/// <summary>
/// Our scanning callback function. We appeal directly to the supporting
/// TWAIN object. This way we don't have to maintain some kind of a loop
/// inside of the application, which is the source of most problems that
/// developers run into.
///
/// While it looks scary at first, there's really not a lot going on in
/// here. We do some sanity checks, we watch for certain kinds of events,
/// we support the four methods of transferring images, and we dump out
/// some meta-data about the transferred image. However, because it does
/// look scary I dropped in some region pragmas to break things up...
/// </summary>
/// <param name="a_blClosing">We're shutting down</param>
/// <returns>TWAIN status</returns>
private TWAIN.STS ScanCallback(bool a_blClosing)
{
bool blXferDone;
TWAINCSToolkit.MSG msgPendingxfers = TWAINCSToolkit.MSG.ENDXFER;
TWAIN.STS sts;
string szFilename = "";
MemoryStream memorystream;
TWAIN.TW_IMAGEINFO twimageinfo = default(TWAIN.TW_IMAGEINFO);
// Validate...
if (m_twain == null)
{
Log.Error("m_twain is null...");
if (ReportImage != null) ReportImage("ScanCallback: 001", "", "", "", CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.FAILURE);
}
// We're leaving...
if (a_blClosing)
{
if (ReportImage != null) ReportImage("ScanCallback: 002", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.IDENTITY.ToString(), TWAIN.MSG.CLOSEDS.ToString(), CvtSts(TWAIN.STS.SUCCESS), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Somebody pushed the Cancel or the OK button...
if (m_twain.IsMsgCloseDsReq())
{
m_twain.Rollback(TWAIN.STATE.S4);
ReportImage("ScanCallback: 003", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.NULL.ToString(), TWAIN.MSG.CLOSEDSREQ.ToString(), CvtSts(TWAIN.STS.SUCCESS), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
else if (m_twain.IsMsgCloseDsOk())
{
m_twain.Rollback(TWAIN.STATE.S4);
ReportImage("ScanCallback: 004", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.NULL.ToString(), TWAIN.MSG.CLOSEDSOK.ToString(), CvtSts(TWAIN.STS.SUCCESS), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Init ourselves...
if (m_blScanStart)
{
TWAIN.TW_CAPABILITY twcapability;
// Don't come in here again until the start of the next scan batch...
m_blScanStart = false;
// Make a note of it...
WriteOutput(Environment.NewLine + "Entered state 5..." + Environment.NewLine);
// Get the current setting for the image transfer...
twcapability = default(TWAIN.TW_CAPABILITY);
twcapability.Cap = TWAIN.CAP.ICAP_XFERMECH;
sts = m_twain.DatCapability(TWAIN.DG.CONTROL, TWAIN.MSG.GETCURRENT, ref twcapability);
if (sts == TWAIN.STS.SUCCESS)
{
try
{
string[] asz = m_twain.CapabilityToCsv(twcapability).Split(new char[] { ',' });
m_twain.DsmMemFree(ref twcapability.hContainer);
m_twsxXferMech = (TWAIN.TWSX)ushort.Parse(asz[3]);
}
catch
{
m_twsxXferMech = TWAIN.TWSX.NATIVE;
}
}
else
{
m_twsxXferMech = TWAIN.TWSX.NATIVE;
}
}
// We're waiting for that first image to show up, if we don't
// see it, then return...
if (!m_twain.IsMsgXferReady())
{
// If we're on Windows we need to send event requests to the driver...
if (TWAIN.GetPlatform() == TWAIN.Platform.WINDOWS)
{
TWAIN.TW_EVENT twevent = default(TWAIN.TW_EVENT);
twevent.pEvent = Marshal.AllocHGlobal(256); // over allocate for MSG structure
if (twevent.pEvent != IntPtr.Zero)
{
m_twain.DatEvent(TWAIN.DG.CONTROL, TWAIN.MSG.PROCESSEVENT, ref twevent);
Marshal.FreeHGlobal(twevent.pEvent);
}
}
// Scoot...
return (TWAIN.STS.SUCCESS);
}
// Transfer the image, at this point we're showing it on the form. The
// application should queue this to some other thread or process as fast
// as possible, so that we can get to the next image.
//
// This is the point where TWAIN tells us about things like jams and
// multifeeds.
// Init some more stuff...
blXferDone = false;
///////////////////////////////////////////////////////////////////////////////
//
// Beginning of the image transfer section...
//
// A native transfer gives us a handle to a DIB, which is not
// quite what we need to fill in a Bitmap in C#, so there's
// some work going on under the hood that requires both processing
// power and memory that may not make this the best choice.
// However, all drivers support native, and the format is reasonably
// easy to process...
#region TWAIN.TWSX.NATIVE
if (m_twsxXferMech == TWAIN.TWSX.NATIVE)
{
Bitmap bitmap = null;
sts = m_twain.DatImagenativexfer(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref bitmap);
if (sts != TWAIN.STS.XFERDONE)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 005", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGENATIVEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
else
{
msgPendingxfers = ReportImage("ScanCallback: 006", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGENATIVEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, null, null, null, 0);
bitmap = null;
blXferDone = true;
}
}
#endregion
// File transfers are not supported by all TWAIN drivers (it's an
// optional transfer format in the TWAIN Specification)...
#region TWAIN.TWSX.FILE
else if (m_twsxXferMech == TWAIN.TWSX.FILE)
{
Bitmap bitmap;
TWAIN.TW_SETUPFILEXFER twsetupfilexfer = default(TWAIN.TW_SETUPFILEXFER);
// Get a copy of the current setup file transfer info...
twsetupfilexfer = m_twsetupfilexfer;
// ***WARNING***
// Override the current setting with one that supports the pixeltype and
// compression of the current image. The choices are JPEG or TIFF. Note
// that this only works for drivers that report final value in state 6...
if (m_blAutomaticJpegOrTiff)
{
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 007", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEINFO.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Assume TIFF, unless we detect JPEG (JFIF)...
twsetupfilexfer.Format = TWAIN.TWFF.TIFF;
if (twimageinfo.Compression == (ushort)TWAIN.TWCP.JPEG)
{
twsetupfilexfer.Format = TWAIN.TWFF.JFIF;
}
}
// If specified, m_szImagePath wins over DAT_SETUPFILEXFER...
string szFile = m_twsetupfilexfer.FileName.Get();
if ((m_szImagePath != null) && (m_szImagePath != ""))
{
szFile = m_szImagePath;
}
// Build the base...
szFile = System.IO.Path.Combine(szFile, m_iImageXferCount.ToString("D6"));
// Add the image transfer count and the extension...
switch (twsetupfilexfer.Format)
{
default: twsetupfilexfer.FileName.Set(szFile + ".xxx"); break;
case TWAIN.TWFF.BMP: twsetupfilexfer.FileName.Set(szFile + ".bmp"); break;
case TWAIN.TWFF.DEJAVU: twsetupfilexfer.FileName.Set(szFile + ".dejavu"); break;
case TWAIN.TWFF.EXIF: twsetupfilexfer.FileName.Set(szFile + ".exif"); break;
case TWAIN.TWFF.FPX: twsetupfilexfer.FileName.Set(szFile + ".fpx"); break;
case TWAIN.TWFF.JFIF: twsetupfilexfer.FileName.Set(szFile + ".jpg"); break;
case TWAIN.TWFF.JP2: twsetupfilexfer.FileName.Set(szFile + ".jp2"); break;
case TWAIN.TWFF.JPX: twsetupfilexfer.FileName.Set(szFile + ".jpx"); break;
case TWAIN.TWFF.PDF: twsetupfilexfer.FileName.Set(szFile + ".pdf"); break;
case TWAIN.TWFF.PDFA: twsetupfilexfer.FileName.Set(szFile + ".pdf"); break;
case TWAIN.TWFF.PICT: twsetupfilexfer.FileName.Set(szFile + ".pict"); break;
case TWAIN.TWFF.PNG: twsetupfilexfer.FileName.Set(szFile + ".png"); break;
case TWAIN.TWFF.SPIFF: twsetupfilexfer.FileName.Set(szFile + ".spiff"); break;
case TWAIN.TWFF.TIFF: twsetupfilexfer.FileName.Set(szFile + ".tif"); break;
case TWAIN.TWFF.TIFFMULTI: twsetupfilexfer.FileName.Set(szFile + ".tif"); break;
case TWAIN.TWFF.XBM: twsetupfilexfer.FileName.Set(szFile + ".xbm"); break;
}
// Setup the file transfer...
sts = m_twain.DatSetupfilexfer(TWAIN.DG.CONTROL, TWAIN.MSG.SET, ref twsetupfilexfer);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 008", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.SETUPFILEXFER.ToString(), TWAIN.MSG.SET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Transfer the image...
sts = m_twain.DatImagefilexfer(TWAIN.DG.IMAGE, TWAIN.MSG.GET);
if (sts != TWAIN.STS.XFERDONE)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 009", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
else
{
try
{
szFilename = twsetupfilexfer.FileName.Get();
Image image = Image.FromFile(szFilename);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
msgPendingxfers = ReportImage("ScanCallback: 010", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, szFilename, m_twain.ImageinfoToCsv(twimageinfo), null, 0);
bitmap = null;
blXferDone = true;
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 011", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, szFilename, m_twain.ImageinfoToCsv(twimageinfo), null, 0);
return (TWAIN.STS.SUCCESS);
}
}
}
#endregion
// Memory transfers are supported by all TWAIN drivers, and offer
// the fastest and most efficient way of moving image data from
// the scanner into the application. However, the data format may
// be nothing more than a stream of compressed raster data, which
// is impossible to interpret until the meta-data is collected
// using DAT_IMAGEINFO or DAT_EXTIMAGEINFO. And under TWAIN the
// meta-data cannot be collected until after the image data is
// fully transferred, so under C# we have some challenges...
//
// And because there's a lot going on in here I've tossed in some
// more region pragmas to break it up...
#region TWAIN.TWSX.MEMORY
else if (m_twsxXferMech == TWAIN.TWSX.MEMORY)
{
Bitmap bitmap;
byte[] abImage = null;
IntPtr intptrTotalAllocated;
IntPtr intptrTotalXfer;
IntPtr intptrOffset;
TWAIN.TW_SETUPMEMXFER twsetupmemxfer = default(TWAIN.TW_SETUPMEMXFER);
TWAIN.TW_IMAGEMEMXFER twimagememxfer = default(TWAIN.TW_IMAGEMEMXFER);
TWAIN.TW_MEMORY twmemory = default(TWAIN.TW_MEMORY);
const int iSpaceForHeader = 512;
// Get the preferred transfer size from the driver...
sts = m_twain.DatSetupmemxfer(TWAIN.DG.CONTROL, TWAIN.MSG.GET, ref twsetupmemxfer);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 012", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.SETUPMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Allocate our unmanaged memory...
twmemory.Flags = (uint)TWAIN.TWMF.APPOWNS | (uint)TWAIN.TWMF.POINTER;
twmemory.Length = twsetupmemxfer.Preferred;
twmemory.TheMem = Marshal.AllocHGlobal((int)twsetupmemxfer.Preferred);
if (twmemory.TheMem == IntPtr.Zero)
{
sts = TWAIN.STS.LOWMEMORY;
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 013", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Loop through all the strips of data, at the end of this the byte
// array abImage has all of the data that we got from the scanner...
#region Tranfer the image from the driver...
intptrTotalAllocated = (IntPtr)iSpaceForHeader;
intptrOffset = (IntPtr)iSpaceForHeader;
intptrTotalXfer = IntPtr.Zero;
sts = TWAIN.STS.SUCCESS;
while (sts == TWAIN.STS.SUCCESS)
{
byte[] abTmp;
// Append the new data to the end of the data we've transferred so far...
intptrOffset = (IntPtr)((int)iSpaceForHeader + (int)intptrTotalXfer);
// Get a strip of image data...
twimagememxfer.Memory.Flags = twmemory.Flags;
twimagememxfer.Memory.Length = twmemory.Length;
twimagememxfer.Memory.TheMem = twmemory.TheMem;
sts = m_twain.DatImagememxfer(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimagememxfer);
if (sts == TWAIN.STS.XFERDONE)
{
intptrTotalXfer = (IntPtr)((UInt64)intptrTotalXfer + (UInt64)twimagememxfer.BytesWritten);
}
else if (sts == TWAIN.STS.SUCCESS)
{
intptrTotalXfer = (IntPtr)((UInt64)intptrTotalXfer + (UInt64)twimagememxfer.BytesWritten);
}
else
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 014", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Allocate memory for our new strip...
intptrTotalAllocated = (IntPtr)((UInt64)intptrTotalAllocated + (UInt64)twimagememxfer.BytesWritten);
abTmp = new byte[(int)intptrTotalAllocated];
if (abTmp == null)
{
sts = TWAIN.STS.LOWMEMORY;
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 015", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Copy the existing data, if we have it...
if (abImage != null)
{
Buffer.BlockCopy(abImage, 0, abTmp, 0, (int)intptrTotalAllocated - (int)twimagememxfer.BytesWritten);
}
// Switch pointers...
abImage = abTmp;
abTmp = null;
// Copy the new strip into place...
Marshal.Copy(twimagememxfer.Memory.TheMem, abImage, (int)intptrOffset, (int)twimagememxfer.BytesWritten);
}
#endregion
// Increment our counter...
m_iImageCount += 1;
// Do this if the data is JPEG compressed...
#region JPEG Images (grayscale and color)...
if ((TWAIN.TWCP)twimagememxfer.Compression == TWAIN.TWCP.JPEG)
{
string szFile = "";
try
{
// Write the data to disk...
if ((m_szImagePath != null) && Directory.Exists(m_szImagePath))
{
// Save the image...
szFile = Path.Combine(m_szImagePath, "img" + m_iImageCount.ToString("D6") + ".jpg");
using (FileStream filestream = new FileStream(szFile, FileMode.Create, FileAccess.Write))
{
filestream.Write(abImage, iSpaceForHeader, abImage.Length - iSpaceForHeader);
}
// Show the image from disk...
Image image = Image.FromFile(szFile);
Bitmap bitmapFile = new Bitmap(image);
image.Dispose();
image = null;
msgPendingxfers = ReportImage("ScanCallback: 016", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.XFERDONE), bitmapFile, szFile, null, abImage, iSpaceForHeader);
blXferDone = true;
}
// Display the image from memory...
else
{
// Turn the data into a bitmap...
memorystream = new MemoryStream(abImage, iSpaceForHeader, abImage.Length - iSpaceForHeader);
Image image = Image.FromStream(memorystream);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
msgPendingxfers = ReportImage("ScanCallback: 017", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, null, null, abImage, iSpaceForHeader);
bitmap = null;
memorystream = null;
blXferDone = true;
}
}
catch
{
WriteOutput("Unable to save image to disk <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 018", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
#endregion
// Do this if the data is GROUP4 compressed, the way to add support for
// this is to create a bitonal TIFF header, place it in a memory stream
// along with the data, and then let .NET decode it...
#region Group4 Images (black and white images)...
else if ((TWAIN.TWCP)twimagememxfer.Compression == TWAIN.TWCP.GROUP4)
{
IntPtr intptrTiff;
TiffBitonalG4 tiffbitonalg4;
string szFile = "";
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 019", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEINFO.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Create a TIFF header...
tiffbitonalg4 = new TiffBitonalG4((uint)twimageinfo.ImageWidth, (uint)twimageinfo.ImageLength, (uint)twimageinfo.XResolution.Whole, (uint)intptrTotalXfer);
// Create memory for the TIFF header...
intptrTiff = Marshal.AllocHGlobal(Marshal.SizeOf(tiffbitonalg4));
// Copy the header into the memory...
Marshal.StructureToPtr(tiffbitonalg4, intptrTiff, true);
// Copy the memory into the byte array (we left room for it), giving us a
// TIFF image starting at (iSpaceForHeader - Marshal.SizeOf(tiffbitonal))
// in the byte array...
Marshal.Copy(intptrTiff, abImage, iSpaceForHeader - Marshal.SizeOf(tiffbitonalg4), Marshal.SizeOf(tiffbitonalg4));
// Create a TIFF image and load it...
try
{
bool blDeleteWhenDone = false;
string szImagePath = m_szImagePath;
// We don't have a valid user supplied folder, so use the temp
// directory...
if ((m_szImagePath == null) || !Directory.Exists(m_szImagePath))
{
blDeleteWhenDone = true;
szImagePath = Path.GetTempPath();
}
// Write the image to disk...
try
{
szFile = Path.Combine(szImagePath, "img" + m_iImageCount.ToString("D6") + ".tif");
using (FileStream filestream = new FileStream(szFile, FileMode.Create, FileAccess.Write))
{
filestream.Write
(
abImage,
iSpaceForHeader - Marshal.SizeOf(tiffbitonalg4),
abImage.Length - (iSpaceForHeader - Marshal.SizeOf(tiffbitonalg4))
);
}
}
catch
{
WriteOutput("Unable to save image to disk <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 020", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Free the memory...
Marshal.FreeHGlobal(intptrTiff);
intptrTiff = IntPtr.Zero;
// Build the bitmap from disk (to reduce our memory footprint)...
Image image = Image.FromFile(szFile);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
// Send it off to the application...
msgPendingxfers = ReportImage("ScanCallback: 021", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, szFile, m_twain.ImageinfoToCsv(twimageinfo), abImage, iSpaceForHeader);
// Delete it if it's temp...
if (blDeleteWhenDone)
{
try
{
File.Delete(szFile);
}
catch
{
WriteOutput("Failed to delete temporary image file <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 022", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 023", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
#endregion
// We have no compression, we need to handle the data one raster or
// one pixel at a time to make sure we get the alignment right, and that
// means doing different stuff for black and white vs gray vs color...
#region Uncompressed images (all pixel types)...
else if ((TWAIN.TWCP)twimagememxfer.Compression == TWAIN.TWCP.NONE)
{
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 024", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEINFO.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Handle uncompressed bitonal images...
#region Handle uncompressed bitonal images...
if (twimageinfo.BitsPerPixel == 1)
{
try
{
IntPtr intptrTiff;
TiffBitonalUncompressed tiffbitonaluncompressed;
string szFile = "";
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 025", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Create a TIFF header...
tiffbitonaluncompressed = new TiffBitonalUncompressed((uint)twimageinfo.ImageWidth, (uint)twimageinfo.ImageLength, (uint)twimageinfo.XResolution.Whole, (uint)intptrTotalXfer);
// Create memory for the TIFF header...
intptrTiff = Marshal.AllocHGlobal(Marshal.SizeOf(tiffbitonaluncompressed));
// Copy the header into the memory...
Marshal.StructureToPtr(tiffbitonaluncompressed, intptrTiff, true);
// Copy the memory into the byte array (we left room for it), giving us a
// TIFF image starting at (iSpaceForHeader - Marshal.SizeOf(tiffbitonal))
// in the byte array...
Marshal.Copy(intptrTiff, abImage, iSpaceForHeader - Marshal.SizeOf(tiffbitonaluncompressed), Marshal.SizeOf(tiffbitonaluncompressed));
// Create a TIFF image and load it...
try
{
bool blDeleteWhenDone = false;
string szImagePath = m_szImagePath;
// We don't have a valid user supplied folder, so use the temp
// directory...
if ((m_szImagePath == null) || !Directory.Exists(m_szImagePath))
{
blDeleteWhenDone = true;
szImagePath = Path.GetTempPath();
}
// Write the image to disk...
try
{
szFile = Path.Combine(szImagePath, "img" + m_iImageCount.ToString("D6") + ".tif");
using (FileStream filestream = new FileStream(szFile, FileMode.Create, FileAccess.Write))
{
filestream.Write
(
abImage,
iSpaceForHeader - Marshal.SizeOf(tiffbitonaluncompressed),
abImage.Length - (iSpaceForHeader - Marshal.SizeOf(tiffbitonaluncompressed))
);
}
}
catch
{
WriteOutput("Unable to save image to disk <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 026", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Free the memory...
Marshal.FreeHGlobal(intptrTiff);
intptrTiff = IntPtr.Zero;
// Build the bitmap from the file, make sure we discard the image so the file isn't locked...
Image image = Image.FromFile(szFile);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
// Send the stuff to the application...
ReportImage("ScanCallback: 027", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, szFile, m_twain.ImageinfoToCsv(twimageinfo), abImage, iSpaceForHeader);
// Delete it if it's temp...
if (blDeleteWhenDone)
{
try
{
File.Delete(szFile);
}
catch
{
WriteOutput("Failed to delete temporary image file <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 028", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Cleanup...
bitmap = null;
memorystream = null;
blXferDone = true;
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 029", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 030", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
#endregion
// Handle uncompressed color images...
#region Handle uncompressed color images...
else if (twimageinfo.BitsPerPixel == 24)
{
try
{
IntPtr intptrTiff;
TiffColorUncompressed tiffcoloruncompressed;
string szFile = "";
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 031", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Create a TIFF header...
tiffcoloruncompressed = new TiffColorUncompressed((uint)twimageinfo.ImageWidth, (uint)twimageinfo.ImageLength, (uint)twimageinfo.XResolution.Whole, (uint)intptrTotalXfer);
// Create memory for the TIFF header...
intptrTiff = Marshal.AllocHGlobal(Marshal.SizeOf(tiffcoloruncompressed));
// Copy the header into the memory...
Marshal.StructureToPtr(tiffcoloruncompressed, intptrTiff, true);
// Copy the memory into the byte array (we left room for it), giving us a
// TIFF image starting at (iSpaceForHeader - Marshal.SizeOf(tiffbitonal))
// in the byte array...
Marshal.Copy(intptrTiff, abImage, iSpaceForHeader - Marshal.SizeOf(tiffcoloruncompressed), Marshal.SizeOf(tiffcoloruncompressed));
// Create a TIFF image and load it...
try
{
bool blDeleteWhenDone = false;
string szImagePath = m_szImagePath;
// We don't have a valid user supplied folder, so use the temp
// directory...
if ((m_szImagePath == null) || !Directory.Exists(m_szImagePath))
{
blDeleteWhenDone = true;
szImagePath = Path.GetTempPath();
}
// Write the image to disk...
try
{
szFile = Path.Combine(szImagePath, "img" + m_iImageCount.ToString("D6") + ".tif");
using (FileStream filestream = new FileStream(szFile, FileMode.Create, FileAccess.Write))
{
filestream.Write
(
abImage,
iSpaceForHeader - Marshal.SizeOf(tiffcoloruncompressed),
abImage.Length - (iSpaceForHeader - Marshal.SizeOf(tiffcoloruncompressed))
);
}
}
catch
{
WriteOutput("Unable to save image to disk <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 032", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Free the memory...
Marshal.FreeHGlobal(intptrTiff);
intptrTiff = IntPtr.Zero;
// Build the bitmap from the file, make sure we discard the image so the file isn't locked...
Image image = Image.FromFile(szFile);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
// Send the stuff to the application...
ReportImage("ScanCallback: 033", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, szFile, m_twain.ImageinfoToCsv(twimageinfo), abImage, iSpaceForHeader);
// Delete it if it's temp...
if (blDeleteWhenDone)
{
try
{
File.Delete(szFile);
}
catch
{
WriteOutput("Failed to delete temporary image file <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 034", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Cleanup...
bitmap = null;
memorystream = null;
blXferDone = true;
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 035", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 036", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
#endregion
// Handle uncompressed grayscale images...
#region Handle uncompressed grayscale images...
else if (twimageinfo.BitsPerPixel == 8)
{
try
{
IntPtr intptrTiff;
TiffGrayscaleUncompressed tiffgrayscaleuncompressed;
string szFile = "";
// We need the image info for this one...
if (twimageinfo.BitsPerPixel == 0)
{
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 037", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Create a TIFF header...
tiffgrayscaleuncompressed = new TiffGrayscaleUncompressed((uint)twimageinfo.ImageWidth, (uint)twimageinfo.ImageLength, (uint)twimageinfo.XResolution.Whole, (uint)intptrTotalXfer);
// Create memory for the TIFF header...
intptrTiff = Marshal.AllocHGlobal(Marshal.SizeOf(tiffgrayscaleuncompressed));
// Copy the header into the memory...
Marshal.StructureToPtr(tiffgrayscaleuncompressed, intptrTiff, true);
// Copy the memory into the byte array (we left room for it), giving us a
// TIFF image starting at (iSpaceForHeader - Marshal.SizeOf(tiffbitonal))
// in the byte array...
Marshal.Copy(intptrTiff, abImage, iSpaceForHeader - Marshal.SizeOf(tiffgrayscaleuncompressed), Marshal.SizeOf(tiffgrayscaleuncompressed));
// Create a TIFF image and load it...
try
{
bool blDeleteWhenDone = false;
string szImagePath = m_szImagePath;
// We don't have a valid user supplied folder, so use the temp
// directory...
if ((m_szImagePath == null) || !Directory.Exists(m_szImagePath))
{
blDeleteWhenDone = true;
szImagePath = Path.GetTempPath();
}
// Write the image to disk...
try
{
szFile = Path.Combine(szImagePath, "img" + m_iImageCount.ToString("D6") + ".tif");
using (FileStream filestream = new FileStream(szFile, FileMode.Create, FileAccess.Write))
{
filestream.Write
(
abImage,
iSpaceForHeader - Marshal.SizeOf(tiffgrayscaleuncompressed),
abImage.Length - (iSpaceForHeader - Marshal.SizeOf(tiffgrayscaleuncompressed))
);
}
}
catch
{
WriteOutput("Unable to save image to disk <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 038", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Free the memory...
Marshal.FreeHGlobal(intptrTiff);
intptrTiff = IntPtr.Zero;
// Build the bitmap from the file, make sure we discard the image so the file isn't locked...
Image image = Image.FromFile(szFile);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
// Send the stuff to the application...
ReportImage("ScanCallback: 039", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, szFile, m_twain.ImageinfoToCsv(twimageinfo), abImage, iSpaceForHeader);
// Delete it if it's temp...
if (blDeleteWhenDone)
{
try
{
File.Delete(szFile);
}
catch
{
WriteOutput("Failed to delete temporary image file <" + szFile + ">" + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 040", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FILEWRITEERROR), null, szFile, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
// Cleanup...
bitmap = null;
memorystream = null;
blXferDone = true;
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 041", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 042", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
#endregion
// Uh-oh...
#region Uh-oh...
else
{
WriteOutput("Scanning error: unsupported pixeltype..." + Environment.NewLine);
m_iImageCount -= 1;
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 043", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
#endregion
}
#endregion
// Uh-oh...
#region Uh-oh
else
{
WriteOutput("Scanning error: unsupported compression..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 044", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
#endregion
}
#endregion
// Memory file transfers combine the best of file transfers and
// memory transgers, however at this time it's not clear that any
// TWAIN drivers have ever supported it...
#region TWAIN.TWSX.MEMFILE
else if (m_twsxXferMech == TWAIN.TWSX.MEMFILE)
{
Bitmap bitmap;
byte[] abImage = null;
IntPtr intptrTotalAllocated;
IntPtr intptrTotalXfer;
IntPtr intptrOffset;
TWAIN.TW_SETUPMEMXFER twsetupmemxfer = default(TWAIN.TW_SETUPMEMXFER);
TWAIN.TW_IMAGEMEMXFER twimagememxfer = default(TWAIN.TW_IMAGEMEMXFER);
// Get the preferred transfer size from the driver...
sts = m_twain.DatSetupmemxfer(TWAIN.DG.CONTROL, TWAIN.MSG.GET, ref twsetupmemxfer);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 045", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.SETUPMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Allocate our unmanaged memory...
twimagememxfer.Memory.Flags = (uint)TWAIN.TWMF.APPOWNS | (uint)TWAIN.TWMF.POINTER;
twimagememxfer.Memory.Length = twsetupmemxfer.Preferred;
twimagememxfer.Memory.TheMem = Marshal.AllocHGlobal((int)twsetupmemxfer.Preferred);
if (twimagememxfer.Memory.TheMem == IntPtr.Zero)
{
sts = TWAIN.STS.LOWMEMORY;
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 046", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Loop through all the strips of data...
intptrTotalAllocated = IntPtr.Zero;
intptrTotalXfer = IntPtr.Zero;
sts = TWAIN.STS.SUCCESS;
while (sts == TWAIN.STS.SUCCESS)
{
byte[] abTmp;
// Append the new data to the end of the data we've transferred so far...
intptrOffset = (IntPtr)intptrTotalXfer;
// Get a strip of image data...
sts = m_twain.DatImagememfilexfer(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimagememxfer);
if (sts == TWAIN.STS.XFERDONE)
{
intptrTotalXfer = (IntPtr)((UInt64)intptrTotalXfer + (UInt64)twimagememxfer.BytesWritten);
}
else if (sts == TWAIN.STS.SUCCESS)
{
intptrTotalXfer = (IntPtr)((UInt64)intptrTotalXfer + (UInt64)twimagememxfer.BytesWritten);
}
else
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 047", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Allocate memory for our new strip...
intptrTotalAllocated = (IntPtr)((UInt64)intptrTotalAllocated + (UInt64)twimagememxfer.BytesWritten);
abTmp = new byte[(int)intptrTotalAllocated];
if (abTmp == null)
{
sts = TWAIN.STS.LOWMEMORY;
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 048", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// Copy the existing data, if we have it...
if (abImage != null)
{
Buffer.BlockCopy(abImage, 0, abTmp, 0, (int)intptrTotalAllocated - (int)twimagememxfer.BytesWritten);
}
// Switch pointers...
abImage = abTmp;
abTmp = null;
// Copy the new strip into place...
Marshal.Copy(twimagememxfer.Memory.TheMem, abImage, (int)intptrOffset, (int)twimagememxfer.BytesWritten);
}
// Okay, turn the data into a bitmap...
memorystream = new MemoryStream(abImage);
try
{
Image image = Image.FromStream(memorystream);
bitmap = new Bitmap(image);
image.Dispose();
image = null;
msgPendingxfers = ReportImage("ScanCallback: 049", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), bitmap, null, null, null, 0);
bitmap = null;
blXferDone = true;
}
catch
{
WriteOutput("Scanning error: unable to load image..." + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 050", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
memorystream = null;
}
#endregion
// Uh-oh...
#region Uh-oh...
else
{
WriteOutput("Scan: unrecognized ICAP_XFERMECH value..." + m_twsxXferMech + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 051", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEMEMFILEXFER.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(TWAIN.STS.FAILURE), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
#endregion
//
// End of the image transfer section...
//
///////////////////////////////////////////////////////////////////////////////
// Give us a blank line...
WriteOutput(Environment.NewLine);
// If we're doing a file tranfer, then output the file we just did...
if (szFilename != "")
{
WriteOutput("File: " + szFilename + Environment.NewLine);
}
// Let's get some meta data. TWAIN only guarantees that this data
// is accurate in state 7 after TWRC_XFERDONE has been received...
if (blXferDone)
{
if (twimageinfo.BitsPerPixel == 0)
{
twimageinfo = default(TWAIN.TW_IMAGEINFO);
sts = m_twain.DatImageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twimageinfo);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("ImageInfo failed: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 052", TWAIN.DG.IMAGE.ToString(), TWAIN.DAT.IMAGEINFO.ToString(), TWAIN.MSG.GET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
}
WriteOutput("ImageInfo: " + m_twain.ImageinfoToCsv(twimageinfo) + Environment.NewLine);
}
// And let's get some more meta data, this time using extended image
// info, which is a little more complex. This is just being done to
// show how to make the call, as a general rule an applications should
// use one or the other, not both...
if (blXferDone)
{
TWAIN.TW_EXTIMAGEINFO twextimageinfo = default(TWAIN.TW_EXTIMAGEINFO);
TWAIN.TW_INFO twinfo = default(TWAIN.TW_INFO);
twextimageinfo.NumInfos = 0;
twinfo.InfoId = (ushort)TWAIN.TWEI.DOCUMENTNUMBER; twextimageinfo.Set(twextimageinfo.NumInfos++, ref twinfo);
twinfo.InfoId = (ushort)TWAIN.TWEI.PAGESIDE; twextimageinfo.Set(twextimageinfo.NumInfos++, ref twinfo);
sts = m_twain.DatExtimageinfo(TWAIN.DG.IMAGE, TWAIN.MSG.GET, ref twextimageinfo);
if (sts == TWAIN.STS.SUCCESS)
{
string szResult = "ExtImageInfo: ";
twextimageinfo.Get(0, ref twinfo);
if (twinfo.ReturnCode == (ushort)TWAIN.STS.SUCCESS)
{
szResult += "DocumentNumber=" + twinfo.Item + " ";
}
twextimageinfo.Get(1, ref twinfo);
if (twinfo.ReturnCode == (ushort)TWAIN.STS.SUCCESS)
{
szResult += "PageSide=" + "TWCS_" + (TWAIN.TWCS)twinfo.Item + " ";
}
WriteOutput(szResult + Environment.NewLine);
}
}
// Increment the image transfer count...
if (blXferDone)
{
m_iImageXferCount += 1;
}
// Tell TWAIN that we're done with this image, this is the one place
// that we go downstate without using the Rollback function, so that
// we can examine the TW_PENDINGXFERS structure...
TWAIN.TW_PENDINGXFERS twpendingxfersEndXfer = default(TWAIN.TW_PENDINGXFERS);
sts = m_twain.DatPendingxfers(TWAIN.DG.CONTROL, TWAIN.MSG.ENDXFER, ref twpendingxfersEndXfer);
if (sts != TWAIN.STS.SUCCESS)
{
WriteOutput("Scanning error: " + sts + Environment.NewLine);
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 053", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.PENDINGXFERS.ToString(), TWAIN.MSG.ENDXFER.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
// We've been asked to do extra work...
switch (msgPendingxfers)
{
// No work needed here...
default:
case TWAINCSToolkit.MSG.ENDXFER:
break;
// Reset, we're exiting from scanning...
case TWAINCSToolkit.MSG.RESET:
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 054", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.PENDINGXFERS.ToString(), TWAIN.MSG.RESET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
// Stop the feeder...
case TWAINCSToolkit.MSG.STOPFEEDER:
TWAIN.TW_PENDINGXFERS twpendingxfersStopFeeder = default(TWAIN.TW_PENDINGXFERS);
sts = m_twain.DatPendingxfers(TWAIN.DG.CONTROL, TWAIN.MSG.STOPFEEDER, ref twpendingxfersStopFeeder);
if (sts != TWAIN.STS.SUCCESS)
{
// If we can't stop gracefully, then just abort...
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 055", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.PENDINGXFERS.ToString(), TWAIN.MSG.RESET.ToString(), CvtSts(sts), null, null, null, null, 0);
return (TWAIN.STS.SUCCESS);
}
break;
}
// If count goes to zero, then the session is complete, and the
// driver goes to state 5, otherwise it goes to state 6 in
// preperation for the next image. We'll also return a value of
// zero if the transfer hits an error, like a paper jam. And then,
// just to keep it interesting, we also need to pay attention to
// whether or not we have a UI running. If we don't, then state 5
// is our target, otherwise we want to go to state 4 (programmatic
// mode)...
if (twpendingxfersEndXfer.Count == 0)
{
WriteOutput(Environment.NewLine + "Scanning done: " + TWAIN.STS.SUCCESS + Environment.NewLine);
// Any attempt to scan will look like a new session to us...
m_blScanStart = true;
// We saved this value for you when MSG_ENABLEDS was called, if the
// UI is up, then goto state 5...
m_twain.Rollback(m_stateAfterScan);
ReportImage("ScanCallback: 056", TWAIN.DG.CONTROL.ToString(), TWAIN.DAT.PENDINGXFERS.ToString(), TWAIN.MSG.RESET.ToString(), CvtSts(sts), null, null, null, null, 0);
}
// All done...
return (TWAIN.STS.SUCCESS);
}
///////////////////////////////////////////////////////////////////////////////
// Public Methods: PdfRaster
///////////////////////////////////////////////////////////////////////////////
#region Public Methods: PdfRaster
/// <summary>
/// Add image header to the image data from a PDF/raster..
/// </summary>
/// <param name="a_abImage">the image data</param>
/// <param name="a_rasterpixelformat">color, grayscale, black and white</param>
/// <param name="a_rastercompression">none. group4, jpeg</param>
/// <param name="a_lResolution">resolution in dots per inch</param>
/// <param name="a_lWidth">width in pixels</param>
/// <param name="a_lHeight">height in pixels</param>
/// <returns>true on success</returns>
public static bool AddImageHeader
(
out byte[] a_abImage,
byte[] a_abStripData,
PdfRasterReader.Reader.PdfRasterReaderPixelFormat a_rasterpixelformat,
PdfRasterReader.Reader.PdfRasterReaderCompression a_rastercompression,
long a_lResolution,
long a_lWidth,
long a_lHeight
)
{
int iCount;
int iHeader;
IntPtr intptr;
TiffBitonalUncompressed tiffbitonaluncompressed;
TiffBitonalG4 tiffbitonalg4;
TiffGrayscaleUncompressed tiffgrayscaleuncompressed;
TiffColorUncompressed tiffcoloruncompressed;
// Init stuff...
a_abImage = null;
// Add a header, if needed...
switch (a_rasterpixelformat)
{
default:
return(false);
case PdfRasterReader.Reader.PdfRasterReaderPixelFormat.PDFRASREAD_BITONAL:
switch (a_rastercompression)
{
default:
return(false);
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASREAD_UNCOMPRESSED:
iCount = (int)(((a_lWidth + 7) / 8) * a_lHeight); //it's packed
tiffbitonaluncompressed = new TiffBitonalUncompressed((uint)a_lWidth, (uint)a_lHeight, (uint)a_lResolution, (uint)iCount);
iHeader = Marshal.SizeOf(tiffbitonaluncompressed);
a_abImage = new byte[iHeader + iCount];
intptr = Marshal.AllocHGlobal(iHeader);
Marshal.StructureToPtr(tiffbitonaluncompressed, intptr, true);
Marshal.Copy(intptr, a_abImage, 0, iHeader);
Marshal.FreeHGlobal(intptr);
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASEARD_CCITTG4:
iCount = a_abStripData.Length;
tiffbitonalg4 = new TiffBitonalG4((uint)a_lWidth, (uint)a_lHeight, (uint)a_lResolution, (uint)iCount);
iHeader = Marshal.SizeOf(tiffbitonalg4);
a_abImage = new byte[iHeader + iCount];
intptr = Marshal.AllocHGlobal(iHeader);
Marshal.StructureToPtr(tiffbitonalg4, intptr, true);
Marshal.Copy(intptr, a_abImage, 0, iHeader);
Marshal.FreeHGlobal(intptr);
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
}
break;
case PdfRasterReader.Reader.PdfRasterReaderPixelFormat.PDFRASREAD_GRAYSCALE:
switch (a_rastercompression)
{
default:
return(false);
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASREAD_UNCOMPRESSED:
iCount = (int)(a_lWidth * a_lHeight);
tiffgrayscaleuncompressed = new TiffGrayscaleUncompressed((uint)a_lWidth, (uint)a_lHeight, (uint)a_lResolution, (uint)iCount);
iHeader = Marshal.SizeOf(tiffgrayscaleuncompressed);
a_abImage = new byte[iHeader + iCount];
intptr = Marshal.AllocHGlobal(iHeader);
Marshal.StructureToPtr(tiffgrayscaleuncompressed, intptr, true);
Marshal.Copy(intptr, a_abImage, 0, iHeader);
Marshal.FreeHGlobal(intptr);
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASREAD_JPEG:
iCount = a_abStripData.Length;
iHeader = 0;
a_abImage = new byte[iCount];
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
}
break;
case PdfRasterReader.Reader.PdfRasterReaderPixelFormat.PDFRASREAD_RGB:
switch (a_rastercompression)
{
default:
return(false);
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASREAD_UNCOMPRESSED:
iCount = (int)((a_lWidth * 3) * a_lHeight * 3);
tiffcoloruncompressed = new TiffColorUncompressed((uint)a_lWidth, (uint)a_lHeight, (uint)a_lResolution, (uint)iCount);
iHeader = Marshal.SizeOf(tiffcoloruncompressed);
a_abImage = new byte[iHeader + iCount];
intptr = Marshal.AllocHGlobal(iHeader);
Marshal.StructureToPtr(tiffcoloruncompressed, intptr, true);
Marshal.Copy(intptr, a_abImage, 0, iHeader);
Marshal.FreeHGlobal(intptr);
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
case PdfRasterReader.Reader.PdfRasterReaderCompression.PDFRASREAD_JPEG:
iCount = a_abStripData.Length;
iHeader = 0;
a_abImage = new byte[iCount];
Buffer.BlockCopy(a_abStripData, 0, a_abImage, iHeader, iCount);
break;
}
break;
}
// All done...
return(true);
}