public Scaner()
{
InitializeComponent();
tw = new Twain();
tw.Init(this.Handle);
}
public void ScanEnd()
{
if (tw != null)
{
EndingScan();
tw.CloseSrc();
tw = null;
}
}
public TwCapability(TwCap cap, short sval)
{
Cap = (short)cap;
ConType = (short)TwOn.One;
Handle = Twain.GlobalAlloc(0x42, 6);
IntPtr pv = Twain.GlobalLock(Handle);
Marshal.WriteInt16(pv, 0, (short)TwType.Int16);
Marshal.WriteInt32(pv, 2, sval);
Twain.GlobalUnlock(Handle);
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose(bool disposing)
{
Application.RemoveMessageFilter(this);
if (tw != null)
{
tw.CloseSrc();
tw = null;
}
if (disposing)
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose(disposing);
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_CREATE)
{
if (tw == null)
{
tw = new Twain();
tw.Init(this.Handle);
}
else
{
tw.Init(this.Handle);
}
}
base.WndProc(ref m);
}
bool IMessageFilter.PreFilterMessage(ref Message m)
{
if (m.HWnd != this.Handle)
{
return(false);
}
TwainCommand cmd = tw.PassMessage(ref m);
if (cmd == TwainCommand.Not)
{
return(false);
}
switch (cmd)
{
case TwainCommand.Failure:
case TwainCommand.CloseRequest:
case TwainCommand.CloseOk:
{
EndingScan();
tw.CloseSrc();
OnDialogClose(currentScanType, callback);
break;
}
case TwainCommand.DeviceEvent:
{
break;
}
case TwainCommand.TransferReady:
{
ArrayList pics = tw.TransferPictures();
EndingScan();
tw.CloseSrc();
if (pics != null)
{
List <Bitmap> bitmaps = new List <Bitmap>();
for (int n = 0; n < pics.Count; n++)
{
IntPtr img = (IntPtr)pics[n];
try
{
IntPtr bmpptr = Twain.GlobalLock(img);
Bitmap b = null;
try
{
b = DibToImage.WithScan0(bmpptr);
}
catch { }
if (b != null)
{
bitmaps.Add(b);
}
}
catch (Exception ex)
{
Tiff.LibTiffHelper.WriteToLog(ex);
}
finally
{
Twain.GlobalFree(img);
}
pics[n] = null;
}
if (bitmaps.Count > 0)
{
OnImagesReceived(bitmaps, currentScanType, callback);
}
}
break;
}
}
return(true);
}
