/// <summary>
/// Use scanner to scan an image (scanner is selected by its unique id).
/// </summary>
/// <param name="scannerName"></param>
/// <returns>Scanned images.</returns>
public static List <Image> Scan(string scannerId, int pages, WIAScanQuality quality, WIAPageSize pageSize, DocumentSource source)
{
List <Image> images = new List <Image>();
bool hasMorePages = true;
int numbrPages = pages;
while (hasMorePages)
{
// select the correct scanner using the provided scannerId parameter
WIA.DeviceManager manager = new WIA.DeviceManager();
WIA.Device device = null;
foreach (WIA.DeviceInfo info in manager.DeviceInfos)
{
if (info.DeviceID == scannerId)
{
// connect to scanner
device = info.Connect();
break;
}
}
// device was not found
if (device == null)
{
// enumerate available devices
string availableDevices = "";
foreach (WIA.DeviceInfo info in manager.DeviceInfos)
{
availableDevices += info.DeviceID + "\n";
}
// show error with available devices
throw new Exception("The device with provided ID could not be found. Available Devices:\n" + availableDevices);
}
SetWIAProperty(device.Properties, WIA_DEVICE_PROPERTY_PAGES_ID, 1);
SetWIAProperty(device.Properties, WIA_DEVICE_SOURCE_SELECT_ID, source);
WIA.Item item = device.Items[1] as WIA.Item;
// adjust the scan settings
int dpi;
int width_pixels;
int height_pixels;
switch (quality)
{
case WIAScanQuality.Final:
dpi = 300;
break;
default:
throw new Exception("Unknown WIAScanQuality: " + quality.ToString());
}
switch (pageSize)
{
case WIAPageSize.A4:
width_pixels = (int)(8.3f * dpi);
height_pixels = (int)(11.7f * dpi);
break;
case WIAPageSize.Letter:
width_pixels = (int)(8.5f * dpi);
height_pixels = (int)(11f * dpi);
break;
case WIAPageSize.Legal:
width_pixels = (int)(8.5f * dpi);
height_pixels = (int)(14f * dpi);
break;
default:
throw new Exception("Unknown WIAPageSize: " + pageSize.ToString());
}
AdjustScannerSettings(item, dpi, 0, 0, width_pixels, height_pixels, 0, 0, 1);
try
{
// scan image
WIA.ICommonDialog wiaCommonDialog = new WIA.CommonDialog();
WIA.ImageFile image = (WIA.ImageFile)wiaCommonDialog.ShowTransfer(item, wiaFormatBMP, false);
// save to temp file
string fileName = Path.GetTempFileName();
File.Delete(fileName);
image.SaveFile(fileName);
image = null;
// add file to output list
images.Add(Image.FromFile(fileName));
}
catch (Exception exc)
{
throw exc;
}
finally
{
item = null;
//determine if there are any more pages waiting
WIA.Property documentHandlingSelect = null;
WIA.Property documentHandlingStatus = null;
foreach (WIA.Property prop in device.Properties)
{
if (prop.PropertyID == WIA_PROPERTIES.WIA_DPS_DOCUMENT_HANDLING_SELECT)
{
documentHandlingSelect = prop;
}
if (prop.PropertyID == WIA_PROPERTIES.WIA_DPS_DOCUMENT_HANDLING_STATUS)
{
documentHandlingStatus = prop;
}
}
// assume there are no more pages
hasMorePages = false;
// may not exist on flatbed scanner but required for feeder
if (documentHandlingSelect != null)
{
// check for document feeder
if ((Convert.ToUInt32(documentHandlingSelect.get_Value()) & WIA_DPS_DOCUMENT_HANDLING_SELECT.FEEDER) != 0)
{
hasMorePages = ((Convert.ToUInt32(documentHandlingStatus.get_Value()) & WIA_DPS_DOCUMENT_HANDLING_STATUS.FEED_READY) != 0);
}
}
}
numbrPages -= 1;
if (numbrPages > 0)
{
hasMorePages = true;
}
else
{
hasMorePages = false;
}
}
return(images);
}
/// <summary>
///
/// </summary>
/// <param name="item"></param>
/// <param name="resolucaoDPI"></param>
/// <param name="pixelInicialEsquerdo"></param>
/// <param name="pixelInicialInicio"></param>
/// <param name="larguraPixel"></param>
/// <param name="alturaPixel"></param>
/// <param name="percentualBrilho"></param>
/// <param name="percentualContraste"></param>
/// <param name="modoCor"></param>
private static void AjustaPropriedadesDispositivo(IItem item, int pixelInicialEsquerdo, int pixelInicialInicio,
int percentualBrilho, int percentualContraste, int modoCor, WIAScanQuality qualidade, WIAPageSize tamanho)
{
const string WIA_SCAN_COLOR_MODE = "6146";
const string WIA_HORIZONTAL_SCAN_RESOLUTION_DPI = "6147";
const string WIA_VERTICAL_SCAN_RESOLUTION_DPI = "6148";
const string WIA_HORIZONTAL_SCAN_START_PIXEL = "6149";
const string WIA_VERTICAL_SCAN_START_PIXEL = "6150";
const string WIA_HORIZONTAL_SCAN_SIZE_PIXELS = "6151";
const string WIA_VERTICAL_SCAN_SIZE_PIXELS = "6152";
const string WIA_SCAN_BRIGHTNESS_PERCENTS = "6154";
const string WIA_SCAN_CONTRAST_PERCENTS = "6155";
// adjust the scan settings
int resolucaoDPI;
int larguraPixel;
int alturaPixel;
switch (qualidade)
{
case WIAScanQuality.Preview:
resolucaoDPI = 100;
break;
case WIAScanQuality.Final:
resolucaoDPI = 100;
break;
default:
throw new Exception("Qualidade da imagem inválida: " + qualidade.ToString());
}
switch (tamanho)
{
case WIAPageSize.A4:
larguraPixel = (int)(8.3f * resolucaoDPI);
alturaPixel = (int)(11f * resolucaoDPI);
break;
case WIAPageSize.Letter:
larguraPixel = (int)(8.5f * resolucaoDPI);
alturaPixel = (int)(11f * resolucaoDPI);
break;
case WIAPageSize.Legal:
larguraPixel = (int)(8.5f * resolucaoDPI);
alturaPixel = (int)(11f * resolucaoDPI);
break;
default:
throw new Exception("Tamanho da página inválido: " + tamanho.ToString());
}
GravaPropriedadeWIA(item.Properties, WIA_HORIZONTAL_SCAN_RESOLUTION_DPI, resolucaoDPI);
GravaPropriedadeWIA(item.Properties, WIA_VERTICAL_SCAN_RESOLUTION_DPI, resolucaoDPI);
GravaPropriedadeWIA(item.Properties, WIA_HORIZONTAL_SCAN_START_PIXEL, pixelInicialEsquerdo);
GravaPropriedadeWIA(item.Properties, WIA_VERTICAL_SCAN_START_PIXEL, pixelInicialInicio);
GravaPropriedadeWIA(item.Properties, WIA_HORIZONTAL_SCAN_SIZE_PIXELS, larguraPixel);
GravaPropriedadeWIA(item.Properties, WIA_VERTICAL_SCAN_SIZE_PIXELS, alturaPixel);
GravaPropriedadeWIA(item.Properties, WIA_SCAN_BRIGHTNESS_PERCENTS, percentualBrilho);
GravaPropriedadeWIA(item.Properties, WIA_SCAN_CONTRAST_PERCENTS, percentualContraste);
GravaPropriedadeWIA(item.Properties, WIA_SCAN_COLOR_MODE, modoCor);
}