// Return the lowest supported bitmap that is at least the target bitmap
private TwainResolution FindBestResolution(TwainResolution[] resolutions, int targetResolution)
{
float diff = int.MaxValue;
TwainResolution selectedResolution = null;
foreach (TwainResolution resolution in resolutions)
{
if (resolution.X >= targetResolution && (resolution.X - targetResolution) < diff)
{
diff = resolution.X - targetResolution;
selectedResolution = resolution;
}
}
return(selectedResolution);
}
private void ScanDocument()
{
this.Cursor = Cursors.WaitCursor;
if (device.TryOpen())
{
try
{
DocumentType docType = ((myDocType)getCheckedMenuItem(miDocumentType).Tag).DocType;
DeviceCapability[] capabilities = device.GetSupportedCapabilities();
foreach (DeviceCapability capability in capabilities)
{
switch (capability)
{
case DeviceCapability.ICAP_PIXELTYPE:
if (docType.PreferredColorDepth != Arena.Enums.ColorDepth.Undefined)
{
ImagePixelType[] pixelTypes = device.GetSupportedPixelTypes();
switch (docType.PreferredColorDepth)
{
case Arena.Enums.ColorDepth.Color_4_bit:
case Arena.Enums.ColorDepth.Color_8_bit:
case Arena.Enums.ColorDepth.Color_24_bit:
case Arena.Enums.ColorDepth.Color_32_bit:
case Arena.Enums.ColorDepth.Color_48_bit:
foreach (ImagePixelType pixelType in pixelTypes)
{
if (pixelType == ImagePixelType.Color)
{
device.PixelType = pixelType;
break;
}
}
break;
case Arena.Enums.ColorDepth.Grayscale_8_bit:
case Arena.Enums.ColorDepth.Grayscale_10_bit:
case Arena.Enums.ColorDepth.Grayscale_24_bit:
foreach (ImagePixelType pixelType in pixelTypes)
{
if (pixelType == ImagePixelType.Grayscale)
{
device.PixelType = pixelType;
break;
}
}
break;
case Arena.Enums.ColorDepth.Black_White:
foreach (ImagePixelType pixelType in pixelTypes)
{
if (pixelType == ImagePixelType.BlackAndWhite)
{
device.PixelType = pixelType;
break;
}
}
break;
}
}
break;
case DeviceCapability.ICAP_BITDEPTH:
if (docType.PreferredColorDepth != Arena.Enums.ColorDepth.Undefined)
{
int[] bitDepths = device.GetSupportedBitDepths();
int selectedBithDepth = 0;
switch (docType.PreferredColorDepth)
{
case Arena.Enums.ColorDepth.Black_White:
selectedBithDepth = FindBestBitDepth(bitDepths, 1);
break;
case Arena.Enums.ColorDepth.Color_4_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 4);
break;
case Arena.Enums.ColorDepth.Color_8_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 8);
break;
case Arena.Enums.ColorDepth.Color_24_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 24);
break;
case Arena.Enums.ColorDepth.Color_32_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 32);
break;
case Arena.Enums.ColorDepth.Color_48_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 48);
break;
case Arena.Enums.ColorDepth.Grayscale_8_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 8);
break;
case Arena.Enums.ColorDepth.Grayscale_10_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 10);
break;
case Arena.Enums.ColorDepth.Grayscale_24_bit:
selectedBithDepth = FindBestBitDepth(bitDepths, 24);
break;
}
if (selectedBithDepth > 0)
{
device.BitDepth = selectedBithDepth;
}
}
break;
case DeviceCapability.ICAP_XRESOLUTION:
if (docType.PreferredResolution != Resolution.Undefined)
{
TwainResolution[] resolutions = device.GetSupportedResolutions();
TwainResolution selectedResolution = null;
switch (docType.PreferredResolution)
{
case Resolution.DPI_72:
selectedResolution = FindBestResolution(resolutions, 72);
break;
case Resolution.DPI_150:
selectedResolution = FindBestResolution(resolutions, 150);
break;
case Resolution.DPI_300:
selectedResolution = FindBestResolution(resolutions, 300);
break;
case Resolution.DPI_600:
selectedResolution = FindBestResolution(resolutions, 600);
break;
}
if (selectedResolution != null)
{
device.Resolution = selectedResolution;
}
}
break;
}
}
switch (getCheckedMenuItemIndex(miPageSize))
{
case 0:
device.FrameSize = StaticFrameSizeType.LetterUS;
break;
case 1:
device.FrameSize = StaticFrameSizeType.LegalUS;
break;
case 2:
device.FrameSize = StaticFrameSizeType.USStatement;
break;
}
device.AutomaticDeskew = true;
device.AutoScan = true;
device.HideInterface = true;
device.DisplayProgressIndicator = false;
device.Acquire();
}
catch (Exception ex)
{
this.Cursor = Cursors.Default;
device.Close();
MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
this.Cursor = Cursors.Default;
}