/// <summary>
/// Performs scan from the scanner ADF and produces image on both sides
/// </summary>
/// <param name="scanner_uri"></param>
/// <returns></returns>
public static List <byte[]> GetScannedImageADF(string scanner_uri, bool duplex, int type, int threshold)
{
var selected_scanner = GetDesiredScanner(scanner_uri).Connect();
var scannerItem = selected_scanner.Items[1];
SetDeviceIntProperty(ref selected_scanner, 3096, 1);
if (duplex)
{
// set the scanner to get papers from ADF on both sides
SetDeviceIntProperty(ref selected_scanner, 3088, 5);
}
else
{
// set the scanner to get papers from ADF on one side
SetDeviceIntProperty(ref selected_scanner, 3088, 1);
}
// greyscale instead of black and white
SetWIAProperty(scannerItem.Properties, "6146", type);
SetWIAProperty(scannerItem.Properties, "6159", threshold);
try
{
// SET DPI to 150
SetWIAProperty(scannerItem.Properties, "6147", 150);
SetWIAProperty(scannerItem.Properties, "6148", 150);
// Set paper A4 resolution to be
SetWIAProperty(scannerItem.Properties, "6151", 1754);
SetWIAProperty(scannerItem.Properties, "6152", 1240);
}
catch (Exception)
{
}
System.Drawing.Imaging.Encoder encoder = System.Drawing.Imaging.Encoder.SaveFlag;
System.Drawing.Imaging.Encoder encComp = System.Drawing.Imaging.Encoder.Compression;
EncoderParameters encoderParameters = new EncoderParameters(2);
ImageCodecInfo encoderInfo = ImageCodecInfo.GetImageEncoders().First(i => i.MimeType == "image/tiff");
encoderParameters.Param[0] = new EncoderParameter(encoder, (long)EncoderValue.MultiFrame);
encoderParameters.Param[1] = new EncoderParameter(encComp, (long)EncoderValue.CompressionLZW);
var front = ImageFileToStream((ImageFile)scannerItem.Transfer(FormatID.wiaFormatPNG));
var tifImg = new TiffImage(front);
while (true)
{
try
{
var imgfrnt = new TiffImage(ImageFileToStream((ImageFile)scannerItem.Transfer(FormatID.wiaFormatPNG)));
tifImg.Append(imgfrnt);
}
catch (Exception)
{
break;
}
}
var ret = new List <byte[]>();
foreach (var item in tifImg.ToByteArrayList())
{
var rotated_img = RotateIfHorizontal(item);
if (type == 4)
{
ret.Add(convertToBlackAndWhite(rotated_img));
}
else
{
ret.Add(rotated_img);
}
}
return(ret);
}