private static WiaResult ShowWiaErrorCode(COMException ex)
{
WiaResult error = new WiaResult();
if (Enum.IsDefined(typeof(WiaError), (uint)ex.ErrorCode))
{
error.Error = ((WiaError)ex.ErrorCode);
}
else
{
error.Error = WiaError.UNKNOWN;
}
error.Message = ex.Message;
return(error);
}
/// <summary>
/// Scan images.
/// </summary>
/// <param name="images">Result image file path.</param>
/// <param name="scannerId">Guid of selected scanner.</param>
/// <param name="settings"></param>
public WiaResult Scan(out List <string> images, string scannerId, ScanSettings settings)
{
// give a default setting if null
if (settings == null)
{
settings = new ScanSettings();
}
images = new List <string>();
// parse file extension
string extension;
switch (settings.ImageFormat)
{
default:
case WiaImageFormat.PNG:
extension = ".png";
break;
case WiaImageFormat.BMP:
extension = ".bmp";
break;
case WiaImageFormat.GIF:
extension = ".gif";
break;
case WiaImageFormat.JPEG:
extension = ".jpg";
break;
case WiaImageFormat.TIFF:
extension = ".tif";
break;
}
// prepare result
WiaResult result = new WiaResult();
result.Error = WiaError.SUCCESS;
bool hasMorePages = true;
while (hasMorePages)
{
// select the correct scanner using the provided scannerId parameter
Device device = null;
foreach (DeviceInfo info in _manager.DeviceInfos)
{
if (info.DeviceID == scannerId)
{
// connect to scanner
device = info.Connect();
Property nameProp = info.Properties["Name"];
Property typeProp = info.Properties["Manufacturer"];
Property manufacturerProp = info.Properties["Manufacturer"];
Console.WriteLine(nameProp.get_Value().ToString());
Console.WriteLine(typeProp.get_Value().ToString());
Console.WriteLine(manufacturerProp.get_Value().ToString());
break;
}
}
// device was not found
if (device == null)
{
// enumerate available devices
string availableDevices = "";
foreach (DeviceInfo info in _manager.DeviceInfos)
{
availableDevices += info.DeviceID + "\n";
}
// show error with available devices
string message = "The device with provided ID could not be found. Available Devices:\n" + availableDevices;
WiaResult error = new WiaResult {
Error = WiaError.DEVICE_NOT_FOUND, Message = message
};
return(error);
}
// check paper
hasMorePages = HasMorePages(device);
if (!hasMorePages)
{
break;
}
// scan
Item item = device.Items[1];
try
{
SetScanSettings(item, settings);
ImageFile image;
if (settings.ShowUI)
{
// scan image with dialog
ICommonDialog wiaCommonDialog = new CommonDialog();
image = (ImageFile)wiaCommonDialog.ShowTransfer(item, settings.ImageFormat, false);
}
else
{
image = (ImageFile)item.Transfer(settings.ImageFormat);
}
// create temp directory
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
// save to temp file
string fileName = path + DateTime.Now.ToString("yyyyMMdd-HHmmss", System.Globalization.CultureInfo.InvariantCulture) + extension;
if (File.Exists(fileName))
{
File.Delete(fileName);
}
image.SaveFile(fileName);
// add file to output list
images.Add(fileName);
}
catch (COMException ex)
{
result = ShowWiaErrorCode(ex);
// if there are successfull scans, we juse break without showing error
if (result.Error == WiaError.WIA_ERROR_PAPER_EMPTY && images.Count > 0)
{
result.Error = WiaError.SUCCESS;
}
break;
}
catch (Exception ex)
{
result.Error = WiaError.UNKNOWN;
result.Message = ex.Message;
break;
}
finally
{
hasMorePages = HasMorePages(device);
}
}
return(result);
}
