public override bool SelectDevice()
{
CommonDialogClass wiaCommonDialog = new CommonDialogClass();
Device device = null;
try
{
device = wiaCommonDialog.ShowSelectDevice(WiaDeviceType.ScannerDeviceType, true, true);
if (device != null)
{
m_DeviceID = device.DeviceID;
FillDeviceData(device);
return(true);
}
else
{
return(false);
}
}
catch (COMException ex)
{
if ((WiaScannerError)ex.ErrorCode == WiaScannerError.ScannerNotAvailable)
{
return(false);
}
else
{
WiaScannerException se = BuildScannerException(device, ex);
throw se;
}
}
}
public override void AcquireImages(bool showUI)
{
CommonDialogClass wiaCommonDialog = new CommonDialogClass();
if (m_DeviceID == null)
{
SelectDevice();
}
//Create DeviceManager
Device WiaDev = CreateDeviceManager();
WIA.Item scanningItem = GetScanningProperties(showUI, wiaCommonDialog, WiaDev);
if (scanningItem == null)
{
return;
}
WIA.ImageFile imgFile = null;
WIA.Item item = null;
PrepareImagesList();
//Start Scan
while (HasMorePages(WiaDev))
{
item = scanningItem;
try
{
imgFile = ScanImage(wiaCommonDialog, imgFile, item);
}
catch (COMException ex)
{
if ((WiaScannerError)ex.ErrorCode == WiaScannerError.PaperEmpty)
{
break;
}
else
{
WiaScannerException se = BuildScannerException(WiaDev, ex);
throw se;
}
}
catch (Exception ex)
{
WiaScannerException se = BuildScannerException(WiaDev, ex);
throw se;
}
finally
{
item = null;
}
}
}
private WiaScannerException BuildScannerException(Device WiaDev, Exception exception)
{
WiaScannerException scannerException = new WiaScannerException(exception);
if (exception is COMException)
{
scannerException.ErrorCode = (exception as COMException).ErrorCode;
}
if (m_ScannerDeviceData != null)
{
scannerException.ScannerDeviceData = m_ScannerDeviceData;
scannerException.WiaVersion = m_WiaVersion;
}
return(scannerException);
}
private bool HasMorePages(Device WiaDev)
{
try
{
bool hasMorePages = false;
//determina si hay mas de una pagina en espera
Property documentHandlingSelect = null;
Property documentHandlingStatus = null;
foreach (Property prop in WiaDev.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;
}
}
if (documentHandlingSelect != null) //may not exist on flatbed scanner but required for feeder
{
//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);
}
}
return(hasMorePages);
}
catch (COMException ex)
{
WiaScannerException se = BuildScannerException(WiaDev, ex);
throw se;
}
}
