private static extern TwRC DSpxfer([In, Out] TwIdentity origin, [In] TwIdentity dest, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwPendingXfers pxfr);
/// <summary>
/// Transfers images from the scanner. Starts image processing by processing delegate chains.
/// </summary>
/// <param name="siteId"></param>
/// <returns></returns>
public bool TransferPictures(Voucher voucherData)
{
if (m_srcDs.Id == IntPtr.Zero)
{
return(false);
}
TwRC rc;
IntPtr hbitmap = IntPtr.Zero;
TwPendingXfers pxfr = new TwPendingXfers();
do
{
pxfr.Count = 0;
try
{
//Acquirs image from scanner
TwImageInfo iinf = new TwImageInfo();
rc = DSiinf(m_appId, m_srcDs, TwDG.Image, TwDAT.ImageInfo, TwMSG.Get, iinf);
if (rc != TwRC.Success)
{
return(false);
}
rc = DSixfer(m_appId, m_srcDs, TwDG.Image, TwDAT.ImageNativeXfer, TwMSG.Get, ref hbitmap);
if (rc != TwRC.XferDone)
{
return(false);
}
rc = DSpxfer(m_appId, m_srcDs, TwDG.Control, TwDAT.PendingXfers, TwMSG.EndXfer, pxfr);
if (rc != TwRC.Success)
{
return(false);
}
//Reads voucher data from common context
if (voucherData == null)
{
voucherData = ScanAppContext.FillFromScanContext(new Voucher());
}
//Creates temporary state object
StateObj stateObj = new StateObj()
{
Main = MainForm,
Scan = ScanForm,
Dib = hbitmap,
};
//Creates processing delegate chain. Start processing the image.
var del = DelegateUtils.GetProcessDelegateChain();
del.FireAndForget(voucherData, stateObj);
voucherData = null;
}
finally
{
DSpxfer(m_appId, m_srcDs, TwDG.Control, TwDAT.PendingXfers, TwMSG.Reset, pxfr);
}
}while (pxfr.Count != 0 && !UseImprinter);
return(true);
}