public void CloseSrc()
{
TwRC rc;
if (srcds.Id != IntPtr.Zero)
{
TwUserInterface guif = new TwUserInterface();
rc = DSuserif(appid, srcds, TwDG.Control, TwDAT.UserInterface, TwMSG.DisableDS, guif);
rc = DSMident(appid, IntPtr.Zero, TwDG.Control, TwDAT.Identity, TwMSG.CloseDS, srcds);
}
}
public void Acquire(bool showUI)
{
TwRC rc;
CloseSrc();
if (appid.Id == IntPtr.Zero)
{
Init(hwnd);
if (appid.Id == IntPtr.Zero)
{
BuildScannerException(srcds, TwainScannerError.ScannerNotAvailable);
}
}
rc = DSMident(appid, IntPtr.Zero, TwDG.Control, TwDAT.Identity, TwMSG.OpenDS, srcds);
//
if (rc != TwRC.Success)
{
BuildScannerException(srcds, TwainScannerError.ScannerNotAvailable);
}
TwCapability cap = new TwCapability(TwCap.XferCount, 1);
rc = DScap(appid, srcds, TwDG.Control, TwDAT.Capability, TwMSG.Set, cap);
if (rc != TwRC.Success)
{
CloseSrc();
BuildScannerException(srcds, TwainScannerError.Other);
}
TwUserInterface guif = new TwUserInterface();
guif.ShowUI = Convert.ToInt16(showUI);
guif.ModalUI = 1;
guif.ParentHand = hwnd;
rc = DSuserif(appid, srcds, TwDG.Control, TwDAT.UserInterface, TwMSG.EnableDS, guif);
if (rc != TwRC.Success)
{
CloseSrc();
BuildScannerException(srcds, TwainScannerError.Other);
}
}
private static extern TwRC DSuserif([In, Out] TwIdentity origin, [In, Out] TwIdentity dest, TwDG dg, TwDAT dat, TwMSG msg, TwUserInterface guif);
