protected IntPtr FilterMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (DataSource.SourceId.Id == 0)
{
handled = false;
return(IntPtr.Zero);
}
int pos = User32Native.GetMessagePos();
WindowsMessage message = new WindowsMessage();
message.hwnd = hwnd;
message.message = msg;
message.wParam = wParam;
message.lParam = lParam;
message.time = User32Native.GetMessageTime();
message.x = (short)pos;
message.y = (short)(pos >> 16);
Marshal.StructureToPtr(message, _eventMessage.EventPtr, false);
_eventMessage.Message = 0;
TwainResult result = Twain32Native.DsEvent(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.Event,
Message.ProcessEvent,
ref _eventMessage);
if (result == TwainResult.NotDSEvent)
{
handled = false;
return(IntPtr.Zero);
}
switch (_eventMessage.Message)
{
case Message.XFerReady:
Exception exception = null;
try
{
TransferPictures();
}
catch (Exception e)
{
exception = e;
}
CloseDsAndCompleteScanning(exception);
break;
case Message.CloseDS:
case Message.CloseDSOK:
case Message.CloseDSReq:
CloseDsAndCompleteScanning(null);
break;
case Message.DeviceEvent:
break;
default:
break;
}
handled = true;
return(IntPtr.Zero);
}
protected IntPtr FilterMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (DataSource.SourceId.Id == 0)
{
handled = false;
return(IntPtr.Zero);
}
int pos = User32Native.GetMessagePos();
WindowsMessage message = new WindowsMessage();
message.hwnd = hwnd;
message.message = msg;
message.wParam = wParam;
message.lParam = lParam;
message.time = User32Native.GetMessageTime();
message.x = (short)pos;
message.y = (short)(pos >> 16);
Marshal.StructureToPtr(message, _eventMessage.EventPtr, false);
_eventMessage.Message = 0;
TwainResult result = Twain32Native.DsEvent(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.Event,
Message.ProcessEvent,
ref _eventMessage);
if (result == TwainResult.NotDSEvent)
{
handled = false;
return(IntPtr.Zero);
}
switch (_eventMessage.Message)
{
case Message.XFerReady:
IList <IntPtr> imagePointers = TransferPictures();
foreach (IntPtr image in imagePointers)
{
using (var renderer = new BitmapRenderer(image))
{
Images.Add(renderer.RenderToBitmap());
}
}
EndingScan();
DataSource.Close();
ScanningComplete(this, EventArgs.Empty);
break;
case Message.CloseDS:
EndingScan();
DataSource.Close();
break;
case Message.CloseDSOK:
EndingScan();
DataSource.Close();
break;
case Message.DeviceEvent:
break;
}
handled = true;
return(IntPtr.Zero);
}
