public bool ProcessEvent(TwIdentity dataSourceId, ref WINMSG message, ref TwMSG result)
{
TwEvent evtmsg;
evtmsg.Message = 0;
evtmsg.EventPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(WINMSG)));
Marshal.StructureToPtr(message, evtmsg.EventPtr, false);
TwRC rc = LibTwain32.DSevent(fApplicationId, dataSourceId, TwDG.Control, TwDAT.Event, TwMSG.ProcessEvent, ref evtmsg);
Marshal.FreeHGlobal(evtmsg.EventPtr);
result = evtmsg.Message;
return (bool)(rc == TwRC.DSEvent);
}
// IMessageFilter
public bool PreFilterMessage(ref Message m)
{
bool handled = false;
if(IsActive())
{
int pos = LibUser32.GetMessagePos();
WINMSG message = new WINMSG();
message.hwnd = m.HWnd;
message.message = m.Msg;
message.wParam = m.WParam;
message.lParam = m.LParam;
message.time = LibUser32.GetMessageTime();
message.x = (short)pos;
message.y = (short)(pos >> 16);
TwMSG msgCode = 0;
if(fTwain.ProcessEvent(fIdent, ref message, ref msgCode))
{
switch(msgCode)
{
case TwMSG.XFerReady:
{
bool success = TransferPictures();
if((success == false) || (fSettings.ShowSettingsUI == false))
{
Stop(); // Need this only if UI is not enabled
}
}
break;
case TwMSG.CloseDS:
case TwMSG.CloseDSOK:
case TwMSG.CloseDSReq:
{
Stop(); // This happens only if UI is enabled
}
break;
case TwMSG.DeviceEvent:
break;
default:
break;
}
handled = true;
}
}
return handled;
}
