private bool FilterMessage(NativeStructs.tagMSG msg)
{
if (twEvent.pEvent == IntPtr.Zero)
{
twEvent.pEvent = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(NativeStructs.tagMSG)));
}
Marshal.StructureToPtr(msg, twEvent.pEvent, false);
ResultCode rc = twainEvent(ref appId, ref deviceId, DataGroup.Control, DataArgumentType.Event, TwainMessages.ProcessEvent, ref twEvent);
if (rc != ResultCode.DSEvent && rc != ResultCode.NotDSEvent)
{
return(false);
}
switch (twEvent.TWMessage)
{
case TwainMessages.XferReady:
this.state = TwainState.TransferReady;
this.latestDIB = DoOneTransfer();
break;
case TwainMessages.CloseDSReq:
this.latestDIB = IntPtr.Zero;
DisableSource();
this.breakModalLoop = true;
break;
default:
break;
}
return(rc == ResultCode.DSEvent);
}
internal static extern bool TranslateMessage([In()] ref NativeStructs.tagMSG lpMsg);
internal static extern IntPtr DispatchMessage([In()] ref NativeStructs.tagMSG lpMsg);
internal static extern int GetMessage([Out()] out NativeStructs.tagMSG lpMsg, [In()] System.IntPtr hWnd, uint wMsgFilterMin, uint wMsgFilterMax);