Unable to process data source messages?

[twainuser123]

Hi,

I am still new to TWAIN and am now at the stage of implementing the event loop (on windows Vista on MSVC++), but am running into problems.
Basically, TW_EVENT.TWMessage is always set to 0 using the below code:

TW_EVENT curEvent;

curEvent.pEvent = (TW_MEMREF)curMesage;



//Ask the data source to fill 'curEvent'

DSM_Entry(&appIdentity, &curDataSource, DG_CONTROL, DAT_EVENT, MSG_PROCESSEVENT, (TW_MEMREF)&curEvent);

if (this->lastDSMReturnCode != TWRC_DSEVENT)

{	//This event does not belong to the data source (or there was a failure)

return true;	//The application should process this message

}



if (curEvent.TWMessage)

{	//This line is never reached!!

return true;

}

If it helps, I am new to Windows and am using

HWND appWindow = FindWindow(NULL, NULL);

to get the HWND for the application. The UI for the data source loads fine, but maybe this HWND is the problem?

I am targeting a command-line application so do not want to show a UI eventually.

Thanks in advance!

[twainuser123]

Nevermind…

I found out that I needed an event loop.

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