Processing Arrow Keys in a Modeless Dialog (DLL)

[Justin Cooke]

Greetings All, I'm trying to process the arrow keys in a modeless dialog implemented as a DLL (MFC.) I've tried various methods based on what I've found on CodeProject, but none have worked. OnKeyDown() and PreTranslateMessage() are never called in my dlg. Instead, PreTranslateMessage() in the client application that uses the DLL is called whenever I press the keys. I also tried overriding OnGetDlgCode() in my DLL dlg class and returning DLGC_WANTMESSAGE and DLGC_WANTALLKEYS, but that also had no effect. I can't change anything in the client app to handle this because I'm not normally in control of that. Any suggestions would be greatly appreciated. Thanks, Justin

[mangellj]

If you haven't already tried it, consider overridding the modeless Dialog's DefWindowProc and handling the WM_KEYDOWN there. If you have already tried it and it didn't work, sorry for wasting your time.

[Justin Cooke]

I hadn't tried it yet, but I did today and I still had the same problem. Thanks for the advice, though. Not a waste of time at all :) I had forgotten about that particular override. By the way, I found a description on MS' website about how to call a "FilterDllMsg()" func from the main app's PreTranslateMessage() and that, at least, allowed me to recieve the key messages in the dialog. (I'd rather be able to do this without modifying the main app code, but it's a start.) However, I have a wierd crash bug now that goes away if I change the "m_pMainWnd = &dlg;" line in my main app's InitInstance() func to "m_pMainWnd = NULL;" If I press a key in the dialog, the DLL/app freeze. I'm probably going to post another question about this problem. Thanks Again, Justin Here's the link to the MS sample: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vcsample/html/vcsamDllScreenCapSample.asp