Getting pointer to CMainFrame with AfxGetMainWnd not working ? 
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 Getting pointer to CMainFrame with AfxGetMainWnd not working ?

Hi,

I was trying to get a pointer to the CMainFrame from another class using
this code:

CMainFrame* pFrame=(CMainFrame*)AfxGetMainWnd();

which i have read will get a pointer from anywhere, but it didn't work and
pFrame was empty after calling. I got the pointer ok using this code

CMainFrame* pFrame = (CMainFrame) AfxGetApp()->m_pMainWnd;

but was wondering why the first code failed and this worked and if there is
certain times when one should be used and the other not or instances which
would result in the return pointer not being valid so the other should be
used like above??

Thanks,
Scott



Fri, 03 Sep 2004 21:09:12 GMT  
 Getting pointer to CMainFrame with AfxGetMainWnd not working ?
According to MSDN:

Return Value of AfxGetMainWnd( ):

If AfxGetMainWnd is called from the application's primary thread, it
returns the application's main window according to the above rules. If the
function is called from a secondary thread in the application, the function
returns the main window associated with the thread that made the call.

Therefore, the routine may return NULL if the calling thread has no Main
Window.



Sun, 05 Sep 2004 14:43:43 GMT  
 
 [ 2 post ] 

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