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Problems with SendMessage

Posted on 1998-12-06
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Last Modified: 2013-11-20
Hi!
 I use VC++5. My app is SDI. From the main thread (CWinApp), in the doc file,i create a new thread using a class derived from CWinThread giving in the constructor the handle to the doc view (derived from CEditView).
 The problem is, that in the new thread I try to post a message to the view of the doc using the PostMessage function and the handle to the view (HWND) as parameter --> there is not error, but the message doesn't reach the window queue.
 If I send a message to the AfxGetMainWnd()(so to the main window), its working. What's the problem?
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Question by:visualc
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by:visualc
ID: 1325797
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by:Answers2000
ID: 1325798
Are you using SendMessage/PostMessage right for the view, to get the HWND you do

::PostMessage( pView->m_hWnd, ...etc...)
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prasanth earned 50 total points
ID: 1325799
The problem lies with passing the thread a handle to the doc view. CWnds are thread-specific - you can't pass them between threads. You can, however, pass the HWNDs between threads. So change your constructor from taking a CWnd (or a CEditView, or whatever) to taking a HWND. Then call the constructor with pView->GetSafeHwnd() as the parameter. Then you can SendMessage(m_docviewhwnd, ...) from your thread.
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