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stooge_dev

closing all child windows in text editor

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Hi, I''m writing a text editor and would like to add a Close All command. I have tried putting the below code in the WndProc and MDIProc, but nothing happens. What is a solution to my problem?
case CM_CLOSEALL:
   {
      HWND hwnd = FindWindow(g_szChildClassName,NULL);
      SendMessage(hwnd, WM_CLOSE, 0,0);
   }
 
Thank you for your help.

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