BUG: Iconic MDI Application Titles Do Not Update Properly

• Microsoft Windows Software Development Kit (SDK) for Windows, version 3.1

SYMPTOMS

In a Windows 3.1 multiple document interface (MDI) application, the icon title of the MDI frame window does not update when the SetWindowText function is used to change the text of the icon title.

CAUSE

In an MDI application, the main window calls DefFrameProc instead of DefWindowProc to handle unprocessed messages. DefFrameProc does not handle the WM_SETTEXT message (which is generated by SetWindowText) correctly when the main window is minimized, because it does not update the title after the change has been made.

RESOLUTION

To update the minimized MDI frame's title, you can process the MDI frame's WM_SETTEXT message and call both the DefFrameProc and DefWindowProc functions. The following code demonstrates this workaround:

   case WM_SETTEXT:
       DefFrameProc (hwnd,hwndMDIClient,msg,wParam,lParam);
       return DefWindowProc (hwnd,msg,wParam,lParam);