In some cases, you may need to take a window's custom control and subclass
it with an OLE control. However, when the control is built using MFC 4.0
and being used in Windows 95, the OLE control may paint incorrectly.
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A typical OnDraw() handler in an OLE control that subclasses a window's
custom control makes a call to DoSuperclassPaint(). In Windows 95, The MFC
4.0 implementation of DoSuperClassPaint() has been changed to send a
WM_PRINT message to the custom control's window procedure instead of a
WM_PAINT message. If the original custom control does not handle WM_PRINT,
the OLE control will not paint correctly.
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It is necessary for the original custom control to handle the
WM_PRINTCLIENT message, which is what the DefWindowProc sends in response
to receiving a WM_PRINT message. The WM_PRINTCLIENT message should be
handled in the same manner as the WM_PAINT message except that the calls to
BeginPaint() and EndPaint() should be removed.
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This behavior is by design.
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