PRB: DoSuperclassPaint Calls WM_PRINT for Windows 95

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.

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.

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.

This behavior is by design.