Microsoft KB Archive/104963

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BUG: SelectClipRgn Does Not Update Properly on Printer

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Q104963

3.10 WINDOWS kbprg kbbuglist

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SYMPTOMS
In a Windows 3.1 printing application, calling SelectClipRgn with the second parameter set to NULL to reset the clipping region to clip output to the printer page does not reset the clipping region. Clipping on the printer device context is still set to the clipping region specified in the previous call to SelectClipRgn.

CAUSE
The HP LaserJet II and HP LaserJet III printer drivers do not handle the call to SelectClipRgn properly when the hrgn parameter is set to NULL. Instead of setting the clipping region to be the entire printable page (as it should), the call has no effect and the previous clipping region is still the device context's clipping region.

RESOLUTION
Instead of sending NULL as the hrgn parameter to SelectClipRgn, create a region of the printable area of the page and send that region as the hrgn parameter. This will give the desired effect of calling SelectClipRgn(hPrnDC, NULL). The following is an example of how this workaround could be implemented:

  HRGN hRgn,hPageRgn; POINT pt;

SelectClipRgn(hPrnDC,hRgn=CreateRectRgn(200,200,500,500)); // . .  .   // SelectClipRgn(hPrnDC,NULL); // Instead of calling the above function, try this: pt.x=GetDeviceCaps(hPrnDC,HORZRES); pt.y=GetDeviceCaps(hPrnDC,VERTRES); SelectClipRgn(hPrnDC,hPageRgn=CreateRectRgn(0,0,pt.x,pt.y)); DeleteObject(hRgn); DeleteObject(hPageRgn);

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

Additional query words: buglist3.10 3.10

Keywords : kbOSWin310 _IK kbSDKWin16

Issue type : kbbug

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310