Microsoft KB Archive/142445

= DOC: CWnd::LockWindowUpdate Does Not Unlock the Window =

Article ID: 142445

Article Last Modified on 12/2/2003

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APPLIES TO


 * Microsoft Visual C++ 1.0 Professional Edition
 * Microsoft Visual C++ 1.5 Professional Edition
 * Microsoft Visual C++ 1.51
 * Microsoft Visual C++ 1.52 Professional Edition
 * Microsoft Visual C++ 2.0 Professional Edition
 * Microsoft Visual C++ 2.1
 * Microsoft Visual C++ 2.2
 * Microsoft Visual C++ 4.0 Standard Edition
 * Microsoft Foundation Class Library 4.2

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This article was previously published under Q142445



SUMMARY
The documentation for CWnd::LockWindowUpdate states this function will disable or reenable drawing for the CWnd object. In the remarks section, the sentence "Disables or reenables drawing in the given window" is incorrect. Starting with Visual C++ version 2.0, you should use CWnd::UnlockWindowUpdate to reenable drawing to a window locked with CWnd::LockWindowUpdate.

The documentation error was corrected in Visual C++ 4.1.



MORE INFORMATION
CWnd::LockWindowUpdate takes no parameters and is implemented as an in-line call to the Windows function ::LockWindowUpdate. The function ::LockWindowUpdate is called with the this->m_hWnd parameter which causes the window to be locked. To re-enable drawing, NULL should be passed to ::LockWindowUpdate.

In Visual C++ version 2.0 and later, call CWnd::UnlockWindowUpdate to reenable drawing to your window. In earlier versions, call the Windows ::LockWindowUpdate( NULL ).

Additional query words: 1.00 1.50 2.00 2.10 2.20 dskbsweep 4.00 4.10

Keywords: kbbug kbfix kbuidesign kbvc410fix kbdocfix kbdocerr KB142445

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