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    <p>Allowing the <code>ProcessMessages</code> to continue even if it sends messages you don't want should not be classed as problematic. With a bit of code refactoring, you could move the buffering method into a separate thread and go from there.</p> <p>If you are attempting to copy the "visual contents" of a control into a file,</p> <ul> <li>look at the WM_PRINT(xxx) message which allows child controls to paint themselves into bitmaps</li> <li>try the <code>LockWindowUpdate</code> Win32 API method call which will turn off all painting messages to that control</li> <li>override the <code>WndProc</code>/<code>DefaultWndProc</code> method on your control class or even the parent class if you need to and simply return "true" for each message sent</li> <li>override specific control methods (such as "scroll bar moved", "<code>OnPaint</code>", "<code>OnPaintBackground</code>" etc) on the control class or even the parent and simply do nothing if your buffering is in progress</li> </ul> <p>Overriding the <code>WndProc</code> or <code>DefaultWndProc</code> and simply returning true for each message essentially "turns off" <code>ProcessMessages</code> <em>but</em> it's not safe to do it this way because the control might need to process one or more messages to function correctly.</p> <p>Turning off <code>ProcessMessages</code> is not possible (without rewriting the VCL code for message processing) because of the fact that it's part of how the VCL form's message loop has been constructed. </p>
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    1. POHow to Prevent ProcessMessages in Delphi
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    1. USMike J
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    1. COThe LockWindowUpdate seems to be what I was looking for. And your other ideas are good too. Thanks.
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    2. COThe LockWindowUpdate() API should never be used, according to Raymond Chen: http://blogs.msdn.com/oldnewthing/archive/2007/02/23/1747713.aspx At least it should not be used for what you want to use it for: http://blogs.msdn.com/oldnewthing/archive/2007/02/22/1742084.aspx
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    3. COHmmm. Thanks mghie. Your warning will be heeded. But Mike still gave me a lot of information about the processing to lead me in the right direction.
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