Was this page helpful?
Your feedback about this content is important. Let us know what you think.
Additional feedback?
1500 characters remaining
Export (0) Print
Expand All
MFC
Expand Minimize
Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

CWnd::Invalidate 

Invalidates the entire client area of CWnd.


void Invalidate(
   BOOL bErase = TRUE 
);

Parameters

bErase

Specifies whether the background within the update region is to be erased.

The client area is marked for painting when the next WM_PAINT message occurs. The region can also be validated before a WM_PAINT message occurs by the ValidateRect or ValidateRgn member function.

The bErase parameter specifies whether the background within the update area is to be erased when the update region is processed. If bErase is TRUE, the background is erased when the BeginPaint member function is called; if bErase is FALSE, the background remains unchanged. If bErase is TRUE for any part of the update region, the background in the entire region, not just in the given part, is erased.

Windows sends a WM_PAINT message whenever the CWnd update region is not empty and there are no other messages in the application queue for that window.

See the example for CWnd::UpdateWindow.

Community Additions

ADD
Show:
© 2015 Microsoft