Windows api invalidate

Privacy policy. The InvalidateRect function adds a rectangle to the specified window's update region. The update region represents the portion of the window's client area that must be redrawn. A handle to the window whose update region has changed. Setting this parameter to NULL is not recommended. This is turning me mad! It seems to be a problem with Windows 10 as I tried on al older machine and the error did not appear. Any help?

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Any other inappropriate content or behavior as defined by the Terms of Use or Code of Conduct. Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services. Privacy policy. Thank you. Microsoft makes no warranties, express or implied, with respect to the information provided here. Invalidates a specific region of the control and causes a paint message to be sent to the control. Invalidates the specified region of the control adds it to the control's update region, which is the area that will be repainted at the next paint operation , and causes a paint message to be sent to the control.

Optionally, invalidates the child controls assigned to the control. The Region to invalidate. Calling the Invalidate method does not force a synchronous paint; to force a synchronous paint, call the Update method after calling the Invalidate method. If this parameter is NULL , the entire client area is added to the update region. Specifies whether the background within the update region should be erased when the update region is processed.

If the bErase parameter is TRUE for any part of the update region, the background in the entire region is erased, not just in the specified part. Painting and Drawing Functions.