how to not paint window any more?

Question

I create a window and I do not want it re- render itselft.

I will draw something in WM_CREATE and then it do not render again.

how to do it?

no matter I maximize or minimalize it will not render itsselft.

Answer 1

WM_CREATE is only ever sent to the window once. It is sent during the call of CreateWindowEx. So it is natural that anything drawn in WM_CREATE will only be drawn once.

The normal way of drawing to the window is done by handling the WM_PAINT message. This message is sent whenever the Window needs to be drawn. It is rare that a Windows application will not draw in the WM_PAINT handler, games tend to be the biggest application type that draws independently of the windows messages.

Answer 2

To not draw in WM_PAINT, you can use DirectComposition

(https://learn.microsoft.com/en-us/archive/msdn-magazine/2014/june/windows-with-c-high-performance-window-layering-using-the-windows-composition-engine)