DWM Messages

This section contains information about the Desktop Window Manager (DWM) messages.

In this section

Topic Description
WM_DWMCOLORIZATIONCOLORCHANGED
Informs all top-level windows that the colorization color has changed.
WM_DWMCOMPOSITIONCHANGED
Informs all top-level windows that DWM composition has been enabled or disabled.
[!Note]
As of Windows 8, DWM composition is always enabled, so this message is not sent regardless of video mode changes.

WM_DWMNCRENDERINGCHANGED
Sent when the non-client area rendering policy has changed.
WM_DWMSENDICONICLIVEPREVIEWBITMAP
Instructs a window to provide a static bitmap to use as a live preview (also known as a Peek preview) of that window.
WM_DWMSENDICONICTHUMBNAIL
Instructs a window to provide a static bitmap to use as a thumbnail representation of that window.
WM_DWMWINDOWMAXIMIZEDCHANGE
Sent when a DWM composed window is maximized.