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WM_PALETTECHANGED message

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The WM_PALETTECHANGED message is sent to all top-level and overlapped windows after the window with the keyboard focus has realized its logical palette, thereby changing the system palette. This message enables a window that uses a color palette but does not have the keyboard focus to realize its logical palette and update its client area.

A window receives this message through its WindowProc function.

LRESULT CALLBACK WindowProc(
  HWND hwnd, 
  UINT  uMsg, 
  WPARAM wParam, 
  LPARAM lParam    
);

Parameters

wParam

A handle to the window that caused the system palette to change.

lParam

This parameter is not used.

Remarks

This message must be sent to all top-level and overlapped windows, including the one that changed the system palette. If any child windows use a color palette, this message must be passed on to them as well.

To avoid creating an infinite loop, a window that receives this message must not realize its palette, unless it determines that wParam does not contain its own window handle.

Requirements

Requirement Value
Minimum supported client
 Windows 2000 Professional [desktop apps only]
Minimum supported server
 Windows 2000 Server [desktop apps only]
Header
Winuser.h (include Windows.h)

See also

Colors Overview

Color Messages

WM_PALETTEISCHANGING

WM_QUERYNEWPALETTE