The WM_CTLCOLOREDIT message is sent to the parent window of an edit control when the control is about to be drawn. By responding to this message, the parent window can use the given device context handle to set the text and background colors of the edit control.
WM_CTLCOLOREDIT hdcEdit = (HDC) wParam; // handle of display context hwndEdit = (HWND) lParam; // handle of static control
If an application processes this message, it must return the handle of a brush. Windows uses the brush to paint the background of the edit control.
The DefWindowProc function selects the default system colors for the edit control.
The WM_CTLCOLOREDIT message is never sent between threads, it is only sent within the same thread.
DefWindowProc, RealizePalette, SelectPalette, WM_CTLCOLORBTN, WM_CTLCOLORDLG, WM_CTLCOLORLISTBOX, WM_CTLCOLORMSGBOX, WM_CTLCOLORSCROLLBAR, WM_CTLCOLORSTATIC