WM_NCPAINT message
The WM_NCPAINT message is sent to a window when its frame must be painted.
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 update region of the window. The update region is clipped to the window frame.
- lParam
-
This parameter is not used.
Return value
An application returns zero if it processes this message.
Remarks
The DefWindowProc function paints the window frame.
An application can intercept the WM_NCPAINT message and paint its own custom window frame. The clipping region for a window is always rectangular, even if the shape of the frame is altered.
The wParam value can be passed to GetDCEx as in the following example.
case WM_NCPAINT: { HDC hdc; hdc = GetDCEx(hwnd, (HRGN)wParam, DCX_WINDOW|DCX_INTERSECTRGN); // Paint into this DC ReleaseDC(hwnd, hdc); }
Requirements
|
Minimum supported client |
Windows 2000 Professional [desktop apps only] |
|---|---|
|
Minimum supported server |
Windows 2000 Server [desktop apps only] |
|
Header |
|
See also
- Painting and Drawing Overview
- Painting and Drawing Messages
- DefWindowProc
- GetWindowDC
- WM_PAINT
- GetDCEx