GetDC() function retrieves a handle to a display device context for the client area of a specified window or for the entire screen. You can use the returned handle in subsequent GDI functions to draw in the device context.
| 1 || HDC GetDC(
| 2 || HWND hWnd /* handle to a window */
| 3 || );|
GetWindowDC() function retrieves the device context (DC) for the entire window, including title bar, menus, and scroll bars. A window device context permits painting anywhere in a window, because the origin of the device context is the upper-left corner of the window instead of the client area.
GetWindowDC assigns default attributes to the window device context each time it retrieves the device context. Previous attributes are lost.
| 1 || HDC GetWindowDC(
| 2 || HWND hWnd /* handle of window */
| 3 || );|
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