The difference between GetDC and GetWindowDC-优快云博客

本文链接：https://blog.youkuaiyun.com/kisserLeon/article/details/1573637

本文介绍了GetDC和GetWindowDC两个API函数，用于获取指定窗口的设备上下文（DC），以便进行绘图操作。GetDC获取的是客户区的DC，而GetWindowDC则可以获取整个窗口的DC，包括标题栏、菜单和滚动条等。

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GetDC

The GetDC function retrieves a handle of a display device context (DC) for the client area of the specified window. The display device context can be used in subsequent GDI functions to draw in the client area of the window.

This function retrieves a common, class, or private device context depending on the class style specified for the specified window. For common device contexts, GetDC assigns default attributes to the device context each time it is retrieved. For class and private device contexts, GetDC leaves the previously assigned attributes unchanged.

HDC GetDC(

HWND hWnd // handle of window

);

Parameters

hWnd

Identifies the window whose device context is to be retrieved.

GetWindowDC

The 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.

HDC GetWindowDC(

HWND hWnd // handle of window

);

Parameters

hWnd

Identifies the window with a device context that is to be retrieved.