winapi - 调用 GetDC(NULL) 返回什么类型的 DC？

Question

Windows API 函数 GetDC() 接受单个参数:

hWnd

A handle to the window whose DC is to be retrieved. If this value is NULL, GetDC retrieves the DC for the entire screen.

在页面下方，注明以下内容:

After painting with a common DC, the ReleaseDC function must be called to release the DC. Class and private DCs do not have to be released. ReleaseDC must be called from the same thread that called GetDC. The number of DCs is limited only by available memory.

不幸的是，目前尚不清楚是否可以调用ReleaseDC()对于屏幕 DC 来说是必需的，因为它的类型没有在任何地方提到。事实上，this page描述了五种类型的 DC；但他们都没有提到“屏幕”。

我需要打电话ReleaseDC()在屏幕 DC 上？

Answer 1

屏幕 DC 不是类 DC，也不是私有(private) DC，所以是的 - 它需要发布。