GetDC怎么用???干什么的?

2025-02-26 15:15:29

推荐回答（3个）

回答1：

获取设备指针

比如画图的时候用。

GetDC 函数状态: 正式函数 ,建设者:yello2000i ,最新更新时间: 2001-9-3 0:48:07 修改该函数

函数功能描述:该函数检索一指定窗口的客户区域或整个屏幕的显示设备上下文的句柄.以后可以在GDI函数中用该句柄绘图.

.函数原型:
HDC GetDC(HWND hWnd);

.参数:
hWnd:检索的窗口的句柄,若为NULL,GetDC则检索整个屏幕的设备上下文环境.
Windows 98,WindowsNT5.0或以后版本:如果hWnd=NULL,GetDC检索的首要是显示器的设备上下文环境,要得到其他的显示器的设备上下文环境,可用EnumDisplayMonitors和CreateDC函数.

.返回值:
如果成功,返回指定窗口客户区的设备上下文环境;如果失败,返回值为NULL.
Windows NT/ 2000 中可以通过调用GetLastError得到更多的错误信息。

回答2：

CWnd::GetDC
CDC* GetDC( );

Return Value

Identifies the device context for the CWnd client area if successful; otherwise, the return value is NULL. The pointer may be temporary and should not be stored for later use.

Remarks

Retrieves a pointer to a common, class, or private device context for the client area depending on the class style specified for the CWnd. For common device contexts, GetDC assigns default attributes to the context each time it is retrieved. For class and private contexts, GetDC leaves the previously assigned attributes unchanged. The device context can be used in subsequent graphics device interface (GDI) functions to draw in the client area.

Unless the device context belongs to a window class, the ReleaseDC member function must be called to release the context after painting. Since only five common device contexts are available at any given time, failure to release a device context can prevent other applications from accessing a device context.

A device context belonging to the CWnd class is returned by the GetDC member function if CS_CLASSDC, CS_OWNDC, or CS_PARENTDC was specified as a style in the WNDCLASS structure when the class was registered.

回答3：

用来获取设备DC的,是用来绘图等等用的.

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