请教一下openGL 中经常出现“设备描述表”这么个东西是干什么用的？

[妙行晨风]

HGLRC hRC=NULL;
HDC hDC=NULL;
HWND hWnd=NULL;
HINSTANCE hInstance;

[www_adintr_com]

这些东西是 windows 系统定义的

[赵4老师]

查MSDN是Windows程序员必须掌握的技能之一。 mk:@MSITStore:C:\MSDN98\98VS\2052\vccore.chm::/html/_core_device_contexts.htm Device Contexts Home | Overview | How Do I | Tutorial A device context is a Windows data structure containing information about the drawing attributes of a device such as a display or a printer. All drawing calls are made through a device-context object, which encapsulates the Windows APIs for drawing lines, shapes, and text. Device contexts allow device-independent drawing in Windows. Device contexts can be used to draw to the screen, to the printer, or to a metafile. CPaintDC objects encapsulate the common idiom of Windows, calling the BeginPaint function, then drawing in the device context, then calling the EndPaint function. The CPaintDC constructor calls BeginPaint for you, and the destructor calls EndPaint. The simplified process is to create the CDC object, draw, and destroy the CDC object. In the framework, much of even this process is automated. In particular, your OnDraw function is passed a CPaintDC already prepared (via OnPrepareDC), and you simply draw into it. It is destroyed by the framework and the underlying device context is released to Windows upon return from the call to your OnDraw function. CClientDC objects encapsulate working with a device context that represents only the client area of a window. The CClientDC constructor calls the GetDC function, and the destructor calls the ReleaseDC function. CWindowDC objects encapsulate a device context that represents the whole window, including its frame. CMetaFileDC objects encapsulate drawing into a Windows metafile. In contrast to the CPaintDC passed to OnDraw, you must in this case call OnPrepareDC yourself. Mouse Drawing Most drawing in a framework program—and thus most device-context work—is done in the view’s OnDraw member function. However, you can still use device-context objects for other purposes. For example, to provide tracking feedback for mouse movement in a view, you need to draw directly into the view without waiting for OnDraw to be called. In such a case, you can use a CClientDC device-context object to draw directly into the view. What do you want to know more about? Device contexts in Win32 documentation Drawing Drawing tutorial Mouse drawing Mouse drawing tutorial Lines and curves Filled shapes Fonts and text Colors Coordinate spaces and transformations