wglGetProcAddress function (wingdi.h)

The wglGetProcAddress function returns the address of an OpenGL extension function for use with the current OpenGL rendering context.


PROC wglGetProcAddress(
  LPCSTR unnamedParam1



Points to a null-terminated string that is the name of the extension function. The name of the extension function must be identical to a corresponding function implemented by OpenGL.

Return value

When the function succeeds, the return value is the address of the extension function.

When no current rendering context exists or the function fails, the return value is NULL. To get extended error information, call GetLastError.


The OpenGL library supports multiple implementations of its functions. Extension functions supported in one rendering context are not necessarily available in a separate rendering context. Thus, for a given rendering context in an application, use the function addresses returned by the wglGetProcAddress function only.

The spelling and the case of the extension function pointed to by lpszProc must be identical to that of a function supported and implemented by OpenGL. Because extension functions are not exported by OpenGL, you must use wglGetProcAddress to get the addresses of vendor-specific extension functions.

The extension function addresses are unique for each pixel format. All rendering contexts of a given pixel format share the same extension function addresses.


Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header wingdi.h
Library Opengl32.lib
DLL Opengl32.dll

See also

OpenGL on Windows

WGL Functions