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WglGetProcAddress returns NULL

I tried to use WGL_ARB_pbuffer to render a screen with OpenGL,

but during initialization I failed. Here is my code.
wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) wglGetProcAddress("wglGetExtensionsStringARB");
if(!wglGetExtensionsStringARB) return;
const GLubyte* extensions = (const GLubyte*) wglGetExtensionsStringARB(wglGetCurrentDC());

So actually it ends on line 2 because wglGetExtensionsStringARB got NULL.

I have no idea why wglGetProcAddress is not working. I included "wglext.h" and also I defined as below in the header.
PFNWGLGETEXTENSIONSSTRINGARBPROC    pwglGetExtensionsStringARB = 0;
#define wglGetExtensionsStringARB   pwglGetExtensionsStringARB

Why can't I use wglGetProcAddress as I expected?
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1 answer

wglGetProcAddress OpenGL; wglCreateContext wglMakeCurrent wglGetProcAddress. OpenGL, wglGetProcAddress NULL. , OpenGL (, /), wglGetCurrentContext , NULL.

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