Example of OpenGL Context Creation

LRESULT GLWindow::WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
    case WM_CREATE:
        {
            if(!m_hdc)
            {
                m_hdc = GetDC(hWnd);
            }
            SetupPixelFormat();

            if(!m_hglrc)
            {
                int attribs[] = {
                    WGL_CONTEXT_MAJOR_VERSION_ARB, 3,
                    WGL_CONTEXT_MINOR_VERSION_ARB, 0,
                    0};

                HGLRC tmpContext;
                if(!(tmpContext = wglCreateContext(m_hdc)))
                {
                    MessageBox(NULL, L"Can't create temp context", NULL, MB_OK);
                }
                if(!wglMakeCurrent(m_hdc, tmpContext))
                {
                    MessageBox(NULL, L"Can't make temp context current", NULL, MB_OK);
                }

                wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");
                if(!wglCreateContextAttribsARB)
                { // If wgl_create_context doesn't exist.
                    m_hglrc = tmpContext;
                    tmpContext = NULL;
                }
                else
                { // If wgl_create_context exists.
                    m_hglrc = wglCreateContextAttribsARB(m_hdc, 0, attribs);
                    if(!m_hglrc)
                    { // If trying a higher OpenGL version fails. (Maybe try to query for a lower OpenGL version this way? Is there a point?)
                        m_hglrc = tmpContext;
                        tmpContext = NULL;
                    }
                    // Everything is looking good, use it and delete the old context.
                    wglDeleteContext(tmpContext);
                    tmpContext = NULL;
                    wglMakeCurrent(m_hdc, m_hglrc);
                }
            }
            m_isRunning = true;
        }
        break;