OpenGL程序即使在一切正常的情况下也无法按预期工作

以下是我正在使用和处理的内容：

• 操作系统 - 视窗 7 64 位
• IDE - Visual Studio 2010 Professional
• 使用Visual Studio中已经存在的基本lib文件在OpenGL上工作，即"opengl32.lib"glu32.lib"和"gl.h"glu.h"

以下是我尝试执行的代码：

//
// GLSAMPLE.CPP
//  by Blaine Hodge
//
// Includes
#include <windows.h>
#include <gl/gl.h>
#include <gl/GLU.h>
// Function Declarations
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC);
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC);
// WinMain
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 
               LPSTR lpCmdLine, int iCmdShow)
{
WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL quit = FALSE;
float theta = 0.0f;
// register window class
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = "GLSample";
RegisterClass( &wc );
// create main window
hWnd = CreateWindow( 
    "GLSample", "OpenGL Sample", 
    WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
    0, 0, 256, 256,
    NULL, NULL, hInstance, NULL );
// enable OpenGL for the window
EnableOpenGL( hWnd, &hDC, &hRC );
// program main loop
while ( !quit )
{
    // check for messages
    if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE )  )
    {
        // handle or dispatch messages
        if ( msg.message == WM_QUIT ) 
        {
            quit = TRUE;
        } 
        else 
        {
            TranslateMessage( &msg );
            DispatchMessage( &msg );
        }
    } 
    else 
    {
        // OpenGL animation code goes here
        glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
        glClear( GL_COLOR_BUFFER_BIT );
        glPushMatrix();
        glRotatef( theta, 0.0f, 0.0f, 1.0f );
        glBegin( GL_TRIANGLES );
        glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f );
        glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f );
        glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f );
        glEnd();
        glPopMatrix();
        SwapBuffers( hDC );
        theta += 1.0f;
    }
}
// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );
// destroy the window explicitly
DestroyWindow( hWnd );
return msg.wParam;
}
// Window Procedure
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
    return 0;
case WM_CLOSE:
    PostQuitMessage( 0 );
    return 0;
case WM_DESTROY:
    return 0;
case WM_KEYDOWN:
    switch ( wParam )
    {
    case VK_ESCAPE:
        PostQuitMessage(0);
        return 0;
    }
    return 0;
default:
    return DefWindowProc( hWnd, message, wParam, lParam );
}
}
// Enable OpenGL
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int format;
// get the device context (DC)
*hDC = GetDC( hWnd );
// set the pixel format for the DC
ZeroMemory( &pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
format = ChoosePixelFormat( *hDC, &pfd );
SetPixelFormat( *hDC, format, &pfd );
// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );
}
// Disable OpenGL
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}

以下是预期输出的链接：

• http://www.nullterminator.net/glsample.gif

我在执行时得到什么：

• 空白的黑色控制台屏幕。

重要提示：

• 在项目属性的输入部分添加了opengl32.lib，glu32.lib。
• 驱动程序已更新

所以谁能告诉我这里出了什么问题。还有一件事是我已经下载了这段代码，而不是自己编写的，这是它的链接 http://www.nullterminator.net/opengl32.html