获取图像的像素颜色

我想获取图像像素的R，G和B的值。我已经用HDC完成了，但现在我想用Gdi+和输入图像来完成它。

这是我到目前为止的代码：

#include <iostream>
#include <stdlib.h>
#include <windows.h>
#include "gdiplus.h"
#include "stdio.h"
#include "iostream"
using namespace Gdiplus;
using namespace std;
void main(int argc, char* argv[])
{
Bitmap* mybitmap = new("bink.bmp");
int x=0;
int y=0;
Color pixelColor;
//Color pixelcolor[1000][1000];
for ( x = 0; x < 640; x++ )
   {
      for ( y = 0; y < 480; y++ )
      {
             //Color pixelColor[x][y] = mybitmap->GetPixel(x,y);
         mybitmap->GetPixel(x,y, &pixelColor);
         cout << "Pixel color " << x << ",  " << y; "is  " << pixelColor;
         //cout << "Pixel color " << x << ",  " << y; "is  " << pixelColor[x][y];
      }
   }
}

它不起作用...你能帮上什么忙吗？