我如何在'opencv'函数，当我构建隐藏窗口(在后台运行）时获得像素的颜色

我构建了一个在后台运行的程序，并检查两个图像是否相似。当我以标准跑步方式跑步时，它会做得很好。但当我想在隐藏窗口（在后台）中运行它时，我会收到以下错误：

1. 未解析的外部符号主控制台Application2

2. 未解析的外部控制台Application2

这是我的代码：

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <atlimage.h>
using namespace cv;
using namespace std;
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR     lpCmdLine, int nShowCmd) {
  int count_inequality = 0;
  Mat image, image2;
  image = imread("hh.jpg", IMREAD_COLOR); // Read thVec3b intensity =   img.at<Vec3b>(y, x);
  image2 = imread("gg.jpg", IMREAD_COLOR); // Read thVec3b intensity = img.at<Vec3b>(y, x);
  float blue;
  float green;
  float red;
  float blue2;
  float green2;
  float red2;
  for (int i = 1; i <= 1000; i+=10) {
      for (int h = 1; h <= 900; h += 10) {
        Vec3b intensity = image.at<Vec3b>(i, h);
        blue = intensity.val[0];
        green = intensity.val[1];
        red = intensity.val[2];
        Vec3b intensity2 = image2.at<Vec3b>(i, h);
        blue2 = intensity2.val[0];
        green2 = intensity2.val[1];
        red2 = intensity2.val[2];
        if (blue == blue2 && green == green2 && red == red2) {}
        else {
              count_inequality++;
              if (count_inequality == 3){
                  //Code what happens if will be 3 inequality.
              }
          }
        }
    }
return 0;
}

有人能帮我吗