windows api+opencv实现动态截屏并显示

先上效果



下面是实现代码

#include "stdafx.h"
#include "cv.h"
#include "highgui.h"

using namespace cv;

void Screen();
BOOL HBitmapToMat(HBITMAP& _hBmp,Mat& _mat);
HBITMAP hBmp;
HBITMAP hOld;

void main()
{

while(1)
{

Mat src;
Mat dst;
//屏幕截图
Screen();

//类型转换
HBitmapToMat(hBmp,src);

//调整大小
resize(src,dst,cvSize(1200,800),0,0);

imshow("dst",dst);
DeleteObject(hBmp);
waitKey(200);//这里调节帧数 现在200ms是5帧

}

}

//抓取当前屏幕函数
void Screen(){

//创建画板
HDC hScreen = CreateDC("DISPLAY", NULL, NULL, NULL);
HDC hCompDC = CreateCompatibleDC(hScreen);
//取屏幕宽度和高度
int nWidth = GetSystemMetrics(SM_CXSCREEN);
int nHeight = GetSystemMetrics(SM_CYSCREEN);
//创建Bitmap对象
hBmp = CreateCompatibleBitmap(hScreen, nWidth, nHeight);
hOld = (HBITMAP)SelectObject(hCompDC, hBmp);
BitBlt(hCompDC, 0, 0, nWidth, nHeight, hScreen, 0, 0, SRCCOPY);
SelectObject(hCompDC, hOld);
//释放对象
DeleteDC(hScreen);
DeleteDC(hCompDC);

}

//把HBITMAP型转成Mat型
BOOL HBitmapToMat(HBITMAP& _hBmp,Mat& _mat)

{
//BITMAP操作
BITMAP bmp;
GetObject(_hBmp,sizeof(BITMAP),&bmp);
int nChannels = bmp.bmBitsPixel == 1 ? 1 : bmp.bmBitsPixel/8 ;
int depth = bmp.bmBitsPixel == 1 ? IPL_DEPTH_1U : IPL_DEPTH_8U;
//mat操作
Mat v_mat;
v_mat.create(cvSize(bmp.bmWidth,bmp.bmHeight), CV_MAKETYPE(CV_8U,nChannels));
GetBitmapBits(_hBmp,bmp.bmHeight*bmp.bmWidth*nChannels,v_mat.data);
_mat=v_mat;
return TRUE;
}声明:转载请声明出处,本人入门级菜鸟,有问题大佬多多指教:QQ941131649