qt opencv 录屏代码

可以参考以下代码：

#include <opencv2/opencv.hpp>
#include <iostream>
#include <string>
#include <chrono>
#include <ctime>

using namespace cv;
using namespace std;

int main() {
    // 获取当前时间
    auto now = chrono::system_clock::now();
    auto now_c = chrono::system_clock::to_time_t(now);
    string path = "screen_capture_" + to_string(now_c) + ".avi";

    // 获取屏幕分辨率
    int screen_width = GetSystemMetrics(SM_CXSCREEN);
    int screen_height = GetSystemMetrics(SM_CYSCREEN);

    // 创建视频编码器
    VideoWriter writer(path, CV_FOURCC('M', 'J', 'P', 'G'), 30, Size(screen_width, screen_height));

    if (!writer.isOpened()) {
        cout << "无法打开视频文件" << endl;
        return -1;
    }

    // 录屏
    Mat frame;
    HDC hScreen = GetDC(NULL);
    HDC hDC = CreateCompatibleDC(hScreen);
    HBITMAP hBitmap = CreateCompatibleBitmap(hScreen, screen_width, screen_height);
    HGDIOBJ hOld = SelectObject(hDC, hBitmap);

    while (true) {
        if (!BitBlt(hDC, 0, 0, screen_width, screen_height, hScreen, 0, 0, SRCCOPY)) {
            cout << "无法复制位图" << endl;
            return -1;
        }

        frame.create(screen_height, screen_width, CV_8UC4);
        GetBitmapBits(hBitmap, screen_width * screen_height * 4, frame.data);

        writer.write(frame);

        if (waitKey(1) == 27) {
            break;
        }
    }

    // 释放资源
    SelectObject(hDC, hOld);
    DeleteObject(hBitmap);
    DeleteDC(hDC);
    ReleaseDC(NULL, hScreen);

    return 0;
}

希望能对您有所帮助。