void MainWindow::grapWindowScreen()
{if (!fullScreenLabel){fullScreenLabel = new QLabel();}//获取全屏截图fullScreenPixmap，并将其放入fullScreenLabelQScreen *screen = QGuiApplication::primaryScreen();fullScreenPixmap = screen->grabWindow(QApplication::desktop()->winId());fullScreenLabel->setPixmap(fullScreenPixmap);//label全屏显示fullScreenLabel->showFullScreen();
}

//事件过滤器，在全屏的截图上截取想要的部分
bool MainWindow::eventFilter(QObject *o, QEvent *e)
{if (o != fullScreenLabel){return MainWindow::eventFilter(o, e);}QMouseEvent *mouseEvent = static_cast<QMouseEvent*> (e);//true 鼠标左键按下且按键还未弹起if ((mouseEvent->button() == Qt::LeftButton)&& (mouseEvent->type() == QEvent::MouseButtonPress)){//鼠标左键标志位按下leftMousePress = true;//获取鼠标点origin = mouseEvent->pos();if (!rubberBand){rubberBand = new QRubberBand(QRubberBand::Rectangle, fullScreenLabel);}rubberBand->setGeometry(QRect(origin,QSize()));rubberBand->show();return true;}//true 鼠标左键按下并拖动if ((mouseEvent->type() == QEvent::MouseMove)&& (leftMousePress)){if (rubberBand){rubberBand->setGeometry(QRect(origin, mouseEvent->pos()).normalized());}return true;}//鼠标左键松开if ((mouseEvent->button() == Qt::LeftButton)&& (mouseEvent->type() == QEvent::MouseButtonRelease)){//鼠标标志位弹起leftMousePress = false;if (rubberBand){//获取橡皮筋框的终止坐标termination = mouseEvent->pos();rect = QRect(origin, termination);rubberBand->hide(); //把橡皮筋窗口隐藏//根据橡皮筋框截取全屏上的信息，并将其放入shotScreenLabelshotScreenPixmap = fullScreenPixmap.grabWidget(fullScreenLabel,rect.x(),rect.y(),rect.width(),rect.height());shotScreenPixmap.save("tmp.jpg"); //不会QPixmap转QImage或Mat只好出此下策
fullScreenLabel->hide();findDifference(); //找不同的处理过程if(!bNeedLocation) //不需要重新锁定表示结果有效，这时显示结果
            {//将shotScreenLabel的用户区大小固定为所截图片大小shotScreenLabel->setFixedSize(showDifferenceImage.width(), showDifferenceImage.height());shotScreenLabel->setPixmap(QPixmap::fromImage(showDifferenceImage));shotScreenLabel->show();}}return true;}return false;
}

//查找垂直的匹配线
void findFitLineVertical(Mat src, int y, int& fit_y)
{fit_y = y; //初始化为y
    Mat src2;src.copyTo(src2);int different_num = src.size().height;for(int c = src.size().width * 0.4 + 1; c < src.size().width; c++) //遍历垂直方向的线条
    {int different_num_tmp = 0;for(int r = 0; r < src.size().height; r++) //遍历线条上的每个点
        {int d = 0;for(int k = 0; k < 3; k++){d += abs(src.at<Vec3b>(r, c)[k] - src.at<Vec3b>(r, y)[k]);}if(d > 10)  //很关键，要允许有少量的噪声 否则误差很大different_num_tmp++;}if(different_num_tmp < different_num){different_num = different_num_tmp;fit_y = c;//line( src2, Point(c, 0), Point(c, src.size().height - 1), Scalar(0,255,0), 3, 8 );//imshow("pic2", src2);//cvWaitKey(15);
        }}return;
}

const int N = 8; //需要匹配的线条数int s = src.size().width *0.1; //测试线条的开始列int e = src.size().width * 0.4; //测试线条的结束列int gap = (e - s + 1) / (N - 1); //测试线条取样间隔int dis = 0;  //两幅图的横向间隔int disnum = 0;for(int i = 0; i < N; i++){int dis_tmp = 0;int y = s + i * gap;//line( src2, Point(y, 0), Point(y, src.size().height - 1), Scalar(255,0,0), 3, 8 );//imshow("pic1", src2);int fit_y;findFitLineVertical(src, y, fit_y);//下面这段通过典型的找数组中出现超过一半的数字的算法来找两幅图的横向间隔dis_tmp = fit_y - y;if(disnum == 0){dis = dis_tmp;disnum++;}else{if(dis_tmp == dis)disnum++;elsedisnum--;}//printf("%d, %d, %d\n", y, fit_y, fit_y - y);//line( src2, Point(fit_y, 0), Point(fit_y, src.size().height - 1), Scalar(0,255,0), 3, 8 );//imshow("pic1", src2);//cvWaitKey(0);}

// Load an imageMat srcRGB = imread("tmp.jpg");Mat srcRotate;//imshow("src", srcRGB);bool bRotate= false; //图片是否经过旋转//int left1, left2, right1, right2, up, down;bool b1 = findLeftRightBoard(srcRGB, left1, right1, left2, right2);if(!b1) //第一次没有找到匹配线 有可能是因为两张图是上下存放的 我们把图片旋转一下 再试试
        {srcRotate = rotateImage(srcRGB);srcRGB.release();srcRotate.copyTo(srcRGB);bRotate = true;}b1 = findLeftRightBoard(srcRGB, left1, right1, left2, right2);bNeedLocation |= (!b1);if(bNeedLocation) //如果两个方向都失败了 需要重新锁定
        {QMessageBox::warning(this, tr("error"), tr("Please locate again!\n图片不理想，请重新锁定！"));return;}findUpDownBoard(srcRGB, left1, right1, left2, right2, up,  down);

QImage const copy_mat_to_qimage(cv::Mat const &mat, QImage::Format format){QImage image(mat.cols, mat.rows, format);for (int i = 0; i != mat.rows; ++i){memcpy(image.scanLine(i), mat.ptr(i), image.bytesPerLine() );}return image;}QImage const mat_to_qimage_cpy(cv::Mat &mat)
{if(mat.type() == CV_8UC3){cv::cvtColor(mat, mat, CV_BGR2RGB);return copy_mat_to_qimage(mat, QImage::Format_RGB888);}if(mat.type() == CV_8U){return copy_mat_to_qimage(mat, QImage::Format_Indexed8);}return QImage();
}

        Mat mSub = abs((img1 - img2)) > 30;Mat gray;cvtColor(mSub, gray, CV_RGB2GRAY);gray = gray > 0;erode(gray, gray, Mat());dilate(gray, gray, Mat());erode(gray, gray, Mat());dilate(gray, gray, Mat());
//连通区域提取相关vector<vector<Point> > contours;vector<Vec4i> hierarchy;//连通区域提取
        findContours(gray, contours, hierarchy, CV_RETR_CCOMP , CV_CHAIN_APPROX_NONE );for(int i = 0; i < contours.size(); i++){if(contours[i].size() >= 4) // 点数大于等于 的连通区域才考虑
            {Rect r = boundingRect(contours[i]);rectangle(img1, r, Scalar(255,0,255), 2); //画出连通区域
            }}//结果转换为QImageif(!bRotate)showDifferenceImage = mat_to_qimage_cpy(img1);else  //如果旋转过，需要再转270恢复原来的方向
        {img1 = rotateImage(img1);img1 = rotateImage(img1);img1 = rotateImage(img1);showDifferenceImage = mat_to_qimage_cpy(img1);}

setWindowIcon(QIcon(":/pic/chaH.jpg"));

RC_ICONS = chaH2.ico

#include <windows.h>
#include "mainwindow.h"
#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();HWND p = FindWindowA(NULL, "大家来找茬");qDebug("p = %d\n",(int)p);// 获取屏幕鼠标坐标
    POINT pt;GetCursorPos(&pt);qDebug("%d %d\n",pt.x,pt.y);HWND h = WindowFromPoint(pt);qDebug("%d\n",h);//wchar_t text[200];//GetWindowText(h,text,200);//qDebug("%s\n",text);return a.exec();
}