利用qt提供的函數實現截屏:

QPixmap QPixmap::grabWindow(WID window, int x = 0, int y = 0, int width = -1, int height = -1)

window: 表示窗口ID號

x、y: 截取屏幕的其實坐標

width:截取屏幕的寬度 -1表示當前窗口寬度

height:截取屏幕的高度 -1表示當前窗口高度
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示例：QString fileName;QPixmap pixmap;QPixmap pix;//pix = pixmap.grabWindow(this->winId(), 0, 0, -1, -1); // 獲取當前窗口pix = pixmap.grabWindow(QApplication::desktop()->winId()); // 獲取整個屏幕窗口// 當前時間命名fileName = QDateTime::currentDateTime().toString("yyyy-mm-dd hh-mm-ss")  + ".bmp";if (pix.isNull()){QMessageBox::information(this, "error", "grab Screen failed!", QMessageBox::Ok);}else{if (!pix.save("../screen/" + fileName, "BMP")){QMessageBox::information(this, "right", "save error!", QMessageBox::Ok);}else{QMessageBox::information(this, "Grab", "save successful!", QMessageBox::Ok);}}