使用Qt实现截图功能

2023-08-01 16:31| 来源: 网络整理| 查看: 265

文章目录使用Qt实现截图功能添加应用当前截图功能与信号详细代码

使用Qt实现截图功能

Qt截图有很多方法，这里不做详述，只用到截取整个屏幕的方法：

QScreen *screen = QGuiApplication::primaryScreen();

有时间还可以实现可以提取局部控件的截屏，这在一般的截图工具中都存在

参考链接：https://zhuanlan.zhihu.com/p/212230990

基本上就是使用该作者所写的内容，因为要把截图功能作为OCR软件中的一个模块，所以加了右键选项和一个信号，用于把结果发出来。

细节可以查看参考链接，这里不做详述。

添加应用当前截图功能与信号 //在右键弹出的菜单中添加一个按钮 menu->addAction("应用当前截图", this, SLOT(SelectScreen())); //定义一个信号，用于发出截屏的图像 signals: void sig_SelectImg(QImage img); //设置按钮的槽函数 void ScreenWidget::SelectScreen() { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; close(); QPixmap pix = fullScreen->copy(x, y, w, h); emit sig_SelectImg(pix.toImage()); } 详细代码

screen.h

#pragma once #pragma execution_character_set("utf-8") #include #include #include #include #include class Screen { public: enum STATUS {SELECT, MOV, SET_W_H}; Screen() {} Screen(QSize size); void setStart(QPoint pos); void setEnd(QPoint pos); QPoint getStart(); QPoint getEnd(); QPoint getLeftUp(); QPoint getRightDown(); STATUS getStatus(); void setStatus(STATUS status); int width(); int height(); bool isInArea(QPoint pos); // 检测pos是否在截图区域内 void move(QPoint p); // 按 p 移动截图区域 private: QPoint leftUpPos, rightDownPos; //记录截图区域左上角、右下角 QPoint startPos, endPos; //记录鼠标开始位置、结束位置 int maxWidth, maxHeight; //记录屏幕大小 STATUS status; //三个状态: 选择区域、移动区域、设置width height void cmpPoint(QPoint &s, QPoint &e);//比较两位置，判断左上角、右下角 };

screen.cpp

#pragma once #pragma execution_character_set("utf-8") #include "screen.h" #include #include #include #include #include #include #include #include Screen::Screen(QSize size) { maxWidth = size.width(); maxHeight = size.height(); startPos = QPoint(-1, -1); endPos = startPos; leftUpPos = startPos; rightDownPos = startPos; status = SELECT; } int Screen::width() { return maxWidth; } int Screen::height() { return maxHeight; } Screen::STATUS Screen::getStatus() { return status; } void Screen::setStatus(STATUS status) { this->status = status; } void Screen::setEnd(QPoint pos) { endPos = pos; leftUpPos = startPos; rightDownPos = endPos; cmpPoint(leftUpPos, rightDownPos); } void Screen::setStart(QPoint pos) { startPos = pos; } QPoint Screen::getEnd() { return endPos; } QPoint Screen::getStart() { return startPos; } QPoint Screen::getLeftUp() { return leftUpPos; } QPoint Screen::getRightDown() { return rightDownPos; } bool Screen::isInArea(QPoint pos) { if (pos.x() > leftUpPos.x() && pos.x() < rightDownPos.x() && pos.y() > leftUpPos.y() && pos.y() < rightDownPos.y()) { return true; } return false; } void Screen::move(QPoint p) { int lx = leftUpPos.x() + p.x(); int ly = leftUpPos.y() + p.y(); int rx = rightDownPos.x() + p.x(); int ry = rightDownPos.y() + p.y(); if (lx < 0) { lx = 0; rx -= p.x(); } if (ly < 0) { ly = 0; ry -= p.y(); } if (rx > maxWidth) { rx = maxWidth; lx -= p.x(); } if (ry > maxHeight) { ry = maxHeight; ly -= p.y(); } leftUpPos = QPoint(lx, ly); rightDownPos = QPoint(rx, ry); startPos = leftUpPos; endPos = rightDownPos; } void Screen::cmpPoint(QPoint &leftTop, QPoint &rightDown) { QPoint l = leftTop; QPoint r = rightDown; if (l.x() setWindowFlags(Qt::Tool | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint | Qt::X11BypassWindowManagerHint); menu = new QMenu(this); menu->addAction("应用当前截图", this, SLOT(SelectScreen())); menu->addAction("保存当前截图", this, SLOT(saveScreen())); menu->addAction("保存全屏截图", this, SLOT(saveFullScreen())); menu->addAction("截图另存为 ", this, SLOT(saveScreenOther())); menu->addAction("全屏另存为 ", this, SLOT(saveFullOther())); // menu->addAction("退出截图", this, SLOT(hide())); menu->addAction("退出截图 ", this, SLOT(close())); screen = new Screen(QApplication::desktop()->size()); fullScreen = new QPixmap(); } void ScreenWidget::paintEvent(QPaintEvent *) { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; QPainter painter(this); QPen pen; pen.setColor(Qt::green); pen.setWidth(2); pen.setStyle(Qt::DotLine); painter.setPen(pen); painter.drawPixmap(0, 0, *bgScreen); if (w != 0 && h != 0) { painter.drawPixmap(x, y, fullScreen->copy(x, y, w, h)); } painter.drawRect(x, y, w, h); pen.setColor(Qt::yellow); painter.setPen(pen); painter.drawText(x + 2, y - 8, tr("截图范围：( %1 x %2 ) - ( %3 x %4 ) 图片大小：( %5 x %6 )") .arg(x).arg(y).arg(x + w).arg(y + h).arg(w).arg(h)); } void ScreenWidget::showEvent(QShowEvent *) { QPoint point(-1, -1); screen->setStart(point); screen->setEnd(point); #if (QT_VERSION grabWindow(QApplication::desktop()->winId(), 0, 0, screen->width(), screen->height()); #else QScreen *pscreen = QApplication::primaryScreen(); *fullScreen = pscreen->grabWindow(QApplication::desktop()->winId(), 0, 0, screen->width(), screen->height()); #endif //设置透明度实现模糊背景 QPixmap pix(screen->width(), screen->height()); pix.fill((QColor(160, 160, 160, 200))); bgScreen = new QPixmap(*fullScreen); QPainter p(bgScreen); p.drawPixmap(0, 0, pix); } void ScreenWidget::saveScreen() { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; QString fileName = QString("%1/screen_%2.png").arg(qApp->applicationDirPath()).arg(STRDATETIME); fullScreen->copy(x, y, w, h).save(fileName, "png"); close(); //QPixmap pix = fullScreen->copy(x, y, w, h); //emit sig_SelectImg(pix.toImage()); } void ScreenWidget::saveFullScreen() { QString fileName = QString("%1/full_%2.png").arg(qApp->applicationDirPath()).arg(STRDATETIME); fullScreen->save(fileName, "png"); close(); } void ScreenWidget::saveScreenOther() { QString name = QString("%1.png").arg(STRDATETIME); QString fileName = QFileDialog::getSaveFileName(this, "保存图片", name, "png Files (*.png)"); if (!fileName.endsWith(".png")) { fileName += ".png"; } if (fileName.length() > 0) { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; fullScreen->copy(x, y, w, h).save(fileName, "png"); close(); } } void ScreenWidget::saveFullOther() { QString name = QString("%1.png").arg(STRDATETIME); QString fileName = QFileDialog::getSaveFileName(this, "保存图片", name, "png Files (*.png)"); if (!fileName.endsWith(".png")) { fileName += ".png"; } if (fileName.length() > 0) { fullScreen->save(fileName, "png"); close(); } } void ScreenWidget::SelectScreen() { int x = screen->getLeftUp().x(); int y = screen->getLeftUp().y(); int w = screen->getRightDown().x() - x; int h = screen->getRightDown().y() - y; close(); QPixmap pix = fullScreen->copy(x, y, w, h); emit sig_SelectImg(pix.toImage()); } void ScreenWidget::mouseMoveEvent(QMouseEvent *e) { if (screen->getStatus() == Screen::SELECT) { screen->setEnd(e->pos()); } else if (screen->getStatus() == Screen::MOV) { QPoint p(e->x() - movPos.x(), e->y() - movPos.y()); screen->move(p); movPos = e->pos(); } this->update(); } void ScreenWidget::mousePressEvent(QMouseEvent *e) { int status = screen->getStatus(); if (status == Screen::SELECT) { screen->setStart(e->pos()); } else if (status == Screen::MOV) { if (screen->isInArea(e->pos()) == false) { screen->setStart(e->pos()); screen->setStatus(Screen::SELECT); } else { movPos = e->pos(); this->setCursor(Qt::SizeAllCursor); } } this->update(); } void ScreenWidget::mouseReleaseEvent(QMouseEvent *) { if (screen->getStatus() == Screen::SELECT) { screen->setStatus(Screen::MOV); } else if (screen->getStatus() == Screen::MOV) { this->setCursor(Qt::ArrowCursor); } } void ScreenWidget::contextMenuEvent(QContextMenuEvent *) { this->setCursor(Qt::ArrowCursor); menu->exec(cursor().pos()); }

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