QT实现截图功能并识别其中的二维码代码,C代码库,德仔网

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【C】 QT实现截图功能并识别其中的二维码
作者:theboy / 发布于2013/7/1/ 2312

	/*

	1.按下ctrl+alt+z截图
	2.按下ctrl+alt+x识别二维码
	3.按下ctrl+alt+s保存图片

	使用了zxing库实现二维码识别
	使用QT第三方库libQtx中的QxtGlobalShortcut实现监听全局热键*/

	

	#include "mainwindow.h"
	#include "ui_mainwindow.h"

	MainWindow::MainWindow(QWidget *parent) :
	 QMainWindow(parent),
	 ui(new Ui::MainWindow)
	{
	 this->setWindowTitle("BusyBoy.snap with qr[按下H键显示帮助]");
	 setMinimumSize(360, 80);
	 setWindowIcon(QIcon(":images/icon"));
	 clipboard = QApplication::clipboard();
	 QxtGlobalShortcut *sc_z = new QxtGlobalShortcut(QKeySequence("Ctrl+Alt+Z"), this);
	 connect(sc_z, SIGNAL(activated()),
	 this, SLOT(onSnap()));
	 QxtGlobalShortcut *sc_x = new QxtGlobalShortcut(QKeySequence("Ctrl+Alt+X"), this);
	 connect(sc_x, SIGNAL(activated()),
	 this, SLOT(onQr()));
	 QxtGlobalShortcut *sc_s = new QxtGlobalShortcut(QKeySequence("Ctrl+Alt+S"), this);
	 connect(sc_s, SIGNAL(activated()),
	 this, SLOT(onSave()));
	 QxtGlobalShortcut *sc_c = new QxtGlobalShortcut(QKeySequence("Ctrl+Alt+C"), this);
	 connect(sc_c, SIGNAL(activated()),
	 this, SLOT(genQr()));

	 label = new QLabel(this);
	 infoLabel = new QLabel(this);
	 helpMsg.append("按下Ctrl+Alt+Z截图\n");
	 helpMsg.append("按下Ctrl+Alt+X识别二维码\n");
	 helpMsg.append("按下Ctrl+Alt+S保存图片\n");
	 helpMsg.append("按下h显示本帮助\n");
	 helpMsg.append("Esc退出本程序\n");
	 infoLabel->setText(helpMsg);
	 infoLabel->adjustSize();
	 isOnSnapping = false;
	 rubberBand = new QRubberBand(QRubberBand::Rectangle, label);
	 isLeftButtonPressed = false;

	 iMsg.append("原谅我这一生不羁放纵爱自由!");
	}

	MainWindow::~MainWindow()
	{
	 delete ui;
	}

	void MainWindow::keyPressEvent(QKeyEvent *ev){
	 if(ev->key() == Qt::Key_Escape){
	 if(isOnSnapping == true){
	 this->showNormal();
	 isOnSnapping = false;
	 }else if(isOnSnapping == false){
	 QApplication::exit(0);
	 }
	 }else if(ev->key() == Qt::Key_H){
	 this->showNormal();
	 label->setText(helpMsg);
	 label->adjustSize();
	 infoLabel->hide();
	 this->adjustSize();
	 }else if(ev->key() == Qt::Key_I){
	 QMessageBox::about(this,"i", iMsg);
	 }
	}

	void MainWindow::onSnap(){
	 fullScreen = QPixmap::grabWindow(QApplication::desktop()->winId());
	 this->showNormal();
	 this->showFullScreen();
	 label->setPixmap(fullScreen);
	 label->show();
	 label->adjustSize();
	 isOnSnapping = true;

	}

	void MainWindow::mouseMoveEvent(QMouseEvent *ev){
	 QPoint pos = ev->pos();

	 // 截图状态显示截图信息
	 if(isOnSnapping){
	 int x = pos.x();
	 int y = pos.y();
	 int w = infoLabel->width();
	 int h = infoLabel->height();

	 QString info = "";
	 info.append("x:").append(QString::number(start.x()));
	 info.append("\ny:").append(QString::number(start.y()));
	 info.append("\n*\nwidth:").append(QString::number(pos.x() - start.x()));
	 info.append("\nheight:").append(QString::number(pos.y() - start.y()));

	 infoLabel->setText(info);
	 infoLabel->setGeometry(QRect(x, y, w, h));
	 infoLabel->adjustSize();
	 infoLabel->setStyleSheet("background:#eaeaea;");
	 infoLabel->show();
	 }else{
	 infoLabel->hide();
	 }
	 if(ev->type() == QEvent::MouseMove&&
	 isLeftButtonPressed){
	 if(rubberBand){
	 rubberBand->setGeometry(QRect(start, ev->pos()).normalized());
	 rubberBand->show();
	 }
	 }
	}

	void MainWindow::mousePressEvent(QMouseEvent *ev){
	 if(ev->button() == Qt::LeftButton&&
	 ev->type() == QEvent::MouseButtonPress&&
	 isOnSnapping){
	 isLeftButtonPressed = true;
	 start = ev->pos();
	 if(!rubberBand){
	 rubberBand = new QRubberBand(QRubberBand::Rectangle,
	 label);
	 }
	 rubberBand->setGeometry(QRect(start, QSize()));
	 rubberBand->show();
	 }
	}
	void MainWindow::mouseReleaseEvent(QMouseEvent *ev){
	 if(isLeftButtonPressed&&
	 isOnSnapping){
	 isLeftButtonPressed = false;
	 end = ev->pos();
	 QPixmap pixmap = fullScreen.copy(QRect(start, end));
	 clipboard->setImage(pixmap.toImage());
	 this->showNormal();
	 label->setPixmap(pixmap);
	 label->adjustSize();
	 this->resize(label->size());
	 rubberBand->hide();
	 isOnSnapping = false;
	 }
	}

	void MainWindow::onQr(){
	 QPixmap pixmap = fullScreen.copy(QRect(start, end));
	 if(pixmap.isNull()){
	 QMessageBox::warning(this, "提示", "还未截图");
	 }else{
	 QZXing decoder;
	 QString qrmsg = decoder.decodeImage(pixmap.toImage());
	 if(qrmsg.isEmpty()){
	 QMessageBox::warning(this, "识别失败", "请截取完整的二维码");
	 }else{
	 QMessageBox::information(this, "识别成功-已经复制到剪切板",qrmsg);
	 clipboard->setText(qrmsg);
	 }
	 }
	}

	void MainWindow::onSave(){
	 QPixmap pixmap = fullScreen.copy(QRect(start, end));
	 if(pixmap.isNull()){
	 QMessageBox::warning(this, "提示", "还未截图");
	 }else{
	 QString savePath = QFileDialog::getSaveFileName(this,
	 tr("Open Image"),
	 ".",
	 tr("Image Files(*.jpg,*.png,*.bmp)"));
	 if(savePath.endsWith(".png") ||
	 savePath.endsWith(".jpg") ||
	 savePath.endsWith(".bmp")){

	 }else{
	 if(QFileInfo(savePath).fileName().isEmpty()){
	 savePath += "image";
	 }
	 savePath.append(".png");
	 }
	 QFileInfo finfo(savePath);
	 if(finfo.exists()){
	 QMessageBox::StandardButton reply =
	 QMessageBox::question(this,"提示","["+finfo.fileName()+"]文件已经存在是否要覆盖?",
	 QMessageBox::Yes |
	 QMessageBox::No);
	 if(reply == QMessageBox::No){
	 return;
	 }
	 }
	 pixmap.save(savePath);
	 }
	}

	void MainWindow::genQr(){
	// qDebug()<<"gen qr";
	// QString qrmsg = clipboard->text();
	// if(qrmsg.isEmpty()){
	// QMessageBox::warning(this, "提示", "请先将信息复制到剪切板中.");
	// return;
	// }
	// qDebug()<<qrmsg;
	}

	

	mainwindow.h

	

	#ifndef MAINWINDOW_H
	#define MAINWINDOW_H

	#include <QMainWindow>
	#include <QtGui>
	#include <QKeyEvent>
	#include <QMouseEvent>
	#include <QDebug>
	#include <QPoint>

	#include "qxtglobalshortcut/qxtglobalshortcut.h"
	#include "QZXing.h"

	namespace Ui {
	class MainWindow;
	}

	class MainWindow : public QMainWindow
	{
	 Q_OBJECT
	
	public:
	 explicit MainWindow(QWidget *parent = 0);
	 ~MainWindow();
	
	private:
	 Ui::MainWindow *ui;
	 QLabel *label;
	 QLabel *infoLabel;
	 bool isOnSnapping;
	 QPixmap fullScreen;
	 QString helpMsg;
	 QString iMsg;

	 QPoint start;
	 QPoint end;
	 bool isLeftButtonPressed;
	 QRubberBand *rubberBand;

	 QClipboard *clipboard;

	 void keyPressEvent(QKeyEvent *ev);
	 void mouseMoveEvent(QMouseEvent *ev);
	 void mousePressEvent(QMouseEvent *ev);
	 void mouseReleaseEvent(QMouseEvent *ev);

	private slots:
	 void onSnap();
	 void onQr();
	 void onSave();
	 void genQr();
	};

	#endif // MAINWINDOW_H

	

	代码

	

	QT += core gui

	TARGET = QReader
	TEMPLATE = app
	RC_FILE += logo.rc
	CONFIG += -static

	include(qxtglobalshortcut/qxtglobalshortcut.pri)
	win32{
	 INCLUDEPATH += D:/lib/qt/xzing
	 LIBS += -LD:/lib/qt/xzing \
	 -lQZXing1
	}

	SOURCES += main.cpp\
	 mainwindow.cpp

	HEADERS += mainwindow.h

	FORMS += mainwindow.ui

	RESOURCES += \
	 res.qrc
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