QtQt5截取并保存.png,.bmp等格式图片

相关资料：

https://www.csdn.net/tags/NtjaMg5sNDQ5MDgtYmxvZwO0O0OO0O0O.html

代码实例：

.pro

 1 QT       += core gui
 2 
 3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 4 
 5 CONFIG += c++11
 6 
 7 # The following define makes your compiler emit warnings if you use
 8 # any Qt feature that has been marked deprecated (the exact warnings
 9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12 
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
17 
18 SOURCES += \
19     main.cpp \
20     mainwindow.cpp
21 
22 HEADERS += \
23     mainwindow.h
24 
25 FORMS += \
26     mainwindow.ui
27 
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target
32 
33 RESOURCES += \
34     QtSaveToPng.qrc

View Code

main.cpp

 1 #include "mainwindow.h"
 2 
 3 #include <QApplication>
 4 
 5 int main(int argc, char *argv[])
 6 {
 7     QApplication a(argc, argv);
 8     MainWindow w;
 9     w.show();
10     return a.exec();
11 }

View Code

mainwindow.h

 1 #ifndef MAINWINDOW_H
 2 #define MAINWINDOW_H
 3 
 4 #include <QMainWindow>
 5 #include <QDir>
 6 #include <QDateTime>
 7 #include <QFileDialog>
 8 
 9 QT_BEGIN_NAMESPACE
10 namespace Ui { class MainWindow; }
11 QT_END_NAMESPACE
12 
13 class MainWindow : public QMainWindow
14 {
15     Q_OBJECT
16 
17 public:
18     MainWindow(QWidget *parent = nullptr);
19     ~MainWindow();
20 
21 private slots:
22     void on_pushButton_clicked();
23 
24 private:
25     Ui::MainWindow *ui;
26 };
27 #endif // MAINWINDOW_H

View Code

mainwindow.cpp

  1 #include "mainwindow.h"
  2 #include "ui_mainwindow.h"
  3 
  4 MainWindow::MainWindow(QWidget *parent)
  5     : QMainWindow(parent)
  6     , ui(new Ui::MainWindow)
  7 {
  8     ui->setupUi(this);
  9     setWindowTitle(QStringLiteral("Qt5截取并保存.png,.bmp等格式图片"));
 10 }
 11 
 12 MainWindow::~MainWindow()
 13 {
 14     delete ui;
 15 }
 16 
 17 
 18 void MainWindow::on_pushButton_clicked()
 19 {
 20     QString fileName;
 21     QPixmap pix, bmp;
 22 
 23     QString strDir = QCoreApplication::applicationDirPath()+"\\截图\\";
 24     QDir dir(strDir);
 25 
 26     if(!dir.exists())
 27     {
 28         dir.mkdir(strDir);
 29     }
 30     fileName = strDir + QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")  + ".png";
 31     pix = QPixmap::grabWidget(this);
 32 
 33     //this->m_pixMap = QPixmap::grabWindow(QApplication::desktop()->winId(), 0, 0, -1, -1);
 34     //this->m_pixMap = QWidget::grab(QRect( QPoint( 0, 0 ), QSize( -1, -1 ) ));
 35 //    QScreen* screen = QGuiApplication::primaryScreen();
 36 //    this->m_pixMap = screen->grabWindow(QApplication::desktop()->winId(), 0, 0, -1, -1);
 37 //    使用QWidget::grab再QT5中会有警告
 38 //    this function is deprecated, use QScreen::grabWindow() instead. Defaulting to primary screen.
 39 
 40 //    使用第二种只截取当前App的界面，非桌面全屏
 41 //    使用第三种没有警告，且截取的是桌面全屏
 42     QString strFile = QFileDialog::getSaveFileName(this,"保存图片",fileName,"PNG(*.png);;BMP(*.bmp);;JPG(*.jpg)");
 43     if(!strFile.isNull())
 44     {
 45         pix.save(strFile);
 46     }
 47 } 
 48 
 49 void MainWindow::on_pushButton_2_clicked()
 50 {
 51     QString fileName;
 52     QPixmap pix, bmp;
 53 
 54     QString strDir = QCoreApplication::applicationDirPath()+"\\截图\\";
 55     QDir dir(strDir);
 56 
 57     if(!dir.exists())
 58     {
 59         dir.mkdir(strDir);
 60     }
 61     fileName = strDir + QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")  + ".png";
 62 
 63     QScreen* screen = QGuiApplication::primaryScreen();
 64     pix = screen->grabWindow(QApplication::desktop()->winId(),  0, 0, -1, -1);
 65 
 66     QString strFile = QFileDialog::getSaveFileName(this,"保存图片",fileName,"PNG(*.png);;BMP(*.bmp);;JPG(*.jpg)");
 67     if(!strFile.isNull())
 68     {
 69         pix.save(strFile);
 70     }
 71 }
 72 
 73 void MainWindow::on_pushButton_3_clicked()
 74 {
 75     QString fileName;
 76     QPixmap pix, bmp;
 77 
 78     QString strDir = QCoreApplication::applicationDirPath()+"\\截图\\";
 79     QDir dir(strDir);
 80 
 81     if(!dir.exists())
 82     {
 83         dir.mkdir(strDir);
 84     }
 85     fileName = strDir + QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")  + ".png";
 86 
 87     pix = QWidget::grab(QRect( QPoint( 0, 0 ), QSize( -1, -1 ) ));
 88 
 89     QString strFile = QFileDialog::getSaveFileName(this,"保存图片",fileName,"PNG(*.png);;BMP(*.bmp);;JPG(*.jpg)");
 90     if(!strFile.isNull())
 91     {
 92         pix.save(strFile);
 93     }
 94 }
 95 
 96 void MainWindow::on_pushButton_4_clicked()
 97 {
 98     QImage  image1;
 99     QImage  image2;
100     QImage  image3;
101 
102     image1.load(":/new/prefix1/J10.png");
103     image2.load(":/new/prefix1/J20.png");
104     image3.load("::/new/prefix1/J16.png");
105 
106     QString fileName;
107     QPixmap pix, bmp;
108 //    QImage pix, bmp;
109 
110     QString strDir = QCoreApplication::applicationDirPath()+"\\截图\\";
111     QDir dir(strDir);
112 
113     if(!dir.exists())
114     {
115         dir.mkdir(strDir);
116     }
117     fileName = strDir + QDateTime::currentDateTime().toString("yyyy-MM-dd-HH-mm-ss")  + ".png";
118     pix.load(":/new/prefix1/J10.png");
119     QPainter painter(&pix);
120     painter.drawImage(QPoint(0, -10), image1);
121     painter.drawImage(QPoint(0, 5), image2);
122     painter.drawImage(QPoint(0, 10), image3);
123 
124     QString strFile = QFileDialog::getSaveFileName(this,"保存图片",fileName,"PNG(*.png);;BMP(*.bmp);;JPG(*.jpg)");
125     if(!strFile.isNull())
126     {
127         pix.save(strFile);
128     }
129 
130     ui->pushButton_5->setIcon(QIcon(pix));
131 }

View Code

mainwindow.ui

  1 <?xml version="1.0" encoding="UTF-8"?>
  2 <ui version="4.0">
  3  <class>MainWindow</class>
  4  <widget class="QMainWindow" name="MainWindow">
  5   <property name="geometry">
  6    <rect>
  7     <x>0</x>
  8     <y>0</y>
  9     <width>612</width>
 10     <height>293</height>
 11    </rect>
 12   </property>
 13   <property name="windowTitle">
 14    <string>MainWindow</string>
 15   </property>
 16   <widget class="QWidget" name="centralwidget">
 17    <widget class="QPushButton" name="pushButton">
 18     <property name="geometry">
 19      <rect>
 20       <x>430</x>
 21       <y>30</y>
 22       <width>131</width>
 23       <height>20</height>
 24      </rect>
 25     </property>
 26     <property name="text">
 27      <string>程序界面PNG图片</string>
 28     </property>
 29    </widget>
 30    <widget class="QLabel" name="label">
 31     <property name="geometry">
 32      <rect>
 33       <x>30</x>
 34       <y>20</y>
 35       <width>381</width>
 36       <height>231</height>
 37      </rect>
 38     </property>
 39     <property name="text">
 40      <string/>
 41     </property>
 42     <property name="pixmap">
 43      <pixmap resource="QtSaveToPng.qrc">:/new/prefix1/Earth_Color1_16k.jpeg</pixmap>
 44     </property>
 45     <property name="scaledContents">
 46      <bool>true</bool>
 47     </property>
 48    </widget>
 49    <widget class="QPushButton" name="pushButton_2">
 50     <property name="geometry">
 51      <rect>
 52       <x>430</x>
 53       <y>70</y>
 54       <width>131</width>
 55       <height>20</height>
 56      </rect>
 57     </property>
 58     <property name="text">
 59      <string>桌面界面PNG图片</string>
 60     </property>
 61    </widget>
 62    <widget class="QPushButton" name="pushButton_3">
 63     <property name="geometry">
 64      <rect>
 65       <x>430</x>
 66       <y>110</y>
 67       <width>131</width>
 68       <height>20</height>
 69      </rect>
 70     </property>
 71     <property name="text">
 72      <string>自定义定PNG图片</string>
 73     </property>
 74    </widget>
 75    <widget class="QPushButton" name="pushButton_4">
 76     <property name="geometry">
 77      <rect>
 78       <x>430</x>
 79       <y>150</y>
 80       <width>131</width>
 81       <height>20</height>
 82      </rect>
 83     </property>
 84     <property name="text">
 85      <string>多图合并</string>
 86     </property>
 87    </widget>
 88    <widget class="QPushButton" name="pushButton_5">
 89     <property name="geometry">
 90      <rect>
 91       <x>440</x>
 92       <y>200</y>
 93       <width>81</width>
 94       <height>61</height>
 95      </rect>
 96     </property>
 97     <property name="text">
 98      <string>PushButton</string>
 99     </property>
100    </widget>
101   </widget>
102  </widget>
103  <resources>
104   <include location="QtSaveToPng.qrc"/>
105  </resources>
106  <connections/>
107 </ui>

View Code

qrc文件不上传了。

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原文地址：https://www.cnblogs.com/FKdelphi/p/16520634.html