Qt与国际化

原文地址：Qt与国际化

Qt国际化可能是我最喜的Qt功能。

国际化是多语言切换支持。

Qt实现国际化需要满足两个条件

1.所有Qstring字符串用tr()修饰。

2.导入翻译文件。

改造上一篇文章线程的例子，添加国际化支持：

http://www.cnblogs.com/hebaichuanyeah/p/5618781.html

把所有字符串全部用tr()修饰，增加一个语言切换下拉选项。

 

实现多语言支持，需要导入翻译文件，如何生成翻译文件？

1.在Qt工程文件中加入以下代码，代表生成两个翻译文件。

1 2	TRANSLATIONS += zh.ts \                en.ts

利用lupdate命令，或者QtCreator生成.ts的XML文件。

2.翻译修改.ts xml文件。修改格式如下：

3.运行lrelease命令生成二进制翻译文件.qm，并在程序中导入生成的.qm文件，即可自动翻译。

运行效果：

中文界面

英文界面

 thread.h

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

#include "QThread"   class Thread : public QThread {     Q_OBJECT public:     Thread();  //   void setMessage(const Qstring &message);     void setRun();     void stop();     bool getState(); protected:     void run(); private:    // QString messageStr;     volatile bool enable; signals:     void OutMessage(QString message); };

 thread.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

#include "thread.h"   Thread::Thread() {     enable = true; }   void Thread::run() {     while(true)     {         if(enable)         {             this->OutMessage(tr("I'm run : thread 1"));             msleep(2100);         }     } } void Thread::stop() {     enable = false; } void Thread::setRun() {     enable = true; } bool  Thread::getState() {     return enable; }

 mainwindow.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113

#include "mainwindow.h" #include <QPainter>     MainWindow :: MainWindow() {     mainWindow = new QWidget;     this->setCentralWidget(mainWindow);       backThread = new Thread();     backThread->start();       languageCombo = new QComboBox();     languageCombo->addItem(tr("english"));     languageCombo->addItem(tr("chinese"));     languageCombo->setStyleSheet("font-size : 15px");       clearButton = new QPushButton(tr("clear"));     clearButton->setSizePolicy(QSizePolicy::Fixed,QSizePolicy::Fixed);     clearButton->setStyleSheet("font-size : 15px");     runStopButton = new QPushButton(tr("stop"));     runStopButton->setStyleSheet("font-size : 15px");     messageEdit = new QTextEdit();     messageEdit->setReadOnly(true);     messageEdit->setStyleSheet("font-size : 17px");     mainLayout = new QGridLayout;       mainLayout->addWidget(messageEdit,0,0,5,5);     mainLayout->addWidget(clearButton,1,5,1,1);     mainLayout->addWidget(runStopButton,0,5,1,1);     mainLayout->addWidget(languageCombo,2,5,1,1);       mainWindow->setLayout(mainLayout);       QObject::connect(clearButton,SIGNAL(clicked()),this,SLOT(clearMessage()));     QObject::connect(runStopButton,SIGNAL(clicked()),this,SLOT(runStopThread()));     QObject::connect(languageCombo,SIGNAL(currentIndexChanged(int)),this,SLOT(languageChange(int)));       QObject::connect(backThread,SIGNAL(OutMessage(QString)),this,SLOT(updateMessage(QString)));       this->setWindowTitle(tr("thread test~"));     this->setStyleSheet("font-size : 15px");       this->resize(QSize(350,135));   }   MainWindow :: ~MainWindow() {     mainWindow->deleteLater();     mainLayout->deleteLater();     messageEdit->deleteLater();     clearButton->deleteLater();     runStopButton->deleteLater(); }   void MainWindow::updateMessage(QString message) {     messageEdit->append(message); } void MainWindow::clearMessage() {     messageEdit->clear(); } void MainWindow::runStopThread() {     if(backThread->getState())     {         backThread->stop();         runStopButton->setText(tr("run"));     }     else     {         backThread->setRun();         runStopButton->setText(tr("stop"));       }     } void MainWindow::languageChange(int index) {     switch(index)     {         case 0:             translator->load(QString("en.qm"));             break;         case 1:             translator->load(QString("zh.qm"));             break;     }     updateShow(); }   void MainWindow::setTranslate(QTranslator * tran) {     translator = tran; } void MainWindow::updateShow() {     if(!backThread->getState())     {         runStopButton->setText(tr("run"));     }     else     {         runStopButton->setText(tr("stop"));     }     setWindowTitle(tr("thread test~"));     clearButton->setText(tr("clear")); } void MainWindow::keyPressEvent(QKeyEvent * key) {     close(); }

 mainwindow.h

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

#ifndef MAINWINDOW_H #define MAINWINDOW_H     #include <QMainWindow> #include <QLabel> #include <QGridLayout> #include <QPushButton> #include <QTextEdit> #include <QDoubleValidator> #include <QComboBox> #include <QTranslator>   #include "thread.h"   #define PI  3.14592653589   class MainWindow  : public QMainWindow {     Q_OBJECT public:     MainWindow();     ~MainWindow();     void setTranslate(QTranslator * tran); private:     QWidget* mainWindow;     QGridLayout * mainLayout;     QTextEdit * messageEdit;     QPushButton * clearButton;     QPushButton * runStopButton;     Thread * backThread;     QComboBox * languageCombo;     QTranslator * translator;     void updateShow();     void keyPressEvent(QKeyEvent * key); private slots:     void updateMessage(QString message);     void clearMessage();     void runStopThread();     void languageChange(int index); };   #endif

 main.cpp

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

#include <QApplication> #include <QFont> #include <QTranslator> #include <QTextCodec> #include "mainwindow.h"   int main(int argc ,char* argv[]) {     QApplication app(argc,argv);       QTranslator translator;     translator.load(QString("zh.qm"));     app.installTranslator(&translator);       MainWindow myWindow;       myWindow.setTranslate(&translator);     myWindow.show();     return app.exec(); }