QT dynamic translation of Chinese and English languages

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Update time ：2021-04-21

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The interface program is suitable for users in many countries , There will be a choice of language .
design sketch ：

The translation is divided into several parts ：
1. First determine the position of the string you want to translate
2. stay pro Add... To the document ：TRANSLATIONS = chinese.ts
Open the compiler you are using cmd, Switch to project path . And implement ：lupdate.exe xxx.pro obtain ts file

3. Use linguist.exe Open generated ts file , And add the Chinese you want to translate .
4. After translation , choice – file – Also published as – Save to local qm File can .

Code using ：
The header file ：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QDebug>
#include <QTranslator> //  internationalization 
#include <QLibraryInfo> //  internationalization 

namespace Ui {
    
class Widget;
}

class Widget : public QWidget
{
    
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

private slots:
    void on_comboBox_currentIndexChanged(int index);


private:
    Ui::Widget *ui;
    QTranslator tran;

};

#endif // WIDGET_H

cpp file ：

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    
    ui->setupUi(this);

}

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

// Load translation qm file 
void Widget::on_comboBox_currentIndexChanged(int index)
{
    
    if(ui->comboBox->currentIndex()==1)
    {
    
        tran.load(":/lang/chinese.qm");
        qApp->installTranslator(&tran);
    }else
    {
    
        qApp->removeTranslator(&tran);
    }
    ui->retranslateUi(this);

}

Here I just translate and use . There are lots of holes in it . I'll update it later .
I've only done Chinese and English translation here . If there are other languages that need corresponding qm File for translation . Here still suggest that you should learn English well . Purring .