QT serial port UI design and solution to display Chinese garbled code

【1】UTF-8 and GBK

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*UTF-8：Unicode TransformationFormat-8bit, Allow to contain BOM, But it usually doesn't contain BOM.
Is used to solve the international character of a multi byte encoding , It uses English 8 position （ A byte ）, Use of Chinese 24 by （ Three bytes ） Encoding .
UTF-8 Contains characters needed in all countries of the world , It's international code , Strong commonality .
UTF-8 Coded text can be supported in various countries UTF8 The character set is displayed on the browser .
If it is UTF8 code , In foreigners' English IE It can also show Chinese on , They don't have to download IE Chinese language support package for .

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*GBK It's a national standard GB2312 On this basis, it is compatible after expansion GB2312 Standards for .
GBK The text encoding of is expressed in double bytes , That is to say, regardless of 、 English characters are represented by double bytes , In order to distinguish Chinese , Set the highest bit to 1.
GBK Contains all Chinese characters , It's the country code , Versatility is better than UTF8 Bad , however UTF8 The database occupied is more than GBD Big .
GBK yes GB2312 An extension of , In addition to compatibility GB2312 Outside , It can also display traditional Chinese , There are also Kanas in Japanese .
*GBK、GB2312 And so on UTF8 Between must pass through Unicode Code can be converted to each other ： GBK、GB2312－－Unicode－－UTF8
UTF8－－Unicode－－GBK、GB2312
* In simplified Chinese windows Under the system ,ANSI Code representative GBK/GB2312 code ,ANSI Usually use 0x80~0xFF Scope 2 In bytes 1 Chinese characters .
0x00~0x7F Characters between , Is still 1 One byte stands for 1 Characters .Unicode(UTF-16) Encoding is used for all characters 2 Byte representation .

【2】SerialTool.pro

【3】mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include<QSerialPort>// Serial header file 
#include<QTextCodec>
QT_BEGIN_NAMESPACE
namespace Ui {
     class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
    void InitUI();

private:
    Ui::MainWindow *ui;
    QTextCodec *codec;
};
#endif // MAINWINDOW_H

【4】mainwindow.cpp

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

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    
    ui->setupUi(this);
    setWindowTitle("Serial Tool");
    //codec = QTextCodec::codecForName("UTF-8");
    codec = QTextCodec::codecForName("GBK");//System( Simplified Chinese windows By default, the system refers to GBK code )
    QTextCodec::setCodecForLocale(codec);
    InitUI();// Initialize serial port 

}

MainWindow::~MainWindow()
{
    
    delete ui;
}
// Initialize control 
void MainWindow::InitUI()
{
    
    // Port name 
    for(int i=0;i<10;i++)
    {
    
        ui->CB_portname->addItem(QString("COM%1").arg(i));// To add text  【 Additional form 】
    }
    // Baud rate  【 Additional form 】
    ui->CB_btl->addItem(QString("1200") ,QSerialPort::Baud1200);
    ui->CB_btl->addItem(QString("2400") ,QSerialPort::Baud2400);
    ui->CB_btl->addItem(QString("4800") ,QSerialPort::Baud4800);
    ui->CB_btl->addItem(QString("9600") ,QSerialPort::Baud9600);
    ui->CB_btl->addItem(QString("19200") ,QSerialPort::Baud19200);
    ui->CB_btl->addItem(QString("115200") ,QSerialPort::Baud115200);

    // Data bits 
    ui->CB_databit->addItem(QString("5"),QSerialPort::Data5);
    ui->CB_databit->addItem(QString("6"),QSerialPort::Data6);
    ui->CB_databit->addItem(QString("7"),QSerialPort::Data7);
    ui->CB_databit->addItem(QString("8"),QSerialPort::Data8);
    // Parity bit 
    ui->CB_jioubit->addItem(codec->toUnicode(" nothing "),QSerialPort::NoParity);
    ui->CB_jioubit->addItem(codec->toUnicode(" p. "),QSerialPort::EvenParity);
    ui->CB_jioubit->addItem(codec->toUnicode(" accidentally "),QSerialPort::OddParity);

    // Stop bit 
    ui->CB_stopbit->addItem(QString("1"),QSerialPort::OneStop);
    ui->CB_stopbit->addItem(QString("1.5"),QSerialPort::OneAndHalfStop);
    ui->CB_stopbit->addItem(QString("2"),QSerialPort::TwoStop);
    // flow control 
    ui->CB_flowctrl->addItem("None",QSerialPort::NoFlowControl);// nothing 
    ui->CB_flowctrl->addItem("RTS/CTS",QSerialPort::HardwareControl);// Hardware control 
    ui->CB_flowctrl->addItem("XON/XOFF",QSerialPort::SoftwareControl);// Software control 
}

【5】mainwindow.ui

【6】 Running effect

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