QString与Unicode的互转

直接贴代码了：

#ifndef TEXTTOUNICODE_H
#define TEXTTOUNICODE_H

#include <QWidget>

namespace Ui
{
    class TextToUnicode;
}

class TextToUnicode : public QWidget
{
    Q_OBJECT

public:
    explicit TextToUnicode(QWidget *parent = nullptr);
    ~TextToUnicode();

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::TextToUnicode *ui;
};

#endif // TEXTTOUNICODE_H

#include "texttounicode.h"
#include "ui_texttounicode.h"
#include <QTextCodec>
#include <QChar>
TextToUnicode::TextToUnicode(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::TextToUnicode)
{
    ui->setupUi(this);
}

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

void TextToUnicode::on_pushButton_clicked()
{
    QString qsText = ui->textEdit->toPlainText();
    QString qsShowText;
    for (int i = 0; i < qsText.length(); i++)
    {
        QChar ch = qsText.at(i);
        ushort num = ch.unicode();
        qsShowText = qsShowText + "u/" + QString::number(num, 16);
    }

    ui->textEdit_2->setText(qsShowText);
}

void TextToUnicode::on_pushButton_2_clicked()
{
    QString qsText = ui->textEdit->toPlainText();
    QString test;

    while (qsText.length() != 0)
    {
        QString qsTemp = qsText.left(6);
        qsTemp = qsTemp.remove(0, 2);
        bool ok  = true;
        ushort num = qsTemp.toUShort(&ok, 16);
        QString qsShowText = QString::fromUtf16(&num, 1);
        test = test + qsShowText;
        qsText.remove(0, 6);
    }
    ui->textEdit_2->setText(test);
}