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该代码示例展示了如何在Qt环境下创建一个简单的文本编辑器，包含选择字体、设置背景色、打开和另存文件的功能。用户可以使用QFontDialog选择字体，通过QFileDialog打开和保存TXT文件，文件操作涉及QFile的读写操作。

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题目：实现对textedit中的内容进行另存

代码：

text02.cpp

#include "text02.h"
#include "ui_text02.h"
#include <QFontDialog>
#include <QFont>
#include <QMessageBox>
#include <QColorDialog>
#include <QFileDialog>
#include <QFile>
Text02::Text02(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Text02)
{
    ui->setupUi(this);
}

Text02::~Text02()
{
    delete ui;
}


void Text02::on_pushButton_clicked()
{
    bool ok;
    QFont f = QFontDialog::getFont(&ok,QFont("宋体",10),this,"选择字体");
    if(ok)
    {
        ui->textEdit->setCurrentFont(f);
    }
    else
    {
        QMessageBox::information(this,"提示","未选");
    }
}

void Text02::on_pushButton_2_clicked()
{
    QColor c=QColorDialog::getColor();
    ui->textEdit->setTextBackgroundColor(c);
}

void Text02::on_pushButton_3_clicked()
{
    QString fileName=QFileDialog::getOpenFileName(this,"open file","./","Txt(*.txt)");
    QFile file(fileName);
    if(file.open(QFile::ReadWrite))
    {
        QByteArray msg=file.readAll();

        ui->textEdit->setText(QString::fromLocal8Bit(msg));
    }
    else
    {
        QMessageBox::information(this,"","文件打开失败");
    }
}

void Text02::on_pushButton_4_clicked()
{
    QString fileName=QFileDialog::getSaveFileName(this,"save file","./","Txt(*.txt)");
    QFile file(fileName);
    if(file.open(QFile::ReadWrite))
    {
         QByteArray msg = ui->textEdit->toPlainText().toLocal8Bit();
         file.write(msg);
    }
    else
    {
        QMessageBox::information(this,"","文件另存失败");
    }
}

text02.h

#ifndef TEXT02_H
#define TEXT02_H

#include <QWidget>

QT_BEGIN_NAMESPACE
namespace Ui { class Text02; }
QT_END_NAMESPACE

class Text02 : public QWidget
{
    Q_OBJECT

public:
    Text02(QWidget *parent = nullptr);
    ~Text02();

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_pushButton_3_clicked();

    void on_pushButton_4_clicked();

private:
    Ui::Text02 *ui;
};
#endif // TEXT02_H

运行效果：