Qt5.8 读写txt文件

关键代码

Widget::Widget(QWidget *parent) :

    QWidget(parent),

    ui(new Ui::Widget)

{

    ui->setupUi(this);

    QObject::connect(ui->writeButton,SIGNAL(clicked(bool)),this,SLOT(writeButtonSlot()));

    QObject::connect(ui->readButton ,SIGNAL(clicked(bool)),this,SLOT( readButtonSlot()));

}

void Widget::readButtonSlot()

{

    QString fileName = QFileDialog::getOpenFileName(

                     this,

                     tr("Open File"),

                     "E:/QtControlFiles/Read",

                     tr("*.txt"));

    QFile file( fileName );

    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))

    {

        qDebug()<<"no read";

        return;

    }

    qDebug()<<"Yes read";

    QTextStream in(&file);

    //QString line = in.readLine();//读取一个回车结束

    QString line = in.readAll();//读取所有

    ui->textEdit->setText(line);

}

void Widget::writeButtonSlot()

{

     QString writeData = ui->textEdit->toPlainText();

     QFile data("E:/QtControlFiles/Write/Txt_Demo.txt");

     if (data.open( QIODevice::Text | QFile::WriteOnly  ))

     {

         qDebug()<<"yes write";

         QTextStream out(&data);

         out << writeData ;

         return;

     }

     qDebug()<<"no write";

}

源程序链接下载：http://download.youkuaiyun.com/detail/m_986883511/9849938