QTday3

1.文件保存

void Widget::on_savebtn_clicked()
{
    QString fileName = QFileDialog::getOpenFileName(this,"选择文件","./","所有文件(*.*);;头文件(*.h);;图片(*.png *.xpm *.jpg);;文本(*.txt)");
    QFile file(fileName);

    //打开文件
    if(!file.open(QIODevice::ReadWrite|QIODevice::Append))
    {
        QMessageBox::information(this,"提示","文件打开失败");
        return;
    }
    QByteArray msg = (ui->textEdit->toPlainText()).toLocal8Bit();
    file.write(msg);
    file.close();
}

2.登录注册