Qt从文件中读取配置

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QString>

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

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

private slots:
    void on_pushButtonBrowseSrc_clicked();

    void on_pushButton_Load_clicked();

    void on_pushButton_BrowseDst_clicked();

    void on_pushButton_Save_clicked();

private:
    Ui::Widget *ui;
    void AnalyzeOneLine(const QByteArray &baLine);
    //分析一行配置文本，设置到对应的控件里
};
#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"
#include <QRegExp>
#include <QRegExpValidator>
#include <QIntValidator>
#include <QFileDialog>
#include <QString>
#include <QFile>
#include <QMessageBox>
Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);
    //定义ipv4正则表达式，
    QRegExp re("^(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}"
                          "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$");
    //新建正则表达式验证器
    QRegExpValidator *revail=new QRegExpValidator(re);
    //设置给lineEditIp
    ui->lineEdit_Ip->setValidator(revail);
    //设置一个整数验证器
    QIntValidator *intVali=new QIntValidator(0,65535);
    //设置给lineEditport
    ui->lineEdit_Port->setValidator(intVali);
}




void Widget::on_pushButtonBrowseSrc_clicked()
{
    QString strSrcName=QFileDialog::getOpenFileName(
                this,
                tr("打开配置文件"),
                tr("."),
                tr("Text files(*.txt);;All files(*)")
                );
    //该函数组关键的就是QFileDialog::getopenFileName()静态函数
    //一般只要设置该静态函数的四个参数
    //第一个参数是父窗口指针，第二个是弹出对话框的标题
    //第三个是弹出对话框默认的开始路径，第四个是文件扩展名过滤字符串
    //多个过滤器用分号隔开，扩展名放在圆括号内
    if(strSrcName.isEmpty())
    {
        return ;
        //空字符串不处理直接返回
    }
    else
    {
        ui->lineEdit_SrcFile->setText(strSrcName);
    }
}


void Widget::on_pushButton_Load_clicked()
{
   //获取源文件名
    QString strSrc=ui->lineEdit_SrcFile->text();
    if(strSrc.isEmpty())
    {
        return;
    }
    QFile fileIn(strSrc);
    if(!fileIn.open(QIODevice::ReadOnly))
    {
        //打开错误
        QMessageBox::warning(this,tr("打开错误"),
                             tr("打开文件错误")+fileIn.errorString());
        return ;

    }
    while(!fileIn.atEnd())
    {
        QByteArray baLine=fileIn.readLine();
        baLine=baLine.trimmed();
        //剔除字符串两端空白
        if(baLine.startsWith('#'))
        {
            continue;//不处理注释行
        }
        AnalyzeOneLine(baLine);
        //正常的设置行，分析这一行的配置项
    }

    QMessageBox::information(this,tr("加载配置"),tr("加载配置完毕！"));

}


void Widget::on_pushButton_BrowseDst_clicked()
{
    QString strDstName=QFileDialog::getSaveFileName(
                this,
                tr("保存配置文件"),
                tr("."),
                tr("TEXT files(*.txt);;ALL files(*)")
                );
    if(strDstName.isEmpty())
        {
            //空字符串不处理
            return;
        }
        else
        {
            //设置要保存的文件名
            ui->lineEdit_DstFile->setText(strDstName);
        }
}

void Widget::AnalyzeOneLine(const QByteArray &baLine)
{
    //按照等号分割
    QList<QByteArray> list =baLine.split('=');
    if(list.count() < 2)
    {
        return ;
        //分隔之后没有配置值，无法设置
    }
    QByteArray optionName=list[0].trimmed().toLower();
    QByteArray optionValue=list[1].trimmed();
    QString strValue = QString::fromLocal8Bit( optionValue );
    if("ip"==optionName)
    {
        ui->lineEdit_Ip->setText(strValue);
        return ;
    }
    if("port"==optionName)
    {
        ui->lineEdit_Port->setText(strValue);
        return ;
    }
    if("hostname"==optionName)
    {
        ui->lineEdit_HostName->setText(strValue);
        return ;
    }
    if("workgroup"==optionName)
    {
        ui->lineEdit_WorkGroup->setText(strValue);
        return ;
    }
}


void Widget::on_pushButton_Save_clicked()
{
    //获取保存文件名
       QString strSaveName = ui->lineEdit_DstFile->text();
       //获取设置值
       QString strIP = ui->lineEdit_Ip->text();
       QString strPort = ui->lineEdit_Port->text();
       QString strHostName = ui->lineEdit_HostName->text();
       QString strWorkGroup = ui->lineEdit_WorkGroup->text();
       //如果字符串有空串就不写入
       if( strSaveName.isEmpty() || strIP.isEmpty() || strPort.isEmpty()
               || strHostName.isEmpty() || strWorkGroup.isEmpty() )
       {
           QMessageBox::warning(this, tr("保存配置"),
                                    tr("需要设置好保存文件名和所有配置项数值。"));
           return;
       }
       //定义文件对象
       QFile fileOut(strSaveName);
       //打开
       if( ! fileOut.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text))
       {
           QMessageBox::warning(this, tr("打开文件"),
                                tr("打开目的文件失败：") + fileOut.errorString() );
           return;
       }
       //构造字节数组写入
       //ip 行
       QByteArray baTemp = "ip = ";
       baTemp += strIP.toLocal8Bit() + "\n";
       fileOut.write( baTemp );
       //port 行
       baTemp = "port = ";
       baTemp += strPort.toLocal8Bit() + "\n";
       fileOut.write( baTemp );
       //hostname 行
       baTemp = "hostname = ";
       baTemp += strHostName.toLocal8Bit() + "\n";
       fileOut.write( baTemp );
       //workgroup 行
       baTemp = "workgroup = ";
       baTemp += strWorkGroup.toLocal8Bit() + "\n";
       fileOut.write( baTemp );
       //提示保存成功
       QMessageBox::information(this, tr("保存配置"), tr("保存配置项成功！"));
   }


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