[C++知识库]QT问题系列（10） - 仿照QSetting对含有中文的ini进行读写

ini读写会遇到一个很难逃过的一个问题，读写中文，而Qt的ini操作类QSetting对其支持不是很友好，于是就有了自己重写这两个读写接口的想法，实现如下：

解决问题：读写含有group，key，value为中文的ini文件；

解决办法：用QFile读写ini文件，根据[]，和“=”等特殊字符进行判断，做点简单的逻辑处理；

适用于：读写编码为GB2312的ini文件；

读Ini文件：

QVariant ReadIni(QString filePath, QString group, QString key, QString deaultValue)
{
    //1.读文件
    QString szIniPath = filePath;
    bool bExistFile = false;
    szIniPath = szIniPath.replace('\\', '/');
    bExistFile = QFile::exists(szIniPath);
    if (!bExistFile){
        qDebug()<<QString("ReadIni: File[%1] is not exist!").arg(filePath);
        return QVariant(deaultValue);
    }

    QFile file(szIniPath);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug()<<QString("ReadIni: Can't open the file[%1]!").arg(filePath);
        return QVariant(deaultValue);
    }

    bool containGroupFlg=false;
    QString returnStr = "";
    while(!file.atEnd())
    {
        QByteArray baLine = file.readLine();//读取一行的信息
        QString szLine =  QString::fromLocal8Bit(baLine, baLine.length());
        if(szLine.contains(group)){
            containGroupFlg=true;//当前listIndex为group匹配index
            continue;
        }

        if(containGroupFlg){
            if(szLine.contains("[")){
                qDebug() << QString("ReadIni: %1/%2 not find in file[%3]").arg(group).arg(key).arg(filePath);
                return QVariant(deaultValue);
            }else{
                if(szLine.contains("=")){
                    QString groupValue = szLine.section("=",0,0);
                    if(groupValue.contains(key)){
                        returnStr = szLine.section("=",1,1);
                        if(returnStr.endsWith('\n')){
                            returnStr.remove('\n');
                        }
                        file.close();
                        return QVariant(returnStr);
                    }
                }
            }
        }
    }

    file.close();
    return QVariant(deaultValue);
}

写Ini文件：

void WriteIni(QString inifilePath, QString group, QString key, QString strValue)
{
    //QWriteLocker locker(&lock);

    QStringList stOpertorRecordList;
    stOpertorRecordList.clear();

    //1.读文件
     QString szIniPath = inifilePath;
     bool bExistFile = false;
     szIniPath = szIniPath.replace('\\', '/');
     bExistFile = QFile::exists(szIniPath);
     if (!bExistFile){
         qDebug()<<"File is not exist!"<<endl;
         return;
     }

     QFile file(szIniPath);
     if(!file.open(QIODevice::ReadOnly | QIODevice::Text))
     {
         qDebug()<<"Can't open the file!"<<endl;
         return;
     }

     while(!file.atEnd())
     {
         QByteArray baLine = file.readLine();
         QString szLine =  QString::fromLocal8Bit(baLine, baLine.length());
         stOpertorRecordList.append(szLine);
     }

     file.close();

     //2.修改value
     bool containGroupFlg=false;
     for(int listIndex=0; listIndex<stOpertorRecordList.count(); listIndex++)
     {
         QString str = stOpertorRecordList.at(listIndex);
         if(str.contains(group)){
             containGroupFlg=true;//当前listIndex为group匹配index
             continue;
         }

         if(containGroupFlg){
             if(str.contains("[")){
                 qDebug() << "no match group/key.";
                 return;
             }else{
                 if(str.contains(key)){
                     QString finalStr = QString("%1=%2\n").arg(key).arg(strValue);
                     stOpertorRecordList[listIndex] = finalStr;
                     break;
                 }
             }
         }
     }

     //3.写
     if(file.open(QIODevice::ReadWrite | QIODevice::Text))
     {
         file.resize(0); //清空文件
         QTextStream stream(&file);
         stream.setCodec(QTextCodec::codecForName("GB18030"));
         stream.seek(file.size());
         for(int n=0; n<stOpertorRecordList.size(); n++)
         {
             QString szStr = stOpertorRecordList.at(n);
             stream<<szStr;
         }
     }

     file.close();
}

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