QT打开txt文件，读取修改，解析数据。

#include "modify.h"

modify::modify()

{

    readFile=new QFile("E:/xwj/project/moidfy_GPgga/modifyGGA/RxRec20110607_070017.txt");

    writeFile=new QFile("E:/xwj/project/moidfy_GPgga/modifyGGA/RxRec20110607_070017.txt");

    readTxt();

}

void modify::readTxt()

{

    if(!readFile->open(QIODevice::ReadOnly|QIODevice::Text)) {

        qDebug()<<"Can't open the file!"< 
  
    }
 
  
    else
 
  
    {
 
  
        QTextStream stream(readFile);
 
  
        strAll=stream.readAll();
 
  
    }
 
  
    readFile->close();
 
  
    if(!writeFile->open(QIODevice::WriteOnly|QIODevice::Text))
 
  
    {
 
  
        qDebug()<<"Can't write the file!"< 
  
    }
 
  
    else
 
  
    {
 
  
        QTextStream stream(writeFile);
 
  
        strList=strAll.split("\n");
 
  
        for(int i=0;i<strList.count();i++)
 
  
        {
 
  
            if(i==strList.count()-1)
 
  
                         {
 
  
                             //最后一行不需要换行
 
  
                             stream<<strList.at(i);
 
  
                         }
 
  
            else if(strList.at(i).contains("$PCSI")){
 
  
                QString s;
 
  
                strListforPCSI=strList.at(i).split(",");
 
  
                    int p=strListforPCSI.at(9).toInt();
 
  
                    int len=strListforPCSI.at(9).length();
 
  
                    if(p<=13&&p>=10)
 
  
                        p+=3+qrand()%(5-3);
 
  
                    else if(p<=9&&p>=6)
 
  
                        p+=6+qrand()%(8-6);
 
  
                    else if(p<=5&&p>=2)
 
  
                        p+=10+qrand()%(13-10);
 
  
                    else if(p<=2)
 
  
                        p+=13+qrand()%(15-13);
 
  
                    s=QString::number(p);
 
  
                QString tempStr=strList.at(i);
 
  
                tempStr.replace(45,len,s);
 
  
                qDebug()<<"int p:="< 
  
                qDebug()< 
  
                qDebug()<<"int s="< 
  
                stream<'\n';
 
  
            }
 
  
            else
 
  
            {
 
  
                 stream<<strList.at(i)<<'\n';
 
  
            }
 
  
        }
 
  
    }
 
  
    readFile->close();
 
  
    qDebug()<<"OK!";
 
  
}