qt写日志

#include<QFile>

#include<QTextStream>

    QFile file("/Users/name/LogTest.txt");    static int num = 0;    QString str = QString("int  =  %1\r\n").arg(num++);    //第一种//    //if (file.open(QIODevice::WriteOnly|QIODevice::Truncate))//    if (file.open(QIODevice::WriteOnly|QIODevice::Append))//    {//        file.write(str.toLatin1());//    }//    file.close();    //第二种    if (file.open(QIODevice::WriteOnly|QIODevice::Append))    {        QTextStream out(&file);        out << str <<"\r\n";    }    file.close();