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程序注释

#include <QCoreApplication>
#include <QtDebug>
#include <QDir>
#include <QString>
#include <QFile>
#include <QTextStream>
#include <QDateTime>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

   // QString mStr = "hello,www.eepw.com.cn";
    QDir Mkpath;
    QString myPath="/home/mjl/QT_exam/lesson2/data";

   if( !Mkpath.exists(myPath))
   {

       Mkpath.mkpath(myPath);

        qDebug() << Mkpath.exists(myPath);
   }

   qDebug()<<"the path is exist!";
    QFile file("/home/mjl/QT_exam/lesson2/data/data.txt");

  if(file.exists())
  {
    qDebug()<<"creat success!";

  }
   file.open(QIODevice::ReadWrite | QIODevice::Text);


   QTextStream out(&file);
   QDateTime time = QDateTime::currentDateTime();//获取当前时间
   myPath = time.toString("a_yyyy-MM-dd_hh-mm-ss");//转换格式
   qDebug()<< myPath;//输出
   out << "hello,eepw";
   out << myPath;
   file.flush();


    file.close();
    return a.exec();
}

运行结果

the path is exist! 
creat success! 
"下午_2016-08-24_04-22-11" 

同时在路径下创建文件

/home/mjl/QT_exam/lesson2/data/data.txt

 data.txt文档内容为

hello,eepw下午_2016-08-24_04-26-04