QT文件操作

#include <QtCore/QCoreApplication>

#include<QFile>

#include<QString>

#include<QDebug>

#include<QTextStream>

void write(QString& fileName)

{

    QFile mFile(fileName);

    //判断是否成功打开

    if ( ! mFile.open( QFile::WriteOnly | QFile:: Text ))

    {

        qDebug()<<"can't open file";

        return;

    }

    //用输出流关联文件mFile.并输出

    QTextStream outPut(&mFile);

    outPut<<"hello,this is just test file operator";

    //确保缓冲区内容写入磁盘

    mFile.flush();

    mFile.close();

}

void read(QString& fileName)

{

    QFile mFile(fileName);

    if ( ! mFile.open( QFile::ReadOnly | QFile:: Text ))

    {

        qDebug()<<"can't open file";

        return;

    }

    QTextStream inPut(&mFile);

    //一次性读出并写入到temp中，前提是关联文件mFile不能太大。

    QString temp = inPut.readAll();

    qDebug()<<temp;

    mFile.close();

}

int main(int argc, char *argv[])

{

    QCoreApplication a(argc, argv);

    //在磁盘创建一个空文件

    QString fname("E:/test.txt");

    write(fname);

    read(fname);

    return a.exec();

}