[C++]Qt文本操作（按行读写）

资料来源：https://blog.csdn.net/flyfish1986/article/details/79487104

 #include <QDebug>
 #include <QFile>

 void ReadLine()
 {

     QFile file("要读的文件路径");
     if (file.open(QIODevice::ReadOnly | QIODevice::Text))
     {
         while (!file.atEnd())
         {
             QByteArray line = file.readLine();
             QString str(line);
             qDebug() << str;
             displayString << str;
         }
         file.close();

     }
 }

 void WriteLine()
 {

     QFile file("要写的文件路径");
     if (file.open(QIODevice::ReadWrite | QIODevice::Text))
     {
         QTextStream stream(&file);
         stream.seek(file.size());
         for (auto& i : displayString)
         {
             QString qs;
             qs.append("Content:");
             qs.append(i);
             qs.remove("\n");
             stream << qs << "\n";
         }
         file.close();
     }
 }