QT读写文件的问题

Posted 2023-03-17

代码：
voidMainWindow::on_readPushButton_clicked()
QFile filein("C:/Users/Administrator/Desktop/readbefore.txt");
if(!filein.open(QIODevice::ReadOnly|QIODevice::Text))
return;
QTextStream in(&filein);
while(!in.atEnd())
QStringline=in.readLine();
QStringtelnumber="AT+CMGS="+line;
QFile fileout("C:/Users/Administrator/Desktop/readafter.txt");
QTextStream out(&fileout);
out<<telnumber<<<<"\n";

error：line was not declared in this scope
请问应该怎么改

参考技术A QFile in("in.txt");
if(!in.open(QIODevice::ReadOnly | QIODevice::Text))
return ;


QString number;
while(!in.atEnd())
QString line=in.readLine();
number+="AT+COMGS="+line;

QFile out("out.txt");
out.open(QIODevice::WriteOnly | QIODevice::Text);
QTextStream outStream(&out);
outStream<<number;
in.close();
out.close();

稍微修改了一下。注意作用域。本回答被提问者和网友采纳 参考技术B 因为你的字符串没有定义，要不就是在头文件中定义好