Question

QT读写文件的问题

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

Answer 1

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。

Answer 2

因为你的字符串没有定义，要不就是在头文件中定义好