QTextStream write to QString ignore endl

[semicloud]

My program is simple

#include <QTextStream>
#include <QDebug>
#include <QString>

int main(int argc, char *argv[])
{
    QString msg;
    QTextStream stream(&msg, QIODevice::Text | QIODevice::WriteOnly);
    stream << "1" << endl;
    stream << "2" << endl;
    stream << "3";
    qDebug() << msg;   // Output "1\n2\n3"
    return 0;
}

What I want is as follows :

1
2
3

But it is seems that QTextStream totally ignore the endl manipulator. The program output is :

1\n2\n3

Besides endl, I have already tried '\n', '\r\n', but not work too.

My platform is Windows 11, the Qt version is 5.12.11(MSVC2017 64bit), and the compiler is MSVC.

Any one can help?

[JKSH]

Hi, and welcome!

@semicloud said in QTextStream write to QString ignore endl:

1\n2\n3

That is correct. \n is the string value of endl. This is the same debug output as qDebug() << QString("1\n2\n3");.

What I want is as follows :

1
2
3

You can do one of the following:

• Write msg to a text file and open it with a text editor.
• Put msg in a QLabel or QTextEdit.
• Convert msg from a QString to a const char*: qDebug() << msg.toUtf8().constData();