Question

I have probably missed something important on QString argument manipulation.

Can’t find the reason why just str2 gives valid result. I’ve found few examples which are written in manner str1 so I guess it should work. Thanks.

QString str1 = QString("%1");
str1.arg("help");
qDebug() << QString("str1 - ") + str1;

QString str2 = QString("%1").arg("help");
qDebug() << QString("str2 - ") + str2;

Results in:

"str1 - %1" 
"str2 - help" 

Answer 1

try to assign the value of arg()

so use the returned value instead

e.g.

QString str1 = QString("%1");
str1 =str1.arg("help");
qDebug() << QString("str1 - ") + str1;