How to deal with “%1” in the argument of QString::arg()?

Question

Everybody loves

QString(\"Put something here %1 and here %2\")
    .arg(replacement1)
    .arg(replacement2);

but things get itchy as soon

Answer 1

See the Qt docs about QString::arg():

QString str;
str = "%1 %2";
str.arg("%1f", "Hello"); // returns "%1f Hello"

Answer 2

Note that the arg() overload for multiple arguments only takes QString. In case not all the arguments are QStrings, you could change the order of the placeholders in the format string:

QString("1%1 2%2 3%3 4%4").arg(int1).arg(string2).arg(string3).arg(int4);

becomes

QString("1%1 2%3 3%4 4%2").arg(int1).arg(int4).arg(string2, string3);

That way, everything that is not a string is replaced first, and then all the strings are replaced at the same time.

Answer 3

You should try using

QString("%1-%2").arg("%2","foo");