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c++qtqstringsegmentfault

Is safe call qWarning("%s", qUtf8Printable(key));

The Qt manu said The char pointer will be invalid after the statement in which qUtf8Printable() is used. This is because the array returned by QString::toUtf8() will fall out of scope.

So does qUtf8Printable(key) will fall out of scope when call qWarning("%s", Utf8Printable(key));?

Solution

  • This is safe. Temporary values used as argument survive until the end of the function call.