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c++qtqmap

QMap::contains() not returning expected value

I have a class that contains a QMap object:

QMap<QString, Connection*> users;

Now, in the following function Foo(), the if clause always returns false but when I iterate through the map, the compared QString, i.e., str1 is present in the keys. 

void Foo(QString& str1, QString& str2)
{    
    if(users.contains(str1))
        users[str1]->doStuff(str2);
    else
    {
        for(QMap<QString, Connection>::iterator iter = users.begin(); 
                           iter!= users.end();iter++)
            qDebug()<<iter.key();
    }
}

Am I doing something wrong? Why doesn't contains() return true ?

Solution

  • With unicode, two strings may be rendered the same but actually be different. Assuming that's the case you'll want to normalize the strings first:

    str = str.normalize(QString::NormalizationForm_D);
if (users.contains(str))
    // do something useful

    Of course, you'll need to normalize the string before you put it in your users map as well.