Qstring Compare

Understanding qstring compare requires examining multiple perspectives and considerations. How to change string into QString? If compiled with STL compatibility, QString has a static method to convert a std::string to a QString: c++ - How to format a QString? From another angle, i'd like to format a string for Qt label, I'm programming in C++ on Qt. In ObjC I would write something like: NSString *format=[NSString stringWithFormat: ... ]; How to do something like that in...

How to convert QString to std::string? QString string; // do things... std::cout << string << std::endl; but the code doesn't compile.

In relation to this, how to output the content of qstring into the console (e.g. for debugging purposes or other reasons)? c++ - What's the purpose of QString?

To stay consistent with this, I've been trying to accept and return QString from most of my function calls, however I find myself converting to and from std::string a lot to use most of the standard library facilities. My question here is, what's the purpose of QString if std::string is part of the standard library? get part of QString - Stack Overflow. From another angle, i want to get QString from another QString, when I know necessary indexes.

It's important to note that, for example: Main string: "This is a string". I want to create new QString from first 5 symbols and get "This ". It's important to note that, whats the best way to send QStrings in a function call?. I would like to know what is the most efficient and practical way of sending a Qstring as a parameter to a function, in QT more specifically. I want to use a reference.

Similarly, the problem is I also want to c++ - Qt String Comparison - Stack Overflow. QString::compare will only return zero if the string passed to it and the string it is called on are equal. Qstring::operator== returns true if the strings are equal otherwise, false.

Building on this, c++ - how to initialize a QString to null? QString phoneNumber; // or if you already have a QString variable and want to 'clear' it: phoneNumber = QString(); Note that QString::number(0) is decidedly not null - it creates a QString with the value "0". You could also initialize the QString with a NULL pointer, but I wouldn't recommend it unless you're passing a pointer regardless of whether it's NULL or not (i.e., it could sometimes ... c++ - QString to char* conversion - Stack Overflow. QString does not use "char" internally so you'd end up with garbage (actually probably the first character on its own, possibly mojibaked as it's UTF-16 according to the docs) In general, reinterpret_cast<> is almost always wrong - it exists because sometimes it's necessary, but in the vast majority of cases, you're doing the wrong thing.