[Qt-interest] howto convert QString to char*

[Gabriel M. Beddingfield]

On Tue, 13 Jul 2010, Matthias Pospiech wrote:

> I am using the following:
>
>    char * toChar(const QString str)
>    {
>        QByteArray ba = str.toLatin1();
>        return  ba.data();
>    }
>
> the bytearray contains usefull data,
> however the value returned by data() is very useless.
> Is this because ba is destroyed at the end of toChar?
> If so, what would you recommend to make such a conversion?
>
> In my code I use this to write
>
> QString sendSignal = "1.23 1" // this is set somewhere else
> char * str = toChar(sendSignal);
> ...
> // dll functions requiring a char* string...

I'm guessing that when you copy to the QByteArray, that's 
where your data is getting copied to a temporary, local 
variable.

What about something like this:

inline char* toChar(const QString str) {
 	return str.toLatin1().data()
}

Or perhaps:

#define toChar(x) ((x).toLatin1().data())

-gabriel