[Qt-interest] howto convert QString to char*

[Carsten Breuer]

Hi Mathias,

>     char * toChar(const QString str)
>     {
>         QByteArray ba = str.toLatin1();
>         return  ba.data();
>     }

worse! da is destroyed when the function exits.

Are you sure that you doesn't have a constness problem?
What is the exact compiler error?

Try the following:

DllFunctionCall(qstring_inst.toAscii().data());

if the parameter is const.

Else:

QByteArray array = str.toAscii;
DllFunctionCall(array.data());


Regards,



Carsteb


> 
> 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...
> 
> Matthias
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