std::ostringstream problem

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4 total messages Started by Christophe MINETTI Thu, 10 Jan 2008 10:53

#783

Author: Christophe MINETTI
Date: Thu, 10 Jan 2008 10:53

17 lines
1361 bytes

Hi all,

I am using an external frame grabber which uses DLL and internal
structures. To access this DLL, I have to use a strcuture with a member
postr defined as std::ostringstream *postr. Before calling my function I
use this line :

MyStruct.postr = new std::ostringstream;

which returns in a NULL pointer and the functions off the DLL crashes.

Any idea why the constructor std::ostringstream returns me a NULL
pointer ?

Many thanks in advance.

Chritophe

Re: std::ostringstream problem

#784

Author: Asger Joergensen
Date: Thu, 10 Jan 2008 11:24

24 lines
1605 bytes

Hi Christophe
 
 Christophe MINETTI says:
> Hi all,
> 
> I am using an external frame grabber which uses DLL and internal
> structures. To access this DLL, I have to use a strcuture with a member
> postr defined as std::ostringstream *postr. Before calling my function I
> use this line :
> 
> MyStruct.postr = new std::ostringstream;
> 
> which returns in a NULL pointer and the functions off the DLL crashes.
> 
> Any idea why the constructor std::ostringstream returns me a NULL
> pointer ?

You will probably be better of asking this kind of 
questions in the cppbuilder.language.cpp group they know 
a lot more about STL.

Kind regards
Asger

Re: std::ostringstream problem

#785

Author: Christophe MINETTI
Date: Thu, 10 Jan 2008 13:34

30 lines
1789 bytes

Thanks for the suggestion. Sorry if this newsgroup was inappropriate for this
problem.

Christophe

Asger Joergensen wrote:

> Hi Christophe
>
>  Christophe MINETTI says:
> > Hi all,
> >
> > I am using an external frame grabber which uses DLL and internal
> > structures. To access this DLL, I have to use a strcuture with a member
> > postr defined as std::ostringstream *postr. Before calling my function I
> > use this line :
> >
> > MyStruct.postr = new std::ostringstream;
> >
> > which returns in a NULL pointer and the functions off the DLL crashes.
> >
> > Any idea why the constructor std::ostringstream returns me a NULL
> > pointer ?
>
> You will probably be better of asking this kind of
> questions in the cppbuilder.language.cpp group they know
> a lot more about STL.
>
> Kind regards
> Asger

Re: std::ostringstream problem

#788

Author: Jarek Karciarz
Date: Fri, 11 Jan 2008 07:27

31 lines
1716 bytes

have you tried
postr=new std::ostringstream();

Jarek


-- 
Pozdrawiam
Jarek Karciarz
Ositron www.ositron.pl
mail: jka@ositron.pl
Uzytkownik "Christophe MINETTI" <cminetti@ulb.ac.be> napisal w wiadomosci 
news:4785F92D.22DC6601@ulb.ac.be...
> Hi all,
>
> I am using an external frame grabber which uses DLL and internal
> structures. To access this DLL, I have to use a strcuture with a member
> postr defined as std::ostringstream *postr. Before calling my function I
> use this line :
>
> MyStruct.postr = new std::ostringstream;
>
> which returns in a NULL pointer and the functions off the DLL crashes.
>
> Any idea why the constructor std::ostringstream returns me a NULL
> pointer ?
>
> Many thanks in advance.
>
> Chritophe
>

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