Re: [Gumstix-users] Casting Double

[Kajetan N. <Kaj...@gm...>]

OK. 
But it doesn’t solve the whole Problem. 

In the application we read the bytes from the serial port and store them into a buffer (char array). The data structure doesn’t exist just of double numbers but has also chars float and so on. So the address mod 8 of the double values are not always = 0. 

Has anybody a different solution to this problem? Instead of copy the stream.

Kajetan 



> I expect you have an alignment problem.
> 
> buffer[2] is not properly aligned to a dword boundary, address mod 8 != 0
> 
> RP
> 
> On 7/28/11, "Kajetan Nürnberger" <Kaj...@gm...> wrote:
> > Hello Guys,
> >
> > i have a problem to cast a double number out of a array of chars.
> >
> > Te following code works on an ubuntu Linux system but doesn't work with
> the
> > gumstix system.
> >
> > int main() {
> > 	cout <<"Hallo"<< endl; // prints
> >
> > 	char buffer[500];
> > 	for(int i = 0; i <500; i++)
> > 	{
> > 		buffer[i] = 0x0B;
> > 	}
> >
> > 	double test;
> >
> > 	test = *(double*) &buffer[2];
> >
> > 	cout<<"Test: "<<test<<endl;
> >
> >
> >
> >
> > 	return 0;
> > }
> >
> >
> > To make the code work, I have to copy the 8 bytes of the buffer to an
> extra
> > array with 8 elements before casting it to double.
> >
> > Can somebody tell me why the code shown above doesn't work on gumstix?
> >
> > Thank you very much.
> >
> > --
> > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
> > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
> >
> >
> ------------------------------------------------------------------------------
> > Got Input?   Slashdot Needs You.
> > Take our quick survey online.  Come on, we don't ask for help often.
> > Plus, you'll get a chance to win $100 to spend on ThinkGeek.
> > http://p.sf.net/sfu/slashdot-survey
> > _______________________________________________
> > gumstix-users mailing list
> > gum...@li...
> > https://lists.sourceforge.net/lists/listinfo/gumstix-users
> >
> 
> ------------------------------------------------------------------------------
> Got Input?   Slashdot Needs You.
> Take our quick survey online.  Come on, we don't ask for help often.
> Plus, you'll get a chance to win $100 to spend on ThinkGeek.
> http://p.sf.net/sfu/slashdot-survey
> _______________________________________________
> gumstix-users mailing list
> gum...@li...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users

-- 
NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie!		
Jetzt informieren: http://www.gmx.net/de/go/freephone