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Qt-interest Archive, January 2006
Qt4.1.0 QDatastream problem char*

Message 1 in thread

Hi together!
 
I have overload the >> operator in my application, but I have troubles
to read out data in a char pointer.
Folowing theres a code snipe:
 
QDataStream& operator>>(QDataStream& s, SystemGeneral_t& sysGen)
{

char* tmpChar;
s >> tmpChar; 

if(tmpChar)

trcpy(sysGen.projectTitle, tmpChar); /*delete[] tmpChar;*/

s.operator >>(tmpChar); 

if(tmpChar)

strcpy(sysGen.dirName, tmpChar); /*delete[] tmpChar;*/

s >> sysGen.equationOfState >> sysGen.temperatureUnit >>
sysGen.pressureUnit 

>> sysGen.stdTemp >> sysGen.stdPress >> sysGen.newNrOfComponents 

>> sysGen.newComponent >> sysGen.addLibComp;

return s;
Message 2 in thread

Hi together!
 
Sorry I sent the previous email a little bit to fast!
I have overload the >> operator in my application, but I have troubles
to read out data in a char pointer.
Folowing theres a code snipe:
 
QDataStream& operator>>(QDataStream& s, SystemGeneral_t& sysGen)
{

char* tmpChar;
s >> tmpChar; 

if(tmpChar) 
strcpy(sysGen.projectTitle, tmpChar);

return s; 

}

 

Please could anybody help me, I always get a NULL pointer back to
tmpChar!

Thanks!

best regards,
Christian
Message 3 in thread

Hi
 
how did you save your string to the file in the first place?
If you saved a QString you'll have to read a QString etc.
 
Michael Soukup

________________________________

Von: Christian Ranftl []
Gesendet: Do 26.01.2006 14:49
An: 'QT Newsletter'
Betreff: FW: Qt4.1.0 QDatastream problem char*


Hi together!
 
Sorry I sent the previous email a little bit to fast!
I have overload the >> operator in my application, but I have troubles to read out data in a char pointer.
Folowing theres a code snipe:
 
QDataStream& operator>>(QDataStream& s, SystemGeneral_t& sysGen)
{

char* tmpChar;
s >> tmpChar; 

if(tmpChar) 
strcpy(sysGen.projectTitle, tmpChar);

return s; 

}

 

Please could anybody help me, I always get a NULL pointer back to tmpChar!

Thanks!

best regards,
Christian 

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Message 4 in thread

>
> char* tmpChar;
> s >> tmpChar;
>

I don't know if this is related to your specific problem, but with the 
above you're attempting to write to uninitialized memory.  That needs 
fixing in any case.


Julian.

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 [ signature omitted ]
Message 5 in thread

Hi,

> I have overload the >> operator in my application, but I have troubles 
> to read out data in a char pointer.

What sort of trouble? Compile-time or run-time? Any error messages?

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 [ signature omitted ]