[Qt-interest] Program crashing when I read quint32 from QDataStream

[Tony Rietwyk]

Hi Nicholas, 

I'm not sure about the specific error message.  Have you read the QDataStream docs?  If the file was not written via QDataStream, then you can only use readRawData on it.  

I don't understand why there isn't a more restricted QBinaryStream that behaves the way you are expecting - it seems to be a common mistake!  

Hope that helps, 

Tony.


> -----Original Message-----
> Sent: Thursday, 10 March 2011 17:28
> 
> Look the code:
> 
>      quint16 compressionCode;
>      quint16 numberOfChannels;
>      quint32 sampleRate;
>      quint32 averageBytesPerSecond;
>      quint16 blockAlign;
>      quint16 significantBitsPerSample;
> 
>      QBuffer buffer(&fileData);
> 
>      buffer.open(QIODevice::ReadOnly);
> 
>      QDataStream stream(&buffer);
>      stream.setByteOrder(QDataStream::LittleEndian);
> 
>      stream >> compressionCode;
>      stream >> numberOfChannels;
>      stream >> sampleRate;
>      stream >> averageBytesPerSecond;
>      stream >> blockAlign;
>      stream >> significantBitsPerSample;
> 
>      buffer.close();
> 
> Programs successfully read all data, but when it try to exit - it's  
> crashing. If I change type of all variables to quint16 - it's 
> works. If I  
> change type of compressionCode to quint32 - it's writing 
> message: "pure  
> virtual method called
> terminate called without an active exception"
> 
> What is wrong?