reading wrong data from QByteArray

Hi all,

This is short code , which is not giving me what I expect. I dump two integers ( 4 , 8 ) in a QByteArray and when I read them with QDataStream I am getting unexpected values -- 67108864 , 134217728.
What am I doing wrong here?...

Code:

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int numPts = 4;
  int numCells = 8;  
  QByteArray array;
 
  int sizeOfChar = sizeof( char );
  int sizeOfInt = sizeof( int );
 
  array.append( QByteArray::fromRawData ( reinterpret_cast<const char*>( &numPts ), sizeOfInt / sizeOfChar  ) );
  array.append( QByteArray::fromRawData ( reinterpret_cast<const char*>( &numCells ), sizeOfInt / sizeOfChar  )   );
 
  QDataStream streamOut( &array , QIODevice::ReadOnly );
 
  int readNumPts , readNumCells;
 
  streamOut >> readNumPts >> readNumCells;
 
  std::cout<<readNumPts<<" "<<readNumCells<<std::endl;

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Regards
Avanindra Singh

I still don't know the reason for the above code not working , but writing data with QDataStream into QByteArray gave correct results.

Code:

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int numPts = 4;
  int numCells = 8;  
 
  QByteArray array;
 
  int sizeOfChar = sizeof( char );
  int sizeOfInt = sizeof( int );
 
 
  QDataStream streamIn( &array , QIODevice::WriteOnly );
 
  streamIn << numPts << numCells; 
 
  QDataStream streamOut( &array , QIODevice::ReadOnly );
 
  int readNumPts , readNumCells;
 
  streamOut >> readNumPts >> readNumCells;

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QDataStream is not a general purpose binary stream. It is a serialization mechanism.

Two words; byte order.

Quote:

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Originally Posted by ChrisW67

Two words; byte order.

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one word: Endianness :eek: