I'm trying to learn how to use QDataStream for serializing my data and then read it out again later. However, I'm having a trouble with reading out a QString.

The code is just "Hello World" type of app that is just used to see how things work instead of doing anything actually useful.

Qt Code: 
  1. QFile outFile( "output.txt" );
  2.    outFile.open( IO_WriteOnly );
  3.  
  4.    QDataStream outStream( &outFile );
  5.  
  6.    outStream << "The beginning of a series of numbers";
  7.  
  8.    for (int i = 0; i < 50000; i++)
  9.    {
  10.  
  11.       outStream << (Q_INT32) i;
  12.  
  13.    }/* end loop through numbers */
  14.  
  15.    double outFloat = 3.1516342315;
  16.  
  17.    double* addressOfFloat = &outFloat;
  18.  
  19.    outStream << outFloat;
  20.  
  21.    outStream << "The end of the series of numbers.  Have a nice day.";
  22.  
  23.    outFile.close( );
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Opening up the binary file, everything looks to be in there correctly. The strings show up along with the binary for all of the numbers.

Reading out, however, is a different issue.

Qt Code: 
  1. QFile inFile( "output.txt" );
  2.    inFile.open( IO_ReadOnly );
  3.    QDataStream inStream( &inFile );
  4.  
  5.    Q_INT32 data[50000];
  6.  
  7.    QString string;
  8.  
  9.    inStream >> string;
  10.  
  11.    for (int i = 0; i < 50000; i++)
  12.    {
  13.  
  14.       inStream >> data[i];
  15.  
  16.     }
  17.  
  18.    double doubleCheck;
  19.    inStream >> doubleCheck;
  20.  
  21.    inStream >> string;
  22.  
  23.    inFile.close();
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When I take a look at the strings that were read in, it shows up as a string of ??'s instead of the string that I output. This occurs the same whether I'm on Sun or Windows. Am I forgetting some function call?

Thanks in advance for any help.