Concatenating two binary files

[marcel]

Don't forget that QFile inherits QIODevice:

QFile prnFile;
//
//...Create the output file, etc
//
 
//first write the ticket
qint64 totalSize = ticket->size();
qint64 chunkSize = 2048; //you can increase it and decrease it as you will
 
char *readBuffer = new char[chunkSize];
while ( totalSize )
{
    if( chunkSize > totalSize )
       chunkSize = totalSize;
    qint64 actuallyRead = ticket->read( readBuffer, chunkSize );
 
    if( actuallyRead > 0 )
         prnFile->write( readBuffer, actuallyRead );
    else
        break;
 
    totalSize -= actuallyRead;
}
// And when you're done:
delete[] readBuffer;
outPrn.flush();

QFile prnFile;
//
//...Create the output file, etc
//

//first write the ticket
qint64 totalSize = ticket->size();
qint64 chunkSize = 2048; //you can increase it and decrease it as you will

char *readBuffer = new char[chunkSize];
while ( totalSize )
{
    if( chunkSize > totalSize )
       chunkSize = totalSize;
    qint64 actuallyRead = ticket->read( readBuffer, chunkSize );

    if( actuallyRead > 0 )
         prnFile->write( readBuffer, actuallyRead );
    else
        break;

    totalSize -= actuallyRead;
}
// And when you're done:
delete[] readBuffer;
outPrn.flush();

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This is only to write the ticket.
After this you can write the same code to write the pdf file( you must use the same output file, and to make sure, position the file pointer at the end of the file ). Or you can make it a function and call it twice.

For more information you can check QIODevice class description.
Feel free to ask if you have any other questions...

Regards