Backing up a file.

[wysota]

Is this a text file? Because if not, you shouldn't use QTextStream. And even if it is a text file, you shouldn't use QTextStream with the stream operator (you'll lose whitespaces, etc.).

I guess this would be a bit better:

QByteArray data;
while(!sourceFile.atEnd()){
  data = sourceFile.read(64*1024); // read 64kB
  data = qCompress(data);
  destFile.write(data);
}

QByteArray data;
while(!sourceFile.atEnd()){
  data = sourceFile.read(64*1024); // read 64kB
  data = qCompress(data);
  destFile.write(data);
}

To copy to clipboard, switch view to plain text mode