[Interest] reading from and writing to a file with QDataStream

[william.crocker at analog.com]

>> Sure, you can look and see that the size() of a QByteArray returns
>> an 'int', but that is only as of today. You should get into the habit
>> of controlling the types written to QDataStreams.
> Actually, for reading and writing binary data files, I think it is wise to get
> into the habbit of using explicitly sized types. That is, write out and read
> back a qint8, a qint32 or a qint64, not an int or a long. int and other integer
> types are not guaranteed to be the same size across platforms, so you may get
> into trouble if you are not explicit about how many bytes you want or expect
> your values to be encoded in.
>

Yes. Even better.

> André
>
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