How to read the Binary data from QFile to buffer of type BYTE*???

[squidge]

So what you are trying to do is read the entire contents of the file more than once?

[Gokulnathvc]

Yes.. That is the case

[Lykurg]

Well, then it is nonsense. Simply do something like:

buf += buf;

buf += buf;

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. If you still want to read the file again, use QIODevice::reset().