How to send my own memory buffer via QTcpSocket and QTcpServer?

[wysota]

First of all be aware that if your data structure contains any pointers or non-POD objects (like classes), you will receive garbage on the receiving end.

Now that you have been warned...

The easiest way to do what you want is:

socket->write((const char*)&myOwnBuffer, myOwnBufferSize);

socket->write((const char*)&myOwnBuffer, myOwnBufferSize);

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[fulin]

Thank you, wysota. It works well.

For receiving data, I'm thinking about doing the same way

socket->read(&myReceiveBuffer, myDataMaxSize);

Just do not know how to decide myDataMaxSize. It seems that I must know what is the expected data in advance. For the QByteArray data, the QTcpSocket seems can know the max size.

[wysota]

In general the way you are doing it is a wrong approach. A good approach would be to implement streaming operators to and from QDataStream for your structure and use that instead of sending raw data over network.

[fulin]

Yes, you are right.

But here it is for coping with our legacy native C code.