Writing one's own class on a socket

[Paul England]

I'm writing a little app, which requires me to send a user-defined class
on a socket.  It looks like QDataStream is what I need, but all the
member functions I have tried won't work.  From what I could see,
writeRawBytes sounds good, but it moans when I try to compile.

My attempt to no avail was:

socket = new QSocket();
user_class my_class;

QDataStream ds(socket);
ds.writeRawBytes(my_class, sizeof(my_class);

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