Java: DataOutputStream through socket is wrong on other side (which is Python)

Question

I've got a Socket, s and an long, 1312992.

DataOutputStream out = new DataOutputStream(s.getOutputStream());
out.writeLong(hwnd);
out.flush();

Doing

self.hwnd, = struct.unpack('!Q', self.appletconn.recv(8))
print(self.hwnd)

on the (python) receiving side prints out 51. I presume something's wrong with my sending code.

Thanks.

Yep, then it is probably on the sending end. (Just checking). Do other things get written correctly? — nneonneo, Feb 17 '13 at 04:23
@nneonneo This is the only time I've tried using the `DataOutputStream`, all other times I've used `PrintWriter` and sent text. — Name McChange, Feb 17 '13 at 04:33
Are you mixing `PrintWriter` and `DataOutputStream` on the same socket? — nneonneo, Feb 17 '13 at 04:33
1312992 is 1408E0 in hex, so that is what you should be expecting. If you're not seeing that there is something wrong with the *receiving* code. — user207421, Feb 17 '13 at 09:00

score 0 · Answer 1 · answered Feb 17 '13 at 11:46

0

Use a packet capture tool like tcpdump or wireshark and check what is going on the wire. I am guessing, you might be mixing text and binary on sending and/or receiving side.

answered Feb 17 '13 at 11:46

Bimalesh Jha

1,464
9
17

Java: DataOutputStream through socket is wrong on other side (which is Python)

1 Answers1