[zeromq-dev] ZMQ appends weird characters to message

Dávid Kaya mail at davidkaya.sk
Mon Sep 15 17:21:03 CEST 2014

Well, I've printed out size and it is correct. I've also shortened the 
message by 5 characters and it stopped cutting off the last characters 
(atleast I think it stopped, tried 15 times and it came correct every 
time). So I think the problem was in the length of the message. I don't 
know if it is a bug in ZMQ or system limitation of socket files?


On 15.09.2014 16:47, gonzalo diethelm wrote:
> Good point. Forgot about the specific details for that C++
> constructor. The null byte should not be required.
> As Tom points out, you should print out what you are sending and
> receiving (contents and length) and make sure it makes sense.
> HTH.
> --
> Gonzalo Diethelm
> DCV Chile
>> -----Original Message-----
>> From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-
>> bounces at lists.zeromq.org] On Behalf Of Tom Quarendon
>> Sent: Monday, September 15, 2014 11:42 AM
>> To: ZeroMQ development list
>> Subject: Re: [zeromq-dev] ZMQ appends weird characters to message
>> > You have two choices:
>> > 1. Send the '\0' as part of the message (and set length to one 
>> more byte).
>> > 2. Append a '\0' after receiving the message.
>> Uh, why?
>> string(static_cast<char*>(reply.data()),reply.size());
>> doesn't assume the string is null terminated. It constructs string 
>> from pointer
>> and length. Isn't adding a in a null just going mask the real issue 
>> and make it
>> look like the std::string only contained "login" when really it 
>> still contained
>> the extra stuff as well.
>> David, Do you know what reply.size() actually contains? Have you 
>> tried
>> printing that out and comparing it to what you expect?
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