[zeromq-dev] ZMQ appends weird characters to message

Dávid Kaya mail at davidkaya.sk
Mon Sep 15 17:39:24 CEST 2014


Yes, I've printed that message. There can't be any NULL byte there. It 
is string "success:" appended with url. It is normal url like 
"http://example.org/path/to/jsp?lang=en_US?session="session id here". 
That session ID contains numbers, characters and dashes.


On 15.09.2014 17:30, gonzalo diethelm wrote:
> No, this is not a (known) limitation. Did you print exactly what you
> are sending and what you are receiving? My guess is you are putting a
> null byte in the middle of what you are sending.
>
> --
> 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 Dávid Kaya
>> Sent: Monday, September 15, 2014 12:21 PM
>> To: zeromq-dev at lists.zeromq.org
>> Subject: Re: [zeromq-dev] ZMQ appends weird characters to message
>>
>> 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?
>>
>> David
>>
>>
>> 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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> -----------------------------------------
> Declaración de confidencialidad: Este Mensaje esta destinado para
> el uso de la o las personas o entidades a quien ha sido dirigido y
> puede contener información reservada y confidencial que no puede
> ser divulgada, difundida, ni aprovechada en forma alguna. El uso no
> autorizado de la información contenida en este correo podrá ser
> sancionado de conformidad con la ley chilena.
> Si usted ha recibido este correo electrónico por error, le pedimos
> eliminarlo junto con los archivos adjuntos y avisar inmediatamente
> al remitente, respondiendo este mensaje.
>
> "Before printing this e-mail think if is really necesary".
> Disclosure: This Message is to be used by the individual,
> individuals or entities that it is addressed to and may include
> private and confidential information that may not be disclosed,
> made public nor used in any way at all. Unauthorized use of the
> information in this electronic mail message may be subject to the
> penalties set forth by Chilean law.
> If you have received this electronic mail message in error, we ask
> you to destroy the message and its attached file(s) and to
> immediately notify the sender by answering this message.
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