[zeromq-dev] ZMQ appends weird characters to message

[Dávid Kaya]

Well I tried to recreate the problem but it works as intended in my 
short example. I really don't know where could be the problem since I am 
doing it exactly the same way in my example as in my application. Maybe 
the problem is in the std::string, because when I use 
std::string.replace() to replace some characters in the URL then it 
works fine. But when I dont use it and append the URL to "success:" 
message right away, then it does not work. So maybe 
std::string.replace() somehow fixes the string when it rearranges it. 
The first problem with "login" was because I wasn't using size() in 
string constructor.

David

On 15.09.2014 17:56, gonzalo diethelm wrote:
> Please create a short (as short as possible) example that shows this
> symptom, and post it to the list.
>
> --
> 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 12:39 PM
>> To: ZeroMQ development list
>> Subject: Re: [zeromq-dev] ZMQ appends weird characters to message
>>
>> 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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