[solved] Zeromq (delphi bindings) and Lazarus
lazarus / 38-Networking and Web Programming

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cpicanco · 2015-01-13 22:17

Hi,

First, I need to say that I am an enthusiastic programmer (not a
professional one) and I choose to use Lazarus to write programs for my
research. This solution that I am about to point out avoided a re-
write of a program from pascal to python and avoided a re-write of the
delphi zeromq bindings.

I have described this (ugly) solution elsewhere to receive messages
from inside a free pascal program sent by a zeromq publisher protocol,
so please take a look:

http://codereview.stackexchange.com/questions/75653/sync-eye-
movements-with-external-events-python-%C3%98mq-zeromq

Feel free to request any other relevant information.

I have two questions and I would be immensely grateful with any help:

1) have any of you ever tried to use the delphi bindings with Lazarus
and have had success?

2) do you know any better solution to communicate directly with
zeromq?

Best
Rafael

EDIT 1:
the codereview question was updated

working code here
https://github.com/cpicanco/validation_project/blob/master/units/clien
t.pas

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engkin · 2015-01-13 23:34

According to its readme file:
QuoteThis is a binding for ZMQ. Should work with Delphi7+ versions and
with FPC 2.6.0.

Is that the version of FPC you used?

QuoteThe package contains a wrapper (zmq.pas), and a higher level api
(zmqapi.pas).

Which one you used zmq.pas or zmqapi.pas?

QuoteIt should work with ZMQ 2.2.x, and with 3.2.x. For version 2.2.x
undefine zmq3, in zmq.inc.

What version of ZMQ are you trying to use?

Reading quickly through your code linked above, I don't think you are
getting a socket using TZMQSocket. It should be through the context:
Code: [Select]socket := context.Socket( ... );

If RcvTimeout is in milliseconds (I don't know if it is) then 5 is too
small.

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cpicanco · 2015-01-14 01:42

To give you a quick response:
__

Free Pascal
FPC 2.6.2

0mq version
Stable Release 3.2.5

Binding
I am not sure.
__

Let me try again with the FPC 2.6.0
__

For instance, is there a way to use two compilers, choose the compiler
conditionally? I am afraid of downgrade everything and create more
problems. Or should I install a clean version? For example:

http://sourceforge.net/projects/lazarus/files/Lazarus%20Linux%20amd64%
20DEB/Old%20releases/Lazarus%201.0.6/

How may I proceed?

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engkin · 2015-01-14 02:44

No, you don't need to downgrade. I do not see a reason for it.

I do not see "Stable Release 3.2.5" for Windows on the official
distribution link. I do see it mentioned here

What OS are you using?

I suggest that you rewrite this simple python code in pascal and post
your implementation here if it failed to work. I do see clearly that
you commented out some pascal code that does *not* replicate
gettimestamp.py.

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cpicanco · 2015-01-14 04:09

Ubuntu 13.10.

http://zeromq.org/bindings:delphi

Now I can see why so many errors. Hey, do not laugh.

Again, how may I proceed?

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engkin · 2015-01-14 04:17

It might need a few adjustments to work on your OS. Unfortunately I'm
a Windows person. But there are better members here that do work on
Linux.  Wait a few hours and see

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cpicanco · 2015-03-22 03:47

Finally! Just fixed some missing compiler conditionals and it works
just fine! (even with a stand by of some months, it took just 2 days
to make a complete rewrite of the zmq communication system of the
program refered in EDIT1, in the first post)

https://github.com/bvarga/delphizmq