[vtkusers] Failed attempt connection between VTK and ZeroMQ

David Cole DLRdave at aol.com
Thu Jul 23 08:59:04 EDT 2015


>From the code you attached:

    vtkRenderWindow *renWin = vtkRenderWindow::New();
    renWin->AddRenderer( ren1 );
    renWin->SetSize( 300, 300 );

    // Send reply back to client
    zmq::message_t reply;
    memcpy((void *)reply.data(), renWin, 99999);

Two questions back to you:

Why do you think a pointer to a vtkRenderWindow in one process may be
sent across a ZMQ socket to another process in this manner?

Why do you think the vtkRenderWindow points to 99999 bytes worth of memory?

I suggest studying up on how to serialize data for sending across a
socket from one process to another before you try to do it with VTK

To start with, search for "serializ" on this web page:
http://zeromq.org/area:faq and just google around for serializing
stuff for zeromq.

Also: http://stackoverflow.com/q/14480161/236192 (and there's a
section on the right with other related stack overflow questions...)

David C.

On Thu, Jul 23, 2015 at 5:24 AM, Paolo Grossi <smoldino at gmail.com> wrote:
> Hi all,
> I'm trying to bind the ZeroMQ properties with the VTK visualisations
> possibility.
> Server/client are written in C++ language.
> The goal of the server is to receive a greet message from the server and to
> respond with the vtkRenderWindow.
> The goal of the client is to send an "Hello" message to the server and to
> receive a vtkRenderWindow in order to reproduce it.
> After the execution I obtain this output with the command "hwclient &
> hwserver":
> [S] Open connection
> [C] Connecting to server…
> [C] Sending Hello
> [S] Received Hello
> terminate called after throwing an instance of 'zmq::error_t'
>   what():  Bad address
> I'm looking forward to hear you.
> Thanks,
> Paolo Grossi.
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