[zeromq-dev] Subscribing in JAVA api

gonzalo diethelm gdiethelm at dcv.cl
Wed May 12 16:10:29 CEST 2010

> Instead of
>  int rc = zmq_setsockopt (s, option, value, strlen (value));
> maybe do
> int rc = zmq_setsockopt (s, option, value, env-> GetStringUTFLength
> (optval));

Robin, I think you are right. How about this: in Java, define two
setsockopt functions:

  public void setsockopt (int option,
                          String optval)
    Setsockopt(option, optval, -1);

  public native void setsockopt (int option,
                                 String optval,
                                 int optvallen);

Then, in native code, do this:

  if (optvallen < 0)
    optvallen = env->GetStringUTFLength (optval);
  int rc = zmq_setsockopt (s, option, value, optvallen);

This way you can force the length of the string to whatever you want,
just like it is done for the C interface. What do you think?

The only doubt I have is this: what is the difference between

  const char *value = env->GetStringUTFChars (optval, NULL);
  optvallen = strlen(value);


  optvallen = env->GetStringUTFLength (optval);

Which one should we actually be using?

Gonzalo Diethelm

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