On Sunday 11 December 2005 23:47, Victor Lazzarini wrote:

> Thanks a lot. The CsoundArgVList class is new as well isn't
> it? I hadn't seen it before. I presume in Python the idea will
> be more or less the same (deriving a class and overriding
> its methods).

CsoundArgVList and other new "glue" classes are declared in
interfaces/csound.hpp and implemented in interfaces/csound.cpp;
some examples for these would probably be useful.

Also, as an alternative to using the callback wrapper class,
it is possible to collect messages in a buffer that can be
polled after calling API functions that may possibly print
messages. An example:

  Csound cs = new Csound();
  // if the integer argument is non-zero, the messages are
  // also written to stdout/stderr 
  cs.EnableMessageBuffer(0);
  cs.Compile("test.csd");
  int n = cs.GetMessageCnt();  // number of pending messages
  for (int i = 0; i < n; i++) {
    // cs.GetFirstMessage() is the oldest message in the buffer,
    // and cs.GetFirstMessageAttr() is its attributes
    java.lang.System.err.print(cs.GetFirstMessage());
    // remove message from the list, advance to next one
    cs.PopFirstMessage();
  }
  cs.Reset();
  // check for messages again
  // ...
  // free buffer when no longer used before 'cs' is deleted
  // to avoid memory leaks or crashes
  cs.DestroyMessageBuffer();

Of course, this has the disadvantage that you need to explicitly
check for messages after API calls, and if the call takes a long
time (e.g. running an utility) the messages will not be printed
until it returns. Also, the message buffer and the callback wrapper
cannot be used at the same time with the same Csound instance, as
both use the host data pointer.


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