From: gregarican <greg.kujawa@...>
Date: 2005-10-14T04:36:58+09:00
Subject: Ruby/DL struct! method prototypes

I am trying to use the Ruby/DL library to pass a C event buffer back
and forth. When using the struct! method not all of the method
prototypes are available from all I can tell.

Here's my code:

----------------------
def getEventPoll
        # some stuff here
	@eventBuf=DL.malloc(1024)
	@eventBuf.struct!('LHHLLSI', :hndlPtr, :evtClsPtr, :evtTypPtr, /
            :invIdPtr, :callIdPtr, :devIdPtr, :devIdTypPtr)
	# other stuff here too
end
----------------------

This @eventBuf is an event buffer structure that should be comprised of
the following data types:

hndlPtr = long unsigned
evtClsPtr = short unsigned
evtTypPtr = short unsigned
invIdPtr = long unsigned
callIdPtr = long unsigned
devIdPtr = char[64]
devIdType = int

When I try to access the contents of the structure I get results with
everything but the :devIdPtr item. This comes up blank. I see the data
type should be char and not const char, but I cannot use 's' (lower
case) prototype in the struct! method. I get an error and have to use
the 'S' (upper case) prototype instead.

Any ideas? Any lower case prototypes used in the struct! method cause
the method to fail...