From: gregarican <greg.kujawa@...>
Date: 2005-10-09T08:01:51+09:00
Subject: Ruby/DL Question

I am trying to call a method included in a Windows DLL file. Judging by
the C header file that this DLL is created from and judging from the
API documentation I think I have the various parameters needed. But the
return code seems to be different. I have commented my code to include
the C header details as well as a sample C program that accesses this
method. Anyone know what I am missing? I guess I'm confused because the
method is supposed to return an integer result code, but also returns a
pointer called acsHandle. I thought only one thing could be returned
and that's why my Ruby code is just returning the acsHandle pointer...

=begin
acsOpenStream method based on

TSAPI
acsOpenStream (	acsHandle	/* RETURN */
		invokeIDType,	/* INPUT */
		invokeID,	/* INPUT */
		streamType,	/* INPUT */
		serverID,	/* INPUT */
		loginID,	/* INPUT */
		passwd,		/* INPUT */
		applicationName,/* INPUT */
		acsLevelReq,	/* INPUT */
		apiVer,         /* INPUT */
		sendQSize, 	/* INPUT */
		sendExtraBufs,	/* INPUT */
		recvQSize,	/* INPUT */
		recvExtraBufs, 	/* INPUT */
		privateData	/* INPUT */);

here's an example of this in C

rCode=acsOpenStream(acsHandle,invokeIDType,invokeID,streamType,

serverID,loginID,passwd,applicationName,acsLevelReq,

apiVer,sendQSize,sendExtraBufs,recvQSize,recvExtraBufs,

privateData);

if (rCode < 0)<
{

    printf("acsOpenStream failure...");

    return;

}

else

{

    printf("acsOpenStream success\n");

    invokeID=rCode;

}

=end

# here's my Ruby code

require 'dl'
csta=DL.dlopen('csta32.dll')
openStream=csta['acsOpenStream', 'PSISSSSSISIIIIS']
results=openStream.call("LIB_GEN_ID",0,"ST_CSTA","AVAYA#MERLIN#CSTA#MERLIN-CTI\000","username\000","password\000","CTI
Test\000",2,"TS2",0,0,0,0,nil)
p results

# my results show as
# [#<DL::PtrData:0x02ABD620 ptr=0xFFFFFFFE size=0 free=0x00000000>,
["LIB_GEN_ID",0,"ST_CSTA","AVAYA#MERLIN#CSTA#MERLIN-CTI\000","username\000","password\000","CTI
Test\000",2,"TS2",0,0,0,0,nil]]