From: Michael Hale <michael@...>
Date: 2004-08-19T09:58:32+09:00
Subject: calling a swig generated function

I have a library that I wrapped with SWIG.  One of the SWIG generated 
functions looks like this:

static VALUE
_wrap_NSCalculateGap(int argc, VALUE *argv, VALUE self) {
     int arg1 ;
     int arg2 ;
     unsigned long arg3 ;
     double arg4 ;
     unsigned long *arg5 = (unsigned long *) 0 ;
     int arg6 ;
     int arg7 ;
     int arg8 ;
     int result;
     VALUE vresult = Qnil;

     if ((argc < 8) || (argc > 8))
     rb_raise(rb_eArgError, "wrong # of arguments(%d for 8)",argc);
     arg1 = NUM2INT(argv[0]);
     arg2 = NUM2INT(argv[1]);
     arg3 = NUM2ULONG(argv[2]);
     arg4 = (double) NUM2DBL(argv[3]);
     SWIG_ConvertPtr(argv[4], (void **) &arg5, SWIGTYPE_p_unsigned_long, 
1);
     arg6 = NUM2INT(argv[5]);
     arg7 = NUM2INT(argv[6]);
     arg8 = NUM2INT(argv[7]);
     result = 
(int)NSCalculateGap(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8);

     vresult = INT2NUM(result);
     return vresult;
}

How should I call this function from ruby?  I am having problems with 
arg5.  Here is my current attempt:

	pulGap = 0
	Smartlib::NSCalculateGap(iMode, iSpeed, ulPacketLength, dValue, 
pulGap, hub, slot, port)

However this gives me the following error:

	TypeError: wrong argument type Fixnum (expected Data)

Also here is an example from the library documetation:

int iMode = PERCENT_LOAD_TO_GAP_BITS
int iSpeed = SPEED_10GHZ
unsigned long ulPacketLength = 100
double dValue = 95.5
unsigned long ulGap = 0;
NSCalculateGap(iMode,iSpeed,dValue,&ulGap,iHub,iSlot,iPort);

Thanks, Michael

  "OS X: because it was easier to make UNIX user-friendly than to fix 
Windows"