Hi all, I am trying to pass in a scalar to the DoAttach C function, which is then modified by the C function and returned to the perl program. It is getting modified okay, but not as I want/expect!! Here's the perl code:- 
$hObject = 0;
$result = &testmain::DoAttach( 123, 0x1234, $hObject);

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This is the code in the XS file:- 
long
dsmFSAttach(PID,service,hFS)
    unsigned short     PID
    unsigned short     service
    unsigned long   *   hFS

    OUTPUT:
    hFS
    RETVAL

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And here is the C code that tries to modify the var:- 
long DoAttach(unsigned short PID, 
             unsigned short service, 
             unsigned long *hFS)
{
    *hFS = ReturnFromSomeFunc(...)
    return foo;
}

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When this is run the hFS variable in the C function is set to 48 (The ASCII value for 0), and after it is altered by the function it is filled with F's, i.e Print it as an 8bit value and it will print 255... I have tried several combinations in the typemap file - unsigned long * T_PV unsigned long * T_IV unsigned long * T_RV None seem to work! Any help would be excellent, Thanks in advance Paul
PS If you read this and can answer tonight (Thursday 31st May) could you plz email me at paul.hunt@blueyonder.co.uk, if not p_hunt@bitwise.co.uk Thanks again

In reply to PerlXS type problem by PH

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