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From: jbs30000 AT aol DOT com (Joel)
Newsgroups: comp.os.msdos.djgpp
Subject: Strange error message
Date: 14 Apr 2004 08:26:29 -0700
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To: djgpp AT delorie DOT com
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I'm trying to test an idea I have about writing an interrupt handler,
but when I compiled the program as I was going along (to catch errors
early) I got a strange error a couple of times.  So I saw a demo
program in one of the help files, so I copied and pasted it, just
making a couple of changes like adding void to the function and
commenting out do_stuff() since it's not a function, and adding
#include <dpmi.h> and #include <go32.h>, tried compiling the test
program, and go the same error.  I wondered if my copy of djgpp was
damaged, so I tried it on another copy I have on another drive, and
still, same error.  So it's my code that's the problem, since the
sample code given gives the same error, and it's not a damaged copy of
djgpp.  So, I'll show the sample code, and the error, and hope that
someone can tell me what's causing it.  Thanks.
#include<go32.h>
#include<dpmi.h>
     _go32_dpmi_registers regs;
     
     void my_handler(_go32_dpmi_registers *r)
     {
       r->d.eax = 4;
     }
     
     void setup()
     {
       _go32_dpmi_seginfo info;
       _go32_dpmi_seginfo old_vector;
       _go32_dpmi_get_real_mode_interrupt_vector(0x84, &old_vector);
       info.pm_offset = my_handler;
       _go32_dpmi_allocate_real_mode_callback_iret(&info, &regs);
       _go32_dpmi_set_real_mode_interrupt_vector(0x84, &info);
       //do_stuff();
       _go32_dpmi_set_real_mode_interrupt_vector(0x84, &old_vector);
       _go32_dpmi_free_real_mode_callback(&info);
     }

The error refersed to the info.pm_offset = my_handler
 Error: error: invalid conversion from `void (*)(__dpmi_regs*)' to
`long
 unsigned int'

Also, in my program (not listed) I get the same error when I try to
_go32_dpmi_lock_code a function of mine.