From: deanh AT zip DOT com DOT au (Dean)
Newsgroups: comp.os.msdos.djgpp
Subject: Problems installing mouse handler
Date: Wed, 22 Oct 1997 13:08:38 GMT
Organization: The Zipsters
Lines: 47
Message-ID: <344df950.23766063@news.zip.com.au>
NNTP-Posting-Host: 203.62.148.109
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

I have written a small mouse handler, but have not had a chance to see
if it works yet as the code I use to install it does not seem to do
anything, here's the function:

void mouse_init()
{
  __dpmi_regs regs;

  interrupt = 0x0C;

  mx = midx;
  my = midy;

  //initialise the mouse driver
  regs.x.ax = 0;
  __dpmi_int( 0x33, &regs );

  //lock all data and code
  _go32_dpmi_lock_data( &mx, sizeof(mx) );
    //same thing to rest of variables here
  _go32_dpmi_lock_code( mouse, (unsigned long)((long)__end_mouse - (long)mouse) );

  _go32_dpmi_get_protected_mode_interrupt_vector( interrupt, &old_handler );

  my_handler.pm_offset = (int)mouse;
  my_handler.pm_selector = _go32_my_cs();
  _go32_dpmi_allocate_iret_wrapper( &my_handler )
  _go32_dpmi_set_protected_mode_interrupt_vector( interrupt, &my_handler )
}

All that happens is that the cursor appears in the center of the
screen and does not move.  I put a counter in the actual handler code,
but it just stays a 0, indicating the code is not called.  I'm sure
it's just something simple that I am doing.

BTW I tried removing the line 'my_handler.pm_selector = ...', as I had
seen some example without it, but it did nothing.

Also the program crashes when using cwsdpmi with a SIGSEG.  But I
suspect that is an error in my VESA code...

I would appreciate if you also mailed me the reply, thanks.

Thanks for all your help,

Dean Harding
deanh AT zip DOT com DOT au