From:	"Nicholas Law" <fake_nic DOT law AT dial DOT pipex DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Mouse driver
Date:	8 Oct 1997 18:29:16 GMT
Organization:	UUNET
Lines:	35
Message-ID:	<01bcd417$eeb1d760$25f582c1@nicland>
NNTP-Posting-Host:	af037.du.pipex.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi all!

I'm writing a program in DJGPP that needs mouse support. However, when I
try to call function 0x00B to get the relative movement of the mouse I get
nonsense numbers. It seems to work when moving to the right or down, but
when moved up or left I get numbers like 3276750 (minimum) in the CX or DX
register. I cannot even see a way of storing such a number in those
registers!

I've attached a bit of code to the bottom of the posting. Am I missing
something obvious?

Thanks in advance,

Nick

-- 
To reply, please remove fake_ from the front of the return address

// Get mouse movement
// r is the dpmi regs structure

int x_mouse_move, y_mouse_move;

   r.x.ax=0x000B;      
   r.x.cx=0;
   r.x.dx=0;
   r.x.bx=0;
   __dpmi_int (0x33, &r);
   
   x_mouse_move = r.x.cx;

   y_mouse_move = r.x.dx;

- Raw text -