From:	Fabrice ILPONSE <fabrice AT trash DOT lip6 DOT fr>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: My mouse code returns a wierd button value
Date:	Mon, 12 Jan 1998 11:57:10 +0100
Organization:	Universites Paris VI/Paris VII - France
Lines:	39
Message-ID:	<34B9F706.40F4@trash.lip6.fr>
References:	<6992ta$og4 AT examiner DOT concentric DOT net>
NNTP-Posting-Host:	asim.lip6.fr
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Andy Fung wrote:
> 
> Hi,
> I'm having trouble with a mouse class I wrote for Djgpp v2 C++. When I call
> the interrupt to get the status of the buttons, I get a value of 327680 in
> the button status. This only happens once in a while, but its getting pretty
> frustrating. Please see the codes at the bottom to see if there are any
> errors in it :)
> 
> int mouse::is_right (void) // checks if right button is pressed
> {
> update ();
> if (buttons == 2 || buttons == 3)

	to check buttons use masks:

	eg. if (buttons & 2) is equal to the previous test.
	for the left button: (buttons & 1)
	even if some bits of buttons have no meaning, you're test'll work.

> }
> void mouse::update (void) // updates the status of the mouse
> {
> union REGS regs;
> regs.x.ax = 0x03;
> int86 (0x33, &regs, &regs);
> buttons = regs.x.bx;

	if you define buttons as an int, try to define it as a short.


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	+-+-+	Fabrice ILPONSE
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