From: jsc AT lds DOT co DOT uk
Newsgroups: comp.os.msdos.djgpp
Subject: Aaargh! My mouse function is still not working!!!
Date: Wed, 21 Oct 1998 21:04:01 GMT
Organization: Deja News - The Leader in Internet Discussion
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

I'm sorry to trouble everyone YET again, but I still can't get the dang thing
to work. Here's the code again if you missed - can some kind soul please
comile it and tell me if it works. Note - I am comiling with gcc mouse.c
-omouse.exe is this correct or am I missing something vitally important? Whay
are all the other functions working but this one gives a memory fault upon
pressing of the left mouse button? Note - it only gives the fault if the
Plot_Pixel function tries to access the x and y pointers (from the mouse). If
I let it plot a pixel at, say, 20, 30 with a colour of 3, it works perfectly
when the button is pressed - there must me something wrong with the pointer.
It's really bugging me.  I am having a lot of trouble with Djgpp at the
moment and it's not been very encouraging to me - it's almost driving me away
because I can't get some basic things like a mouse function to work. I'm also
having trouble accessing the SVGA buffer, but more of that later. Please,
please, please help! I am absolutely desperate now. Nothing is working as I
want it really. Thank you very much (and thanks for all your previous
suggestions). Code follows... #include <dos.h> #include <bios.h> #include
<stdio.h> #include <math.h> #include <conio.h>


#define far

#define MOUSE_LB    0x01    /* mouse left button */
#define MOUSE_RB    0x02    /* mouse right button */
#define MOUSE_CB    0x04    /* mouse center button */


void InitGraphics(void)
	{
	union REGS regs;
	regs.x.ax = 0x13;
	int86(0x10, &regs,&regs);
	return;
	}

void ExitGraphics(void)
	{
	union REGS regs;
	regs.x.ax = 0x3;
	int86(0x10, &regs,&regs);
	}

void Plot_Pixel(int x, int y, int colour)
{
_farpokeb(_dos_ds, 0xa0000 + ((y<<8) + (y<<6))+ x, colour);
}

int mouse_detect(void)
{
	union REGS regs;

	regs.x.ax = 0x0;
	int86(0x33, &regs, &regs);

	return regs.x.ax;
}

void mouse_show(void)
{
	union REGS regs;

	regs.x.ax = 0x01;
	int86(0x33, &regs, &regs);
}

void mouse_hide(void)
{
	union REGS regs;

	regs.x.ax = 0x02;
	int86(0x33, &regs, &regs);
}

unsigned char mouse_button(unsigned char button)
{
	union REGS regs;

	regs.x.ax = 0x3;
	int86(0x33, &regs, &regs);

	return (regs.x.bx & button);
}


void mouse_abs_pos(short *x, short *y)
{
	union REGS regs;
	regs.x.ax = 0x03;
	int86(0x33, &regs, &regs);
	*x = regs.x.cx;
	*y = regs.x.dx;

	return;
}




int mouse_rel_pos(short *x, short *y)
{
	union REGS regs;

	regs.x.ax = 0xb;
	int86(0x33, &regs, &regs);
	*x = regs.x.cx;
	*y = regs.x.dx;

	return (*x|*y);
}




int main(void)
{

int buttons,num_buttons;
int colour=1;
short x;
short y;
// put the computer into graphics mode

InitGraphics();

// initialize mouse

mouse_detect();

// show the mouse

mouse_show();

while(!kbhit())
     {



	mouse_abs_pos(&x,&y);

	//mouse_rel_pos(&x,&y);

	if(mouse_button(MOUSE_LB))
	{
	Plot_Pixel((int)&x, (int)&y, colour);
	}

	if(mouse_button(MOUSE_RB))
	{
	if (++colour>15) colour=0;
	}

	}
ExitGraphics();
return(0);
} // end main

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