Advertisements
RAT_EXIST() Determines if a mouse is available
Returns
<lExists> => mouse is available
Syntax
RAT_EXIST()
Description
This tells if a mouse is present, and mouse driver
software is loaded. The mouse state is not changed.
Examples
if rat_exist()
* do some mouse stuff
else
* don't do some mouse stuff
endif
Notes:
Many mouse libraries use a call to Interrupt 33,
service 0 to determine if a mouse is present. This has the
unpleasant effect of resetting the mouse to its defaults. This blows away
mouse position, cursor and other nifty things that may have been set.
This function uses another means to determine if a
mouse is present, and does not reset the mouse or damage any mouse
settings, thus you can use it with other mouse-oriented libraries
without dire consequences.
Source: S_MOUSE.ASM
Advertisements