mouse handling in c

Mouse handling in C language :

NOTE: As tested On: Turbo C++,Version 3.0 by Borland International,Inc.

Mouse Programming : Introduction :

• Mouse is an input device or pointing device which functions by detecting two-dimensional motion relative to its supporting surface.
• In Graphics User Interface(GUI) system, mouse plays an important role for user interaction. It is very essential key factor in GUI.
• Today, mouse programming is mostly used in games development, animation programming and to build graphical applications like graphs, charts, tables etc.
• In computer system, each device has an unique port which has hexadecimal value.
• It has designed to be machine independent enhancing portability program.
• We can easily access ports in a C program.
• Basically, mouse uses 'interrupts' to access drivers.
• Mouse interrupt is handled using int86 function of dos.h header file.
• Mouse has port 0X33 attached to it and keyboard has attached to port 0X60.
• We can also use address registers.
• These is UNION of type REGS which is defined in "dos.h" header file.
• We can use two registers to communicate to a device driver as one for input and other for output.
• We can send value to device driver through the input register and receive information in it embedded in output register.

AX Register :

• AX=0 --- Returns mouse status
• AX=1 --- Show mouse pointer.
• AX=2 --- Hide mouse pointer.
• AX=3 --- Position of mouse. (X Coordinate:CX, Y Coordinate:DX)
• AX=3 --- Mouse button press

( If BX=0 then no any key is pressed,
If BX=1 then left button is pressed,
If BX=2 then right button is pressed,
If BX=3 then centre button is pressed. )

Programing of mouse handling in c
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