Need Help in understanding this function

dipen30

dipen30

@dipen30-hGOPpa • Oct 24, 2024
Can Anyone Explain This function ?

int getkey()
{
union REGS i,o;

while(!kbhit())
;
i.h.ah=0;
int86(22,&i,&o);
return(o.h.ah);
}

also what is h & ah in this function ?
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  • illuminatus

    illuminatus

    @illuminatus-XECauN • Aug 6, 2009

    Re: Need Help

    Sm more info abt the prog might help!!!
  • wassup

    wassup

    @wassup-ayhA3F • Aug 6, 2009

    As the name itself suggests it's function to getkey or read a key pressed. The union REGS and int86 are defined in dos.h
    int86 allows you call interrupts. In this program you are calling interrupt number 22. Which is related to keyboard. The union REGS maps x86 registers. So you need one variable for input and one for output.
    The REGS union has two types defined x which is 32 bit and h which 16 bit.
    ax/ah bx/bh are x86 registers.

    REMEMBER this works only in DOS!
  • dipen30

    dipen30

    @dipen30-hGOPpa • Aug 6, 2009

    thanx wassup