函数名:?kbhit?

功??能:?检查当前按下的键?

用??法:?int?kbhit(void);?

程序例:?

#include?<conio.h>?
int?main(void)?
{?
???cprintf("Press?any?key?to?continue:");?
???while?(!kbhit())?/*?do?nothing?*/?;?
???cprintf("\r\nA?key?was?pressed...\r\n");?
???return?0;?
}?
??
??
??
函数名:?keep?
功??能:?退出并继续驻留?
用??法:?void?keep(int?status,?int?size);?
程序例:?
This?is?an?interrupt?service?routine.??You?
???can?NOT?compile?this?program?with?Test?
???Stack?Overflow?turned?on?and?get?an?
???executable?file?which?will?operate?
???correctly.??Due?to?the?nature?of?this?
???function?the?formula?used?to?compute?
???the?number?of?paragraphs?may?not?
???necessarily?work?in?all?cases.??Use?with?
???care!??Terminate?Stay?Resident?(TSR)?
???programs?are?complex?and?no?other?support?
???for?them?is?provided.??Refer?to?the?
???MS-DOS?technical?documentation?
???for?more?information.??*/?
???
????
?????
??????
#include?<dos.h>?
/*?The?clock?tick?interrupt?*/?
#define?INTR?0x1C?
/*?Screen?attribute?(blue?on?grey)?*/?
#define?ATTR?0x7900?
/*?reduce?heaplength?and?stacklength?
to?make?a?smaller?program?in?memory?*/?

?
??
???
extern?unsigned?_heaplen?=?1024;?
extern?unsigned?_stklen??=?512;?
void?interrupt?(?*oldhandler)(void);?
void?interrupt?handler(void)?
{?
???unsigned?int?(far?*screen)[80];?
???static?int?count;?
/*?For?a?color?screen?the?video?memory?
???is?at?B800:0000.??For?a?monochrome?
???system?use?B000:000?*/?
???screen?=?MK_FP(0xB800,0);?
/*?increase?the?counter?and?keep?it?
???within?0?to?9?*/?
???count++;?
???count?%=?10;?
/*?put?the?number?on?the?screen?*/?
???screen[0][79]?=?count?+?‘0‘?+?ATTR;?
/*?call?the?old?interrupt?handler?*/?
???oldhandler();?
}?

?
int?main(void)?
{?
/*?get?the?address?of?the?current?clock?
???tick?interrupt?*/?
oldhandler?=?getvect(INTR);?
/*?install?the?new?interrupt?handler?*/?
setvect(INTR,?handler);?
/*?_psp?is?the?starting?address?of?the?
???program?in?memory.??The?top?of?the?stack?
???is?the?end?of?the?program.??Using?_SS?and?
???_SP?together?we?can?get?the?end?of?the?
???stack.??You?may?want?to?allow?a?bit?of?
???saftey?space?to?insure?that?enough?room?
???is?being?allocated?ie:?
???(_SS?+?((_SP?+?safety?space)/16)?-?_psp)?
*/?
keep(0,?(_SS?+?(_SP/16)?-?_psp));?
return?0;?
}?
??
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