bioskey的用法

bioskey

Keyboard interface

int bioskey(int cmd);

Prototype in bios.h
cmd Action
0 ?Return key scancode from buffer and
?delete it from the buffer. Wait for
?the next key if the buffer is empty.
?
1 ?Return key scancode from buffer, but
?do not delete it from the buffer.
?Return 0 if the buffer is empty.
?
2 ?Return the BIOS shift state flags.
?


#include <stdio.h>
#include <bios.h>
#include <ctype.h>

#define RIGHT 0x01
#define LEFT 0x02
#define CTRL 0x04
#define ALT 0x08

int main(void)
{
int key, modifiers;

/* function 1 returns 0 until a key is pressed */
while (bioskey(1) == 0);

/* function 0 returns the key that is waiting */
key = bioskey(0);

/* use function 2 to determine if shift keys were used */
modifiers = bioskey(2);
if (modifiers)
{
printf("[");
if (modifiers & RIGHT) printf("RIGHT");
if (modifiers & LEFT) printf("LEFT");
if (modifiers & CTRL) printf("CTRL");
if (modifiers & ALT) printf("ALT");
printf("]");
}
/* print out the character read */
if (isalnum(key & 0xFF))
printf("'%c'/n", key);
else
printf("%#02x/n", key);
return 0;
}


像这些功能最好自己调试一下,利于记忆啊

我就是这样的,调试出真知啊

:)