📄 021.htm
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<BR>
<BR>
<BR>
<P>函数名: biosequip
<BR>功 能: 检查设备
<BR>用 法: int biosequip(void);
<BR>程序例:
<BR>
<P>#include <bios.h>
<BR>#include <stdio.h>
<BR>
<P>int main(void)
<BR>{
<BR> int result;
<BR> char buffer[512];
<BR>
<P> printf("Testing to see if drive a: is ready\n");
<BR> result = biosdisk(4,0,0,0,0,1,buffer);
<BR> result &= 0x02;
<BR> (result) ? (printf("Drive A: Ready\n")) :
<BR> (printf("Drive A: Not Ready\n"));
<BR>
<P> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: bioskey
<BR>功 能: 直接使用BIOS服务的键盘接口
<BR>用 法: int bioskey(int cmd);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <bios.h>
<BR>#include <ctype.h>
<BR>
<P>#define RIGHT 0x01
<BR>#define LEFT 0x02
<BR>#define CTRL 0x04
<BR>#define ALT 0x08
<BR>
<P>int main(void)
<BR>{
<BR> int key, modifiers;
<BR>
<P> /* function 1 returns 0 until a key is pressed */
<BR> while (bioskey(1) == 0);
<BR>
<P> /* function 0 returns the key that is waiting */
<BR> key = bioskey(0);
<BR>
<P> /* use function 2 to determine if shift keys were used
*/
<BR> modifiers = bioskey(2);
<BR> if (modifiers)
<BR> {
<BR> printf("[");
<BR> if (modifiers & RIGHT) printf("RIGHT");
<BR> if (modifiers & LEFT) printf("LEFT");
<BR> if (modifiers & CTRL) printf("CTRL");
<BR> if (modifiers & ALT)
printf("ALT");
<BR> printf("]");
<BR> }
<BR> /* print out the character read */
<BR> if (isalnum(key & 0xFF))
<BR> printf("'%c'\n", key);
<BR> else
<BR> printf("%#02x\n", key);
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函数名: biosmemory
<BR>功 能: 返回存储块大小
<BR>用 法:int biosmemory(void);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <bios.h>
<BR>
<P>int main(void)
<BR>{
<BR> int memory_size;
<BR>
<P> memory_size = biosmemory(); /* returns value up to
640K */
<BR> printf("RAM size = %dK\n",memory_size);
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: biosprint
<BR>功 能: 直接使用BIOS服务的打印机I/O
<BR>用 法: int biosprint(int cmd, int byte, int port);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <conio.h>
<BR>#include <bios.h>
<BR>
<P>int main(void)
<BR>{
<BR> #define STATUS 2 /* printer status
command */
<BR> #define PORTNUM 0 /* port number for
LPT1 */
<BR>
<P> int status, abyte=0;
<BR>
<P> printf("Please turn off your printer. Press any key
to continue\n");
<BR> getch();
<BR> status = biosprint(STATUS, abyte, PORTNUM);
<BR> if (status & 0x01)
<BR> printf("Device time out.\n");
<BR> if (status & 0x08)
<BR> printf("I/O error.\n");
<BR>
<P> if (status & 0x10)
<BR> printf("Selected.\n");
<BR> if (status & 0x20)
<BR> printf("Out of paper.\n");
<BR>
<P> if (status & 0x40)
<BR> printf("Acknowledge.\n");
<BR> if (status & 0x80)
<BR> printf("Not busy.\n");
<BR>
<P> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: biostime
<BR>功 能: 读取或设置BIOS时间
<BR>用 法: long biostime(int cmd, long newtime);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <bios.h>
<BR>#include <time.h>
<BR>#include <conio.h>
<BR>
<P>int main(void)
<BR>{
<BR> long bios_time;
<BR>
<P> clrscr();
<BR> cprintf("The number of clock ticks since midnight is:\r\n");
<BR> cprintf("The number of seconds since midnight is:\r\n");
<BR> cprintf("The number of minutes since midnight is:\r\n");
<BR> cprintf("The number of hours since midnight is:\r\n");
<BR> cprintf("\r\nPress any key to quit:");
<BR> while(!kbhit())
<BR> {
<BR> bios_time = biostime(0, 0L);
<BR>
<P> gotoxy(50, 1);
<BR> cprintf("%lu", bios_time);
<BR>
<P> gotoxy(50, 2);
<BR> cprintf("%.4f", bios_time / CLK_TCK);
<BR>
<P> gotoxy(50, 3);
<BR> cprintf("%.4f", bios_time / CLK_TCK
/ 60);
<BR>
<P> gotoxy(50, 4);
<BR> cprintf("%.4f", bios_time / CLK_TCK
/ 3600);
<BR> }
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: brk
<BR>功 能: 改变数据段空间分配
<BR>用 法: int brk(void *endds);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <alloc.h>
<BR>
<P>int main(void)
<BR>{
<BR> char *ptr;
<BR>
<P> printf("Changing allocation with brk()\n");
<BR> ptr = malloc(1);
<BR> printf("Before brk() call: %lu bytes free\n", coreleft());
<BR> brk(ptr+1000);
<BR> printf(" After brk() call: %lu bytes free\n", coreleft());
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: bsearch
<BR>功 能: 二分法搜索
<BR>用 法: void *bsearch(const void *key, const void *base, size_t
*nelem,
<BR> size_t width, int(*fcmp)(const
void *, const *));
<BR>程序例:
<BR>
<P>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>
<P>#define NELEMS(arr) (sizeof(arr) / sizeof(arr[0]))
<BR>
<P>int numarray[] = {123, 145, 512, 627, 800, 933};
<BR>
<P>int numeric (const int *p1, const int *p2)
<BR>{
<BR> return(*p1 - *p2);
<BR>}
<BR>
<P>int lookup(int key)
<BR>{
<BR> int *itemptr;
<BR>
<P> /* The cast of (int(*)(const void *,const void*))
<BR> is needed to avoid a type mismatch error
at
<BR> compile time */
<BR> itemptr = bsearch (&key, numarray, NELEMS(numarray),
<BR> sizeof(int), (int(*)(const void *,const
void *))numeric);
<BR> return (itemptr != NULL);
<BR>}
<BR>
<P>int main(void)
<BR>{
<BR> if (lookup(512))
<BR> printf("512 is in the table.\n");
<BR> else
<BR> printf("512 isn't in the table.\n");
<BR>
<P> return 0;
<BR>}
<BR>
<BR>
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