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标题: 函数大全(b开头) [打印本页]

作者: 韩冰 时间: 2004-10-4 03:03
标题: 函数大全(b开头)
<

align=center>函数大全(b开头)
<

>函数名: bar 
功能: 画一个二维条形图
用法: void far bar(int left, int top, int right, int bottom);
程序例: 
<

>#include <GRAPHICS.H>
#include <STDLIB.H>
#include <STDIO.H>
#include <CONIO.H>
<

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy, i; 
<

>/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); 
<

>/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("

ress any key to halt:");
getch();
exit(1); /* terminate with an error code */
} 
<

>midx = getmaxx() / 2;
midy = getmaxy() / 2; 
<

>/* loop through the fill patterns */
for (i=SOLID_FILL; i<USER_FILL; {
/* set the fill style */
setfillstyle(i, getmaxcolor()); 
<

>/* draw the bar */
bar(midx-50, midy-50, midx+50,
midy+50); 
<

>getch();
} 
<

>/* clean up */
closegraph();
return 0;
} 


<

>函数名: bar3d 
功能: 画一个三维条形图
用法: void far bar3d(int left, int top, int right, int bottom,
int depth, int topflag);
程序例: 
<

>#include <GRAPHICS.H>
#include <STDLIB.H>
#include <STDIO.H>
#include <CONIO.H>
<

>int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy, i; 
<

>/* initialize graphics, local variables */
initgraph(&gdriver, &gmode, ""); 
<

>/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) /* an error occurred */
{
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("

ress any key to halt:");
getch();
exit(1); /* terminate with error code */
} 
<

>midx = getmaxx() / 2;
midy = getmaxy() / 2; 
<

>/* loop through the fill patterns */
for (i=EMPTY_FILL; i<USER_FILL; {
/* set the fill style */
setfillstyle(i, getmaxcolor()); 
<

>/* draw the 3-d bar */
bar3d(midx-50, midy-50, midx+50, midy+50, 10, 1); 
<

>getch();
} 
<

>/* clean up */
closegraph();
return 0;
}



<

>函数名: bdos 
功能: DOS系统调用
用法: int bdos(int dosfun, unsigned dosdx, unsigned dosal);
程序例: 
<

>#include <STDIO.H>
#include <DOS.H>
<

>/* Get current drive as 'A', 'B', ... */
char current_drive(void)
{
char curdrive; 
<

>/* Get current disk as 0, 1, ... */
curdrive = bdos(0x19, 0, 0);
return('A' + curdrive);
} 
<

>int main(void)
{
printf("The current drive is %c:\n", current_drive());
return 0;
}



<

>函数名: bdosptr 
功能: DOS系统调用
用法: int bdosptr(int dosfun, void *argument, unsigned dosal);
程序例: 
<

>#include <STRING.H>
#include <STDIO.H>
#include <DIR.H>
#include <DOS.H>
#include <ERRNO.H>
#include <STDLIB.H>
#define BUFLEN 80 
int main(void)
{
char buffer[BUFLEN];
int test; 
printf("Enter full pathname of a directory\n");
gets(buffer); 
test = bdosptr(0x3B,buffer,0);
if(test)
{
printf("DOS error message: %d\n", errno);
/* See errno.h for error listings */
exit (1);
} 
getcwd(buffer, BUFLEN);
printf("The current directory is: %s\n", buffer); 
return 0;
}



函数名: bioscom 
功能: 串行I/O通信
用法: int bioscom(int cmd, char abyte, int port);
程序例: 
#include <BIOS.H>
#include <CONIO.H>
#define COM1 0
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0 
#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00) 
int main(void)
{
int in, out, status, DONE = FALSE; 
bioscom(0, SETTINGS, COM1);
cprintf("... BIOSCOM [ESC] to exit ...\n");
while (!DONE)
{
status = bioscom(3, 0, COM1);
if (status & DATA_READY)
if ((out = bioscom(2, 0, COM1) & 0x7F) != 0)
putch(out);
if (kbhit())
{
if ((in = getch()) == '\x1B')
DONE = TRUE;
bioscom(1, in, COM1);
}
}
return 0;
} 


函数名: biosdisk 
功能: 软硬盘I/O
用法: int biosdisk(int cmd, int drive, int head, int track, int sector
int nsects, void *buffer);
程序例: 
#include <BIOS.H>
#include <STDIO.H>
int main(void)
{
int result;
char buffer[512]; 
printf("Testing to see if drive a: is ready\n");
result = biosdisk(4,0,0,0,0,1,buffer);
result &= 0x02;
(result) ? (printf("Drive A: Ready\n")) :
(printf("Drive A: Not Ready\n")); 
return 0;
}



函数名: biosequip 
功能: 检查设备
用法: int biosequip(void);
程序例: 
#include <BIOS.H>
#include <STDIO.H>
int main(void)
{
int result;
char buffer[512]; 
printf("Testing to see if drive a: is ready\n");
result = biosdisk(4,0,0,0,0,1,buffer);
result &= 0x02;
(result) ? (printf("Drive A: Ready\n")) :
(printf("Drive A: Not Ready\n")); 
return 0;
}



函数名: bioskey 
功能: 直接使用BIOS服务的键盘接口
用法: int bioskey(int cmd);
程序例: 
#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;
}


函数名: biosmemory 
功能: 返回存储块大小
用法:int biosmemory(void);
程序例: 
#include <STDIO.H>
#include <BIOS.H>
int main(void)
{
int memory_size; 
memory_size = biosmemory(); /* returns value up to 640K */
printf("RAM size = %dK\n",memory_size);
return 0;
}



函数名: biosprint 
功能: 直接使用BIOS服务的打印机I/O
用法: int biosprint(int cmd, int byte, int port);
程序例: 
#include <STDIO.H>
#include <CONIO.H>
#include <BIOS.H>
int main(void)
{
#define STATUS 2 /* printer status command */
#define PORTNUM 0 /* port number for LPT1 */ 
int status, abyte=0; 
printf("Please turn off your printer. Press any key to continue\n");
getch();
status = biosprint(STATUS, abyte, PORTNUM);
if (status & 0x01)
printf("Device time out.\n");
if (status & 0x08)
printf("I/O error.\n"); 
if (status & 0x10)
printf("Selected.\n");
if (status & 0x20)
printf("Out of paper.\n"); 
if (status & 0x40)
printf("Acknowledge.\n");
if (status & 0x80)
printf("Not busy.\n"); 
return 0;
}



函数名: biostime 
功能: 读取或设置BIOS时间
用法: long biostime(int cmd, long newtime);
程序例: 
#include <STDIO.H>
#include <BIOS.H>
#include <TIME.H>
#include <CONIO.H>
int main(void)
{
long bios_time; 
clrscr();
cprintf("The number of clock ticks since midnight is:\r\n");
cprintf("The number of seconds since midnight is:\r\n");
cprintf("The number of minutes since midnight is:\r\n");
cprintf("The number of hours since midnight is:\r\n");
cprintf("\r\nPress any key to quit:");
while(!kbhit())
{
bios_time = biostime(0, 0L); 
gotoxy(50, 1);
cprintf("%lu", bios_time); 
gotoxy(50, 2);
cprintf("%.4f", bios_time / CLK_TCK); 
gotoxy(50, 3);
cprintf("%.4f", bios_time / CLK_TCK / 60); 
gotoxy(50, 4);
cprintf("%.4f", bios_time / CLK_TCK / 3600);
}
return 0;
}



函数名: brk 
功能: 改变数据段空间分配
用法: int brk(void *endds);
程序例: 
#include <STDIO.H>
#include <ALLOC.H>
int main(void)
{
char *ptr; 
printf("Changing allocation with brk()\n");
ptr = malloc(1);
printf("Before brk() call: %lu bytes free\n", coreleft());
brk(ptr+1000);
printf(" After brk() call: %lu bytes free\n", coreleft());
return 0;
}



函数名: bsearch 
功能: 二分法搜索
用法: void *bsearch(const void *key, const void *base, size_t *nelem,
size_t width, int(*fcmp)(const void *, const *));
程序例: 
#include <STDLIB.H>
#include <STDIO.H>
#define NELEMS(arr) (sizeof(arr) / sizeof(arr[0])) 
int numarray[] = {123, 145, 512, 627, 800, 933}; 
int numeric (const int *p1, const int *p2)
{
return(*p1 - *p2);
} 
int lookup(int key)
{
int *itemptr; 
/* The cast of (int(*)(const void *,const void*))
is needed to avoid a type mismatch error at
compile time */
itemptr = bsearch (&key, numarray, NELEMS(numarray),
sizeof(int), (int(*)(const void *,const void *))numeric);
return (itemptr != NULL);
} 
int main(void)
{
if (lookup(512))
printf("512 is in the table.\n");
else
printf("512 isn't in the table.\n"); 
return 0;
}

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