C语言的函数!

heyi · 发表于 2004-5-10 03:39:44

<

>没有意思，贴的都是大家知道的。把个人心得贴出多好。

内财数模协会 · 发表于 2004-5-10 16:21:38

<

>函数名: open
功能: 打开一个文件用于读或写
用法: int open(char *pathname, int access[, int permiss]);
程序例: <

>#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h> <

>int main(void)
{
int handle;
char msg[] = "Hello world"; if ((handle = open("TEST.$$$", O_CREAT | O_TEXT)) == -1)
{
 perror("Error:");
 return 1;
}
write(handle, msg, strlen(msg));
close(handle);
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:21:49

<

>函数名: outport
功能: 输出整数到硬件端口中
用法: void outport(int port, int value);
程序例: <

>#include <stdio.h>
#include <dos.h> <

>int main(void)
{
int value = 64;
int port = 0; outportb(port, value);
printf("Value %d sent to port number %d\n", value, port);
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:22:00

<

>函数名: outportb
功能: 输出字节到硬件端口中
用法: void outportb(int port, char byte);
程序例: <

>#include <stdio.h>
#include <dos.h> <

>int main(void)
{
int value = 64;
int port = 0; outportb(port, value);
printf("Value %d sent to port number %d\n", value, port);
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:22:11

<

>函数名: outtext
功能: 在视区显示一个字符串
用法: void far outtext(char far *textstring);
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; /* 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("Press any key to halt:");
 getch();
 exit(1); /* terminate with an error code */
} midx = getmaxx() / 2;
midy = getmaxy() / 2; /* move the C.P. to the center of the screen */
moveto(midx, midy); /* output text starting at the C.P. */
outtext("This ");
outtext("is ");
outtext("a ");
outtext("test."); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:22:25

<

>函数名: outtextxy
功能: 在指定位置显示一字符串
用法: void far outtextxy(int x, int y, char *textstring);
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; /* 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("Press any key to halt:");
 getch();
 exit(1); /* terminate with an error code */
} midx = getmaxx() / 2;
midy = getmaxy() / 2; /* output text at the center of the screen*/
/* Note: the C.P. doesn't get changed.*/
outtextxy(midx, midy, "This is a test."); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:23:29

<

>函数名: parsfnm
功能: 分析文件名
用法: char *parsfnm (char *cmdline, struct fcb *fcbptr, int option);
程序例: <

>#include <process.h>
#include <string.h>
#include <stdio.h>
#include <dos.h> <

>int main(void)
{
char line[80];
struct fcb blk; /* get file name */
printf("Enter drive and file name (no path - ie. a:file.dat)\n");
gets(line); /* put file name in fcb */
if (parsfnm(line, &blk, 1) == NULL)
 printf("Error in parsfm call\n");
else
 printf("Drive #%d Name: %11s\n", blk.fcb_drive, blk.fcb_name); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:23:51

<

>函数名: peek
功能: 检查存储单元
用法: int peek(int segment, unsigned offset);
程序例: <

>#include <stdio.h>
#include <conio.h>
#include <dos.h> <

>int main(void)
{
int value = 0; printf("The current status of your keyboard is:\n");
value = peek(0x0040, 0x0017);
if (value & 1)
 printf("Right shift on\n");
else
 printf("Right shift off\n"); if (value & 2)
 printf("Left shift on\n");
else
 printf("Left shift off\n"); if (value & 4)
 printf("Control key on\n");
else
 printf("Control key off\n"); if (value & 8)
 printf("Alt key on\n");
else
 printf("Alt key off\n"); if (value & 16)
 printf("Scroll lock on\n");
else
 printf("Scroll lock off\n"); if (value & 32)
 printf("Num lock on\n");
else
 printf("Num lock off\n"); if (value & 64)
 printf("Caps lock on\n");
else
 printf("Caps lock off\n"); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:24:07

<

>函数名: peekb
功能: 检查存储单元
用法: char peekb (int segment, unsigned offset);
程序例: <

>#include <stdio.h>
#include <conio.h>
#include <dos.h> <

>int main(void)
{
int value = 0; printf("The current status of your keyboard is:\n");
value = peekb(0x0040, 0x0017);
if (value & 1)
 printf("Right shift on\n");
else
 printf("Right shift off\n"); if (value & 2)
 printf("Left shift on\n");
else
 printf("Left shift off\n"); if (value & 4)
 printf("Control key on\n");
else
 printf("Control key off\n"); if (value & 8)
 printf("Alt key on\n");
else
 printf("Alt key off\n"); if (value & 16)
 printf("Scroll lock on\n");
else
 printf("Scroll lock off\n"); if (value & 32)
 printf("Num lock on\n");
else
 printf("Num lock off\n"); if (value & 64)
 printf("Caps lock on\n");
else
 printf("Caps lock off\n"); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:24:20

<

>函数名: perror
功能: 系统错误信息
用法: void perror(char *string);
程序例: <

>#include <stdio.h> <

>int main(void)
{
FILE *fp; fp = fopen("perror.dat", "r");
if (!fp)
 perror("Unable to open file for reading");
return 0;
}

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