C语言的函数!

内财数模协会 · 发表于 2004-5-9 00:49:34

<

>函数名: inport
功能: 从硬件端口中输入
用法: int inp(int protid);
程序例: <

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

>int main(void)
{
int result;
int port = 0; /* serial port 0 */ result = inport(port);
printf("Word read from port %d = 0x%X\n", port, result);
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:49:51

<

>函数名: insline
功能: 在文本窗口中插入一个空行
用法: void insline(void);
程序例: <

>#include <conio.h> <

>int main(void)
{
clrscr();
cprintf("INSLINE inserts an empty line in the text window\r\n");
cprintf("at the cursor position using the current text\r\n");
cprintf("background color. All lines below the empty one\r\n");
cprintf("move down one line and the bottom line scrolls\r\n");
cprintf("off the bottom of the window.\r\n");
cprintf("\r\nPress any key to continue:");
gotoxy(1, 3);
getch();
insline();
getch();
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:50:08

<

>函数名: installuserdriver
功能: 安装设备驱动程序到BGI设备驱动程序表中
用法: int far installuserdriver(char far *name, int (*detect)(void));
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>/* function prototypes */
int huge detectEGA(void);
void checkerrors(void); int main(void)
{
int gdriver, gmode; /* install a user written device driver */
gdriver = installuserdriver("EGA", detectEGA); /* must force use of detection routine */
gdriver = DETECT; /* check for any installation errors */
checkerrors(); /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); /* check for any initialization errors */
checkerrors(); /* draw a line */
line(0, 0, getmaxx(), getmaxy()); /* clean up */
getch();
closegraph();
return 0;
} /* detects EGA or VGA cards */
int huge detectEGA(void)
{
int driver, mode, sugmode = 0; detectgraph(&driver, &mode);
if ((driver == EGA) || (driver == VGA))
 /* return suggested video mode number */
 return sugmode;
else
 /* return an error code */
 return grError;
} /* check for and report any graphics errors */
void checkerrors(void)
{
int errorcode; /* read result of last graphics operation */
errorcode = graphresult();
if (errorcode != grOk)
{
 printf("Graphics error: %s\n", grapherrormsg(errorcode));
 printf("Press any key to halt:");
 getch();
 exit(1);
}
}

内财数模协会 · 发表于 2004-5-9 00:50:25

<

>函数名: installuserfont
功能: 安装未嵌入BGI系统的字体文件(CHR)
用法: int far installuserfont(char far *name);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h> <

>/* function prototype */
void checkerrors(void); int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode;
int userfont;
int midx, midy; /* initialize graphics and local variables */
initgraph(&gdriver, &gmode, ""); midx = getmaxx() / 2;
midy = getmaxy() / 2; /* check for any initialization errors */
checkerrors(); /* install a user defined font file */
userfont = installuserfont("USER.CHR"); /* check for any installation errors */
checkerrors(); /* select the user font */
settextstyle(userfont, HORIZ_DIR, 4); /* output some text */
outtextxy(midx, midy, "Testing!"); /* clean up */
getch();
closegraph();
return 0;
} /* check for and report any graphics errors */
void checkerrors(void)
{
int errorcode; /* read result of last graphics operation */
errorcode = graphresult();
if (errorcode != grOk)
{
 printf("Graphics error: %s\n", grapherrormsg(errorcode));
 printf("Press any key to halt:");
 getch();
 exit(1);
}
}

内财数模协会 · 发表于 2004-5-9 00:50:40

<

>函数名: int86
功能: 通用8086软中断接口
用法: int int86(int intr_num, union REGS *inregs, union REGS *outregs);
程序例: <

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

>#define VIDEO 0x10 void movetoxy(int x, int y)
{
union REGS regs; regs.h.ah = 2; /* set cursor postion */
regs.h.dh = y;
regs.h.dl = x;
regs.h.bh = 0; /* video page 0 */
int86(VIDEO, &regs, &regs);
} int main(void)
{
clrscr();
movetoxy(35, 10);
printf("Hello\n");
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:51:07

<

>函数名: int86x
功 能: 通用8086软中断接口
用 法: int int86x(int intr_num, union REGS *insegs, union REGS *outregs,
 struct SREGS *segregs);
程序例: <

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

>int main(void)
{
char filename[80];
union REGS inregs, outregs;
struct SREGS segregs; printf("Enter filename: ");
gets(filename);
inregs.h.ah = 0x43;
inregs.h.al = 0x21;
inregs.x.dx = FP_OFF(filename);
segregs.ds = FP_SEG(filename);
int86x(0x21, &inregs, &outregs, &segregs);
printf("File attribute: %X\n", outregs.x.cx);
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:51:27

<

>函数名: intdos
功能: 通用DOS接口
用法: int intdos(union REGS *inregs, union REGS *outregs);
程序例: <

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

>/* deletes file name; returns 0 on success, nonzero on failure */
int delete_file(char near *filename)
{
union REGS regs;
int ret;
regs.h.ah = 0x41; /* delete file */
regs.x.dx = (unsigned) filename;
ret = intdos(&regs, &regs); /* if carry flag is set, there was an error */
return(regs.x.cflag ? ret : 0);
} int main(void)
{
int err;
err = delete_file("NOTEXIST.$$$");
if (!err)
 printf("Able to delete NOTEXIST.$$$\n");
else
 printf("Not Able to delete NOTEXIST.$$$\n");
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:51:47

<

>函数名: intdosx
功 能: 通用DOS中断接口
用 法: int intdosx(union REGS *inregs, union REGS *outregs,
 struct SREGS *segregs);
程序例: <

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

>/* deletes file name; returns 0 on success, nonzero on failure */
int delete_file(char far *filename)
{
union REGS regs; struct SREGS sregs;
int ret;
regs.h.ah = 0x41; /* delete file */
regs.x.dx = FP_OFF(filename);
sregs.ds = FP_SEG(filename);
ret = intdosx(&regs, &regs, &sregs); /* if carry flag is set, there was an error */
return(regs.x.cflag ? ret : 0);
} int main(void)
{
int err;
err = delete_file("NOTEXIST.$$$");
if (!err)
 printf("Able to delete NOTEXIST.$$$\n");
else
 printf("Not Able to delete NOTEXIST.$$$\n");
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:52:03

<

>函数名: intr
功能: 改变软中断接口
用法: void intr(int intr_num, struct REGPACK *preg);
程序例: <

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

>#define CF 1 /* Carry flag */ int main(void)
{
char directory[80];
struct REGPACK reg; printf("Enter directory to change t ");
gets(directory);
reg.r_ax = 0x3B << 8; /* shift 3Bh into AH */
reg.r_dx = FP_OFF(directory);
reg.r_ds = FP_SEG(directory);
intr(0x21, &reg);
if (reg.r_flags & CF)
 printf("Directory change failed\n");
getcwd(directory, 80);
printf("The current directory is: %s\n", directory);
return 0;
}

内财数模协会 · 发表于 2004-5-9 00:52:28

<

>函数名: ioctl
功能: 控制I/O设备
用法: int ioctl(int handle, int cmd[,int *argdx, int argcx]);
程序例: <

>#include <stdio.h>
#include <dir.h>
#include <io.h> <

>int main(void)
{
int stat; /* use func 8 to determine if the default drive is removable */
stat = ioctl(0, 8, 0, 0);
if (!stat)
 printf("Drive %c is removable.\n", getdisk() + 'A');
else
 printf("Drive %c is not removable.\n", getdisk() + 'A');
return 0;
}

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