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1、C语言函数大全C语言函数大全(i开头) 函数名: imagesize 功 能: 返回保存位图像所需的字节数 用 法: unsigned far imagesize(int left, int top, int right, int bottom); 程序例: #include #include #include #include #define ARROW_SIZE 10 void draw_arrow(int x, int y); int main(void) /* request autodetection */ int gdriver = DETECT, gmode, errorcode
2、; void *arrow; int x, y, maxx; unsigned int size; /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ); /* read result of initialization */ errorcode = graphresult; if (errorcode != grOk) /* an error occurred */ printf(Graphics error: %sn, grapherrormsg(errorcode); printf(Pres
3、s any key to halt:); getch; exit(1); /* terminate with an error code */ maxx = getmaxx; x = 0; y = getmaxy / 2; /* draw the image to be grabbed */ draw_arrow(x, y); /* calculate the size of the image */ size = imagesize(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE); /* allocate memory to hold the
4、 image */ arrow = malloc(size); /* grab the image */ getimage(x, y-ARROW_SIZE, x+(4*ARROW_SIZE), y+ARROW_SIZE, arrow); /* repeat until a key is pressed */ while (!kbhit) /* erase old image */ putimage(x, y-ARROW_SIZE, arrow, XOR_PUT); x += ARROW_SIZE; if (x = maxx) x = 0; /* plot new image */ putima
5、ge(x, y-ARROW_SIZE, arrow, XOR_PUT); /* clean up */ free(arrow); closegraph; return 0; void draw_arrow(int x, int y) /* draw an arrow on the screen */ moveto(x, y); linerel(4*ARROW_SIZE, 0); linerel(-2*ARROW_SIZE, -1*ARROW_SIZE); linerel(0, 2*ARROW_SIZE); linerel(2*ARROW_SIZE, -1*ARROW_SIZE); 函数名: i
6、nitgraph 功 能: 初始化图形系统 用 法: void far initgraph(int far *graphdriver, int far *graphmode, char far *pathtodriver); 程序例: #include #include #include #include int main(void) /* request auto detection */ int gdriver = DETECT, gmode, errorcode; /* initialize graphics mode */ initgraph(&gdriver, &gmode, );
7、/* read result of initialization */ errorcode = graphresult; if (errorcode != grOk) /* an error occurred */ printf(Graphics error: %sn, grapherrormsg(errorcode); printf(Press any key to halt:); getch; exit(1); /* return with error code */ /* draw a line */ line(0, 0, getmaxx, getmaxy); /* clean up *
8、/ getch; closegraph; return 0; 函数名: inport 功 能: 从硬件端口中输入 用 法: int inp(int protid); 程序例: #include #include int main(void) int result; int port = 0; /* serial port 0 */ result = inport(port); printf(Word read from port %d = 0x%Xn, port, result); return 0; 函数名: insline 功 能: 在文本窗口中插入一个空行 用 法: void insli
9、ne(void); 程序例: #include int main(void) clrscr; cprintf(INSLINE inserts an empty line in the text windowrn); cprintf(at the cursor position using the current textrn); cprintf(background color. All lines below the empty onern); cprintf(move down one line and the bottom line scrollsrn); cprintf(off the
10、 bottom of the window.rn); cprintf(rnPress any key to continue:); gotoxy(1, 3); getch; insline; getch; return 0; 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 #include #include #include /* function prototypes */ int
11、 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 gra
12、phics 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; detect
13、graph(&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 */ errorco
14、de = graphresult; if (errorcode != grOk) printf(Graphics error: %sn, grapherrormsg(errorcode); printf(Press any key to halt:); getch; exit(1); 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 #include #include #include /* function prototype *
15、/ 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;
16、 /* 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; /* c
17、heck 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: %sn, grapherrormsg(errorcode); printf(Press any key to halt:); getch; exit(1); 函数名: int86 功 能: 通用8086软中
18、断接口 用 法: int int86(int intr_num, union REGS *inregs, union REGS *outregs); 程序例: #include #include #include #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, s, s); int m
19、ain(void) clrscr; movetoxy(35, 10); printf(Hellon); return 0; 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 #include #include int main(void) char filename80; union REGS inregs, outregs; struct SREGS segregs;
20、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: %Xn, outregs.x.cx); return 0; 函数名: intdos 功 能: 通用DOS接口 用 法: int intdos(union REGS *inregs
21、, union REGS *outregs); 程序例: #include #include /* 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(s, s); /* if carry flag is set, there was
22、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.$n); return 0; 函数名: intdosx 功 能: 通用DOS中断接口 用 法: int intdosx(union REGS *inregs, union REGS *outregs, struct SREGS *
23、segregs); 程序例: #include #include /* deletes file name; returns 0 on success, nonzero on failure */ int delete_file(char far *filename) union REGS regs; struct SREGS sregs; int ret; regs.h.ah = 0x41; /* delete file */ regs.x.dx = FP_OFF(filename); sregs.ds = FP_SEG(filename); ret = intdosx(s, s, &sre
24、gs); /* if carry flag is set, there was an error */ return(regs.x.cflag ? ret : 0); int main(void) int err; err = delete_file(NOTEXIST.$); if (!err) printf(Able to delete NOTEXIST.$n); else printf(Not Able to delete NOTEXIST.$n); return 0; 函数名: intr 功 能: 改变软中断接口 用 法: void intr(int intr_num, struct R
25、EGPACK *preg); 程序例: #include #include #include #include #define CF 1 /* Carry flag */ int main(void) char directory80; struct REGPACK reg; printf(Enter directory to change to: ); gets(directory); reg.r_ax = 0x3B 8; /* shift 3Bh into AH */ reg.r_dx = FP_OFF(directory); reg.r_ds = FP_SEG(directory); i
26、ntr(0x21, ); if (reg.r_flags & CF) printf(Directory change failedn); getcwd(directory, 80); printf(The current directory is: %sn, directory); return 0; 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 #include #include int main(void) int stat; /* use f
27、unc 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; 函数名: isatty 功 能: 检查设备类型 用 法: int isatty(int handle); 程序例: #include #include int main(void) int h
28、andle; handle = fileno(stdprn); if (isatty(handle) printf(Handle %d is a device typen, handle); else printf(Handle %d isnt a device typen, handle); return 0; 函数名: itoa 功 能: 把一整数转换为字符串 用 法: char *itoa(int value, char *string, int radix); 程序例: #include #include int main(void) int number = 12345; char string25; itoa(number, string, 10); printf(integer = %d string = %sn, number, string); return 0;
