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C语言库函数(S类字母)

来源:互联网网民  宽屏版  评论
2008-06-01 01:27:24

函数名: sbrk

功 能: 改变数据段空间位置

用 法: char *sbrk(int incr);

程序例:

#include <stdio.h>

#include <alloc.h>

int main(void)

{

printf("Changing allocation with sbrk()\n");

printf("Before sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

sbrk(1000);

printf(" After sbrk() call: %lu bytes free\n",

(unsigned long) coreleft());

return 0;

}

函数名: scanf

功 能: 执行格式化输入

用 法: int scanf(char *format[,argument,...]);

程序例:

#include <stdio.h>

#include <conio.h>

int main(void)

{

char label[20];

char name[20];

int entries = 0;

int loop, age;

double salary;

strUCt Entry_struct

{

char name[20];

int age;

float salary;

} entry[20];

/* Input a label as a string of characters restricting to 20 characters */

printf("\n\nPlease enter a label for the chart: ");

scanf("%20s", label);

fflush(stdin); /* flush the input stream in case of bad input */

/* Input number of entries as an integer */

printf("How many entries will there be? (less than 20) ");

scanf("%d", &entries);

fflush(stdin); /* flush the input stream in case of bad input */

/* input a name restricting input to only letters upper or lower case */

for (loop=0;loop<entries;++loop)

{

printf("Entry %d\n", loop);

printf(" Name : ");

scanf("%[A-Za-z]", entry[loop].name);

fflush(stdin); /* flush the input stream in case of bad input */

/* input an age as an integer */

printf(" Age : ");

scanf("%d", &entry[loop].age);

fflush(stdin); /* flush the input stream in case of bad input */

/* input a salary as a float */

printf(" Salary : ");

scanf("%f", &entry[loop].salary);

fflush(stdin); /* flush the input stream in case of bad input */

}

/* Input a name, age and salary as a string, integer, and double */

printf("\nPlease enter your name, age and salary\n");

scanf("%20s %d %lf", name, &age, &salary);

/* Print out the data that was input */

printf("\n\nTable %s\n",label);

printf("Compiled by %s age %d $%15.2lf\n", name, age, salary);

printf("-----------------------------------------------------\n");

for (loop=0;loop<entries;++loop)

printf("%4d %-20s %5d %15.2lf\n",

loop + 1,

entry[loop].name,

entry[loop].age,

entry[loop].salary);

printf("-----------------------------------------------------\n");

return 0;

}

函数名: searchpath

功 能: 搜索DOS路径

用 法: char *searchpath(char *filename);

程序例:

#include <stdio.h>

#include <dir.h>

int main(void)

{

char *p;

/* Looks for TLINK and returns a pointer

to the path */

p = searchpath("TLINK.EXE");

printf("Search for TLINK.EXE : %s\n", p);

/* Looks for non-existent file */

p = searchpath("NOTEXIST.FIL");

printf("Search for NOTEXIST.FIL : %s\n", p);

return 0;

}

函数名: sector

功 能: 画并填充椭圆扇区

用 法: void far sector(int x, int y, int stangle, int endangle);

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;

int stangle = 45, endangle = 135;

int xrad = 100, yrad = 50;

/* 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;

/* loop through the fill patterns */

for (i=EMPTY_FILL; i<USER_FILL; i++)

{

/* set the fill style */

setfillstyle(i, getmaxcolor());

/* draw the sector slice */

sector(midx, midy, stangle, endangle, xrad, yrad);

getch();

}

/* clean up */

closegraph();

return 0;

}

函数名: segread

功 能: 读段寄存器值

用 法: void segread(struct SREGS *segtbl);

程序例:

#include <stdio.h>

#include <dos.h>

int main(void)

{

struct SREGS segs;

segread(&segs);

printf("Current segment register settings\n\n");

printf("CS: %X DS: %X\n", segs.cs, segs.ds);

printf("ES: %X SS: %X\n", segs.es, segs.ss);

return 0;

}

函数名: setactivepage

功 能: 设置图形输出活动页

用 法: void far setactivepage(int pagenum);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* select a driver and mode that supports */

/* multiple pages. */

int gdriver = EGA, gmode = EGAHI, errorcode;

int x, y, ht;

/* 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 */

}

x = getmaxx() / 2;

y = getmaxy() / 2;

ht = textheight("W");

/* select the off screen page for drawing */

setactivepage(1);

/* draw a line on page #1 */

line(0, 0, getmaxx(), getmaxy());

/* output a message on page #1 */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "This is page #1:");

outtextxy(x, y+ht, "Press any key to halt:");

/* select drawing to page #0 */

setactivepage(0);

/* output a message on page #0 */

outtextxy(x, y, "This is page #0.");

outtextxy(x, y+ht, "Press any key to view page #1:");

getch();

/* select page #1 as the visible page */

setvisualpage(1);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setallpallette

功 能: 按指定方式改变所有的调色板颜色

用 法: void far setallpallette(struct palette, far *pallette);

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;

struct palettetype pal;

int color, maxcolor, ht;

int y = 10;

char msg[80];

/* 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 */

}

maxcolor = getmaxcolor();

ht = 2 * textheight("W");

/* grab a copy of the palette */

getpalette(&pal);

/* display the default palette colors */

for (color=1; color<=maxcolor; color++)

{

setcolor(color);

sprintf(msg, "Color: %d", color);

outtextxy(1, y, msg);

y += ht;

}

/* wait for a key */

getch();

/* black out the colors one by one */

for (color=1; color<=maxcolor; color++)

{

setpalette(color, BLACK);

getch();

}

/* restore the palette colors */

setallpalette(&pal);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setASPectratio

功 能: 设置图形纵横比

用 法: void far setaspectratio(int xasp, int yasp);

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 xasp, yasp, 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;

setcolor(getmaxcolor());

/* get current aspect ratio settings */

getaspectratio(&xasp, &yasp);

/* draw normal circle */

circle(midx, midy, 100);

getch();

/* claer the screen */

cleardevice();

/* adjust the aspect for a wide circle */

setaspectratio(xasp/2, yasp);

circle(midx, midy, 100);

getch();

/* adjust the aspect for a narrow circle */

cleardevice();

setaspectratio(xasp, yasp/2);

circle(midx, midy, 100);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setbkcolor

功 能: 用调色板设置当前背景颜色

用 法: void far setbkcolor(int color);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* select a driver and mode that supports */

/* multiple background colors. */

int gdriver = EGA, gmode = EGAHI, errorcode;

int bkcol, maxcolor, x, y;

char msg[80];

/* 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 */

}

/* maximum color index supported */

maxcolor = getmaxcolor();

/* for centering text messages */

settextjustify(CENTER_TEXT, CENTER_TEXT);

x = getmaxx() / 2;

y = getmaxy() / 2;

/* loop through the available colors */

for (bkcol=0; bkcol<=maxcolor; bkcol++)

{

/* clear the screen */

cleardevice();

/* select a new background color */

setbkcolor(bkcol);

/* output a messsage */

if (bkcol == WHITE)

setcolor(EGA_BLUE);

sprintf(msg, "Background color: %d", bkcol);

outtextxy(x, y, msg);

getch();

}

/* clean up */

closegraph();

return 0;

}

函数名: setblock

功 能: 修改先前已分配的DOS存储段大小

用 法: int setblock(int seg, int newsize);

程序例:

#include <dos.h>

#include <alloc.h>

#include <stdio.h>

#include <stdlib.h>

int main(void)

{

unsigned int size, segp;

int stat;

size = 64; /* (64 x 16) = 1024 bytes */

stat = allocmem(size, &segp);

if (stat == -1)

printf("Allocated memory at segment: %X\n", segp);

else

{

printf("Failed: maximum number of paragraphs available is %d\n",

stat);

exit(1);

}

stat = setblock(segp, size * 2);

if (stat == -1)

printf("EXPanded memory block at segment: %X\n", segp);

else

printf("Failed: maximum number of paragraphs available is %d\n",

stat);

freemem(segp);

return 0;

}

函数名: setbuf

功 能: 把缓冲区与流相联

用 法: void setbuf(FILE *steam, char *buf);

程序例:

#include <stdio.h>

/* BUFSIZ is defined in stdio.h */

char outbuf[BUFSIZ];

int main(void)

{

/* attach a buffer to the standard output stream */

setbuf(stdout, outbuf);

/* put some characters into the buffer */

puts("This is a test of buffered output.\n\n");

puts("This output will go into outbuf\n");

puts("and won't appear until the buffer\n");

puts("fills up or we flush the stream.\n");

/* flush the output buffer */

fflush(stdout);

return 0;

}

函数名: setcbrk

功 能: 设置Control-break

用 法: int setcbrk(int value);

程序例:

#include <dos.h>

#include <conio.h>

#include <stdio.h>

int main(void)

{

int break_flag;

printf("Enter 0 to turn control break off\n");

printf("Enter 1 to turn control break on\n");

break_flag = getch() - 0;

setcbrk(break_flag);

if (getcbrk())

printf("Cntrl-brk flag is on\n");

else

printf("Cntrl-brk flag is off\n");

return 0;

}

函数名: setcolor

功 能: 设置当前画线颜色

用 法: void far setcolor(int color);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* select a driver and mode that supports */

/* multiple drawing colors. */

int gdriver = EGA, gmode = EGAHI, errorcode;

int color, maxcolor, x, y;

char msg[80];

/* 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 */

}

/* maximum color index supported */

maxcolor = getmaxcolor();

/* for centering text messages */

settextjustify(CENTER_TEXT, CENTER_TEXT);

x = getmaxx() / 2;

y = getmaxy() / 2;

/* loop through the available colors */

for (color=1; color<=maxcolor; color++)

{

/* clear the screen */

cleardevice();

/* select a new background color */

setcolor(color);

/* output a messsage */

sprintf(msg, "Color: %d", color);

outtextxy(x, y, msg);

getch();

}

/* clean up */

closegraph();

return 0;

}

函数名: setdate

功 能: 设置DOS日期

用 法: void setdate(struct date *dateblk);

程序例:

#include <stdio.h>

#include <process.h>

#include <dos.h>

int main(void)

{

struct date reset;

struct date save_date;

getdate(&save_date);

printf("Original date:\n");

system("date");

reset.da_year = 2001;

reset.da_day = 1;

reset.da_mon = 1;

setdate(&reset);

printf("Date after setting:\n");

system("date");

setdate(&save_date);

printf("Back to original date:\n");

system("date");

return 0;

}

函数名: setdisk

功 能: 设置当前磁盘驱动器

用 法: int setdisk(int drive);

程序例:

#include <stdio.h>

#include <dir.h>

int main(void)

{

int save, disk, disks;

/* save original drive */

save = getdisk();

/* print number of logic drives */

disks = setdisk(save);

printf("%d logical drives on the system\n\n", disks);

/* print the drive letters available */

printf("Available drives:\n");

for (disk = 0;disk < 26;++disk)

{

setdisk(disk);

if (disk == getdisk())

printf("%c: drive is available\n", disk + 'a');

}

setdisk(save);

return 0;

}

函数名: setdta

功 能: 设置磁盘传输区地址

用 法: void setdta(char far *dta);

程序例:

#include <process.h>

#include <string.h>

#include <stdio.h>

#include <dos.h>

int main(void)

{

char line[80], far *save_dta;

char buffer[256] = "SETDTA test!";

struct fcb blk;

int result;

/* get new file name from user */

printf("Enter a file name to create:");

gets(line);

/* parse the new file name to the dta */

parsfnm(line, &blk, 1);

printf("%d %s\n", blk.fcb_drive, blk.fcb_name);

/* request DOS services to create file */

if (bdosptr(0x16, &blk, 0) == -1)

{

perror("Error creating file");

exit(1);

}

/* save old dta and set new dta */

save_dta = getdta();

setdta(buffer);

/* write new records */

blk.fcb_recsize = 256;

blk.fcb_random = 0L;

result = randbwr(&blk, 1);

printf("result = %d\n", result);

if (!result)

printf("Write OK\n");

else

{

perror("Disk error");

exit(1);

}

/* request DOS services to close the file */

if (bdosptr(0x10, &blk, 0) == -1)

{

perror("Error closing file");

exit(1);

}

/* reset the old dta */

setdta(save_dta);

return 0;

}

函数名: setfillpattern

功 能: 选择用户定义的填充模式

用 法: void far setfillpattern(char far *upattern, int color);

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 maxx, maxy;

/* a user defined fill pattern */

char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00};

/* 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 */

}

maxx = getmaxx();

maxy = getmaxy();

setcolor(getmaxcolor());

/* select a user defined fill pattern */

setfillpattern(pattern, getmaxcolor());

/* fill the screen with the pattern */

bar(0, 0, maxx, maxy);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setfillstyle

功 能: 设置填充模式和颜色

用 法: void far setfillstyle(int pattern, int color);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <conio.h>

/* the names of the fill styles supported */

char *fname[] = { "EMPTY_FILL",

"SOLID_FILL",

"LINE_FILL",

"LTSLASH_FILL",

"SLASH_FILL",

"BKSLASH_FILL",

"LTBKSLASH_FILL",

"HATCH_FILL",

"XHATCH_FILL",

"INTERLEAVE_FILL",

"WIDE_DOT_FILL",

"CLOSE_DOT_FILL",

"USER_FILL"

};

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int style, midx, midy;

char stylestr[40];

/* 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;

for (style = EMPTY_FILL; style < USER_FILL; style++)

{

/* select the fill style */

setfillstyle(style, getmaxcolor());

/* convert style into a string */

strcpy(stylestr, fname[style]);

/* fill a bar */

bar3d(0, 0, midx-10, midy, 0, 0);

/* output a message */

outtextxy(midx, midy, stylestr);

/* wait for a key */

getch();

cleardevice();

}

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setftime

功 能: 设置文件日期和时间

用 法: int setftime(int handle, struct ftime *ftimep);

程序例:

#include <stdio.h>

#include <process.h>

#include <fcntl.h>

#include <io.h>

int main(void)

{

struct ftime filet;

FILE *fp;

if ((fp = fopen("TEST.$$$", "w")) == NULL)

{

perror("Error:");

exit(1);

}

fprintf(fp, "testing...\n");

/* load ftime structure with new time and date */

filet.ft_tsec = 1;

filet.ft_min = 1;

filet.ft_hour = 1;

filet.ft_day = 1;

filet.ft_month = 1;

filet.ft_year = 21;

/* show current Directory for time and date */

system("dir TEST.$$$");

/* change the time and date stamp*/

setftime(fileno(fp), &filet);

/* close and remove the temporary file */

fclose(fp);

system("dir TEST.$$$");

unlink("TEST.$$$");

return 0;

}

函数名: setgraphbufsize

功 能: 改变内部图形缓冲区的大小

用 法: unsigned far setgraphbufsize(unsigned bufsize);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#define BUFSIZE 1000 /* internal graphics buffer size */

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int x, y, oldsize;

char msg[80];

/* set the size of the internal graphics buffer */

/* before making a call to initgraph. */

oldsize = setgraphbufsize(BUFSIZE);

/* 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 */

}

x = getmaxx() / 2;

y = getmaxy() / 2;

/* output some messages */

sprintf(msg, "Graphics buffer size: %d", BUFSIZE);

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, msg);

sprintf(msg, "Old graphics buffer size: %d", oldsize);

outtextxy(x, y+textheight("W"), msg);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: setgraphmode

功 能: 将系统设置成图形模式且清屏

用 法: void far setgraphmode(int mode);

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 x, y;

/* 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 */

}

x = getmaxx() / 2;

y = getmaxy() / 2;

/* output a message */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "Press any key to exit graphics:");

getch();

/* restore system to text mode */

restorecrtmode();

printf("We're now in text mode.\n");

printf("Press any key to return to graphics mode:");

getch();

/* return to graphics mode */

setgraphmode(getgraphmode());

/* output a message */

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, "We're back in graphics mode.");

outtextxy(x, y+textheight("W"), "Press any key to halt:");

/* clean up */

getch();

closegraph();

return 0;

}

 
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函数名: sbrk 功 能: 改变数据段空间位置 用 法: char *sbrk(int incr); 程序例: #include <stdio.h> #include <alloc.h> int main(void) { printf("Changing allocation with sbrk()\n"); printf("Before sbrk() call: %lu bytes free\n", (unsigned long) coreleft()); sbrk(1000); printf(" After sbrk() call: %lu bytes free\n", (unsigned long) coreleft()); return 0; } 函数名: scanf 功 能: 执行格式化输入 用 法: int scanf(char *format[,argument,...]); 程序例: #include <stdio.h> #include <conio.h> int main(void) { char label[20]; char name[20]; int entries = 0; int loop, age; double salary; strUCt Entry_struct { char name[20]; int age; float salary; } entry[20]; /* Input a label as a string of characters restricting to 20 characters */ printf("\n\nPlease enter a label for the chart: "); scanf("%20s", label); fflush(stdin); /* flush the input stream in case of bad input */ /* Input number of entries as an integer */ printf("How many entries will there be? (less than 20) "); scanf("%d", &entries); fflush(stdin); /* flush the input stream in case of bad input */ /* input a name restricting input to only letters upper or lower case */ for (loop=0;loop<entries;++loop) { printf("Entry %d\n", loop); printf(" Name : "); scanf("%[A-Za-z]", entry[loop].name); fflush(stdin); /* flush the input stream in case of bad input */ /* input an age as an integer */ printf(" Age : "); scanf("%d", &entry[loop].age); fflush(stdin); /* flush the input stream in case of bad input */ /* input a salary as a float */ printf(" Salary : "); scanf("%f", &entry[loop].salary); fflush(stdin); /* flush the input stream in case of bad input */ } /* Input a name, age and salary as a string, integer, and double */ printf("\nPlease enter your name, age and salary\n"); scanf("%20s %d %lf", name, &age, &salary); /* Print out the data that was input */ printf("\n\nTable %s\n",label); printf("Compiled by %s age %d $%15.2lf\n", name, age, salary); printf("-----------------------------------------------------\n"); for (loop=0;loop<entries;++loop) printf("%4d %-20s %5d %15.2lf\n", loop + 1, entry[loop].name, entry[loop].age, entry[loop].salary); printf("-----------------------------------------------------\n"); return 0; } 函数名: searchpath 功 能: 搜索DOS路径 用 法: char *searchpath(char *filename); 程序例: #include <stdio.h> #include <dir.h> int main(void) { char *p; /* Looks for TLINK and returns a pointer to the path */ p = searchpath("TLINK.EXE"); printf("Search for TLINK.EXE : %s\n", p); /* Looks for non-existent file */ p = searchpath("NOTEXIST.FIL"); printf("Search for NOTEXIST.FIL : %s\n", p); return 0; } 函数名: sector 功 能: 画并填充椭圆扇区 用 法: void far sector(int x, int y, int stangle, int endangle); 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; int stangle = 45, endangle = 135; int xrad = 100, yrad = 50; /* 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; /* loop through the fill patterns */ for (i=EMPTY_FILL; i<USER_FILL; i++) { /* set the fill style */ setfillstyle(i, getmaxcolor()); /* draw the sector slice */ sector(midx, midy, stangle, endangle, xrad, yrad); getch(); } /* clean up */ closegraph(); return 0; } 函数名: segread 功 能: 读段寄存器值 用 法: void segread(struct SREGS *segtbl); 程序例: #include <stdio.h> #include <dos.h> int main(void) { struct SREGS segs; segread(&segs); printf("Current segment register settings\n\n"); printf("CS: %X DS: %X\n", segs.cs, segs.ds); printf("ES: %X SS: %X\n", segs.es, segs.ss); return 0; } 函数名: setactivepage 功 能: 设置图形输出活动页 用 法: void far setactivepage(int pagenum); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* select a driver and mode that supports */ /* multiple pages. */ int gdriver = EGA, gmode = EGAHI, errorcode; int x, y, ht; /* 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 */ } x = getmaxx() / 2; y = getmaxy() / 2; ht = textheight("W"); /* select the off screen page for drawing */ setactivepage(1); /* draw a line on page #1 */ line(0, 0, getmaxx(), getmaxy()); /* output a message on page #1 */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "This is page #1:"); outtextxy(x, y+ht, "Press any key to halt:"); /* select drawing to page #0 */ setactivepage(0); /* output a message on page #0 */ outtextxy(x, y, "This is page #0."); outtextxy(x, y+ht, "Press any key to view page #1:"); getch(); /* select page #1 as the visible page */ setvisualpage(1); /* clean up */ getch(); closegraph(); return 0; } 函数名: setallpallette 功 能: 按指定方式改变所有的调色板颜色 用 法: void far setallpallette(struct palette, far *pallette); 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; struct palettetype pal; int color, maxcolor, ht; int y = 10; char msg[80]; /* 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 */ } maxcolor = getmaxcolor(); ht = 2 * textheight("W"); /* grab a copy of the palette */ getpalette(&pal); /* display the default palette colors */ for (color=1; color<=maxcolor; color++) { setcolor(color); sprintf(msg, "Color: %d", color); outtextxy(1, y, msg); y += ht; } /* wait for a key */ getch(); /* black out the colors one by one */ for (color=1; color<=maxcolor; color++) { setpalette(color, BLACK); getch(); } /* restore the palette colors */ setallpalette(&pal); /* clean up */ getch(); closegraph(); return 0; } 函数名: setASPectratio 功 能: 设置图形纵横比 用 法: void far setaspectratio(int xasp, int yasp); 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 xasp, yasp, 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; setcolor(getmaxcolor()); /* get current aspect ratio settings */ getaspectratio(&xasp, &yasp); /* draw normal circle */ circle(midx, midy, 100); getch(); /* claer the screen */ cleardevice(); /* adjust the aspect for a wide circle */ setaspectratio(xasp/2, yasp); circle(midx, midy, 100); getch(); /* adjust the aspect for a narrow circle */ cleardevice(); setaspectratio(xasp, yasp/2); circle(midx, midy, 100); /* clean up */ getch(); closegraph(); return 0; } 函数名: setbkcolor 功 能: 用调色板设置当前背景颜色 用 法: void far setbkcolor(int color); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* select a driver and mode that supports */ /* multiple background colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int bkcol, maxcolor, x, y; char msg[80]; /* 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 */ } /* maximum color index supported */ maxcolor = getmaxcolor(); /* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2; /* loop through the available colors */ for (bkcol=0; bkcol<=maxcolor; bkcol++) { /* clear the screen */ cleardevice(); /* select a new background color */ setbkcolor(bkcol); /* output a messsage */ if (bkcol == WHITE) setcolor(EGA_BLUE); sprintf(msg, "Background color: %d", bkcol); outtextxy(x, y, msg); getch(); } /* clean up */ closegraph(); return 0; } 函数名: setblock 功 能: 修改先前已分配的DOS存储段大小 用 法: int setblock(int seg, int newsize); 程序例: #include <dos.h> #include <alloc.h> #include <stdio.h> #include <stdlib.h> int main(void) { unsigned int size, segp; int stat; size = 64; /* (64 x 16) = 1024 bytes */ stat = allocmem(size, &segp); if (stat == -1) printf("Allocated memory at segment: %X\n", segp); else { printf("Failed: maximum number of paragraphs available is %d\n", stat); exit(1); } stat = setblock(segp, size * 2); if (stat == -1) printf("EXPanded memory block at segment: %X\n", segp); else printf("Failed: maximum number of paragraphs available is %d\n", stat); freemem(segp); return 0; } 函数名: setbuf 功 能: 把缓冲区与流相联 用 法: void setbuf(FILE *steam, char *buf); 程序例: #include <stdio.h> /* BUFSIZ is defined in stdio.h */ char outbuf[BUFSIZ]; int main(void) { /* attach a buffer to the standard output stream */ setbuf(stdout, outbuf); /* put some characters into the buffer */ puts("This is a test of buffered output.\n\n"); puts("This output will go into outbuf\n"); puts("and won't appear until the buffer\n"); puts("fills up or we flush the stream.\n"); /* flush the output buffer */ fflush(stdout); return 0; } 函数名: setcbrk 功 能: 设置Control-break 用 法: int setcbrk(int value); 程序例: #include <dos.h> #include <conio.h> #include <stdio.h> int main(void) { int break_flag; printf("Enter 0 to turn control break off\n"); printf("Enter 1 to turn control break on\n"); break_flag = getch() - 0; setcbrk(break_flag); if (getcbrk()) printf("Cntrl-brk flag is on\n"); else printf("Cntrl-brk flag is off\n"); return 0; } 函数名: setcolor 功 能: 设置当前画线颜色 用 法: void far setcolor(int color); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> int main(void) { /* select a driver and mode that supports */ /* multiple drawing colors. */ int gdriver = EGA, gmode = EGAHI, errorcode; int color, maxcolor, x, y; char msg[80]; /* 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 */ } /* maximum color index supported */ maxcolor = getmaxcolor(); /* for centering text messages */ settextjustify(CENTER_TEXT, CENTER_TEXT); x = getmaxx() / 2; y = getmaxy() / 2; /* loop through the available colors */ for (color=1; color<=maxcolor; color++) { /* clear the screen */ cleardevice(); /* select a new background color */ setcolor(color); /* output a messsage */ sprintf(msg, "Color: %d", color); outtextxy(x, y, msg); getch(); } /* clean up */ closegraph(); return 0; } 函数名: setdate 功 能: 设置DOS日期 用 法: void setdate(struct date *dateblk); 程序例: #include <stdio.h> #include <process.h> #include <dos.h> int main(void) { struct date reset; struct date save_date; getdate(&save_date); printf("Original date:\n"); system("date"); reset.da_year = 2001; reset.da_day = 1; reset.da_mon = 1; setdate(&reset); printf("Date after setting:\n"); system("date"); setdate(&save_date); printf("Back to original date:\n"); system("date"); return 0; } 函数名: setdisk 功 能: 设置当前磁盘驱动器 用 法: int setdisk(int drive); 程序例: #include <stdio.h> #include <dir.h> int main(void) { int save, disk, disks; /* save original drive */ save = getdisk(); /* print number of logic drives */ disks = setdisk(save); printf("%d logical drives on the system\n\n", disks); /* print the drive letters available */ printf("Available drives:\n"); for (disk = 0;disk < 26;++disk) { setdisk(disk); if (disk == getdisk()) printf("%c: drive is available\n", disk + 'a'); } setdisk(save); return 0; } 函数名: setdta 功 能: 设置磁盘传输区地址 用 法: void setdta(char far *dta); 程序例: #include <process.h> #include <string.h> #include <stdio.h> #include <dos.h> int main(void) { char line[80], far *save_dta; char buffer[256] = "SETDTA test!"; struct fcb blk; int result; /* get new file name from user */ printf("Enter a file name to create:"); gets(line); /* parse the new file name to the dta */ parsfnm(line, &blk, 1); printf("%d %s\n", blk.fcb_drive, blk.fcb_name); /* request DOS services to create file */ if (bdosptr(0x16, &blk, 0) == -1) { perror("Error creating file"); exit(1); } /* save old dta and set new dta */ save_dta = getdta(); setdta(buffer); /* write new records */ blk.fcb_recsize = 256; blk.fcb_random = 0L; result = randbwr(&blk, 1); printf("result = %d\n", result); if (!result) printf("Write OK\n"); else { perror("Disk error"); exit(1); } /* request DOS services to close the file */ if (bdosptr(0x10, &blk, 0) == -1) { perror("Error closing file"); exit(1); } /* reset the old dta */ setdta(save_dta); return 0; } 函数名: setfillpattern 功 能: 选择用户定义的填充模式 用 法: void far setfillpattern(char far *upattern, int color); 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 maxx, maxy; /* a user defined fill pattern */ char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00}; /* 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 */ } maxx = getmaxx(); maxy = getmaxy(); setcolor(getmaxcolor()); /* select a user defined fill pattern */ setfillpattern(pattern, getmaxcolor()); /* fill the screen with the pattern */ bar(0, 0, maxx, maxy); /* clean up */ getch(); closegraph(); return 0; } 函数名: setfillstyle 功 能: 设置填充模式和颜色 用 法: void far setfillstyle(int pattern, int color); 程序例: #include <graphics.h> #include <stdlib.h> #include <string.h> #include <stdio.h> #include <conio.h> /* the names of the fill styles supported */ char *fname[] = { "EMPTY_FILL", "SOLID_FILL", "LINE_FILL", "LTSLASH_FILL", "SLASH_FILL", "BKSLASH_FILL", "LTBKSLASH_FILL", "HATCH_FILL", "XHATCH_FILL", "INTERLEAVE_FILL", "WIDE_DOT_FILL", "CLOSE_DOT_FILL", "USER_FILL" }; int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int style, midx, midy; char stylestr[40]; /* 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; for (style = EMPTY_FILL; style < USER_FILL; style++) { /* select the fill style */ setfillstyle(style, getmaxcolor()); /* convert style into a string */ strcpy(stylestr, fname[style]); /* fill a bar */ bar3d(0, 0, midx-10, midy, 0, 0); /* output a message */ outtextxy(midx, midy, stylestr); /* wait for a key */ getch(); cleardevice(); } /* clean up */ getch(); closegraph(); return 0; } 函数名: setftime 功 能: 设置文件日期和时间 用 法: int setftime(int handle, struct ftime *ftimep); 程序例: #include <stdio.h> #include <process.h> #include <fcntl.h> #include <io.h> int main(void) { struct ftime filet; FILE *fp; if ((fp = fopen("TEST.$$$", "w")) == NULL) { perror("Error:"); exit(1); } fprintf(fp, "testing...\n"); /* load ftime structure with new time and date */ filet.ft_tsec = 1; filet.ft_min = 1; filet.ft_hour = 1; filet.ft_day = 1; filet.ft_month = 1; filet.ft_year = 21; /* show current Directory for time and date */ system("dir TEST.$$$"); /* change the time and date stamp*/ setftime(fileno(fp), &filet); /* close and remove the temporary file */ fclose(fp); system("dir TEST.$$$"); unlink("TEST.$$$"); return 0; } 函数名: setgraphbufsize 功 能: 改变内部图形缓冲区的大小 用 法: unsigned far setgraphbufsize(unsigned bufsize); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> #define BUFSIZE 1000 /* internal graphics buffer size */ int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y, oldsize; char msg[80]; /* set the size of the internal graphics buffer */ /* before making a call to initgraph. */ oldsize = setgraphbufsize(BUFSIZE); /* 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 */ } x = getmaxx() / 2; y = getmaxy() / 2; /* output some messages */ sprintf(msg, "Graphics buffer size: %d", BUFSIZE); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, msg); sprintf(msg, "Old graphics buffer size: %d", oldsize); outtextxy(x, y+textheight("W"), msg); /* clean up */ getch(); closegraph(); return 0; } 函数名: setgraphmode 功 能: 将系统设置成图形模式且清屏 用 法: void far setgraphmode(int mode); 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 x, y; /* 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 */ } x = getmaxx() / 2; y = getmaxy() / 2; /* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "Press any key to exit graphics:"); getch(); /* restore system to text mode */ restorecrtmode(); printf("We're now in text mode.\n"); printf("Press any key to return to graphics mode:"); getch(); /* return to graphics mode */ setgraphmode(getgraphmode()); /* output a message */ settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, "We're back in graphics mode."); outtextxy(x, y+textheight("W"), "Press any key to halt:"); /* clean up */ getch(); closegraph(); return 0; }
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