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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 ;
#include ;
#include ;
#include ;
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 ;
#include ;
#include ;
#include ;
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 ;
/* 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 ;
#include ;
#include ;
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 ;
#include ;
#include ;
#include ;
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函数名: setdate
功 能: 设置DOS日期
用 法: void setdate(struct date *dateblk);
程序例:
#include ;
#include ;
#include ;
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 ;
#include ;
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 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 ;
#include ;
#include ;
#include ;
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 ;
#include ;
#include ;
#include ;
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 ;
#include ;
#include ;
#include ;
#include ;
/* 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 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 ;
#include ;
#include ;
#include ;
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 ;
#include ;
#include ;
#include ;
#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 ;
#include ;
#include ;
#include ;
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;
}
当前位置: 首页 > LAMP交流 > linux之家 > 文章正文 C语言库函数---unix常用系统调用---使用说明（下）时间:2010-2-28来源:HaCMS开源社区 作者:zizhang 函数名: setjmp 功能: 非局部转移用法: int setjmp(jmp_buf env); 程序例: #include ; #include ; #include ; void subroutine(void); jmp_buf jumper; int main(void) { int value; value = http://linux.chinaunix.net/techdoc/develop/2006/07/30/setjmp(jumper); ...
函数名: setjmp
功 能: 非局部转移
用 法: int setjmp(jmp_buf env);
程序例:
#include ;
#include ;
#include ;
void subroutine(void);
jmp_buf jumper;
int main(void)
{
int value;
value = http://linux.chinaunix.net/techdoc/develop/2006/07/30/setjmp(jumper);
if (value != 0)
{
printf("Longjmp with value %d\n", value);
exit(value);
}
printf("About to call subroutine ... \n");
subroutine();
return 0;
}
void subroutine(void)
{
longjmp(jumper,1);
}
函数名: setlinestyle
功 能: 设置当前画线宽度和类型
用 法: void far setlinestyle(int linestype, unsigned upattern);
程序例:
#include ;
#include ;
#include ;
#include ;
#include ;
/* the names of the line styles supported */
char *lname[] = {
"SOLID_LINE",
"DOTTED_LINE",
"CENTER_LINE",
"DASHED_LINE",
"USERBIT_LINE"
};
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int style, midx, midy, userpat;
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("ress any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* a user defined line pattern */
/* binary: "0000000000000001" */
userpat = 1;
for (style=SOLID_LINE; style函数名: setmem
功 能: 存值到存储区
用 法: void setmem(void *addr, int len, char value);
程序例:
#include ;
#include ;
#include ;
int main(void)
{
char *dest;
dest = calloc(21, sizeof(char));
setmem(dest, 20, 'c');
printf("%s\n", dest);
return 0;
}
函数名: setmode
功 能: 设置打开文件方式
用 法: int setmode(int handle, unsigned mode);
程序例:
#include ;
#include ;
#include ;
int main(void)
{
int result;
result = setmode(fileno(stdprn), O_TEXT);
if (result == -1)
perror("Mode not available\n");
else
printf("Mode successfully switched\n");
return 0;
}
函数名: setpalette
功 能: 改变调色板的颜色
用 法: void far setpalette(int index, int actural_color);
程序例:
#include ;
#include ;
#include ;
#include ;
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
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("ress any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
maxcolor = getmaxcolor();
ht = 2 * textheight("W");
/* display the default colors */
for (color=1; color函数名: setrgbpalette
功 能: 定义IBM8514图形卡的颜色
用 法: void far setrgbpalette(int colornum, int red, int green, int blue);
程序例:
#include ;
#include ;
#include ;
#include ;
int main(void)
{
/* select a driver and mode that supports the use */
/* of the setrgbpalette function. */
int gdriver = VGA, gmode = VGAHI, errorcode;
struct palettetype pal;
int i, ht, y, xmax;
/* 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 */
}
/* grab a copy of the palette */
getpalette(&pal);
/* create gray scale */
for (i=0; i函数名: settextjustify
功 能: 为图形函数设置文本的对齐方式
用 法: void far settextjustify(int horiz, int vert);
程序例:
#include ;
#include ;
#include ;
#include ;
/* function prototype */
void xat(int x, int y);
/* horizontal text justification settings */
char *hjust[] = { "LEFT_TEXT",
"CENTER_TEXT",
"RIGHT_TEXT"
};
/* vertical text justification settings */
char *vjust[] = { "LEFT_TEXT",
"CENTER_TEXT",
"RIGHT_TEXT"
};
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int midx, midy, hj, vj;
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("ress any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* loop through text justifications */
for (hj=LEFT_TEXT; hj函数名: settextstyle
功 能: 为图形输出设置当前的文本属性
用 法: void far settextstyle (int font, int direction, char size);
程序例:
#include ;
#include ;
#include ;
#include ;
/* the names of the text styles supported */
char *fname[] = { "DEFAULT font",
"TRIPLEX font",
"SMALL font",
"SANS SERIF font",
"GOTHIC font"
};
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int style, midx, midy;
int size = 1;
/* 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;
settextjustify(CENTER_TEXT, CENTER_TEXT);
/* loop through the available text styles */
for (style=DEFAULT_FONT; style函数名: settextstyle
功 能: 为图形输出设置当前的文本属性
用 法: void far settextstyle (int font, int direction, char size);
程序例:
#include ;
#include ;
#include ;
#include ;
/* the names of the text styles supported */
char *fname[] = { "DEFAULT font",
"TRIPLEX font",
"SMALL font",
"SANS SERIF font",
"GOTHIC font"
};
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int style, midx, midy;
int size = 1;
/* 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;
settextjustify(CENTER_TEXT, CENTER_TEXT);
/* loop through the available text styles */
for (style=DEFAULT_FONT; style函数名: settime
功 能: 设置系统时间
用 法: void settime(struct time *timep);
程序例:
#include ;
#include ;
int main(void)
{
struct time t;
gettime(&t);
printf("The current minute is: %d\n", t.ti_min);
printf("The current hour is: %d\n", t.ti_hour);
printf("The current hundredth of a second is: %d\n", t.ti_hund);
printf("The current second is: %d\n", t.ti_sec);
/* Add one to the minutes struct element and then call settime */
t.ti_min++;
settime(&t);
return 0;
}
函数名: setusercharsize
功 能: 为矢量字体改变字符宽度和高度
用 法: void far setusercharsize(int multx, int dirx, int multy, int diry);
程序例:
#include ;
#include ;
#include ;
#include ;
int main(void)
{
/* request autodetection */
int gdriver = DETECT, gmode, errorcode;
/* 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 */
}
/* select a text style */
settextstyle(TRIPLEX_FONT, HORIZ_DIR, 4);
/* move to the text starting position */
moveto(0, getmaxy() / 2);
/* output some normal text */
outtext("Norm ");
/* make the text 1/3 the normal width */
setusercharsize(1, 3, 1, 1);
outtext("Short ");
/* make the text 3 times normal width */
setusercharsize(3, 1, 1, 1);
outtext("Wide");
/* clean up */
getch();
closegraph();
return 0;
}
函数名: setvbuf
功 能: 把缓冲区与流相关
用 法: int setvbuf(FILE *stream, char *buf, int type, unsigned size);
程序例:
#include ;
int main(void)
{
FILE *input, *output;
char bufr[512];
input = fopen("file.in", "r+b");
output = fopen("file.out", "w");
/* set up input stream for minimal disk access,
using our own character buffer */
if (setvbuf(input, bufr, _IOFBF, 512) != 0)
printf("failed to set up buffer for input file\n");
else
printf("buffer set up for input file\n");
/* set up output stream for line buffering using space that
will be obtained through an indirect call to malloc */
if (setvbuf(output, NULL, _IOLBF, 132) != 0)
printf("failed to set up buffer for output file\n");
else
printf("buffer set up for output file\n");
/* perform file I/O here */
/* close files */
fclose(input);
fclose(output);
return 0;
}
函数名: setvect
功 能: 设置中断矢量入口
用 法: void setvect(int intr_num, void interrupt(*isr)());
程序例:
/***NOTE:
This is an interrupt service routine. You can NOT compile this
program with Test Stack Overflow turned on and get an executable
file which will operate correctly. */
#include ;
#include ;
#include ;
#define INTR 0X1C /* The clock tick interrupt */
void interrupt ( *oldhandler)(void);
int count=0;
void interrupt handler(void)
{
/* increase the global counter */
count++;
/* call the old routine */
oldhandler();
}
int main(void)
{
/* save the old interrupt vector */
oldhandler = getvect(INTR);
/* install the new interrupt handler */
setvect(INTR, handler);
/* loop until the counter exceeds 20 */
while (count 函数名: setverify
功 能: 设置验证状态
用 法: void setverify(int value);
程序例:
#include ;
#include ;
#include ;
int main(void)
{
int verify_flag;
printf("Enter 0 to set verify flag off\n");
printf("Enter 1 to set verify flag on\n");
verify_flag = getch() - 0;
setverify(verify_flag);
if (getverify())
printf("DOS verify flag is on\n");
else
printf("DOS verify flag is off\n");
return 0;
}
函数名: setviewport
功 能: 为图形输出设置当前视口
用 法: void far setviewport(int left, int top, int right,
int bottom, int clipflag);
程序例:
#include ;
#include ;
#include ;
#include ;
#define CLIP_ON 1 /* activates clipping in viewport */
int main(void)
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
/* 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 */
}
setcolor(getmaxcolor());
/* message in default full-screen viewport */
outtextxy(0, 0, "* 函数名: setvisualpage
功 能: 设置可见图形页号
用 法: void far setvisualpage(int pagenum);
程序例:
#include ;
#include ;
#include ;
#include ;
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("ress 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, "ress 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: setwritemode
功 能: 设置图形方式下画线的输出模式
用 法: void far setwritemode(int mode);
程序例:
#include ;
#include ;
#include ;
#include ;
int main()
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode;
int xmax, ymax;
/* 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 */
}
xmax = getmaxx();
ymax = getmaxy();
/* select XOR drawing mode */
setwritemode(XOR_PUT);
/* draw a line */
line(0, 0, xmax, ymax);
getch();
/* erase the line by drawing over it */
line(0, 0, xmax, ymax);
getch();
/* select overwrite drawing mode */
setwritemode(COPY_PUT);
/* draw a line */
line(0, 0, xmax, ymax);
/* clean up */
getch();
closegraph();
return 0;
}
函数名: signal
功 能: 设置某一信号的对应动作
用 法: int signal(int sig, sigfun fname);
程序例:
/* This example installs a signal handler routine for SIGFPE,
catches an integer overflow condition, makes an adjustment
to AX register, and returns. This example program MAY cause
your computer to crash, and will produce runtime errors
depending on which memory model is used.
*/
#pragma inline
#include ;
#include ;
void Catcher(int sig, int type, int *reglist)
{
printf("Caught it!\n");
*(reglist + 8) = 3; /* make return AX = 3 */
}
int main(void)
{
signal(SIGFPE, Catcher);
asm mov ax,07FFFH /* AX = 32767 */
asm inc ax /* cause overflow */
asm into /* activate handler */
/* The handler set AX to 3 on return. If that hadn't happened,
there would have been another exception when the next 'into'
was executed after the 'dec' instruction. */
asm dec ax /* no overflow now */
asm into /* doesn't activate */
return 0;
}
函数名: sin
功 能: 正弦函数
用 法: double sin(double x);
程序例:
#include ;
#include ;
int main(void)
{
double result, x = 0.5;
result = sin(x);
printf("The sin() of %lf is %lf\n", x, result);
return 0;
}
函数名: sinh
功 能: 双曲正弦函数
用 法: double sinh(double x);
程序例:
#include ;
#include ;
int main(void)
{
double result, x = 0.5;
result = sinh(x);
printf("The hyperbolic sin() of %lf is %lf\n", x, result);
return 0;
}
函数名: sleep
功 能: 执行挂起一段时间
用 法: unsigned sleep(unsigned seconds);
程序例:
#include ;
#include ;
int main(void)
{
int i;
for (i=1; i函数名: sopen
功 能: 打开一共享文件
用 法: int sopen(char *pathname, int access, int shflag, int permiss);
程序例:
#include ;
#include ;
#include ;
#include ;
#include ;
#include ;
int main(void)
{
int handle;
int status;
handle = sopen("c:\\autoexec.bat", O_RDONLY, SH_DENYNO, S_IREAD);
if (!handle)
{
printf("sopen failed\n");
exit(1);
}
status = access("c:\\autoexec.bat", 6);
if (status == 0)
printf("read/write access allowed\n");
else
printf("read/write access not allowed\n");
close(handle);
return 0;
}
CODE:
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函数名: sound
功 能: 以指定频率打开PC扬声器
用 法: void sound(unsigned frequency);
程序例:
/* Emits a 7-Hz tone for 10 seconds.
Your PC may not be able to emit a 7-Hz tone. */
#include ;
int main(void)
{
sound(7);
delay(10000);
nosound();
return 0;
}
函数名: spawnl
功 能: 创建并运行子程序
用 法: int spawnl(int mode, char *pathname, char *arg0,
arg1, ... argn, NULL);
程序例:
#include ;
#include ;
#include ;
int main(void)
{
int result;
clrscr();
result = spawnl(P_WAIT, "tcc.exe", NULL);
if (result == -1)
{
perror("Error from spawnl");
exit(1);
}
return 0;
}
函数名: spawnle
功 能: 创建并运行子程序
用 法: int spawnle(int mode, char *pathname, char *arg0,
arg1,..., argn, NULL);
程序例:
/* spawnle() example */
#include ;
#include ;
#include ;
int main(void)
{
int result;
clrscr();
result = spawnle(P_WAIT, "tcc.exe", NULL, NULL);
if (result == -1)
{
perror("Error from spawnle");
exit(1);
}
return 0;
}
函数名: sprintf
功 能: 送格式化输出到字符串中
用 法: int sprintf(char *string, char *farmat [,argument,...]);
程序例:
#include ;
#include ;
int main(void)
{
char buffer[80];
sprintf(buffer, "An approximation of Pi is %f\n", M_PI);
puts(buffer);
return 0;
}
函数名: sqrt
功 能: 计算平方根
用 法: double sqrt(double x);
程序例:
#include ;
#include ;
int main(void)
{
double x = 4.0, result;
result = sqrt(x);
printf("The square root of %lf is %lf\n", x, result);
return 0;
}
函数名: srand
功 能: 初始化随机数发生器
用 法: void srand(unsigned seed);
程序例:
#include ;
#include ;
#include ;
int main(void)
{
int i;
time_t t;
srand((unsigned) time(&t)); %
发表评论
-
Linux C语言常用函数 05
2012-08-31 12:17 1021函数名: poke 功 能: 存值到一个给定存储 ... -
Linux C语言常用函数 04
2012-08-31 12:17 1178函数名: hypot 功 能: 计算直角三角形的 ... -
Linux C语言常用函数 03
2012-08-31 12:17 1218函数名: gcvt 功 能: 把浮点数转换成字符串 ... -
Linux C语言常用函数 02
2012-08-29 09:53 1052函数名: detectgraph 功 能: 通过检测 ... -
Linux C语言常用函数 01
2012-08-29 09:53 1858函数名: abort 功 能: 异常终止一个进程 ... -
C++笔试题
2012-08-29 09:48 8521、C++的类和C里面的struct有什么区别？ 答： ... -
C 笔试面试题
2012-08-28 14:08 8421、堆栈溢出一般是由什 ... -
C,C++常见面试笔试题-04（常见）
2012-08-19 13:53 10521.求下面函数的返回 ... -
C,C++常见面试笔试题-03（高质量编程）
2012-08-19 13:50 24583 高质量编程C/C++ 一、请填写BOOL , fl ... -
C,C++常见面试笔试题-02（网络）
2012-08-19 13:46 9372网络知识 2.1 OSI和TCP ... -
C,C++常见面试笔试题-01（编程基础）
2012-08-19 13:44 25891 编程基础 1.1 基本概 ...
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