c语言函数大全

墙角野猫

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.$$$", "w")) == NULL)
{
perror("Error:");
exit(1);
}
fprintf(fp, "testing...
");
/* load ftime structure with new time and date */
filet.ft_tsec = 1;
filet.ft_min = 1;
filet.ft_hour = 1;
filet.ft_day = 1;
filet.ft_month = 1;
filet.ft_year = 21;
/* show current directory for time and date */
system("dir TEST.$$$");
/* 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;
}

墙角野猫

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
", 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;
}

墙角野猫

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
", 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.
");
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;
}

墙角野猫

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 = setjmp(jumper);
if (value != 0)
{
printf("Longjmp with value %d
", value);
exit(value);
}
printf("About to call subroutine ...
");
subroutine();
return 0;
}
void subroutine(void)
{
longjmp(jumper,1);
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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<=USERBIT_LINE; style++)
{
/* select the line style */
setlinestyle(style, userpat, 1);
/* convert style into a string */
strcpy(stylestr, lname[style]);
/* draw a line */
line(0, 0, midx-10, midy);
/* draw a rectangle */
rectangle(0, 0, getmaxx(), getmaxy());
/* output a message */
outtextxy(midx, midy, stylestr);
/* wait for a key */
getch();
cleardevice();
}
/* clean up */
closegraph();
return 0;
}

墙角野猫

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, &#39;c&#39;);
printf("%s
", dest);
return 0;
}

墙角野猫

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
");
else
printf("Mode successfully switched
");
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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<=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();
}
/* clean up */
closegraph();
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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 setrgbpalette(pal.colors, i*4, i*4, i*4);
/* display the gray scale */
ht = getmaxy() / 16;
xmax = getmaxx();
y = 0;
for (i=0; i {
setfillstyle(SOLID_FILL, i);
bar(0, y, xmax, y+ht);
y += ht;
}
/* clean up */
getch();
closegraph();
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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<=RIGHT_TEXT; hj++)
for (vj=LEFT_TEXT; vj<=RIGHT_TEXT; vj++)
{
cleardevice();
/* set the text justification */
settextjustify(hj, vj);
/* create a message string */
sprintf(msg, "%s %s", hjust[hj], vjust[vj]);
/* create cross hairs on the screen */
xat(midx, midy);
/* output the message */
outtextxy(midx, midy, msg);
getch();
}
/* clean up */
closegraph();
return 0;
}
/* draw an "x" at (x, y) */
void xat(int x, int y)
{
line(x-4, y, x+4, y);
line(x, y-4, x, y+4);
}