c语言函数大全

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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<=GOTHIC_FONT; style++)
{
cleardevice();
if (style == TRIPLEX_FONT)
size = 4;
/* select the text style */
settextstyle(style, HORIZ_DIR, size);
/* output a message */
outtextxy(midx, midy, fname[style]);
getch();
}
/* clean up */
closegraph();
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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<=GOTHIC_FONT; style++)
{
cleardevice();
if (style == TRIPLEX_FONT)
size = 4;
/* select the text style */
settextstyle(style, HORIZ_DIR, size);
/* output a message */
outtextxy(midx, midy, fname[style]);
getch();
}
/* clean up */
closegraph();
return 0;
}

墙角野猫

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
", t.ti_min);
printf("The current hour is: %d
", t.ti_hour);
printf("The current hundredth of a second is: %d
", t.ti_hund);
printf("The current second is: %d
", t.ti_sec);
/* Add one to the minutes struct element and then call settime */
t.ti_min++;
settime(&t);
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press 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;
}

墙角野猫

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
");
else
printf("buffer set up for input file
");
/* 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
");
else
printf("buffer set up for output file
");
/* perform file I/O here */
/* close files */
fclose(input);
fclose(output);
return 0;
}

墙角野猫

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 < 20)
printf("count is %d
",count);
/* reset the old interrupt handler */
setvect(INTR, oldhandler);
return 0;
}

墙角野猫

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
");
printf("Enter 1 to set verify flag on
");
verify_flag = getch() - 0;
setverify(verify_flag);
if (getverify())
printf("DOS verify flag is on
");
else
printf("DOS verify flag is off
");
return 0;
}

墙角野猫

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
", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
setcolor(getmaxcolor());
/* message in default full-screen viewport */
outtextxy(0, 0, "* <-- (0, 0) in default viewport");
/* create a smaller viewport */
setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);
/* display some text */
outtextxy(0, 0, "* <-- (0, 0) in smaller viewport");
/* clean up */
getch();
closegraph();
return 0;
}

墙角野猫

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
", 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;
}

墙角野猫

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
", 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;
}