int result; 

result = setmode(fileno(stdprn), O_TEXT); 
if (result == -1) 
perror("Mode not available\n"); 
else 
printf("Mode successfully switched\n"); 
return 0; 
} 




函數(shù)名: setpalette 
功 能: 改變調(diào)色板的顏色 
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("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; 
} 



函數(shù)名: setrgbpalette 
功 能: 定義IBM8514圖形卡的顏色 
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("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], 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; 
} 




函數(shù)名: settextjustify 
功 能: 為圖形函數(shù)設(shè)置文本的對齊方式 
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("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); 
} 



函數(shù)名: settextstyle 
功 能: 為圖形輸出設(shè)置當(dāng)前的文本屬性 
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("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; 
} 



函數(shù)名: settextstyle 
功 能: 為圖形輸出設(shè)置當(dāng)前的文本屬性 
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("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; 
} 



函數(shù)名: settime 
功 能: 設(shè)置系統(tǒng)時(shí)間 
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; 
} 



函數(shù)名: setusercharsize 
功 能: 為矢量字體改變字符寬度和高度 
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("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; 
} 


函數(shù)名: setvbuf 
功 能: 把緩沖區(qū)與流相關(guān) 
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; 
} 




函數(shù)名: setvect 
功 能: 設(shè)置中斷矢量入口 
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\n",count); 

/* reset the old interrupt handler */ 
setvect(INTR, oldhandler); 

return 0; 
} 



函數(shù)名: setverify 
功 能: 設(shè)置驗(yàn)證狀態(tài) 
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; 
} 



函數(shù)名: setviewport 
功 能: 為圖形輸出設(shè)置當(dāng)前視口 
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("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; 
}