wdg_022s.txt

c编程宝典,详细介绍有关c的资料

} 
  
  
  

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

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<pal.size; 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<pal.size; i++) 
   { 
      setfillstyle(SOLID_FILL, i); 
      bar(0, y, xmax, y+ht); 
      y += ht; 
   } 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
} 
  
  
  

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

/* 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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

/* 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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

/* 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; 
} 
  
  

函数名: settime 
功  能: 设置系统时间 
用  法: void settime(struct time *timep); 
程序例: 

#include <stdio.h> 
#include <dos.h> 

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

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 <stdio.h> 

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 <stdio.h> 
#include <dos.h> 
#include <conio.h> 

#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; 
} 
  
  

函数名: setverify 
功  能: 设置验证状态 
用  法: void setverify(int value); 
程序例: 

#include <stdio.h> 
#include <conio.h> 
#include <dos.h> 

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

#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; 
} 
  
  

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 <graphics.h> 
#include <stdlib.h> 
#include <stdio.h> 
#include <conio.h> 

int main(void) 
{