g函数.txt

C语言函数..应用示例

      printf("Press any key to halt:");
      getch();
/* terminate with an error code */
      exit(1);
   }

   setcolor(getmaxcolor());

/* get name of the device driver in use */
   drivername = getdrivername();

/* for centering text on the screen */
   settextjustify(CENTER_TEXT, CENTER_TEXT);

/* output the name of the driver */
   outtextxy(getmaxx() / 2, getmaxy() / 2,
      drivername);

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

函数名: getdta
功  能: 取磁盘传输地址
用  法: char far *getdta(void);
程序例:

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

int main(void)
{
   char far *dta;

   dta = getdta();
   printf("The current disk transfer \
   address is: %Fp\n", dta);
   return 0;
}
 
 

函数名: getenv
功  能: 从环境中取字符串
用  法: char *getenv(char *envvar);
程序例:

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

int main(void)
{
    char *s;

    s=getenv("COMSPEC");       /* get the comspec environment parameter */
    printf("Command processor: %s\n",s);   /* display comspec parameter */

    return 0;
}
 
 
 

函数名: getfat, getfatd
功  能: 取文件分配表信息
用  法: void getfat(int drive, struct fatinfo *fatblkp);
程序例:

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

int main(void)
{
   struct fatinfo diskinfo;
   int flag = 0;

   printf("Please insert disk in drive A\n");
   getchar();

   getfat(1, &diskinfo);
/* get drive information */

   printf("\nDrive A: is ");
   switch((unsigned char) diskinfo.fi_fatid)
   {
      case 0xFD:
 printf("360K low density\n");
 break;

      case 0xF9:
 printf("1.2 Meg high density\n");
 break;

      default:
 printf("unformatted\n");
 flag = 1;
   }

   if (!flag)
   {
      printf("  sectors per cluster %5d\n",
       diskinfo.fi_sclus);
      printf("   number of clusters %5d\n",
       diskinfo.fi_nclus);
      printf("     bytes per sector %5d\n",
       diskinfo.fi_bysec);
   }

   return 0;
}
 
 

函数名: getfillpattern
功  能: 将用户定义的填充模式拷贝到内存中
用  法: void far getfillpattern(char far *upattern);
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 maxx, maxy;
   char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x25, 0x27, 0x04, 0x04};

   /* 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);

   getch();

   /* get the current user defined fill pattern */
   getfillpattern(pattern);

   /* alter the pattern we grabbed */
   pattern[4] -= 1;
   pattern[5] -= 3;
   pattern[6] += 3;
   pattern[7] -= 4;

   /* select our new pattern */
   setfillpattern(pattern, getmaxcolor());

   /* fill the screen with the new pattern */
   bar(0, 0, maxx, maxy);

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

函数名: getfillsettings
功  能: 取得有关当前填充模式和填充颜色的信息
用  法: void far getfillsettings(struct fillsettingstype far *fillinfo);
程序例:

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

/  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;
   struct fillsettingstype fillinfo;
   int midx, midy;
   char patstr[40], colstr[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;

   /* get information about current fill pattern and color */
   getfillsettings(&fillinfo);

   /* convert fill information into strings */
   sprintf(patstr, "%s is the fill style.", fname[fillinfo.pattern]);
   sprintf(colstr, "%d is the fill color.", fillinfo.color);

   /* display the information */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
   outtextxy(midx, midy, patstr);
   outtextxy(midx, midy+2*textheight("W"), colstr);

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

函数名: getftime
功  能: 取文件日期和时间
用  法: int getftime(int handle, struct ftime *ftimep);
程序例:

#include <stdio.h>
#include <io.h>

int main(void)
{
   FILE *stream;
   struct ftime ft;

   if ((stream = fopen("TEST.$$$",
        "wt")) == NULL)
   {
      fprintf(stderr,
             "Cannot open output file.\n");
      return 1;
   }
   getftime(fileno(stream), &ft);
   printf("File time: %u:%u:%u\n",
          ft.ft_hour, ft.ft_min,
          ft.ft_tsec * 2);
   printf("File date: %u/%u/%u\n",
   ft.ft_month, ft.ft_day,
   ft.ft_year+1980);
   fclose(stream);
   return 0;
}
 
 
 

函数名: getgraphmode
功  能: 返回当前图形模式
用  法: int far getgraphmode(void);
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 midx, midy, mode;
   char numname[80], modename[80];

/* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");

/* read result of initialization */
   errorcode = graphresult();
/* an error occurred */
   if (errorcode != grOk)
   {
      printf("Graphics error: %s\n",
             grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
/* terminate with an error code */
      exit(1);
   }

   midx = getmaxx() / 2;
   midy = getmaxy() / 2;

/* get mode number and name strings */
   mode = getgraphmode();
   sprintf(numname,
           "%d is the current mode number.",
           mode);
   sprintf(modename,
           "%s is the current graphics mode",
           getmodename(mode));

/* display the information */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
   outtextxy(midx, midy, numname);
   outtextxy(midx, midy+2*textheight("W"),
             modename);

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

函数名: getftime
功  能: 取文件日期和时间
用  法: int getftime(int handle, struct ftime *ftimep);
程序例:

#include <stdio.h>
#include <io.h>

int main(void)
{
   FILE *stream;
   struct ftime ft;

   if ((stream = fopen("TEST.$$$",
        "wt")) == NULL)
   {
      fprintf(stderr,
             "Cannot open output file.\n");
      return 1;
   }
   getftime(fileno(stream), &ft);
   printf("File time: %u:%u:%u\n",
          ft.ft_hour, ft.ft_min,
          ft.ft_tsec * 2);
   printf("File date: %u/%u/%u\n",
   ft.ft_month, ft.ft_day,
   ft.ft_year+1980);
   fclose(stream);
   return 0;
}
 
 
 

函数名: getgraphmode
功  能: 返回当前图形模式
用  法: int far getgraphmode(void);
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 midx, midy, mode;
   char numname[80], modename[80];

/* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");

/* read result of initialization */
   errorcode = graphresult();
/* an error occurred */
   if (errorcode != grOk)
   {
      printf("Graphics error: %s\n",
             grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
/* terminate with an error code */
      exit(1);
   }

   midx = getmaxx() / 2;
   midy = getmaxy() / 2;

/* get mode number and name strings */
   mode = getgraphmode();
   sprintf(numname,
           "%d is the current mode number.",
           mode);
   sprintf(modename,
           "%s is the current graphics mode",
           getmodename(mode));

/* display the information */
   settextjustify(CENTER_TEXT, CENTER_TEXT);
   outtextxy(midx, midy, numname);
   outtextxy(midx, midy+2*textheight("W"),
             modename);

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

函数名: getimage
功  能: 将指定区域的一个位图存到主存中
用  法: void far getimage(int left, int top, int right, int bottom,
     void far *bitmap);
程序例:

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

void save_screen(void far *buf[4]);
void restore_screen(void far *buf[4]);

int maxx, maxy;

int main(void)
{
   int gdriver=DETECT, gmode, errorcode;
   void far *ptr[4];

   /* auto-detect the graphics driver and mode */
   initgraph(&gdriver, &gmode, "");
   errorcode = graphresult(); /* check for any errors */
   if (errorcode != grOk)
   {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to halt:");
      getch();
      exit(1);
   }
   maxx = getmaxx();
   maxy = getmaxy();

   /* draw an image on the screen */
   rectangle(0, 0, maxx, maxy);
   line(0, 0, maxx, maxy);
   line(0, maxy, maxx, 0);

   save_screen(ptr);    /* save the current screen */
   getch();             /* pause screen */
   cleardevice();       /* clear screen */
   restore_screen(ptr); /* restore the screen */
   getch();             /* pause screen */

   closegraph();
   return 0;
}

void save_screen(void far *buf[4])
{
   unsigned size;
   int ystart=0, yend, yincr, block;

   yincr = (maxy+1) / 4;
   yend = yincr;
   size = imagesize(0, ystart, maxx, yend); /* get byte size of image */

   for (block=0; block<=3; block++)
   {
      if ((buf[block] = farmalloc(size)) == NULL)
      {
         closegraph();
         printf("Error: not enough heap space in save_screen().\n");
  exit(1);
      }

      getimage(0, ystart, maxx, yend, buf[block]);
      ystart = yend + 1;
      yend += yincr + 1;
   }
}

void save_screen(void far *buf[4])
{
   unsigned size;
   int ystart=0, yend, yincr, block;

   yincr = (maxy+1) / 4;
   yend = yincr;
   size = imagesize(0, ystart, maxx, yend); /* get byte size of image */

   for (block=0; block<=3; block++)
   {
      if ((buf[block] = farmalloc(size)) == NULL)
      {
         closegraph();
         printf("Error: not enough heap space in save_screen().\n");
  exit(1);
      }

      getimage(0, ystart, maxx, yend, buf[block]);
      ystart = yend + 1;
      yend += yincr + 1;
   }
}

void restore_screen(void far *buf[4])
{
   int ystart=0, yend, yincr, block;

   yincr = (maxy+1) / 4;
   yend = yincr;

   for (block=0; block<=3; block++)
   {
      putimage(0, ystart, buf[block], COPY_PUT);
      farfree(buf[block]);
      ystart = yend + 1;
      yend += yincr + 1;
   }
}
 
 

函数名: getlinesettings
功  能: 取当前线型、模式和宽度
用  法: void far getlinesettings(struct linesettingstype far *lininfo):
程序例:

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

/* 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;
   struct linesettingstype lineinfo;
   int midx, midy;
   char lstyle[80], lpattern[80], lwidth[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;

   /* get information about current line settings */
   getlinesettings(&lineinfo);

   /* convert line information into strings */
   sprintf(lstyle, "%s is the line style.",
           lname[lineinfo.linestyle]);
   sprintf(lpattern, "0x%X is the user-defined line pattern.",
           lineinfo.upattern);
   sprintf(lwidth, "%d is the line thickness.",
    lineinfo.thickness);