C语言的函数!

内财数模协会 · 发表于 2004-5-10 16:35:05

<

>函数名: setbkcolor
功能: 用调色板设置当前背景颜色
用法: void far setbkcolor(int color);
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 */
/* multiple background colors. */
int gdriver = EGA, gmode = EGAHI, errorcode;
int bkcol, maxcolor, x, y;
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 */
} /* maximum color index supported */
maxcolor = getmaxcolor(); /* for centering text messages */
settextjustify(CENTER_TEXT, CENTER_TEXT);
x = getmaxx() / 2;
y = getmaxy() / 2; /* loop through the available colors */
for (bkcol=0; bkcol<=maxcolor; bkcol++)
{
 /* clear the screen */
 cleardevice(); /* select a new background color */
 setbkcolor(bkcol); /* output a messsage */
 if (bkcol == WHITE)
 setcolor(EGA_BLUE);
 sprintf(msg, "Background color: %d", bkcol);
 outtextxy(x, y, msg);
 getch();
} /* clean up */
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:35:16

<

>函数名: setblock
功能: 修改先前已分配的DOS存储段大小
用法: int setblock(int seg, int newsize);
程序例: <

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

>int main(void)
{
unsigned int size, segp;
int stat; size = 64; /* (64 x 16) = 1024 bytes */
stat = allocmem(size, &segp);
if (stat == -1)
 printf("Allocated memory at segment: %X\n", segp);
else
{
 printf("Failed: maximum number of paragraphs available is %d\n",
 stat);
 exit(1);
} stat = setblock(segp, size * 2);
if (stat == -1)
 printf("Expanded memory block at segment: %X\n", segp);
else
 printf("Failed: maximum number of paragraphs available is %d\n",
 stat); freemem(segp); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:36:10

<

>函数名: setbuf
功能: 把缓冲区与流相联
用法: void setbuf(FILE *steam, char *buf);
程序例: <

>#include <stdio.h> <

>/* BUFSIZ is defined in stdio.h */
char outbuf[BUFSIZ]; int main(void)
{
/* attach a buffer to the standard output stream */
setbuf(stdout, outbuf); /* put some characters into the buffer */
puts("This is a test of buffered output.\n\n");
puts("This output will go into outbuf\n");
puts("and won't appear until the buffer\n");
puts("fills up or we flush the stream.\n"); /* flush the output buffer */
fflush(stdout); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:36:20

<

>函数名: setcbrk
功能: 设置Control-break
用法: int setcbrk(int value);
程序例: <

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

>int main(void)
{
int break_flag; printf("Enter 0 to turn control break off\n");
printf("Enter 1 to turn control break on\n"); break_flag = getch() - 0; setcbrk(break_flag); if (getcbrk())
 printf("Cntrl-brk flag is on\n");
else
 printf("Cntrl-brk flag is off\n");
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:36:33

<

>函数名: setcolor
功能: 设置当前画线颜色
用法: void far setcolor(int color);
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 */
/* multiple drawing colors. */
int gdriver = EGA, gmode = EGAHI, errorcode;
int color, maxcolor, x, y;
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 */
} /* maximum color index supported */
maxcolor = getmaxcolor(); /* for centering text messages */
settextjustify(CENTER_TEXT, CENTER_TEXT);
x = getmaxx() / 2;
y = getmaxy() / 2; /* loop through the available colors */
for (color=1; color<=maxcolor; color++)
{
 /* clear the screen */
 cleardevice(); /* select a new background color */
 setcolor(color); /* output a messsage */
 sprintf(msg, "Color: %d", color);
 outtextxy(x, y, msg);
 getch();
} /* clean up */
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:36:45

<

>函数名: setdate
功能: 设置DOS日期
用法: void setdate(struct date *dateblk);
程序例: <

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

>int main(void)
{
struct date reset;
struct date save_date; getdate(&save_date);
printf("Original date:\n");
system("date"); reset.da_year = 2001;
reset.da_day = 1;
reset.da_mon = 1;
setdate(&reset); printf("Date after setting:\n");
system("date"); setdate(&save_date);
printf("Back to original date:\n");
system("date"); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:37:03

<

>函数名: setdisk
功能: 设置当前磁盘驱动器
用法: int setdisk(int drive);
程序例: <

>#include <stdio.h>
#include <dir.h> <

>int main(void)
{
int save, disk, disks; /* save original drive */
save = getdisk(); /* print number of logic drives */
disks = setdisk(save);
printf("%d logical drives on the system\n\n", disks); /* print the drive letters available */
printf("Available drives:\n");
for (disk = 0;disk < 26;++disk)
{
 setdisk(disk);
 if (disk == getdisk())
 printf("%c: drive is available\n", disk + 'a');
}
setdisk(save); return 0;
}

内财数模协会 · 发表于 2004-5-10 16:37:27

<

>函数名: setdta
功能: 设置磁盘传输区地址
用法: void setdta(char far *dta);
程序例: <

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

>int main(void)
{
char line[80], far *save_dta;
char buffer[256] = "SETDTA test!";
struct fcb blk;
int result; /* get new file name from user */
printf("Enter a file name to create:");
gets(line); /* parse the new file name to the dta */
parsfnm(line, &blk, 1);
printf("%d %s\n", blk.fcb_drive, blk.fcb_name); /* request DOS services to create file */
if (bdosptr(0x16, &blk, 0) == -1)
{
 perror("Error creating file");
 exit(1);
} /* save old dta and set new dta */
save_dta = getdta();
setdta(buffer); /* write new records */
blk.fcb_recsize = 256;
blk.fcb_random = 0L;
result = randbwr(&blk, 1);
printf("result = %d\n", result); if (!result)
 printf("Write OK\n");
else
{
 perror("Disk error");
 exit(1);
} /* request DOS services to close the file */
if (bdosptr(0x10, &blk, 0) == -1)
{
 perror("Error closing file");
 exit(1);
} /* reset the old dta */
setdta(save_dta);
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:37:39

<

>函数名: setfillpattern
功能: 选择用户定义的填充模式
用法: void far setfillpattern(char far *upattern, int 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 maxx, maxy; /* a user defined fill pattern */
char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24, 0x07, 0x00}; /* 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); /* clean up */
getch();
closegraph();
return 0;
}

内财数模协会 · 发表于 2004-5-10 16:37:54

<

>函数名: setfillstyle
功能: 设置填充模式和颜色
用法: void far setfillstyle(int pattern, int color);
程序例: <

>#include <graphics.h>
#include <stdlib.h>
#include <string.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;
int style, midx, midy;
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\n", grapherrormsg(errorcode));
 printf("Press any key to halt:");
 getch();
 exit(1); /* terminate with an error code */
} midx = getmaxx() / 2;
midy = getmaxy() / 2; for (style = EMPTY_FILL; style < USER_FILL; style++)
{
 /* select the fill style */
 setfillstyle(style, getmaxcolor()); /* convert style into a string */
 strcpy(stylestr, fname[style]); /* fill a bar */
 bar3d(0, 0, midx-10, midy, 0, 0); /* output a message */
 outtextxy(midx, midy, stylestr); /* wait for a key */
 getch();
 cleardevice();
} /* clean up */
getch();
closegraph();
return 0;
}

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