📄 036.htm
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<P> /* write new records */
<BR> blk.fcb_recsize = 256;
<BR> blk.fcb_random = 0L;
<BR> result = randbwr(&blk, 1);
<BR> printf("result = %d\n", result);
<BR>
<P> if (!result)
<BR> printf("Write OK\n");
<BR> else
<BR> {
<BR> perror("Disk error");
<BR> exit(1);
<BR> }
<BR>
<P> /* request DOS services to close the file */
<BR> if (bdosptr(0x10, &blk, 0) == -1)
<BR> {
<BR> perror("Error closing file");
<BR> exit(1);
<BR> }
<BR>
<P> /* reset the old dta */
<BR> setdta(save_dta);
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函数名: setfillpattern
<BR>功 能: 选择用户定义的填充模式
<BR>用 法: void far setfillpattern(char far *upattern, int color);
<BR>程序例:
<BR>
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<BR>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int maxx, maxy;
<BR>
<P> /* a user defined fill pattern */
<BR> char pattern[8] = {0x00, 0x70, 0x20, 0x27, 0x24, 0x24,
0x07, 0x00};
<BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<BR>
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<BR>
<P> maxx = getmaxx();
<BR> maxy = getmaxy();
<BR> setcolor(getmaxcolor());
<BR>
<P> /* select a user defined fill pattern */
<BR> setfillpattern(pattern, getmaxcolor());
<BR>
<P> /* fill the screen with the pattern */
<BR> bar(0, 0, maxx, maxy);
<BR>
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函数名: setfillstyle
<BR>功 能: 设置填充模式和颜色
<BR>用 法: void far setfillstyle(int pattern, int color);
<BR>程序例:
<BR>
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <string.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<BR>
<P>/* the names of the fill styles supported */
<BR>char *fname[] = { "EMPTY_FILL",
<BR>
"SOLID_FILL",
<BR>
"LINE_FILL",
<BR>
"LTSLASH_FILL",
<BR>
"SLASH_FILL",
<BR>
"BKSLASH_FILL",
<BR>
"LTBKSLASH_FILL",
<BR> "HATCH_FILL",
<BR>
"XHATCH_FILL",
<BR>
"INTERLEAVE_FILL",
<BR>
"WIDE_DOT_FILL",
<BR>
"CLOSE_DOT_FILL",
<BR> "USER_FILL"
<BR>
};
<BR>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int style, midx, midy;
<BR> char stylestr[40];
<BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<BR>
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<BR>
<P> midx = getmaxx() / 2;
<BR> midy = getmaxy() / 2;
<BR>
<P> for (style = EMPTY_FILL; style < USER_FILL; style++)
<BR> {
<BR> /* select the fill style */
<BR> setfillstyle(style, getmaxcolor());
<BR>
<P> /* convert style into a string */
<BR> strcpy(stylestr, fname[style]);
<BR>
<P> /* fill a bar */
<BR> bar3d(0, 0, midx-10, midy, 0, 0);
<BR>
<P> /* output a message */
<BR> outtextxy(midx, midy, stylestr);
<BR>
<P> /* wait for a key */
<BR> getch();
<BR> cleardevice();
<BR> }
<BR>
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函数名: setftime
<BR>功 能: 设置文件日期和时间
<BR>用 法: int setftime(int handle, struct ftime *ftimep);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <process.h>
<BR>#include <fcntl.h>
<BR>#include <io.h>
<BR>
<P>int main(void)
<BR>{
<BR> struct ftime filet;
<BR> FILE *fp;
<BR>
<P> if ((fp = fopen("TEST.$$$", "w")) == NULL)
<BR> {
<BR> perror("Error:");
<BR> exit(1);
<BR> }
<BR>
<P> fprintf(fp, "testing...\n");
<BR>
<P> /* load ftime structure with new time and date */
<BR> filet.ft_tsec = 1;
<BR> filet.ft_min = 1;
<BR> filet.ft_hour = 1;
<BR> filet.ft_day = 1;
<BR> filet.ft_month = 1;
<BR> filet.ft_year = 21;
<BR>
<P> /* show current directory for time and date */
<BR> system("dir TEST.$$$");
<BR>
<P> /* change the time and date stamp*/
<BR> setftime(fileno(fp), &filet);
<BR>
<P> /* close and remove the temporary file */
<BR> fclose(fp);
<BR>
<P> system("dir TEST.$$$");
<BR>
<P> unlink("TEST.$$$");
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<P>函数名: setgraphbufsize
<BR>功 能: 改变内部图形缓冲区的大小
<BR>用 法: unsigned far setgraphbufsize(unsigned bufsize);
<BR>程序例:
<BR>
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<BR>
<P>#define BUFSIZE 1000 /* internal graphics buffer size */
<BR>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int x, y, oldsize;
<BR> char msg[80];
<BR>
<P> /* set the size of the internal graphics buffer */
<BR> /* before making a call to initgraph.
*/
<BR> oldsize = setgraphbufsize(BUFSIZE);
<BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<BR>
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<BR>
<P> x = getmaxx() / 2;
<BR> y = getmaxy() / 2;
<BR>
<P> /* output some messages */
<BR> sprintf(msg, "Graphics buffer size: %d", BUFSIZE);
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(x, y, msg);
<BR> sprintf(msg, "Old graphics buffer size: %d", oldsize);
<BR> outtextxy(x, y+textheight("W"), msg);
<BR>
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: setgraphmode
<BR>功 能: 将系统设置成图形模式且清屏
<BR>用 法: void far setgraphmode(int mode);
<BR>程序例:
<BR>
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<BR>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int x, y;
<BR>
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<BR>
<P> /* read result of initialization */
<BR> errorcode = graphresult();
<BR> if (errorcode != grOk) /* an error occurred */
<BR> {
<BR> printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR> printf("Press any key to halt:");
<BR> getch();
<BR> exit(1); /* terminate with an error
code */
<BR> }
<BR>
<P> x = getmaxx() / 2;
<BR> y = getmaxy() / 2;
<BR>
<P> /* output a message */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(x, y, "Press any key to exit graphics:");
<BR> getch();
<BR>
<P> /* restore system to text mode */
<BR> restorecrtmode();
<BR> printf("We're now in text mode.\n");
<BR> printf("Press any key to return to graphics mode:");
<BR> getch();
<BR>
<P> /* return to graphics mode */
<BR> setgraphmode(getgraphmode());
<BR>
<P> /* output a message */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(x, y, "We're back in graphics mode.");
<BR> outtextxy(x, y+textheight("W"), "Press any key to halt:");
<BR>
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<BR>
<BR>
<P>函数名: setjmp
<BR>功 能: 非局部转移
<BR>用 法: int setjmp(jmp_buf env);
<BR>程序例:
<BR>
<P>#include <stdio.h>
<BR>#include <process.h>
<BR>#include <setjmp.h>
<BR>
<P>void subroutine(void);
<BR>
<P>jmp_buf jumper;
<BR>
<P>int main(void)
<BR>{
<BR> int value;
<BR>
<P> value = setjmp(jumper);
<BR> if (value != 0)
<BR> {
<BR> printf("Longjmp with value %d\n", value);
<BR> exit(value);
<BR> }
<BR> printf("About to call subroutine ... \n");
<BR> subroutine();
<BR> return 0;
<BR>}
<BR>
<P>void subroutine(void)
<BR>{
<BR> longjmp(jumper,1);
<BR>}
<BR>
<BR>
<BR>
<P>函数名: setlinestyle
<BR>功 能: 设置当前画线宽度和类型
<BR>用 法: void far setlinestyle(int linestype, unsigned upattern);
<BR>程序例:
<BR>
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <string.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<BR>
<P>/* the names of the line styles supported */
<BR>char *lname[] = {
<BR> "SOLID_LINE",
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