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<BR>}
<BR>
<BR>
<P>函數名: rectangle
<BR>功 能: 畫一個矩形
<BR>用 法: void far rectangle(int left, int top, int right, int bottom);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int left, top, right, bottom;
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<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> }
<P> left = getmaxx() / 2 - 50;
<BR> top = getmaxy() / 2 - 50;
<BR> right = getmaxx() / 2 + 50;
<BR> bottom = getmaxy() / 2 + 50;
<P> /* draw a rectangle */
<BR> rectangle(left,top,right,bottom);
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: registerbgidriver
<BR>功 能: 登錄已連接進來的圖形驅動程序代碼
<BR>用 法: int registerbgidriver(void(*driver)(void));
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<P> /* register a driver that was added into graphics.lib */
<BR> errorcode = registerbgidriver(EGAVGA_driver);
<P> /* report any registration errors */
<BR> if (errorcode < 0)
<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> }
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<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> }
<P> /* draw a line */
<BR> line(0, 0, getmaxx(), getmaxy());
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: remove
<BR>功 能: 刪除一個文件
<BR>用 法: int remove(char *filename);
<BR>程序例:
<P>#include <stdio.h>
<P>int main(void)
<BR>{
<BR> char file[80];
<P> /* prompt for file name to delete */
<BR> printf("File to delete: ");
<BR> gets(file);
<P> /* delete the file */
<BR> if (remove(file) == 0)
<BR> printf("Removed %s.\n",file);
<BR> else
<BR> perror("remove");
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: rename
<BR>功 能: 重命名文件
<BR>用 法: int rename(char *oldname, char *newname);
<BR>程序例:
<P>#include <stdio.h>
<P>int main(void)
<BR>{
<BR> char oldname[80], newname[80];
<P> /* prompt for file to rename and new name */
<BR> printf("File to rename: ");
<BR> gets(oldname);
<BR> printf("New name: ");
<BR> gets(newname);
<P> /* Rename the file */
<BR> if (rename(oldname, newname) == 0)
<BR> printf("Renamed %s to %s.\n", oldname,
newname);
<BR> else
<BR> perror("rename");
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: restorecrtmode
<BR>功 能: 將屏幕模式恢復為先前的imitgraph設置
<BR>用 法: void far restorecrtmode(void);
<BR>程序例:
<P>#include <graphics.h>
<BR>#include <stdlib.h>
<BR>#include <stdio.h>
<BR>#include <conio.h>
<P>int main(void)
<BR>{
<BR> /* request auto detection */
<BR> int gdriver = DETECT, gmode, errorcode;
<BR> int x, y;
<P> /* initialize graphics and local variables */
<BR> initgraph(&gdriver, &gmode, "");
<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> }
<P> x = getmaxx() / 2;
<BR> y = getmaxy() / 2;
<P> /* output a message */
<BR> settextjustify(CENTER_TEXT, CENTER_TEXT);
<BR> outtextxy(x, y, "Press any key to exit graphics:");
<BR> getch();
<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();
<P> /* return to graphics mode */
<BR> setgraphmode(getgraphmode());
<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:");
<P> /* clean up */
<BR> getch();
<BR> closegraph();
<BR> return 0;
<BR>}
<BR>
<BR>
<P>函數名: rewind
<BR>功 能: 將文件指針重新指向一個流的開頭
<BR>用 法: int rewind(FILE *stream);
<BR>程序例:
<P>#include <stdio.h>
<BR>#include <dir.h>
<P> int main(void)
<BR> {
<BR> FILE *fp;
<BR> char *fname = "TXXXXXX", *newname, first;
<P> newname = mktemp(fname);
<BR> fp = fopen(newname,"w+");
<BR> fprintf(fp,"abcdefghijklmnopqrstuvwxyz");
<BR> rewind(fp);
<BR> fscanf(fp,"%c",&first);
<BR> printf("The first character is: %c\n",first);
<BR> fclose(fp);
<BR> remove(newname);
<P> return 0;
<BR>}
<BR>
<BR>
<P>函數名: rmdir
<BR>功 能: 刪除DOS文件目錄
<BR>用 法: int rmdir(char *stream);
<BR>程序例:
<P>#include <stdio.h>
<BR>#include <conio.h>
<BR>#include <process.h>
<BR>#include <dir.h>
<P>#define DIRNAME "testdir.$$$"
<P>int main(void)
<BR>{
<BR> int stat;
<P> stat = mkdir(DIRNAME);
<BR> if (!stat)
<BR> printf("Directory
created\n");
<BR> else
<BR> {
<BR> printf("Unable to create directory\n");
<BR> exit(1);
<BR> }
<P> getch();
<BR> system("dir/p");
<BR> getch();
<P> stat = rmdir(DIRNAME);
<BR> if (!stat)
<BR> printf("\nDirectory
deleted\n");
<BR> else
<BR> {
<BR> perror("\nUnable to delete directory\n");
<BR> exit(1);
<BR> }
<P> return 0;
<BR>}
<BR>
<P>
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