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turbo c

<P>&nbsp;&nbsp; /* install a user defined font file */
<BR>&nbsp;&nbsp; userfont = installuserfont("USER.CHR");

<P>&nbsp;&nbsp; /* check for any installation errors */
<BR>&nbsp;&nbsp; checkerrors();

<P>&nbsp;&nbsp; /* select the user font */
<BR>&nbsp;&nbsp; settextstyle(userfont, HORIZ_DIR, 4);

<P>&nbsp;&nbsp; /* output some text */
<BR>&nbsp;&nbsp; outtextxy(midx, midy, "Testing!");

<P>&nbsp;&nbsp; /* clean up */
<BR>&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp; closegraph();
<BR>&nbsp;&nbsp; return 0;
<BR>}

<P>/* check for and report any graphics errors */
<BR>void checkerrors(void)
<BR>{
<BR>&nbsp;&nbsp; int errorcode;

<P>&nbsp;&nbsp; /* read result of last graphics operation */
<BR>&nbsp;&nbsp; errorcode = graphresult();
<BR>&nbsp;&nbsp; if (errorcode != grOk)
<BR>&nbsp;&nbsp; {
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Graphics error: %s\n", grapherrormsg(errorcode));
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Press any key to halt:");
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; getch();
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; exit(1);
<BR>&nbsp;&nbsp; }
<BR>&nbsp;}
<BR>&nbsp;
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: int86
<BR>功&nbsp; 能: 通用8086软中断接口
<BR>用&nbsp; 法: int int86(int intr_num, union REGS *inregs, union REGS
*outregs);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;conio.h>
<BR>#include &lt;dos.h>

<P>#define VIDEO 0x10

<P>void movetoxy(int x, int y)
<BR>{
<BR>&nbsp;&nbsp; union REGS regs;

<P>&nbsp;&nbsp; regs.h.ah = 2;&nbsp; /* set cursor postion */
<BR>&nbsp;&nbsp; regs.h.dh = y;
<BR>&nbsp;&nbsp; regs.h.dl = x;
<BR>&nbsp;&nbsp; regs.h.bh = 0;&nbsp; /* video page 0 */
<BR>&nbsp;&nbsp; int86(VIDEO, &amp;regs, &amp;regs);
<BR>}

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; clrscr();
<BR>&nbsp;&nbsp; movetoxy(35, 10);
<BR>&nbsp;&nbsp; printf("Hello\n");
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: int86x
<BR>功&nbsp; 能: 通用8086软中断接口
<BR>用&nbsp; 法: int int86x(int intr_num, union REGS *insegs, union REGS
*outregs,
<BR>&nbsp;&nbsp;&nbsp;&nbsp; struct SREGS *segregs);
<BR>程序例:

<P>#include &lt;dos.h>
<BR>#include &lt;process.h>
<BR>#include &lt;stdio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; char filename[80];
<BR>&nbsp;&nbsp; union REGS inregs, outregs;
<BR>&nbsp;&nbsp; struct SREGS segregs;

<P>&nbsp;&nbsp; printf("Enter filename: ");
<BR>&nbsp;&nbsp; gets(filename);
<BR>&nbsp;&nbsp; inregs.h.ah = 0x43;
<BR>&nbsp;&nbsp; inregs.h.al = 0x21;
<BR>&nbsp;&nbsp; inregs.x.dx = FP_OFF(filename);
<BR>&nbsp;&nbsp; segregs.ds = FP_SEG(filename);
<BR>&nbsp;&nbsp; int86x(0x21, &amp;inregs, &amp;outregs, &amp;segregs);
<BR>&nbsp;&nbsp; printf("File attribute: %X\n", outregs.x.cx);
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: intdos
<BR>功&nbsp; 能: 通用DOS接口
<BR>用&nbsp; 法: int intdos(union REGS *inregs, union REGS *outregs);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;dos.h>

<P>/* deletes file name; returns 0 on success, nonzero on failure */
<BR>int delete_file(char near *filename)
<BR>{
<BR>&nbsp;&nbsp; union REGS regs;
<BR>&nbsp;&nbsp; int ret;
<BR>&nbsp;&nbsp; regs.h.ah = 0x41;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
/* delete file */
<BR>&nbsp;&nbsp; regs.x.dx = (unsigned) filename;
<BR>&nbsp;&nbsp; ret = intdos(&amp;regs, &amp;regs);

<P>&nbsp;&nbsp; /* if carry flag is set, there was an error */
<BR>&nbsp;&nbsp; return(regs.x.cflag ? ret : 0);
<BR>}

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int err;
<BR>&nbsp;&nbsp; err = delete_file("NOTEXIST.$$$");
<BR>&nbsp;&nbsp; if (!err)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Able to delete NOTEXIST.$$$\n");
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Not Able to delete NOTEXIST.$$$\n");
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: intdosx
<BR>功&nbsp; 能: 通用DOS中断接口
<BR>用&nbsp; 法: int intdosx(union REGS *inregs, union REGS *outregs,
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; struct SREGS *segregs);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;dos.h>

<P>/* deletes file name; returns 0 on success, nonzero on failure */
<BR>int delete_file(char far *filename)
<BR>{
<BR>&nbsp;&nbsp; union REGS regs; struct SREGS sregs;
<BR>&nbsp;&nbsp; int ret;
<BR>&nbsp;&nbsp; regs.h.ah = 0x41;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
/* delete file */
<BR>&nbsp;&nbsp; regs.x.dx = FP_OFF(filename);
<BR>&nbsp;&nbsp; sregs.ds = FP_SEG(filename);
<BR>&nbsp;&nbsp; ret = intdosx(&amp;regs, &amp;regs, &amp;sregs);

<P>&nbsp;&nbsp; /* if carry flag is set, there was an error */
<BR>&nbsp;&nbsp; return(regs.x.cflag ? ret : 0);
<BR>}

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int err;
<BR>&nbsp;&nbsp; err = delete_file("NOTEXIST.$$$");
<BR>&nbsp;&nbsp; if (!err)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Able to delete NOTEXIST.$$$\n");
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Not Able to delete NOTEXIST.$$$\n");
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: intr
<BR>功&nbsp; 能: 改变软中断接口
<BR>用&nbsp; 法: void intr(int intr_num, struct REGPACK *preg);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;string.h>
<BR>#include &lt;dir.h>
<BR>#include &lt;dos.h>

<P>#define CF 1&nbsp; /* Carry flag */

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; char directory[80];
<BR>&nbsp;&nbsp; struct REGPACK reg;

<P>&nbsp;&nbsp; printf("Enter directory to change to: ");
<BR>&nbsp;&nbsp; gets(directory);
<BR>&nbsp;&nbsp; reg.r_ax = 0x3B &lt;&lt; 8;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
/* shift 3Bh into&nbsp; AH */
<BR>&nbsp;&nbsp; reg.r_dx = FP_OFF(directory);
<BR>&nbsp;&nbsp; reg.r_ds = FP_SEG(directory);
<BR>&nbsp;&nbsp; intr(0x21, &amp;reg);
<BR>&nbsp;&nbsp; if (reg.r_flags &amp; CF)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Directory change failed\n");
<BR>&nbsp;&nbsp; getcwd(directory, 80);
<BR>&nbsp;&nbsp; printf("The current directory is: %s\n", directory);
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: ioctl
<BR>功&nbsp; 能: 控制I/O设备
<BR>用&nbsp; 法: int ioctl(int handle, int cmd[,int *argdx, int argcx]);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;dir.h>
<BR>#include &lt;io.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int stat;

<P>&nbsp;&nbsp; /* use func 8 to determine if the default drive is removable
*/
<BR>&nbsp;&nbsp; stat = ioctl(0, 8, 0, 0);
<BR>&nbsp;&nbsp; if (!stat)
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Drive %c is removable.\n", getdisk()
+ 'A');
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Drive %c is not removable.\n",
getdisk() + 'A');
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: isatty
<BR>功&nbsp; 能: 检查设备类型
<BR>用&nbsp; 法: int isatty(int handle);
<BR>程序例:

<P>#include &lt;stdio.h>
<BR>#include &lt;io.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int handle;

<P>&nbsp;&nbsp; handle = fileno(stdprn);
<BR>&nbsp;&nbsp; if (isatty(handle))
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Handle %d is a device type\n",
handle);
<BR>&nbsp;&nbsp; else
<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; printf("Handle %d isn't a device type\n",
handle);
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;
<BR>&nbsp;
<BR>&nbsp;

<P>函数名: itoa
<BR>功&nbsp; 能: 把一整数转换为字符串
<BR>用&nbsp; 法: char *itoa(int value, char *string, int radix);
<BR>程序例:

<P>#include &lt;stdlib.h>
<BR>#include &lt;stdio.h>

<P>int main(void)
<BR>{
<BR>&nbsp;&nbsp; int number = 12345;
<BR>&nbsp;&nbsp; char string[25];

<P>&nbsp;&nbsp; itoa(number, string, 10);
<BR>&nbsp;&nbsp; printf("integer = %d string = %s\n", number, string);
<BR>&nbsp;&nbsp; return 0;
<BR>}
<BR>&nbsp;

<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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