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<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312"> <META NAME="Author" CONTENT="wdg"> <META NAME="GENERATOR" CONTENT="Mozilla/4.03 [en] (Win95; I) [Netscape]"> <TITLE>fo</TITLE></HEAD><BODY> <P>函数名: open<BR>功 能: 打开一个文件用于读或写<BR>用 法: int open(char *pathname, int access[, int permiss]);<BR>程序例:<P>#include <string.h><BR>#include <stdio.h><BR>#include <fcntl.h><BR>#include <io.h><P>int main(void)<BR>{<BR> int handle;<BR> char msg[] = "Hello world";<P> if ((handle = open("TEST.$$$", O_CREAT | O_TEXT)) == -1)<BR> {<BR> perror("Error:");<BR> return 1;<BR> }<BR> write(handle, msg, strlen(msg));<BR> close(handle);<BR> return 0;<BR>}<BR> <BR> <P>函数名: outport<BR>功 能: 输出整数到硬件端口中<BR>用 法: void outport(int port, int value);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> int value = 64;<BR> int port = 0;<P> outportb(port, value);<BR> printf("Value %d sent to port number %d\n", value, port);<BR> return 0;<BR>}<BR> <BR> <P>函数名: outportb<BR>功 能: 输出字节到硬件端口中<BR>用 法: void outportb(int port, char byte);<BR>程序例:<P>#include <stdio.h><BR>#include <dos.h><P>int main(void)<BR>{<BR> int value = 64;<BR> int port = 0;<P> outportb(port, value);<BR> printf("Value %d sent to port number %d\n", value, port);<BR> return 0;<BR>}<BR> <BR> <P>函数名: outtext<BR>功 能: 在视区显示一个字符串<BR>用 法: void far outtext(char far *textstring);<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 midx, midy;<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 errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* move the C.P. to the center of the screen */<BR> moveto(midx, midy);<P> /* output text starting at the C.P. */<BR> outtext("This ");<BR> outtext("is ");<BR> outtext("a ");<BR> outtext("test.");<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <BR> <P>函数名: outtextxy<BR>功 能: 在指定位置显示一字符串<BR>用 法: void far outtextxy(int x, int y, char *textstring);<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 midx, midy;<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 errorcode */<BR> }<P> midx = getmaxx() / 2;<BR> midy = getmaxy() / 2;<P> /* output text at the center of the screen*/<BR> /* Note: the C.P. doesn't get changed.*/<BR> outtextxy(midx, midy, "This is a test.");<P> /* clean up */<BR> getch();<BR> closegraph();<BR> return 0;<BR>}<BR> <P> <A HREF="index.html">返回目录</A><BR></BODY></HTML>⌨️ 快捷键说明
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