获得键盘方向键VC++

#include <conio.h>#include <iostream>int GetDirection(){    int ret = 0;    do     {        int ch = _getch();        if(isascii(ch))             continue; //这里必须要两次，非ascii的第一次输入是 虚拟码（224），第二次输入才是        ch = _getch();        switch(ch)        {        case 72:                ret = 2; // top            break;        case 75:                ret = 1; // left             break;        case 77:                ret = 3; // right            break;        case 80:                ret = 4; // down            break;        default:                break;        }    } while (ret == 0);    return ret;}int main(int argc, char* argv[]){    for(int k = 0; k < 10; k++)        std::cout<<GetDirection();    system("pause");    return 0;}

conio.h 不是ISO c 和 POSIX的标准， Console Input/Output 简写。windows linux均可用。
包含的接口有：

cgets(char*);cputs(constchar*);cscanf(constchar*,...);inpw(unsignedshort);getch(void);getche(void);kbhit(void);//键盘响应，是否被按下。outp(unsignedshort,int);outpw(unsignedshort,unsignedshort);putch(int);ungetch(int);void_Cdeclclreol(void);void_Cdeclclrscr(void);void_Cdecldelline(void);int_Cdeclgettext(intleft,inttop,intright,intbottom,void*destin);void_Cdeclgettextinfo(structtext_info*r);void_Cdeclgotoxy(intx,inty);void_Cdeclhighvideo(void);void_Cdeclinsline(void);void_Cdecllowvideo(void);int_Cdeclmovetext(intleft,inttop,intright,intbottom,intdestleft,intdesttop);void_Cdeclnormvideo(void);int_Cdeclputtext(intleft,inttop,intright,intbottom,void*source);void_Cdecltextattr(intnewattr);void_Cdecltextbackground(intnewcolor);void_Cdecltextcolor(intnewcolor);void_Cdecltextmode(intnewmode);int_Cdeclwherex(void);int_Cdeclwherey(void);void_Cdeclwindow(intleft,inttop,intright,intbottom);char*_Cdeclcgets(char*str);int_Cdeclcprintf(constchar*format,...);int_Cdeclcputs(constchar*str);int_Cdeclcscanf(constchar*format,...);int_Cdeclgetch(void);int_Cdeclgetche(void);char*_Cdeclgetpass(constchar*prompt);int_Cdeclkbhit(void);int_Cdeclputch(intc);int_Cdeclungetch(intch);