请问一下C语言怎么实现长按按键执行某样操作啊，比如贪吃蛇长按方向键实现加速。

Question

while(1)

{

        LoadKeyboardLayout("0x409", KLF_ACTIVATE | KLF_SETFORPROCESS);  //切换为英文输入法

        char s1[10], s2[10];        //保存成绩

            settextcolor(GREEN);
        sprintf(s1, "玩家1分数：%d", score);   //将成绩格式化输出到字符串s1中 
        outtextxy(0, 0, s1);
        sprintf(s2, "玩家2分数：%d", score2);  //将成绩格式化输出到字符串s2中 
        outtextxy(0, 20, s2);

            outtextxy(1050,200,_T("按空格键暂停游戏，按p退出游戏！"));
     // 获取按键

        t2 = GetTickCount();

        if (kbhit())
        {
            c = getch();

            t2 = GetTickCount();
            t1=t2;

            if(c==' ') //按空格键游戏暂停
            {    
                outtextxy(520, 320, "游戏暂停，按回车键继续游戏");

                getchar();
                settextcolor(WHITE);
                outtextxy(520, 320, "游戏暂停，按回车键继续游戏");
            }
            if(c=='p') //按p退出游戏
            {  
                exit(0);
            }

            // 根据按键设置蛇的运动方向
            switch(c)
            {
                case 'a':   //向左，原方向为上下才可以变
                    if(snake->headDirection == 'w' || snake->headDirection == 's' )snake->headDirection = c ; break;
                case 'd':   //向右，原方向为上下才可以变
                    if(snake->headDirection == 'w' || snake->headDirection == 's' )snake->headDirection = c ; break;
                case 'w':   //向上，原来为左右才变化
                    if(snake->headDirection == 'a' || snake->headDirection == 'd' )snake->headDirection = c ; break;
                case 's':   //向下，原来为左右才变化
                    if(snake->headDirection == 'a' || snake->headDirection == 'd' )snake->headDirection = c ; break;
                case 75:   //向左，原方向为上下才可以变
                    if(snake2->headDirection == 'w' || snake2->headDirection == 's' )snake2->headDirection = 'a' ; break;
                case 77:   //向右，原方向为上下才可以变
                    if(snake2->headDirection == 'w' || snake2->headDirection == 's' )snake2->headDirection = 'd' ; break;
                case 72:   //向上，原来为左右才变化
                    if(snake2->headDirection == 'a' || snake2->headDirection == 'd' )snake2->headDirection = 'w' ; break;
                case 80:   //向下，原来为左右才变化
                    if(snake2->headDirection == 'a' || snake2->headDirection == 'd' )snake2->headDirection = 's' ; break;
            }
        }

        judge=moveSnake(snake,1,snake2);   //按照蛇的运动方向移动
        if(judge==5)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家1撞到了自己的身体，恭喜玩家2获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            break;
        }
        if(judge==6)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家2撞到了自己的身体，恭喜玩家1获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            break;
        }


        if(judge==0)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家1撞墙了，恭喜玩家2获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            score=0;
            score2=0;
            break;
        }
        else if(judge==2)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家1撞到了玩家2的身体，恭喜玩家2获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            score=0;
            score2=0;
            break;
        }
        judge=moveSnake(snake2,2,snake); 
        if(judge==0)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家2撞墙了，恭喜玩家1获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            score=0;
            score2=0;
            break;

        }
        else if(judge==2)
        {
            settextcolor(GREEN);
            outtextxy(455, 320, "玩家2撞到了玩家1的身体，恭喜玩家1获得了胜利，游戏结束！");
            outtextxy(455, 340, "按回车键继续游戏，按Esc键返回菜单选择模式！");
            score=0;
            score2=0;
            break;
         }

        // 延时
        Sleep(v-70);

        if(t2 - t1 > 50)
        {
            v=50;
            t1=t2;
        }
    } 

Answer 1

长按一般就是加上时间的判断，长按时间内都为同一个键值即判断为长按。注意要添加消抖。释放和按下都要做消抖。消抖时间一般几十毫秒。