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  • how to get keyboard key with non blocking in terminal

    /**************************************************************************
     *        how to get keyboard key with non blocking in terminal
     * 声明:
     *      如何在终端下以非堵塞的方式获取按键的键值,这个想法最初是因为
     *  在单线程下实现多任务,同时不因键盘输入而堵塞,核心内容来自网络,
     *  但已经忘了出处。
     * 
     *                                    2015-7-5 晴 深圳 南山平山村 曾剑锋
     *************************************************************************/
    
                        \\\-*- 目录 -*-/////
                        |  一、cat kbhit.h
                        |  二、cat kbhit.c
                        \\\\\\///////////
    
    一、cat kbhit.h
        #ifndef __KBHIT_H__
            #define __KBHIT_H__
        
            #include <stdio.h>
            #include <termios.h>
            /**
             * 初始化键盘操作
             */
            void init_keyboard(void);
            /**
             * 关闭键盘操作
             */
            void close_keyboard(void);
            /**
             * 判断是否有按键按下,如果有案件按下返回1,没有按键按下
             * 则返回0
             */
            int kbhit(void);
            /**
             * 用于在有案件按下之后,读取字符
             */
            int readch(void);
        
        #endif // __KBHIT_H__
    
    二、cat kbhit.c
        #include "kbhit.h"
        
        static struct termios initial_settings, new_settings;
        static int peek_character = -1;
        
        void init_keyboard()
        {
            tcgetattr(0,&initial_settings);
            new_settings = initial_settings;
            new_settings.c_lflag &= ~ICANON;
            new_settings.c_lflag &= ~ECHO;
            new_settings.c_lflag &= ISIG;
            new_settings.c_cc[VMIN] = 1;
            new_settings.c_cc[VTIME] = 0;
            tcsetattr(0, TCSANOW, &new_settings);
        }
        
        void close_keyboard()
        {
            tcsetattr(0, TCSANOW, &initial_settings);
        }
        
        int kbhit()
        {
            unsigned char ch;
            int nread;
        
            if (peek_character != -1) return 1;
            new_settings.c_cc[VMIN]=0;
            tcsetattr(0, TCSANOW, &new_settings);
            nread = read(0,&ch,1);
            new_settings.c_cc[VMIN]=1;
            tcsetattr(0, TCSANOW, &new_settings);
            if(nread == 1)
            {
                peek_character = ch;
                return 1;
            }
            return 0;
        }
        
        int readch()
        {
            char ch;
        
            if(peek_character != -1)
            {
                ch = peek_character;
                peek_character = -1;
                return ch;
            }
            read(0,&ch,1);
            return ch;
        }
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  • 原文地址:https://www.cnblogs.com/zengjfgit/p/4622196.html
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