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【可复用性程序设计】——事件触发

2024-07-17 04:46:00   214人阅读

先定义一个最简化的事件数据结构

typedef struct{

    unsigned char event_flg;
    unsigned char event_cnt_buf[event_flg_wide];
    void (*pEventCallback[event_flg_wide])(void);
}event;
如果你的事件比较复杂，你可以继续往数据结构里添加对象成员，但是我不会这么干，我会抽象出一个事件类，然后通过继承派生出更丰富的子类。

事件触发具体实现如下：
event.cpp
#include <iostream>#include "event.h"using namespace std;event msg_event;void msg_event_init(void){}//注册消息响应函数void event_install_callback(unsigned char fn_index, void pfn(void)){  if(fn_index < event_flg_wide)  {    msg_event.pEventCallback[fn_index] = pfn;  }}//卸载消息响应函数void event_uninstall_callback(unsigned char fn_index){  if(fn_index < event_flg_wide)  {    msg_event.pEventCallback[fn_index] = NULL;  }}void close_all_msg(event event_t ){    unsigned char i = 0;    event_t.event_flg = 0;    for(i=0;i<event_flg_wide;i++)        event_t.event_cnt_buf[i] = 0;    for(i=0;i<event_flg_wide;i++)        event_t.pEventCallback[i] = NULL;}void msg_event_rountine(void){    cout << "msg_event_rountine!" << endl;}//消息事件主线程void msg_event_main_thread(void){    unsigned char i;    //监测到事件消息    if(msg_event.event_flg)    {        //累计消息条目        for(i=0;i<event_flg_wide;i++)        {            if(msg_event.event_flg&(1<<i))            {                msg_event.event_flg &= (~(1<<i));                msg_event.event_cnt_buf[i]++;            }        }    }    else    {        //关掉负载    }    //执行消息响应    for(i=0;i<event_flg_wide;i++)    {        if(msg_event.event_cnt_buf[i])        {            if(msg_event.pEventCallback != NULL)            {                msg_event.pEventCallback[i]();                msg_event.event_cnt_buf[i]--;                break;            }        }    }}
头文件event.h
#ifndef EVENT_H#define EVENT_H#ifndef FALSE  #define  FALSE  0x00u#endif#ifndef TRUE  #define  TRUE   0x01u#endif#ifndef NULL  #define  NULL   0x00u#endif#define event_flg_wide  8typedef struct{    unsigned char event_flg;    unsigned char event_cnt_buf[event_flg_wide];    void (*pEventCallback[event_flg_wide])(void);}event;extern event msg_event;void msg_event_init(void);void msg_event_main_thread(void);void event_install_callback(unsigned char fn_index, void pfn(void));void event_uninstall_callback(unsigned char fn_index);void msg_event_rountine(void);void close_all_msg(event event_t );#endif // EVENT_H
 
在main函数中注册两个事件，触发一下试试
    　　msg_event_init();
    event_install_callback(0,msg_event_rountine);
    event_install_callback(1,msg_event_rountine);
    msg_event.event_flg |= (1<<0)|(1<<1);
    while(1){
    msg_event_main_thread();
    }
 
测试工程放在网盘http://pan.baidu.com/s/1gdy2dhT






























        

            
                
                  
                
                

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