boost将当前时间写入共享内存

 

    首先是要开辟电脑上的共享空间，利用boost的share_memory_object很容易实现

接着获取当前时间，由于获得的位UTC时间，北京时间还需要加8小时，最后写入内存。

#include "stdafx.h"
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/date_time/gregorian/gregorian.hpp> 
#include <boost/date_time/posix_time/posix_time.hpp> 
#include <boost/thread.hpp>
int _tmain(int argc, _TCHAR* argv[])
{
    while (true)
    {    
        //开辟共享空间
        boost::this_thread::sleep(boost::posix_time::minutes(3));
        boost::interprocess::shared_memory_object sharedMem(boost::interprocess::open_or_create,"Test",boost::interprocess::read_write);
        sharedMem.truncate(14);
        boost::interprocess::mapped_region mapRegion(sharedMem,boost::interprocess::read_write);

        boost::posix_time::hours hourDure(8);    
        boost::posix_time::ptime pt = boost::posix_time::second_clock::universal_time();
        boost::posix_time::ptime ptNow = pt + hourDure;

        //转换为YYYYMMDDHHMMSS格式，占14个字符
        std::string strTime = boost::posix_time::to_iso_string(ptNow);
        int ipos = strTime.find('T');
        strTime.erase(ipos,1);
        
        memcpy(mapRegion.get_address(),strTime.c_str(),14);
        const char* tchar = static_cast<char*>(mapRegion.get_address());
        std::cout<< tchar<<std::endl;
        std::cout<< mapRegion.get_address()<<std::endl;
    }
    
    return 0;
}