C++ processes share data encapsulated as class instances

This article illustrates the C++ process Shared data encapsulation into a class method, sharing for your reference. Specific methods are as follows:

The source file for ShareMemory. CPP is as follows:

#include "ShareMemory.h"  

  

CShareMemory::CShareMemory(const    char* pszMapName, int nFileSize, BOOL bServer):m_hFileMap(NULL),m_pBuffer(NULL)  

{  

    if (bServer) //Is the server, created & NBSP; < br / >
    {  

        m_hFileMap = ::CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_EXECUTE_READWRITE, 0, nFileSize, pszMapName);  

    }  

    else //Otherwise open & NBSP; < br / >
    {  

        m_hFileMap = ::OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, pszMapName);  

    }  

    //Map it to memory & NBSP; < br / >
    m_pBuffer = ::MapViewOfFile(m_hFileMap, FILE_MAP_ALL_ACCESS, 0, 0, 0);  

}  

  

CShareMemory::~CShareMemory(void)  

{  

    ::UnmapViewOfFile(m_pBuffer);  

    ::CloseHandle(m_hFileMap);  

}

The ShareMemory. H header file is as follows:

#pragma once  

#include <Windows.h>  

  

class CShareMemory  

{  

public:  

    CShareMemory(const  char* pszMapName, int nFileSize=0, BOOL bServer=FALSE);  

    ~CShareMemory(void);  

    //Property & have spent < br / >
    LPVOID GetBuffer() const   

    {  

        return m_pBuffer;  

    }  

  

    //Implement & have spent < br / >
private:  

    HANDLE m_hFileMap;  

    LPVOID m_pBuffer;  

};

The usage is as follows:

Server:

#include "ShareMemory.h"  

int main(int argc, char *argv[])  

{  

  

    //Memory sharing between processes & NBSP; < br / >
    LPCTSTR lpName= "hello";  

    LPCTSTR lpContent = "123456";  

    CShareMemory* pShareMemory = new CShareMemory(lpName, 20, FALSE);  

    LPVOID lpBase = pShareMemory->GetBuffer();  

    strcpy((char*)lpBase, lpContent);  

      

    printf("%sn",(char*)pShareMemory->GetBuffer());  

    getchar();  

    return 0;  

}

Client:

#include "ShareMemory.h"  

int main(int argc, char *argv[])  

{  

  

    //Memory sharing between processes & NBSP; < br / >
    LPCTSTR lpName= "hello";  

    LPCTSTR lpContent = "123456";  

    CShareMemory* pShareMemory = new CShareMemory(lpName, 20, FALSE);  

  

    printf("%sn",(char*)pShareMemory->GetBuffer());  

    getchar();  

    return 0;  

}

Hope that the article described in the C++ programming to help you.