使用内存映射文件来共享数据

// ProcessTransCreateFileMap.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <tchar.h>
using namespace std;

#define MAX_SIZE_SHARE 1024
int _tmain(int argc, _TCHAR* argv[])
{
    HANDLE hFileMap = ::CreateFileMapping(INVALID_HANDLE_VALUE,NULL,PAGE_READWRITE,0,MAX_SIZE_SHARE,TEXT("TestFileMap"));
    if(hFileMap != NULL)
    {
        if(::GetLastError() == ERROR_ALREADY_EXISTS)
        {
            PBYTE pView = (PBYTE)MapViewOfFile(hFileMap,FILE_MAP_READ | FILE_MAP_WRITE,0,0,0);
            if(pView != NULL)
            {
                TCHAR szBuf[1024] = {0};
                _tcscpy_s(szBuf,1024,(TCHAR * )pView);
                wcout<<L"the other process data is :"<<szBuf <<endl;
                UnmapViewOfFile(pView);
            }
            else
            {
                wcout<<L"map failed!"<<endl;
            }
            ::CloseHandle(hFileMap);
        }
        else
        {
            PBYTE pView = (PBYTE)MapViewOfFile(hFileMap,FILE_MAP_READ | FILE_MAP_WRITE,0,0,0);
            if(pView != NULL)
            {
                TCHAR szBuf[] = {TEXT("this is a demo!!!!")};
                ZeroMemory(pView,MAX_SIZE_SHARE);
                CopyMemory(pView,szBuf,(_tcslen(szBuf) + 1) * sizeof(TCHAR));
                cout<<"already write a data "<<endl;
                UnmapViewOfFile(pView);
            }
            else
                wcout<<L"map failed!"<<endl;
        }
    }
    system("pause");
    return 0;
}