C++基础--共享内存

// Writer.cpp
#include"stdafx.h"
#include <windows.h>
#include <conio.h>

#define BUF_SIZE 256
wchar_t szName[30]=TEXT("Global\\MyFileMappingObject");
wchar_t szMsg[30]=TEXT("Message from first process.");
wchar_t chr[100]; 
int _tmain()
{
   HANDLE hMapFile;
   LPCTSTR pBuf;

   hMapFile = CreateFileMapping(
                 INVALID_HANDLE_VALUE,    // use paging file
                 NULL,                    // default security
                 PAGE_READWRITE,          // read/write access
                 0,                       // maximum object size (high-order DWORD)
                 BUF_SIZE,                // maximum object size (low-order DWORD)
                 (LPCTSTR)szName);                 // name of mapping object

   if (hMapFile == NULL)
   {
      _tprintf(TEXT("Could not create file mapping object (%d).\n"),
             GetLastError());
      return 1;
   }
   pBuf = (LPTSTR) MapViewOfFile(hMapFile,   // handle to map object
                        FILE_MAP_WRITE, // read/write permission
                        0,
                        0,
                        BUF_SIZE);

   if (pBuf == NULL)
   {
      _tprintf(TEXT("Could not map view of file (%d).\n"),
             GetLastError());

       CloseHandle(hMapFile);

      return 1;
   }

   printf("input transform data:");
   scanf("%s",szMsg);
   //_tscanf("%s",szMsg);
   CopyMemory((PVOID)pBuf, szMsg, (wcslen(szMsg) * sizeof(wchar_t)));
   //scanf("%s"df
    _getch();

   UnmapViewOfFile(pBuf);

   CloseHandle(hMapFile);
    _tprintf(TEXT("success"));
    //system("pause");
    //_getch();
   return 0;
}

//Reader.cpp
//

#include "stdafx.h"
#include <windows.h>
#include <stdio.h>
#include <conio.h>
#include <tchar.h>
#include<cstdlib>
#pragma comment(lib, "user32.lib")

#define BUF_SIZE 256
wchar_t szName[]=TEXT("Global\\MyFileMappingObject");

int _tmain()
{
   HANDLE hMapFile;
   LPCTSTR pBuf;

   hMapFile = OpenFileMapping(
                   FILE_MAP_ALL_ACCESS,   // read/write access
                   FALSE,                 // do not inherit the name
                   (LPCTSTR)szName);               // name of mapping object

   if (hMapFile == NULL)
   {
      _tprintf(TEXT("Could not open file mapping object (%d).\n"),GetLastError());
      
      return 1;
   }

   pBuf = (LPTSTR) MapViewOfFile(hMapFile, // handle to map object
               FILE_MAP_READ,  // read/write permission
               0,
               0,
               BUF_SIZE);

   if (pBuf == NULL)
   {
      _tprintf(TEXT("Could not map view of file (%d).\n"),GetLastError());
      CloseHandle(hMapFile);

      return 1;
   }
   printf("%s\n",pBuf);

   system("pause");

   UnmapViewOfFile(pBuf);

   CloseHandle(hMapFile);

   return 0;
}