c++共享内存（转载）

对于连个不同的进程之间的通信，共享内存是一种比较好的方式，一个进程把数据发送到共享内存中，

另一个进程可以读取改数据，简单记录一下代码

 #define BUF_SIZE 256
 TCHAR szName[]=TEXT("Global\\YourFileMappingObject");    //指向同一块共享内存的名字

 int SetFileName(LPCTSTR str)
 {
     HANDLE hMapFile;
     LPCTSTR pBuf;

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

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

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

         CloseHandle(hMapFile);

         return ;
     }

     memcpy((PVOID)pBuf, str, BUF_SIZE);
     return ;
 }

 LPCTSTR GetBuffer()
 {
     HANDLE hMapFile;
     LPCTSTR pBuf;

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

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

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

         CloseHandle(hMapFile);
         return NULL;
     }
     return pBuf;
 }