两个进程之间的命名共享内存

我正在尝试使用文件映射在C中构建客户端/服务器，但它仍处于开发初期，但在理解文件映射的工作原理时遇到了一些麻烦。

我在服务器上创建了一个结构的文件映射，并在上面放置了一些数据，然后我的客户端打开了文件映射，并读取了数据。然后，我的客户端将数据写入服务器以供读取，但服务器无法读取客户端数据，我也无法理解为什么，因为文件映射应该在两个进程之间进行同步。我现阶段仍未使用事件，但我认为它们不是工作所需的（是吗？）

她是我所拥有的代码。

服务器：

struct _HBACKUPSERVICE{
    DWORD           dwServerProcessID;
    TCHAR           szWork[MAX_PATH];
    HANDLE          hMapFile;
};

PHBACKUPSERVICE pBuf = NULL;
HANDLE hMapFile;

hMapFile = CreateFileMapping(
    INVALID_HANDLE_VALUE,    // use paging file
    NULL,                    // default security
    PAGE_READWRITE,          // read/write access
    0,                       // maximum object size (high-order DWORD)
    sizeof(HBACKUPSERVICE),  // maximum object size (low-order DWORD)
    _T("MyService"));        // name of mapping object

if (/*phBackupService->*/hMapFile == NULL){
    _tprintf(TEXT("Could not create file mapping object (%d).\n"),
        GetLastError());
    return *pBuf;
}

pBuf = (PHBACKUPSERVICE)MapViewOfFile(
    hMapFile,               // handle to map object
    FILE_MAP_ALL_ACCESS,    // read/write permission
    0,
    0,
    sizeof(HBACKUPSERVICE));

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


// Populate backup service structure
pBuf->hMapFile = hMapFile;
pBuf->dwServerProcessID = GetCurrentProcessId();

// Wait for client
do{
    _tprintf(_T("\nServer: Waiting for work."));
    pBuf = (PHBACKUPSERVICE)MapViewOfFile(
        _BackupService.hMapFile,    // handle to map object
        FILE_MAP_ALL_ACCESS,        // read/write permission
        0,
        0,
        sizeof(HBACKUPSERVICE));
    if (StringCbLength(pBuf->szWork, 1 * sizeof(TCHAR), NULL) == S_OK){ Sleep(500); }
} while (StringCbLength(pBuf->szWork, 1 * sizeof(TCHAR), NULL) == S_OK); // ERROR: pBuf->szWork is always empty...

_tprintf(_T("Work from client: %s"), pBuf->szWork);

客户：

HBACKUPSERVICE _BackupService;
HANDLE hMapFile;

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

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

BackupService= (PHBACKUPSERVICE)MapViewOfFile(
    hMapFile,               // handle to map object
    FILE_MAP_ALL_ACCESS,    // read/write permission
    0,
    0,
    sizeof(HBACKUPSERVICE));

_tprintf(_T("Server process id: %d"), _BackupService.dwServerProcessID);
_tprintf(_T("send work to server"));
StringCchCopy(_BackupService.szWork, STRSAFE_MAX_CCH, _T("Do work for me!!!!!!!!!!")); //ERROR: the server never sees this

谢谢！