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
            0,                       // 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).
"),
        GetLastError());
        return 0;
    }
    pBuf = (LPTSTR) MapViewOfFile(hMapFile,   // handle to map object
            FILE_MAP_ALL_ACCESS, // read/write permission
            0,
            0,
            BUF_SIZE);

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

        CloseHandle(hMapFile);

        return 0;
    }

    memcpy((PVOID)pBuf, str, BUF_SIZE);
    return 1;
}

LPCTSTR GetBuffer()
{
    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)
            szName);                 // name of mapping object

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

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

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