Отображение файла в памяти, используя WinApi

 CHAR stdPath[30] = TEXT("Res.txt");
    HANDLE hFile = CreateFile(stdPath, FILE_SHARE_WRITE | FILE_SHARE_READ, 0, nullptr, CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL, nullptr);
    std::string buf = "";
    int i = 0;
    std::ostringstream s;
    while (i < currentIndex) {
        s << "X = " << pointsX[i] << "          Y = " << pointsY[i] << "\n";
        i++;
    }
    buf.append(s.str());;
    DWORD length = buf.size();
    WriteFile(hFile, buf.c_str(), length , 0, 0);
    DWORD FileSize = GetFileSize(hFile, nullptr);
 
    HANDLE hMapping = CreateFileMapping(hFile, nullptr, PAGE_READONLY,0, 0, nullptr);
    if (hMapping == nullptr) {
        printf("\n--------------------------------------------------------\n");
        printf("%d",GetLastError());
        printf("\n--------------------------------------------------------\n");
        return 0;
    }
    const char* dataPtr = (const char*)MapViewOfFile(hMapping,FILE_MAP_READ,0,0,length);
    return 0;

HANDLE hMapFile;
    LPCTSTR pBuf;
    TCHAR szName[] = TEXT("Res.txt");
    hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS,FALSE,szName);
    pBuf = (LPTSTR)MapViewOfFile(hMapFile,FILE_MAP_ALL_ACCESS,0,0,BUF_SIZE);
    MessageBox(NULL, pBuf, TEXT("Process2"), MB_OK);
    UnmapViewOfFile(pBuf);
    CloseHandle(hMapFile);
    return 0;

CreateFileMapping(................, "Global\\MyFileMappingObject");
 
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OpenFileMapping(................, "Global\\MyFileMappingObject");