Windows根据文件句柄获取文件名

句柄在Windows系统中有很重要的作用，窗口、文件、线程……都会产生一个句柄来告诉操作系统如何对对象进行操纵。那么一旦句柄拿到，那么就可以拿到更多信息。

BOOL GetFileNameFromHandleW(HANDLE hFile, LPWSTR lpFilePath) {
    const int ObjectNameInformation = 1;  // enum OBJECT_INFORMATION_CLASS;
    typedef LONG(CALLBACK* ZWQUERYOBJECT)(
            HANDLE ObjectHandle,
            ULONG  ObjectInformationClass,
            PVOID  ObjectInformation,
            ULONG  ObjectInformationLength,
            PULONG ReturnLength
    );
    lpFilePath[0] = 0x00;
    HMODULE hNtDLL = LoadLibraryW(L"ntdll.dll");
    if (hNtDLL == 0x00)
    {
        return FALSE;
    }

    ZWQUERYOBJECT ZwQueryObject = (ZWQUERYOBJECT)GetProcAddress(hNtDLL,  "ZwQueryObject");
    if (ZwQueryObject == 0x00)
    {
        return FALSE;
    }

    WCHAR  szPathInfo[MAX_PATH + 4];
    WCHAR  szDrive[MAX_PATH];
    WCHAR *lpDrive = szDrive;
    ULONG  dwResult;
    int    iPathLen;
    if (ZwQueryObject(hFile, ObjectNameInformation, szPathInfo, sizeof(szPathInfo)  - 1, &dwResult) != 0)
    {
        return FALSE;
    }

    // if the file on net drive
    const PWCHAR szNetDevice = L"//Device//LanmanRedirector";
    if (!wcsnicmp(szPathInfo + 4, szNetDevice, lstrlenW(szNetDevice)))
    {
        lstrcpyW(lpFilePath, L"//");
        lstrcatW(lpFilePath, szPathInfo + 4 + lstrlenW(szNetDevice));
        return TRUE;
    }

    if (GetLogicalDriveStringsW(MAX_PATH - 1, szDrive) >= MAX_PATH)
    {
        return FALSE;
    }
    while ((iPathLen = lstrlenW(lpDrive)) != 0)
    {
        WCHAR szDevName[MAX_PATH];
        lpDrive[iPathLen - 1] = 0x00;
        int iDevLen = (int)QueryDosDeviceW(lpDrive, szDevName, MAX_PATH);
        if (iDevLen && iDevLen < MAX_PATH)
        {
            iDevLen = lstrlenW(szDevName);
            if (!wcsnicmp(szPathInfo + 4, szDevName, iDevLen))
            {
                lstrcpyW(lpFilePath, lpDrive);
                lstrcatW(lpFilePath, szPathInfo + 4 + iDevLen);
                break;
            }
        }
        lpDrive += iPathLen + 1;
    }
    return TRUE;
}