Winapi GetFileSecurity始终返回找不到的文件

从VBA调用GetFileSecurity总是返回“未找到文件”，即使可以使用CreateFileW获得文件句柄。下面的例子

  sUnicode = MakeUnicode(szfilename)
    Debug.Print sUnicode
    bSuccess = GetFileSecurityW(StrPtr(MakeUnicode(szfilename)), OWNER_SECURITY_INFORMATION, 0, 0&, _
                                sizeSD)
    Debug.Print ErrorMsg(Err.LastDllError)


    Const GENERIC_READ As Long = &H80000000
    Const OPEN_EXISTING = &H3
    Const FILE_SHARE_READ = &H1
    Const FILE_ATTRIBUTE_ARCHIVE As Long = &H20
    Const FILE_ATTRIBUTE_HIDDEN As Long = &H2
    Const FILE_ATTRIBUTE_READONLY As Long = &H1
    Const FILE_ATTRIBUTE_SYSTEM As Long = &H4
    Const FILE_ATTRIBUTE_NORMAL = &H80&

    Dim Flags As Long, Access As Long
    Dim Disposition As Long, Share As Long

    Access = GENERIC_READ
    Share = FILE_SHARE_READ
    Disposition = OPEN_EXISTING
    Flags = FILE_ATTRIBUTE_ARCHIVE Or FILE_ATTRIBUTE_HIDDEN Or FILE_ATTRIBUTE_NORMAL _
            Or FILE_ATTRIBUTE_READONLY Or FILE_ATTRIBUTE_SYSTEM

    Debug.Print CreateFileW(StrPtr(sUnicode), Access, Share, ByVal 0&, Disposition, Flags, 0&)

UNC文件路径的调试输出无效

\\?\UNC\kazw029530\Test Long File Folder Name\DAFF004 - ICON\201104 DAFF004 ICON SR3    LOMP3P WBS FGOV-5100035-01-10 110506 LOMP003P RiskAnalysis vA1 4.xls
The system cannot find the file specified.

4448

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不幸的是，并非所有Windows API函数都支持

\\？\

前缀。CreateFileW有，GetFileSecurity没有。文档指定函数是否支持它

因此，必须使用不带前缀的文件名，这将其长度限制为

MAX\u PATH

个字符