GetFileSecurityW始終返回文件未找到

Question

即使可以使用CreateFileW獲取文件句柄，從VBA調用GetFileSecurityW始終會返回「文件未找到」。下面從一個UNC文件路徑輸出

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&) 

調試的例子是

\\?\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 

Answer 1

不幸的是，並非所有的Windows API函數支持\\?\前綴。 CreateFileW，GetFileSecurityW不。該文檔指定了一個功能是否支持它。

因此，您必須使用沒有此前綴的文件名，這會將其長度限制爲MAX_PATH個字符。