文件属性值 [英] File Attribute Values

问题描述

我正在尝试使用System.IO.File.GetAttributes(filename)了解返回的值
如果我获取显示在资源管理器中的随机文件，则选中的框为只读& ;；文件准备存档
如果枚举的结果是

C:\ Users \ Public \ Wireshark IP Map a01688 \ ipmap.html的文件属性为:
8
2
2
5

取消选中这2个框，以便不选中任何一个，我又回来了，
C:\ Users \ Public \ Wireshark IP Map a01688 \ ipmap.html的文件属性为:
8
1
9
2

该文件的副本，仅带有加密的已检查退货，
C:\ Users \ Public \ Wireshark IP Map a01688 \ ipmap的文件属性-Encrypted.html是:
2
4
5
7
6

加密后的同一副本，文件可供存档，为该文件编制索引以加快搜索速度.返回.
C:\ Users \ Public \ Wireshark IP Map a01688 \ ipmap的文件属性-Encrypted.html是:
1
6
4
1
6

我找不到任何挑衅性的说法，这就是这个数字的意思.

我尝试使用case语句并在此处使用值
http://msdn.microsoft.com/zh-CN /library/system.io.fileattributes(v=vs.90).aspx [ 无论哪种方式，如果我从0或1开始索引都没有意义.

重新使用的内容也似乎与该页面上定义的内容不符.
http://msdn.microsoft.com/zh-CN /library/windows/desktop/gg258117(v=vs.85).aspx [

I''m trying to understand the returned values using System.IO.File.GetAttributes(filename)
If I take a random file that shows in explorer the Boxes Checked are Read only & File Ready For Archiving
The Result If you enumerate are

File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap.html Are :
8
2
2
5

Unchecking those 2 boxes so None are checked I get back,
File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap.html Are :
8
1
9
2

A copy of the file with only encrypted checked returns,
File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap - Encrypted.html Are :
2
4
5
7
6

Same Copy With encrypted,File ready for archiving ,index this file for faster searching. returns.
File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap - Encrypted.html Are :
1
6
4
1
6

I can not find anything that defiantly says this is what this number means.

I tried using a case statement and using the Values here
http://msdn.microsoft.com/en-us/library/system.io.fileattributes(v=vs.90).aspx[^]
I assumed that it would start at 1 and go from there, but during a test of several files it returned a value of "0".
Either way if I start index at 0 or 1 results don''t make sense.

The reuslts also do not appear to match up to what is defined on this page.
http://msdn.microsoft.com/en-us/library/windows/desktop/gg258117(v=vs.85).aspx[^]

Would someone please point me in the right direction.
Thank you for any help.

Code used to produce the results:

Imports System
Imports System.IO
Imports System.Security.AccessControl
Imports System.Text

   Private Sub btnGetFileAttributes_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetFileAttributes.Click
        Dim filename As String = Nothing
        Try

            Dim strBuilder As New StringBuilder

            Dim Attributes As String = System.IO.File.GetAttributes(filename)

            For Each atb In Attributes

                strBuilder.AppendLine(atb)
            Next

            Dim OutputString As String
            OutputString = ("File Attributes for " & filename & " Are :" & vbNewLine & strBuilder.ToString)
            TextBox1.Text = OutputString
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub

推荐答案

您需要查看System.IO.FileAttributes的定义以了解这一简单内容.他们提供了一个位集:

You need to see at the definition of the System.IO.FileAttributes to understand this simple thing. They present a bitset:

ReadOnly = 1,<br />
Hidden = 2,<br />
System = 4,<br />
Directory = 16

...

要将属性添加到位集中，您需要使用二进制Or操作.要检查是否设置了属性，您需要执行二进制And并将结果与​​0比较(这意味着该位是清除的).

有关按位运算，请参见:
http://msdn.microsoft.com/en-us/library/wz3k228a％28v = vs.80％29.aspx [ ^ ].

另请参见: http://en.wikipedia.org/wiki/Bitset [

…

To add an attribute to a bitset, you need to use binary Or operation. To check if an attribute is set, you need to perform binary And and compare the result with 0 (which means the bit is clear).

For bitwise operations, please see:
http://msdn.microsoft.com/en-us/library/wz3k228a%28v=vs.80%29.aspx[^].

See also: http://en.wikipedia.org/wiki/Bitset[^].

—SA

这里是我现在所拥有的:

Here Is what I have now:

Private Sub btnGetFileAttributes_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGetFileAttributes.Click
        'Attribute Info From http://msdn.microsoft.com/en-us/library/system.io.fileattributes(v=vs.90).aspx

        TextBox1.Clear()
        Dim filename As String = Nothing
        Try


            If UseFileBorowser = True Then
                filename = FN
                If filename = Nothing Then
                    MsgBox("No File Was Chosen")
                    Exit Sub
                End If
            ElseIf UseFileBorowser = False Then
                filename = TextBox2.Text
                If filename = Nothing Then
                    MsgBox("No File Path Was Entered")
                    Exit Sub
                End If
            End If

            'Dim flatb As FileAttribute
            Dim strBuilder As New StringBuilder

            filename = OpenFileDialog1.FileName

            Dim FileAtri As FileAttribute   '.ToString

            For idx = 0 To 65536
                FileAtri = idx

                If idx <> System.IO.File.GetAttributes(filename) = False Then

                    'strBuilder.AppendFormat("{0,3} - {1}", idx, CType(Val(FileAtri), FlagAttr).ToString())
                    strBuilder.AppendLine()
                    strBuilder.AppendLine(CType(Val(FileAtri), FlagAttr).ToString() & vbNewLine)


                End If
            Next


            Dim OutputString As String
            OutputString = ("File Attributes for " & filename & " Are :" & vbNewLine & strBuilder.ToString)
            'OutputString = (Attributes.ToString)

            TextBox1.Text = OutputString
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try


    End Sub

    <flagsattribute()> _
    Enum FlagAttr As Integer
        FILE_ATTRIBUTE_ARCHIVE = 32
        FILE_ATTRIBUTE_COMPRESSED = 2048
        FILE_ATTRIBUTE_DEVICE = 64
        FILE_ATTRIBUTE_DIRECTORY = 16
        FILE_ATTRIBUTE_ENCRYPTED = 16384
        FILE_ATTRIBUTE_HIDDEN = 2
        FILE_ATTRIBUTE_NORMAL = 128
        FILE_ATTRIBUTE_NOT_CONTENT_INDEXED = 8192
        FILE_ATTRIBUTE_OFFLINE = 4096
        FILE_ATTRIBUTE_READONLY = 1
        FILE_ATTRIBUTE_REPARSE_POINT = 1024
        FILE_ATTRIBUTE_SPARSE_FILE = 512
        FILE_ATTRIBUTE_SYSTEM = 4
        FILE_ATTRIBUTE_TEMPORARY = 256
        FILE_ATTRIBUTE_VIRTUAL = 65536
    End Enum

File with just Read only Checked
File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap.html Are :

FILE_ATTRIBUTE_READONLY, FILE_ATTRIBUTE_NOT_CONTENT_INDEXED

File With Just Encrypted Checked"
File Attributes for C:\Users\Public\Wireshark IP Map a01688\ipmap - Encrypted.html Are :

FILE_ATTRIBUTE_NOT_CONTENT_INDEXED, FILE_ATTRIBUTE_ENCRYPTED

Stil无法完全按照我的意愿输出，但似乎返回正确的值.

Stil Does not ouput exactly the way I would Like but Appears to return the Correct Values.

这篇关于文件属性值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！