如何在VB.net中引用当前Windows用户的视频文件夹路径

时间:2015-12-10 00:05:31

标签: vb.net windows environment-variables openfiledialog

我正在寻找一种方法来引用当前用户" MyVideos" VB.NET中的文件夹。

我的目标是使用此引用来设置InitialDirectory对象的OpenFileDialog属性。 omething谎言:

OpenFileDialog1.InitialDirectory = My.Computer.FileSystem.SpecialDirectories.MyDocuments

SpecialDirectories下,我无法找到MyVideos的属性。我SpecialDirectories下的唯一属性是:

.Desktop
.MyDocuments
.MyMusic
.MyPictures
.Programfiles
.Programs
.Temp

我错过了什么吗?还有其他方法可以访问这些信息吗?

我可以获取用户的根文件夹,并将其与"视频"结合使用,如下所示:

Dim vidPath As String = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "Videos")

但是,假设用户未在其位置属性中更改其My Videos文件夹的位置。

My Videos Folder - Location Properties

如果用户更改了此位置设置,我想提出一种引用此位置的方法。

1 个答案:

答案 0 :(得分:3)

Environment.SpecialFolder枚举中缺少的文件夹可通过API调用获得。有几个C#答案,主要是部分(获取特定文件夹)。所有(?)缺少的VB版本:

Public Partial Class NativeMethods

    <DllImport("shell32.dll")>
    Private Shared Function SHGetKnownFolderPath(<MarshalAs(UnmanagedType.LPStruct)> 
                                            rfid As Guid,
                                            dwFlags As UInt32,
                                            hToken As IntPtr,
                                            ByRef pszPath As IntPtr) As Int32
    End Function

   ' in order, below are:
    Public Enum ShellSpecialFolders
        Contacts
        Downloads
        Links
        Music
        Pictures
        SavedGames
        SavedSearches
        Videos
    End Enum

    Private Shared ShellFolderGuids As Guid() = {
                        Guid.Parse("{56784854-C6CB-462B-8169-88E350ACB882}"),
                        Guid.Parse("{374DE290-123F-4565-9164-39C4925E467B}"),
                        Guid.Parse("{BFB9D5E0-C6A9-404C-B2B2-AE6DB6AF4968}"),
                        Guid.Parse("{4BD8D571-6D19-48D3-BE97-422220080E43}"),
                        Guid.Parse("{33E28130-4E1E-4676-835A-98395C3BC3BB}"),
                        Guid.Parse("{4C5C32FF-BB9D-43B0-B5B4-2D72E54EAAA4}"),
                        Guid.Parse("{7D1D3A04-DEBB-4115-95CF-2F29DA2920DA}"),
                        Guid.Parse("{18989B1D-99B5-455B-841C-AB7C74E4DDFC}")
                                         }

    Friend Shared Function GetSpecialFolder(folder As ShellSpecialFolders) As String
        Dim ret As Int32
        Dim fPath As IntPtr
        ' == "Dont Vertify" flag:
        Dim SHFlag As UInt32 = &H4000

        ret = SHGetKnownFolderPath(ShellFolderGuids(folder), SHFlag,
                                   New IntPtr(0), fPath)

        If ret = 0 Then
            Return Marshal.PtrToStringUni(fPath)
        Else
            Return ""
        End If
    End Function

    ' Optional single purpose version
    Friend Shared Function GetSpecialVideoFolder() As String
        Return GetSpecialFolder(ShellSpecialFolders.Videos)
    End Function
'...
End Class

使用示例:

spath = NativeMethods.GetSpecialFolder(NativeMethods.ShellSpecialFolders.Videos)
Console.WriteLine("Videos are in: {0}", spath)

或者如果你想为它们写包装器:

spath = NativeMethods.GetSpecialVideoFolder()

如果您想获取默认文件夹(而不是C:\Users\USER NAME\...,则获得C:\Users\Default\...)将IntPtr参数更改为-1:

ret = SHGetKnownFolderPath(ShellFolderGuids(folder), SHFlag,
                               New IntPtr(-1), fPath)

结果:

enter image description here enter image description here

注意:显然返回的文件夹不需要存在。特别是使用默认版本时,我的系统上实际上并不存在多个返回的文件夹。