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Determine available disk space

Posted on 2004-10-03
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Last Modified: 2012-06-27
Hi,

Before creating a new database I'd like to check if there's enough available disk space in the drive of the directory selected by the user to create the database in.

I have a sub that determines the root of  the directory selected by the user.

I have have found in MSDN the following code to return the available disk space:

Public Function GetDiskSpace() As System.UInt64
    Dim diskClass As _
        New System.Management.ManagementClass("Win32_LogicalDisk")
    Dim disks As System.Management.ManagementObjectCollection = _
        diskClass.GetInstances()
    Dim disk As System.Management.ManagementObject
    Dim space As System.UInt64
    For Each disk In disks
        If CStr(disk("Name")) = "C:" Then
            space = CType(disk("FreeSpace"), System.UInt64)
        End If
    Next disk
    Return space
End Function

However an exception is raised saying that "The property requested ("Name") does not exist".

They do say in MSDN that such an exception may be raised but they don't say why and what to do about it!

Any help shall be appreciated from the VB.NET beginner that I am.


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Question by:Ghanisen
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5 Comments
 
LVL 22

Expert Comment

by:Mohammed Nasman
ID: 12212169
Hello

  Your code worked fine with me, I just copy and paste and that's work

  Are you using Vs2002 or VS2003?, and .net framework that installed 1.0 or 1.1?

maybe this code require framework 1.1
0
 

Author Comment

by:Ghanisen
ID: 12212384
hi mnasman,

I'm using VS2003 and Framework version 1.1 and the code above raises an exception about the "disk(Name)".

Another issue is that I don't want to scan all the drives to get their available space.

I want to determine available disk space for a drive of my choice, e.g. "c:\"

Hope someone can help.

Thanks for your contribution.
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LVL 22

Accepted Solution

by:
Mohammed Nasman earned 500 total points
ID: 12212398
as I said before, just copy and paste and it worked

    Public Function GetDiskSpace() As System.UInt64
        Dim diskClass As _
            New System.Management.ManagementClass("Win32_LogicalDisk")
        Dim disks As System.Management.ManagementObjectCollection = _
            diskClass.GetInstances()
        Dim disk As System.Management.ManagementObject
        Dim space As System.UInt64
        For Each disk In disks
            If CStr(disk("Name")) = "C:" Then
                space = CType(disk("FreeSpace"), System.UInt64)
            End If
        Next disk
        Return space
    End Function
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        MsgBox(GetDiskSpace.ToString())
    End Sub

Did you add reference to System.Management assembly?
0
 

Author Comment

by:Ghanisen
ID: 12212876
Hi mnasman,

I do get the drive size but only for the "c:" drive as indicated in the code above. I get it also for my "d:" drive if I replace "c:"  by "d:" in the code above.

My problem is that I don't know which drive the user will select. I have a sub that finds out what drive he has selected and the name of that drive (e.g. "D:") is returned in a variable named repName.

I'd like to be able to replace "C:" in ( CStr(disk("Name")) = "C:" ) by (CStr(disk("Name")) = " & repName &") or something of the sort.

I noticed also a huge difference betwween the drive size given by this function and what windows explorer gives for my C drive :

Function :  92,555,206,656 bytes
Windows Explorer : 86,1 Gbytes

That means a difference of about 6 Gbytes!

I hope you've got something to propose.

Thanks for trying


0
 

Author Comment

by:Ghanisen
ID: 12213110
Hi mnasman

I found a solution which is not very elegant (I suppose I can improve it later with Case ) :

  Public Function GetDiskSpace() As System.UInt64

        Dim di As DirectoryInfo
        di = New DirectoryInfo(CheminChoisi)

        Dim RepName As String

        RepName = di.Root.ToString.TrimEnd("\")

        Dim diskClass As New System.Management.ManagementClass("Win32_LogicalDisk")
        Dim disks As System.Management.ManagementObjectCollection = diskClass.GetInstances()
        Dim disk As System.Management.ManagementObject
        Dim space As System.UInt64

        For Each disk In disks
            If RepName = "C:" Then
                If CStr(disk("Name")) = "C:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            ElseIf RepName = "D:" Then
                If CStr(disk("Name")) = "D:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            ElseIf RepName = "E:" Then
                If CStr(disk("Name")) = "E:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            ElseIf RepName = "F:" Then
                If CStr(disk("Name")) = "F:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            ElseIf RepName = "G:" Then
                If CStr(disk("Name")) = "G:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            ElseIf RepName = "H:" Then
                If CStr(disk("Name")) = "H:" Then
                    space = CType(disk("FreeSpace"), System.UInt64)
                End If
            End If
        Next
        Return space

    End Function

It works fine.

Anyway you get the 500 points because you tried to help and actually at least encouraged me to keep trying since the MSDN code worked for you.

Thanks.
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