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8.2

Trapping a specific HResult from a COMexception in VB.net

Asked by straubtm in Miscellaneous Programming, Microsoft Visual Basic.Net, Algorithms

Tags: vb.net

I have a client that is getting the following error...

System.Runtime.InteropServices.COMException (0x80010002): Call was canceled by the message filter. (Exception from HRESULT: 0x80010002 (RPC_E_CALL_CANCELED))
   at System.Management.ManagementScope.Initialize()
   at System.Management.ManagementObject.Initialize(Boolean getObject)
   at System.Management.ManagementClass.GetInstances(EnumerationOptions options)
   at System.Management.ManagementClass.GetInstances()
(etc., etc.)

The error is caused by the WMI not starting up before the program that is crashing.  I plan to add a 10 sleep and try again if the error is HRESULT: 0x80010002 (RPC_E_CALL_CANCELED)...

BUT, I can't reproduce the error, so I don't know if the code If my error handling will work (or if I coded it correctly).  My since the errorCode is a 32-bit Integer, I'm not sure if I can just convert 80010002 to an int (= 2147549186) and not have to pad it.  Please let me know if the attached code snippet is correctly trapping 0x80010002

Thanks!!!!! 
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Private Function Identifier(ByVal wmiClass As String, ByVal wmiProperty As String) As String
        'Return a hardware identifier
        Try
            Dim Result As String = ""
            Dim mc As New System.Management.ManagementClass(wmiClass)
            Dim moc As System.Management.ManagementObjectCollection = mc.GetInstances
            Dim mo As System.Management.ManagementObject
            For Each mo In moc
                'Only get the first one
                If Result = "" Then
                    Try
                        Result = mo(wmiProperty).ToString
                        Exit For
                    Catch ex As Exception
                        'Ignore error
                    End Try
                End If
            Next mo
 
            Return Result
        Catch ex As Runtime.InteropServices.COMException
            If ex.ErrorCode = 2147549186 Then '0x80010002
                System.Threading.Thread.Sleep(10000)
                Return Identifier(wmiClass, wmiProperty)
            End If
        End Try
        
    End Function
[+][-]10/30/08 09:28 AM, ID: 22842601Accepted Solution

Your question has an Asker Certified™ answer! straubtm verified that this solution worked for them--which means it will likely work for you, too. Click to view the solution free for 30-days now.

About this solution

Zones: Miscellaneous Programming, Microsoft Visual Basic.Net, Algorithms
Tags: vb.net
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Solution Provided By: graye
Participating Experts: 1
Solution Grade: A
 
 
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