Unable to cast COM object of type 'system;_ComObject'

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So what i am trying to do is download a zip file from the internet and then extract it, it works perfectly on my computer but when i try it on my other computer it just says this warning: Unhandled exeption has occured in your application. If you click continue, the application will ignore this error etc then it says Unable to cast COM object of type 'system;_ComObject' to interface type "Shell32.Shell" and it goes on like that, i really need to fix this quickly, pls help me?

This is my code to extract the zip file

VB

Dim path As String = Directory.GetCurrentDirectory()
      Dim sc As New Shell32.Shell()
      IO.Directory.CreateDirectory(path & "\extract")
      Dim output As Shell32.Folder = sc.NameSpace(path & "\extract")
      Dim input As Shell32.Folder = sc.NameSpace(path & "\mods.zip")
      output.CopyHere(input.Items, 4)

Posted 5-Nov-14 6:28am

Member 11202889

Updated 5-Nov-14 6:53am

v2

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Richard Deeming 5-Nov-14 12:39pm

Since you haven't shown any of your code, we can't tell you how to fix it.

If you change your code to use the built-in ZipFile class[^], you won't get that error.

Member 11202889 5-Nov-14 13:42pm

How can i do this?

2 solutions

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Richard Deeming · Answer 1 · 2014-11-05T08:51:00

Assuming you're using .NET 4.5, you can use the built-in ZipFile class[^].

Add a reference to the System.IO.Compression.FileSystem assembly, and Import the System.IO.Compression namespace. Then use:

VB.NET

Dim path As String = IO.Directory.GetCurrentDirectory()
Dim zipPath As String = IO.Path.Combine(path, "mods.zip")
If Not IO.File.Exists(zipPath) Then
    Throw New IO.FileNotFoundException(Nothing, zipPath)
End If

Dim extractPath As String = IO.Path.Combine(path, "extract")
If Not IO.Directory.Exists(extractPath) Then
    IO.Directory.CreateDirectory(extractPath)
End If

ZipFile.ExtractToDirectory(zipPath, extractPath)

If you're using .NET 4.0 or earlier, then you can use a third-party library such as SharpZipLib[^] or DotNetZip[^] to extract the file.

Member 11202889 · Answer 2 · 2014-11-05T07:38:00

Solution 2

How can i do use that zipfile class?

Posted 5-Nov-14 7:38am