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04.07.2008 at 07:21AM PDT, ID: 23301420
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.Net interop and "The specified module could not be found" HRESULT 0x8007007E
This is complex, but I'll try to explain completely & succinctly.

I have a VB6 application (call it App), using a .Net 3.5 assembly (call it Bridge) that calls other assemblies including a .Net 1.1 assembly written in VC++ (call it Worker).

Note that this configuration and installation set is working on multiple Windows XP and Server 2000 / 2003 systems.  But I have one client terminal server that is giving me no end of grief.

When App tells Bridge to call Worker, Bridge throws the exception in the title.  App duly logs it.

So ... I can talk to Bridge, but not to Worker.

Worker is in the same directory as App and Bridge.  I've tried running Regasm on Worker -- to no avail.  I've pulled Worker into the GAC -- to no avail.

Based on http://weblogs.asp.net/rchartier/archive/2005/02/28/381863.aspx I've tried regsvr32 %systemroot%\System32\Scrrun.dll -- to no avail.

I've rebooted with almost every change -- to no avail.

Versions of the Framework installed as reported by Control Panel are:
1.1
2.0 SP 1
3.0 SP 1
3.5

I let Windows Update apply Service Pack 1 for Framework 1.1 -- to no avail.

Ideas?

Thanks!
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Question Stats
Zone: Microsoft
Question Asked By: DanielWilson
Solution Provided By: DanielWilson
Participating Experts: 1
Solution Grade: A
Views: 78
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04.08.2008 at 07:11AM PDT, ID: 21305422

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04.08.2008 at 10:12AM PDT, ID: 21307390

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04.08.2008 at 10:42AM PDT, ID: 21307681

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04.08.2008 at 11:37AM PDT, ID: 21308209

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04.14.2008 at 07:27AM PDT, ID: 21350281

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04.14.2008 at 07:39AM PDT, ID: 21350395

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04.18.2008 at 10:21AM PDT, ID: 21387822

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04.08.2008 at 07:11AM PDT, ID: 21305422
Try using the Fusion binding log viewer - fuxlogvw.exe - http://msdn2.microsoft.com/en-us/library/e74a18c4(VS.71).aspx

Find it in your Visual Studio folder or .NET SDK folder -- SDK\v1.1\Bin or SDK\v2.0\Bin

You should be able to use it to see why the CLR loader can not find your module.  Google Suzanne Cook's blog for lots of help with these kind of problems.
Assisted Solution
 
04.08.2008 at 10:12AM PDT, ID: 21307390
Thanks for the suggestion.  Unfortunately that tool reports success ... while the error still comes back.

Further ideas?
 
04.08.2008 at 10:42AM PDT, ID: 21307681
Strange, did you manage to get fuslogvw to log anything, the sucessfull loads for example?

did you find this blog entry?  http://blogs.msdn.com/suzcook/archive/2003/05/29/debugging-assembly-loading-failures.aspx

How does the VB6 app load and run 'Bridge'?

Also how does 'Bridge' attempt to run 'Worker'?  Is it loaded dynamically or is there a direct reference?

Finally, sounds obvious, but how does the configuration on the failing client compare to the working ones - runtimes and patches installed etc.
 
04.08.2008 at 11:37AM PDT, ID: 21308209
yes, that blog entry was where I learned to use the tool -- since you recommended her blog.

App:
Dim B as new Bridge
B.SetupSystem()


Bridge:
Public Sub SetupSystem()
  Dim W as Worker
  W = new Worker
End Sub

>>Finally, sounds obvious, but how does the configuration on the failing client compare to the working ones - runtimes and patches installed etc.

Don't I wish I knew! Comparing to our "clean" test system ... Both have .Net frameworks 1.1 and 3.5.  Both are XP SP2. On both Windows update reports that all patches are installed.

Not sure where to turn next ...
 
04.14.2008 at 07:27AM PDT, ID: 21350281
>>how does the configuration on the failing client compare to the working ones

We've found a possible lead we are pursuing.

The test system runs XP Pro, but its start menu claims it is running Terminal Server.  One of the guys working on this for me says this is XP running in Terminal mode.  He's trying to set our test system up on that configuration to attempt to replicate the problem.
 
04.14.2008 at 07:39AM PDT, ID: 21350395
Forget the last post.  We figured out that "XP in terminal mode" is nonsense.
 
04.18.2008 at 10:21AM PDT, ID: 21387822
Well, we've switched to another computer -- which works.  Thanks for the suggestions!
Accepted Solution
 
 
20080236-EE-VQP-29 / EE_QW_EXPERT_20070906