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Debugging converted VB 6.0 to VB.NET COM dlls

Posted on 2009-07-16
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Last Modified: 2013-11-25
I have a VB 6.0 COM dll, that I can open in Visual Studio 6.0. I can set a break point, run it, and debug it.

I recently needed to convert that to a .NET project. It compiles fine, but how do I debug it.
This is what visual studio says......

"A project with an Output Type of Class Library cannot be started directly"
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Question by:silentthread2k
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Expert Comment

by:Éric Moreau
ID: 24872668
You need to create an application (windows form or console or web or ...) that calls your DLL. Only then your breakpoints will work.
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Author Comment

by:silentthread2k
ID: 24872959
Well, this is a 3rd party tool that calls my dll. How can I do this?
I tried added the 3rd party exe to my solution as a project, and then setting it as a startup project, but I got the message from visual studio...

"Debugging information for "blahblah3rdpartyexe.exe" cannot be found or does not match. No symbols loaded.
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Accepted Solution

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silentthread2k earned 0 total points
ID: 24905668
I figure it out. I just have to register my dll from same bin path that Visual Studio creates it in, which is the same path that has the ".pdb"
I needed the .pdb file for debugging purposes.
Any other registration also needs to be done from the same location as the ".pdb" file

After doing all the registration, I set my breakdown.

Then I launched the 3rd party executable. Then I went to my project and selected "Attached to Process" from the debug menu. (You must be in debug mode)

Then I went be to the executable and started doing stuff, and wallah!
When the executable called my dll, it started debugging.

I did not even need to add the 3rd party exe as a project to mysolution. Thank god, that would have been a mission.

I'm glad to know that this can be done. You just kinda have to play with it a bit.
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