How to access or register a dll developed in C++ (VS 6.0) with C# application.

Hi,
How can I register or access a native dll (win32) developed in c++ on VS6.0 with visual studio 2008 C# app targetted to 2.0 framework.
I have tried to register with regsvr32 (of system32 on an XP SP2 machine), but was endup receiving an error message, "specified module could not be found". and some time "Invalid access to memory location".
I have tried with admin access and couldn't succeed.
I even have tried dependency walker to know if there might be any reference issues... and couldn't actually found any...
This is a legacy code and is to be run with same hardware setup...
Please help me on this...
Thanks,
Manoj

Thank you Bordon for the quick reply.
I have tried [DllImport("<dllname>", , CallingConvention = CallingConvention.Cdecl)] but also endup with same error, "specified
module could not be found". and some time "Invalid access to memory location".
I have been trying from a week and couldn't forward on this.
Appreciate any suggestion or workarounds on this..
Thanks,
Manoj.

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jay44 wrote:
Bare in mind I am attempting the context.lookup() from inside the container (my code is in a session bean). I have accessed the server and have my bean "say hello" first to verify the bean works OK, then I call a method with this rather standard code:
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But when I run the code the server log shows the initial context is created Ok, but an exception is thrown becasue the resource name is not found:
(and i have tried vriations of ctx.lookup("jdbc/"+jndiDataSourceName) etc etc
You are fine here. It works in container because the InitialContext properties have been supplied already. That was the link I forwarded earlier. The InitialContext you create locally needs to locate the container JNDI. That is what the properties specify.
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That is why you can obtain a lookup from within the container (app server).
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So that is exactly where I am stuck, trying to get the lookup to work and wondering if it should work without and xml file mapping the resource for my app.
What we ended up doing for standalone was to provide our own JNDI. If you look at the open source project JOTM, there are examples on how to use that with XBean (if integrating with Spring, as we did), you can easily set up a data source that runs standalone exactly as you get in the container. Another benefit is you get full JTA/JTS support and the ability to run XA transactions. (This might all be alphabet soup, but the app server gives it to you, and this is the way we ended up doing the same: JNDI + JTA + JTS + XA). It ends up the same application code uses a "vanilla" InitialContext and all we have to do is write one or two xml files (one for our app server, a couple for JOTM), and our actual code works the same.
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I think there must be a simple way to do this with an ejb-jar.xml, I am no expert in JNDI, I could be missing something simple, I will keep at it and post an answer here if I come up with it.
Thanks, jayIt is simple to code. Getting it to integrate with your app server, yes, that can be challenging. But it has nothing to do with EJB's. Write a simple test. Using nothing but DataSource and InitialContext. Let us know where you get stuck.
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