System, .entry point not found exception

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I am integrating a third party dll into our application. our application was developed on .net framework 1.1 and was developed in vb .net.

What I have tried:

I am adding the reference of dll into the application as below

Declare Function Begin Lib "pro.dll" () As String

and accessing the method in the dll as below when a button clicks

string result=Begin()

The problem raises when the debugger comes to the above line and throwing the exception unable to find an entry point named Begin the dll

Posted 30-Jan-18 16:28pm

Member 13142345

Updated 30-Jan-18 18:26pm

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phil.o 30-Jan-18 23:13pm

A .dll is not meaningful per se; it can be a managed (.NET) dll, or an unmanaged one. What you are using tends to mean that it is an unmanaged library, but you simply did not provide enough information for us to help.

Member 13142345 30-Jan-18 23:52pm

the dll application is developed on the .net framewrok 2.0

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Patrice T · Answer 1 · 2018-01-30T16:48:00

Solution 1

Quote:
I am integrating a third party dll into our application.

Never thought about talking to dll author/support ?
You gave no information about the dll. Do you have an idea of how many dll files are named 'pro.dll' ?
It is impossible to help you without anything useful.

Posted 30-Jan-18 16:48pm

Patrice T

Dave Kreskowiak · Answer 2 · 2018-01-30T18:26:00

You're trying to use a .dll using P/Invoke. That "Declare ... yada yada yada" line is how you define a function that's implemented in an un-managed code external library.

Oh, and you're declaring it wrong too. That's why you're getting the error message you're getting.

You have a much larger problem though.

You can't use a .NET 2.0 .DLL in a .NET 1.1 application. You have to recompile, and possible rewrite, your application targeting .NET 2.0 to use the .DLL.

Using the .DLL is rather simple. In your application project, add a reference to the .DLL file and import the namespaces you need. What you do after that depends entirely on the .DLL you're using and how it exposes its classes and methods.