Call vb6 dll from c #

Question

I am trying to call a vb6 dll from a C application without using the registry. I want to use the path to the dll when using it. I can not create an object of class dll vb. Please help! The code I have written so far is as follows:

Assembly assem = Assembly.LoadFile("dll path"); Type classType = assem.GetType("classname"); MethodInfo method = classType.GetMethod("show"); //My methos is called show method.Invoke(null,null); // I have to invoke the method using class object, which I am unable to create 

Answer 1

VB6 DLL is a COM library. Usually you register the DLL (in the registry) and then add the link to the VB6 DLL from your .NET project.

This MSDN article provides a step-by-step guide on using a COM application without using a COM application.

Answer 2

Your VB6 library, as MarkJ mentioned, is a COM-Dll, and they usually need to be registered with regsvr32 before you can use them.

After registration, you can add a link to it in the same way as with .NET dll, that is, right-click the "Links" link in the project, click "Add Link", then select the "COM" tab in the window and see your COM Name Dll.

Then you can use it as a .NET link.
The following is an example of using the COM link to Microsoft Excel.
A practical guide. Using COM Interop to Create an Excel Spreadsheet

If you need a late binding, then your dll should still be registered, but you don’t manually add the link, you use Activator.CreateInstance () to get an instance of your COM object.
Call COM component from C # using late binding

Answer 3

Assuming the show method is in the export table in the dll, try using DllImportAttribute to call the show method.