How Can I Access a C# DLL from a VB6 Application Using COM Interop?

Accessing a C# DLL in VB6: A Guide to COM Interop

Harnessing the capabilities of a C# DLL within a VB6 application requires converting it into a COM interop component. Here's how you can achieve this:

Creating the C# DLL:

1. Establish a C# class project with an interface for properties, methods, and events.
2. Utilize GUID attributes for the class and interfaces as recommended by MSDN.
3. Check "Make assembly COM-Visible" under "Application" tab in Project Properties.
4. Choose "x86" as the "Platform target" under "Build" tab.

Registering the DLL:

1. Enable "Register for COM Interop" under "Build" tab in Project Properties.

2. Alternatively, use RegAsm to register the DLL manually:

   • Copy the DLL to the desired directory.

   • Open a command shell as administrator and execute:

     RegAsm.exe -tlb -codebase mydll.dll

VB6 Integration:

1. Add a reference to the registered COM DLL in VB6.
2. Utilize Intellisense for seamless access to DLL methods and properties.
3. Invoke the DLL functions like any regular COM component.

Deploying with InstallShield:

1. Create a new Component associated with a Feature in InstallShield.
2. Set ".NET COM Interop" to "Yes" for the component.
3. Add the .dll file and mark it as a "Key File."
4. Add the .tlb file and enable "Self-Register."

Note: Ensure the target PC has the appropriate version of the .Net Framework installed for successful DLL utilization.

The above is the detailed content of How Can I Access a C# DLL from a VB6 Application Using COM Interop?. For more information, please follow other related articles on the PHP Chinese website!