I have to work with an existing API that is written in C++. Is it possible to write the new code in VB and still access the functions that are defined in the C++ libraries and header files? I know .NET has the ability to allow for different parts of a project to be written in differnet languages. I'm just not sure how to do it. Any help would be greatly appreciated. Thanks.

Compile the api into an ActiveX Dll. ActiveX Dll can be accessed from both VB & VB.Net

How might one make an ActiveX.dll using Visual Studio?

This must be done from C++. I am not familiar with the process of doing so and only know it can be done. To find out how to do it, go to a C++ news group and ask how or use google to search for it.

Good Luck,
Yehuda

This is not true. You can create a solution that includes multiple projects and each project can be based in a different .NET supported language. It may be possible to bring the C++ code into a .NET class library project. You may need to do some converting to it however. Otherwise, I echo what Yehuda suggested. Compile the C++ to an ActiveX COM object and then include a reference to it in your .NET project.