Thread: Sending a string to C++ from VB 6.

I think that you can always have him compile everything into an object file, and then link the object file with your files, and use it that way...

I'm assuming you are talking about a DLL or OCX or something like that here, so you can send parameters.

>How do I send a string from VB to C++

Declare it as const char* in the C function.
Declare it as ByRef String in VB.
( Test it with ByVal if it gets you garbage, it's been some
time since I did this... )

This way you should be able to get the string across.
The other way 'round is a pain in the a##.

Compile your C++ as a dll.

In the VB you declare the function you want from the C++ class the same way as you would declare an API function call.

Then you just use the C++ function in the VB.

I am not sure that there is a way to turn this around so that you are compiling VB to use inside C++. I think this is because adding VB to C++ slows down the C++ program. Adding C++ to VB- speeds up the VB program.

If you want to see an example of C++ used to enhance VB code you can check out the January 2001 issue of VB Programmer's Journal.

I do not know if the code would still be available from devx.com but it might be worth looking if you can't dig up an actual copy of the magazine.