Calling CVI DLL Function from Visual Studio

Question

HI all ,
Iv'e created a DLL using CVI and i'm tring to call one of it's function from visual studio 6.0
I'm getting a general error , is there a specific prototype that i need to set my functions in ordrer to call them ?!  
Kobi Kalif
Software Engineer

Answer 1

You will need to distribute the CVI RTE along with your DLL, since anything you write in CVI is going to use the RTE.
As far as calling the DLL functions, you can use the CVI defined macros
<return type> DLLEXPORT DLLSTDCALL <function name> (<param1 type> <param1> ...) {
to declare your functions in the DLL for access by a VS application.
for example
int DLLEXPORT DLLSTDCALL myfunction (int funparam1, double func param2) {
There are options for identifying which functions to export from your DLL, I use "functions marked for export" but there are other choices available.  I also include a type library so when you type the name of a DLL funciton in VS6 you see a balloon popup with the function signature.  This is a check box in the target settings.  You have to create a ".fp" file (function panel file) to collect the function info for the library.
From VB6 you can access the DLL a couple of ways, but I usually add the DLL as a reference.