• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 197
  • Last Modified:

Call an entry point in a VB-created DLL

As an experiment I wrote the simplest of VB DLLs which contained one public Function (in a module) and one public Property Let (in a Class). When I tried to call those entry points from another VB program I got a "Can't find DLL entry point..." error when I tried using the name of either the function or the Let in the DLL. I've successfully used DLLs written in C++ so I know how to Declare the DLL so I don't think that's the problem. Could someone supply me with a trivial example of how to create and call an entry point in a VB DLL?
0
Martin Liss
Asked:
Martin Liss
1 Solution
 
JoebobCommented:
The reason the call failed is because DB will only create ActiveX DLLs.  A standard Win32 DLL, such as many C++ DLLS, can be called after using the DECLARE keyword in your module.  ActiveX DLLs are only accessable by setting a reference to the DLL in the Projects->References menu and then instantiating the public class.  With VB DLLs, you will not be able to directly call the function in the standard code module, you can only call functions in classes that are public and you have instantiated.
0
 
ny971181Commented:
Joebob explains the reason, anyhow, i think it is a little bit too general for questionior. not to offend you joebob,

coming from the similar background, I like to know the details of the explaination, so if you are not sure what joebob is talking about, hit us again, i will post more plain english comment for you.

again, not to offend anyone.
0
 
Martin LissRetired ProgrammerAuthor Commented:
I'm pretty sure I know what Joebob is saying, but if you want to give a fuller explanation, please do.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
ny971181Commented:
if you understand, that is no need, like I said, joebob explains it very well in technical point of view. I don't want to take his credit away. :)
0
 
JoebobCommented:
ny971181,

Please, if you feel you can explain it better(simpler) then go ahead.  I am not a member of this group to get credit or points.  I use it to learn and I like to help people when I can.  Learning how to explain things to a lower level is another type of learning, so feel free.
0
 
dgorinCommented:
Joebob, I appreciate your style :)
0
 
ny971181Commented:
say you have a class, myclass in your dll, you want a function call myfunction.

now you have a VB exe, you want to call that function.

1. in your dll, set the function as public instead of private.
2. either run your dll project or make your dll file.
3. in your exe, go to project, reference, check your dll file, it should appears as your dll project title.
4. initiate your object
dim o as mydll
set o = new mydll
5. call your function
o.myfunction ....

did I miss anything?

hopefully not. :)
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now