Automation

I am sorry that the following problem may not have enough information but I will try my best to explain my situation.

I have written an automation object by Visual C++ 5.0 using its Class Wizard.  Then, the object is used in Visual Basic.  This object has several mehtods.  The methods are computational type and very TIME-CONSUMING but have been tested in the Windows Console mode and can be assumed that they are error-free.  

1) Now, the problem is when these methods are called by VB, it may sometimes pop out the Error Message Box "Automation Error".  

2) However, sometimes it works without any error but the result is different from what I obtained in the Windows Console mode.

 I'd like to know what's going on.  I really have no idea and if anybofy has appropriate suggestion given, I would grant the marks.
LVL 1
HarveyAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

HarveyAuthor Commented:
Edited text of question
0
HarveyAuthor Commented:
Adjusted points to 200
0
Tommy HuiEngineerCommented:
The problem is that most OLE automation controllers have a timeout that when the time expires, it displays an error message saying that the server failed. You should look into breaking up your computation into smaller parts if possible. If it isn't possible, then you probably would want to change your mechanism from an RPC to a callback scheme.

That is instead of calling a function directly, you should call the server to set up some variables, set a callback function and call a function. The function should start a thread and the computation. When the computation is done, the server will call the callback with the results. This way, the actual connection time between the controller and the server is kept to a minimum.

0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.