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CREATEOBJECT WITHIN A PROJECT

Posted on 2000-04-13
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Last Modified: 2012-05-04
Can you use createobject to instantiate an Object from a server class which is in the same project as the client class ? If you can, then how. (Note I do not want to use the new key word)
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Question by:leecarroll
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by:Marine
ID: 2713794
If not why not create a Group Project and do it from there. This  will garantee it will work.
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by:leecarroll
ID: 2713905
Adjusted points from 100 to 200
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Author Comment

by:leecarroll
ID: 2713906
The two classes will live in the same component, so they can't be in a different project. (I've read that you should use createobject within a component if you are going to use mts and you wish the object to have an object context, new does not cut the mustard as it does not use com.) Is my understanding of MTS at fault here, I feel that i'm missing something. I know i've just widen the question with this comment so i'll up the points
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ameba earned 200 total points
ID: 2714259
You cannot do this in 'standard exe' project type.
Change project type to ActiveX EXE and then it will work.

When you change project type, you'll perhaps need 'Sub Main' for startup. In 'Sub Main' call your main form.

From VB documentation for CreateObject:
"Note   The CreateObject function cannot be used on classes whose Instancing property is Private or PublicNotCreatable. The New operator can be used on any class."
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Expert Comment

by:ameba
ID: 2714272
Sample:
   Dim x As clsCustomer
   Set x = CreateObject("Project1.clsCustomer")
   x.Name = "John"  ' early bound call!
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Expert Comment

by:caraf_g
ID: 2715126
"in the same project"

WHY? You're guaranteed to have a reference as it's in the same project, so just use the New keyword.

There is absolutely *NO* need to use MTS for communication between objects in the same project. Just use globals or appropriate methods and properties to achieve your goal.

Hm.... perhaps I'm missing something?
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Expert Comment

by:corvanderlinden
ID: 2715401
If you are using MTS, you have to use an ActiveX DLL.

MTS heavily relies on COM.

Using New to create an Object that is part of the same project will bypass COM
CreateObject always uses COM.

New will use COM if you are creating an object in a different project

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Author Comment

by:leecarroll
ID: 2717707
All the comments are pretty good but Ameba got it spot on. To use Createobject the object has to be externally creatable !! Thats what i was missing.
Cheers Lee
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LVL 15

Expert Comment

by:ameba
ID: 2717928
to caraf_g
>"in the same project"
>WHY?

It is good idea to start with a single project. This makes debugging easier/faster.
When things are prototyped, you can split and organize components.
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