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Calling a Sub or a Function with their names on a string.

Posted on 2000-03-06
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Last Modified: 2010-05-02
How can I call a Sub or a Function, witch name is on a string ?

In C I could use a pointer to a function. How can I do this in VB ?

Thank you.
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Question by:mbarreto022800
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7 Comments
 
LVL 3

Expert Comment

by:groone
ID: 2588827
can you elaborate a bit what you are wanting to do?
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LVL 14

Expert Comment

by:mcrider
ID: 2588840
Well in VB5, you need to do a Case statement... for example:


Select Case GotoVariable
   Case "Function1": Function1
   Case "Function2": Function2
   Case "Function3": Function3
End Select



Cheers!®©
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LVL 32

Accepted Solution

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Erick37 earned 180 total points
ID: 2588849
"HOWTO: Use the CallByName Function to Run a Procedure"

http://support.microsoft.com/support/kb/articles/Q186/1/43.ASP
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LVL 7

Expert Comment

by:Vbmaster
ID: 2589368
The CallByName function is a VB6-only function, but there is a way to implement this in VB5 too, let me know and I can put up the solution on my webpage or something.
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LVL 14

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by:wsh2
ID: 2590139
Wait... VbMaster.. you have a Webpage?.. As I am a fan.. Wow, would I ever like to check that place out!!! Anyhow.. on to the question.. <smile>.

Yes.. VB6 has a Callbyname option.. but please be advised that in using it, you can pay a very high price in performance.. as there is considerable processing overhead in late binding a procedure. Once and done, type Calls are certainly ok, but a Callbyname employed in a tight loop.. only makes me shudder with long awaited <yawn> anticipation.

In lieu of what Vbmaster may have in mind.. the best and safest bet is still brute force and ignorance.. and SELECT CASE your logical troubles away.. as mcrider has so cogently proposed.. <smile>.
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Author Comment

by:mbarreto022800
ID: 2595246
Well, I've already thought on using a "SELECT CASE" but... let me elaborate a bit what I'm wanting to do, like groone asked. I'm writting an software application that will need to write on other applications databases at some point. I was thinking on making a table on my database, describing the applications I'll need to connect. On that table, I thought in creating a field with the name of the function or sub that would write on the tables of that application (since I don't know at start, the configuration of those tables). Then, every time I would need to connect with a new application I would only need to configure the aplication on that table and make a new module with the function or sub, without worrying about all the places on the code where i have those "SELECT CASE"s.
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Author Comment

by:mbarreto022800
ID: 2595330
The CallByName Function worked just fine, thank you Erick37 .

Ps. I only work with VB6, Vbmaster, thank you anyway.
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