MDI: avoid twice form

[Dadone]

Hi all,
I have a project based on a MDI form. I need to avoid to open a child twice. How can I check if an instance of the FormXX exist or not?

Thanks in advance

 

[vladk]

Dadone,

I am not positive but you might want to employ Load and Dispose Form object events.

Say, set some boolean to true in Load and to false in Dispose.

I am sure that some better approaches should exist.

vladk

 

[Dadone]

Hi vladk,
thanx for your suggestion. I discovered that in the 2005 version the problem is solved because there is the concept of 'default instance'. You can do operation on the object without declaration as VB6

Dadone

 

[ThatRickGuy]

The other option is to use a "Singleton design". Search google for the term, there's plenty of samples out there.

-Rick

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