Microsoft Visual Basic 6.0
Current Version 1.0.0
Create single instance applications linked to
associated file types. When the associated file
is double clicked it will be handled by a single
instance of your application.
This lets your application act like Media Player rather than Notepad. Each time you double click a media file Media Player does not open a new window but re-uses the existing one.
This is normally difficult to achieve in Visual Basic but the OneOnly control makes it simple and also allows you to create the associations between file types and your application.
Extending the association allows you to add items to the right click pop-up context menu for your associated file types as well.
To achieve this you just need to drop this control on your main form and in the form load event check the AlreadyExists property. If this is True then you need to exit your application.
If all is well then you can use the CreateAssociation and CreateAdditionalAssociation methods to define the file types that are linked to your application.
A NewCommand event is raised in your application whenever an associated file type is launched. You can then examine the passed command line and handle the file in the original instance of your application.
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