Reading a property that takes an argument? 1

[EvanK]

I'm just getting back into using VB6 after a very long time, and am working with the iTunes COM interface...I'm having trouble getting an object reference from a property, because the property takes an index and I guess I'm writing it as method.

The object browser gives me a property, and it takes an index:

Property Item(Index As Long) As IITSource
    read-only
    Default member of iTunesLib.IITSourceCollection
    Returns an IITSource object corresponding to the given index (1-based).

I can get a reference to the parent object just fine:

Dim Collection as IITSourceCollection
Set Collection = iTunesApp.Sources

But reading from the property with an argument (the index):

Dim SourceObj as IITSource
SourceObj = Collection.Item(1)

throws the error "Invalid procedure call or argument". am I just missing something obvious?

I would appreciate any help anyone could give me, thanks for taking the time to read this!

 

[Golom]

It probably needs to be a Function (i.e. Method) rather than a property.

The format for a Property definition is

Property Let PropertyName(x As SomeDataType)

or

Property Set PropertyName(x As SomeDataType)

or

Property Get PropertyName() As SomeDataType

Your code has both a calling argument and a return type that's not compatible with its being a property.

 

[EvanK]

No, it is definately a property, as this screenshot from the object browser shows:

http://img122.imageshack.us/my.php?image=itunescomac8.png

Keep in mind, this isn't something I built and can change, this is the public API for iTunes. Could the property perhaps be returning some kind of array or enumeration that i then need to supply an index to? If so, what would the syntax be to access an individual element?

 

[JoeAtWork]

Try this:

Dim SourceObj as IITSource
[COLOR=red]Set[/color] SourceObj = Collection.Item(1)

Also, is the collection zero-based or one-based?

 

[EvanK]

gah, that was it! thanks a bunch. (its 1-based, by the way)