OnPlayerPlayEvent<\/code> event.\n<\/p>\n\nIf you are not sure what an event is, it’s basically a way for one program to tell another that something has happened in that program and the other program may wish to react to it. In this case, a different track has started playing in iTunes.\n<\/p>\n
\nSo how can we get our application to listen out for this? Well firstly we need to say that our programme is interested in these events. We do this by using VB 2005’s WithEvents<\/code> keyword when we create our interface into iTunes.\n<\/p>\n\nSo previously we did this using the following code.\n<\/p>\n
Dim app As New iTunesApp()
\n<\/code><\/div>\n\nNow we have to add in the WithEvents<\/code> keyword as follows.\n<\/p>\nPrivate WithEvents app As New iTunesApp
\n<\/code><\/div>\n\nNow our program can listen out for events from iTunes. You may have noticed I’ve changed Dim<\/code> to Private<\/code>. This is because for this example I’m going to use a Windows Application and not a Console application as before.\n<\/p>\n\nNext we have to create our event handler so we can react to the events iTunes is sending us.\n<\/p>\n
\nThe easiest way to do this is use the method generator at the top of the code view in Visual Basic 2005 Express Edition. My iTunes object is called app<\/var> so we select this, then OnPlayerPlayEvent to create our event handler stub.\n<\/p>\n\n![\"Creating](\"\/robblog\/images\/vb_itunes_event.gif\")
\n<\/p>\n
\nThis passes in the variable iTrack<\/var> as an Object<\/code>. We know this is really an IITTrack<\/var> object, so we need to cast it as such.\n<\/p>\n