Event Callbacks when Adding File References to the Zip Object

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Demonstrates event callbacks for the AppendFiles and AppendFilesEx methods.

    ' When using events, we must declare the variable as a global or
    ' class member WithEvents
    ' Once it is declared, we can select the "zip" object from 
    ' the VB.NET IDE to see the events.  If you select the event
    ' from the dropdown, Visual Studio will create the callback
    ' subroutine for you.
    Dim WithEvents zip As New Chilkat.Zip()

    ' Demonstrates event callbacks when adding references to files with
    ' the AppendFiles(Ex) method.  The AppendFiles method simply adds file
    ' references to the zip object.  It may be called multiple times to add 
    ' different files or different directory sub-trees.  The .zip file is 
    ' created when WriteZip is called. It is at that point when all files
    ' referenced by the zip object are gathered and compressed into the zip archive.
    Private Sub Button6_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
        ' These two lines can be called once at the beginning of your program.
        zip.UnlockComponent("Anything for 30-day trial")
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        ' Don't forget to enable events.
        zip.EnableEvents = True

        ' Initialize our Zip object.
        zip.NewZip("myZip.zip")

        ' Add some files.
        Dim success As Boolean
        Dim recurseDirectories As Boolean
        Dim saveExtraPath As Boolean
        Dim archiveOnly As Boolean
        Dim includeHidden As Boolean
        Dim includeSystem As Boolean
        recurseDirectories = True
        saveExtraPath = False
        archiveOnly = False
        includeHidden = True
        includeSystem = True
        ' When SaveExtraPath is false, we will create a zip containing
        ' relative directory paths.  In this case, the zip is created as if
        ' our current working directory was "c:/temp/a".
        ' The AppendFiles callbacks are listed in the subroutines below...
        '
        ' NOTE: The AppendFilesEx method does not create a .zip file on disk.
        ' It simply adds file references to the zip.  When WriteZip (or WriteExe, WriteZipAndClose, etc.) is called,
        ' all files and data referenced by the Zip object are included in the .zip that is created.
        success = zip.AppendFilesEx("c:/temp/a/*", recurseDirectories, saveExtraPath, archiveOnly, includeHidden, includeSystem)
        If (Not success) Then
            MessageBox.Show(zip.LastErrorText)
            Exit Sub
        End If

        'success = zip.WriteZipAndClose()
        'If (Not success) Then
        'MessageBox.Show(zip.LastErrorText)
        'Exit Sub
        'End If

        MessageBox.Show("Done!")

    End Sub

    ' Called once at the very beginning of an AppendFiles(Ex) method.
    Private Sub zip_OnAddFilesBegin(ByVal sender As Object, ByVal args As System.EventArgs) Handles zip.OnAddFilesBegin

    End Sub

    ' Called once at the very end of an AppendFiles(Ex) method.
    Private Sub zip_OnAddFilesEnd(ByVal sender As Object, ByVal args As System.EventArgs) Handles zip.OnAddFilesEnd

    End Sub

    ' Called once for each directory before the reference to the file is appended
    ' to the Zip object.
    Private Sub zip_OnDirToBeAdded(ByVal sender As Object, ByVal args As Chilkat.DirToBeAddedEventArgs) Handles zip.OnDirToBeAdded
        ' args contains two members:
        ' args.Exclude - Set this to True to exclude the directory from being added.
        ' args.DirName - The directory path to be added.
        ListBox1.Items.Add("DIR: " + args.DirName)
    End Sub

    ' Called once for each file before the reference to the file is appended
    ' to the Zip object.
    Private Sub zip_OnToBeAdded(ByVal sender As Object, ByVal args As Chilkat.ToBeAddedEventArgs) Handles zip.OnToBeAdded
        ' args contains three members:
        ' args.Exclude - Set this to True to prevent the file from being added.
        ' args.FileName - The filename (and path) of the file to be added.
        ' args.FileSize - The size of the file (in bytes) to be added.
        ListBox1.Items.Add(args.FileName)
    End Sub

    ' Called once for each file after a reference to it has been added to the zip object.
    Private Sub zip_OnFileAdded(ByVal sender As Object, ByVal args As Chilkat.FileAddedEventArgs) Handles zip.OnFileAdded
        ' args contains three members:
        ' args.Abort - Set this to True to abort the AppendFiles(Ex) method.
        ' args.FileName - The filename (and path) of the file to be added.
        ' args.FileSize - The size of the file (in bytes) to be added.
        ListBox2.Items.Add(args.FileName)
    End Sub