(VB.NET) Update a String Property in XMP

Demonstrates how to open a JPG or TIF image file, access the XMP metadata, and update the value of a string property. (If the string property does not already exist, it is created.)

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' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim xmp As New Chilkat.Xmp

' Load a JPG or TIF image file.
Dim success As Boolean = xmp.LoadAppFile("qa_data/xmp/AJ_123642_1511.tif")
If (success <> True) Then
    Debug.WriteLine(xmp.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Num embedded XMP docs: " & xmp.NumEmbedded)

' This example assumes that XMP metadata is already present in the image file.
If (xmp.NumEmbedded = 0) Then
    Debug.WriteLine("No XMP metadata already exists..")
    Exit Sub
End If


' Get the XMP metadata.
Dim xml As Chilkat.Xml
xml = xmp.GetEmbedded(0)

' Show the XML:
Debug.WriteLine(xml.GetXml())

' Update (overwrite) a string property.
xmp.AddSimpleStr(xml,"NumberofTimes","123")

success = xmp.SaveAppFile("qa_output/updated.tif")
If (success <> True) Then
    Debug.WriteLine(xmp.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")