(Excel) Decode Base64 Image String (GIF, JPG, etc.) and Save to File

I have an XML response that includes a base 64 encoded image string (UPS label). It's a huge string and I need to save it as a gif file on my users pc.

This example shows how to do it..

Download Excel Class Modules Chilkat Excel Class Modules

Dim bd As Chilkat.BinData
Set bd = Chilkat.NewBinData

'  I created an extra-small GIF image for this example..

success = bd.LoadFile("qa_data/gif/xsmall.gif")
If (success <> True) Then
    Debug.Print "Failed to load GIF image file."
    Exit Sub
End If

'  Show GIF bytes as base64:
Debug.Print bd.GetEncoded("base64")

'  This particular GIF in base64 is this:
'  R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7

'  Let's begin with an XML string:

x = "<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>"

Dim xml As Chilkat.Xml
Set xml = Chilkat.NewXml
success = xml.LoadXml(x)

'  Get the base64 string:

gifBase64 = xml.GetChildContent("def")

Debug.Print gifBase64

'  Load bd with the base64 decoded bytes.
success = bd.Clear()
success = bd.AppendEncoded(gifBase64,"base64")

'  Save to a GIF file.
success = bd.WriteFile("qa_output/xsmall.gif")