Lianja

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..

Lianja

llSuccess = .F.

loBd = createobject("CkBinData")

// I created an extra-small GIF image for this example..
llSuccess = loBd.LoadFile("qa_data/gif/xsmall.gif")
if (llSuccess <> .T.) then
    ? "Failed to load GIF image file."
    release loBd
    return
endif

// Show GIF bytes as base64:
? loBd.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>"

loXml = createobject("CkXml")
llSuccess = loXml.LoadXml(x)

// Get the base64 string:
lcGifBase64 = loXml.GetChildContent("def")

? lcGifBase64

// Load bd with the base64 decoded bytes.  
loBd.Clear()
loBd.AppendEncoded(lcGifBase64,"base64")

// Save to a GIF file.
llSuccess = loBd.WriteFile("qa_output/xsmall.gif")


release loBd
release loXml