Go

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..

Go

    success := false

    bd := chilkat.NewBinData()

    // I created an extra-small GIF image for this example..
    success = bd.LoadFile("qa_data/gif/xsmall.gif")
    if success != true {
        fmt.Println("Failed to load GIF image file.")
        bd.DisposeBinData()
        return
    }

    // Show GIF bytes as base64:
    fmt.Println(*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>"

    xml := chilkat.NewXml()
    success = xml.LoadXml(x)

    // Get the base64 string:
    gifBase64 := xml.GetChildContent("def")

    fmt.Println(*gifBase64)

    // Load bd with the base64 decoded bytes.  
    bd.Clear()
    bd.AppendEncoded(*gifBase64,"base64")

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

    bd.DisposeBinData()
    xml.DisposeXml()