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DataFlex Examples

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(DataFlex) 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..

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoBd
    Boolean iSuccess
    String x
    Handle hoXml
    String sGifBase64
    String sTemp1

    Get Create (RefClass(cComChilkatBinData)) To hoBd
    If (Not(IsComObjectCreated(hoBd))) Begin
        Send CreateComObject of hoBd
    End

    //  I created an extra-small GIF image for this example..
    Get ComLoadFile Of hoBd "qa_data/gif/xsmall.gif" To iSuccess
    If (iSuccess <> True) Begin
        Showln "Failed to load GIF image file."
        Procedure_Return
    End

    //  Show GIF bytes as base64:
    Get ComGetEncoded Of hoBd "base64" To sTemp1
    Showln sTemp1

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

    //  Let's begin with an XML string:
    Move "<abc><def>R0lGODlhBQAFAMQAAAAAAP////z8/PHx8evr6+jo6OHh4d7e3sPDw8LCwpqamo2NjWxsbGRkZFpaWk1NTUtLS0hISCwsLCQkJP///wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAEAABQALAAAAAAFAAUAAAUTYCAYQUBAU1lI0TIgztE8jFImIQA7</def></abc>" To x

    Get Create (RefClass(cComChilkatXml)) To hoXml
    If (Not(IsComObjectCreated(hoXml))) Begin
        Send CreateComObject of hoXml
    End
    Get ComLoadXml Of hoXml x To iSuccess

    //  Get the base64 string:
    Get ComGetChildContent Of hoXml "def" To sGifBase64

    Showln sGifBase64

    //  Load bd with the base64 decoded bytes.
    Get ComClear Of hoBd To iSuccess
    Get ComAppendEncoded Of hoBd sGifBase64 "base64" To iSuccess

    //  Save to a GIF file.
    Get ComWriteFile Of hoBd "qa_output/xsmall.gif" To iSuccess


End_Procedure

 

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