Go

Extract Metadata XML from PDF

See more PDF Signatures Examples

Demonstrates how to extract the metadata XML from a PDF. Go

    success := false

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

    pdf := chilkat.NewPdf()

    success = pdf.LoadFile("qa_data/pdf/blank_with_metadata.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        return
    }

    sbXml := chilkat.NewStringBuilder()
    // Note: Not all PDF files have metadata.  Metadata is optional.
    success = pdf.GetMetadata(sbXml)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        sbXml.DisposeStringBuilder()
        return
    }

    xml := chilkat.NewXml()
    xml.LoadSb(sbXml,true)

    fmt.Println(*xml.GetXml())

    // Sample PDF metadata XML:
    // (Code for parsing follows)

    // Use this online tool to generate parsing code from sample XML: 
    // Generate Parsing Code from XML

    // <?xml version="1.0" encoding="utf-8"?>
    // <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 9.1-c001 79.675d0f7, 2023/06/11-19:21:16        ">
    //     <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
    //         <rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/" xmlns:pdf="http://ns.adobe.com/pdf/1.3/" xmlns:xmpRights="http://ns.adobe.com/xap/1.0/rights/">
    //             <xmp:ModifyDate>2024-11-27T11:33:12-06:00</xmp:ModifyDate>
    //             <xmp:CreateDate>2024-11-27T11:28:23-06:00</xmp:CreateDate>
    //             <xmp:MetadataDate>2024-11-27T11:33:12-06:00</xmp:MetadataDate>
    //             <xmp:CreatorTool>Adobe Acrobat Pro (32-bit) 24.3.20112</xmp:CreatorTool>
    //             <dc:format>application/pdf</dc:format>
    //             <dc:title>
    //                 <rdf:Alt>
    //                     <rdf:li xml:lang="x-default">Blank</rdf:li>
    //                 </rdf:Alt>
    //             </dc:title>
    //             <dc:creator>
    //                 <rdf:Bag>
    //                     <rdf:li>Chilkat Software</rdf:li>
    //                 </rdf:Bag>
    //             </dc:creator>
    //             <dc:description>
    //                 <rdf:Alt>
    //                     <rdf:li xml:lang="x-default">Blank Document</rdf:li>
    //                 </rdf:Alt>
    //             </dc:description>
    //             <dc:subject>
    //                 <rdf:Bag>
    //                     <rdf:li>blank</rdf:li>
    //                     <rdf:li>metadata</rdf:li>
    //                     <rdf:li>document</rdf:li>
    //                 </rdf:Bag>
    //             </dc:subject>
    //             <xmpMM:DocumentID>uuid:34535ffa-b632-43f1-b1fd-80cea6fdc351</xmpMM:DocumentID>
    //             <xmpMM:InstanceID>uuid:69ace620-4c54-407f-8d45-6eebc90f34c2</xmpMM:InstanceID>
    //             <pdf:Producer>Adobe Acrobat Pro (32-bit) 24.3.20112</pdf:Producer>
    //             <pdf:Keywords>blank; metadata; document</pdf:Keywords>
    //             <xmpRights:WebStatement>https://www.chilkatsoft.com/</xmpRights:WebStatement>
    //         </rdf:Description>
    //     </rdf:RDF>
    // </x:xmpmeta>

    x_xmpmeta_xmlns_x := xml.GetAttrValue("xmlns:x")
    x_xmpmeta_x_xmptk := xml.GetAttrValue("x:xmptk")
    rdf_RDF_xmlns_rdf := xml.ChilkatPath("rdf:RDF|(xmlns:rdf)")
    rdf_Description_rdf_about := xml.ChilkatPath("rdf:RDF|rdf:Description|(rdf:about)")
    rdf_Description_xmlns_xmp := xml.ChilkatPath("rdf:RDF|rdf:Description|(xmlns:xmp)")
    rdf_Description_xmlns_dc := xml.ChilkatPath("rdf:RDF|rdf:Description|(xmlns:dc)")
    rdf_Description_xmlns_xmpMM := xml.ChilkatPath("rdf:RDF|rdf:Description|(xmlns:xmpMM)")
    rdf_Description_xmlns_pdf := xml.ChilkatPath("rdf:RDF|rdf:Description|(xmlns:pdf)")
    rdf_Description_xmlns_xmpRights := xml.ChilkatPath("rdf:RDF|rdf:Description|(xmlns:xmpRights)")
    xmp_ModifyDate := xml.GetChildContent("rdf:RDF|rdf:Description|xmp:ModifyDate")
    xmp_CreateDate := xml.GetChildContent("rdf:RDF|rdf:Description|xmp:CreateDate")
    xmp_MetadataDate := xml.GetChildContent("rdf:RDF|rdf:Description|xmp:MetadataDate")
    xmp_CreatorTool := xml.GetChildContent("rdf:RDF|rdf:Description|xmp:CreatorTool")
    dc_format := xml.GetChildContent("rdf:RDF|rdf:Description|dc:format")
    rdf_li_xml_lang := xml.ChilkatPath("rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li|(xml:lang)")
    rdf_li := xml.GetChildContent("rdf:RDF|rdf:Description|dc:title|rdf:Alt|rdf:li")
    rdf_li = xml.GetChildContent("rdf:RDF|rdf:Description|dc:creator|rdf:Bag|rdf:li")
    rdf_li_xml_lang = xml.ChilkatPath("rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li|(xml:lang)")
    rdf_li = xml.GetChildContent("rdf:RDF|rdf:Description|dc:description|rdf:Alt|rdf:li")
    i := 0
    count_i := xml.NumChildrenHavingTag("rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li")
    for i < count_i {
        xml.SetI(i)
        rdf_li = xml.GetChildContent("rdf:RDF|rdf:Description|dc:subject|rdf:Bag|rdf:li[i]")
        i = i + 1
    }

    xmpMM_DocumentID := xml.GetChildContent("rdf:RDF|rdf:Description|xmpMM:DocumentID")
    xmpMM_InstanceID := xml.GetChildContent("rdf:RDF|rdf:Description|xmpMM:InstanceID")
    pdf_Producer := xml.GetChildContent("rdf:RDF|rdf:Description|pdf:Producer")
    pdf_Keywords := xml.GetChildContent("rdf:RDF|rdf:Description|pdf:Keywords")
    xmpRights_WebStatement := xml.GetChildContent("rdf:RDF|rdf:Description|xmpRights:WebStatement")

    pdf.DisposePdf()
    sbXml.DisposeStringBuilder()
    xml.DisposeXml()