如何使用iTextSharp测试PDF文档是否符合PDF / A标准？ [英] How can I test if a PDF document is PDF/A compliant using iTextSharp?

问题描述

我有一个现有的PDF文件和iTextSharp我想测试它是否符合PDF / A。

I have a existing PDF file and with iTextSharp I want to test if it is PDF/A compliant.

我不想转换或创建文件，只是阅读并检查它是否是PDF / A.

I don't want convert or create a file, just read and check if it is a PDF/A.

我没有尝试任何东西，因为我没有找到iTextSharp类PdfReader的任何方法或属性，说PDF是PDF / A.目前，知道如何验证该文件声称是PDF / A兼容

I have not tried anything because I did not find any methods or properties of the class PdfReader of iTextSharp, saying that the PDF is PDF/A. For now it would be enough to know how to verify that the document claims to be PDF/A compatible

谢谢
Antonio

Thanks Antonio

推荐答案

经过长时间的搜索，我尝试了这种方式，似乎有效：

After a long search i tried this way and seems to work:

    Dim reader As iTextSharp.text.pdf.PdfReader = New iTextSharp.text.pdf.PdfReader(sFilePdf)
    Dim yMetadata As Byte() = reader.Metadata()
    Dim bPDFA As Boolean = False

    If Not yMetadata Is Nothing Then
        Dim sXmlMetadata = System.Text.ASCIIEncoding.Default.GetString(yMetadata)

        Dim xmlDoc As Xml.XmlDocument = New Xml.XmlDocument()
        xmlDoc.LoadXml(sXmlMetadata)
        Dim nodes As Xml.XmlNodeList = xmlDoc.GetElementsByTagName("pdfaid:conformance")
        If nodes.Item(0).FirstChild.Value.ToUpper = "A" Then
            bPDFA = True
        End If
    End If

    Return bPDFA

我也是找到了一些类XmpReader的引用，但不足以做我想要的事情

I also found some reference to the class XmpReader, but not sufficient to do what I wanted

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