How to retrieve custom metadata from exisisting PDF document?
The custom metadata value added to a WinForms PDF document can be retrieved from XmpMetadata of DocumentInformation found in PdfLoadedDocument with the Custom metadata key which is given during addition of custom metadata to a PDF document:
Please find the code snippet for adding custom metadata to a PDF document with key and value:
C#:
//Create custom schema with namespace. CustomSchema customSchema = new CustomSchema(metaData, "custom", "http://www.syncfusion.com"); customSchema["CutomKey1"] = "CustomValue1"; customSchema["CutomKey2"] = "CustomValue2"; customSchema["CutomKey3"] = "CustomValue3";
Please find the code snippet for accessing the custom metadata value from existing PDF document with the help of custom metadata key and namespace:
C#:
//Load the PDF document
PdfLoadedDocument ldoc = new PdfLoadedDocument("CustomMetaField.pdf");
//Get the XmlDocument from XMP metadata
XmlDocument xmlDoc = ldoc.DocumentInformation.XmpMetadata.XmlData;
//Get the XmlElement from XmlDocument
XmlElement xmlElements = xmlDoc.DocumentElement;
// Getting the custom metadata value with the help of custom metadata key
string customValue1 = GetCustomData(xmlElements, "CutomKey1");
string customValue2 = GetCustomData(xmlElements, "CutomKey2");
string customValue3 = GetCustomData(xmlElements, "CutomKey3");
//Close the document
ldoc.Close(true);
private static string GetCustomData(XmlElement xmlElem, string customMetaKey)
{
string customValue = "";
string tagName = "custom:" + customMetaKey;
// get the custom meta data value with tag name and namespace
XmlNodeList nodeList = xmlElem.GetElementsByTagName(tagName);
if(nodeList.Count>0)
customValue = (nodeList[0].InnerXml);
return customValue;
}
The sample for retrieving the custom metadata from PDF loaded document can be downloaded from the link mentioned below:
https://www.syncfusion.com/downloads/support/directtrac/general/ze/RetrieveCustomMeta673441964
I hope you enjoyed learning about how to retrieve custom metadata from exisisting PDF document.
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