Extract metadata from PDF documents
To extract metadata from PDF documents GetMetadata method is used. This method allows to extract the following metadata:
| Name | Description |
|---|---|
| title | The title of the presentation. |
| subject | The subject of the presentation. |
| keywords | The keyword of the presentation. |
| author | The name of the presentation’s author. |
| application | The name of the application. |
| application-version | The version number of the application that created the presentation. |
| created-time | The time of the presentation creation. |
| last-saved-time | The time of the the presentation when it was last saved. |
Here are the steps to extract metadata from PDF document:
- Instantiate Parser object for the initial document;
- Call GetMetadata method and obtain collection of document metadata objects;
- Iterate through the collection and get metadata names and values.
GetMetadata method returns null value if metadata extraction isn’t supported for the document. For example, metadata extraction isn’t supported for TXT files. Therefore, for TXT file GetMetadata method returns null. If PDF document has no metadata, GetMetadata method returns an empty collection.
The following example demonstrates how to extract metadata from PDF document:
// Create an instance of Parser class
using(Parser parser = new Parser(filePath))
{
// Extract metadata from the document
IEnumerable<MetadataItem> metadata = parser.GetMetadata();
// Iterate over metadata items
foreach(MetadataItem item in metadata)
{
// Print the item name and value
Console.WriteLine(string.Format("{0}: {1}", item.Name, item.Value));
}
}
More resources
GitHub examples
You may easily run the code above and see the feature in action in our GitHub examples:
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