Every PDF document has some Meta Information like Title, Author Name, Creation Date etc. Aspose.Pdf.Kit (Java Version ) allows developers to control this meta information.

 

To change meta information of the PDF documents, we use PdfFileInfo (Java Version ) class by calling its constructor that takes the input PDF file name as string argument. Then developers can modify the meta information through properties ( Title (Java Version ) Author (Java Version ) CreationDate (Java Version ) Creator (Java Version ) Keywords (Java Version ) ModDate (Java Version ) Producer (Java Version ) Header (Java Version ) NumberOfPages (Java Version ) and Subject (Java Version ) ) of PdfFileInfo (Java Version ) class.

 

Once the meta information is modified, don't forget to call SaveNewInfo (saveNewInfo in Java Version ) method to save the changes to meta information of PDF document.

 

Code Snippet

 

[C#]

 

//Variable to hold input PDF file name and path

string inFile = ".\\example.pdf";

 

//Variable to hold output PDF file name and path

string outFile = ".\\output.pdf";

 

//Instantiating PdfFileInfo object and passing input PDF file to its constructor

PdfFileInfo fileInfo = new PdfFileInfo(inFile);

 

//Instantiating a Hashtable object

System.Collections.Hashtable additionalInfo = new System.Collections.Hashtable();

 

//Adding comment in Hashtable object used as header of PDF document

additionalInfo.Add("Comment","terrorism challenges the peace of world.");

 

//Change the Title of the input PDF file

fileInfo.Title = "Hello World!";

 

//Change the Author of the input PDF file

fileInfo.Author = "William";

 

//Change the Creator of the input PDF file

fileInfo.Creator = "Aspose";

 

//Change the Keywords of the input PDF file

fileInfo.Keywords = "peace and development";

 

//Change the Header of the input PDF file by assigning the above Hashtable object

fileInfo.Header = additionalInfo;

 

//Call SaveNewInfo method to change the properties specified explicitly

fileInfo.SaveNewInfo(outFile);

 

[VB.NET]

 

'Variable to hold input PDF file name and path

Dim inFile As String =  ".\\example1.pdf"

 

'Variable to hold output PDF file name and path

Dim outFile As String =  ".\\output.pdf"

 

'Instantiating PdfFileInfo object and passing input PDF file to its constructor

Dim fileInfo As PdfFileInfo =  New PdfFileInfo(inFile)

 

'Instantiating a Hashtable object

Dim additionalInfo As System.Collections.Hashtable =  New System.Collections.Hashtable()

 

'Adding comment in Hashtable object used as header of PDF document

additionalInfo.Add("Comment","terrorism challenges the peace of world.")

 

'Change the Title of the input PDF file

fileInfo.Title = "Hello World!"

 

'Change the Author of the input PDF file

fileInfo.Author = "William"

 

'Change the Creator of the input PDF file

fileInfo.Creator = "Aspose"

 

'Change the Keywords of the input PDF file

fileInfo.Keywords = "peace and development"

 

'Change the Header of the input PDF file by assigning the above Hashtable object

fileInfo.Header = additionalInfo

 

'Call SaveNewInfo method to change the properties specified explicitly

fileInfo.SaveNewInfo(outFile)

 

[Java]

 

String path = "./examples/resources/";

String inFile = path + "example1.pdf";

String outFile = path + "PdfInfoOut1.pdf";

HashMap header = new HashMap();

 

header.put("Zone", "+800");

PdfFileInfo fileInfo = null;

 

fileInfo = new PdfFileInfo(inFile);

 

fileInfo.setAuthor("William");

fileInfo.setTitle("Hello");

fileInfo.setSubject("Peace");

fileInfo.setKeywords("A,B");

fileInfo.setHeader(null);

fileInfo.saveNewInfo(outFile);