Foxit Quick PDF Library

Check to see if PDF is compressed

by Conor | October 8, 2013
There isn’t an easy way to check if a PDF contains compressed elements or not. There is not a PDF wide compression option, instead various different objects and streams in PDF files can be compressed individually, using different compression methods. So if you wanted to determine if a PDF contained any compression at all you […]
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Digital signature not visible on page after signing PDF

by Conor | October 8, 2013
When you use the SignFile function to add a digital signature to a PDF it adds an invisible digital signature which is not shown on any of the pages in the document. Instead the digital signature can be viewed by opening the PDF in Adobe Reader, Adobe Acrobat or another PDF editing application, and clicking […]
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Advanced options for signing PDF files

by Conor | October 2, 2013
The SignFile function in Foxit Quick PDF Library lets you sign PDF files using the PKCS#12 format (containing a certificate and private key). But sometimes more advanced signing options are required. This is why we’ve added two new functions: SetSignProcessPassthrough and GetSignProcessByteRange. These functions let you sign PDF files using signatures that were created externally. These […]
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Programmatically extract form field data from PDF files

by Conor | September 18, 2013
As well as enabling you to generate form fields and fill form fields, Foxit Quick PDF Library makes it easy to extract form field data or information about form fields from PDF files. In the sample code below we demonstrate how to iterate through each page in a PDF to extract information about all of […]
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Appearance streams for PDF form fields

by Conor | September 17, 2013
A form field must have an appearance stream associated with it in the PDF in order for the form field to be visible when the PDF is viewed or printed. Appearance streams control the appearance of widget annotations and allow them to be presented in visually different ways to reflect user interactions. When creating form […]
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Create PDF form fields programmatically

by Conor | September 17, 2013
Creating PDF forms programmatically is easy with Foxit Quick PDF Library. In the sample code below we show you how to create text, checkbox and radio button form fields. A list of all form field functions available in our PDF SDK can be found in our form field function reference. PDF form fields need appearance […]
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