Font Extraction

This guide will show you how to use the extractor package to extract font(s) from a specific page in a PDF and save the output font(s) to a zip archive.

Sample input #

Before you begin #

You should get your API key from your UniCloud account.

If this is your first time using UniPDF SDK, follow this guide to set up a local development environment.

Project setup #

Clone the project repository #

In your terminal, clone the examples repository. It contains the Go code we will be using for this example.

git clone https://github.com/unidoc/unipdf-examples.git

Navigate to the extract folder in the unipdf-examples directory.

cd unipdf-examples/extract

Configure environment variables #

Replace the UNIDOC_LICENSE_API_KEY with your API credentials from your UniCloud account.

Linux/Mac #

export UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

Windows #

set UNIDOC_LICENSE_API_KEY=PUT_YOUR_API_KEY_HERE

How it works #

Lines 3-12 import the UniPDF packages and other required dependencies.

Lines 14-21 authenticate your request with your UNIDOC_LICENSE_API_KEY with the init function.

The main function in lines 22-52 validates your input and passes it as arguments to the extractFontToArchive function.

Lines 55-131 define the extractFontToArchive function, accepting the inputPath, outpathPath, and pageNumber as arguments. The extractor package extracts the font(s) for the specified page in the input PDF, saves the fonts in the output path as a zip archive, and prints the font properties to the terminal.

Run the code #

Run this command to extract text from each page in the PDF. This will also get all the required dependencies to run the program.

# setting page number to 0 extract the fonts for all the pages in the PDF.
# extracting fonts for page 4
go run pdf_extract_fonts.go input.pdf <pagenumber> output.zip 

Sample output #

You will get the font(s) for the specified page in the PDF as a zip archive. Unzip the file to see its content.