USED LIBRARIES

Android Binary
https://github.com/barteksc/PdfiumAndroid

Windows Binary
https://github.com/bblanchon/pdfium-binaries

DEPENDENCIES

In order to view online PDF files, you have to use a HTTP Client plugin.

1- If you don't need HTTPS you can use ours.
https://github.com/FF-Projects-UE/HTTP_Client

2- If you need HTTPS, write your own client plugin or get from Github/Unreal Marketplace.
My personaly choice is Low Entry HTTP Request
https://www.unrealengine.com/marketplace/en-US/product/low-entry-http-request

TARGET PLATFORM

• Plugin is for Unreal Engine 5.1 and up.
• This is a "runtime" plugin. It won't work on editor.
• Android platform can render PDF file and get texts but it can't create new PDF file.
• Windows platform can render PDF file, get texts and create new PDF file.

FEATURES

• PDF Android Path HelperThere: It gives real absolute path of file on Android.

• Get Pages: It will give an Map of (Key: Texture2D, Value: Width and Height) pages as textures.

• Get Texts: It will get all texts of all pages.

• Select Text: You can think this as a somekind of text selection. It will get text/strings in a rectangle area.

  • You have to define that rectangle's size and location according with PDF's size and location.
  • Don't use your cursor location directly.
  • Sample math: (Cursor Location - PDF Location at screen) * Sampling (value which you used on Get Pages)

• Get Links: It will give all "weblinks" in specified page. It won't give internal bridges. It will give weblinks. This is limitation of PDFium.

• Get Pages Count: You know what it does.

• PDF Read File Close: It will close opened document.

• PDF_LibInit / PDF_LibClose / PDF_LibState: It will initialize, close and give state of PDFium library.

• Load Standart Font: There are 14 standart fonts embedded to PDF libraries according to PDF Spec 1.7 page 416. This function allows to select one them.

• Create PDF: It creates a new and empty PDF file.

• Add Pages: It adds pages to target PDF file with defined size. (Array count is page count and each vector element of array is its size)

• Add Texts: It adds text objects to target page. PDFium doesn't support line break at default but we integrated a parse system. So it has auto wrap feature. Neverthless, we suggest you that be careful about your layout (for example when will you create a line break or not)

  • Position X = Horizontal position.
  • Position Y = Vertical position but it starts from bottom. If your PDF page's height is 800 pixel, top will be 800 and bottom will be 0.
  • Shear X and Y = It strecth your text object. Scaling won't be vectoral. So we don't suggest it.
  • Rotation X and Y = We don't know how it works right now.
  • Border X and Y = It defines vertical and horizontal borders.
  • Use Charcodes: Frontend usage from blueprints are same but at backend it switches between ASCII Decimal based "FPDFText_SetCharcodes()" and "FPDFText_SetText()". Charcodes has better character support.

• Add Images: We have not finished it, yet.

• Save PDF: It save pdf file to target location.

  • IMPORTANT ! CALL THIS ONLY FROM A SINGLE PLACE ! STORE ALL YOUR CREATED PDF FILES AND WRITE THEM ALL AT ONCE ! IT USES C CALLBACK AND ITS PURPOSE IS SINGLE FILE EXPORT AT THE SAME TIME !
  • For multiple save cases, you can export all your PDF objects to different (or same) location in a for loop after you finish your job.
  • You don't have to save your PDF file when you add something to it. It automaticaly refresh it.

USAGE

• You need to use it in a C++ project. After first compile, you can copy it to a blueprint only project.
• Do NOT close PDF document unless you absolutely sure that you won't use it anymore.
• When you close your game or finish your job with that document, close that PDF document.
• When you close your game, you have to close library as well.
• if you want to "view" changes which you did on your newly created PDF file in UE5, you need to render it "again" and assign it to your widget or material.

EXPRIMENTAL (DO NOT USE THEM)

• Image Adding
• Extenal Font Loading