How to properly integrate libraries into Unreal?

Development Programming & Scripting C++
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Look at build.cs and upl.xml (be careful about their includes, too)

  1. Create a C++project.

  2. Create a Plugin from Plugins tab.

  3. Add your includes and libraries to your build.cs like sample plugin.

  4. If your library is static, you are ready. Just right click your .uproject and select Generate Visual Studio Project Files. After that, you can use include "your_third_party.h"

  5. If your library is dynamic, you have two extra steps for each platform of you supported.

For Windows:

  1. Create a void* function in your Plugin_Name.h like this sample
    PDF_Reader/PDF_Reader.h at main · FF-Projects-UE/PDF_Reader · GitHub

  2. Write a delayed load in your startup module like this.
    PDF_Reader/PDF_Reader.cpp at main · FF-Projects-UE/PDF_Reader · GitHub

For Android and iOS:

  1. Add your .so files like UPL.xml (you can see it at first link)
    You have to create seperate UPL.xml if you want to support both iOS and Android. If your library is static, you don’t need to create one and add it to your build.cs
    UPL is same for both mobile platform but probably directory structure is different. I don’t have Apple exprience and Apple devices. So, I can’t tell true paths.

As I know Mac doesn’t support delayed loads and they doesn’t support .dll. They have their own dynamic library extension. Build.cs structure will be same. Just add them inside of platform if. If they need another step, I don’t know.