Problem with linking and using third party libraries in c++

Development Programming & Scripting C++
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1

Hello! I’m fairly new to Unreal engine and I wanted to read yaml files in my project using c++, so i tried to link the yaml-cpp library which didn’t work.

Before i even tried to link the yaml-cpp library, I have followed this tutorial for linking static library and everything worked fine.
I then tried to replicate the same process using the yaml-cpp library and the project then didn’t compile. I’ve got the “cannot open file yaml.h” during compilation if i include the header anywhere in the code. Or i got a lot of linker errors.

Here is the .build.cs file of the project


using UnrealBuildTool;
using System.IO;

public class Cooking_Game : ModuleRules
{
	private string ModulePath
    {
        get { return ModuleDirectory; }
    }

    private string ThirdPartyPath
    {
        get { return Path.GetFullPath( Path.Combine( ModulePath, "../../ThirdParty/" ) ); }
    }

	public Cooking_Game(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;

		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject",  "Engine", "InputCore" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });

		LoadYamlCpp(Target);
	}

	public bool LoadYamlCpp(ReadOnlyTargetRules Target) 
	{
		bool isLibrarySupported = false;

		if (Target.Platform == UnrealTargetPlatform.Win64)
		{
			isLibrarySupported = true;

			string PlatformString = (Target.Platform == UnrealTargetPlatform.Win64) ? "x64" : "x86";
			string LibrariesPath = Path.Combine(ThirdPartyPath, "yaml-cpp", "lib");

			PublicAdditionalLibraries.Add(Path.Combine(LibrariesPath, "yaml-cpp." + PlatformString + ".lib"));
		}
		if (isLibrarySupported)
		{
		
			PublicIncludePaths.Add(Path.Combine(ThirdPartyPath, "yaml-cpp", "include"));
		}

		return isLibrarySupported;
	}
}

First i got this error (sorry that it is not fully english): fatal error C1083: Nejde otev? soubor zahrnout: yaml.h: No such file or directory

But trying to redo everything from scratch i got bunch of linker errors, mostly unrecognized external symbol. you can see here

Files in ThirdParty folder:
yaml-cpp
└include
**└yaml-cpp
****└other headers
**** └ yaml.h
└lib
** └ yamp-cpp.x64.lib

Code using the yaml library:

#include "TestFunctionLibrary.h"
#include "yaml-cpp/yaml.h"


int UTestFunctionLibrary::TestFunc() {
	return 5;
}

float UTestFunctionLibrary::YAMLtest() {
    //Load the YAML file
    YAML::Node config = YAML::LoadFile("example.yaml");

    //Access data from the YAML file
    float version = config["version"].as<float>();

    return version;
}

Does anyone know what is wrong or what can i do to fix this? I have tried to search the internet for three whole days now, but i cannot find a solution. I’m also open to different solutions like diferent libraries or aproaches, if that will allow me to work with yaml files. I would be grateful for any kind of help :slight_smile: