# Creating Plugin with .lib and .dll **URL:** \ **Category:** Plugins\ **Tags:** unreal-engine, dll-missing, Plugins, UE4, question\ **Created:** [May 14, 2019, 3:28pm UTC](https://forums.unrealengine.com/t/creating-plugin-with-lib-and-dll/448742 "2019-05-14T15:28:26Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Fayre333](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fayre333](https://forums.unrealengine.com/u/Fayre333)\ **Post date:** [May 14, 2019, 3:28pm UTC](https://forums.unrealengine.com/t/creating-plugin-with-lib-and-dll/448742/1 "2019-05-14T15:28:26Z")
Hey there, I’m trying to create a plugin that uses some third party libraries. I followed this tutorial to set my plugin up: [Unreal Engine: Including a Third-Party Library (on the example of the Point Cloud Library and Boost) [Tutorial] [Download] – Valentin Kraft's Portfolio](http://www.valentinkraft.de/including-the-point-cloud-library-into-unreal-tutorial/) Unfortunately, I get the following error: > error C4273: “rsb::getFactory”: > Inconsistent dll linkage. I placed my dlls in all possible folders. The plugins Binaries, the projects Binaries, and so on… but the error won’t dissapear. I linked all my .lib files as described in the tutorial and I think they can be found because I don’t get any errors with them. I added the module in my plugins .Build.cs like this: ``` using UnrealBuildTool; public class RSBInterface : ModuleRules { public RSBInterface(ReadOnlyTargetRules Target) : base(Target) { PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs; PublicIncludePaths.AddRange( new string[] { // ... add public include paths required here ... //"RSBInterface/Public" } ); PrivateIncludePaths.AddRange( new string[] { // ... add other private include paths required here ... "RSBInterface/Private", "RSBInterface/Public" } ); PublicDependencyModuleNames.AddRange( new string[] { "Core", // ... add other public dependencies that you statically link with here ... "RSBModule" } ); PrivateDependencyModuleNames.AddRange( new string[] { "CoreUObject", "Engine", "Slate", "SlateCore" // ... add private dependencies that you statically link with here ... } ); DynamicallyLoadedModuleNames.AddRange( new string[] { // ... add any modules that your module loads dynamically here ... } ); // Since the PCL module needs this, we also have to use these flags here bUseRTTI = true; bEnableExceptions = true; //bEnableUndefinedIdentifierWarnings = false; } } ``` And in my modules .Build.cs I included all the libs like this: ``` using System.IO; using System; using UnrealBuildTool; public class RSBModule : ModuleRules { private string ModulePath { get { return ModuleDirectory; } } private string BinariesPath { get { return Path.GetFullPath(Path.Combine(ModulePath, "../Binaries/")); } } public RSBModule(ReadOnlyTargetRules Target) : base(Target) { // Tell Unreal that this Module only imports Third-Party-Assets Type = ModuleType.External; LoadRSBModule(Target); } public bool LoadRSBModule(ReadOnlyTargetRules Target) { bool isLibrarySupported = false; //bool bDebug = (Target.Configuration == UnrealTargetConfiguration.Debug && BuildConfiguration.bDebugBuildsActuallyUseDebugCRT); if (Target.Platform == UnrealTargetPlatform.Win64) { isLibrarySupported = true; string LibrariesPath = Path.Combine(ModulePath, "lib64"); //string PlatformString = (Target.Platform == UnrealTargetPlatform.Win64) ? "x64" : "x86"; Console.WriteLine("... LibrariesPath -> " + LibrariesPath); Console.WriteLine("Test -> " + Path.Combine(LibrariesPath, "testfile")); // Explicitly name the used libraries PublicAdditionalLibraries.Add(Path.Combine(LibrariesPath, "boost_atomic-vc141-mt-1_65_1" + ".lib")); PublicAdditionalLibraries.Add(Path.Combine(LibrariesPath, "boost_atomic-vc141-mt-gd-1_65_1" + ".lib")); PublicAdditionalLibraries.Add(Path.Combine(LibrariesPath, "boost_chrono-vc141-mt-1_65_1" + ".lib")); PublicAdditionalLibraries.Add(Path.Combine(LibrariesPath, "boost_chrono-vc141-mt-gd-1_65_1" + ".lib")); ... [more libs] } if (isLibrarySupported) { PublicIncludePaths.Add(Path.Combine(ModulePath, "include")); Console.WriteLine("... IndlucePath -> " + Path.Combine(ModulePath, "include")); // Not sure if needed PublicDefinitions.Add("_CRT_SECURE_NO_WARNINGS=1"); PublicDefinitions.Add("BOOST_DISABLE_ABI_HEADERS=1"); // Needed configurations in order to run Boost bUseRTTI = true; bEnableExceptions = true; //bEnableUndefinedIdentifierWarnings = false; } PublicDefinitions.Add(string.Format("WITH_RSB_BINDING={0}", isLibrarySupported ? 1 : 0)); PublicDefinitions.Add(string.Format("WITH_BOOST_BINDING={0}", isLibrarySupported ? 1 : 0)); return isLibrarySupported; } } ``` Is there anything I or the tutorial is missing? ---
**Author:** ![Fayre333](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fayre333](https://forums.unrealengine.com/u/Fayre333)\ **Post date:** [May 15, 2019, 11:39am UTC](https://forums.unrealengine.com/t/creating-plugin-with-lib-and-dll/448742/2 "2019-05-15T11:39:48Z")
UPDATE: I have no idea if I’m right about that but I found out that usually the C4273 dll linkage error is a warning and that Unreal sometimes treats warning as errors. I can suppress this with `#pragma warning(disable: 4273)` but I don’t know if this is smart. However, when I try to compile with the error supressed, I get this error: ``` LINK : fatal error LNK1104: can not open file "xxxxx.lib" ``` I don’t know if there is something wrong with the path to this file, but I think not (I’m printing the include path and it is right). Does anyone have any experiences with this? I don’t really know where to look for answers… ---
**Author:** ![DebashishPatra](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DebashishPatra](https://forums.unrealengine.com/u/DebashishPatra)\ **Post date:** [May 18, 2019, 6:48am UTC](https://forums.unrealengine.com/t/creating-plugin-with-lib-and-dll/448742/3 "2019-05-18T06:48:34Z")
Okay, lets break this down. There are following ways to implement dll/lib paired files. 1. DLL **with** LIB. - Engine statically links to all functions - You have to use UBT to set things up - Your libraries are not exposed to end user - Linking is mendatory. Any missing references will throw error. 1. DLL **without** LIB - Your code has function pointers - You have to use manually set things up - Your libraries are exposed to end user - Linking is optional. Any missing references will just continue the operation. So, which one are planning to use ? ---
**Author:** ![Fayre333](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Fayre333](https://forums.unrealengine.com/u/Fayre333)\ **Post date:** [May 19, 2019, 10:18am UTC](https://forums.unrealengine.com/t/creating-plugin-with-lib-and-dll/448742/4 "2019-05-19T10:18:52Z")
Thanks for your answer! I guess I have to go for the first way. The library I want to use in my plugin consists of libs, dlls and header files. If I am correct, I want to include the header files that are then using functions from the dll and lib files. I have found the following for linking dlls: ``` PublicDelayLoadDLLs.Add("XXXX.dll"); ``` And that you can do something like this in your plugin’s cpp file: ``` DLLHandle = FPlatformProcess::GetDllHandle(*filePath); ``` But even with the `PublicDelayLoadDLLs` I am still getting this error. And since the `DllHandle` is in my cpp file and will be called in the `ModuleStartup` method I don’t think that this would solve my compile error. Am I right with this?