This does not work

1>D:\UEP4.16\Unreal Projects\testSpark\Plugins\GameSparks\Source\GameSparks\GameSparks.Build.cs : warning : Module constructors should take a ReadOnlyTargetRules argument (rather than a TargetInfo argument) and pass it to the base class constructor from 4.15 onwards. Please update the method signature.
1>D:\UEP4.16\Unreal Projects\testSpark\Plugins\GameSparks\Source\OnlineSubsystemGameSparks\OnlineSubsystemGameSparks.Build.cs : warning : Module constructors should take a ReadOnlyTargetRules argument (rather than a TargetInfo argument) and pass it to the base class constructor from 4.15 onwards. Please update the method signature.
1>  Performing full C++ include scan (no include cache file)
1>EXEC : warning : Plugin 'GameSparks' does not list plugin 'OnlineSubsystemUtils' as a dependency, but module 'GameSparks' depends on 'OnlineSubsystemUtils'.
1>EXEC : warning : Plugin 'GameSparks' does not list plugin 'OnlineSubsystem' as a dependency, but module 'GameSparks' depends on 'OnlineSubsystem'.
1>EXEC : warning : Plugin 'GameSparks' does not list plugin 'OnlineSubsystem' as a dependency, but module 'OnlineSubsystemGameSparks' depends on 'OnlineSubsystem'.
1>  Parsing headers for testSparkEditor
1>    Running UnrealHeaderTool "D:\UEP4.16\Unreal Projects\testSpark\testSpark.uproject" "D:\UEP4.16\Unreal Projects\testSpark\Intermediate\Build\Win64\testSparkEditor\Development\testSparkEditor.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
1>  Reflection code generated for testSparkEditor in 12,5527531 seconds
1>  Performing 20 actions (4 in parallel)
1>  [2/20] Resource ModuleVersionResource.rc.inl
1>  [4/20] Resource PCLaunch.rc
1>  [3/20] Resource PCLaunch.rc
1>  [5/20] Resource PCLaunch.rc
1>cl : Command line warning D9002: ignoring unknown option '/source-charset:utf-8'
1>cl : Command line warning D9002: ignoring unknown option '/execution-charset:utf-8'
1>  SharedPCH.Engine.cpp
1>d:\program files\ue_4.17\engine\source\runtime\core\public\Windows/WindowsPlatformCompilerSetup.h(19): error C2338: Visual Studio 2015 Update 3 is required to compile on Windows (http://go.microsoft.com/fwlink/?LinkId=691129)
1>ERROR : UBT error : Failed to produce item: D:\UEP4.16\Unreal Projects\testSpark\Plugins\GameSparks\Intermediate\Build\Win64\UE4Editor\Development\UE4Editor-GameSparks.lib
1>  Total build time: 37,75 seconds (Local executor: 0,00 seconds)
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(42,5): error MSB3073: The command ""D:\Program Files\UE_4.17\Engine\Build\BatchFiles\Rebuild.bat" testSparkEditor Win64 Development "D:\UEP4.16\Unreal Projects\testSpark\testSpark.uproject" -waitmutex" exited with code -1.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========

Okay, could you pleeeeaase make sure that these Plugins are properly setup before submitting them to UE4?

1. 4.17 (as an example) requires this in the UPLUGIN file:

  "Plugins": [
		{
			"Name": "OnlineSubsystem",
			"Enabled": true
		},
		{
			"Name": "OnlineSubsystemUtils",
			"Enabled": true
		},
	]

 You put that right behind the "Modules" entry, don't forget the comma.
That's the warning the person above me has (the 3 rows saysing that OnlineSubsystem etc is not listed).


2. Thanks a lot for putting up a UObject instead of the Component, but please, who just copy pasted the UCLASS specifiers?

UCLASS(ClassGroup=(GameSparks), meta = (BlueprintSpawnableComponent))

 That's simply wrong for a UObject!

UCLASS(Blueprintable, BlueprintType)

 You need this, as this makes it able to be Spawned and also saved in a variable.

3. You still need to expose the Message Listener the same way. It's a component atm.

Also, UGamesparksComponent does not need to derive from USceneComponent. UActorComponent is enough since it does not need to be physically attached to the scene.

Moreover, I often get this error: Trying to recreate class 'UGameSparksComponent' outside of hot reload!

Which causes me to clean and rebuild the project, which is not the fastest way to develop :/

Last thing: for an unknown reason, even when I don't update the files of the gamesparks plugin, the DLL is always recompiled. It does not happen with some other plugins we use in our solution. And I suspect this is what caused the above error.