Throw exceptions if trying to use client interfaces with no client

Facepunch.Steamworks/SteamClient.cs

@@ -200,5 +200,14 @@ namespace Steamworks
 			return SteamAPI.RestartAppIfNecessary( appid );
 		}
 
+		/// <summary>
+		/// Called in interfaces that rely on this being initialized
+		/// </summary>
+		internal static void ValidCheck()
+		{
+			if ( !IsValid )
+				throw new System.Exception( "SteamClient isn't initialized" );
+		}
+
 	}
 }

Facepunch.Steamworks/SteamFriends.cs

@@ -17,6 +17,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamFriends();

Facepunch.Steamworks/SteamInput.cs

@@ -12,6 +12,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamInput();

Facepunch.Steamworks/SteamMatchmaking.cs

@@ -24,6 +24,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamMatchmaking();

Facepunch.Steamworks/SteamMusic.cs

@@ -20,6 +20,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamMusic();

Facepunch.Steamworks/SteamParental.cs

@@ -17,6 +17,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamParentalSettings();

Facepunch.Steamworks/SteamScreenshots.cs

@@ -17,6 +17,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamScreenshots();

Facepunch.Steamworks/SteamUser.cs

@@ -20,6 +20,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamUser();

Facepunch.Steamworks/SteamUserStats.cs

@@ -14,6 +14,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamUserStats();

Facepunch.Steamworks/SteamVideo.cs

@@ -17,6 +17,8 @@ namespace Steamworks
 		{
 			get
 			{
+				SteamClient.ValidCheck();
+
 				if ( _internal == null )
 				{
 					_internal = new ISteamVideo();