最近抽空把 Bluelua 计划的最后一部分功能内容做完了&＃xff0c;就是在 lua 中重载 UE4 中的网络事件&＃xff0c;这样就可以直接在 lua 中重写网络相关的逻辑了。还有就是将之前重载纯蓝图函数和事件几个崩溃修复了。网络相关的重写示例在 BlueluaDemo 的 NetTest 文件夹中
UE4 中网络事件分两种&＃xff0c;一种是 C&＃43;&＃43; 中的网络事件&＃xff0c;就是在 UFUNCTION 中带上 Server/NetMulticast/Client 关键字&＃xff0c;另一种是在蓝图中&＃xff0c;创建一个 Custom Event&＃xff0c;然后在这个事件的复制属性中选择 Run On Server/Multicast/Run on owning Client&＃xff0c;如图
这两种是互相独立的&＃xff0c;也就是 C&＃43;&＃43; 中的 Server/NetMulticast/Client 函数是无法在蓝图中进行重写&＃xff0c;所以如果有这样的需求就需要在 C&＃43;&＃43; 的 Server/NetMulticast/Client 函数中去调用其它 BlueprintNativeEvent/BlueprintImplementable 函数&＃xff0c;将这个事件抛到蓝图中&＃xff0c;略显麻烦。Bluelua 中就不用这么麻烦了&＃xff0c;现在可以直接在 lua 中分别重写这两类网络事件
首先在 ANetCharacter 的 C&＃43;&＃43; 类中定义三个函数&＃xff0c;一个可复制属性和属性的修改通知函数
UFUNCTION(Unreliable, Server, WithValidation)
void TestNativeServerFunction();UFUNCTION(Unreliable, NetMulticast)
void TestNativeNetMulticastFunction();UFUNCTION(Unreliable, Client)
void TestNativeClientFunction();UPROPERTY(ReplicatedUsing&＃61;OnRep_Counter)
int32 Counter;UFUNCTION(BlueprintNativeEvent)
void OnRep_Counter();
实现这几个函数
void ANetCharacter::TestNativeClientFunction_Implementation()
{UE_LOG(LogTemp, Display, TEXT("%sTestNativeClientFunction get called"), *GetPrefix(this));
}void ANetCharacter::TestNativeNetMulticastFunction_Implementation()
{UE_LOG(LogTemp, Display, TEXT("%sTestNativeNetMulticastFunction get called"), *GetPrefix(this));
}void ANetCharacter::TestNativeServerFunction_Implementation()
{UE_LOG(LogTemp, Display, TEXT("%sTestNativeServerFunction get called"), *GetPrefix(this));TestNativeNetMulticastFunction(); // will run on local and remoteTestNativeClientFunction(); // will run on remote
}bool ANetCharacter::TestNativeServerFunction_Validate()
{return true;
}void ANetCharacter::OnRep_Counter_Implementation()
{UE_LOG(LogTemp, Display, TEXT("%sNative OnRep_Counter: %d"), *GetPrefix(this), Counter);
}// 在服务器的 Tick 中每隔 1 秒递增 Counter
void ANetCharacter::Tick(float DeltaTime)
{Super::Tick(DeltaTime);if (Role &＃61;&＃61; ROLE_Authority){static float UpdateTime &＃61; 0;UpdateTime &＃43;&＃61; DeltaTime;if (UpdateTime > 1.f){&＃43;&＃43;Counter;UpdateTime &＃61; 0.f;}}
}
在 ANetCharacter 的子类 lua 中绑定一个 P 键输入事件&＃xff0c;按下 P 键后从客户端调用 TestNativeServerFunction/TestNativeNetMulticastFunction/TestNativeClientFunction 几个函数进行测试
function m:OnSetupPlayerInputComponent()local BlueluaLibrary &＃61; LoadClass(&＃39;BlueluaLibrary&＃39;)local EInputEvent &＃61; {IE_Pressed &＃61; 0,IE_Released &＃61; 1,IE_Repeat &＃61; 2,IE_DoubleClick &＃61; 3,IE_Axis &＃61; 4,IE_MAX &＃61; 5,}-- Press P key to start ent testBlueluaLibrary:BindKeyAction(Super, { Key &＃61; { KeyName &＃61; &＃39;P&＃39; } }, EInputEvent.IE_Pressed, true, false, CreateFunctionDelegate(Super, self, self.OnKeyPressed))
endfunction m:OnKeyPressed()-- test net event in c&＃43;&＃43;Super:TestNativeClientFunction() -- will run on current clientSuper:TestNativeNetMulticastFunction() -- will run on current clientSuper:TestNativeServerFunction() -- will run on remote server
end
在测试前需要在编辑器中勾选 Run Dedicated Server&＃xff0c;如图
在没有重写的情况下&＃xff0c;调用的是 C&＃43;&＃43; 中的实现&＃xff0c;输出的 log 为
LogTemp: Display: Client 1: Native OnRep_Counter: 1
LogTemp: Display: Client 1: Native OnRep_Counter: 2
LogTemp: Display: Client 1: Native OnRep_Counter: 3
LogTemp: Display: Client 1: Native OnRep_Counter: 4
LogTemp: Display: Client 1: Native OnRep_Counter: 5
LogTemp: Display: Client 1: Native OnRep_Counter: 6
LogTemp: Display: Client 1: Native OnRep_Counter: 7
LogTemp: Display: Client 1: TestNativeClientFunction get called
LogTemp: Display: Client 1: TestNativeNetMulticastFunction get called
LogTemp: Display: Server: TestNativeServerFunction get called
LogTemp: Display: Server: TestNativeNetMulticastFunction get called
LogTemp: Display: Client 1: TestNativeClientFunction get called
LogTemp: Display: Client 1: TestNativeNetMulticastFunction get called
LogTemp: Display: Client 1: Native OnRep_Counter: 8
LogTemp: Display: Client 1: Native OnRep_Counter: 9
LogTemp: Display: Client 1: Native OnRep_Counter: 10
从 log 中可以看出&＃xff0c;当客户端调用 Client/NetMulticast 函数时&＃xff0c;是在本地执行的&＃xff0c;当调用 Server 函数时&＃xff0c;会在服务器执行。服务器上调用 NetMulticast 函数会在服务器本地和客户端上执行&＃xff0c;调用 Client 函数会在对应的主控(Autonomous)客户端上执行
现在在 lua 中重写这些函数的实现&＃xff0c;方法就是直接声明一个同名的函数&＃xff0c;如下
-- override Server replicated event in c&＃43;&＃43;
function m:TestNativeClientFunction()print(&＃39;TestNativeClientFunction get called&＃39;)
end-- override NetMulticast replicated event in c&＃43;&＃43;
function m:TestNativeNetMulticastFunction()print(&＃39;TestNativeNetMulticastFunction get called&＃39;)
end-- override Client replicated event in c&＃43;&＃43;
function m:TestNativeServerFunction()print(&＃39;TestNativeServerFunction get called&＃39;)Super:TestNativeNetMulticastFunction() -- will run on local server and remote clientSuper:TestNativeClientFunction() -- will run on remote client
end-- override property replicated event in c&＃43;&＃43;
function m:OnRep_Counter()print(&＃39;OnRep_Counter:&＃39;, Super.Counter)
end
按 P 键进行测试&＃xff0c;得到得 log 输出为
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 1
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 2
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 3
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 4
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 5
LogBluelua: Display: Client 1: Lua log: TestNativeClientFunction get called
LogBluelua: Display: Client 1: Lua log: TestNativeNetMulticastFunction get called
LogBluelua: Display: Server: Lua log: TestNativeServerFunction get called
LogBluelua: Display: Server: Lua log: TestNativeNetMulticastFunction get called
LogBluelua: Display: Client 1: Lua log: TestNativeClientFunction get called
LogBluelua: Display: Client 1: Lua log: TestNativeNetMulticastFunction get called
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 6
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 7
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 8
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 9
LogBluelua: Display: Client 1: Lua log: OnRep_Counter: 10
从 log 中可以看出&＃xff0c;所有的网络事件都正确调到 lua 中重写的实现中了&＃xff0c;并且执行一致
同样在 NetCharacter 蓝图中创建三个 Custom Event&＃xff0c;并分别选择 Run On Server/Multicast/Run on owning Client。创建一个 BPCounter 属性&＃xff0c;选择 RepNotify&＃xff0c;之后蓝图中会自动创建一个函数 OnRep_BPCounter&＃xff0c;在这些函数中分别打印一句 log&＃xff0c;如图
同样在 lua 的按键事件中调用这三个网络事件
function m:OnKeyPressed()-- test net event in c&＃43;&＃43;--Super:TestNativeClientFunction() -- will run on current client--Super:TestNativeNetMulticastFunction() -- will run on current client--Super:TestNativeServerFunction() -- will run on remote server-- test net event in blueprintSuper:TestBPClientFunction() -- will run on current clientSuper:TestBPNetMulticastFunction() -- will run on current clientSuper:TestBPServerFunction() -- will run on remote server
end
在 lua 没有重载的情况下的 log 输出为
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 1
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 1
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 2
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 2
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 3
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 3
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 4
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 4
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 5
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 5
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: TestBPClientFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: TestBPNetMulticastFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Server: TestBPServerFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Server: TestBPNetMulticastFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: TestBPClientFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: TestBPNetMulticastFunction get called
LogBlueprintUserMessages: [NetCharacter_C_0] Server: BP OnRep_BPCounter: 6
LogBlueprintUserMessages: [NetCharacter_C_0] Client 1: BP OnRep_BPCounter: 6
从 log 中可以看出&＃xff0c;蓝图的 Run On Server/Multicast/Run on owning Client 事件和 C&＃43;&＃43; 的 Server/NetMulticast/Client 函数的执行规则是一致的&＃xff0c;唯一的区别是可复制属性的 RepNotify 和 ReplicatedUsing&＃xff0c;RepNotify 会在服务器本地也调用 OnRep_BPCounter 函数&＃xff0c;而 ReplicatedUsing 不会&＃xff0c;这一点需要注意
现在在 lua 中重写这些事件&＃xff0c;同样只要声明一个同名的函数就行了&＃xff0c;如下
-- override Server replicated event in blueprint
function m:TestBPClientFunction()print(&＃39;TestBPClientFunction get called&＃39;)
end-- override NetMulticast replicated event in blueprint
function m:TestBPNetMulticastFunction()print(&＃39;TestBPNetMulticastFunction get called&＃39;)
end-- override Client replicated event in blueprint
function m:TestBPServerFunction()print(&＃39;TestBPServerFunction get called&＃39;)Super:TestBPNetMulticastFunction() -- will run on local server and remote clientSuper:TestBPClientFunction() -- will run on remote client
end-- override property replicated event in blueprint
function m:OnRep_BPCounter()print(&＃39;OnRep_BPCounter:&＃39;, Super.BPCounter)
end
重新按 P 键进行测试&＃xff0c;得到得 log 输出为
LogBluelua: Display: Server: Lua log: OnRep_BPCounter: 1
LogBluelua: Display: Client 1: Lua log: OnRep_BPCounter: 1
LogBluelua: Display: Server: Lua log: OnRep_BPCounter: 2
LogBluelua: Display: Client 1: Lua log: OnRep_BPCounter: 2
LogBluelua: Display: Server: Lua log: OnRep_BPCounter: 3
LogBluelua: Display: Client 1: Lua log: OnRep_BPCounter: 3
LogBluelua: Display: Server: Lua log: OnRep_BPCounter: 4
LogBluelua: Display: Client 1: Lua log: OnRep_BPCounter: 4
LogBluelua: Display: Server: Lua log: OnRep_BPCounter: 5
LogBluelua: Display: Client 1: Lua log: OnRep_BPCounter: 5
LogBluelua: Display: Client 1: Lua log: TestBPClientFunction get called
LogBluelua: Display: Client 1: Lua log: TestBPNetMulticastFunction get called
LogBluelua: Display: Server: Lua log: TestBPServerFunction get called
LogBluelua: Display: Server: Lua log: TestBPNetMulticastFunction get called
LogBluelua: Display: Client 1: Lua log: TestBPClientFunction get called
LogBluelua: Display: Client 1: Lua log: TestBPNetMulticastFunction get called
可以看出&＃xff0c;蓝图的网络事件也调到了 lua 中了&＃xff0c;并且执行规则一致
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