unreal engine c++ 创建tcp server， tcp client

TCP客户端

TcpConnect.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Common/UdpSocketReceiver.h"
#include "GameFramework/Actor.h"

DECLARE_DELEGATE_TwoParams(FOnServerResponseReceived, const int32&, bool);

class FTcpConnect : public FRunnable
{
public:
	// Sets default values for this actor's properties
	FTcpConnect();

	virtual ~FTcpConnect()
	{
		if (ReceiveThread != nullptr)
		{
			ReceiveThread->Kill(true);
			delete ReceiveThread;
		}
	}
	// virtual FSingleThreadRunnable* GetSingleThreadInterface() override
	// {
	// 	return this;
	// }
public:
	// Called every frame

	void ConnectToServer(FString ServerAddress, const int32 ServerPort);
	void SendMessage(const FString& Message);

	FOnServerResponseReceived& OnDataReceived()
	{
		return OnServerResponseReceived;
	}

	virtual bool Init() override;
	virtual void Stop() override;

protected:


	virtual uint32 Run() override;

	virtual void Exit() override;


private:
	FSocket* Socket;
	TSharedPtr<FInternetAddr> RemoteAddr;
	FIPv4Endpoint LocalEndpoint;
	TArray<uint8> ReceivedData;
	FUdpSocketReceiver* UDPReceiver;
	bool bIsReceiving;
	FRunnableThread* ReceiveThread;
	int64 StartMs;

	FOnServerResponseReceived OnServerResponseReceived;
};

TcpConnect.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "Subsystem/TcpConnect.h"

// Sets default values
FTcpConnect::FTcpConnect()
{
}


void FTcpConnect::ConnectToServer(FString ServerAddress, const int32 ServerPort)
{
	// 
	Socket = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->CreateSocket(NAME_Stream, TEXT("default"), false);

	// 
	RemoteAddr = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->CreateInternetAddr();
	bool bValid;
	RemoteAddr->SetIp(*ServerAddress, bValid);
	RemoteAddr->SetPort(ServerPort);
	if (Socket->Connect(*RemoteAddr))
	{
		UE_LOG(LogTemp, Display, TEXT("Connected to server"));

		// 
		bIsReceiving = true;
		ReceiveThread = FRunnableThread::Create(this, TEXT("ReceiveThread"), 128 * 1024);
	}
	else
	{
		UE_LOG(LogTemp, Error, TEXT("Failed to connect to server"));
	}
}

void FTcpConnect::SendMessage(const FString& Message)
{
	if (Socket)
	{
		const TCHAR* MessageData = *Message;
		int32 BytesSent = 0;
		StartMs = FDateTime::Now().ToUnixTimestamp() * 1000.0 + FDateTime::Now().GetMillisecond();
		UE_LOG(LogTemp, Warning, TEXT(" start ms %d"), StartMs);
		Socket->Send((uint8*)TCHAR_TO_UTF8(MessageData), FCString::Strlen(MessageData), BytesSent);
	}
}

// FOnServerResponseReceived& FTcpConnect::OnDataReceived()
//
// {
// 	// check(ReceiveThread == nullptr);
// 	return OnServerResponseReceived;
// }


bool FTcpConnect::Init()
{
	if (ReceiveThread && Socket)
	{
		return true;
	}
	return false;
}

void FTcpConnect::Stop()
{
	bIsReceiving = false;

	if (ReceiveThread)
	{
		ReceiveThread->WaitForCompletion();
		// ReceiveThread.re
	}

	if (Socket)
	{
		Socket->Close();
		Socket = nullptr;
		// Socket.Reset();
	}
}

uint32 FTcpConnect::Run()
{
	while (bIsReceiving)
	{
		uint8 Data[1024];
		int32 BytesReceived = 0;
		if (Socket->Recv(Data, sizeof(Data), BytesReceived, ESocketReceiveFlags::None))
		{
			if (BytesReceived > 0)
			{
				FString Message = FString(UTF8_TO_TCHAR((const char*)Data));
				UE_LOG(LogTemp, Warning, TEXT(" message %s"), *Message)

				int64 EndMs = FDateTime::Now().ToUnixTimestamp() * 1000.0 + FDateTime::Now().GetMillisecond();
				UE_LOG(LogTemp, Warning, TEXT(" start ms %d  %d"), EndMs, EndMs- StartMs);
				auto r = OnServerResponseReceived.ExecuteIfBound(EndMs - StartMs, true);
				bIsReceiving = false;
			}
		}
		FPlatformProcess::Sleep(0.05f);
	}

	return 0;
}

void FTcpConnect::Exit()
{
	// FRunnable::Exit();
}

tcp server

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "HAL/Runnable.h"

class FSocket;
class FInternetAddr;

/**
 * 
 */
class MYPROJECT2_API FTcpServer : public FRunnable
{
public:
	FTcpServer();
	~FTcpServer();
	
	// 初始化服务器
	virtual bool Init() override;

	// 开始监听连接
	bool StartListening(FString IpAddress, int32 Port);

	// 停止监听连接
	void StopListening();

	// FRunnable 接口
	virtual uint32 Run() override;
	virtual void Stop() override;
	void HandleTextMessage(const FString& Message);

private:
	// 处理客户端连接
	void HandleConnection(FSocket* NewClientSocket, const TSharedRef<FInternetAddr>& ClientAddress);
	FString StringFromBinaryArray(const TArray<uint8>& BinaryArray);

	class FSocket* serverSocket;
	FSocket* ListenSocket;
	FRunnableThread* ServerThread;
	FThreadSafeBool bIsStopping;

	TMap<FSocket*, FString> ClientDataMap; // 用于存储每个客户端的数据

};

cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "Net/TcpServer.h"

#include "Common/TcpSocketBuilder.h"
#include "Interfaces/IPv4/IPv4Endpoint.h"

FTcpServer::FTcpServer() : ListenSocket(nullptr), ServerThread(nullptr), bIsStopping(false)
{
	ServerThread = FRunnableThread::Create(this, TEXT("TcpServerThread"));
}

FTcpServer::~FTcpServer()
{
	StopListening();
}


bool FTcpServer::Init()
{
	// 初始化网络模块
	// if (!ISocketSubsystem::Init())
	// {
	// 	UE_LOG(LogTemp, Error, TEXT("Failed to initialize socket subsystem."));
	// 	return false;
	// }

	return true;
}

bool FTcpServer::StartListening(FString IpAddress, int32 Port)
{
	FString ServerIP = IpAddress;
	FIPv4Address ServerAddr;
	if (!FIPv4Address::Parse(ServerIP, ServerAddr))
	{
		UE_LOG(LogTemp, Error, TEXT("Server Ip %s is illegal"), *ServerIP);
	}
	ListenSocket = FTcpSocketBuilder(TEXT("Socket Listener"))
	               .AsReusable()
	               .AsBlocking()
	               .BoundToAddress(ServerAddr)
	               .BoundToPort(Port)
	               .Listening(8)
	               .WithReceiveBufferSize(1024)
	               .WithSendBufferSize(1024);
	if (ListenSocket)
	{
		UE_LOG(LogTemp, Warning, TEXT("Server Create Success!"), *ServerIP);
		// SocketCreateDelegate.Broadcast(true);
		// GetWorld()->GetTimerManager().SetTimer(ConnectCheckHandler, this, &ATCPServer::ConnectCheck, 1, true);
		return false;
	}
	else
	{
		UE_LOG(LogTemp, Error, TEXT("Server Create Failed!"));
		// SocketCreateDelegate.Broadcast(false);
	}
	return false;
}

void FTcpServer::StopListening()
{
	if (ListenSocket)
	{
		ListenSocket->Close();
		ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->DestroySocket(ListenSocket);
		ListenSocket = nullptr;
	}

	if (ServerThread)
	{
		ServerThread->WaitForCompletion();
		delete ServerThread;
		ServerThread = nullptr;
	}
}

uint32 FTcpServer::Run()
{
	ISocketSubsystem* SocketSubsystem = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM);
	if (!SocketSubsystem)
	{
		UE_LOG(LogTemp, Error, TEXT("Socket subsystem not available."));
		return 1;
	}
	
	while (!bIsStopping)
	{
		if (!ListenSocket) continue;

		TSharedRef<FInternetAddr> ClientAddress = ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->CreateInternetAddr();
		FSocket* NewClientSocket = ListenSocket->Accept(*ClientAddress, TEXT("MyTcpServer Connection"));
		UE_LOG(LogTemp, Log, TEXT("Run"));

		if (NewClientSocket)
		{
			// 新客户端连接处理
			HandleConnection(NewClientSocket, ClientAddress);
			
		}
		FPlatformProcess::Sleep(0.01);
	}

	return 0;
}

void FTcpServer::Stop()
{
	UE_LOG(LogTemp, Warning, TEXT("St opped"));

	bIsStopping = true;
}

void FTcpServer::HandleTextMessage(const FString& Message)
{
	UE_LOG(LogTemp, Warning, TEXT("Received message: %s"), *Message);
}

void FTcpServer::HandleConnection(FSocket* NewClientSocket, const TSharedRef<FInternetAddr>& ClientAddress)
{
	// 在这里处理新客户端连接的逻辑
	UE_LOG(LogTemp, Warning, TEXT("Client connected: %s"), *ClientAddress->ToString(true));

	// 接收和处理消息
	while (NewClientSocket && !bIsStopping)
	{
		TArray<uint8> ReceivedData;
		uint32 Size;

		// 接收数据
		while (NewClientSocket->HasPendingData(Size))
		{
			ReceivedData.Init(0, FMath::Min(Size, 65507u));
			int32 Read = 0;
			NewClientSocket->Recv(ReceivedData.GetData(), ReceivedData.Num(), Read);

			// 处理接收到的数据（这里假设消息以'\n'分隔）
			FString ReceivedString = StringFromBinaryArray(ReceivedData);
			TArray<FString> Messages;
			ReceivedString.ParseIntoArray(Messages, TEXT("\n"), true);

			for (const FString& Message : Messages)
			{
				// 处理文本消息
				HandleTextMessage(Message);
			}
		}

		// 睡眠一段时间，以避免空循环造成CPU过度使用
		FPlatformProcess::Sleep(0.01);
	}

	// 断开客户端连接
	// UE_LOG(LogTemp, Warning, TEXT("Client disconnected: %s"), *ClientAddress->ToString(true));
	// NewClientSocket->Close();
	// ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->DestroySocket(NewClientSocket);

}

FString FTcpServer::StringFromBinaryArray(const TArray<uint8>& BinaryArray)
{
	return FString(ANSI_TO_TCHAR(reinterpret_cast<const char*>(BinaryArray.GetData())));
}

FTcpServerReceive

h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "HAL/Runnable.h"

/**
 * 
 */
class MYPROJECT2_API FTcpServerReceive: public FRunnable
{
public:
	FTcpServerReceive(FSocket* InSocket);
	~FTcpServerReceive();
protected:
	virtual bool Init() override;
	virtual void Stop() override;
	FString StringFromBinaryArray(TArray<uint8> Array);
	void HandleTextMessage(const FString& String);
	virtual uint32 Run() override;
private:
	 FSocket* ClientSocket;
	FRunnableThread* ServerReceiveThread;
	bool bIsStopping;
};

cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "Net/FTcpServerReceive.h"

#include "Sockets.h"
#include "SocketSubsystem.h"


FTcpServerReceive::FTcpServerReceive(FSocket* InSocket)
{
	ClientSocket = InSocket;
	ServerReceiveThread = FRunnableThread::Create(this, TEXT("ServerReceiveThread"));
	bIsStopping = false;
}

FTcpServerReceive::~FTcpServerReceive()
{
	if (ClientSocket)
	{
		ClientSocket->Close();
		ISocketSubsystem::Get(PLATFORM_SOCKETSUBSYSTEM)->DestroySocket(ClientSocket);
		ClientSocket = nullptr;
	}

	if (ServerReceiveThread)
	{
		ServerReceiveThread->WaitForCompletion();
		delete ServerReceiveThread;
		ServerReceiveThread = nullptr;
	}
}

bool FTcpServerReceive::Init()
{
	if (ServerReceiveThread && ClientSocket)
	{
		UE_LOG(LogTemp, Warning, TEXT("  %s start"), *FString(__FUNCTION__));

		return true;
	}
	return false;
}

void FTcpServerReceive::Stop()
{
	bIsStopping = true;
}

FString FTcpServerReceive::StringFromBinaryArray(TArray<uint8> BinaryArray)
{
	return FString(ANSI_TO_TCHAR(reinterpret_cast<const char*>(BinaryArray.GetData())));
}

void FTcpServerReceive::HandleTextMessage(const FString& Message)
{
	UE_LOG(LogTemp, Warning, TEXT("Received message: %s"), *Message);
}

uint32 FTcpServerReceive::Run()
{
	while (ClientSocket)
	{
		TArray<uint8> ReceivedData;
		uint32 Size;

		// 接收数据
		while (ClientSocket->HasPendingData(Size))
		{
			ReceivedData.Init(0, FMath::Min(Size, 65507u));
			int32 Read = 0;
			ClientSocket->Recv(ReceivedData.GetData(), ReceivedData.Num(), Read);

			// 处理接收到的数据（这里假设消息以'\n'分隔）
			FString ReceivedString = StringFromBinaryArray(ReceivedData);
			TArray<FString> Messages;
			ReceivedString.ParseIntoArray(Messages, TEXT("\n"), true);

			for (const FString& Message : Messages)
			{
				// 处理文本消息
				HandleTextMessage(Message);
			}
		}

		// 睡眠一段时间，以避免空循环造成CPU过度使用
		FPlatformProcess::Sleep(0.05);
	}
	return 0;
}

使用

在GameInstance 使用文章来源地址https://www.toymoban.com/news/detail-632384.html

void UMyGameInstance::HandleTextMessage(const FString& Message)
{
	UE_LOG(LogTemp, Warning, TEXT("Received message: %s"), *Message);
}

bool UMyGameInstance::Connected(FSocket* Socket, const FIPv4Endpoint& FiPv4Endpoint)
{
	UE_LOG(LogTemp, Warning, TEXT("Connected %s"), *FiPv4Endpoint.ToString());
	FTcpServerReceive* ServerReceive = new FTcpServerReceive(Socket);
	return true;
}


void UMyGameInstance::Init()
{
	Super::Init();


	FIPv4Address ServerAddr;
	FIPv4Address::Parse("0.0.0.0", ServerAddr);

	FIPv4Endpoint IPv4;
	IPv4.Address = ServerAddr;
	IPv4.Port = 6666;

#if UE_SERVER
	/

	FTcpListener* TcpServer = new FTcpListener(IPv4);
	TcpServer->OnConnectionAccepted().BindUObject(this, &UMyGameInstance::Connected);

#else
	FTcpClient* TcpClient = new FTcpClient();
	TcpClient->ConnectToServer("192.168.1.6", 6666);


	FTimerHandle h;
	FTimerDelegate d = FTimerDelegate::CreateLambda([=]()
	{
		FString sent = "aaaaaa";
		TcpClient->SendMessage(sent);
	});

	// GetWorld()->GetTimerManager().SetTimer(h, d, 1.0f, true, 3.0f);

#endif
}

FString UMyGameInstance::StringFromBinaryArray(const TArray<uint8>& BinaryArray)
{
	return FString(ANSI_TO_TCHAR(reinterpret_cast<const char*>(BinaryArray.GetData())));
}

TSharedPtr<TArray<uint8>, ESPMode::ThreadSafe> UMyGameInstance::StringToByteArray(FString DataString)
{
	TArray<uint8> DataArray;
	FTCHARToUTF8 Converter(*DataString);
	DataArray.Append(reinterpret_cast<const uint8*>(Converter.Get()), Converter.Length());
	return MakeShared<TArray<uint8>, ESPMode::ThreadSafe>(MoveTemp(DataArray));
}

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