WINDOWS下C++ tcp的p2p模式示例代码-DPDK中文网

下面是一个简单的示例代码，演示了在Windows下使用C++实现TCP的P2P模式：

服务器端代码：

#include <iostream>
#include <winsock2.h>

#define PORT 8080

int main() {
    WSADATA wsaData;
    SOCKET serverSocket, clientSocket;
    SOCKADDR_IN serverAddr, clientAddr;

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cout << "Failed to initialize Winsock" << std::endl;
        return -1;
    }

    // 创建服务器端socket
    serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == INVALID_SOCKET) {
        std::cout << "Failed to create socket" << std::endl;
        WSACleanup();
        return -1;
    }

    // 设置服务器地址和端口
    memset(&serverAddr, 0, sizeof(serverAddr));
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_addr.s_addr = INADDR_ANY;
    serverAddr.sin_port = htons(PORT);

    // 绑定socket到指定地址和端口
    if (bind(serverSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        std::cout << "Failed to bind socket" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

  	// 监听连接请求
  	if (listen(serverSocket, SOMAXCONN) == SOCKET_ERROR) {
      	std::cout << "Listen failed with error" << std::endl;
      	closesocket(serverSocket);
      	WSACleanup();
      	return -1;
  	}

  	// 等待客户端连接
  	std::cout << "Server listening on port " << PORT << std::endl;
  	int clientAddrSize = sizeof(clientAddr);
  	clientSocket = accept(serverSocket, (struct sockaddr*)&clientAddr, &clientAddrSize);
  	if (clientSocket == INVALID_SOCKET) {
      	std::cout << "Accept failed with error" << std::endl;
      	closesocket(serverSocket);
      	WSACleanup();
      	return -1;
  	}

    // 和客户端进行通信...
  
    // 关闭socket和清理Winsock库
    closesocket(clientSocket);
    closesocket(serverSocket);
    WSACleanup();

    return 0;
}

客户端代码：

#include <iostream>
#include <winsock2.h>

#define SERVER_IP "127.0.0.1"
#define PORT 8080

int main() {
    WSADATA wsaData;
    SOCKET clientSocket;
    SOCKADDR_IN serverAddr;

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cout << "Failed to initialize Winsock" << std::endl;
        return -1;
    }

    // 创建客户端socket
    clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        std::cout << "Failed to create socket" << std::endl;
        WSACleanup();
        return -1;
    }

    // 设置服务器地址和端口
	  memset(&serverAddr, 0, sizeof(serverAddr));
	  serverAddr.sin_family = AF_INET;
	  serverAddr.sin_port = htons(PORT);
	  if (inet_pton(AF_INET, SERVER_IP, &(serverAddr.sin_addr)) <= 0) {
        std::cout << "Invalid address/Address not supported" << std::endl;
		    closesocket(clientSocket);
    		WSACleanup();
    		return -1;
  	}

    // 连接到服务器
  	if (connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
      	std::cout << "Failed to connect to server" << std::endl;
      	closesocket(clientSocket);
      	WSACleanup();
      	return -1;
  	}

    // 和服务器进行通信...

    // 关闭socket和清理Winsock库
    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

这只是一个简单的示例，仅涉及了连接的建立，并未实现P2P通信。要实现完整的P2P通信，需要在客户端之间建立直接连接，可以使用STUN、TURN或其他技术来解决NAT穿透问题。

请注意，上述代码仅适用于Windows环境，并且省略了错误处理和一些安全性和稳定性的考虑。在实际开发中，需要进行更多细节的处理和优化。

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