發送端向接收端發送數據，ip地址和端口號要與接收端一致

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?cpp_UDP客戶端，發送端

#include <winsock2.h> #include <WS2tcpip.h> #include <iostream> using namespace std;//添加動態庫的lib #pragma comment(lib, "ws2_32.lib")int main() {SOCKET m_Socket;SOCKADDR_IN m_RemoteAddress; //遠程地址int m_RemoteAddressLen;// socket環境WSADATA wsaData;if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {cout << "WSAStartup error:" << GetLastError() << endl;return false;}// socket對象m_Socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);if (m_Socket == INVALID_SOCKET){closesocket(m_Socket);m_Socket = INVALID_SOCKET;return false;}// 遠端地址const char* ip = "172.22.64.148";int port = 9800;m_RemoteAddress.sin_family = AF_INET;m_RemoteAddress.sin_port = htons(port);m_RemoteAddressLen = sizeof(m_RemoteAddress);inet_pton(AF_INET, ip, &m_RemoteAddress.sin_addr);// 接收和發送char recvBuf[1024] = { 0 };char sendBuf[1024] = "Nice to meet you!我的";while (1) {int sendLen = sendto(m_Socket, sendBuf, strlen(sendBuf), 0, (sockaddr*)&m_RemoteAddress, m_RemoteAddressLen);if (sendLen > 0) {std::printf("發送到遠程端連接, 其ip: %s, port: %d\n", inet_ntoa(m_RemoteAddress.sin_addr), ntohs(m_RemoteAddress.sin_port));cout << "發送到遠程端的信息： " << sendBuf << endl;}int recvLen = recvfrom(m_Socket, recvBuf, 1024, 0, NULL, NULL);if (recvLen > 0) {std::printf("接收到一個連接, 其ip: %s, port: %d\n", inet_ntoa(m_RemoteAddress.sin_addr), ntohs(m_RemoteAddress.sin_port));cout << "接收到一個信息： " << recvBuf << endl;}}closesocket(m_Socket);WSACleanup();return true; }

cpp_UDP服務端，接收端

#include <winsock2.h> #include <WS2tcpip.h> #include <iostream>using namespace std;//添加動態庫的lib #pragma comment(lib, "ws2_32.lib")int main() {SOCKET m_Socket;SOCKADDR_IN m_BindAddress; //綁定地址SOCKADDR_IN m_RemoteAddress; //遠程地址int m_RemoteAddressLen;// socket環境WSADATA wsaData;if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {cout << "WSAStartup error:" << GetLastError() << endl;return false;}// socket對象m_Socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);if (m_Socket == INVALID_SOCKET){closesocket(m_Socket);m_Socket = INVALID_SOCKET;return false;}// 綁定占用<ip, port>const char* ip = "172.22.64.42";int port = 9800;m_BindAddress.sin_family = AF_INET;m_BindAddress.sin_addr.S_un.S_addr = inet_addr(ip);m_BindAddress.sin_port = htons(port);auto ret = bind(m_Socket, (sockaddr*)&m_BindAddress, sizeof(SOCKADDR));if (ret == SOCKET_ERROR){closesocket(m_Socket);m_Socket = INVALID_SOCKET;return false;}// 接收和發送char recvBuf[1024] = { 0 };char sendBuf[1024] = "Nice to meet you, too!";m_RemoteAddressLen = sizeof(m_RemoteAddress);std::printf("已設置綁定占用的連接, 其ip: %s, port: %d\n", inet_ntoa(m_BindAddress.sin_addr), ntohs(m_BindAddress.sin_port));while (1) {int recvLen = recvfrom(m_Socket, recvBuf, 1024, 0, (sockaddr*)&m_RemoteAddress, &m_RemoteAddressLen);if (recvLen > 0) {std::printf("接收到一個連接, 其ip: %s, port: %d\n", inet_ntoa(m_RemoteAddress.sin_addr), ntohs(m_RemoteAddress.sin_port));cout << "接收到一個信息： " << recvBuf << endl;}int sendLen = sendto(m_Socket, sendBuf, strlen(sendBuf), 0, (sockaddr*)&m_RemoteAddress, m_RemoteAddressLen);if (sendLen > 0) {cout << "發送到遠程端的信息： " << sendBuf << endl;}}closesocket(m_Socket);WSACleanup();return true; }

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