通过Win32应用程序从C/C++中的UDP端口读取

#include <stdio.h>
#include <winsock2.h>

#define BUFFER_SIZE 1024

int main() {
    WSADATA wsaData;
    SOCKET udpSocket;
    struct sockaddr_in localAddr;
    struct sockaddr_in clientAddr;
    int clientAddrLen = sizeof(clientAddr);
    char buffer[BUFFER_SIZE];

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("Failed to initialize Winsock\n");
        return 1;
    }

    // 创建UDP套接字
    udpSocket = socket(AF_INET, SOCK_DGRAM, 0);
    if (udpSocket == INVALID_SOCKET) {
        printf("Failed to create UDP socket\n");
        WSACleanup();
        return 1;
    }

    // 绑定套接字到本地端口
    localAddr.sin_family = AF_INET;
    localAddr.sin_addr.s_addr = INADDR_ANY;
    localAddr.sin_port = htons(12345); // 本地端口号
    if (bind(udpSocket, (struct sockaddr*)&localAddr, sizeof(localAddr)) == SOCKET_ERROR) {
        printf("Failed to bind UDP socket\n");
        closesocket(udpSocket);
        WSACleanup();
        return 1;
    }

    // 接收数据
    int bytesRead = recvfrom(udpSocket, buffer, BUFFER_SIZE, 0, (struct sockaddr*)&clientAddr, &clientAddrLen);
    if (bytesRead == SOCKET_ERROR) {
        printf("Failed to receive data\n");
        closesocket(udpSocket);
        WSACleanup();
        return 1;
    }

    // 处理接收到的数据
    printf("Received data: %s\n", buffer);

    // 关闭套接字
    closesocket(udpSocket);

    // 清理Winsock库
    WSACleanup();

    return 0;
}