用CVI编写一个UDP网络测试程序

好的，为您提供一个简单的UDP网络测试程序的代码，此代码可以在CVI中编写并运行：

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

#define BUFLEN 512

void main()
{
    WSADATA wsa;
    SOCKET s;
    struct sockaddr_in server, si_other;
    int slen, recv_len;
    char buf[BUFLEN];
    char message[BUFLEN];

    // 初始化Winsock
    printf("Initialising Winsock...\n");
    if (WSAStartup(MAKEWORD(2,2),&wsa) != 0)
    {
        printf("Failed. Error Code : %d", WSAGetLastError());
        return;
    }

    // 创建socket
    if((s = socket(AF_INET , SOCK_DGRAM , 0 )) == INVALID_SOCKET)
    {
        printf("Could not create socket : %d" , WSAGetLastError());
        return;
    }

    // 设置服务器地址和端口
    memset((char *) &server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_addr.S_un.S_addr = INADDR_ANY;
    server.sin_port = htons(8888);

    // 绑定socket到地址和端口
    if( bind(s ,(struct sockaddr *)&server , sizeof(server)) == SOCKET_ERROR)
    {
        printf("Bind failed with error code : %d" , WSAGetLastError());
        return;
    }
     
    slen = sizeof(si_other);

    // 循环接收数据并发送响应
    while(1)
    {
        printf("Waiting for data...\n");

        // 接收数据
        if ((recv_len = recvfrom(s, buf, BUFLEN, 0, (struct sockaddr *) &si_other, &slen)) == SOCKET_ERROR)
        {
            printf("recvfrom() failed with error code : %d" , WSAGetLastError());
            return;
        }
         
        // 打印接收到的数据
        printf("Received packet from %s:%d\n", inet_ntoa(si_other.sin_addr), ntohs(si_other.sin_port));
        printf("Data: %s\n" , buf);
         
        // 发送响应
        sprintf(message, "Received %d bytes", recv_len);
        if (sendto(s, message, strlen(message), 0, (struct sockaddr*) &si_other, slen) == SOCKET_ERROR)
        {
            printf("sendto() failed with error code : %d" , WSAGetLastError());
            return;
        }
    }

    closesocket(s);
    WSACleanup();

    return;
}

您可以将此代码复制到CVI中，然后编译并运行该程序以进行测试。记得在运行之前检查您的防火墙设置，确保端口8888未被阻止。