CVI编写UDP网络测试代码

以下是一个简单的CVI程序，用于发送和接收UDP网络数据包：

#include <ansi_c.h>
#include <utility.h>
#include <winsock2.h>

#pragma comment(lib, "Ws2_32.lib") // 需要链接的库文件

#define BUF_SIZE 1024 // 缓冲区大小

int main(void)
{
    WSADATA wsaData;
    int iResult;
    SOCKET sendSocket = INVALID_SOCKET;
    SOCKET recvSocket = INVALID_SOCKET;
    struct sockaddr_in recvAddr, sendAddr;
    char sendBuf[BUF_SIZE];
    char recvBuf[BUF_SIZE];
    int recvAddrLen = sizeof(recvAddr);
    int i;

    // 初始化Winsock库
    iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed: %d\n", iResult);
        return 1;
    }

    // 创建发送和接收socket
    sendSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (sendSocket == INVALID_SOCKET) {
        printf("Error creating send socket: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    recvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (recvSocket == INVALID_SOCKET) {
        printf("Error creating recv socket: %d\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    // 设置接收socket的地址
    memset(&recvAddr, 0, sizeof(recvAddr));
    recvAddr.sin_family = AF_INET;
    recvAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    recvAddr.sin_port = htons(12345);

    // 绑定接收socket到本地地址
    iResult = bind(recvSocket, (struct sockaddr*)&recvAddr, sizeof(recvAddr));
    if (iResult == SOCKET_ERROR) {
        printf("Error binding recv socket: %d\n", WSAGetLastError());
        closesocket(sendSocket);
        closesocket(recvSocket);
        WSACleanup();
        return 1;
    }

    // 设置发送socket的地址
    memset(&sendAddr, 0, sizeof(sendAddr));
    sendAddr.sin_family = AF_INET;
    sendAddr.sin_addr.s_addr = inet_addr("127.0.0.1"); // 发送到本地地址
    sendAddr.sin_port = htons(12345);

    // 发送和接收数据
    for (i = 0; i < 10; i++) {
        sprintf(sendBuf, "Message %d", i+1);
        iResult = sendto(sendSocket, sendBuf, strlen(sendBuf), 0, (struct sockaddr*)&sendAddr, sizeof(sendAddr));
        if (iResult == SOCKET_ERROR) {
            printf("Error sending message: %d\n", WSAGetLastError());
            closesocket(sendSocket);
            closesocket(recvSocket);
            WSACleanup();
            return 1;
        }

        iResult = recvfrom(recvSocket, recvBuf, BUF_SIZE, 0, (struct sockaddr*)&recvAddr, &recvAddrLen);
        if (iResult == SOCKET_ERROR) {
            printf("Error receiving message: %d\n", WSAGetLastError());
            closesocket(sendSocket);
            closesocket(recvSocket);
            WSACleanup();
            return 1;
        }

        recvBuf[iResult] = '\0';
        printf("Received message: %s\n", recvBuf);
    }

    // 关闭socket和Winsock库
    closesocket(sendSocket);
    closesocket(recvSocket);
    WSACleanup();

    return 0;
}

该程序创建了一个发送和接收UDP数据包的socket，并将接收socket绑定到本地地址上。程序发送10个带有消息编号的数据包，接收并打印回应。