在labwindows平台下用c语言编写一个tcp传输协议样例

在LabVIEW平台下直接编写C语言程序并不是标准做法，因为LabVIEW是一个图形化编程环境，它有自己的脚本语言VIs（Virtual Instruments）。然而，如果你需要通过 LabVIEW 与其他C程序交互，可以使用NI-VISA库或其他通信模块来驱动C写的TCP服务器或客户端。

如果你想在C语言中创建一个简单的TCP服务器或客户端，你可以参考下面的基本步骤：

**C TCP Server 示例:**

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define PORT 12345

int main() {
    int server_fd, client_fd;
    struct sockaddr_in server_addr, client_addr;
    socklen_t addr_len = sizeof(struct sockaddr_in);

    // 创建套接字
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (server_fd == -1) {
        perror("Error creating socket");
        return 1;
    }

    // 设置服务器地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY); // 对应所有IP地址

    // 绑定并监听
    if (bind(server_fd, (struct sockaddr *)&server_addr, addr_len) < 0) {
        perror("Error binding to port");
        close(server_fd);
        return 1;
    }
    listen(server_fd, 3); // 等待连接

    printf("Server listening on %d...\n", PORT);

    // 接受客户端连接
    client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &addr_len);
    if (client_fd == -1) {
        perror("Error accepting connection");
        close(server_fd);
        return 1;
    }

    char buffer[1024] = {0};
    while (true) {
        ssize_t bytes_received = recv(client_fd, buffer, sizeof(buffer), 0);
        if (bytes_received <= 0) break;

        printf("Received from client: %s\n", buffer);

        send(client_fd, "Message received!", strlen("Message received!"), 0);
    }

    close(client_fd);
    close(server_fd);
    return 0;
}

**C TCP Client 示例:**

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>

#define SERVER_IP "127.0.0.1"
#define PORT 12345

int main() {
    int client_fd;
    struct sockaddr_in server_addr;
    socklen_t addr_len = sizeof(server_addr);

    // 创建套接字
    client_fd = socket(AF_INET, SOCK_STREAM, 0);
    if (client_fd == -1) {
        perror("Error creating socket");
        return 1;
    }

    // 设置客户端地址
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr);

    // 连接到服务器
    if (connect(client_fd, (struct sockaddr *)&server_addr, addr_len) < 0) {
        perror("Error connecting to server");
        close(client_fd);
        return 1;
    }

    char message[] = "Hello, Server!";
    send(client_fd, message, strlen(message), 0);

    char buffer[1024];
    ssize_t bytes_received = recv(client_fd, buffer, sizeof(buffer), 0);
    if (bytes_received > 0) {
        printf("Received from server: %s\n", buffer);
    } else {
        perror("Error receiving data");
    }

    close(client_fd);
    return 0;
}