利用Winsock控件编写TCP应用程序或者UDP应用程序。具体代码

Winsock控件是Windows提供的一种用于网络编程的API，通过该API可以实现TCP或UDP应用程序的开发。

下面是一个简单的TCP应用程序代码示例：

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

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsa;
    SOCKET s;
    struct sockaddr_in server;
    char message[100], server_reply[200];

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("Failed. Error Code: %d", WSAGetLastError());
        return 1;
    }

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

    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);

    // 连接到服务器
    if (connect(s, (struct sockaddr *)&server, sizeof(server)) < 0) {
        puts("Connect error");
        return 1;
    }

    puts("Connected\n");

    // 发送数据
    printf("Enter message : ");
    gets(message);

    if (send(s, message, strlen(message), 0) < 0) {
        puts("Send failed");
        return 1;
    }

    // 接收服务器响应
    if (recv(s, server_reply, 200, 0) < 0) {
        puts("recv failed");
    }

    puts("Server reply :");
    puts(server_reply);

    closesocket(s);
    WSACleanup();

    return 0;
}

下面是一个简单的UDP应用程序代码示例：

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

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsa;
    SOCKET s;
    struct sockaddr_in server;
    char message[100], server_reply[200];
    int server_reply_size, recv_len;

    // 初始化Winsock库
    if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0) {
        printf("Failed. Error Code: %d", WSAGetLastError());
        return 1;
    }

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

    server.sin_addr.s_addr = inet_addr("127.0.0.1");
    server.sin_family = AF_INET;
    server.sin_port = htons(8888);

    // 发送数据
    printf("Enter message : ");
    gets(message);

    if (sendto(s, message, strlen(message), 0, (struct sockaddr *)&server, sizeof(server)) == SOCKET_ERROR) {
        printf("sendto failed with error code : %d", WSAGetLastError());
        return 1;
    }

    puts("Data Sent\n");

    // 接收服务器响应
    server_reply_size = sizeof(server);
    if ((recv_len = recvfrom(s, server_reply, 200, 0, (struct sockaddr *)&server, &server_reply_size)) == SOCKET_ERROR) {
        printf("recvfrom failed with error code : %d", WSAGetLastError());
        return 1;
    }

    puts("Reply received\n");

    server_reply[recv_len] = '\0';
    puts(server_reply);

    closesocket(s);
    WSACleanup();

    return 0;
}