windows环境，c语言，写一个tcp连接的client, 要求connet要非阻塞式连接，连接成功后发送hello-DPDK中文网

下面是一个在Windows环境下使用C语言编写的非阻塞式TCP连接的客户端示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <ws2tcpip.h>

#define DEFAULT_PORT "8080"
#define SERVER_IP "127.0.0.1"

int main() {
    WSADATA wsaData;
    SOCKET clientSocket = INVALID_SOCKET;
    struct addrinfo* result = NULL, * ptr = NULL, hints;

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

    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_UNSPEC;  // 支持IPv4和IPv6
    hints.ai_socktype = SOCK_STREAM;  // TCP流式套接字
    hints.ai_protocol = IPPROTO_TCP;  // 使用TCP协议

    // 解析服务器地址信息
    if (getaddrinfo(SERVER_IP, DEFAULT_PORT, &hints, &result) != 0) {
        printf("Failed to resolve server address\n");
        WSACleanup();
        return 1;
    }

    // 创建套接字并进行非阻塞设置
    clientSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
    
	// 设置为非阻塞模式
	u_long mode = 1;
	if (ioctlsocket(clientSocket, FIONBIO, &mode) != NO_ERROR) {
	    printf("Failed to set socket as non-blocking\n");
	    freeaddrinfo(result);
	    closesocket(clientSocket);
	    WSACleanup();
	    return 1;
	}

    // 连接服务器
    if (connect(clientSocket, result->ai_addr, (int)result->ai_addrlen) == SOCKET_ERROR) {
        int errorCode = WSAGetLastError();
        if (errorCode != WSAEWOULDBLOCK && errorCode != WSAEINPROGRESS) {
            printf("Failed to connect to server\n");
            freeaddrinfo(result);
            closesocket(clientSocket);
            WSACleanup();
            return 1;
        }
    }

    // 等待连接完成（非阻塞）
    fd_set writeSet;
    FD_ZERO(&writeSet);
    FD_SET(clientSocket, &writeSet);

    struct timeval timeout;
    timeout.tv_sec = 5;  // 设置超时时间为5秒
    timeout.tv_usec = 0;

    if (select(0, NULL, &writeSet, NULL, &timeout) <= 0) {
        printf("Connection timed out or failed\n");
        freeaddrinfo(result);
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }

	freeaddrinfo(result);

	printf("Connected to the server!\n");

	// 发送消息给服务器
	const char* message = "hello";
	if (send(clientSocket, message, strlen(message), 0) == SOCKET_ERROR)
	{
		printf("Failed to send message\n");
		closesocket(clientSocket);
		WSACleanup();
		return 1;
	}

	printf("Message sent: %s\n", message);

	closesocket(clientSocket);
	WSACleanup();

	return 0;
}

请注意，在使用此代码之前，您需要安装并链接Winsock库。编译时，请确保将-lws2_32选项添加到编译命令中。

该代码通过使用ioctlsocket()函数将套接字设置为非阻塞模式，并使用select()函数等待连接完成。然后，它发送”hello”消息给服务器。

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