怎么用纯C写一个可以收发16进制的tcp客户端程序啊？？？？

[GarbageCan]

怎么用纯C写一个可以收发16进制的tcp客户端程序啊？？？？

自己写的程序只能发送字符，不会转成16进制进行发送，应该怎么办。

[ehH_]

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

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

#define BUF_SIZE 1024

int main(int argc, char* argv[])
{
    if (argc < 3) {
        printf("Usage: %s <server_ip> <server_port>\n", argv[0]);
        return 1;
    }

    const char* server_ip = argv[1];
    const int server_port = atoi(argv[2]);

    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed\n");
        return 1;
    }

    SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sock == INVALID_SOCKET) {
        printf("socket failed\n");
        WSACleanup();
        return 1;
    }

    SOCKADDR_IN servAddr;
    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.s_addr = inet_addr(server_ip);
    servAddr.sin_port = htons(server_port);

    if (connect(sock, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR) {
        printf("connect failed\n");
        closesocket(sock);
        WSACleanup();
        return 1;
    }

    printf("Connected to server: %s:%d\n", server_ip, server_port);

    char send_buf[BUF_SIZE], recv_buf[BUF_SIZE];
    while (1) {
        printf("Enter 16-bit hex data to send (e.g. 0x1234): ");
        if (!fgets(send_buf, BUF_SIZE, stdin)) {
            printf("fgets failed\n");
            break;
        }

        // Convert hex string to integer
        int data = strtol(send_buf, NULL, 16);

        // Send data to server
        int len = send(sock, (char*)&data, sizeof(data), 0);
        if (len <= 0) {
            printf("send failed\n");
            break;
        }

        // Receive response from server
        len = recv(sock, recv_buf, BUF_SIZE, 0);
        if (len <= 0) {
            printf("recv failed\n");
            break;
        }

        // Print response in hex format
        printf("Received response: 0x");
        for (int i = 0; i < len; i++) {
            printf("%02x", recv_buf[i] & 0xff);
        }
        printf("\n");
    }

    closesocket(sock);
    WSACleanup();
    return 0;
}