codeblocks实现TCP小写转大写

好的，这是一个基于 Code::Blocks 平台的 TCP 小写转大写的示例代码：

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

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

#define BUF_SIZE 1024
#define PORT 8888

void error_handling(char *message);

int main(int argc, char *argv[]) {
    WSADATA wsaData;
    SOCKET serv_sock, clnt_sock;
    SOCKADDR_IN serv_addr, clnt_addr;
    char message[BUF_SIZE];
    int str_len, i;

    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        error_handling("WSAStartup() error!");
    }

    serv_sock = socket(PF_INET, SOCK_STREAM, 0);
    if (serv_sock == INVALID_SOCKET) {
        error_handling("socket() error");
    }

    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(PORT);

    if (bind(serv_sock, (SOCKADDR*)&serv_addr, sizeof(serv_addr)) == SOCKET_ERROR) {
        error_handling("bind() error");
    }

    if (listen(serv_sock, 5) == SOCKET_ERROR) {
        error_handling("listen() error");
    }

    int clnt_addr_size = sizeof(clnt_addr);
    clnt_sock = accept(serv_sock, (SOCKADDR*)&clnt_addr, &clnt_addr_size);
    if (clnt_sock == INVALID_SOCKET) {
        error_handling("accept() error");
    }

    while (1) {
        str_len = recv(clnt_sock, message, BUF_SIZE, 0);
        if (str_len == 0) {
            break;
        }

        for (i = 0; i < str_len; i++) {
            message[i] = toupper(message[i]);
        }

        send(clnt_sock, message, str_len, 0);
    }

    closesocket(clnt_sock);
    closesocket(serv_sock);
    WSACleanup();
    return 0;
}

void error_handling(char *message) {
    fputs(message, stderr);
    fputc('\n', stderr);
    exit(1);
}

这个程序接收来自客户端的小写字符串，并将其转换为大写后返回给客户端。你可以在代码中修改端口号以适应你的需求。