使用C语言和libsocket库编写爬虫程序

#include
#include
#include
#include
#include
#include
#include
#include
#include

#define MAX_HOST_LENGTH 1024
#define MAX_PROXY_LENGTH 1024
#define MAX_URL_LENGTH 1024
#define MAX_PORT_LENGTH 5

int main() {
    int proxy_sockfd;
    struct sockaddr_in proxy_addr;
    char proxy_host[MAX_PROXY_LENGTH];
    char proxy_port[MAX_PORT_LENGTH];
    char url[MAX_URL_LENGTH];
    char response[MAX_HOST_LENGTH];
    int response_len;
    CURL *curl;

    // Set up the proxy server address
    inet_aton(proxy_host, &proxy_addr.sin_addr);
    proxy_addr.sin_family = AF_INET;
    proxy_addr.sin_port = htons(8000);

    // Set up the video URL
    strcpy(url, "");

    // Initialize the CURL library
    curl_global_init(CURL_GLOBAL_DEFAULT);

    // Create a CURL handle
    curl = curl_easy_init();

    if (curl) {
        // Set the proxy server
        curl_easy_setopt(curl, CURLOPT_PROXY, proxy_host);
        curl_easy_setopt(curl, CURLOPT_PROXYPORT, proxy_port);

        // Set the target URL
        curl_easy_setopt(curl, CURLOPT_URL, url);

        // Set the response buffer
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_response);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, response);

        // Perform the request
        CURLcode res = curl_easy_perform(curl);

        // Check for errors
        if (res != CURLE_OK) {
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));
        }

        // Free the CURL handle and global library
        curl_easy_cleanup(curl);
        curl_global_cleanup();
    }

    return 0;
}
```

这是一个简单的C语言爬虫程序，使用libcurl库来发送HTTP请求，并使用指定的代理服务器来抓取视频。