使用getopt的C程序无法解析url参数

Question

我正在尝试使用 getopt 从命令行输入一个 url，以用于 HTTP get、post、put 和 delete。 HTTP GET 早些时候工作，但由于某种原因，我无法弄清楚如何解析 url，以便 HTTP GET 现在成功。当我打印 url 时，它显示它是预期的格式，但 curl 抱怨说无法解析主机名。有人可以向我解释如何解决这个问题以及如何使它只有在命令行中输入的第一个 url 被接受？谢谢！

#include<stdio.h>
#include<getopt.h>
#include<curl/curl.h>
#include<stdlib.h>

#define OK 0
#define INIT_ERR 1
#define REQ_ERR 2

// function for HTTP GET
void get(char* url, CURL *curl, CURLcode res) {
    long http_code = 0;
    curl = curl_easy_init();
    if(curl) {
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
        res = curl_easy_perform(curl);
        if(res != CURLE_OK) {
            fprintf(stderr, "[CURL] Could not execute HTTP GET: %s\n", curl_easy_strerror(res));
            //return REQ_ERR;
        }
        curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_code);
        printf("[HTTP CODE]: %ld\n", http_code);
        curl_easy_cleanup(curl);
    }
}

// function for HTTP PUT
void put() {

}

// function for HTTP POST
void post() {

}

// function for HTTP delete
void delete() {

}


int main(int argc, char **argv) {

    int c;
    char *content, *url; 
    CURL *curl;
    CURLcode res;

    while(1) {
        static struct option long_options[] = 
        {
            {"help", no_argument, 0, 'h'},
            {"get", no_argument, 0, 'g'},
            {"url ", required_argument, 0 , 'u'},
            {"post", required_argument, 0, 'o'},
            {"put", required_argument, 0, 'p'},
            {"delete", required_argument, 0, 'd'},
            {0,0,0,0}
        };

        // getopt stores option index here
        int long_index = 0;

        c = getopt_long_only(argc, argv, "hgo:p:d:u:", \
            long_options, &long_index);

        // detect end of options    
        if(c == -1)
            break;

        switch(c) {
            case 'h':
                printf("\n[HELP] Usage: ./test [VERB] 'content' [URL] <url>\n\n");
                printf("----------------------- HELP OPTIONS -----------------------------------------\n\n");
                printf(" FLAGS      ARGUMENTS   EXAMPLE ARG FORMAT      SUMMARY\n");
                printf("------------------------------------------------------------------------------\n");
                printf("-h/--help   N/A     N/A             help options\n");
                printf("-g/--get    N/A     N/A             [VERB] http get option\n");
                printf("-o/--post   'content'   'Post this stuff.'      [VERB] http post option\n");
                printf("-p/--put    'content'   'Put this stuff.'       [VERB] http put option\n");
                printf("-d/--delete 'content'   'Delete this stuff/'        [VERB] http delete option\n");
                printf("-u/--url    'url'       'http://www.cnn.com'        [URL] http url of server\n");
                printf("                'http://localhost:PORT' \n");
                printf("                'http://IPADDRESS:PORT'\n\n");
                printf("------------------------------------------------------------------------------\n");
                printf("            Example USAGE\n");
                printf("------------------------------------------------------------------------------\n");
                printf("HTTP GET -  ./test --get --url 'http://www.cnn.com\n");
                printf("HTTP POST - ./test --post 'Post this content.' --url 'http://localhost:8080\n");
                printf("HTTP PUT -  ./test --put 'Put this content.' --url 'http://localhost:8080\n");
                printf("HTTP DELETE -   ./test --delete 'Delete this content.' --url 'http://localhost:8080'\n\n");
                break;
            case 'g':
                printf("[HTTP GET]\n");
                url;
                get(url, curl, res);
                break;
            case 'u':
                url = optarg;
                printf("[HTTP URL] url: %s\n", url);
                break;
            case 'o':
                content = optarg;
                printf("[HTTP POST] content: %s\n", content);
                break;
            case 'p':
                content = optarg;
                printf("[HTTP PUT] content: %s\n", content);
                break;
            case 'd':
                content = optarg;
                printf("[HTTP DELETE] content: %s\n", content);
                break;
            case '?':
                //getopt_long already printed error message
                break;
            default:
                abort();
        }
    //get(url, curl, res);
    }

    return OK;
}

Answer 1

正如@MichaelBurr 指出的那样，根据此代码，-g 应该在 --url /-u 之后给出。我试过 ./test --url "hxxp://google.com" -g 并且正在工作。 您可能需要检查 localhost:8000