Question

我尝试使用getopt从命令行输入一个url，用于HTTP get，post，put和delete。 HTTP GET之前工作正常，但出于某种原因，我无法弄清楚如何解析网址，以便HTTP GET现在成功。当我打印网址时，它表明它处于预期的格式，但卷曲抱怨说主机名无法解析。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所指出的那样，-g应该根据这段代码在--url / -u之后给出。我试过./test --url“hxxp：//google.com”-g并且正在运行。您可能需要检查localhost：8000

使用getopt的C程序无法解析url参数

1 个答案: