創建libcurl http文章

Question

如何創建一個curl_form，例如在stackoverflow上進行發佈？

如果我有問題表單頁面的源看，我看到

<label for="display-name">Name</label> 
       <input id="display-name" name="display-name" type="text" size="30" maxlength="30" value="" tabindex="105"> 
      </div> 
      <div> 
       <label for="m-address">Email</label> 
       <input id="m-address" name="m-address" type="text" size="40" maxlength="100" value="" tabindex="106"> 
       <span class="edit-field-overlay">never shown</span> 
      </div> 
      <div> 
       <label for="home-page">Home Page</label> 
       <input id="home-page" name="home-page" type="text" size="40" maxlength="200" value="" tabindex="107"> 
      </div> 

如何設置這些參數的curl_httppost結構？

Answer 1

從libcurl的樣本：http://curl.haxx.se/libcurl/c/postit2.html

你不直接操縱curl_httppost。你會寫這樣的東西來設置m-address字段。

CURL *curl; 
CURLcode res; 

struct curl_httppost *formpost=NULL; 
struct curl_httppost *lastptr=NULL; 
struct curl_slist *headerlist=NULL; 
static const char buf[] = "Expect:"; 

curl_global_init(CURL_GLOBAL_ALL); 

curl_formadd(&formpost, 
      &lastptr, 
      CURLFORM_COPYNAME, "m-address", 
      CURLFORM_COPYCONTENTS, "your@mail.com", 
      CURLFORM_END); 

curl = curl_easy_init(); 
headerlist = curl_slist_append(headerlist, buf); 
if(curl) { 
    /* what URL that receives this POST */ 
    curl_easy_setopt(curl, CURLOPT_URL, "http://stackoverflow.com/someurl"); 
    if ((argc == 2) && (!strcmp(argv[1], "noexpectheader"))) 
     /* only disable 100-continue header if explicitly requested */ 
     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist); 
    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost); 
    res = curl_easy_perform(curl); 

    /* always cleanup */ 
    curl_easy_cleanup(curl); 

    /* then cleanup the formpost chain */ 
    curl_formfree(formpost); 
    /* free slist */ 
    curl_slist_free_all (headerlist); 

Answer 2

由於這種形式是不是多一個，也許你可以簡單地使用： http://curl.haxx.se/libcurl/c/http-post.html

CURL *curl; 
CURLcode res; 

/* In windows, this will init the winsock stuff */ 
curl_global_init(CURL_GLOBAL_ALL); 

/* get a curl handle */ 
curl = curl_easy_init(); 
if(curl) { 
    /* First set the URL that is about to receive our POST. This URL can 
    just as well be a https:// URL if that is what should receive the 
    data. */ 
    curl_easy_setopt(curl, CURLOPT_URL, "http://postit.example.com/moo.cgi"); 
    /* Now specify the POST data */ 
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "m-address=your@mail.com"); 

    /* Perform the request, res will get the return code */ 
    res = curl_easy_perform(curl); 
    /* Check for errors */ 
    if(res != CURLE_OK) 
    fprintf(stderr, "curl_easy_perform() failed: %s\n", 
      curl_easy_strerror(res)); 

    /* always cleanup */ 
    curl_easy_cleanup(curl); 
} 
curl_global_cleanup();