CMakeLua/Utilities/cmcurl-7.19.0/docs/examples/multi-post.c

   1 /*****************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: multi-post.c,v 1.1.1.1 2008-09-23 16:32:05 hoffman Exp $
   9  *
  10  * This is an example application source code using the multi interface
  11  * to do a multipart formpost without "blocking".
  12  */
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <sys/time.h>
  16
  17 #include <curl/curl.h>
  18
  19 int main(int argc, char *argv[])
  20 {
  21   CURL *curl;
  22
  23   CURLM *multi_handle;
  24   int still_running;
  25
  26   struct curl_httppost *formpost=NULL;
  27   struct curl_httppost *lastptr=NULL;
  28   struct curl_slist *headerlist=NULL;
  29   static const char buf[] = "Expect:";
  30
  31   /* Fill in the file upload field. This makes libcurl load data from
  32      the given file name when curl_easy_perform() is called. */
  33   curl_formadd(&formpost,
  34                &lastptr,
  35                CURLFORM_COPYNAME, "sendfile",
  36                CURLFORM_FILE, "postit2.c",
  37                CURLFORM_END);
  38
  39   /* Fill in the filename field */
  40   curl_formadd(&formpost,
  41                &lastptr,
  42                CURLFORM_COPYNAME, "filename",
  43                CURLFORM_COPYCONTENTS, "postit2.c",
  44                CURLFORM_END);
  45
  46   /* Fill in the submit field too, even if this is rarely needed */
  47   curl_formadd(&formpost,
  48                &lastptr,
  49                CURLFORM_COPYNAME, "submit",
  50                CURLFORM_COPYCONTENTS, "send",
  51                CURLFORM_END);
  52
  53   curl = curl_easy_init();
  54   multi_handle = curl_multi_init();
  55
  56   /* initalize custom header list (stating that Expect: 100-continue is not
  57      wanted */
  58   headerlist = curl_slist_append(headerlist, buf);
  59   if(curl && multi_handle) {
  60
  61     /* what URL that receives this POST */
  62     curl_easy_setopt(curl, CURLOPT_URL,
  63                      "http://www.fillinyoururl.com/upload.cgi");
  64     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
  65
  66     curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
  67     curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
  68
  69     curl_multi_add_handle(multi_handle, curl);
  70
  71     while(CURLM_CALL_MULTI_PERFORM ==
  72           curl_multi_perform(multi_handle, &still_running));
  73
  74     while(still_running) {
  75       struct timeval timeout;
  76       int rc; /* select() return code */
  77
  78       fd_set fdread;
  79       fd_set fdwrite;
  80       fd_set fdexcep;
  81       int maxfd;
  82
  83       FD_ZERO(&fdread);
  84       FD_ZERO(&fdwrite);
  85       FD_ZERO(&fdexcep);
  86
  87       /* set a suitable timeout to play around with */
  88       timeout.tv_sec = 1;
  89       timeout.tv_usec = 0;
  90
  91       /* get file descriptors from the transfers */
  92       curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
  93
  94       /* In a real-world program you OF COURSE check the return code of the
  95          function calls, *and* you make sure that maxfd is bigger than -1
  96          so that the call to select() below makes sense! */
  97
  98       rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
  99
 100       switch(rc) {
 101       case -1:
 102         /* select error */
 103         break;
 104       case 0:
 105         printf("timeout!\n");
 106       default:
 107         /* timeout or readable/writable sockets */
 108         printf("perform!\n");
 109         while(CURLM_CALL_MULTI_PERFORM ==
 110               curl_multi_perform(multi_handle, &still_running));
 111         printf("running: %d!\n", still_running);
 112         break;
 113       }
 114     }
 115
 116     curl_multi_cleanup(multi_handle);
 117
 118     /* always cleanup */
 119     curl_easy_cleanup(curl);
 120
 121     /* then cleanup the formpost chain */
 122     curl_formfree(formpost);
 123
 124     /* free slist */
 125     curl_slist_free_all (headerlist);
 126   }
 127   return 0;
 128 }