Henrik Storner's rewrite that includes a nice usage of curl_multi_info_read()

docs/examples/multi-app.c

@@ -23,29 +23,38 @@
 /*
  * Download a HTTP file and upload an FTP file simultaneously.
  */
+
+#define HANDLECOUNT 2	/* Number of simultaneous transfers */
+#define HTTP_HANDLE 0	/* Index for the HTTP transfer */
+#define FTP_HANDLE 1	/* Index for the FTP transfer */
+
 int main(int argc, char **argv)
 {
-  CURL *http_handle;
-  CURL *ftp_handle;
+  CURL *handles[HANDLECOUNT];
   CURLM *multi_handle;
 
   int still_running; /* keep number of running handles */
+  int i;
 
-  http_handle = curl_easy_init();
-  ftp_handle  = curl_easy_init();
+  CURLMsg *msg; /* for picking up messages with the transfer status */
+  int msgs_left; /* how many messages are left */
+
+  /* Allocate one CURL handle per transfer */
+  for (i=0; i<HANDLECOUNT; i++)
+      handles[i] = curl_easy_init();
 
   /* set the options (I left out a few, you'll get the point anyway) */
-  curl_easy_setopt(http_handle, CURLOPT_URL, "http://website.com");
+  curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://website.com");
 
-  curl_easy_setopt(ftp_handle, CURLOPT_URL, "ftp://ftpsite.com");
-  curl_easy_setopt(ftp_handle, CURLOPT_UPLOAD, TRUE);
+  curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://ftpsite.com");
+  curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, TRUE);
 
   /* init a multi stack */
   multi_handle = curl_multi_init();
 
   /* add the individual transfers */
-  curl_multi_add_handle(multi_handle, http_handle);
-  curl_multi_add_handle(multi_handle, ftp_handle);
+  for (i=0; i<HANDLECOUNT; i++)
+      curl_multi_add_handle(multi_handle, handles[i]);
 
   /* we start some action by calling perform right away */
   while(CURLM_CALL_MULTI_PERFORM ==
@@ -91,9 +100,29 @@ int main(int argc, char **argv)
 
   curl_multi_cleanup(multi_handle);
 
-  curl_easy_cleanup(http_handle);
-  curl_easy_cleanup(ftp_handle);
+  /* See how the transfers went */
+  while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
+    if (msg->msg == CURLMSG_DONE) {
 
+       int idx, found = 0;
+
+       /* Find out which handle this message is about */
+       for (idx=0; (!found && (idx<HANDLECOUNT)); idx++) found = (msg->easy_handle == handles[idx]);
+
+       switch (idx) {
+         case HTTP_HANDLE:
+	   printf("HTTP transfer completed with status %d\n", msg->data.result);
+	   break;
+	 case FTP_HANDLE:
+	   printf("FTP transfer completed with status %d\n", msg->data.result);
+	   break;
+       }
+    }
+  }
+
+  /* Free the CURL handles */
+  for (i=0; i<HANDLECOUNT; i++)
+      curl_easy_cleanup(handles[i]);
 
   return 0;
 }