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deps/curl/docs/examples/multi-formadd.c

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+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+/* <DESC>
+ * using the multi interface to do a multipart formpost without blocking
+ * </DESC>
+ */
+
+/*
+ * Warning: this example uses the deprecated form api. See "multi-post.c"
+ *          for a similar example using the mime api.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+
+#include <curl/curl.h>
+
+int main(void)
+{
+  CURL *curl;
+
+  CURLM *multi_handle;
+  int still_running = 0;
+
+  struct curl_httppost *formpost = NULL;
+  struct curl_httppost *lastptr = NULL;
+  struct curl_slist *headerlist = NULL;
+  static const char buf[] = "Expect:";
+
+  /* Fill in the file upload field. This makes libcurl load data from
+     the given file name when curl_easy_perform() is called. */
+  curl_formadd(&formpost,
+               &lastptr,
+               CURLFORM_COPYNAME, "sendfile",
+               CURLFORM_FILE, "multi-formadd.c",
+               CURLFORM_END);
+
+  /* Fill in the filename field */
+  curl_formadd(&formpost,
+               &lastptr,
+               CURLFORM_COPYNAME, "filename",
+               CURLFORM_COPYCONTENTS, "multi-formadd.c",
+               CURLFORM_END);
+
+  /* Fill in the submit field too, even if this is rarely needed */
+  curl_formadd(&formpost,
+               &lastptr,
+               CURLFORM_COPYNAME, "submit",
+               CURLFORM_COPYCONTENTS, "send",
+               CURLFORM_END);
+
+  curl = curl_easy_init();
+  multi_handle = curl_multi_init();
+
+  /* initialize custom header list (stating that Expect: 100-continue is not
+     wanted */
+  headerlist = curl_slist_append(headerlist, buf);
+  if(curl && multi_handle) {
+
+    /* what URL that receives this POST */
+    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
+    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+
+    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
+    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
+
+    curl_multi_add_handle(multi_handle, curl);
+
+    do {
+      CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
+
+      if(still_running)
+        /* wait for activity, timeout or "nothing" */
+        mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
+
+      if(mc)
+        break;
+
+    } while(still_running);
+
+    curl_multi_cleanup(multi_handle);
+
+    /* always cleanup */
+    curl_easy_cleanup(curl);
+
+    /* then cleanup the formpost chain */
+    curl_formfree(formpost);
+
+    /* free slist */
+    curl_slist_free_all(headerlist);
+  }
+  return 0;
+}