curl_formadd() using example, the 7.9 style of building rfc1867 form posts

docs/examples/postit2.c

@@ -0,0 +1,92 @@
+/*****************************************************************************
+ *                                  _   _ ____  _     
+ *  Project                     ___| | | |  _ \| |    
+ *                             / __| | | | |_) | |    
+ *                            | (__| |_| |  _ <| |___ 
+ *                             \___|\___/|_| \_\_____|
+ *
+ * $Id$
+ *
+ * Example code that uploads a file name 'foo' to a remote script that accepts
+ * "HTML form based" (as described in RFC1738) uploads using HTTP POST.
+ *
+ * The imaginary form we'll fill in looks like:
+ *
+ * <form method="post" enctype="multipart/form-data" action="examplepost.cgi">
+ * Enter file: <input type="file" name="sendfile" size="40">
+ * Enter file name: <input type="text" name="filename" size="30">
+ * <input type="submit" value="send" name="submit">
+ * </form>
+ *
+ * This exact source code has not been verified to work.
+ */
+
+/* to make this work under windows, use the win32-functions from the
+   win32socket.c file as well */
+
+#include <stdio.h>
+#include <string.h>
+
+#include <curl/curl.h>
+#include <curl/types.h>
+#include <curl/easy.h>
+
+#if LIBCURL_VERSION_NUM < 0x070900
+#error "curl_formadd() is not introduced until libcurl 7.9 and later"
+#endif
+
+int main(int argc, char *argv[])
+{
+  CURL *curl;
+  CURLcode res;
+
+  struct HttpPost *formpost=NULL;
+  struct HttpPost *lastptr=NULL;
+  struct curl_slist *headerlist=NULL;
+  char buf[] = "Expect:";
+
+  /* Fill in the file upload field */
+  curl_formadd(&formpost,
+               &lastptr,
+               CURLFORM_COPYNAME, "sendfile",
+               CURLFORM_FILE, "postit2.c",
+               CURLFORM_END);
+
+  /* Fill in the filename field */
+  curl_formadd(&formpost,
+               &lastptr,
+               CURLFORM_COPYNAME, "filename",
+               CURLFORM_COPYCONTENTS, "postit2.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();
+  /* initalize custom header list (stating that Expect: 100-continue is not
+     wanted */
+  headerlist = curl_slist_append(headerlist, buf);
+  if(curl) {
+    /* what URL that receives this POST */
+    curl_easy_setopt(curl, CURLOPT_URL, "http://curl.haxx.se/examplepost.cgi");
+    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);
+  }
+  return 0;
+}