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Annotation of embedaddon/curl/docs/examples/postinmemory.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
                      9:  *
                     10:  * This software is licensed as described in the file COPYING, which
                     11:  * you should have received as part of this distribution. The terms
                     12:  * are also available at https://curl.haxx.se/docs/copyright.html.
                     13:  *
                     14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
                     15:  * copies of the Software, and permit persons to whom the Software is
                     16:  * furnished to do so, under the terms of the COPYING file.
                     17:  *
                     18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
                     19:  * KIND, either express or implied.
                     20:  *
                     21:  ***************************************************************************/
                     22: /* <DESC>
                     23:  * Make a HTTP POST with data from memory and receive response in memory.
                     24:  * </DESC>
                     25:  */
                     26: #include <stdio.h>
                     27: #include <stdlib.h>
                     28: #include <string.h>
                     29: #include <curl/curl.h>
                     30: 
                     31: struct MemoryStruct {
                     32:   char *memory;
                     33:   size_t size;
                     34: };
                     35: 
                     36: static size_t
                     37: WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
                     38: {
                     39:   size_t realsize = size * nmemb;
                     40:   struct MemoryStruct *mem = (struct MemoryStruct *)userp;
                     41: 
                     42:   char *ptr = realloc(mem->memory, mem->size + realsize + 1);
                     43:   if(!ptr) {
                     44:     /* out of memory! */
                     45:     printf("not enough memory (realloc returned NULL)\n");
                     46:     return 0;
                     47:   }
                     48: 
                     49:   mem->memory = ptr;
                     50:   memcpy(&(mem->memory[mem->size]), contents, realsize);
                     51:   mem->size += realsize;
                     52:   mem->memory[mem->size] = 0;
                     53: 
                     54:   return realsize;
                     55: }
                     56: 
                     57: int main(void)
                     58: {
                     59:   CURL *curl;
                     60:   CURLcode res;
                     61:   struct MemoryStruct chunk;
                     62:   static const char *postthis = "Field=1&Field=2&Field=3";
                     63: 
                     64:   chunk.memory = malloc(1);  /* will be grown as needed by realloc above */
                     65:   chunk.size = 0;    /* no data at this point */
                     66: 
                     67:   curl_global_init(CURL_GLOBAL_ALL);
                     68:   curl = curl_easy_init();
                     69:   if(curl) {
                     70:     curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.org/");
                     71: 
                     72:     /* send all data to this function  */
                     73:     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
                     74: 
                     75:     /* we pass our 'chunk' struct to the callback function */
                     76:     curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
                     77: 
                     78:     /* some servers don't like requests that are made without a user-agent
                     79:        field, so we provide one */
                     80:     curl_easy_setopt(curl, CURLOPT_USERAGENT, "libcurl-agent/1.0");
                     81: 
                     82:     curl_easy_setopt(curl, CURLOPT_POSTFIELDS, postthis);
                     83: 
                     84:     /* if we don't provide POSTFIELDSIZE, libcurl will strlen() by
                     85:        itself */
                     86:     curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(postthis));
                     87: 
                     88:     /* Perform the request, res will get the return code */
                     89:     res = curl_easy_perform(curl);
                     90:     /* Check for errors */
                     91:     if(res != CURLE_OK) {
                     92:       fprintf(stderr, "curl_easy_perform() failed: %s\n",
                     93:               curl_easy_strerror(res));
                     94:     }
                     95:     else {
                     96:       /*
                     97:        * Now, our chunk.memory points to a memory block that is chunk.size
                     98:        * bytes big and contains the remote file.
                     99:        *
                    100:        * Do something nice with it!
                    101:        */
                    102:       printf("%s\n",chunk.memory);
                    103:     }
                    104: 
                    105:     /* always cleanup */
                    106:     curl_easy_cleanup(curl);
                    107:   }
                    108: 
                    109:   free(chunk.memory);
                    110:   curl_global_cleanup();
                    111:   return 0;
                    112: }