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