mirror of
https://github.com/moparisthebest/curl
synced 2024-11-15 14:05:03 -05:00
fbefd816e4
1. Remove the comment warning that it's "not been verified to work". It works with no problems in my testing. 2. Remove 2 unnecessary includes. 3. Remove the myrealloc(). Initialize chunk.memory with malloc() instead of NULL. The comments for these two parts contradicted each other. 4. Handle out of memory from realloc() instead of continuing. 5. Print a brief status message at the end.
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*****************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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*
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* Example source code to show how the callback function can be used to
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* download data into a chunk of memory instead of storing it in a file.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <curl/curl.h>
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struct MemoryStruct {
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char *memory;
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size_t size;
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};
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static size_t
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WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
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{
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size_t realsize = size * nmemb;
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struct MemoryStruct *mem = (struct MemoryStruct *)data;
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mem->memory = realloc(mem->memory, mem->size + realsize + 1);
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if (mem->memory == NULL) {
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/* out of memory! */
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printf("not enough memory (realloc returned NULL)\n");
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exit(EXIT_FAILURE);
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}
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memcpy(&(mem->memory[mem->size]), ptr, realsize);
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mem->size += realsize;
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mem->memory[mem->size] = 0;
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return realsize;
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}
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int main(int argc, char **argv)
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{
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CURL *curl_handle;
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struct MemoryStruct chunk;
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chunk.memory = malloc(1); /* will be grown as needed by the realloc above */
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chunk.size = 0; /* no data at this point */
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curl_global_init(CURL_GLOBAL_ALL);
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/* init the curl session */
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curl_handle = curl_easy_init();
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/* specify URL to get */
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curl_easy_setopt(curl_handle, CURLOPT_URL, "http://cool.haxx.se/");
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/* send all data to this function */
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curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
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/* we pass our 'chunk' struct to the callback function */
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curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
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/* some servers don't like requests that are made without a user-agent
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field, so we provide one */
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curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
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/* get it! */
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curl_easy_perform(curl_handle);
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/* cleanup curl stuff */
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curl_easy_cleanup(curl_handle);
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/*
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* Now, our chunk.memory points to a memory block that is chunk.size
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* bytes big and contains the remote file.
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*
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* Do something nice with it!
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*
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* You should be aware of the fact that at this point we might have an
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* allocated data block, and nothing has yet deallocated that data. So when
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* you're done with it, you should free() it as a nice application.
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*/
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printf("%lu bytes retrieved\n", chunk.size);
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if(chunk.memory)
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free(chunk.memory);
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/* we're done with libcurl, so clean it up */
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curl_global_cleanup();
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return 0;
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}
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