98 строки
2.6 KiB
C
98 строки
2.6 KiB
C
/*****************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* $Id$
|
|
*
|
|
* Example source code to show how the callback function can be used to
|
|
* download data into a chunk of memory instead of storing it in a file.
|
|
*
|
|
* This exact source code has not been verified to work.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <curl/curl.h>
|
|
#include <curl/types.h>
|
|
#include <curl/easy.h>
|
|
|
|
struct MemoryStruct {
|
|
char *memory;
|
|
size_t size;
|
|
};
|
|
|
|
void *myrealloc(void *ptr, size_t size)
|
|
{
|
|
/* There might be a realloc() out there that doesn't like reallocing
|
|
NULL pointers, so we take care of it here */
|
|
if(ptr)
|
|
return realloc(ptr, size);
|
|
else
|
|
return malloc(size);
|
|
}
|
|
|
|
size_t
|
|
WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
|
|
{
|
|
register int realsize = size * nmemb;
|
|
struct MemoryStruct *mem = (struct MemoryStruct *)data;
|
|
|
|
mem->memory = (char *)myrealloc(mem->memory, mem->size + realsize + 1);
|
|
if (mem->memory) {
|
|
memcpy(&(mem->memory[mem->size]), ptr, realsize);
|
|
mem->size += realsize;
|
|
mem->memory[mem->size] = 0;
|
|
}
|
|
return realsize;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
CURL *curl_handle;
|
|
|
|
struct MemoryStruct chunk;
|
|
|
|
chunk.memory=NULL; /* we expect realloc(NULL, size) to work */
|
|
chunk.size = 0; /* no data at this point */
|
|
|
|
curl_global_init(CURL_GLOBAL_ALL);
|
|
|
|
/* init the curl session */
|
|
curl_handle = curl_easy_init();
|
|
|
|
/* specify URL to get */
|
|
curl_easy_setopt(curl_handle, CURLOPT_URL, "http://cool.haxx.se/");
|
|
|
|
/* send all data to this function */
|
|
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
|
|
|
|
/* we pass our 'chunk' struct to the callback function */
|
|
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
|
|
|
|
/* some servers don't like requests that are made without a user-agent
|
|
field, so we provide one */
|
|
curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, "libcurl-agent/1.0");
|
|
|
|
/* get it! */
|
|
curl_easy_perform(curl_handle);
|
|
|
|
/* cleanup curl stuff */
|
|
curl_easy_cleanup(curl_handle);
|
|
|
|
/*
|
|
* Now, our chunk.memory points to a memory block that is chunk.size
|
|
* bytes big and contains the remote file.
|
|
*
|
|
* Do something nice with it!
|
|
*
|
|
* You should be aware of the fact that at this point we might have an
|
|
* allocated data block, and nothing has yet deallocated that data. So when
|
|
* you're done with it, you should free() it as a nice application.
|
|
*/
|
|
|
|
return 0;
|
|
}
|