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Added 5.2 How can I receive all data into a large memory chunk?

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Daniel Stenberg 2000-11-22 07:27:26 +00:00
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docs/FAQ
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@ -1,4 +1,4 @@
Updated: October 27, 2000 (http://curl.haxx.se/docs/faq.shtml)
Updated: November 22, 2000 (http://curl.haxx.se/docs/faq.shtml)
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@ -48,6 +48,7 @@ FAQ
5. libcurl Issues
5.1 Is libcurl thread safe?
5.2 How can I receive all data into a large memory chunk?
6. License Issues
6.1 I have a GPL program, can I use the libcurl library?
@ -402,6 +403,40 @@ FAQ
README file from those who have used libcurl in a threaded environment,
since I haven't and I get this question more and more frequently!
5.2 How can I receive all data into a large memory chunk?
You are in full control of the callback function that gets called every time
there is data received from the remote server. You can make that callback do
whatever you want. You do not have to write the receivied data to a file.
One solution to this problem could be to have a pointer to a struct that you
pass to the callback function. You set the pointer using the
curl_easy_setopt(CURLOPT_FILE) function. Then that pointer will be passed to
the callback instead of a FILE * to a file:
/* imaginary struct */
struct MemoryStruct {
char *memory;
size_t size;
};
/* imaginary callback function */
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 *)realloc(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;
}
6. License Issues
Curl and libcurl are released under the MPL, the Mozilla Public License. To