i do not speak c++, cannot help you much, but i do not understand why you
want to call getResponse inside the callback. you did not tell us what
getResponse does.

allan

On Thu, Apr 6, 2006, Saikat Kanjilal <sxk1969_at_hotmail.com> said:

> Alan:
> Thanks for responding, my method that retrieves the response is defined
> currently as an extern method, I need to take the contents of the response
> and write this to a file. In order to do this I need access to the
> enclosing class, how do I get this access, listed below is the scenario:
>
> Header File:
> class A
> {
> public:
> bool getResponse();
> };
>
>
> Implementation
> bool A::getResponse(std::string response)
> {
> }
>
>
> extern "C" size_t httpWriteCallback(void *ptr, size_t size, size_t nmemb,
> void *data)
> {
> int realsize = size * nmemb;
> struct resp_struct *resp = (struct resp_struct *)data;
>
> //how do I access the class method here and call
> //getResponse, do I have access to the this pointer here
> if(!(resp->used)){
> resp->used = (realsize < resp->len) ? realsize : resp->len;
> memcpy(&resp->bytes, ptr, resp->used);
> resp->bytes[(resp->used)-1]=0;
> }
>
>
> }
>
>
> Thanks Again
> SK
>
>
>
>
>
>>From: <man_at_tfhs.net>
>>Reply-To: libcurl development <curl-library_at_cool.haxx.se>
>>To: "libcurl development" <curl-library_at_cool.haxx.se>
>>Subject: Re: Libcurl newbie question
>>Date: Thu, 6 Apr 2006 15:53:19 -0000
>>
>>On Thu, Apr 6, 2006, Saikat Kanjilal <sxk1969_at_hotmail.com> said:
>>
>> > Hi All:
>> > I have a client side app that does a simple http multipart post and
>>sends a
>> > file upto a server. I was wondering what the options are in libcurl to
>>read
>> > the response sent back by the server. The server is simply going to
>>send
>> > back a string, also some pros and cons of each option would be immensely
>> > valuable to me.
>>
>>i have a program that does this exact thing, here is what i use:
>>
>>#define MAX_RESP_LEN 512
>>struct resp_struct {
>> int used;
>> int len;
>> char bytes[MAX_RESP_LEN];
>>};
>>
>>size_t
>>httpWriteCallback(void *ptr, size_t size, size_t nmemb, void *data)
>>{
>> int realsize = size * nmemb;
>> struct resp_struct *resp = (struct resp_struct *)data;
>>
>> if(!(resp->used)){
>> resp->used = (realsize < resp->len) ? realsize : resp->len;
>> memcpy(&resp->bytes, ptr, resp->used);
>> resp->bytes[(resp->used)-1]=0;
>> }
>>
>> return realsize;
>>}
>>
>>in main()
>>
>> struct resp_struct resp = {0,MAX_RESP_LEN,{0}};
>>
>> if(curl_easy_setopt(mycurl, CURLOPT_WRITEFUNCTION, httpWriteCallback)){
>> fprintf(stderr,"CHILD: Could not add write callback: ERROR\n");
>> fprintf(stderr,"CHILD: %s\n",(char*)&error_buffer);
>> return(-1);
>> }
>>
>> if(curl_easy_setopt(mycurl, CURLOPT_WRITEDATA, (void *)&resp)){
>> fprintf(stderr,"CHILD: Could not add write pointer: ERROR\n");
>> fprintf(stderr,"CHILD: %s\n",(char*)&error_buffer);
>> return(-1);
>> }
>>
>>libcurl will call the callback multiple times, if the http response
>>requires it. my code only buffers the first call to the callback, and then
>>only the first 512 bytes of that call. after that it 'lies' to libcurl,
>>and says it did something with the data. that is enough for my use, as my
>>handler on the server side sends back a two word text response, and i have
>>never seen libcurl break that up over two calls to the callback. if that
>>ever happens, i am in trouble :)
>>
>>HTH
>>
>>allan
>>
>>--
>>m. allan noah
>>IT Director, TfHS.net
>>ph# (804) 355-5489
>>tf# (866) 724-9722
>>fx# (804) 355-0477
>>
>>
>
>
>

-- 
m. allan noah
IT Director, TfHS.net
ph# (804) 355-5489
tf# (866) 724-9722
fx# (804) 355-0477