getReponse will update a configuration file with a value obtained from the
server, I guess I could just write to the file outside of the c++ code but I
was hoping for a way to get a handle back to the class from the C code

>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 18:04:30 -0000
>
>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
>
>
Received on 2006-04-06