Here is my current C-Code (because I have switched from C++ to C):

Still the same error. Is there some mistake I made?

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <sstream>
#include <string.h>
#include <curl/curl.h>

using namespace std;

//********************************************************************************************
//
// writer
//
// This is the writer call back function used by curl

static int writer(char* data, size_t size, size_t nmemb, char* buffer)
{
        // What we will return
        int result = 0;

        // Is there anything in the buffer?
        if (buffer != NULL)
        {
                // Append the data to the buffer
                strcat(buffer, data);

                // How much did we write?
                result = size * nmemb;
        }

        return result;
}

//********************************************************************************************
//
// http_call
//
// Ruft eine URL auf und gibt im Fehlerfall false zurück.

static bool http_call (void) {
        CURL *curl;

        curl = curl_easy_init();
        if(curl) {
                // Infos: http://us3.php.net/curl_setopt

                // URL übergeben
                curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/");

                // Keine Kopfzeile einblenden
                curl_easy_setopt(curl, CURLOPT_HEADER, false);

                // Verbindung danach beenden
                curl_easy_setopt(curl, CURLOPT_FORBID_REUSE, true);

                // Pufferoptionen
                curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writer);
                char errorBuffer[CURL_ERROR_SIZE];
                curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errorBuffer);
                char* buffer;
                curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer);

                // Benutzerdefinierter User-Agent-Name
                curl_easy_setopt(curl, CURLOPT_USERAGENT, "Hello World Browser");

                // Einen Timeout setzen
                curl_easy_setopt(curl, CURLOPT_TIMEOUT, 1);

                // Weiterleitungen beachten, aber nur max. 50x
                curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, true);
                curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 50);

                // Einen HTTP-Fehler-Statuscode beachten
                curl_easy_setopt(curl, CURLOPT_FAILONERROR, true);

                // SSL-Zertifikate nicht prüfen (Warnung! Sicherheitslücke)
                // http://ademar.name/blog/2006/04/curl-ssl-certificate-problem-v.html
                curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, false);
                curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);

                // Abfrage ausführen und Resultat speichern
                CURLcode res;
                res = curl_easy_perform(curl);

                // Clean up
                curl_easy_cleanup(curl);

                // Alles OK?
                if (res == CURLE_OK)
                {
                        return true;
                }
                else
                {
                        return false;
                }
        } else return false;
}

int main(void) {
        while (true) {
                cout << "A" << ::std::endl;
                http_call();
                sleep(2);
        }
        return 0;
}

--------------------------------------------------
From: "Daniel Marschall" <info_at_daniel-marschall.de>
Sent: Wednesday, February 04, 2009 4:32 PM
To: "libcurl development" <curl-library_at_cool.haxx.se>
Subject: Re: cURL bug -- Segmentation Fault when timeout is 1 second

> In my C-Adaption I replaced the "string buffer" with a "char* buffer" and
> rewrote the writer-function. Also there, the bug appears. And: I copied
> the code from the offical size, so it cannot be my fault. So, is there a
> bug in my code?
>
> --------------------------------------------------
> From: "Gisle Vanem" <gvanem_at_broadpark.no>
> Sent: Wednesday, February 04, 2009 7:08 AM
> To: "libcurl development" <curl-library_at_cool.haxx.se>
> Subject: Re: cURL bug -- Segmentation Fault when timeout is 1 second
>
>>> ... * snip *
>>>>
>>>> string buffer; curl_easy_setopt(curl, CURLOPT_WRITEDATA,
>>>> &buffer);
>>> .... * snip *
>>>>
>>>> http_call(); sleep(2);
>>>
>>
>> Daniel Marschall <info_at_daniel-marschall.de> wrote:
>>
>>> No, I cannot see what could be wrong there. I call the URL and wait 2
>>> seconds.
>>
>> At first look it seemed you were using a variable on stack in a
>> global scope (while sleep() is running). But as Daniel saids, you cannot
>> pass a 'std::string' to CURLOPT_WRITEDATA.
>>
>> --gv
>>
>
Received on 2009-02-04