Error: segmentation fault

Aug 2, 2009 at 11:06pm

Hello people, I'm new to this community, but I'm also new to C++. I already know some programming languages so learning the basics of C++ was pretty easy, but I'm having a hard time figuring out why I'm getting a segmentation fault error.
I'm trying to make a libcurl wrapper to perform GET/POST HTTP requests easily... here's my code so far:

main.cpp:

#include <iostream>
#include "test.h"
#include <curl/curl.h>

using namespace std;

int main(int argc, char* argv[])
{
    /*CURL *curl = curl_easy_init();
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "http://www.google.com/");
    curl_easy_perform(curl);*/

    rickysWrapper* w = new rickysWrapper();
    cout << "worked" << endl;
    w->getRequest("http://www.google.com/\0");
    cout << "requested" << endl;
    delete(w);
    return 0;
}

Edit & run on cpp.sh

test.h:

#include <iostream>
#include <curl/curl.h>
#include <curl/easy.h>

class rickysWrapper
{
    public:
        rickysWrapper();
        ~rickysWrapper();
        std::string getRequest(char* url);
    protected:
    private:
        CURL *curl;

};

test.cpp:

#include "test.h"

#define DEBUG_OUTPUT true

rickysWrapper::rickysWrapper()
{
    //ctor
    curl_global_init(CURL_GLOBAL_ALL);
    this->curl = curl_easy_init();
    curl_easy_setopt(this->curl, CURLOPT_NOPROGRESS, 1);
    curl_easy_setopt(this->curl, CURLOPT_AUTOREFERER, 1);
    curl_easy_setopt(this->curl, CURLOPT_FOLLOWLOCATION, 1);
    curl_easy_setopt(this->curl, CURLOPT_ENCODING, "");
    curl_easy_setopt(this->curl, CURLOPT_NOSIGNAL, 1);
    if (DEBUG_OUTPUT)
        std::cout << "Debug: class initialized" << std::endl;
}

std::string rickysWrapper::getRequest(char* url)
{
    std::cout << "Started function" << std::endl;
    CURLcode result;
    std::cout << "Created result object" << std::endl;
    curl_easy_setopt(this->curl, CURLOPT_HTTPGET, 1);
    //std::cout << "Set HTTPGET" << std::endl;
    curl_easy_setopt(this->curl, CURLOPT_URL, url);
    std::cout << "Set url" << std::endl;
    result = curl_easy_perform(this->curl);
    std::cout << "processed!" << std::endl;

    std::cout << curl_easy_strerror(result) << std::endl;
}

rickysWrapper::~rickysWrapper()
{
    //dtor
    std::cout << "destroying" << std::endl;
    curl_easy_cleanup(this->curl);
    curl_global_cleanup();
    if (DEBUG_OUTPUT)
        std::cout << "Debug: class destroyed" << std::endl;
}

This code compiles just fine, it even runs as it should (it gets the page and outputs it to stdout) but as soon as the function rickysWrapper::getRequest ends, it throws a Segmentation Fault error.
Anyone who can help me, please?

Aug 3, 2009 at 9:22pm

ricky92 (2)

bump. Anyone who could help me?

Aug 4, 2009 at 3:04am

PanGalactic (1658)

When you say "as soon as the function ends", where exactly is it failing? Between what lines and why do you think that?

Have you run it in a debugger or generated a core file to find out where it is failing? What OS are you running on?

Aug 4, 2009 at 10:45pm

kempofighter (1183)

I don't see any problems with the code that would cause a segmentation fault but I don't know anything about this curl library that you are using. Perhaps this is more of a question for the curl message boards. Have you studied those APIs to ensure that you are using them correctly? Have you stepped into the code with a debugger, line, by line so that you can see specifically which line of code crashes?

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