Hi everybody, I'm writting a tiny set o classes that uses
libflickrcurl to retrieve data from Flickr REST and libcurl to
download the images with the URL obtained from libflickrcurl. My
problem is that piece of code:

string FlickrPhoto::getThumbnailPath()
{
        FILE *image;
        char *tmp_filename;
        //void *buff;
        
        CURL *curl;
        CURLcode res;
        
        curl = curl_easy_init();
        if (curl)
        {
                curl_easy_setopt(curl, CURLOPT_URL, this -> thumbnailUrl.c_str());
                                        
                tmp_filename = new char[L_tmpnam+1];
                strcpy(tmp_filename,"/tmp/thumbXXXXXX");
                mkstemp(tmp_filename);
                this -> thumbnailPath = (string)tmp_filename;

                image = fopen(this -> thumbnailPath.c_str(),"wb");
                curl_easy_setopt(curl, CURLOPT_WRITEDATA, image);
                res = curl_easy_perform(curl);

                curl_easy_cleanup(curl);
        }
        fclose(image);
        return (this -> thumbnailPath);
}

Everything goes fine until it calls curl_easy_perform and I get a
segmentation fault error in some internal call to fwrite.

I've do some modifications in the code above to pass
CURLOPT_WRITEFUNCTION instead CURLOPT_WRITEDATA for the same purpose
but when I checked the buffer value received by the function it was
empty.

This code works fine when I pass no options to curl object and prints
the image data to stdio.

I'm running a Kubuntu/Ubuntu environment with libcurl 7.18.0 and g++ 4.2.3.

Thanks in advance.

-- 
Lucas Ces
Laboratório de Tecnologia da Informação Aplicada - LTIA
Universidade Estadual Paulista, Bauru - UNESP
+55 14 3011-1596 / +55 11 8319-1327
lucas.santos_at_ltia.fc.unesp.br
www.ltia.fc.unesp.br