It looks like WriteMemoryCallback is a member function of a C++ class. How
is this defined? It needs to have C linkage for the callback to work.
Normally when you want to callback into C++ member function, a C helper
function makes life easier, e.g.

/* header file */
extern "C"
{
size_t curl_write_data(void *buffer, size_t size, size_t nmemb, void
*userp);
}

/* impl */
size_t curl_write_data(void *buffer, size_t size, size_t nmemb, void
*userp)
{
        MyClass* p = reinterpret_cast<MyClass*>(userp);
        return p->write_data(buffer, size, nmemb);
}

You pass the 'this' into the CURLOPT_WRITEFILE argument and then your
helper function redirects it to the proper object member function.

Just a thought anyway. This is how I've setup the callbacks with C++ code
in the past and they work fine.

I have a issue with trying to get a call back function to work. For some
reason when WriteMemoryCallback is called a "The memory could not be read"
error occurs.

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Received on 2002-09-18