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From: Dan Fandrich <>
Date: Wed, 4 May 2005 11:38:15 -0700

On Wed, May 04, 2005 at 01:47:10PM -0400, Cris D Putnam wrote:
> You said:
> Write a "C" function that serves as a wrapper function, and use
> function to the former, and a pointer to your class object to the
> latter.
> I am not sure how to do that? Hear is my class constructor which is supposed to
> store the html in a string. Do you mean put CURLOPT_WRITEFUNCTION and
> CURLOPT_WRITEDATA in a separate function?
> curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback );
> // we pass our 'chunk' struct to the callback function
> curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);

Presumably, WriteMemoryCallback is a non-static method on your getHtml object.
libcurl doesn't know what to do with C++ methods, so you have to pass in a
C function pointer instead (or, perhaps, a static C++ method pointer).
You would then pass the 'this' pointer into CURLOPT_WRITEDATA and your
C function would then cast that back to an object and call the
WriteMemoryCallback method on that.

There is a C++ binding to libcurl available called cURLpp that may make your
life easier as it hides libcurl's C nature from you. See

>>> Dan

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Received on 2005-05-04