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Added "5.14 Using C++ non-static functions for callbacks?"

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Daniel Stenberg 2008-09-24 07:39:42 +00:00
parent 82107a02f5
commit 22059858fe
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docs/FAQ
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Updated: Feb 18, 2008 (http://curl.haxx.se/docs/faq.html) Updated: Sep 24, 2008 (http://curl.haxx.se/docs/faq.html)
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5.11 How do I make libcurl not receive the whole HTTP response? 5.11 How do I make libcurl not receive the whole HTTP response?
5.12 Can I make libcurl fake or hide my real IP address? 5.12 Can I make libcurl fake or hide my real IP address?
5.13 How do I stop an ongoing transfer? 5.13 How do I stop an ongoing transfer?
5.14 Using C++ non-static functions for callbacks?
6. License Issues 6. License Issues
6.1 I have a GPL program, can I use the libcurl library? 6.1 I have a GPL program, can I use the libcurl library?
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If you're using the multi interface, you also stop a transfer by removing If you're using the multi interface, you also stop a transfer by removing
the particular easy handle from the multi stack. the particular easy handle from the multi stack.
5.14 Using C++ non-static functions for callbacks?
libcurl is a C library, it doesn't know anything about C++ member functions.
You can overcome this "limitation" with a relative ease using a static
member function that is passed a pointer to the class:
// f is the pointer to your object.
static YourClass::staticFunction(void *buffer, size_t sz, size_t n, void *f)
{
// Call non-static member function.
static_cast<YourClass*>(f)->nonStaticFunction();
}
// This is how you pass pointer to the static function:
curl_easy_setopt(hcurl, CURLOPT_WRITEFUNCTION, YourClass:staticFunction);
curl_easy_setopt(hcurl, CURLOPT_WRITEDATA, this);
6. License Issues 6. License Issues
Curl and libcurl are released under a MIT/X derivate license. The license is Curl and libcurl are released under a MIT/X derivate license. The license is