On Fri, Oct 29, 2010 at 12:12:06PM +0530, Lloyd wrote:

We have a class and it has a member function. When this function is called, it calls a Windows API. One of the argument of the windows API is a callback function. Naturally this callback function has to be a *non member* function. Is there any way by which I can pass a *member* function in the place of callback function. I heard about boost::bind, with bind is it possible?

No. Boost.Bind does not offer any such functionality, and I do not believe there are any libraries in Boost that have anything like that in their public interfaces. The common approach is to generate code that translates from the thiscall calling convention to stdcall. There might be third party libraries that can do this, but I'm unsure if it's possible at all on x64, if that matters. The other common solutions is to have a global pointer to your instance and use that from a static member function, or pass in a context to the API function that your callback will be invoked with. Other solutions are things like storing data in extra bytes of windows, or other fun target-dependant solutions. -- Lars Viklund | zao@acc.umu.se

On Fri, Oct 29, 2010 at 2:42 AM, Lloyd <lloyd@cdactvm.in> wrote: We have a class and it has a member function. When this function is called,

it calls a Windows API. One of the argument of the windows API is a callback function. Naturally this callback function has to be a *non member* function. Is there any way by which I can pass a *member* function in the place of callback function. I heard about boost::bind, with bind is it possible?

The key question is: does the Windows function also accept, and pass to your callback, a void* data pointer so you can supply the callback function with arbitrary data? (That idiom is quite common with classic C callbacks.) If so, there are a number of different ways to get what you want here. Please see the attached, which compiles and runs for me.

For 32-bit code, use this: <http://www.dlugosz.com/Repertoire/refman/Classics/closure.html#toptop> It will create an actual C-like function pointer that can be called by code expecting such. This specifically includes the WinProc and any of the Enum... API functions in Windows. --John From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Lloyd Sent: Friday, October 29, 2010 1:42 AM To: boost-users@lists.boost.org Subject: [Boost-users] Windows API callback, using boost::bind hi, We have a class and it has a member function. When this function is called, it calls a Windows API. One of the argument of the windows API is a callback function. Naturally this callback function has to be a *non member* function. Is there any way by which I can pass a *member* function in the place of callback function. I heard about boost::bind, with bind is it possible? Thanks, Lloyd ______________________________________ Scanned and protected by Email scanner TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.