On Mar 10, 2005, at 12:16 PM, Olenhouse, Jason wrote:

I'm trying to pass a member function pointer around to the Windows Service Control Manager through Windpws API functions, but I think I'm having troubles with the __stdcall convention.

I'm using MSVC 7.1.3088. For brevity I've left out information, but I think this is enough to go on:

__ExampleClass.h__ class ExampleClass { protected: void Setup( void ); void __stdcall ServiceMain( DWORD dwArgc, LPSTR *lpszArgv ); LPSERVICE_MAIN_FUNCTION m_fServiceMain; };

__ExampleClass.cpp__ void ExampleClass::Setup( void ) { boost::function f2 = boost::bind( boost::mem_fn( &ExampleClass::ServiceMain ), this, _1, _2 ); m_fServiceMain = f2.target( );

There seem to be two issues here. The first issue is that function::target() does something different than what you're trying to do. function::target<T>() will return a pointer to a T. If the actual object stored by the instance of boost::function has type T, you get the pointer; otherwise, you get a NULL pointer. If the code above had worked, m_fServiceMain would get a NULL pointer, because the type of the bind expression in the line before it is something big, ugly, and very hard to reproduce (but it can't be void(DWORD, LPSTR*)). The second issue is that void(DWORD, LPSTR*) is probably not the type you want, because it is not the type of a function object. To extract a function pointer, you would use, e.g., "void (*)(DWORD, LPSTR*) ". I'm sure the __stdcall needs to be in that type somewhere, but I don't know where it would go :( Doug