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Regarding callback registering for OpenNI in middleware framework

Basically I am trying to pack OpenNI Kinect into RT-middleware framework.
The OpenNI Kinect uses callback and has to be registered.

To do this, I could declare the callback functions and relevant variables in global without problem.

    // -----------------------------------------------     // Global     // ----------------------------------------------     // Declare OpenNI nodes     xn::Context g_Context;     xn::ScriptNode g_scriptNode;     xn::DepthGenerator g_DepthGenerator;     xn::UserGenerator g_UserGenerator;     // ... more codes          // Define callback functions     // Callback: New user was detected     void User_NewUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie)     {     	// ... some codes     	if (g_bNeedPose)     	{     		g_UserGenerator.GetPoseDetectionCap().StartPoseDetection(g_strPose, nId);     	}     	// ... some codes     }          // Callback: An existing user was lost     void User_LostUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie)     {     	// ... some codes     }          // -----------------------------------------------     // Member     // ----------------------------------------------     // Register callback functioins in the RT-middleware class (OOP)     RTC::ReturnCode_t rtc_kinect::onActivated(RTC::UniqueId ec_id)     {     	// ... some codes     	nRetVal = g_UserGenerator.RegisterUserCallbacks(User_NewUser, User_LostUser, NULL, hUserCallbacks);     	// ...
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Bryan A. Garner some codes     }

// ----------------------------------------------- // Global // ---------------------------------------------- // Declare OpenNI nodes xn::Context g_Context; xn::ScriptNode g_scriptNode; xn::DepthGenerator g_DepthGenerator; xn::UserGenerator g_UserGenerator; // ... more codes // Define callback functions // Callback: New user was detected void User_NewUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie) { // ... some codes if (g_bNeedPose) { g_UserGenerator.GetPoseDetectionCap().StartPoseDetection(g_strPose, nId); } // ... some codes } // Callback: An existing user was lost void User_LostUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie) { // ... some codes } // ----------------------------------------------- // Member // ---------------------------------------------- // Register callback functioins in the RT-middleware class (OOP) RTC::ReturnCode_t rtc_kinect::onActivated(RTC::UniqueId ec_id) { // ... some codes nRetVal = g_UserGenerator.RegisterUserCallbacks(User_NewUser, User_LostUser, NULL, hUserCallbacks); // ... some codes }

The above worked. However, using global variables and functions, I was told, is inappropriate.

I tried to move the callback functions and related variables as member of the middleware class, however been unsuccessful. The codes are:

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Elizabeth A. Cronkhite

    // ----------------------------------------     // private members     // ----------------------------------------     // Declare OpenNI nodes as member variables     xn::Context g_Context;     xn::ScriptNode g_scriptNode;     xn::DepthGenerator g_DepthGenerator;     xn::UserGenerator g_UserGenerator;     // ... more codes          // Define callback functions as member function     // Callback: New user was detected     void XN_CALLBACK_TYPE rtc_kinect::User_NewUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie)     {     	// ... some codes     	if (g_bNeedPose)     	{     		g_UserGenerator.GetPoseDetectionCap().StartPoseDetection(g_strPose, nId);     	}     	else     	{     		g_UserGenerator.GetSkeletonCap().RequestCalibration(nId, TRUE);     	}     }          // Callback: An existing user was lost     void XN_CALLBACK_TYPE rtc_kinect::User_LostUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie)     {     	// ... some codes     }          // Register callback functioins in the RT-middleware class     RTC::ReturnCode_t rtc_kinect::onActivated(RTC::UniqueId ec_id)     {     	// ... some codes     	nRetVal = g_UserGenerator.RegisterUserCallbacks(&rtc_kinect::User_NewUser, &rtc_kinect::User_LostUser, NULL, hUserCallbacks);     	// ... some codes     }

// ---------------------------------------- // private members // ---------------------------------------- // Declare OpenNI nodes as member variables xn::Context g_Context; xn::ScriptNode g_scriptNode; xn::DepthGenerator g_DepthGenerator; xn::UserGenerator g_UserGenerator; // ...<br style="clear:both;height:1px;overflow:hidden;"></span><span> more codes // Define callback functions as member function // Callback: New user was detected void XN_CALLBACK_TYPE rtc_kinect::User_NewUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie) { // ... some codes if (g_bNeedPose) { g_UserGenerator.GetPoseDetectionCap().StartPoseDetection(g_strPose, nId); } else { g_UserGenerator.GetSkeletonCap().RequestCalibration(nId, TRUE); } } // Callback: An existing user was lost void XN_CALLBACK_TYPE rtc_kinect::User_LostUser(xn::UserGenerator& generator, XnUserID nId, void* pCookie) { // ... some codes } // Register callback functioins in the RT-middleware class RTC::ReturnCode_t rtc_kinect::onActivated(RTC::UniqueId ec_id) { // ... some codes nRetVal = g_UserGenerator.RegisterUserCallbacks(&rtc_kinect::User_NewUser, &rtc_kinect::User_LostUser, NULL, hUserCallbacks); // ... some codes }

The following errors were reported by the compiler:

error C2664: 'xn::UserGenerator::RegisterUserCallbacks' : cannot convert parameter 1 from 'void (__stdcall rtc_kinect::* )(xn::UserGenerator &,XnUserID,void *)' to 'xn::UserGenerator::UserHandler' error C2664: 'xn::PoseDetectionCapability::RegisterToPoseDetected' : cannot convert parameter 1 from 'void (__stdcall rtc_kinect::* )(xn::PoseDetectionCapability &,const XnChar *,XnUserID,void *)' to 'xn::PoseDetectionCapability::PoseDetection'     .... and many more

error C2664: 'xn::UserGenerator::RegisterUserCallbacks' : cannot convert parameter 1 from 'void (__stdcall rtc_kinect::* )(xn::UserGenerator &,XnUserID,void *)' to 'xn::UserGenerator::UserHandler' error C2664: 'xn::PoseDetectionCapability::RegisterToPoseDetected' : cannot convert parameter 1 from 'void (__stdcall rtc_kinect::* )(xn::PoseDetectionCapability &,const XnChar *,XnUserID,void *)' to 'xn::PoseDetectionCapability::PoseDetection' .... and many more

This is one example of the definition of the callback registration function:

inline XnStatus RegisterUserCallbacks(UserHandler NewUserCB, UserHandler LostUserCB, void* pCookie, XnCallbackHandle& hCallback)     {     	// ... some codes     }

inline XnStatus RegisterUserCallbacks(UserHandler NewUserCB, UserHandler LostUserCB, void* pCookie, XnCallbackHandle& hCallback) { // ... some codes }

This an example of the typedef of the parameter 1:

typedef void (XN_CALLBACK_TYPE* UserHandler)(UserGenerator& generator, XnUserID user, void* pCookie);

typedef void (XN_CALLBACK_TYPE* UserHandler)(UserGenerator& generator, XnUserID user, void* pCookie);

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