launch a thread from a class

[dds]

Hi! I'm trying to launch some threads from an object with methods. I need the thread can access to some variable and synchronization parameter defined like atributes of the class. here is an example:

class CameraClass{
public:
//Constructor
CameraClass();
//Destructor
~CameraClass();

bool launchUpdate(DWORD Period){//begin frame QueueTimer
HANDLE hTimerQueue = NULL;
hTimerQueue = CreateTimerQueue();
CreateTimerQueueTimer( &hTimer,hTimerQueue
,receiverThread,0,0,
Period,WT_EXECUTEINTIMERTHREAD);
}

bool launchCalculation(){//begin frame processing thread
hreceivThread = CreateThread(NULL,0,receiverThread, (void*)&hnd, 0, NULL);
}
private:
HANDLE hcalcThread;
HANDLE hTimer;
//Events
static HANDLE g_newblock;//event new block
static HANDLE g_newdata;//envent new data
};

in the function timer I use g_newblock to synchronize the timer with the thread, but wen I complile i get this error:
error LNK2001: unresolved external symbol "private: static void * CameraClass::g_newdata"
any Idea?
thanks!

[kbw]

When you use class static member data, not only do you have to define it in the header file, you also must define it in the implementation.

Sample header file:

class Demo
{
    static int count;
};

Sample body:

#include "Demo.hpp"

int Demo::count = 3;