静态函数和非静态变量

今天用定时器的时候出现下面的问题：

class CVideoSurveillance

｛

private:

static void __stdcall CAMERAALERT_TimerProc(void* lp);

 int CurrentID; 

｝

 

void __stdcall CVideoSurveillance::CAMERAALERT_TimerProc(void* lp)
{
 CVideoSurveillance *t = (CVideoSurveillance *)lp;
 WF_MSG* MSG;
 CMessagePool::GetInstance()->RequestMsg(&MSG);
 MSG->nMessageCode = WFMSG_VS_ALERT_GETSTATUS; //向V3(5)发送获取移动侦测消息
 MSG->lParam1 = t->CurrentID;  //MSG->lParam1 = CurrentID编译通不过
 MSG->lParam2 = 0; 
 t->PostMsg(MSG);
}

开始我写的是MSG->lParam1 = CurrentID

error C2597: illegal reference to non-static member 'CVideoSurveillance::CurrentID'
error C3867: 'CVideoSurveillance::CurrentID': function call missing argument list; use '&CVideoSurveillance::CurrentID' to create a pointer to member

 

因为CAMERAALERT_TimerProc是静态函数（静态函数是不能直接调用类的非静态变量），而由于类可以不实例化，则可调用静态函数，即可以不用CVideoSurveillance t; t->CAMERAALERT_TimerProc（）;而直接CVideoSurveillance::CAMERAALERT_TimerProc（）;调用静态函数。而对于类里的非静态成员函数或变量必须实例化后，才能调用，所以才出现刚刚的编译通不过。