_BLOCK_TYPE_IS_VALID(phead->nBlockUse).

/*static*/
LRESULT CALLBACK CAppInterface::DlgProc( HWND hwnd, UINT msg,WPARAM
wParam, LPARAM lParam )
{
    CAppInterface *p;

    if(msg == WM_INITDIALOG)
    {
        //Retrieve Window instance from window creation data and associate
        p= reinterpret_cast<CAppInterface *>(lParam);
        ::SetWindowLong( hwnd, GWL_USERDATA, (long)lParam );

                //Constructor
  p->_Analyse=new CAnalyse(p->_Avi._HwndC);<!!!!!!!!!!!!!!!!!!!
                // I can use dectructor here... so it works.
        delete(p->_Analyse);<!!!!!!!!!!!!!!!!!!!!!!
               //Constructor again
        p->_Analyse=new CAnalyse(p->_Avi._HwndC);<!!!!!!!!!!!!!!!!!!!!!!

    }
    p=WinGetLong<CAppInterface *>( hwnd, GWL_USERDATA);

    switch(msg){
        case WM_CLOSE:
            DestroyWindow(p->_Avi._HwndC);
            DestroyWindow(p->_Hwnd);
        break;

        case WM_DESTROY:
            PostQuitMessage(0);
        break;
    case WM_COMMAND:
            switch (LOWORD(wParam))
            {
                case BUTTON_START:
                                        // I can use method of CAnalyse
class object,but when i try to delete() it
                    p->_Analyse->LoadFrame(true);<!!!!!!!!!!!!!!!!!!!!!
                                        // i recice error
                                        //DEBUG ASSERTION FAILED!!
                                        // _BLOCK_TYPE_IS_VALID(...heap
pointer)...<!!!!!!!!!!!!!!!!!!!
                    delete(p->_Analyse); <!!!!!! THIS

                break;