C / C++ / MFC

void CTreeControlDlg::OnClickTree1(NMHDR* pNMHDR, LRESULT* pResult) 
{
    TRACE("OnClickTree1!\n");
 
    CPoint   pt;   
    GetCursorPos(&pt);   
    m_treeCtrl.ScreenToClient(&pt);   
    
    HTREEITEM   hItem   =   m_treeCtrl.HitTest(pt);
//     HTREEITEM hItem = m_treeCtrl.GetSelectedItem();
    if ( (hItem != NULL) && m_treeCtrl.ItemHasChildren(hItem))
    {    
        static BOOL bExpand = FALSE; // problem: when change to another COLLAPSE item, it will 
                                     // still do the Expand(hItem, TVE_COLLAPSE) code, but not
                                     // do the Expand(hItem, TVE_EXPAND) code.how can i change the
                                     // code? thank u!
        if (bExpand)
        {
            m_treeCtrl.Expand(hItem, TVE_COLLAPSE);
            bExpand = FALSE;
        }
        else
        {
            m_treeCtrl.Expand(hItem, TVE_EXPAND);        
            bExpand = TRUE;
        }
    }

	*pResult = 0;
}

BOOL bExpanded = m_treeCtrl.GetItemState (hItem, TVIS_EXPANDED) == TVIS_EXPANDED;

yes,my codes belows now. but i found another question now.it is:

for example the tree is:
--root1
  --subitem1
  --subitem2
--root2
  --subitem3

when the focus is on the root1 item,and now i change the focus from root1 to root2, the root2 item doesnot collapse at once, and i hit the item root2 again,it then collapse.and now, can i change the codes below to avoid it?
thank u!

void CTreeControlDlg::OnClickTree1(NMHDR* pNMHDR, LRESULT* pResult) 
{
    TRACE("OnClickTree1!\n");
 
    CPoint   pt;   
    GetCursorPos(&pt);   
    m_treeCtrl.ScreenToClient(&pt);   
    
    HTREEITEM   hItem   =   m_treeCtrl.HitTest(pt);
    if ( (hItem != NULL) && m_treeCtrl.ItemHasChildren(hItem))
    {   
        UINT nState = m_treeCtrl.GetItemState(hItem, TVIS_EXPANDED);
        if (nState & TVIS_EXPANDED)
        {
            m_treeCtrl.Expand(hItem, TVE_COLLAPSE);
        }
        else
        {
            m_treeCtrl.Expand(hItem, TVE_EXPAND);        
        }
    }

	*pResult = 0;
}

DWORD ExecuteProcess(LPCTSTR pCommandLine, LPCTSTR pDirectory = NULL, DWORD millisecondsTimeout = INFINITE)
{
	// _alloca allocates the memory on the stack, so I don't need to worry about cleaning it up
	// You could use new and then delete the buffer later
	TCHAR* pCmdLine = (TCHAR*) _alloca((lstrlen(pCommandLine) + 1) * sizeof(TCHAR));
	lstrcpy(pCmdLine, pCommandLine);

	STARTUPINFO startupInfo;
	memset(&startupInfo, 0, sizeof(startupInfo));
	startupInfo.cb = sizeof(startupInfo);

	PROCESS_INFORMATION processInfo;
	memset(&processInfo, 0, sizeof(processInfo));

	DWORD rval;

	if (CreateProcess(NULL, pCmdLine, NULL, NULL, FALSE, CREATE_DEFAULT_ERROR_MODE, NULL, pDirectory, &startupInfo, &processInfo))
	{
		rval = WaitForSingleObject(processInfo.hProcess, millisecondsTimeout);
	}
	else
	{
		rval = GetLastError();
	}

	CloseHandle(processInfo.hProcess);
	CloseHandle(processInfo.hThread);

	return rval;
}