怎么动态修改listControl的值

BOOL CALLBACK windowname(HWND hwnd,LPARAM IParam)

{

	if ( GetParent(hwnd)==NULL  &&  IsWindowVisible(hwnd) )  //判断是否顶层窗口并且可见

	{

		char WindowTitle[100];    

		::GetWindowText(hwnd,WindowTitle,100);

		CString s2="txt";

		if (_tcsstr((CString)WindowTitle,s2)!=NULL)

		{

		

			CZxSgDlg *pxdlg=(CZxSgDlg*)CDialog::FromHandle(hwnd);

			pxdlg->m_Ginfo.InsertItem(0,"1");

			pxdlg->m_Ginfo.SetItemText(0,1,"第一行");

			pxdlg->UpdateData(false);

		}

		

		

	}

 return true;   

		

}