Secondly, some essential technologies that used while developing the control, such as OLE, COM/DCOM, ActiveX, ATL and ADO are introduced respectively.

• 其次，介绍了开发ReportCtrl控件所涉及到的基本技术，包括OLE、COM/DCOM与ActiveX技术，开发工具ATL和ADO数据库访问技术等；