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介绍了一种自行开发的微机并行口通信控件，它是在VisualC++5.0环境下，利用ActiveX技术开发的。该控件弥补了Visual Basic中对并行口通信控件的不足。文中以信号频率测量为例说明并行口通信控件的创建与应用。“,”A self--designed control of PC parallel port communication is introduced in this paper. Taking advantage of the MFC ActiveX technology,it is developed in Visual C++ and offset the scarcity of the control of PC parallel port communication. An example of frequency measurement shows the detail procedure and application of the control.