Hello ShrishailHalijol, 1. >> But then, how do the Port Monitoring Tools (like one provided by Eltima) work? 1.1 Good commercial software which hooks the serial comm port would usually use a filter device driver that attaches itself to a serial port.

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Using ActiveXperts Serial Port Component with Visual Basic 6.x. ActiveXperts Serial Port Component is a software development kit (SDK) that enables the user to communicate to a device over a serial interface. Such a device can be: a weight indicator, a modem, a scanner, or any other device that is.

1.2 Client applications would generally have to perform the following: 1.2.1 Install the device driver to the system. 1.2.2 Obtain a handle to the device driver (this is achieved by a combined use of the CreateFile(), OpenSCManager(), OpenService() and StartService() APIs). 1.2.3 Communicate with the device driver by sending various IOCTL commands (this is done by calling the DeviceIoControl() API).

1.2.4 Receive events fired from the dvice driver (this is done by using DeviceIoControl() and WaitForMultipleObjects()). 1.2.5 Analyze the events which are usually connected with serial comm port activities (e.g. Comm port open/close read/write, etc). There is a good article on Dr Dobbs' Journal that provides a good implementation of such a filter device driver: 'A Serial Port Spy for NT' Source codes are provided. If I'm not wrong, the source codes for a sample user application are also provided. You would need WinDDK if you want to compile the device driver.

I hope the download will provide a ready built driver. The article is pretty old (1999) and was built for Windows NT. But the last time I checked, it still worked for Windows XP.

SetWindowsHookEx Function installs an application-defined hook procedure into a hook chain. You would install a hook procedure to monitor the system for certain types of events. These events are associated either with a specific thread or with all threads in the same desktop as the calling thread. For more information, please refer to the links Have a nice day! Cookie Luo[MSFT] MSDN Community Support Please remember to mark the replies as answers if they help and unmark them if they provide no help.

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>> But then, how do the Port Monitoring Tools (like one provided by Eltima) work? 1.1 Good commercial software which hooks the serial comm port would usually use a filter device driver that attaches itself to a serial port. 1.2 Client applications would generally have to perform the following: 1.2.1 Install the device driver to the system. 1.2.2 Obtain a handle to the device driver (this is achieved by a combined use of the CreateFile(), OpenSCManager(), OpenService() and StartService() APIs). 1.2.3 Communicate with the device driver by sending various IOCTL commands (this is done by calling the DeviceIoControl() API). 1.2.4 Receive events fired from the dvice driver (this is done by using DeviceIoControl() and WaitForMultipleObjects()). 1.2.5 Analyze the events which are usually connected with serial comm port activities (e.g.