Suppose, I have any object which neither get recorded nor even get Spy, so how we will manage that object or how to write a DP for that particular object.
I mean after using low level of recoding also, it does not record the object........
Determine what the object is and see if you need a corresponding add-in. Or try to interact with keyboard(tab positioning, sendkeys). As an absolute last resort, create a virtual object for it.
If you are facing this issue currently, do provide information on your application, the technology behind it, what control you are working with and the add-ins you are using with QTP.
Any low level recording will atleast identify the object as windows object, so not sure what is the issue in your case
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If it is the object on the web page you can refer to the source code of the page.
If it is C/S based application you'd better to get some information from the developers, or as Jonty said using virtual object.