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i want one socket to listen a tcp port and save recieve data in a file. printer send data to tcp port instead com or lpt.socket listen this port and save data (in string)in other file.plese guide me.

You need to write a driver level application , your driver application will install a driver on the system , when someone prints on this printer the data comes to ur application , then u can do whatever you want to do with the data
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You do not actually need to write a driver level app as any simple program can listen to a socket and save the data sent to it. However you may have difficulties interpreting what is sent to you if it is destined for a printer device.

Take a look at some of the articles on socket programming here on CodeProject for some samples.
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