Need to add function to Existing C code

This project is simple and just to add Output to file function. This program simply queries Native Wifi for a list of Wireless Network Profiles which it then "parses" the resultant xml looking for the network key. I need that the results will be logged to txt file , with the use of command, example: Right now you run the program like this : c:\>wlan -d this will output list of networks with names and passwords on screen , i want this to be able to also output it to file with the use of -o as output command: c:\>wlan -d -o [login to view URL] that's it. source code will be delivered to winning bidder. feel free to ask any question.