Read IP address from linux file system

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Linux

Ubuntu

Is there a way to read dynamic IP address from ubuntu linux file, without using commands like ifconfig etc.. ie Read directly from a file.

I am developing an application in linux that need to use the ip address dynamically assigned by the DHCP server. I know I can access the IP address from "etc\network\interfaces" if the ip address is static but how I will get the IP address if the IP address is dynamic. I am not intersted to use commandline tools. I prefer to read directly from a file.