How to get the value of a string when using the string in a hierarchical path

Hi all

        Is there a way to use the value of string variable in systemverilog.  I have a text file with the pin name and the value to be driven to that pin, on each line.

There are around 50 pins. The name of the pin declared in the interface and the text file are same. I want to read the pin name and value from text file into a string and integer.

Then use the string to refer the signal in interface and drive the value to it. The code i want to use is roughly as show below.

 The interface vif has pins pinabc and pinbcd declared in it. obviously here when i use vif.pin the tool is searching for a pin with name "pin" in interface. Is there a way to get

  the value of the string pin.

----------------file.txt-------------------------

 pinabc   20

 pinbcd   30

---------------sv code----------------------------------

   interger FILE,pin_val;

   string line,pin;

   FILE = $fopen("./file.txt","r");

  while ($fgets(line,FILE)) begin

      void'($sscanf(line,"%s %d\n",pin,pin_val));

      vif.pin = pin_val;

  end