Read data from txt file into array

I am using TFileText to read data from txt(Unicode) file line by line and I need to save them into an array.
The structure of the txt file is as follows:

Index, attribute1, attribute2

The real contexts are:

-1 12 1
-23 14 14
...

I need to save them in an arra, because I will receive some hex data

for example:

0x31

I need to search the array to find the 1 that 0x31 represents. So the question is what type of array shall i use and what the type of the element of that array shall i declare.

Anyone can help?