在文本文件中的NULL字符中搜索字符串中的子字符串

Hey I wanted to search for a substring 'Step1' in a file and searched it wit my code. Although that file contains NULL characters (mostly HEX characters). With these Null characters in my file, my parser is failing and is returning a true. I have tried and searched a lot of material on replacing and removing the NULL characters, but all were in vain. This is my parser:Hey I wanted to search for a substring 'Step1'