Parsing nulls with MID statement

When parsing a data stream with VB 5 and the MID statement, it refuses to pass back nulls (x'00'). I'm a mainframe Assembler programmer and it's very irritating to have the compiler decide what data I want/need to see. If a string contains "ABCD" + 3 nulls + "DEF" and I use Mid(x, i, 1) to examine each byte in the string, the 5th iteration doesn't give me the 1st of the 3 nulls. It skips over the nulls and passes back the "E" as if it were in the 5th position. Maddening. What should I be using instead of the MID statement to interrogate/manipulate every byte in the string?

Thanks
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