Question

I am working on improving a stream reader class that uses a BinaryReader. It consists of a while loop that uses .PeekChar() to check if more data exists to continue processing.

The very first operation is a .ReadInt32() which reads 4 bytes. What if PeekChar only “saw” one byte (or one bit)? This doesn’t seem like a reliable way of checking for EOF.

The BinaryReader is constructed using its default parameters, which as I understand it, uses UTF8 as the default encoding. I assume that .PeekChar() checks for 8 bits but I really am not sure.

How many bits does .PeekChar() look for? (and what are some alternate methods to checking for EOF?)

Answer 1

Here BinaryReader.PeekChar

I read:

ArgumentException: The current character cannot be decoded into the
internal character buffer by using the Encoding selected for the
stream.

This makes clear that amount of memory read depends on Encoding applied to that stream.

EDIT

Actually definition according to MSDN is:

Returns the next available character and does not advance the
byte or character position.*

Infact, it depends on encoding if this is a byte or more…

Hope this helps.