C Interview Questions and Answers

 

How can I read a binary data file properly?

How can I read a binary data file properly? I'm occasionally seeing 0x0a and
0x0d values getting garbled, and I seem to hit EOF prematurely if the data contains
the value 0x1a.





When you're reading a binary data file, you should specify "rb" mode
when calling fopen, to make sure that text file translations do not occur. Similarly,
when writing binary data files, use "wb". (Under operating systems such
as Unix which don't distinguish between text and binary files, "b"
may not be required, but is harmless.)



Note that the text/binary distinction is made when you open the file: once a file
is open, it doesn't matter which I/O calls you use on it.

Posted by:Richards