Computer Science Canada

Binary reading
Author:  Ktomislav [ Sat Feb 14, 2009 12:41 pm ]
Post subject:  Binary reading
Is it possible to read file bit by bit to boolean?
Author:  wtd [ Sat Feb 14, 2009 1:19 pm ]
Post subject:  RE:Binary reading
You can read in individual bytes, then use bit-wise operators to access the individual bits.
Author:  Ktomislav [ Sat Feb 14, 2009 3:15 pm ]
Post subject:  Re: Binary reading
Can I do it like this?
code:
ifstream file ("example.bin", ios::in|ios::binary|ios::ate);
file.seekg (ios::beg);
char byte[1];
file.read (byte, 1);


And could you please explain me why do I have to use ios::ate and ios::beg instead of nothing or just ios::beg?
Author:  btiffin [ Sun Feb 15, 2009 12:05 am ]
Post subject:  RE:Binary reading
ios::ate will seek to end on open, so then ios::beg will be required to seek back to the beginning. If you don't set ate, you won't need the seek to beginning. If you have something like
code:

char charvar[1];
ifstream myfile;
myfile.open("filename", ios::in | ios::bin);
file.read(charvar, 1);

should work.

The fine control provided by the I/O stream flags and manipulators requires a fair level of understanding for optimal use.

http://www.cplusplus.com/doc/tutorial/files.html is a good read.

Cheers
Edit; yeah, more typos
Author:  Ktomislav [ Sun Feb 15, 2009 8:28 am ]
Post subject:  Re: RE:Binary reading
btiffin @ 15.2.2009, 06:05 wrote:

code:

char charvar[1];
ifstream myfile;
myfile.open("filename", ios::in | ios::bin);
file.read(charvar, 1);

should work.


I know, but it doesn't work. Never mind, I figured out what I needed and thank you for replying.

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