Newsgroups: comp.lang.c++
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From: kyt@cs.columbia.edu (Kok-Yong Tan)
Subject: Sucking in a mixture of int's and unsigned char's
Message-ID: <KYT.91May13055214@spruce.cs.columbia.edu>
Sender: news@cs.columbia.edu (The Daily News)
Organization: Columbia University Department of Computer Science
Distribution: comp.lang.c++
Date: 13 May 91 05:52:14

I'm trying to read in image data from a file in IMPROC format: the first 8
bytes are read in as two int's (the width and height of the image) and the rest
of the file consists of  width * height unsigned char's.

I've declared the following :

	ifstream InBuf(FileName, ios::nocreate);
	int Width;
	int Height;

and when I try to extract the first 8 bytes with:

	InBuf >> Width;
	InBuf >> Height;

I keep getting zeros when I know that it should be a 32 x 32 image and this
data is encoded in the first 8 bytes of the file.  I notice that 

	InBuf >> DataBuffer[Index]; // DataBuffer is declared as an array of
				    // unsigned char.

seems to work fine.  Since operator >> (int&) is defined, I would've thought
that the "InBuf >> Width" and "InBuff >> Height" would work similarly.  What
did I do wrong?  Thanks for any help.

 


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