Talmai Oliveira

As a TA assignment I needed to read binary files straight from cin using C++ on windows. Although at first this seems like an extremely easy task, it is a bit more complex than what I expected. Anyhow, eventually I got it to work. This code sample counts the number of characters in each line. Arguably, the concept of a “line” is thin, so it’s either 100 bytes or eof(). Makes sense?

#include "stdafx.h"
#include
#include
#include
#include  //_O_BINARY
#include  //_setmode
using namespace std;
int _tmain(int argc, _TCHAR* argv[]) {
	char temp[100];
	int readBufSize;
	int max = -1;
	int min = 1000;
	int total_number_bytes = 0;
	bool done = false;
	// see: http://tinyurl.com/clzq6m
	if (_setmode(_fileno(stdin), _O_BINARY) == -1)
		cout << "ERROR: cin to binary:" << strerror(errno);
	while (!done)
	{
	 cin.read(temp, sizeof(temp));
	 readBufSize = cin.gcount();
/*
	 for (int i=0; i {
		cout.setf(ios::hex, ios::basefield);
		cout << (int) temp[i] << endl;
		cout.setf(ios::dec, ios::basefield);
	 }
*/
	 max = (readBufSize > max)?readBufSize:max;
	 min = (readBufSize < min)?readBufSize:min;
	 total_number_bytes += readBufSize;
	 if(cin.fail() || cin.bad() || cin.eof()) {
		if (cin.eof()) done = true;
		cin.clear();
	 }
	}
	cout << "MAX: " << max <<
                " MIN: " << min <<
		" TOTAL: " << total_number_bytes;
	return 0;
}

To run it it would do something like: prog.exe < file.jpg. Any suggestions or comments? Drop me a line.