dev-cpp-users

[Julio L. <ju2...@ya...>]

Does anyone know why the following code for writing
class data to a file does not work? Is there something
wrong with the way the book wrote the code???

-Book example prog for writing/reading from binary
file
-------------------------------------------------------

 #include <fstream.h>
#include <stdlib.h>

class Animal
{
public:
	Animal(int weight, long
days):itsWeight(weight),itsNumberDaysAlive(days){}
	~Animal(){}

	int GetWeight()const { return itsWeight; }
	void SetWeight(int weight) { itsWeight = weight; }

	long GetDaysAlive()const { return 
itsNumberDaysAlive; }
	void SetDaysAlive(long days) { itsNumberDaysAlive =
days; }

private:
	int itsWeight;
	long itsNumberDaysAlive;
};

int main(int argc, char *argv[])   // returns 1 on
error
{
	if (argc != 2)
	{
		cout << "Usage: " << argv[0] << " <filename>" <<
endl;
		return(1);
	}

	ofstream fout(argv[1],ios::binary);
	if (!fout.good())
	{
		cout << "Unable to open " << argv[1] << " for
writing.\n";
		return(1);
	}

	Animal Bear(50,100);
	fout.write((char *)&Bear,sizeof(Bear));
	fout.close();

	ifstream fin(argv[1],ios::binary);
	if (!fin.good())
	{
		cout << "Unable to open " << argv[1] << " for
reading.\n";
		return(1);
	}

	Animal BearTwo(1,1);

	cout << "BearTwo weight: " << BearTwo.GetWeight() <<
endl;
	cout << "BearTwo days: " << BearTwo.GetDaysAlive() <<
endl;

	fin.read((char *)&BearTwo, sizeof(BearTwo));

	cout << "BearTwo weight: " << BearTwo.GetWeight() <<
endl;
	cout << "BearTwo days: " << BearTwo.GetDaysAlive() <<
endl;
	fin.close();
    system("PAUSE");
	return 0;
}

------------------------------------------------------
I would appreciate any help, I would like to get this
working so I can use it in one of my programs....


=====
Julio

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