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Read Write Binary File

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Last Modified: 2012-08-14
I need an example of source code that will rad and write a binary file that consistes of a header followed by an unknown number of records (structures of data)
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Below is an example in C++:
#include <iostream>
#include <fstream>
 
using namespace std;
 
// Declare a data structure
struct DataStruct
{
	char header[256];
	int age;
	double income;
};
 
int main()
{
	// Instantiate an instance of the data structure
	DataStruct myDS;
 
	// Initialize the values in the data structure
	strcpy(myDS.header, "Header Title");
	myDS.age = 75;
	myDS.income = 20000.5;
 
	// Specify the location of the data file
	const char * DATA_FILE = "C:\\binaryfile.bin";
 
	// Create an output stream, binary mode
	ofstream os(DATA_FILE, ios_base::out | ios_base::binary);
 
	// Check if the output stream is open
	if(os.is_open()) {
 
		// Write the data structure to the file, 
		//  you would use a loop if you have a multiple records
		os.write((char *)&myDS, sizeof(myDS));
	}
 
	// Close the output stream
	os.close();
 
	// Instantiate an empty data structure
	DataStruct emptyDS;
 
	// Create an input file stream, binary mode
	ifstream is(DATA_FILE, ios_base::in | ios_base::binary);
 
	// Check if the input stream is open
	if(is.is_open()) {
 
		// Read the data from the file,
		//  you would use a loop if you have a multiple records
		is.read((char *)&emptyDS, sizeof(emptyDS));
	}
 
	// Close the output stream
	is.close();
 
	// Display the read data on the screen
	cout << "READ DATA" << endl;
	cout << "Header:\t" << emptyDS.header << endl;
	cout << "Age:\t" << emptyDS.age << endl;
	cout << "Income:\t" << emptyDS.income << endl;
 
	// Pause the display to see the data, press any key to exit
	system("pause");
 
	return(0);
}

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