Append to a binary file : binary file « File Stream « C++ Tutorial

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C++ Tutorial » File Stream » binary file 
12.3.9.Append to a binary file
#include <iostream>
#include <fstream>

using namespace std;

int main()
{
  ofstream outFile("FileWrite.out");

  if (outFile.fail()) {
    cerr << "Unable to open file for writing." << endl;
    exit(1);
  }

  outFile << "Hello!" << endl;

  outFile.close();

  ofstream appendFile("FileWrite.out", ios_base::app);

  if (appendFile.fail()) {
    cerr << "Unable to open file for writing." << endl;
    exit(1);
  }

  appendFile << "Append!" << endl;

  appendFile.close();
}
12.3.binary file
12.3.1.Open a binary file
12.3.2.Reading binary file
12.3.3.Open a binary file and read
12.3.4.Output a binary file in hexadecimal
12.3.5.Write Unformatted Binary Data to a File
12.3.6.Use read() to input blocks of binary data.
12.3.7.Use write() to output a block of binary data.
12.3.8.Creating a randomly accessed file
12.3.9.Append to a binary file
12.3.10.Unformatted and Binary I/O
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