Saving binary files

You've already learned that Processing can save data to a text file. In this recipe, we'll take a look at how you can write data to a binary file. This might be useful when you want to create your own proprietary file format.

How to do it...

You need to declare an integer array with a length of 1000 before the setup() function. When you run the sketch, this array will be filled with some random numbers representing uppercase and lowercase letters of the alphabet.

int[] numbers = new int[1000];
  
void setup()
{
  for ( int i = 0; i < numbers.length; i++ ) {
    if ( random( 100 ) < 50 ) {
      // uppercase A - Z
      numbers[i] = floor( random( 65, 91 ) );
    } else {
      // lowercase a - z
      numbers[i] = floor( random( 97, 123 ) );	
    }
  }
}

Inside the draw() function, we'll convert the integer array into a byte array and use the saveBytes() method to save the data to the hard drive.

void draw()
{
  if ( keyPressed ) {
    byte[] bytes = byte( numbers )...