//NOTE: Add winmm.lib in your link//

#include "dxstdafx.h"
#include <conio.h>     /* include for kbhit() and getch() functions */
#include <stdio.h>     /* for printf() function */
#include <windows.h>   /* required before including mmsystem.h */
#include <mmsystem.h>  /* multimedia functions (such as MIDI) for Windows */

int main(int argc, char** argv) {
   int ckey;           // storage for the current keyboard key being pressed
   int notestate = 0;  // keeping track of when the note is on or off
   int velocity = 100; // MIDI note velocity parameter value
   int midiport;       // select which MIDI output port to open
   int flag;           // monitor the status of returning functions
   int duration = 10;
   HMIDIOUT device;    // MIDI device interface for sending MIDI output

   // variable which is both an integer and an array of characters:
   union { unsigned long word; unsigned char data[4]; } message;

   // message.data[0] = command byte of the MIDI message, for example: 0x90
   // message.data[1] = first data byte of the MIDI message, for example: 60
   // message.data[2] = second data byte of the MIDI message, for example 100
   // message.data[3] = not used for any MIDI messages, so set to 0
   message.data[0] = 0x90;  // MIDI note-on message (requires to data bytes)
   message.data[1] = 96;    // MIDI note-on message: Key number (60 = middle C)
   message.data[2] = 100;   // MIDI note-on message: Key velocity (100 = loud)
   message.data[3] = 0;     // Unused parameter

   // Assign the MIDI output port number (from input or default to 0)
   if (argc < 2) {
      midiport = 0;
   } else {
      midiport = atoi(argv[1]);
   }

   printf("MIDI output port set to %d.\n", midiport);

   // Open the MIDI output port
   flag = midiOutOpen(&device, midiport, 0, 0, CALLBACK_NULL);
   if (flag != MMSYSERR_NOERROR) {
      printf("Error opening MIDI Output.\n");
      return 1;
   }

   // Main event loop
   printf("Press \"q\" to quit.\n");
   while (1) {         // event loop
      if (kbhit()) {   // If a key on the computer keyboard has been pressed 
         ckey = getch();
         if (notestate == 0) {
            // Note is currently off, turn on note.
	      message.data[3] = duration;
            message.data[2] = velocity;
            notestate = 1;
            printf("Note turned ON.\n");
         } else {
            // Note is currently on, turn off note.
            message.data[2] = 0;  // 0 velocity = note off
            notestate = 0;
            printf("Note turned OFF.\n");
         }
         flag = midiOutShortMsg(device, message.word);//THIS IS THE ONE WHICH PLAYS THE MIDI NOTE
         
		 if (flag != MMSYSERR_NOERROR) {
            printf("Warning: MIDI Output is not open.\n");
         }

         if (ckey == 'q') break;
      }
   }

   // turn any MIDI notes currently playing:
   midiOutReset(device);

   // Remove any data in MIDI device and close the MIDI Output port
   midiOutClose(device);

   return 0;
}