cmidi

Related: doubles comparer - another powerful library for MetaTrader 5 traders.

A class to control the MIDI device is located in the incmidi.mqh file. The example of its use is represented in the emidi.mq5 file.

Also recommended: high-performance json library for llms - similar library with strong performance on MetaTrader 5.

The order of using the cmidi class:

Connect a file with a class:

- Declare a class.

- Transfer music program using the setmusic(string & amusic[]) method.

- Enable playback using the play(bool asynch=true) method. If asynch is true, play is performed in a synchronous mode in the cycle with pauses using the sleep() function. If asynch is false, play is performed in a synchronous mode, and you can stop play using the stop() method. To work in a synchronous mode from the onchartevent() function of the expert advisor, the chartevent() method must be called.

- Call the stop() method upon completion of work. This is necessary for the MIDI device closing; otherwise, to rerun it, you should restart the terminal.

Music program

Music program is recorded in the string array. In one array element, a list of actions is written. Actions are written with a comma. First, a command, an equal sign, and a command value are written. The following commands are available:

- tick: time in milliseconds through which all the commands of one array element will be performed. It defines the tempo of the play.

- volume: the volume level, from 0 to 100.

- volumel: the left channel volume level, from 0 to 100.

- volumer: the right channel volume level, from 0 to 100.

- instrument: selection of the music instrument, from 0 to 127.

- notedn: press a key. Number 60 corresponds to the 'do' note of the main octave, 61 to 'c sharp', 62 to 're', etc.

- noteup: release a key. For some instruments, you cannot use release a key, as the sound fades away itself, and for specific keys, pressing is obligatory. It is possible to take chords, e.g., 'notedn=57, notedn=60, notedn=64'. Parallel play on several instruments is possible, e.g., 'instrument=1, notedn=60, instrument=123, notedn=60'. Different instruments' volume cannot be changed, and all play at the same volume. However, you can change the volume of different parts of the playing, for example:

The cmidi class methods:

- void chartevent(const int id, const long &lparam, const double &dparam, const string &sparam) - called from the function when using play in an asynchronous mode.

- void play(bool asynch=true) - enable play. If asynch is false, from the onchartevent function, the chartevent() method must be called.

- void stop() - stop play in an asynchronous play. Stop play and close the device.

- void setmusic(string & amusic[]) - send an array with a music program.

- void seteventid(ushort aid) - set a number for a custom event. This is necessary when using play in an asynchronous mode. It is not necessary to call it; the default value is 1.

You may also like: the master windows library - excellent alternative for library users on MetaTrader 5.

#property copyright "robotfx"
#property link "https://robotfx.org"
#property version   "1.00"
#include <incmidi.mqh>
cmidi m;
int oninit(){
   string music1[]={
      "tick=150, volume=100, instrument=0",
      "notedn=62",
      "",

.......

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