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Wrapper Library for Windows MIDI API

, 28 Jan 2008
A small library encapsulating the Windows MIDI API
mididevdemo.zip
mididevdemo_v2.zip
MIDIDevDemo v2
MIDIDevDemo v2.clw
MIDIDevDemo v2.dsp
MIDIDevDemo v2.dsw
MIDIDevDemo v2.ncb
MIDIDevDemo v2.opt
MIDIDevDemo v2.plg
res
MIDIDevDemo v2.ico
midiwrapper.zip
midiwrappersource.zip
MIDIWrapper Source
midiwrapper_demo.zip
MIDIDevDemo v2.clw
MIDIDevDemo v2.dsp
MIDIDevDemo v2.dsw
MIDIDevDemo v2.ico
midiwrapper_source.zip
MIDIWrapper_Source
MIDIWrapper Source
midiwrapper_src.zip
// MIDIKeyboard.cpp : implementation file
//

#include "stdafx.h"
#include "MIDIDevDemo v2.h"
#include "MIDIKeyboard.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CMIDIKeyboard


// Low note end of the piano control range
const unsigned char CMIDIKeyboard::LOW_NOTE = 36;

// High note end of the piano control range
const unsigned char CMIDIKeyboard::HIGH_NOTE = 100;

// For determining if a key on the computer keyboard is already down
const unsigned short CMIDIKeyboard::KEY_DOWN = 16384;

// Note per octave
const unsigned char CMIDIKeyboard::NOTE_PER_OCTAVE = 12;

// Size of key map
const int CMIDIKeyboard::MAP_SIZE = 17;



CMIDIKeyboard::CMIDIKeyboard() :
m_KeyMap(MAP_SIZE),
m_Oct(0)
{
    //
    // Initialize key map for looking up keys and their note values
    //

    m_KeyMap.SetAt('Z', CPianoCtrl::C);
    m_KeyMap.SetAt('S', CPianoCtrl::C_SHARP);
    m_KeyMap.SetAt('X', CPianoCtrl::D);
    m_KeyMap.SetAt('D', CPianoCtrl::D_SHARP);
    m_KeyMap.SetAt('C', CPianoCtrl::E);
    m_KeyMap.SetAt('V', CPianoCtrl::F);
    m_KeyMap.SetAt('G', CPianoCtrl::F_SHARP);
    m_KeyMap.SetAt('B', CPianoCtrl::G);
    m_KeyMap.SetAt('H', CPianoCtrl::G_SHARP);
    m_KeyMap.SetAt('N', CPianoCtrl::A);
    m_KeyMap.SetAt('J', CPianoCtrl::A_SHARP);
    m_KeyMap.SetAt('M', CPianoCtrl::B);

    // An octave higher
    m_KeyMap.SetAt(0xBC, CPianoCtrl::C + NOTE_PER_OCTAVE);
    m_KeyMap.SetAt('L', CPianoCtrl::C_SHARP + NOTE_PER_OCTAVE);
    m_KeyMap.SetAt(0xBE, CPianoCtrl::D + NOTE_PER_OCTAVE);
    m_KeyMap.SetAt(0xBA, CPianoCtrl::D_SHARP + NOTE_PER_OCTAVE);
    m_KeyMap.SetAt(0xBF, CPianoCtrl::E + NOTE_PER_OCTAVE);
}

CMIDIKeyboard::~CMIDIKeyboard()
{
}


// Convert key to note
BOOL CMIDIKeyboard::KeyToNote(UINT Char, unsigned char &NoteId)
{
    BOOL Result = m_KeyMap.Lookup(Char, NoteId);

    if(Result)
    {
        NoteId += m_Oct * NOTE_PER_OCTAVE + LOW_NOTE;
    }

    return Result;
}


BEGIN_MESSAGE_MAP(CMIDIKeyboard, CWnd)
	//{{AFX_MSG_MAP(CMIDIKeyboard)
	ON_WM_GETDLGCODE()
	ON_WM_KEYDOWN()
	ON_WM_KEYUP()
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()	
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CMIDIKeyboard message handlers

UINT CMIDIKeyboard::OnGetDlgCode() 
{	
	return CWnd::OnGetDlgCode() | DLGC_WANTALLKEYS;
}


// When client presses a key
void CMIDIKeyboard::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	switch(nChar)
    {
    // Keys 1-5 are for determining the octave setting
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
        m_Oct = nChar - '1';
        break;

    default:
        // Make sure the key isn't already down
        if(!(nFlags & KEY_DOWN))
        {
            unsigned char NoteId;

            // If the key is in range of the piano control, play note
            if(KeyToNote(nChar, NoteId))
            {
                NoteOn(NoteId);
            }
        }
        break;
    }
	
	CWnd::OnKeyDown(nChar, nRepCnt, nFlags);
}


// Client lifts a key up
void CMIDIKeyboard::OnKeyUp(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	unsigned char NoteId;

    if(KeyToNote(nChar, NoteId))
    {
        NoteOff(NoteId);
    }
	
	CWnd::OnKeyUp(nChar, nRepCnt, nFlags);
}

//
// Messages passed to the parent control
//

void CMIDIKeyboard::OnPaint() 
{	
    CPianoCtrl::OnPaint();
}

void CMIDIKeyboard::OnLButtonDown(UINT nFlags, CPoint point) 
{
    CPianoCtrl::OnLButtonDown(nFlags, point);
}

void CMIDIKeyboard::OnLButtonUp(UINT nFlags, CPoint point) 
{
    CPianoCtrl::OnLButtonUp(nFlags, point);
}

void CMIDIKeyboard::OnMouseMove(UINT nFlags, CPoint point) 
{
    CPianoCtrl::OnMouseMove(nFlags, point);
}

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License

This article, along with any associated source code and files, is licensed under The MIT License

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About the Author

Leslie Sanford

United States United States
Aside from dabbling in BASIC on his old Atari 1040ST years ago, Leslie's programming experience didn't really begin until he discovered the Internet in the late 90s. There he found a treasure trove of information about two of his favorite interests: MIDI and sound synthesis.
 
After spending a good deal of time calculating formulas he found on the Internet for creating new sounds by hand, he decided that an easier way would be to program the computer to do the work for him. This led him to learn C. He discovered that beyond using programming as a tool for synthesizing sound, he loved programming in and of itself.
 
Eventually he taught himself C++ and C#, and along the way he immersed himself in the ideas of object oriented programming. Like many of us, he gotten bitten by the design patterns bug and a copy of GOF is never far from his hands.
 
Now his primary interest is in creating a complete MIDI toolkit using the C# language. He hopes to create something that will become an indispensable tool for those wanting to write MIDI applications for the .NET framework.
 
Besides programming, his other interests are photography and playing his Les Paul guitars.

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