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Wrapper Library for Windows MIDI API

, 28 Jan 2008 MIT
A small library encapsulating the Windows MIDI API
mididevdemo.zip
MIDIDeviceDemo.exe
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
MIDIDeviceDemo.zip
MIDIWrapperSrc.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
// DemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "MIDIDevDemo v2.h"
#include "DemoDlg.h"
#include "ShortMsg.h"
#include "midi.h"
#include "MIDIDevsDlg.h"

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


/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDemoDlg dialog


CDemoDlg::CDemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CDemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CDemoDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}


CDemoDlg::~CDemoDlg()
{
    if(m_InDevice.IsOpen())
    {
        if(m_InDevice.IsRecording())
        {
            m_InDevice.StopRecording();
        }   

        m_InDevice.Close();
    }

    if(m_OutDevice.IsOpen())
    {
        m_OutDevice.Close();
    }
}


// Note-on event notification
void CDemoDlg::OnNoteOn(CPianoCtrl &PianoCtrl, unsigned char NoteId)
{
    midi::CShortMsg ShortMsg(midi::NOTE_ON, 0, NoteId, 127, 0);
    ShortMsg.SendMsg(m_OutDevice);
}


// Note-off event notification
void CDemoDlg::OnNoteOff(CPianoCtrl &PianoCtrl, unsigned char NoteId)
{
    midi::CShortMsg ShortMsg(midi::NOTE_OFF, 0, NoteId, 0, 0);
    ShortMsg.SendMsg(m_OutDevice);
}


// Receives MIDI short message
void CDemoDlg::ReceiveMsg(DWORD Msg, DWORD TimeStamp)
{
    midi::CShortMsg ShortMsg(Msg, TimeStamp);
    unsigned char Command = ShortMsg.GetCommand();
    CString Text;

    // Display command value
    Text.Format("%d", ShortMsg.GetCommand());
    m_Command.SetWindowText(Text);

    // Display channel value
    Text.Format("%d", ShortMsg.GetChannel());
    m_Channel.SetWindowText(Text);

    // Display data byte 1 value
    Text.Format("%d", ShortMsg.GetData1());
    m_Data1.SetWindowText(Text);

    // Display data byte 2 value
    Text.Format("%d", ShortMsg.GetData2());
    m_Data2.SetWindowText(Text);
    
    // 
    // If this is a note-on or note-off event, notify piano control so
    // that it can update its display
    //

    if(Command == midi::NOTE_ON && ShortMsg.GetData2() > 0)
    {
        unsigned char Note = ShortMsg.GetData1();

        // Range checking
        if(Note >= m_Keys.GetLowNote() && 
            Note <= m_Keys.GetHighNote())
        {
            m_Keys.NoteOn(Note);
        }
    }
    else if(Command == midi::NOTE_OFF || (Command == midi::NOTE_ON && 
        ShortMsg.GetData2() == 0))
    {
        unsigned char Note = ShortMsg.GetData1();

        // Range checking
        if(Note >= m_Keys.GetLowNote() && 
            Note <= m_Keys.GetHighNote())
        {
            m_Keys.NoteOff(Note);
        }
    }
}


// Receives an erroneous short message
void CDemoDlg::OnError(DWORD Msg, DWORD TimeStamp)
{
    MessageBox("An illegal MIDI short message was received.", "Error",
        MB_ICONSTOP | MB_OK);
}


void CDemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CDemoDlg)
		DDX_Control(pDX, IDC_GM_LIST, m_GMCombo);
        DDX_Control(pDX, IDC_COMMAND, m_Command);
        DDX_Control(pDX, IDC_CHANNEL, m_Channel);
        DDX_Control(pDX, IDC_DATA1, m_Data1);
        DDX_Control(pDX, IDC_DATA2, m_Data2);
	//}}AFX_DATA_MAP
    DDX_Control(pDX, IDC_MIDI_KEYS, m_Keys);
}

BEGIN_MESSAGE_MAP(CDemoDlg, CDialog)
	//{{AFX_MSG_MAP(CDemoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_COMMAND(ID_PREF_NOTE_COLOR, OnPrefNoteColor)
	ON_COMMAND(ID_PREF_MIDIDEVICES, OnPrefMididevices)
	ON_COMMAND(ID_FILE_EXIT, OnFileExit)
    ON_CBN_SELCHANGE(IDC_GM_LIST, OnSelchangeGmList)
	ON_COMMAND(ID_HELP_ABOUT, OnHelpAbout)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDemoDlg message handlers

BOOL CDemoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
    // Initialize piano control
    m_Keys.Initialize(CMIDIKeyboard::LOW_NOTE, CMIDIKeyboard::HIGH_NOTE);

    // Attach ourselves to the piano control so that we will be notified
    // when note-on and note-off events occur
    m_Keys.AttachListener(*this);

    // Initialize General MIDI combo box
    m_GMCombo.SetCurSel(0);
    
    // Attempt to open MIDI input and output devices
    try
    {
        // If there are any MIDI output devices available, open one.
        if(midi::CMIDIOutDevice::GetNumDevs() > 0)
        {
            m_OutDevice.Open(0);
        }
        // Else there are no MIDI output devices available.
        else
        {
            MessageBox("No MIDI output devices available.", "Warning", 
                MB_ICONWARNING | MB_OK);
        }

        // If there are any MIDI input devices available, open one and begin
        // recording.
        if(midi::CMIDIInDevice::GetNumDevs() > 0)
        {
            m_InDevice.SetReceiver(*this);
            m_InDevice.Open(0);
            // Start receiving MIDI events
            m_InDevice.StartRecording();           
        }
        // Else there are no MIDI input devices available.
        else
        {
            MessageBox("No MIDI input devices available.", "Warning", 
                MB_ICONWARNING | MB_OK);
        }

    }
    catch(const std::exception &ex)
    {
        MessageBox(ex.what(), "Error", MB_ICONSTOP | MB_OK);
    }
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CDemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CDemoDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CDemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}


// Note color preference
void CDemoDlg::OnPrefNoteColor() 
{
	CColorDialog Dlg(m_Keys.GetNoteOnColor());

    if(Dlg.DoModal() == IDOK)
    {
        m_Keys.SetNoteOnColor(Dlg.GetColor());
    }	
}


// MIDI device preferences
void CDemoDlg::OnPrefMididevices() 
{
    try
    {
	    CMIDIDevsDlg Dlg;

        //
        // Initialize MIDI device dialog box
        //

        if(m_OutDevice.IsOpen())
        {
            Dlg.SetOutDevId(m_OutDevice.GetDevID());
        }

        if(m_InDevice.IsOpen())
        {
            Dlg.SetInDevId(m_InDevice.GetDevID());
        }

        // Run dialog box
        if(Dlg.DoModal() == IDOK)
        {
            // If the client clicked OK and they chose to change the 
            // MIDI output device
            if(Dlg.IsOutDevChanged())
            {
                m_OutDevice.Close();
                m_OutDevice.Open(Dlg.GetOutDevId());   
                OnSelchangeGmList();
            }

            // If the client clicked OK and they chose to change the 
            // MIDI input device
            if(Dlg.IsInDevChanged())
            {
                if(m_InDevice.IsOpen())
                {
                    if(m_InDevice.IsRecording())
                    {
	                    // Stop receiving MIDI events 	
                        m_InDevice.StopRecording();   	
                    }
                
                    m_InDevice.Close(); 	
                }

                m_InDevice.Open(Dlg.GetInDevId());   	
                
                // Start receiving MIDI events 	
                m_InDevice.StartRecording(); 
            }
        }	
    }
    catch(const std::exception &ex)
    {
        MessageBox(ex.what(), "Error", MB_ICONSTOP | MB_OK);
    }
}


// Exit the program
void CDemoDlg::OnFileExit() 
{
	SendMessage(WM_CLOSE);
}


// Select a new General MIDI patch
void CDemoDlg::OnSelchangeGmList() 
{
	unsigned char Patch = m_GMCombo.GetCurSel();

    // Construct and send program change message
    midi::CShortMsg Msg(midi::PROGRAM_CHANGE, 0, Patch, 0, 0);
    Msg.SendMsg(m_OutDevice);	

    // Make sure the piano control regains focus when we are done with 
    // the Genera MIDI combo box
    m_Keys.SetFocus();
}


void CDemoDlg::OnHelpAbout() 
{
	CAboutDlg Dlg;

    Dlg.DoModal();	
}

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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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