![]() ![]() You might want to check out the MIDI reference on the MSDN website for in-depth information for details on the different functions.īelow, I highlighted the parts that took me a while to figure out: The source code is rather self-explanatory. Object, e As System.EventArgs) _īutton3.Text = " Show System messages" Elseīutton3.Text = " Hide System messages" End If End Sub Private Sub Form1_FormClosed( ByVal sender As Object, _īyVal e As ) Handles Me.FormClosed ![]() Object, e As System.EventArgs) _īutton2.Text = " Start monitor" End If End Sub Private Sub Button3_Click(sender As System. Object, e As System.EventArgs) _Įnd Sub Private Sub Button2_Click(sender As System. MidiInOpen(hMidiIn, DeviceID, ptrCallback, 0, CALLBACK_FUNCTION Or MIDI_IO_STATUS)īutton2.Text = " Stop monitor" End Sub Private Sub Button1_Click(sender As System. Object, _Į As System.EventArgs) Handles ComboBox1.SelectedIndexChangedĬomboBox1.Enabled = False Dim DeviceID As Integer = ComboBox1.SelectedIndex MidiInGetDevCaps(DevCnt, InCaps, Len(InCaps))Įnd Sub Private Sub ComboBox1_SelectedIndexChanged(sender As System. StatusByte, DataByte1, DataByte2, vbCrLf))Įnd If End Sub Private Sub Form1_Load( ByVal sender As Object, _īyVal e As System.EventArgs) Handles Me.Loadĭim DevCnt As Integer For DevCnt = 0 To (midiInGetNumDevs - 1) TextBox1.AppendText( String.Format( " ", _ If ((HideMidiSysMessages = True) And ((dwParam1 And &HF0) = &HF0)) Then Exit Sub ElseĭataByte2 = (dwParam1 And &HFF0000) > 16 TextBox1.Invoke( New DisplayDataDelegate( AddressOf DisplayData), _Įnd If End Function Private Sub DisplayData(dwParam1) Public Delegate Sub DisplayDataDelegate(dwParam1)ĭim wMid As Int16 ' Manufacturer ID Dim wPid As Int16 ' Product ID Dim vDriverVersion As Integer ' Driver versionĭim szPname As String ' Product Name Dim dwSupport As Integer ' Reserved End Structure Dim hMidiIn As Integer Dim StatusByte As Byte Dim DataByte1 As Byte Dim DataByte2 As Byte Dim MonitorActive As Boolean = False Dim HideMidiSysMessages As Boolean = False Function MidiInProc( ByVal hMidiIn As Integer, _īyVal dwParam1 As Integer, ByVal dwParam2 As Integer) As Integer If MonitorActive = True Then Public Const CALLBACK_FUNCTION As Integer = &H30000 ( ByRef hMidiIn As Integer, ByVal uDeviceID As Integer, _īyVal dwCallback As MidiInCallback, ByVal dwInstance As Integer, _īyVal dwFlags As Integer) As Integer Public Declare Function midiInStart Lib " winmm.dll" ( ByVal hMidiIn As Integer) As Integer Public Declare Function midiInStop Lib " winmm.dll" ( ByVal hMidiIn As Integer) As Integer Public Declare Function midiInReset Lib " winmm.dll" ( ByVal hMidiIn As Integer) As Integer Public Declare Function midiInClose Lib " winmm.dll" ( ByVal hMidiIn As Integer) As Integer Public Delegate Function MidiInCallback( ByVal hMidiIn As Integer, _īyVal wMsg As UInteger, ByVal dwInstance As Integer, _īyVal dwParam1 As Integer, ByVal dwParam2 As Integer) As Integer Public ptrCallback As New MidiInCallback( AddressOf MidiInProc) MIDI data can be transferred via MIDI or USB cable, or recorded to a sequencer or digital audio workstation to be edited or played back.Public Declare Function midiInGetNumDevs Lib " winmm.dll" () As Integer Public Declare Function midiInGetDevCaps Lib " winmm.dll" _Īlias " midiInGetDevCapsA" ( ByVal uDeviceID As Integer, _īyRef lpCaps As MIDIINCAPS, ByVal uSize As Integer) As Integer Public Declare Function midiInOpen Lib " winmm.dll" _ One common MIDI application is to play a MIDI keyboard or other controller and use it to trigger a digital sound module (which contains synthesized musical sounds) to generate sounds, which the audience hears produced by a keyboard amplifier. When a musician plays a MIDI instrument, all of the key presses, button presses, knob turns and slider changes are converted into MIDI data. MIDI carries event messages data that specify the instructions for music, including a note's notation, pitch, velocity (which is heard typically as loudness or softness of volume) vibrato panning to the right or left of stereo and clock signals (which set tempo). This could be sixteen different digital instruments, for example. The specification originates in a paper published by Dave Smith and Chet Wood then of Sequential Circuits at the October 1981 Audio Engineering Society conference in New York City then titled Universal Synthesizer Interface.Ī single MIDI link through a MIDI cable can carry up to sixteen channels of information, each of which can be routed to a separate device or instrument. MIDI (an acronym for Musical Instrument Digital Interface) is a technical standard that describes a communications protocol, digital interface, and electrical connectors that connect a wide variety of electronic musical instruments, computers, and related audio devices for playing, editing and recording music. ![]()
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