Visual Basic Source Code/Visual Basic Source Code.iso/vbsource/mididemo/midi.frm

Visual Basic Form | 1995-05-02 | 29.5 KB | 825 lines

VERSION 2.00
Begin Form MidiPlayer
   BackColor       =   &H00FFFFFF&
   Caption         =   "Midi Demo"
   ClientHeight    =   5460
   ClientLeft      =   1560
   ClientTop       =   2175
   ClientWidth     =   6300
   ClipControls    =   0   'False
   ForeColor       =   &H00C00000&
   Height          =   6150
   KeyPreview      =   -1  'True
   Left            =   1500
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   5460
   ScaleWidth      =   6300
   Top             =   1545
   Width           =   6420
   Begin CommandButton BTN_ClearList
      Caption         =   "&Clear"
      Height          =   400
      Left            =   2400
      TabIndex        =   14
      Top             =   3500
      Width           =   1000
   End
   Begin CommandButton BTN_QueueAll
      Caption         =   "Queue &All"
      Height          =   400
      Left            =   2400
      TabIndex        =   13
      Top             =   2900
      Width           =   1000
   End
   Begin CommandButton BTN_Queue
      Caption         =   "&Queue"
      Height          =   400
      Left            =   2400
      TabIndex        =   12
      Top             =   2300
      Width           =   1000
   End
   Begin ListBox PlayList
      Height          =   4710
      Left            =   3795
      TabIndex        =   5
      Top             =   500
      Width           =   2370
   End
   Begin FileListBox File1
      Height          =   3345
      Left            =   100
      MultiSelect     =   2  'Extended
      TabIndex        =   11
      Top             =   1875
      Width           =   1800
   End
   Begin DirListBox Dir1
      Height          =   930
      Left            =   100
      TabIndex        =   10
      Top             =   870
      Width           =   1800
   End
   Begin DriveListBox Drive1
      Height          =   315
      Left            =   100
      TabIndex        =   9
      Top             =   500
      Width           =   1800
   End
   Begin CommandButton BTN_Pause
      Caption         =   "Pa&use"
      Height          =   400
      Left            =   2400
      TabIndex        =   2
      Top             =   1700
      Width           =   1000
   End
   Begin CommandButton BTN_Exit
      Caption         =   "&Exit"
      Height          =   400
      Left            =   2400
      TabIndex        =   4
      Top             =   4700
      Width           =   1000
   End
   Begin CommandButton BTN_Stop
      Caption         =   "&Stop"
      Height          =   400
      Left            =   2400
      TabIndex        =   3
      Top             =   4100
      Width           =   1000
   End
   Begin CommandButton BTN_Next
      Caption         =   "&Next"
      Height          =   400
      Left            =   2400
      TabIndex        =   1
      Top             =   1100
      Width           =   1000
   End
   Begin CommandButton BTN_Play
      Caption         =   "&Play"
      Height          =   400
      Left            =   2400
      TabIndex        =   0
      Top             =   500
      Width           =   1000
   End
   Begin Label Label1
      Caption         =   "Total Time:"
      Height          =   225
      Left            =   100
      TabIndex        =   6
      Top             =   210
      Width           =   2100
   End
   Begin Label Label3
      Caption         =   "Elapsed Time:"
      Height          =   225
      Left            =   3765
      TabIndex        =   8
      Top             =   210
      Width           =   1245
   End
   Begin Label lblElapsedTime
      Caption         =   "00:00"
      Height          =   225
      Left            =   5025
      TabIndex        =   7
      Top             =   210
      Width           =   630
   End
   Begin Menu MNU_File
      Caption         =   "&File"
      Begin Menu MNU_MidiMap
         Caption         =   "&Run Midi Mapper"
      End
      Begin Menu Separator2
         Caption         =   "-"
      End
      Begin Menu MNU_Exit
         Caption         =   "&Exit"
      End
   End
   Begin Menu MNU_About
      Caption         =   "&About"
   End
' Disclaimer of Warranty:
' This software and the accompanying files are provided "as is"
' and without warranties as to performance of the software and
' the accompanying files or any other warranties whether expressed
' or implied.  No warranty of fitness for a particular purpose
' is offered.
' You may not sell this software or it's source code.
' You may use this code in any way you find useful.
Declare Function mciSendString Lib "mmsystem" (ByVal lpstrCommand$, ByVal lpstrReturnStr As Any, ByVal wReturnLen%, ByVal hCallBack%) As Long
Declare Function mciGetErrorString Lib "mmsystem" (ByVal dwError As Long, ByVal lpstrBuffer As Any, ByVal wLength As Integer) As Integer
Declare Function GetModuleUsage% Lib "Kernel" (ByVal hModule%)
Option Base 1       'Set arrays to use a base of 1
Dim SongPath() As String    'array to store path and file name of the midi file
Dim NumSongsQueued As Integer  'Total number of songs queued in the Play List
Dim Number As Integer       'The song that is currently playing
Dim TotalTime As String     'Playing time of all queued songs in format "(HH:MM:SS)"
Dim TTime As Single         'Playing time of all queued songs for calculations
'Flags
'All flags are either true or false
Dim StopPlayback, PausePlayback, NextSong As Integer 'Flags for controlling playback
Dim SongPlaying As Integer  'Flag to let the whole program know whenever a song is playing
Dim UnPaused As Integer     'Flag for indicating when a song has been paused and then started again
Sub BTN_ClearList_Click ()
    'Remove each item in the Play List
    If PlayList.ListCount > 0 Then
        For I = 0 To PlayList.ListCount - 1
            PlayList.RemoveItem 0
        Next
    End If
    'Start with "clean" array
    Erase SongPath
    'Reset variables
    NumSongsQueued = 0
    TTime = 0
    TotalTime = "00:00:00"
    label1.Caption = "Total Time: " + TotalTime
    BTN_Play.Enabled = False
End Sub
Sub BTN_Exit_Click ()
    Unload MidiPlayer
End Sub
Sub BTN_Next_Click ()
    'This routine will stop playback of the current song and
    'and skip to either the next song in the list, or jump
    'to any song which the user highlights in the play list.
    Dim Ret, ErrorRet As Integer
    Dim mciErrorText As String
    Dim mciBuffer As Integer
    mciBuffer = 255
    mciErrorText = Space(255)
    'Set NextSong flag to true
    NextSong = True
    'Close the song that is playing.
    'This automatically stops playback
    Ret = mciSendString("close all", 0&, 0, 0)
    If Ret <> 0 Then GoTo mciError3

    'If the song highlighted in the Play List is not
    'the song that is currently playing then
    'set Number in the For..Next loop in BTN_Play_Click event
    'to the selected song in the Play List
    If PlayList.ListIndex <> Number - 1 Then
        Number = PlayList.ListIndex
    End If
    Exit Sub
mciError3:
    ErrorRet = mciGetErrorString(Ret, mciErrorText, mciBuffer)
    If ErrorRet = 1 Then
        Msg$ = mciErrorText
        MsgBox Msg$, 48, "Midi Error"
    Else
        MsgBox "An unknown error occured", 16, "Error"
    End If
    Ret = mciSendString("close all", 0&, 0, 0)
End Sub
Sub BTN_Pause_Click ()
    Dim Ret, ErrorRet As Integer
    Dim mciErrorText As String
    Dim mciBuffer As Integer
    mciBuffer = 255
    mciErrorText = Space(255)
    UnPaused = False
    If LCase$(Left$(BTN_Pause.Caption, 2)) = "pa" Then
        BTN_Pause.Caption = "Res&ume"
        'Pause playback of the song
        Ret = mciSendString("pause MidiFile", 0&, 0, 0)
        If Ret <> 0 Then GoTo mciError1
    ElseIf LCase$(Left$(BTN_Pause.Caption, 2)) = "re" Then
        BTN_Pause.Caption = "Pa&use"
        Ret = mciSendString("play MidiFile", 0&, 0, 0)
        If Ret <> 0 Then GoTo mciError1
        'The MCI sequencer doesn't support the RESUME command.
        'The PLAY command will work fine, but the STATUS MODE command
        'will still return PAUSED rather than STOPPED.  Therefore,
        'the program must be informed of this another way.
        UnPaused = True
    End If
    Exit Sub
mciError1:
    ErrorRet = mciGetErrorString(Ret, mciErrorText, mciBuffer)
    If ErrorRet = 1 Then
        Msg$ = mciErrorText
        MsgBox Msg$, 48, "Midi Error"
    Else
        MsgBox "An unknown error occured", 16, "Error"
    End If
    Ret = mciSendString("close all", 0&, 0, 0)
End Sub
Sub BTN_Play_Click ()
    Dim Ret, ErrorRet As Integer
    Dim mciErrorText As String
    Dim mciBuffer As Integer
    Dim PlayDone As Integer, Start As Integer
    mciBuffer = 255
    mciErrorText = Space(255)
    Start = PlayList.ListIndex + 1
    'If Play is pressed and nothing is selected in the Play List,
    'Start will be 0 (because PlayList.ListIndex = -1), so it is
    'necessary to set Start = 1.
    If Start = 0 Then
        Start = 1
    End If
    For Number = Start To NumSongsQueued

        StopPlayback = False
        'PausePlayback = False
        NextSong = False
        PlayDone = False
        'NewSong = True
        'This line opens the sequencer with the specified file.
        Ret = mciSendString("open " + SongPath(Number) + " type sequencer alias MidiFile", 0&, 0, 0)
        'mciSendString always returns 0 if successful.  Any other value indicates
        'that an error occcured.
        If Ret <> 0 Then GoTo mciError

        'This lines plays the file specified in the open command
        Ret = mciSendString("play MidiFile", 0&, 0, 0)
        If Ret <> 0 Then GoTo mciError

        'Highlight the song that is currently playing
        PlayList.Selected(Number - 1) = True
        SongPlaying = True

        'Change the enabled property of all buttons and the menu item to start midi mapper
        BTN_Play.Enabled = False
        BTN_Next.Enabled = True
        BTN_Pause.Enabled = True
        BTN_Stop.Enabled = True
        BTN_Queue.Enabled = False
        BTN_QueueAll.Enabled = False
        MNU_MidiMap.Enabled = False
        BTN_ClearList.Enabled = False

        MLen% = 255
        Msg$ = String$(255, 0)

        'Set the proper time format
        Stat$ = "set MidiFile time format smpte 30 drop"
        Ret = mciSendString(Stat$, Msg$, MLen%, MidiPlayer.hWnd)

        'Execute the following DO loop while the song is playing
        'When the msg$ "stopped" is returned, exit the loop.
        'Also exit the loop if the Next or Stop button are pressed
        'This loop is used to yield control to Windows while a song is playing
        'It also returns the status of the song and the elapsed time.

        Do Until StopPlayback Or NextSong Or PlayDone
        'A slower computer will obviously execute this loop less often.
        'The only effect this should have is that the elapsed time
        'will be updated less frequently causing the seconds to skip
        'some increments.  This probably would only happen on a 386
        'computer.
            'Sending Stat$ will return the status (playing, stopped, paused)
            Stat$ = "status MidiFile mode"

            'In order for these functions to work properly,
            'Msg$ and MMErr$ must be a fixed-length strings
            Ret = mciSendString(Stat$, Msg$, MLen%, MidiPlayer.hWnd)

            'If the playback had been paused, MCI sequencer will still
            'return PAUSED instead of STOPPED after the song has finished.
            'Therefore this must be checked another way.
            If InStr(Msg$, "stopped") Or (InStr(Msg$, "paused") And UnPaused) Then
                PlayDone = True
                UnPaused = False
            End If

            'Send Stat$ to return the elapsed time
            Stat$ = "status MidiFile position"
            Ret = mciSendString(Stat$, Msg$, MLen%, MidiPlayer.hWnd)

            lblElapsedTime.Caption = Mid$(Msg$, 4, 5)

            'Yield control to Windows
            DoEvents
        Loop
        If Not NextSong Then
            'Close midi file and sequencer device
            Ret = mciSendString("close all", 0&, 0, 0)
            If Ret <> 0 Then GoTo mciError
        End If

        'If MNU_Reset.Checked Then
        '    MidiReset
        'End If

        'StopPlayback is only true if the Stop button was clicked
        If StopPlayback Then Exit For
    Next Number

    'When the For..Next loop completes normally, Number is going
    'to be incremented to one higher than what the array is dimensioned for.
    'Therefore, reset Number to the # of queued songs.
    If Number > NumSongsQueued Then
        Number = NumSongsQueued
        PlayList.Selected(Number - 1) = False
    End If
    BTN_Play.Enabled = True
    BTN_Next.Enabled = False
    BTN_Pause.Enabled = False
    BTN_Stop.Enabled = False
    BTN_Queue.Enabled = True
    BTN_QueueAll.Enabled = True
    MNU_MidiMap.Enabled = True
    BTN_Exit.Enabled = True
    BTN_ClearList.Enabled = True
    SongPlaying = False
    Screen.MousePointer = 0
    Exit Sub
mciError:
    Screen.MousePointer = 0
    ErrorRet = mciGetErrorString(Ret, mciErrorText, mciBuffer)
    If ErrorRet = 1 Then
        Msg$ = mciErrorText
        MsgBox Msg$, 48, "Midi Error"
    Else
        MsgBox "An unknown error occured", 16, "Error"
    End If
    Ret = mciSendString("close all", 0&, 0, 0)
End Sub
Sub BTN_Queue_Click ()
    Screen.MousePointer = 11
    For I = 0 To File1.ListCount - 1
        If File1.Selected(I) Then

            File1.Selected(I) = False
            'Increment the number of queued songs and redim the arrays
            NumSongsQueued = NumSongsQueued + 1
            ReDim Preserve SongPath(NumSongsQueued)

            SongPath(NumSongsQueued) = File1.Path + "\" + File1.List(I)
            SongFileName = File1.List(I)
            If IsSongQueued(SongPath(NumSongsQueued)) Then
                Msg$ = SongPath(NumSongsQueued) + CRLF
                Msg$ = Msg$ + "This song is already in the Play List." + CRLF
                Msg$ = Msg$ + "Do you want to queue it again?"
                Ans% = MsgBox(Msg$, 36)
                If Ans% = 7 Then
                    NumSongsQueued = NumSongsQueued - 1
                    ReDim Preserve SongPath(NumSongsQueued)
                    GoTo NextSong
                End If
            End If
            GetTime SongPath(NumSongsQueued)
            'Add the song to the Play List
            PlayList.AddItem SongFileName + " (" + SongLength + ")"

            'Scroll the list of songs, un-select it, and update the total time label
            PlayList.ListIndex = NumSongsQueued - 1
            PlayList.Selected(PlayList.ListIndex) = False
            label1.Caption = "Total Time: " + TotalTime
        End If
NextSong:
    Next I
    If PlayList.ListCount <> 0 Then
        BTN_Play.Enabled = True
    End If
    Screen.MousePointer = 0
End Sub
Sub BTN_QueueAll_Click ()
    ReDim SongPath(1)
    'If any songs are already queued, clear the Play List
    If PlayList.ListCount > 0 Then
        BTN_ClearList_Click
    End If
    Screen.MousePointer = 11
    For I = 0 To File1.ListCount - 1
        NumSongsQueued = NumSongsQueued + 1
        ReDim Preserve SongPath(NumSongsQueued)
        SongPath(NumSongsQueued) = File1.Path + "\" + File1.List(I)
        SongFileName = File1.List(I)

        Song$ = SongPath(NumSongsQueued)
        Call GetTime(Song$)
        label1.Caption = "Total Time: " + TotalTime

        PlayList.AddItem SongFileName + " (" + SongLength + ")"
        PlayList.ListIndex = NumSongsQueued - 1
        PlayList.Selected(PlayList.ListIndex) = False
    Next I
    If PlayList.ListCount <> 0 Then
        BTN_Play.Enabled = True
    End If
    Screen.MousePointer = 0
End Sub
Sub BTN_Stop_Click ()
    Screen.MousePointer = 11
    Ret = mciSendString("stop MidiFile", 0&, 0, 0)
    StopPlayback = True
    DoEvents
    SongPlaying = False
    Ret = mciSendString("Close All", 0&, 0, 0)
End Sub
Function CanPlay ()
    'This function determines if the MCIsequencer and MidiMapper
    'are installed on a system by attempting to open the sequencer
    'and checking the SYSTEM.INI file.
    'Returns 0 if all is well
    'Returns 1 if mcisequencer not installed
    'Returns 2 if Midi Mapper not installed
    'Returns 3 of NEITHER device is installed
    Dim Ret, ErrorRet, RetVal As Integer
    Dim mciErrorText As String * 255
    Dim mciBuffer As Integer
    mciBuffer = 255
    'mciErrorText = Space(255)
    Dim WinDir1 As String * 128
    Dim WinDirSize As Integer
    WinDirSize = 128
    Dim Mapper As String * 128
    Dim MapperSize As Integer
    MapperSize = 128
    CanPlay = False
    Ret = mciSendString("open sequencer", 0&, 0, 0)
    'If the OPEN failed, set function return value to 1
    'A variable must be used and then the value of that variable
    'assigned to the function's return value, otherwise, the function
    'could be called recursively.
    If Ret <> 0 Then
        RetVal = 1
    End If
    'Use the line below if the mciSendString function was unsuccessful
    'and you want to get the associated error message.  This is not
    'neccessary in this routine.
    'If Ret <> 0 Then GoTo mciError2
    'Need to get the Windows directory
    Ret = GetWindowsDirectory(WinDir1, WinDirSize)
    WinDir = LCase(Left$(WinDir1, Ret))
    SysIniFilePath = WinDir + "\system.ini"
    'Since the sequencer will open properly even if Midi Mapper is not installed,
    'check for this in the system.ini file
    a% = GetPrivateProfileString("Drivers", "MidiMapper", "None", Mapper, MapperSize, SysIniFilePath)
    'If there is no line for the Midi Mapper in system.ini,
    'add 2 to return value
    If InStr(Mapper, "None") Then
    'This is where the function would be recursive if a variable
    'were not used.
        RetVal = RetVal + 2
    End If
    'Close the sequencer
    Ret = mciSendString("close all", 0&, 0, 0)
    CanPlay = RetVal
    Exit Function
mciError2:
    ErrorRet = mciGetErrorString(Ret, mciErrorText, mciBuffer)
    If ErrorRet = 1 Then
        Msg$ = mciErrorText
        MsgBox Msg$, 48, "Midi Error"
    Else
        MsgBox "An unknown error occured", 16, "Error"
    End If
    Ret = mciSendString("close all", 0&, 0, 0)
    BTN_Stop_Click
End Function
Sub Dir1_Change ()
    File1.Path = Dir1.Path
End Sub
Sub Drive1_Change ()
    Dir1.Path = Drive1.Drive
End Sub
Sub File1_DblClick ()
    BTN_Queue_Click
End Sub
Sub File1_KeyPress (KeyAscii As Integer)
    If KeyAscii = 13 Then BTN_Queue_Click
End Sub
Sub Form_Load ()
    'Center the window on the desktop
    Move (Screen.Width - Width) \ 2, ((Screen.Height - Height) \ 2 - 200)
    'Initialize variables
    NumSongsQueued = 0
    Index = 0
    TotalTime = "00:00:00"
    label1.Caption = "Total Time: " + TotalTime
    BTN_Play.Enabled = False
    BTN_Next.Enabled = False
    BTN_Pause.Enabled = False
    BTN_Stop.Enabled = False
    Screen.MousePointer = 11
    File1.Pattern = "*.mid"
    Me.Show
    'Define the Carriage Return Line Feed
    CRLF = Chr$(13) + Chr$(10)
    'Determine if the MCIsequencer and Midi Mapper are installed
    Result% = CanPlay()
    Select Case Result%
    Case 0
        'Everything OK, continue with program
    Case 1  'MCIsequencer not installed
        Msg$ = "The MCI sequencer driver is not installed.  "
        Msg$ = Msg$ + "This driver MUST be installed before you can use the player.  "
        Msg$ = Msg$ + "See your Windows user guide for information on installing the MCI sequencer."
        MsgBox Msg$, 16
        End
    Case 2  'Midi Mapper not installed
        Msg$ = "The Midi Mapper is not installed.  "
        Msg$ = Msg$ + "This driver MUST be installed before you can use the player.  "
        Msg$ = Msg$ + "See your Windows user guide for information on installing the Midi Mapper."
        MsgBox Msg$, 16
        End
    Case 3  'Neither is installed
        Msg$ = "The MCIsequencer AND the Midi Mapper are not installed.  "
        Msg$ = Msg$ + "These drivers MUST BOTH be installed before you can use the player.  "
        Msg$ = Msg$ + "See your Windows user guide for information on installing these drivers."
        MsgBox Msg$, 16
        End
    End Select
    File1.SetFocus
    Screen.MousePointer = 0
End Sub
Sub Form_Unload (Cancel As Integer)
    'If SongPlaying Then
    '    Cancel = True
    '    Exit Sub
    'End If
    'Ensure any open devices are closed before exiting
    Ret% = mciSendString("close all", 0&, 0, 0)
    DoEvents
    Erase SongPath
    End
End Sub
Sub GetTime (Song As String)
    'This sub retrieves the time of a single midi file
    Dim Ret, ErrorRet As Integer
    Dim mciErrorText As String
    Dim mciBuffer As Integer
    mciBuffer = 255
    mciErrorText = Space(255)
    MLen% = 255
    Msg$ = String$(255, 0)
    MMErr$ = String$(255, 0)
    'Open the midi file
    Ret = mciSendString("open " + Song + " type sequencer alias TimeInfo", 0&, 0, 0)
    'Set the appropriate time format
    Stat$ = "set TimeInfo time format smpte 30 drop"
    Ret = mciSendString(Stat$, Msg$, MLen%, MidiPlayer.hWnd)
    'Get the playing time of the opened midi file
    Stat$ = "status TimeInfo length"
    Ret = mciSendString(Stat$, Msg$, MLen%, MidiPlayer.hWnd)
    If Ret <> 0 Then GoTo mciError5
    'Trim the string down to just the needed info
    SongLength = Mid$(Left$(Msg$, 11), 4, 5)
    'If SongLength begins with a 0, eliminate it
    If Left$(SongLength, 1) = "0" Then
        SongLength = Mid$(SongLength, 2)
    End If
    'Call the Sub to accumulate the length of all songs queued
    GetTotalTime
    'Close the device
    Ret = mciSendString("close all", 0&, 0, 0)
    'Make sure Windows has processed all events
    DoEvents
    Exit Sub
mciError5:
    ErrorRet = mciGetErrorString(Ret, mciErrorText, mciBuffer)
    If ErrorRet = 1 Then
        Msg$ = mciErrorText
        MsgBox Msg$, 48, "Midi Error"
    Else
        MsgBox "An unknown error occured", 16, "Error"
    End If
    Ret = mciSendString("close all", 0&, 0, 0)
End Sub
Sub GetTotalTime ()
    'This sub accumulates the time of all songs as they are queued
    On Error GoTo TimeError
    ColonPosition = InStr(SongLength, ":")
    Minutes = Val(Mid$(SongLength, 1, ColonPosition - 1))
    'Seconds are converted to a decimal value
    Seconds = Val(Mid$(SongLength, ColonPosition + 1)) / 60
    SongTime = Minutes + Seconds
    'Since TotalTime is used a variable elsewhere in the program,
    'use TTime instead
    TTime = TTime + SongTime
    DecimalPosition = InStr(Trim$(Str$(TTime)), ".")
    'If there's no decimal then seconds are 0, and ".00" must be appended
    'to TT$
    If DecimalPosition = 0 Then
        'TT$ is the total time stored as a string
        TT$ = Trim$(Str$(TTime)) + ".00"
        DecimalPosition = InStr(TT$, ".")
    Else
        TT$ = Mid$(Trim$(Str$(TTime)), 1, DecimalPosition + 2)
        If Len(Mid$(TT$, DecimalPosition + 1)) = 1 Then
            TT$ = TT$ & "0"
        End If
    End If
    'Convert the seconds from decimal back to standard time
    Seconds = Val(Mid$(TT$, DecimalPosition + 1))
    Seconds = Seconds * .6
    'Find the position of the decimal point
    SecsDecimalPos = InStr(Str$(Seconds), ".")
    'Do some rounding off if necessary
    If SecsDecimalPos > 0 Then
        If Mid(Seconds, SecsDecimalPos, 1) > 5 Then
            Seconds = Fix(Seconds)
            Seconds = Seconds + 1
        Else
            Seconds = Fix(Seconds)
        End If
    End If
    'Get the total number of minutes
    Minutes = Val(Mid$(TT$, 1, DecimalPosition - 1))
    'Compute the hours and the remaining minutes
    Hours = Minutes \ 60
    Minutes = Minutes - (Hours * 60)
    'Convert each time unit to a string
    Secs$ = Trim$(Str$(Seconds))
    Mins$ = Trim$(Str$(Minutes))
    Hrs$ = Trim$(Str$(Hours))
    'If the number of seconds, minutes, or hours is a single digit,
    'place a 0 in front
    If Len(Secs$) = 1 Then
        Secs$ = "0" + Secs$
    End If
    If Len(Mins$) = 1 Then
        Mins$ = "0" + Mins$
    End If
    If Len(Hrs$) = 1 Then
        Hrs$ = "0" + Hrs$
    End If
    'Create the total time string
    TotalTime = Hrs$ + ":" + Mins$ + ":" + Secs$
    Exit Sub
TimeError:
    Msg$ = "An error occurred while determining the time of the midi file.  "
    Msg$ = Msg$ + "The program can continue, but the Total Time will not be accurate."
    MsgBox Msg$, 48, "Non-Critical Error"
    Resume Next
End Sub
Function IsSongQueued (SongQueued As String) As Integer
    IsSongQueued = False
    For I = 1 To NumSongsQueued - 1
        If SongPath(I) = SongQueued Then
            IsSongQueued = True
            Exit For
        End If
    Next I
End Function
Sub MNU_About_Click ()
    AboutBox.Show 1
End Sub
Sub MNU_Exit_Click ()
    BTN_Exit_Click
End Sub
Sub MNU_MidiMap_Click ()
On Error GoTo MidiMapErr
    'Shell to the Midi Mapper
    X% = Shell("control midi mapper", 1)
    'Yield to Windows and disable the main form while
    'the midi mapper is running.  This loop continues
    'until the shelled app has been closed.
    While GetModuleUsage(X%) > 0
        z% = DoEvents()
        MidiPlayer.Enabled = False
    Wend
    MidiPlayer.Enabled = True
    MidiPlayer.SetFocus
    Exit Sub
MidiMapErr:
    On Error GoTo 0
    MsgBox "Could not start Midi Mapper", 16
    Exit Sub
End Sub
Sub PlayList_DblClick ()
    If SongPlaying Then Exit Sub
    SelectedItemInList = PlayList.ListIndex
    'Remove the highlighted item from the array
    If SelectedItemInList + 1 = NumSongsQueued Then 'removing the last item in list
        SongPath(NumSongsQueued) = ""
    Else
        'Move all entries in the list that follow the deleted entry
        'up 1 in the array
        For I = SelectedItemInList + 1 To NumSongsQueued - 1
            SongPath(I) = SongPath(I + 1)
        Next
    End If
    SubtractTime
    label1.Caption = "Total Time: " + TotalTime
    PlayList.RemoveItem SelectedItemInList
    NumSongsQueued = PlayList.ListCount
    If NumSongsQueued > 0 Then
        'ReDim the array to equal the # of songs in the Play List
        ReDim Preserve SongPath(NumSongsQueued)
    Else
        BTN_Play.Enabled = False
        Erase SongPath
        TTime = 0
        TotalTime = "00:00:00"
        label1.Caption = "Total Time: " + TotalTime
    End If
End Sub
Sub SubtractTime ()
    'This procedure is very similiar to GetTotalTime but it naturally
    'subtracts the song's time instead of adding it
    'Get the song's time from the entry in the play list
    Tyme$ = Right$(PlayList.List(PlayList.ListIndex), 7)
    ColonPosition = InStr(Tyme$, ":")
    FirstParen = InStr(Tyme$, "(")
    Minutes = Val(Mid$(Tyme$, FirstParen + 1, ColonPosition - FirstParen - 1))
    Seconds = Val(Mid$(Tyme$, ColonPosition + 1, 2)) / 60
    SongTime = Minutes + Seconds
    TTime = TTime - SongTime
    DecimalPosition = InStr(Trim$(Str$(TTime)), ".")
    'If there's no decimal then seconds are 0, and ".00" must be appended
    'to TT$
    If DecimalPosition = 0 Then
        TT$ = Trim$(Str$(TTime)) + ".00"
        DecimalPosition = InStr(TT$, ".")
    Else
        TT$ = Mid$(Trim$(Str$(TTime)), 1, DecimalPosition + 2)
        If Len(Mid$(TT$, DecimalPosition + 1)) = 1 Then
            TT$ = TT$ & "0"
        End If
    End If
    'Convert the seconds from decimal to the standard
    'number of seconds
    Seconds = Val(Mid$(TT$, DecimalPosition + 1))
    Seconds = Seconds * .6
    'If there is a decimal part to the seconds,
    'round it off to the closest integer
    SecsDecimalPos = InStr(Str$(Seconds), ".")
    If SecsDecimalPos > 0 Then
        If Mid(Seconds, SecsDecimalPos, 1) > 5 Then
            Seconds = Fix(Seconds)
            Seconds = Seconds + 1
        Else
            Seconds = Fix(Seconds)
        End If
    End If
    'Get the total number of minutes
    Minutes = Val(Mid$(TT$, 1, DecimalPosition - 1))
    'Compute the hours and the remaining minutes
    Hours = Minutes \ 60
    Minutes = Minutes - (Hours * 60)
    'Convert each time unit to a string
    Secs$ = Trim$(Str$(Seconds))
    Mins$ = Trim$(Str$(Minutes))
    Hrs$ = Trim$(Str$(Hours))
    'If the number of seconds, minutes, or hours is a single digit,
    'place a 0 in front
    If Len(Secs$) = 1 Then
        Secs$ = "0" + Secs$
    End If
    If Len(Mins$) = 1 Then
        Mins$ = "0" + Mins$
    End If
    If Len(Hrs$) = 1 Then
        Hrs$ = "0" + Hrs$
    End If
    'Create the total time string
    TotalTime = Hrs$ + ":" + Mins$ + ":" + Secs$
End Sub