Lesson 16: Creating Multimedia Applications-Part II

In previous lesson, we have programmed a CD player. Now, with some modifications, we will transform the CD player into an audio file player. This player will be created in such a way that it could search for wave and midi files in your drives and play them.

In this project, you need to insert a ComboBox, a DriveListBox, a DirListBox, a TextBox and a FileListBox into your form.I Shall briefly discuss the function of each of the above controls. Besides, you must also insert Microsoft Multimedia Control(MMControl) in your form , you may make it visible or invisible. In my program, I choose to make it invisible so that I could use the command buttons created to control the player.

• ComboBox- to display and enable selection of different type of files.
• DriveListBox- to allow selection selection of different drives available on your PC.
• DirListBox - To display directories
• TextBox - To display selected files
• FileListBox- To display files that are available

Relevant codes must be written to coordinate all the above controls so that the application can work properly. The program should flow in the following logical way:

Step 1: User choose the type of files he wants to play.

Step2:User selects the drive that might contains the relevant audio files.

Step 3:User looks into directories and subdirectories for the files specified in step1. The files should be displayed in the  FileListBox.

Step 4:  User selects the files from the FileListBox and click the Play button.

Step 5: User click on the Stop to stop playing and Exit button to end the application.

The Interface

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The Code

Private Sub Combo1_Change()
' to determine file type

If ListIndex = 0 Then
File1.Pattern = ("*.wav")
ElseIf ListIndex = 1 Then
File1.Pattern = ("*.mid")
Else
Fiel1.Pattern = ("*.*")
End If

End Sub


Private Sub Dir1_Change()

'To change directories and subdirectories(or folders and subfolders)

File1.Path = Dir1.Path
If Combo1.ListIndex = 0 Then
File1.Pattern = ("*.wav")
ElseIf Combo1.ListIndex = 1 Then
File1.Pattern = ("*.mid")
Else
File1.Pattern = ("*.*")
End If
End Sub

Private Sub Drive1_Change()

'To change drives

Dir1.Path = Drive1.Drive

End Sub

Private Sub File1_Click()
If Combo1.ListIndex = 0 Then
File1.Pattern = ("*.wav")
ElseIf Combo1.ListIndex = 1 Then
File1.Pattern = ("*.mid")
Else
File1.Pattern = ("*.*")
End If

If Right(File1.Path, 1) <> "\" Then
filenam = File1.Path + "\" + File1.FileName
Else
filenam = File1.Path + File1.FileName
End If
Text1.Text = filenam

End Sub


Private Sub Form_Load()

'To center the Audioplayer startup page

Left = (Screen.Width - Width) \ 2
Top = (Screen.Height - Height) \ 2
Combo1.Text = "*.wav"
Combo1.AddItem "*.wav"
Combo1.AddItem "*.mid"
Combo1.AddItem "All files"

End Sub

Private Sub AudioPlayer_Click()

End Sub

Private Sub play_Click()

'To play WaveAudio file or Midi File

Command2_Click
If Combo1.ListIndex = 0 Then
AudioPlayer.DeviceType = "WaveAudio"
ElseIf Combo1.ListIndex = 1 Then
AudioPlayer.DeviceType = "Sequencer"
End If
AudioPlayer.FileName = Text1.Text
AudioPlayer.Command = "Open"
AudioPlayer.Command = "Play"

End Sub


Private Sub stop_Click()
If AudioPlayer.Mode = 524 Then Exit Sub
If AudioPlayer.Mode <> 525 Then
AudioPlayer.Wait = True
AudioPlayer.Command = "Stop"
End If
AudioPlayer.Wait = True
AudioPlayer.Command = "Close"
End Sub

Private Sub Exit_Click()
End
End Sub

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