Lesson 20: Creating Multimedia Applications-Part II

In previous lesson, we have programmed a CD player. Now, by making some modifications, you canl transform the CD player into an audio 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) into your form , you may make it visible or invisible. In my program, I choose to make it invisible so that I can 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 code must be written to coordinate all the above controls so that the application can work properly. The program should follow in the following logical way:
Step 1: User chooses 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 clicks on the Stop button to stop playing and Exit button to end the application.

The Interface

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 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 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

 http://www.vbtutor.net/vb6/vbtutor.html