Visual Basic Tutorial Lesson 21:Creating Multimedia Applications-Part III

Lesson 21: Creating Multimedia Applications-Part III

In lesson 20, we have created an audio player. Now, by making further modifications, you can transform the audio player into a picture viewer. This viewer will be created in such a way that it could search for all types of graphics files in your drives and displays them in a picture frame.

Similar to the previous project, in this project, you need to insert a ComboBox, a DriveListBox, a DirListBox, a TextBox and a FileListBox into your form. I Shall briefly explain again the function of each of the above controls.

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 chooses the type of files he wants to play.

Step2:User selects the drive that might contains the relevant graphic 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 Show button.

Step 5: User clicks on Exit button to end the application.

The Interface

The Code

Private Sub Form_Load()

'To center the player
Left = (Screen.Width - Width) \ 2
Top = (Screen.Height - Height)\2

Combo1.Text = "All graphic files"
Combo1.AddItem "All graphic files"
Combo1.AddItem "All files"

End Sub
　

Private Sub Combo1_Change()

If ListIndex = 0 Then
File1.Pattern = ("*.bmp;*.wmf;*.jpg;*.gif")
Else
Fiel1.Pattern = ("*.*")
End If

End Sub

'Specific the types of files to load
Private Sub Dir1_Change()

File1.Path = Dir1.Path
File1.Pattern = ("*.bmp;*.wmf;*.jpg;*.gif")

End Sub

'Changing Drives

Private Sub Drive1_Change()

Dir1.Path = Drive1.Drive

End Sub
　

Private Sub File1_Click()

If Combo1.ListIndex = 0 Then
File1.Pattern = ("*.bmp;*.wmf;*.jpg;*.gif")
Else
File1.Pattern = ("*.*")
EnId 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 show_Click()

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

'To load the picture into the picture box
picture1.Picture = LoadPicture(filenam)

End Sub
　