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Sunday, January 30, 2011

My first step-by-step tutorial on Simple Music Player (VS2008) Part II

 

     After the First Part of my step-by-step tutorial which is the Interface of the Music Player, now I will start with the coding.

     First of all, to use Microsoft.DirectX.AudioVideoPlayback reference that added in previous post, add this line:

“Imports Microsoft.DirectX.AudioVideoPlayback”

to the coding. To open the coding, press F7. The following picture shows the position of the line.


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The line is added at the most top outside the class.


     After that, we will need to declare some variables for later use.


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Comments are added besides the coding as to explain the use of each variable. "#Region" is use to separate coding into region and for this one, I use declaration as the region name. You can use any name you like as it is just to understand what the region use for.


Code to be copied:



#Region "declaration"
    Public WithEvents objAudio As Audio
    Private b_musicplaying As Boolean  'use to store music play state
    Private b_musicEnding As Boolean  'use to check end of music
    Private b_loadmusic As Boolean 'use to check loaded music
    Private int_currplayindex As Integer 'use to store current playing index
    Private str_filename As String 'use to store current filename
    Private str_filepath As String 'use to store current filepath
    Private clr_previous As Color 'use to store color for previouly played music
#End Region

Public WithEvents objAudio As Audio


use to set objAudio as Audio in the DirectX (obj means object - this will make user to clear about what we assign to objAudio. objAudio had been assigned with Audio with include the events.)


After declaration, I will continue with the method of drag in music files into the listview1.


 


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I didn't explain much in this drag in or drag drop method. For any private sub that handles the object we drag into our interface, you can look at the top where it shows ListView1 in the above picture. If you move your mouse there, a tooltip balloon will show "Class Name" and beside it is "Method Name".


As I mention in the method, I actually modified someone method of looking for directory inside directory... Means look for files inside two layer of directories. I modified it so that when I drag in a folder which contains folders that having a lot of songs inside, it will add the filename into ListView1 and filepath into ListView2.


Code to be copied:


#Region "file_dragenter"


    'this method is being modified from someone else.
    'Sorry for forget his name.
    'This method will only works with two layer directories.
    'Will not works if the files is deep inside more than two layer directories
    'If anyone knows how to loop to find all files in deep, please share it with me. Thanks


    Private Sub ListView1_DragDrop(ByVal sender As Object, _
                                   ByVal e As System.Windows.Forms.DragEventArgs) _
                                   Handles ListView1.DragDrop
        Dim I, iMaxFiles As Integer
        Dim iMaxDir As Integer
        Dim oFileName As String
        Dim str_path As Array
        Dim colFiles() As String = e.Data.GetData(DataFormats.FileDrop, True)
        Dim filelength As Double
        iMaxFiles = colFiles.GetUpperBound(iMaxFiles)
        If iMaxFiles = 0 Then


        End If
        For I = 0 To iMaxFiles
            oFileName = System.IO.Path.GetFileName(colFiles(I))
            filelength = colFiles.Length
            Try
                System.IO.Directory.GetDirectories(colFiles(I))
                If System.IO.Directory.GetDirectories(colFiles(I)).Length > 0 Then
                    iMaxDir = System.IO.Directory.GetDirectories(colFiles(I)).GetUpperBound(iMaxDir)
                    str_path = System.IO.Directory.GetDirectories(colFiles(I))
                    For j = 0 To iMaxDir
                        Dim di As New IO.DirectoryInfo(str_path(j))
                        Dim diar1 As IO.FileInfo() = di.GetFiles("*.mp3") 'change here for other format of files
                        Dim dra As IO.FileInfo
                        For Each dra In diar1
                            ListView1.Items.Add(dra.ToString)
                            ListView2.Items.Add(str_path(j) & "\" & dra.ToString)
                        Next
                    Next
                Else
                    Dim di As New IO.DirectoryInfo(colFiles(I))
                    Dim diar1 As IO.FileInfo() = di.GetFiles("*.mp3") 'change here for other format of files
                    Dim dra As IO.FileInfo


                    For Each dra In diar1
                        ListView1.Items.Add(dra.ToString)
                        ListView2.Items.Add(colFiles(I) & "\" & dra.ToString)
                    Next
                End If
            Catch ex As Exception
                ListView1.Items.Add(oFileName)
                ListView2.Items.Add(colFiles(I))
            End Try
        Next
    End Sub



    Private Sub ListView1_DragEnter(ByVal sender As Object, _
                                    ByVal e As System.Windows.Forms.DragEventArgs) _
                                    Handles ListView1.DragEnter


        e.Effect = DragDropEffects.Copy


    End Sub
#End Region


Reminder:Remember to change your listview1 properties (allowdrop to true). Now you can try to drag and drop a folder into listview1. To do this, you will need to debug the program by pressing F5. Only mp3 files can be drop in if you didn't change the format at here:


Dim diar1 As IO.FileInfo() = di.GetFiles("*.mp3") 'change here for other format of files

 


Now, we will come to the construction part where the main coding works here.


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The above picture shows what happens when the form is loaded, button1,2,3,4 being clicked, listveiw1 being clicked and double clicked. The coding to be copied is provided as following:



#Region "construction"
    Private Sub SimpleMusicPlayer_Load(ByVal sender As System.Object, _
                                       ByVal e As System.EventArgs) _
                                       Handles MyBase.Load


        'occurs when form load
        clr_previous = Color.DarkGray 'change previouly played music color here


    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button1.Click


        'occurs when button1 (Play) clicked
        If b_loadmusic = False Then Exit Sub 'exit if no music loaded
        If b_musicplaying = True Then   'if music playing now
            objAudio.Pause()
            Button1.Text = "Play"   'change text from pause to play
            b_musicplaying = False  'set playing as false as music is paused
        ElseIf b_musicplaying = False Then
            Timer1.Start()  'start timer1 - use to check when music end.
            Try
                objAudio.Stop()
            Catch ex As Exception
            End Try
            objAudio.Play()         'play the music
            Button1.Text = "Pause"  'change text from play to pause
            b_musicplaying = True   'set playing as true as music started
        End If


    End Sub


    Private Sub Button2_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button2.Click


        'occurs when button2 (Stop) clicked


        If b_loadmusic = False Then Exit Sub 'exit if no music loaded
        objAudio.Stop() 'stop the music
        ListView1.Items.Item(int_currplayindex).BackColor = clr_previous 'previous color
        Timer1.Stop()   'stop timer1 as music consider ended.
        Button1.Text = "Play"   'change text from pause to play
    End Sub


    Private Sub Button3_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button3.Click


        If b_loadmusic = False Then Exit Sub
        If objAudio.Playing = True Then
            Try
                objAudio.Stop()
                ListView1.Items.Item(int_currplayindex).BackColor = clr_previous 'previous color
                int_currplayindex = int_currplayindex - 1
                If int_currplayindex < 0 Then
                    int_currplayindex = ListView1.Items.Count - 1
                End If
                ListView1.Items.Item(int_currplayindex).Selected = True
                ListView1.Items.Item(int_currplayindex).EnsureVisible()
                Try
                    If int_currplayindex < 0 Then Exit Try
                    str_filepath = CStr(ListView2.Items.Item(int_currplayindex).Text) 'getting file path
                    objAudio = New Audio(str_filepath, False)  'method to load music
                    b_loadmusic = True
                    objAudio.Play()
                Catch ex As Exception
                End Try
            Catch ex As Exception
            End Try
        End If
    End Sub


    Private Sub Button4_Click(ByVal sender As System.Object, _
                              ByVal e As System.EventArgs) _
                              Handles Button4.Click


        If b_loadmusic = False Then Exit Sub
        If objAudio.Playing = True Then
            Try
                objAudio.Stop()
                ListView1.Items.Item(int_currplayindex).BackColor = clr_previous 'previous color
                int_currplayindex = int_currplayindex + 1
                If int_currplayindex > ListView1.Items.Count - 1 Then
                    int_currplayindex = 0
                End If
                ListView1.Items.Item(int_currplayindex).Selected = True
                ListView1.Items.Item(int_currplayindex).EnsureVisible()
                Try
                    If int_currplayindex < 0 Then Exit Try
                    If int_currplayindex > ListView1.Items.Count - 1 Then
                        int_currplayindex = 0
                    End If
                    str_filepath = CStr(ListView2.Items.Item(int_currplayindex).Text) 'getting file path
                    objAudio = New Audio(str_filepath, False)  'method to load music
                    b_loadmusic = True
                    objAudio.Play()
                Catch ex As Exception
                End Try
            Catch ex As Exception
            End Try
        End If


    End Sub


    Private Sub ListView1_Click(ByVal sender As Object, _
                                ByVal e As System.EventArgs) _
                                Handles ListView1.Click


        If b_musicplaying = True Then Exit Sub 'do nothing if music playing.
        If int_currplayindex <> Nothing Then
            Try
                If ListView1.SelectedItems(0).Index <> int_currplayindex Then
                    ListView1.Items.Item(int_currplayindex).BackColor = clr_previous 'previous color
                End If
            Catch ex As Exception
            End Try
        End If
        Try
            int_currplayindex = ListView1.SelectedItems(0).Index
            ListView1.Items.Item(int_currplayindex).EnsureVisible()
            If int_currplayindex < 0 Then Exit Try
            str_filepath = CStr(ListView2.Items.Item(int_currplayindex).Text) 'getting file path
            objAudio = New Audio(str_filepath, False)  'method to load music
            b_loadmusic = True
        Catch ex As Exception
            b_loadmusic = False
        End Try
    End Sub


    Private Sub ListView1_DoubleClick(ByVal sender As Object, _
                                      ByVal e As System.EventArgs) _
                                      Handles ListView1.DoubleClick


        ListView1.Items.Item(int_currplayindex).BackColor = clr_previous 'previous color
        int_currplayindex = ListView1.SelectedItems(0).Index
        ListView1.Items.Item(int_currplayindex).EnsureVisible()
        str_filepath = CStr(ListView2.Items.Item(int_currplayindex).Text)
        If b_loadmusic = True Then
            If b_musicplaying = True Then
                Timer1.Stop()
                objAudio.Stop()
                b_musicEnding = True
                Button1.Text = "Play"
            End If
        End If
        Try
            objAudio = New Audio(str_filepath, False)
            b_loadmusic = True
            b_musicplaying = True
            Timer1.Start()
            objAudio.Play()
            Button1.Text = "Pause"
        Catch ex As Exception
            b_loadmusic = False
            b_musicplaying = False
        End Try
    End Sub
#End Region


There will be part III for the final part of coding.                                                                         Please feel free to ask any questions if you don't understand this method or any coding here.    


(PS: Sorry for my noob code block. I don't really know html much although my website is fully customized in html and CSS only.)



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