Question

简单的播放器用vb.net怎么做啊

请问简单的播放器用vb.net怎么做啊,高手帮忙 - -|| 不甚感激
详细点```(对了vb.net那个组件在哪里啊 WindowsMediaPlayer ？)

Answer 1

右击工具箱/部件/WindowsMediaPlayer
//类模块Mmedia
Option Explicit

'-----------------------------------------------------
' Name : MMedia.cls
' Author : Peter Wright, For BG2VB4 & BG2VB5
'
' Notes : A multimedia class, which when turned
' : into an object lets you load and play
' : multimedia files, such as sound and
' : video.
'-----------------------------------------------------

' -=-=-=- PROPERTIES -=-=-=-
' Filename Determines the name of the current file
' Length The length of the file (Read Only)
' Position The current position through the file
' Status The current status of the object (Read Only)
' Wait True/False...tells VB to wait until play done

' -=-=-=- METHODS -=-=-=-=-
' mmOpen <Filename> Opens the requested filename
' mmClose Closes the current file
' mmPause Pauses playback of the current file
' mmStop Stops playback ready for closedown
' mmSeek <Position> Seeks to a position in the file
' mmPlay Plays the open file

'-------------------------------------------------------------
' NOTES
' -----
'
' Open a file, then play it. Pause it in response to a request
' from the user. Stop if you intend to seek to the start and
' play again. Close when you no longer want to play the file
'--------------------------------------------------------------

Private sAlias As String ' Used internally to give an alias name to
' the multimedia resource

Private sFilename As String ' Holds the filename internally
Private nLength As Single ' Holds the length of the filename
' internally
Private nPosition As Single ' Holds the current position internally
Private sStatus As String ' Holds the current status as a string
Private bWait As Boolean ' Determines if VB should wait until play
' is complete before returning.

'------------ API DECLARATIONS -------------
'note that this is all one code line:
Private Declare Function mciSendString Lib "winmm.dll" _
Alias "mciSendStringA" (ByVal lpstrCommand As String, _
ByVal lpstrReturnString As String, ByVal uReturnLength As Long, _
ByVal hwndCallback As Long) As Long

Public Sub mmOpen(ByVal sTheFile As String)

' Declare a variable to hold the value returned by mciSendString
Dim nReturn As Long

' Declare a string variable to hold the file type
Dim sType As String

' Opens the specified multimedia file, and closes any
' other that may be open
If sAlias <> "" Then
mmClose
End If

' Determine the type of file from the file extension
Select Case UCase$(Right$(sTheFile, 3))
Case "WAV"
sType = "Waveaudio"
Case "AVI"
sType = "AviVideo"
Case "MID"
sType = "Sequencer"
Case Else
' If the file extension is not known then exit the subroutine
Exit Sub
End Select
sAlias = Right$(sTheFile, 3) & Minute(Now)

' At this point there is no file open, and we have determined the
' file type. Now would be a good time to open the new file.
' Note: if the name contains a space we have to enclose it in quotes
If InStr(sTheFile, " ") Then sTheFile = Chr(34) & sTheFile & Chr(34)
nReturn = mciSendString("Open " & sTheFile & " ALIAS " & sAlias _
& " TYPE " & sType & " wait", "", 0, 0)
End Sub

Public Sub mmClose()
' Closes the currently opened multimedia file

' Declare a variable to hold the return value from the mciSendString
' command
Dim nReturn As Long

' If there is no file currently open then exit the subroutine
If sAlias = "" Then Exit Sub

nReturn = mciSendString("Close " & sAlias, "", 0, 0)
sAlias = ""
sFilename = ""

End Sub

Public Sub mmPause()
' Pause playback of the file

' Declare a variable to hold the return value from the mciSendString
' command
Dim nReturn As Long

' If there is no file currently open then exit the subroutine
If sAlias = "" Then Exit Sub

nReturn = mciSendString("Pause " & sAlias, "", 0, 0)

End Sub

Public Sub mmPlay()
' Plays the currently open file, from the current position

' Declare a variable to hold the return value from the mciSendString
' command
Dim nReturn As Long

' If there is no file currently open, then exit the routine
If sAlias = "" Then Exit Sub

' Now play the file
If bWait Then
nReturn = mciSendString("Play " & sAlias & " wait", "", 0, 0)
Else
nReturn = mciSendString("Play " & sAlias, "", 0, 0)
End If
End Sub

Public Sub mmStop()
' Stop using a file totally, be it playing or whatever

' Declare a variable to hold the return value from mciSendString
Dim nReturn As Long

' If there is no file currently open then exit the subroutine
If sAlias = "" Then Exit Sub

nReturn = mciSendString("Stop " & sAlias, "", 0, 0)

End Sub

Public Sub mmSeek(ByVal nPosition As Single)
' Seeks to a specific position within the file

' Declare a variable to hold the return value from the mciSendString
' function
Dim nReturn As Long

nReturn = mciSendString("Seek " & sAlias & " to " & nPosition, "", 0, 0)

End Sub

Property Get Filename() As String
' Routine to return a value when the programmer asks the
' object for the value of its Filename property
Filename = sFilename
End Property

Property Let Filename(ByVal sTheFile As String)
' Routine to set the value of the filename property, should the programmer
' wish to do so. This implies that the programmer actually wants to open
' a file as well so control is passed to the mmOpen routine
mmOpen sTheFile
End Property

Property Get Wait() As Boolean
' Routine to return the value of the object's wait property.
Wait = bWait
End Property

Property Let Wait(bWaitValue As Boolean)
' Routine to set the value of the object's wait property
bWait = bWaitValue
End Property

Property Get Length() As Single
' Routine to return the length of the currently opened multimedia file

' Declare a variable to hold the return value from the mciSendString
Dim nReturn As Long, nLength As Integer

' Declare a string to hold the returned length from the mci Status call
Dim sLength As String * 255

' If there is no file open then return 0
If sAlias = "" Then
Length = 0
Exit Property
End If

nReturn = mciSendString("Status " & sAlias & " length", sLength, 255, 0)
nLength = InStr(sLength, Chr$(0))
Length = Val(Left$(sLength, nLength - 1))
End Property

Property Let Position(ByVal nPosition As Single)
' Sets the Position property effectively by seeking
mmSeek nPosition
End Property

Property Get Position() As Single
' Returns the current position in the file

' Declare a variable to hold the return value from mciSendString
Dim nReturn As Integer, nLength As Integer

' Declare a variable to hold the position returned
' by the mci Status position command
Dim sPosition As String * 255

' If there is no file currently opened then exit the subroutine
If sAlias = "" Then Exit Property

' Get the position and return
nReturn = mciSendString("Status " & sAlias & " position", sPosition, 255, 0)
nLength = InStr(sPosition, Chr$(0))
Position = Val(Left$(sPosition, nLength - 1))

End Property

Property Get Status() As String
' Returns the playback/record status of the current file

' Declare a variable to hold the return value from mciSendString
Dim nReturn As Integer, nLength As Integer

' Declare a variable to hold the return string from mciSendString
Dim sStatus As String * 255

' If there is no file currently opened, then exit the subroutine
If sAlias = "" Then Exit Property

nReturn = mciSendString("Status " & sAlias & " mode", sStatus, 255, 0)

nLength = InStr(sStatus, Chr$(0))
Status = Left$(sStatus, nLength - 1)

End Property

//窗体fm
Dim m As New Mmedia
Dim fn
Private Sub Command1_Click()
On Error GoTo r
dlg.ShowOpen
fn = dlg.Filename
m.mmOpen fn
r:
If Err Then MsgBox Err.Description

End Sub

Private Sub Command2_Click()
On Error GoTo rp
m.mmPlay
rp:
If Err Then MsgBox Err.Description

End Sub

Private Sub Command3_Click()
On Error GoTo rap
m.mmPause
rap:
If Err Then MsgBox Err.Description

End Sub

Private Sub Command4_Click()
On Error GoTo racp
m.mmStop
racp:
If Err Then MsgBox Err.Description

End Sub