MCI播放器在VB中实现

''''用MCI命令来实现多媒体的播放功能
''''下面的内容几乎有播放器软件的各种功能，你只是引用这些函数就能做出一个播放器来
''''

Public 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 Declare Function mciGetDeviceID Lib "winmm.dll" Alias "mciGetDeviceIDA" (ByVal lpstrName As String) As Long

Public Declare Function waveOutGetVolume Lib "winmm.dll" (ByVal uDeviceID As Long, lpdwVolume As Long) As Long

Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long

Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Public Declare Function GetShortPathName Lib "kernel32" Alias "GetShortPathNameA" (ByVal lpszLongPath As String, ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long

Enum PlayTypeName
File = 1
CDAudio = 2
VCD = 3
RealPlay = 4
End Enum
Dim PlayType As PlayTypeName
Enum AudioSource
AudioStereo = 0 '''' "stereo"
AudioLeft = 1 ''''"left"
AudioRight = 2 ''''"right"
End Enum
Dim hWndMusic As Long
Dim prevWndproc As Long

''''=======================================================
''''打开MCI设备，urlStr为网址,传值代表成功与否
''''=======================================================
Public Function OpenURL(urlStr As String, Optional hwnd As Long) As Boolean
OpenMusic = False
Dim MciCommand As String
Dim DriverID As String

CloseMusic
''''MCI命令
DriverID = GetDriverID(urlStr)
If DriverID = "RealPlayer" Then
PlayType = RealPlay
Exit Function
End If
MciCommand = "open " & urlStr & " type " & DriverID & " alias NOWMUSIC"

If DriverID = "AVIVideo" Or DriverID = "MPEGVideo" Or DriverID = "MPEGVideo2" Then
If hwnd <> 0 Then
MciCommand = MciCommand " parent " & hwnd & " style child"
hWndMusic = GetWindowHandle
prevWndproc = GetWindowLong(hWndMusic, -4)
SetWindowLong hWndMusic, -4, AddressOf WndProc

Else
MciCommand = MciCommand " style overlapped "
End If
End If

RefInt = mciSendString(MciCommand, vbNull, 0, 0)
mciSendString "set NOWMUSIC time format milliseconds", vbNullString, 0, 0
If RefInt = 0 Then OpenMusic = True

End Function
''''=======================================================
''''打开MCI设备，FILENAME为文件名,传值代表成功与否
''''=======================================================
Public Function OpenMusic(FileName As String, Optional hwnd As Long) As Boolean
OpenMusic = False
Dim ShortPathName As String * 255
Dim RefShortName As String
Dim RefInt As Long
Dim MciCommand As String
Dim DriverID As String

CloseMusic
''''获取短文件名
GetShortPathName FileName, ShortPathName, 255
RefShortName = Left(ShortPathName, InStr(1, ShortPathName, Chr(0)) - 1)
''''MCI命令
DriverID = GetDriverID(RefShortName)
If DriverID = "RealPlayer" Then
PlayType = RealPlay
Exit Function
End If
MciCommand = "open " & RefShortName & " type " & DriverID & " alias NOWMUSIC"

If DriverID = "AVIVideo" Or DriverID = "MPEGVideo" Or DriverID = "MPEGVideo2" Then
If hwnd <> 0 Then
MciCommand = MciCommand " parent " & hwnd & " style child"
hWndMusic = GetWindowHandle
prevWndproc = GetWindowLong(hWndMusic, -4)
SetWindowLong hWndMusic, -4, AddressOf WndProc

Else
MciCommand = MciCommand " style overlapped "
End If
End If

RefInt = mciSendString(MciCommand, vbNull, 0, 0)
mciSendString "set NOWMUSIC time format milliseconds", vbNullString, 0, 0
If RefInt = 0 Then OpenMusic = True

End Function
Function WndProc(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If Msg = &H202 Then
MsgBox "OK"
End If
WndProc = CallWindowProc(prevWndproc, hwnd, Msg, wParam, lParam)
End Function
''''=======================================================
''''根据文件名，确定设备
''''=======================================================
Public Function GetDriverID(ff As String) As String

标签：

版权申明：本站文章部分自网络，如有侵权，请联系：west999com@outlook.com
特别注意：本站所有转载文章言论不代表本站观点，本站所提供的摄影照片，插画，设计作品，如需使用，请与原作者联系，版权归原作者所有