vb6中用图片框任意大小播放AVI电影（New）

1. 新建工程，增加一个bas模块
2. 加入一个MCI控件，一个command按钮和一个图片框，设置form的
   ScaleMode property为 Pixels (3).
   
3. .BAS 文件代码:

   
   
      Type RECT
   
         Left As Long
   
         Top As Long
   
         Right As Long
   
         Bottom As Long
   
      End Type
   
   
   
      Type MCI_OVLY_RECT_PARMS
   
         dwCallback As Long
   
         rc As RECT
   
      End Type
   
   
   
      Global Const MCI_OVLY_WHERE_SOURCE = &H20000
   
      Global Const MCI_OVLY_WHERE_DESTINATION = &H40000
   
      Global Const MCI_WHERE = &H843
   
   
   
      
   
      Declare Function mciSendCommand Lib "winmm.dll" _
   
         Alias "mciSendCommandA" ( _
   
            ByVal wDeviceID As Long, _
   
            ByVal uMessage As Long, _
   
            ByVal dwParam1 As Long,
   
            dwParam2 As Any) As Long
   
   
   
      Declare Function mciGetErrorString Lib "winmm.dll" _
   
         Alias "mciGetErrorStringA" ( _
   
            ByVal dwError As Long, _
   
            ByVal lpstrBuffer As String, _
   
            ByVal uLength As Long) As Long
   
    

   
   
   

 Command1_Click()事件:

   Sub Command1_Click ()

      Const MB_OK = 0

      Const MB_ICONSTOP = 16



      Dim Retval&, Buffer$

      Dim dwParam2 As MCI_OVLY_RECT_PARMS



      MMControl1.Command = "Close"

      MMControl1.Filename = "WndSurf1.avi"  '

      

      MMControl1.hWndDisplay = Picture1.hWnd



      MMControl1.Command = "Open"



      '初始化

      dwParam2.dwCallback = MMControl1.hWnd

      dwParam2.rc.Left = 0

      dwParam2.rc.Top = 0

      dwParam2.rc.Right = 0

      dwParam2.rc.Bottom = 0



      '发送消息

            Retval& = mciSendCommand(MMControl1.DeviceID, MCI_WHERE,

                MCI_OVLY_WHERE_SOURCE, dwParam2)



      If Retval& <> 0 Then  '错误发生.

         Buffer$ = Space$(100)

         'Get a description of the error:

         Retval& = mciGetErrorString(Retval&, Buffer$, Len(Buffer$))

         MsgBox Trim$(Buffer$), MB_OK + MB_ICONSTOP, "ERROR"

      Else

         '改变picture box大小:

         Picture1.Width = dwParam2.rc.right - dwParam2.rc.left

         Picture1.Height = dwParam2.rc.bottom - dwParam2.rc.top



         '播放电影

         MMControl1.Wait = True ' Wait for the next command to complete

         MMControl1.Command = "play" 'Play the video clip

         MMControl1.Command = "close"

      End If

   End Sub

 

1. 按f5运行程序