My Third Capture (Visual Basic)

The ltmmCaptureCtrl object allows the user to capture data from video and audio hardware devices. Using the following steps:

1.	Start with the project that you created in My First Capture.
2.	Choose Tools –> Menu Editor menu item.
3.	Add 1 Main menu items and 1 sub menu item to this main menu item and name them as follows. Note that menuVideoDevice is the menu item, and menuVideoDeviceAll is the sub menu item of it.

Name	Caption	Index
menuVideoDevice	&Video Device	Don’t fill it.
menuVideoDeviceAll	&None	0

4.	Add another 1 Main menu items and another 1 sub menu item to this main menu item and name them as follows. Note that menuAudioDevice is the menu item, and menuAudioDeviceAll is the sub menu item of it.

Name	Caption	Index
menuAudioDevice	&Audio Device	Don’t fill it.
menuAudioDeviceAll	&None	0

5.	Update the Form_Load Sub to be as follows:

Private Sub Form_Load()
   'use preview
   ltmmCaptureCtrl1.Preview = True
   'select first video device
   ltmmCaptureCtrl1.VideoDevices.Selection = 0
   'Set the Target File.
   ltmmCaptureCtrl1.TargetFile = "c:\target.avi"
   'Enumerate the Video\Audio devices.
   BuildDeviceMenu
   ' update the menu items
   UpdateMenuStatus
End Sub

6.	Update the btnStartCapture_Click to be as follows:

Private Sub btnStartCapture_Click()
ltmmCaptureCtrl1.StartCapture ltmmCapture_Mode_VideoOrAudio
End Sub

7.	Handle the menuVideoDeviceAll sub menu item Click event, and code menuVideoDeviceAll_Click Sub as follows:

Private Sub menuVideoDeviceAll_Click(Index As Integer)
   Dim devices As IltmmDevices

   MousePointer = vbHourglass
   Set devices = ltmmCaptureCtrl1.VideoDevices
   devices.Selection = menuVideoDeviceAll(Index).Tag
   MousePointer = crDefault
   UpdateMenuStatus
End Sub

8.	Handle the menuAudioDeviceAll sub menu item Click event, and code menuAudioDeviceAll_Click Sub as follows:

Private Sub menuAudioDeviceAll_Click(Index As Integer)
   Dim devices As IltmmDevices

   MousePointer = vbHourglass
   Set devices = ltmmCaptureCtrl1.AudioDevices
   devices.Selection = menuAudioDeviceAll(Index).Tag
   Cursor = crDefault
   UpdateMenuStatus
End Sub

9.	Add the body of BuildDeviceMenu, and UpdateMenuStatus Subs to your project.

Sub BuildDeviceMenu()
   Dim count As Integer
   Dim i As Integer
   Dim name As String

   count = ltmmCaptureCtrl1.VideoDevices.count
   ' Adding the 'None' menu Item.
   ' Set the caption to 'None'.
   menuVideoDeviceAll(0).Caption = "None"
   ' set the Tag to -1 to use it when we will set the Selection Property.
   menuVideoDeviceAll(0).Tag = -1

   If (count > 0) Then
      ' Setect the first device.
      ltmmCaptureCtrl1.VideoDevices.Selection = 0
      ' Adding the Video Devices to the Video Device menu item.
      For i = 0 To count - 1
         'device:= devices.Item ( i )
         ' Get the Device name
         name = ltmmCaptureCtrl1.VideoDevices.Item(i).FriendlyName
         ' Create the Menu Item.
         Load menuVideoDeviceAll(i + 1)
         ' Assign the caption to the device name.
         menuVideoDeviceAll(i + 1).Caption = name
         ' set the Tag to i to use it when we will set the Selection Property.
         menuVideoDeviceAll(i + 1).Tag = i
      Next
   End If

   count = ltmmCaptureCtrl1.AudioDevices.count
   ' Adding the 'None' menu Item.
   ' Set the caption to 'None'.
   menuAudioDeviceAll(0).Caption = "None"
   ' set the Tag to -1 to use it when we will set the Selection Property.
   menuAudioDeviceAll(0).Tag = -1

   If (count > 0) Then
      ' Setect the first device.
      ltmmCaptureCtrl1.AudioDevices.Selection = 0
      ' Adding the Video Devices to the Video Device menu item.
      For i = 0 To count - 1
         'device:= devices.Item ( i )
         ' Get the Device name
         name = ltmmCaptureCtrl1.AudioDevices.Item(i).FriendlyName
         ' Create the Menu Item.
         Load menuAudioDeviceAll(i + 1)
         ' Assign the caption to the device name.
         menuAudioDeviceAll(i + 1).Caption = name
         ' set the Tag to i to use it when we will set the Selection Property.
         menuAudioDeviceAll(i + 1).Tag = i
      Next
   End If
End Sub

Sub UpdateMenuStatus()
   Dim i As Integer
   Dim Index As Integer
   Dim state As Boolean
   Dim devices As ltmmDevices

   state = (ltmmCaptureCtrl1.state <> ltmmCapture_State_Running)

   ' Video Devices menu item
   Set devices = ltmmCaptureCtrl1.VideoDevices
   Index = devices.Selection

   For i = 0 To devices.count
      menuVideoDeviceAll(i).Enabled = state
   Next

   For i = 0 To ltmmCaptureCtrl1.VideoDevices.count
      If (menuVideoDeviceAll(i).Tag = Index) Then
         menuVideoDeviceAll(i).Checked = True
      Else
         menuVideoDeviceAll(i).Checked = False
      End If
   Next

   ' Audio Devices menu item
   Set devices = ltmmCaptureCtrl1.AudioDevices
   Index = devices.Selection

   For i = 0 To devices.count
      menuAudioDeviceAll(i).Enabled = state
   Next

   For i = 0 To devices.count
      If (menuAudioDeviceAll(i).Tag = Index) Then
         menuAudioDeviceAll(i).Checked = True
      Else
         menuAudioDeviceAll(i).Checked = False
      End If
   Next

End Sub

10.	Handle the ltmmCaptureCtrl1 Complete event, and code the ltmmCaptureCtrl1_Complete Sub as follows:

Private Sub ltmmCaptureCtrl1_Complete ()
Caption = "Complete"
End Sub

11.	Handle the ltmmCaptureCtrl1 ErrorAbort event, and code the ltmmCaptureCtrl1_ErrorAbort Sub as follows:

Private Sub ltmmCaptureCtrl1_ErrorAbort(ByVal ErrorCode As Long)
Caption = "Aborted"
MsgBox "Capture Aborted. Error " + CStr(ErrorCode)
End Sub

12.	Handle the ltmmCaptureCtrl1 Progress event, and code the ltmmCaptureCtrl1_Progress Sub as follows:

Private Sub ltmmCaptureCtrl1_Progress(ByVal Time As Long)
   Dim str1 As String
   Dim str2 As String
   Dim str3 As String
   Dim str4 As String

   str1 = "Dropped " + CStr(ltmmCaptureCtrl1.NumDropped)
   str2 = "Not Dropped " + CStr(ltmmCaptureCtrl1.NumNotDropped)
   str3 = "Frm. Size " + CStr(ltmmCaptureCtrl1.AverageFrameSize)
   If ((ltmmCaptureCtrl1.Mode = ltmmCapture_Mode_Still) Or (ltmmCaptureCtrl1.Mode = ltmmCapture_Mode_ManualFrames)) Then
      str4 = ""
   Else
      str4 = CStr(ltmmCaptureCtrl1.CaptureTime)
   End If
   Caption = str1 + " " + str2 + " " + str3 + " " + str4
End Sub

13.	Handle the ltmmCaptureCtrl1 Started event, and code the ltmmCaptureCtrl1_Started Sub as follows:

Private Sub ltmmCaptureCtrl1_Started ()
Caption = "Started"
End Sub

14.	Run your program to test it.