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#1 Posted : Wednesday, August 12, 2009 1:06:12 AM(UTC)
JOO HYUN YOON

Groups: Registered
Posts: 16


Hi,

I am using LTMM V.16 for capture application. (Vb.net Multimedia capture)

And I have one question about connection of device.

In the code, when I make device menu, we use a loop for checking usb device.

For i = 0 To count - 1
name = AxltmmCaptureCtrl1.VideoDevices.Item(i).FriendlyName

If (name = "My Device Name") Then

AxltmmCaptureCtrl1.VideoDevices.Item(i).Selected = True
DeviceName = AxltmmCaptureCtrl1.VideoDevices.Item(i).FriendlyName
Exit Sub

End If
Next

After that, the application can check my machine name and can run application.

I want to check disconnect status.

After running application, I checked new loop for using timer for checking device name and number of array.

But after event of machine disconnection, I can not get different name and array before event.

Therefore I can not check my status of machine.

It is my code sample. please let me know how to check machine connection.

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


count = AxltmmCaptureCtrl1.VideoDevices.Count


If (count > 0) Then
For i = 0 To count - 1
name = AxltmmCaptureCtrl1.VideoDevices.Item(i).FriendlyName

If (name = "My Device Name") Then
AxltmmCaptureCtrl1.VideoDevices.Item(i).Selected = True
DeviceName = AxltmmCaptureCtrl1.VideoDevices.Item(i).FriendlyName
Exit Sub

End If
Next

End If

VideoCheckTimer.Enabled = True
End Sub


Private Sub VideoCheckTimer_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles VideoCheckTimer.Tick
Dim count As Integer
Dim k As Integer
Dim name As String

count = AxltmmCaptureCtrl1.VideoDevices.Count

If (count > 0) Then
For k = 0 To count - 1
name = AxltmmCaptureCtrl1.VideoDevices.Item(k).FriendlyName
Next

End If

name = AxltmmCaptureCtrl1.VideoDevices.Item(DeviceIndex).FriendlyName
If Not (DeviceName = name) Then

VideoCheckTimer.Enabled = False
If (MessageBox.Show("Fail to find USB device driver. Check the USB plug or the power of the USB set.", "SDP-860 Error", MessageBoxButtons.OK, _
MessageBoxIcon.Warning) = Windows.Forms.DialogResult.OK) Then
Me.Close()
End If

End If
End Sub
 

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#2 Posted : Wednesday, August 12, 2009 6:56:41 AM(UTC)

Adnan Ismail  
Guest

Groups: Guests
Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

In your timer code, call the following function to rebuild the device collection:
AxltmmCaptureCtrl1.VideoDevices.Refresh()

When you disconnect one of the devices, this function will rebuild the list without it.
 
#3 Posted : Thursday, August 13, 2009 2:07:11 AM(UTC)
JOO HYUN YOON

Groups: Registered
Posts: 16


Thank you for your answer,

But when i use AxltmmCaptureCtrl1.VideoDevices.Refresh(),
it rebuild device collection and reconnect device index.

I want to rebuild device collection without reconnect device(It cause screen flash by periods.)

 
#4 Posted : Thursday, August 13, 2009 7:07:36 AM(UTC)

Adnan Ismail  
Guest

Groups: Guests
Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

You can refresh the video devices in a different control. This way, it will not affect the used control and it can tell you if the number of devices has changed or not.
 
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