Vb.net 如何使用EDSDKWrapper C库使用佳能相机拍照？

我正在使用Canon SDK和EDSDKWrapper C库编写一个VB.NET应用程序，因为我的编程技能不足以处理C代码或指针、处理程序等。以下是我迄今为止的代码，它使用计时器在图片框中显示LiveView图像：

Public Class Form1

Dim frameworkManager As New EDSDKWrapper.Framework.Managers.FrameworkManager
Dim camera As EDSDKWrapper.Framework.Objects.Camera

Private Sub Form1_FormClosing(sender As Object, e As FormClosingEventArgs) Handles Me.FormClosing
    tmrLiveView.Enabled = False
    camera.StopLiveView() ' Clean up
End Sub

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    camera = frameworkManager.GetCameras().FirstOrDefault ' Get our first or default camera that's plugged in
    camera.LiveViewOutputDevice = EDSDKWrapper.Framework.Enums.LiveViewOutputDevice.Computer ' LiveView on the computer only, please
    camera.StartLiveView() ' Begin the LiveView
    tmrLiveView.Enabled = True ' Turn our timer on
End Sub

Private Sub tmrLiveView_Tick(sender As Object, e As EventArgs) Handles tmrLiveView.Tick
    Dim str As IO.Stream ' Holds our LiveView image
    str = camera.GetLiveViewImage() ' Get the image (which comes back as a stream)
    picLiveview.Image = System.Drawing.Image.FromStream(str) ' To the picturebox from the stream
End Sub

Private Sub btnFocus_Click(sender As Object, e As EventArgs) Handles btnFocus.Click
    ' But what goes here?
End Sub

End Class

但是我怎么拍照呢？据我所知，我需要这样做：

EDSDKWrapper.Framework.Invokes.EDSDKInvokes.SendCommand(inCameraRef, EDSDKWrapper.Framework.Enums.CameraCommand.PressShutterButton,0)

但我不知道如何获得inCameraRef，我相信这是我想要发送命令的相机的手柄。我假设camera类中有一个属性会返回这个，但我不确定

以前有人用过这个包装器吗，或者他们能推荐一个好的佳能SDK包装器吗？时间是宝贵的，我在互联网上搜索了太长时间