1、全局代码

Public _Cams As DCap.Filters = New DCap.Filters()

改成

Public _Cams As DCap.Filters

2、afterLoad事件

try
    Dim cmr As New DCap.Filters()
catch ex As exception
    msgbox("没有设备")
    \'Return
    e.Form.close
End try

Dim camList As WinForm.ComboBox = e.Form.Controls("CamList")
\'设置控件大小
Functions.Execute("SetCamBoxSize",e.Form,True)
\'设置移动条
e.Form.Controls("BarX").Value = e.Form.Controls("LineBox").Left - e.Form.Controls("CamViewBox").Left
e.Form.Controls("BarY").Value = e.Form.Controls("CamViewBox").Height - (e.Form.Controls("LineBox").Top - e.Form.Controls("CamViewBox").Top)
e.Form.Controls("BarW").Value = e.Form.Controls("LineBox").Width
e.Form.Controls("BarH").Value = e.Form.Controls("CamViewBox").Height - e.Form.Controls("LineBox").Height
\'显示拍照框尺寸
e.Form.Controls("BoxW").Value = e.Form.Controls("LineBox").Width
e.Form.Controls("BoxH").Value = e.Form.Controls("LineBox").Height
_lVars(0) = e.Form.Controls("AutoTake").Checked
\'设置保存路径
If _sVars(0) <> ""
    e.Form.Controls("FileName").Value = _sVars(0)
End If
\'获取摄像头列表
Functions.Execute("GetCams")
\'显示摄像头列表
Dim i As Integer
camList.Items.Clear
For i=0 To _CamList.Count - 1
    camList.Items.Add(_CamList(i))
Next
\'默认选中第一个摄像头
If _CamList.Count > 1 And _CamIndex < 1
    _CamIndex = 1
End If
camList.SelectedIndex = _CamIndex
\'激活预览
If _CamList.Count > 0
    Functions.Execute("SetCamView",_CamIndex,e.Form.Controls("CamView"))
Else
    MessageBox.Show("未检测摄像头,请先连接摄像头!","警告")
    e.Form.Close()
End If
\'启动定时器
_iVars(0) = 0
e.Form.TimerEnabled = True