设备的开启与操作: 修改设备属性

程序窗口如图所示：

IC Imaging Control 提供了VCDSimpleProperty 类用于调整视频设备：

[C#]
private VCDSimpleProperty vcdProp = null;

[VB.NET]
Private VCDProp As VCDSimpleProperty

程序在Form1_load中创建一个VCDSimpleProperty 类的实例：

[C#]
vcdProp = new VCDSimpleProperty( icImagingControl1.VCDPropertyItems );

[VB.NET]
VCDProp = VCDSimpleModule.GetSimplePropertyContainer(ICImagingControl1.VCDPropertyItems)

程序首先检测设备是否提供亮度自动模式。 如不提供，则复选框Auto (chkBrightnessAuto.Enabled = False) 被设为不可用状态。 如提供，程序将其关闭(VCDProp.Automation(VCDID_Brightness = False):

[C#]
if( !vcdProp.AutoAvailable( VCDIDs.VCDID_Brightness ) )
{
    chkBrightnessAuto.Enabled = false;
}
else
{
    vcdProp.Automation[VCDIDs.VCDID_Brightness] = false;
}

[VB.NET]
If Not VCDProp.AutoAvailable(VCDIDs.VCDID_Brightness) Then
    BrightnessAutoCheckBox.Enabled = False
Else
    VCDProp.Automation(VCDIDs.VCDID_Brightness) = False
End If

而后，程序检测设备是否允许手动调节亮度。 如不允许，程序的slider Brightness (sldBrightness.Enabled = False ) 会被设为不可用状态。 如允许，程序确定设备提供的最小和最大值(VCDProp.RangeMin 和 VCDProp.RangeMax)，以及当前值(VCDProp.RangeValue)， 而后使用这些值初始化sldBrightness 和 lblBrightnessValue：

[C#]
if( !vcdProp.Available( VCDIDs.VCDID_Brightness ) )
{
    sldBrightness.Enabled = false;
}
else
{
    sldBrightness.Minimum = vcdProp.RangeMin(VCDIDs.VCDID_Brightness);
    sldBrightness.Maximum = vcdProp.RangeMax(VCDIDs.VCDID_Brightness);
    sldBrightness.Value = vcdProp.RangeValue[VCDIDs.VCDID_Brightness];
    sldBrightness.TickFrequency = (sldBrightness.Maximum - sldBrightness.Minimum) / 10;
    lblBrightnessValue.Text = sldBrightness.Value.ToString();
}

[VB.NET]
If Not VCDProp.Available(VCDIDs.VCDID_Brightness) Then
    BrightnessTrackBar.Enabled = False
Else
    BrightnessTrackBar.Enabled = True
    BrightnessTrackBar.Minimum = VCDProp.RangeMin(VCDIDs.VCDID_Brightness)
    BrightnessTrackBar.Maximum = VCDProp.RangeMax(VCDIDs.VCDID_Brightness)
    BrightnessTrackBar.Value = VCDProp.RangeValue(VCDIDs.VCDID_Brightness)
    BrightnessTrackBar.TickFrequency = (BrightnessTrackBar.Maximum - BrightnessTrackBar.Minimum) / 10
    BrightnessValueLabel.Text = BrightnessTrackBar.Value
End If

用户调节 slider sldBrightness时，程序把新的亮度值写入设备(VCDProp.RangeValue(VCDID_Brightness)) 并将其显示在程序窗体中 ( lblBrightnessValue):

[C#]
private void sldBrightness_Scroll(object sender, System.EventArgs e)
{
    vcdProp.RangeValue[VCDIDs.VCDID_Brightness] = sldBrightness.Value;
    lblBrightnessValue.Text = sldBrightness.Value.ToString();
}

[VB.NET]
Private Sub BrightnessTrackBar_Scroll(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BrightnessTrackBar.Scroll
    VCDProp.RangeValue(VCDIDs.VCDID_Brightness) = BrightnessTrackBar.Value
    BrightnessValueLabel.Text = VCDProp.RangeValue(VCDIDs.VCDID_Brightness)
End Sub

当用户点击复选框 Auto (chkBrightnessAuto ) 开启自动模式后，程序将开启设备的这项属性(VCDProp.Automation(VCDID_Brightness) = True)，把slider (sldBrightness.Enabled = False)设为不可用状态:

[C#]
private void chkBrightnessAuto_CheckedChanged(object sender, System.EventArgs e)
{
    vcdProp.Automation[VCDIDs.VCDID_Brightness] = chkBrightnessAuto.Checked;
    sldBrightness.Enabled = !chkBrightnessAuto.Checked;
}

[VB.NET]
Private Sub BrightnessAutoCheckBox_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BrightnessAutoCheckBox.CheckedChanged
    VCDProp.Automation(VCDIDs.VCDID_Brightness) = BrightnessAutoCheckBox.Checked
    BrightnessTrackBar.Enabled = Not BrightnessAutoCheckBox.Checked
End Sub

设备其它属性的调整与本例类似，详细信息请参阅 IC Imaging Control 使用指南。