How to get value of device capability?
In This Topic
Here is an example that demonstrates how to get information about all pixel types supported by the device using properties and methods of capability:
/// <summary>
/// Get information about pixel types supported by device.
/// </summary>
public void GetPixelTypesInfo(Vintasoft.Twain.Device device)
{
// open the device
device.Open();
// get reference to the object that manipulates IPixelType capability
Vintasoft.Twain.DeviceCapability pixelTypeCap = device.Capabilities.Find(Vintasoft.Twain.DeviceCapabilityId.IPixelType);
// if the IPixelType capability is supported
if (pixelTypeCap != null)
{
// get information about current, default and supported values of capability
Vintasoft.Twain.TwainValueContainerBase capValue = pixelTypeCap.GetValue();
switch (capValue.ContainerType)
{
case Vintasoft.Twain.TwainValueContainerType.Enum:
Vintasoft.Twain.TwainEnumValueContainer capValueAsEnum = (Vintasoft.Twain.TwainEnumValueContainer)capValue;
System.Array enumValues = capValueAsEnum.EnumValues;
// output the capability values in human readable format
System.Console.WriteLine(string.Format("Current pixel type: {0}", enumValues.GetValue(capValueAsEnum.ValueIndex)));
System.Console.WriteLine(string.Format("Default pixel type: {0}", enumValues.GetValue(capValueAsEnum.DefaultValueIndex)));
System.Console.Write("Supported pixel types:");
for (int i = 0; i < enumValues.Length; i++)
System.Console.Write(string.Format(" {0}", enumValues.GetValue(i)));
break;
}
System.Console.WriteLine();
}
// close the device
device.Close();
}
''' <summary>
''' Get information about pixel types supported by device.
''' </summary>
Public Sub GetPixelTypesInfo(ByVal device As Vintasoft.Twain.Device)
' open the device
device.Open()
' get reference to the object that manipulates IPixelType capability
Dim pixelTypeCap As Vintasoft.Twain.DeviceCapability = device.Capabilities.Find(Vintasoft.Twain.DeviceCapabilityId.IPixelType)
' if the IPixelType capability is supported
If pixelTypeCap IsNot Nothing Then
' get information about current, default and supported values of capability
Dim capValue As Vintasoft.Twain.TwainValueContainerBase = pixelTypeCap.GetValue()
Select Case capValue.ContainerType
Case Vintasoft.Twain.TwainValueContainerType.[Enum]
Dim capValueAsEnum As Vintasoft.Twain.TwainEnumValueContainer = DirectCast(capValue, Vintasoft.Twain.TwainEnumValueContainer)
Dim enumValues As Array = capValueAsEnum.EnumValues
' output the capability values in human readable format
Console.WriteLine(String.Format("Current pixel type: {0}", enumValues.GetValue(capValueAsEnum.ValueIndex)))
Console.WriteLine(String.Format("Default pixel type: {0}", enumValues.GetValue(capValueAsEnum.DefaultValueIndex)))
Console.Write("Supported pixel types:")
For i As Integer = 0 To enumValues.Length - 1
Console.Write(String.Format(" {0}", enumValues.GetValue(i)))
Next
Exit Select
End Select
Console.WriteLine()
End If
' close the device
device.Close()
End Sub