internal Device(DeviceClass deviceClass, Native.SP_DEVINFO_DATA deviceInfoData, string path, int index)
{
if (deviceClass == null)
throw new ArgumentNullException("deviceClass");
if (deviceInfoData == null)
throw new ArgumentNullException("deviceInfoData");
_deviceClass = deviceClass;
_path = path; // may be null
_deviceInfoData = deviceInfoData;
_index = index;
}
internal Volume(DeviceClass deviceClass, Native.SP_DEVINFO_DATA deviceInfoData, string path, int index)
: base(deviceClass, deviceInfoData, path, index)
{
}
internal override Device CreateDevice(DeviceClass deviceClass, Native.SP_DEVINFO_DATA deviceInfoData, string path, int index)
{
return new Volume(deviceClass, deviceInfoData, path, index);
}
internal Guid GetProperty(Native.SP_DEVINFO_DATA devData, int property, Guid defaultValue)
{
if (devData == null)
throw new ArgumentNullException("devData");
int propertyRegDataType = 0;
int requiredSize;
int propertyBufferSize = Marshal.SizeOf(typeof(Guid));
IntPtr propertyBuffer = Marshal.AllocHGlobal(propertyBufferSize);
if (!Native.SetupDiGetDeviceRegistryProperty(_deviceInfoSet,
devData,
property,
out propertyRegDataType,
propertyBuffer,
propertyBufferSize,
out requiredSize))
{
Marshal.FreeHGlobal(propertyBuffer);
int error = Marshal.GetLastWin32Error();
if (error != Native.ERROR_INVALID_DATA)
throw new Win32Exception(error);
return defaultValue;
}
Guid value = (Guid)Marshal.PtrToStructure(propertyBuffer, typeof(Guid));
Marshal.FreeHGlobal(propertyBuffer);
return value;
}
internal virtual Device CreateDevice(DeviceClass deviceClass, Native.SP_DEVINFO_DATA deviceInfoData, string path, int index)
{
return new Device(deviceClass, deviceInfoData, path, index);
}
