private static int GetInterfaceDetailBufferSize(DeviceInfoSet deviceInfo, Wrapper.SpDeviceInterfaceData deviceInterfaceData)
{
int bufferSize = 0;
bool isSuccessful = Wrapper.SetupDiGetDeviceInterfaceDetail(deviceInfo.Handle.DangerousGetHandle(), ref deviceInterfaceData, default(IntPtr), 0, ref bufferSize, default(IntPtr));
var errorCode = Marshal.GetLastWin32Error();
if (!isSuccessful && errorCode != Wrapper.Win32ErrorInsufficientBuffer)
{
throw new Win32Exception(errorCode);
}
return(bufferSize);
}
private static string GetDeviceFileInstancePath(DeviceInfoSet deviceInfo, Wrapper.SpDeviceInterfaceData deviceInterfaceData)
{
int bufferSize = GetInterfaceDetailBufferSize(deviceInfo, deviceInterfaceData);
using (var interfaceDetailBuffer = new DeviceInterfaceDetailData(bufferSize))
{
bool isSuccessful = Wrapper.SetupDiGetDeviceInterfaceDetail(deviceInfo.Handle.DangerousGetHandle(),
ref deviceInterfaceData,
interfaceDetailBuffer.Handle.DangerousGetHandle(),
bufferSize,
ref bufferSize,
default(IntPtr));
var errorCode = Marshal.GetLastWin32Error();
if (!isSuccessful)
{
throw new Win32Exception(errorCode);
}
return(interfaceDetailBuffer.GetPathName());
}
}
private static IEnumerable <Tuple <int, Wrapper.SpDeviceInterfaceData> > EnumerateDeviceInterfaces(DeviceInfoSet deviceInfoSet, Guid deviceGuid)
{
bool isEnumerationCompleted;
var memberIndex = -1;
do
{
var deviceInformationData = new Wrapper.SpDeviceInterfaceData(true);
memberIndex++;
bool deviceAvailable = Wrapper.SetupDiEnumDeviceInterfaces(deviceInfoSet.Handle.DangerousGetHandle(), IntPtr.Zero, ref deviceGuid, memberIndex, ref deviceInformationData);
isEnumerationCompleted = Marshal.GetLastWin32Error().Equals(Wrapper.Win32ErrorNoMoreItems);
if (!deviceAvailable)
{
continue;
}
yield return(new Tuple <int, Wrapper.SpDeviceInterfaceData>(memberIndex, deviceInformationData));
} while (!isEnumerationCompleted);
}
