private static object GetDeviceRegistryProperty(IntPtr h, ref Hardware.SP_DEVINFO_DATA devInfo, RegistryProperty property)
{
RegistryDataType dataType;
uint bufferLength;
SetupDiGetDeviceRegistryProperty(h, ref devInfo, property, out dataType, IntPtr.Zero, 0, out bufferLength);
object result = null;
IntPtr buffer = Marshal.AllocHGlobal((int)bufferLength);
if (SetupDiGetDeviceRegistryProperty(h, ref devInfo, property, out dataType, buffer, bufferLength, out bufferLength)) {
switch (dataType) {
case RegistryDataType.REG_SZ:
result = Marshal.PtrToStringAuto(buffer);
break;
case RegistryDataType.REG_MULTI_SZ:
var bytes = PtrToByteArray(buffer, bufferLength);
var text = Encoding.Unicode.GetString(bytes);
result = text.TrimEnd('\0').Split('\0');
break;
case RegistryDataType.REG_BINARY:
result = PtrToByteArray(buffer, bufferLength);
break;
case RegistryDataType.REG_DWORD:
result = Marshal.ReadInt32(buffer);
break;
default:
throw new Exception(string.Format("Unsupported data type: {0}", dataType));
}
}
Marshal.FreeHGlobal(buffer);
return result;
}
protected static extern bool SetupDiGetDeviceRegistryProperty(IntPtr DeviceInfoSet, ref DeviceInfoData DeviceInfoData, RegistryProperty Property, out RegistryValueKind PropertyRegDataType, IntPtr PropertyBuffer, uint PropertyBufferSize, out uint RequiredSize);
static string ReadPropertyString(IntPtr infoSetPtr, ref DeviceInfoData deviceInfo, RegistryProperty property)
{
RegistryValueKind valueKind;
uint requiredSize;
SetupDiGetDeviceRegistryProperty(infoSetPtr, ref deviceInfo, property, out valueKind, IntPtr.Zero, 0, out requiredSize);
var lastError = Marshal.GetLastWin32Error();
if (ERROR_INSUFFICIENT_BUFFER == lastError)
{
Contract.Assert(new[]
{
RegistryValueKind.ExpandString,
RegistryValueKind.MultiString,
RegistryValueKind.String
}
.Contains(valueKind));
IntPtr buffer = Marshal.AllocHGlobal((int)requiredSize);
try
{
if (SetupDiGetDeviceRegistryProperty(infoSetPtr, ref deviceInfo, property, out valueKind, buffer, requiredSize, out requiredSize))
{
return(Marshal.PtrToStringAuto(buffer));
}
lastError = Marshal.GetLastWin32Error();
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}
if (ERROR_INVALID_DATA == lastError)
{
return(string.Empty);
}
throw new Win32Exception(lastError)
{
Source = "WinUSB.SetupDiGetDeviceRegistryProperty"
};
}
protected static extern bool SetupDiGetDeviceRegistryProperty(IntPtr DeviceInfoSet, ref DeviceInfoData DeviceInfoData, RegistryProperty Property, out RegistryValueKind PropertyRegDataType, IntPtr PropertyBuffer, uint PropertyBufferSize, out uint RequiredSize);
