//
private MorphicResult <GetValueAndTypeAsObjectResult, RegistryValueError> GetValueAndTypeAsObject(string?name)
{
var handleAsUIntPtr = (UIntPtr)(_handle.DangerousGetHandle().ToInt64());
// pass 1: set dataSize to zero (so that RegQueryValueEx returns the size of the value
uint dataSize = 0;
ExtendedPInvoke.RegistryValueType valueType;
var queryValueErrorCode = ExtendedPInvoke.RegQueryValueEx(handleAsUIntPtr, name, IntPtr.Zero, out valueType, IntPtr.Zero, ref dataSize);
switch (queryValueErrorCode)
{
case PInvoke.Win32ErrorCode.ERROR_SUCCESS:
break;
case PInvoke.Win32ErrorCode.ERROR_FILE_NOT_FOUND:
return(MorphicResult.ErrorResult(RegistryValueError.ValueDoesNotExist));
default:
// NOTE: in the future, we may want to consider returning a specific result (i.e. "could not open for write access" etc.)
return(MorphicResult.ErrorResult(RegistryValueError.Win32Error((int)queryValueErrorCode)));
}
// pass 2: capture the actual data
var getValueResult = RegistryKey.GetValueForHandleAsUInt32(handleAsUIntPtr, name, dataSize);
if (getValueResult.IsError)
{
return(MorphicResult.ErrorResult(getValueResult.Error !));
}
var data = getValueResult.Value;
return(MorphicResult.OkResult(new GetValueAndTypeAsObjectResult(data, valueType)));
}
private static MorphicResult <uint, RegistryValueError> GetValueForHandleAsUInt32(UIntPtr handle, string?name, uint dataSize)
{
var ptrToData = Marshal.AllocHGlobal((int)dataSize);
try
{
var mutableDataSize = dataSize;
ExtendedPInvoke.RegistryValueType valueType;
var queryValueErrorCode = ExtendedPInvoke.RegQueryValueEx(handle, name, IntPtr.Zero, out valueType, ptrToData, ref mutableDataSize);
switch (queryValueErrorCode)
{
case PInvoke.Win32ErrorCode.ERROR_SUCCESS:
break;
default:
// NOTE: in the future, we may want to consider returning a specific result (i.e. "could not open for write access" etc.)
return(MorphicResult.ErrorResult(RegistryValueError.Win32Error((int)queryValueErrorCode)));
}
// validate value type and data size
if (valueType != ExtendedPInvoke.RegistryValueType.REG_DWORD)
{
return(MorphicResult.ErrorResult(RegistryValueError.TypeMismatch));
}
//
if (mutableDataSize != dataSize)
{
return(MorphicResult.ErrorResult(RegistryValueError.TypeMismatch));
}
// capture and return result
var data = Marshal.PtrToStructure <uint>(ptrToData);
return(MorphicResult.OkResult(data));
}
finally
{
Marshal.FreeHGlobal(ptrToData);
}
}
