public S7VariableAddress Parse(string input)
{
var match = regex.Match(input);
if (match.Success)
{
var operand = (Operand)Enum.Parse(typeof(Operand), match.Groups["operand"].Value, true);
var dbNr = ushort.Parse(match.Groups["dbNr"].Value, NumberStyles.Integer);
var start = ushort.Parse(match.Groups["start"].Value, NumberStyles.Integer);
var type = ParseType(match.Groups["type"].Value);
var s7VariableAddress = new S7VariableAddress
{
Operand = operand,
DbNr = dbNr,
Start = start,
Type = type,
};
if (type == DbType.Bit)
{
s7VariableAddress.Length = 1;
s7VariableAddress.Bit = byte.Parse(match.Groups["bitOrLength"].Value);
}
else if (type == DbType.Byte)
{
s7VariableAddress.Length = match.Groups["bitOrLength"].Success ? ushort.Parse(match.Groups["bitOrLength"].Value) : (ushort)1;
}
else if (type == DbType.String)
{
s7VariableAddress.Length = match.Groups["bitOrLength"].Success ? ushort.Parse(match.Groups["bitOrLength"].Value) : (ushort)0;
}
else if (type == DbType.Integer)
{
s7VariableAddress.Length = 2;
}
else if (type == DbType.DInteger)
{
s7VariableAddress.Length = 4;
}
else if (type == DbType.ULong)
{
s7VariableAddress.Length = 8;
}
return(s7VariableAddress);
}
return(null);
}
private TValue ConvertToType <TValue>(byte[] buffer, S7VariableAddress address)
{
if (typeof(TValue) == typeof(bool))
{
return((TValue)(object)Convert.ToBoolean(buffer[0] & (1 << address.Bit)));
}
if (typeof(TValue) == typeof(int))
{
if (address.Length == 2)
{
return((TValue)(object)((buffer[0] << 8) + buffer[1]));
}
if (address.Length == 4)
{
Array.Reverse(buffer);
return((TValue)(object)BitConverter.ToInt32(buffer, 0));
}
throw new InvalidOperationException($"length must be 2 or 4 but is {address.Length}");
}
if (typeof(TValue) == typeof(long))
{
Array.Reverse(buffer);
return((TValue)(object)BitConverter.ToInt64(buffer, 0));
}
if (typeof(TValue) == typeof(ulong))
{
Array.Reverse(buffer);
return((TValue)(object)BitConverter.ToUInt64(buffer, 0));
}
if (typeof(TValue) == typeof(short))
{
return((TValue)(object)(short)((buffer[0] << 8) + buffer[1]));
}
if (typeof(TValue) == typeof(byte) || typeof(TValue) == typeof(char))
{
return((TValue)(object)buffer[0]);
}
if (typeof(TValue) == typeof(byte[]))
{
return((TValue)(object)buffer);
}
if (typeof(TValue) == typeof(double) || typeof(TValue) == typeof(float))
{
var d = BitConverter.ToSingle(buffer.Reverse().ToArray(), 0);
return((TValue)(object)d);
}
if (typeof(TValue) == typeof(string))
{
if (address.Type == DbType.String)
{
return((TValue)(object)Encoding.ASCII.GetString(buffer));
}
else
{
return((TValue)(object)Encoding.ASCII.GetString(buffer).Trim());
}
}
throw new InvalidOperationException(string.Format("type '{0}' not supported.", typeof(TValue)));
}