private static void AssertToByteArrayAndBackEquals(string value, int reservedLength, params byte[] expected)
{
var convertedData = S7WString.ToByteArray(value, reservedLength);
CollectionAssert.AreEqual(expected, convertedData);
var convertedBack = S7WString.FromByteArray(convertedData);
Assert.AreEqual(value, convertedBack);
}
public static byte[] SerializeDataItem(DataItem dataItem)
{
if (dataItem.Value == null)
{
throw new Exception($"DataItem.Value is null, cannot serialize. StartAddr={dataItem.StartByteAdr} VarType={dataItem.VarType}");
}
if (dataItem.Value is string s)
{
return dataItem.VarType switch
{
VarType.S7String => S7String.ToByteArray(s, dataItem.Count),
VarType.S7WString => S7WString.ToByteArray(s, dataItem.Count),
_ => Types.String.ToByteArray(s, dataItem.Count)
}
}
;
return(SerializeValue(dataItem.Value));
}
/// <summary>
/// Given a S7 variable type (Bool, Word, DWord, etc.), it converts the bytes in the appropriate C# format.
/// </summary>
/// <param name="varType"></param>
/// <param name="bytes"></param>
/// <param name="varCount"></param>
/// <param name="bitAdr"></param>
/// <returns></returns>
private object?ParseBytes(VarType varType, byte[] bytes, int varCount, byte bitAdr = 0)
{
if (bytes == null || bytes.Length == 0)
{
return(null);
}
switch (varType)
{
case VarType.Byte:
if (varCount == 1)
{
return(bytes[0]);
}
else
{
return(bytes);
}
case VarType.Word:
if (varCount == 1)
{
return(Word.FromByteArray(bytes));
}
else
{
return(Word.ToArray(bytes));
}
case VarType.Int:
if (varCount == 1)
{
return(Int.FromByteArray(bytes));
}
else
{
return(Int.ToArray(bytes));
}
case VarType.DWord:
if (varCount == 1)
{
return(DWord.FromByteArray(bytes));
}
else
{
return(DWord.ToArray(bytes));
}
case VarType.DInt:
if (varCount == 1)
{
return(DInt.FromByteArray(bytes));
}
else
{
return(DInt.ToArray(bytes));
}
case VarType.Real:
if (varCount == 1)
{
return(Types.Real.FromByteArray(bytes));
}
else
{
return(Types.Real.ToArray(bytes));
}
case VarType.LReal:
if (varCount == 1)
{
return(Types.LReal.FromByteArray(bytes));
}
else
{
return(Types.LReal.ToArray(bytes));
}
case VarType.String:
return(Types.String.FromByteArray(bytes));
case VarType.S7String:
return(S7String.FromByteArray(bytes));
case VarType.S7WString:
return(S7WString.FromByteArray(bytes));
case VarType.Timer:
if (varCount == 1)
{
return(Timer.FromByteArray(bytes));
}
else
{
return(Timer.ToArray(bytes));
}
case VarType.Counter:
if (varCount == 1)
{
return(Counter.FromByteArray(bytes));
}
else
{
return(Counter.ToArray(bytes));
}
case VarType.Bit:
if (varCount == 1)
{
if (bitAdr > 7)
{
return(null);
}
else
{
return(Bit.FromByte(bytes[0], bitAdr));
}
}
else
{
return(Bit.ToBitArray(bytes, varCount));
}
case VarType.DateTime:
if (varCount == 1)
{
return(DateTime.FromByteArray(bytes));
}
else
{
return(DateTime.ToArray(bytes));
}
case VarType.DateTimeLong:
if (varCount == 1)
{
return(DateTimeLong.FromByteArray(bytes));
}
else
{
return(DateTimeLong.ToArray(bytes));
}
default:
return(null);
}
}
public void ReadMalformedStringSizeLargerThanCapacity()
{
Assert.ThrowsException <PlcException>(() => S7WString.FromByteArray(new byte[] { 0, 3, 0, 5, 0, 0x00, 0x41, 0x00, 0x41, 0x00, 0x41 }));
}
private static void AssertFromByteArrayEquals(string expected, params byte[] bytes)
{
var convertedString = S7WString.FromByteArray(bytes);
Assert.AreEqual(expected, convertedString);
}
public void WriteAbcWithStringLargerThanReservedLength()
{
Assert.ThrowsException <ArgumentException>(() => S7WString.ToByteArray("Abc", 2));
}