S7-300 vb.net DINT negative conversion

Hi @djp4nd4,

Documentation for C# says: Read S7 Dint, you need to use ConvertToInt(): int result2 = ((uint)plc.Read("DB1.DBD60")).ConvertToInt();

This should work, even though the implementation of the method isn't great (and that's an understatement).

In vb.net if I use: quota = Convert.ToInt32(plc.Read("DB32.DBD6")) i receive error "Value was either too large or too small for an Int32"

Wait, you read the documentation which tells you to use ConvertToInt(), which is an extension method in S7NetPlus, but instead you're using Convert.ToInt32(), which is a method from .NET Framework itself?

If I use convert.ToInt64 i receive error "arithmetic overflow" quota = Convert.ToInt64(plc.Read("DB32.DBD6"))

I can hardly imagine that, given the number from the last example.

If I not use any conversion i receive quota = plc.Read("DB32.DBD6") i receive "quota= 4294967196"

Tried the following in C# interactive:

> uint x = 4294967196;
> Convert.ToInt32(x)
System.OverflowException: Value was either too large or too small for an Int32.
  + System.Convert.ToInt32(uint)
> Convert.ToInt64(x)
4294967196
> (int)x
-100

Long story short, you want to use quota = (int) plc.Read("DB32.DBD6"). Also, please take note that this is not a S7NetPlus issue (although the right type could've been returned from the Read method in the first place of course), this boils down to the lack of some basic C# skills. Please familiarize yourself with the C# language to avoid opening issues that are not related to S7NetPlus.

S7NetPlus / s7netplus

S7-300 vb.net DINT negative conversion #366