Question About System.IO.FileInfo

[PGilbert]

If I do the following:

      fi←⎕NEW System.IO.FileInfo(⊂'c:\windows\explorer.exe')

      fi.Length ⍝ Size of the file
2870272

      1+fi.Length ⍝ Does not work because...
DOMAIN ERROR
      1+fi.Length
     ∧

      fi.Length.GetType ⍝ ...Length is an object System.Int64
System.Int64

My question is: What is the best way to convert this System.Int64 to an APL number ?

The following are working:

      1+⍎⍕fi.Length
2870273

      1+⍎fi.Length.ToString ⍬
2870273

      1+System.Int32.Parse (⊂fi.Length.ToString ⍬)
2870273

but don't look very efficient.

Thanks,

Pierre Gilbert

Using: v12.1 - Unicode

[Morten|Dyalog]

John Daintree, who is the chief architect of the "Dyalog .Net Bridge", is returning from vacation on Tuesday. I'll ask him why we don't just cast Int64 values (so long as the conversion does not lose precision). I can't immediately think of a good reason, but there may be one that I'm not aware of. Hopefully, you won't have to use a work-around very long.

I think my preferred workaround would be (Convert.ToDouble fi.Length). Convert.ToInt32 would be OK if you donn't have *big* files :-).

As previously mentioned, we *will* cast Int64 to the new 128-bit Decimal type in v13.0.

[stignielsen]

I have made a function to do various conversions of .Net types that will cast it to best suitable APL type. Maybe that can be used for inspiration?

Code: Select all

 r←dotnetConvNum dotnetnum;
⍝ Convert dotnet numeric value to the best corresponding representation in APL.

 :Select dotnetnum.GetType
 :Case System.Int64
    :If ¯1=dotnetnum.CompareTo System.Convert.ToInt64 System.Int32.MaxValue
       r←System.Convert.ToInt32 dotnetnum
    :Else
       r←System.Convert.ToDouble dotnetnum
    :EndIf
 :Else
    r←⍬
 :EndSelect