arrays-VCL-dotnet

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1 total messages Started by Reinhard Hagen Sat, 21 Jun 2008 07:07

#61

Author: Reinhard Hagen
Date: Sat, 21 Jun 2008 07:07

37 lines
1564 bytes

Hello all,

in my VCL.NET application (BDS2006) I have this code and types:

type
  CMatrix = array[,] of TComplex;  // case a)
  //TCMatrix = array of array of TComplex; // case b)

procedure MultCMatrix(const m1,m2: TCmatrix; var m3: TCmatrix);
begin
....
end;

Case a)
  Ma:=new(array[4,4] of TComplex);
  Mb:=new(array[4,4] of TComplex);
  Mc:=new(array[4,4] of TComplex);

 // then setting Ma,Mb,Mc...
// Calling

 MultCMatrix(ma,mb,mc);

causes the error:
'Object reference was not set to an instance of an object.

Case b)
  SetLength(Ma,4,4);
  SetLength(Mb,4,4);
  SetLength(Mc,4,4);

This works!

Why this difference?

Regards+Thanks
Reinhard

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