流和Variant变量的转换

procedure TForm2.VariantToStream (const v : olevariant; 
                                  Stream : TMemoryStream); 
var 
  p : pointer; 
begin 
  Stream.Position := 0; 
  Stream.Size := VarArrayHighBound (v, 1) - VarArrayLowBound(v,  1) + 1; 
 p := VarArrayLock (v); 
  Stream.Write (p^, Stream.Size); 
  VarArrayUnlock (v); 
  Stream.Position := 0; 
end; 

procedure TForm2.StreamToVariant (Stream : TMemoryStream; var v : OleVariant); 
var 
  p : pointer; 
begin 
  v := VarArrayCreate ([0, Stream.Size - 1], varByte); 
  p := VarArrayLock (v); 
  Stream.Position := 0; 
  Stream.Read (p^, Stream.Size); 
  VarArrayUnlock (v); 
end;