I wrote Delphi debug visualizer for TDataSet to display values of current row, source + screenshot: http://delphi.netcode.cz/text/tdataset-debug-visualizer.aspx . Working good, but very slow. I did some optimalization (how to get fieldnames) but still for only 20 fields takes 10 seconds to show - very bad.
Main problem seems to be slow IOTAThread90.Evaluate used by main code shown below, this procedure cost most of time, line with ** about 80% time. FExpression is name of TDataset in code.
procedure TDataSetViewerFrame.mFillData;
var
iCount: Integer;
I: Integer;
// sw: TStopwatch;
s: string;
begin
// sw := TStopwatch.StartNew;
iCount := StrToIntDef(Evaluate(FExpression+'.Fields.Count'), 0);
for I := 0 to iCount - 1 do
begin
s:= s + Format('%s.Fields[%d].FieldName+'',''+', [FExpression, I]);
// FFields.Add(Evaluate(Format('%s.Fields[%d].FieldName', [FExpression, I])));
FValues.Add(Evaluate(Format('%s.Fields[%d].Value', [FExpression, I]))); //**
end;
if s<> '' then
Delete(s, length(s)-4, 5);
s := Evaluate(s);
s:= Copy(s, 2, Length(s) -2);
FFields.CommaText := s;
{ sw.Stop;
s := sw.Elapsed;
Application.MessageBox(Pchar(s), '');}
end;
Now I have no idea how to improve performance.
