what is the best way to parse a textfile or from Tmemo

[mathsbertil]

Hi!
What is the best way to parse fields (for example) 2,3,4,5 for showing a candle chart.

The lines are originally in a Tmemo

Thanks for helping!

[mathsbertil]

1685311200, 4239,75, 4243,25, 4231,5, 4235,5, 4236,75, 6617, 2197
1685311500, 4235,75, 4237,5, 4232, 4233,25, 4234,6, 2521, 890
1685311800, 4233,25, 4234,5, 4231,5, 4232, 4233,3, 1517, 526
1685312100, 4232, 4233, 4230,25, 4232, 4231,5, 1568, 566
1685312400, 4232, 4235, 4231,5, 4233,5, 4233,525, 1154, 448
1685312700, 4233,75, 4234, 4232,25, 4233,5, 4233,1, 708, 294
1685313000, 4233,5, 4234,5, 4231,75, 4232, 4233,25, 808, 319

[mathsbertil]

SeriesTextSource?

[mathsbertil]

Import from memo.strings?

when using seriestext Tosource .. limitied to 2 fields"

When using TdbChart.. data is correct in text in Teechart but not in tdbchart.. see attached jpg

thanks ahead..

[mathsbertil]

I dont give input for name and data... only for pricefields

[mathsbertil]

Index Close High Low Open
0 0 0 0 0
1 0 4232 0 0
2 4232 0 0 0
3 4232 0 4233 4232
4 0 0 4235 4232
5 0 0 4234 0
6 4232 0 0 0
7 0 0 0 4232
8 4231 0 0 0
9 0 0 4231 4231
10 0 4

[Yeray]

Hello,

A couple of considerations:
- Those strings use the same character (comma ,) both as DecimalSeparator and as FieldSeparator. You need to change one of them to be able to correctly identify values and fields.
I chose to modify the values from comma , to dot .:

Code: Select all

1685311200, 4239.75, 4243.25, 4231.5, 4235.5, 4236.75, 6617, 2197
1685311500, 4235.75, 4237.5, 4232, 4233.25, 4234.6, 2521, 890
1685311800, 4233.25, 4234.5, 4231.5, 4232, 4233.3, 1517, 526
1685312100, 4232, 4233, 4230.25, 4232, 4231.5, 1568, 566
1685312400, 4232, 4235, 4231.5, 4233.5, 4233.525, 1154, 448
1685312700, 4233.75, 4234, 4232.25, 4233.5, 4233.1, 708, 294
1685313000, 4233.5, 4234.5, 4231.75, 4232, 4233.25, 808, 319

- Those date values look strange. If I take one of them and I convert it to date I get 28605 as year:

Code: Select all

  ShowMessage(DateTimeToStr(StrToFloat('1685311200'))); // -> 04/05/28605

After correcting those issues, you should be able to do something like this:

Project3_2023-06-01_09-27-29.png (16.34 KiB) Viewed 27808 times

Code: Select all

var Series1: TCandleSeries;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.View3D:=False;
  Chart1.Color:=clWhite;
  Chart1.Gradient.Visible:=False;
  Chart1.Walls.Back.Color:=clWhite;
  Chart1.Walls.Back.Gradient.Visible:=False;

  Memo1.WordWrap:=False;
  
  FormatSettings.DecimalSeparator:='.';

  Series1:=TCandleSeries(Chart1.AddSeries(TCandleSeries));
  with Series1 do
  begin
    DownCloseColor:=1330417;
    UpCloseColor:=6519581;
  end;

  With SeriesTextSource1 do
  begin
    Series:=Series1;

    HeaderLines:=0;
    FieldSeparator:=',';
    Fields.Clear;
    AddField('Date',1).OnGetValue:=DateGetValue;
    AddField('High',2);
    AddField('Low',3);
    AddField('Open',4);
    AddField('Close',5);

    LoadFromStrings(Memo1.Lines);
  end;
end;

procedure TForm1.DateGetValue(Field:TSeriesTextField; const Text:string; var Value:Double);
begin
  //Value:=StrToFloat(Text);  // -> Correct Date from text
  Value:=IncDay(Today, Series1.Count);  // I'm using this as alternative to the above
  Series1.NotMandatoryValueList.TempValue:=Value;
end;