Lazarus and Excel formulas via OLE

Hi there,

I am trying to export data to Excel from a Lazarus application using OLE.
When I try to add a value in a cell it works, but as soon as I try to add a formula in a cell I receive an error message.

procedure TForm1.Button1Click(Sender: TObject);
var XLApp: OLEVariant;
    x, y: Byte;
    tmpValue: Variant;
  // bron:
  XLApp := CreateOleObject('Excel.Application');
    XLApp.Visible := true;
    XLApp.DisplayAlerts := False;
    XLApp.Workbooks.Add; // alternatief: XLApp.Workbooks.Open(filename);

    // Column headers...
    For x := 0 to Query1.FieldCount-1 do begin
      tmpValue := Query1.FieldDefs.Items[x].Name;
      XLApp.Cells[1, x+1] := tmpValue;

    tmpValue := '% actual/max';
    XLApp.Cells[1, x+2].Value := tmpValue;

    // Data...
    y := 2;
    while not Query1.Eof do begin
      for x := 0 to Query1.FieldCount-1 do begin
        tmpValue := Query1.Fields[x].Value;
        XLApp.Cells.Item[y, x+1].Value := tmpValue;

      tmpValue := 'IF(I2<>0;(100*J2)/I2;0)';
      XLApp.Cells[y, x+3].Value := tmpValue;


    // Formatting...
    XLApp.Range['A1:XFD1'].Font.Bold := true;

    XLAPP := Unassigned;

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The problem code is at line 30 and 31.

What is going wrong here? I'm working in a Windows environment.

Thank you for your help!

Kind Regards,
Stefan van RoosmalenfounderAsked:
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maybe try

      tmpValue := '=IF(I2<>0,(100*J2)/I2,0)';
      XLApp.Cells[y, x+3].Formula:= tmpValue;

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Stefan van RoosmalenfounderAuthor Commented:
This does not work unfortunately. Same error message.
Text of the error?
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Stefan van RoosmalenfounderAuthor Commented:
Error message:
"Project ExcelApp raised exception class 'EOleException' with message: ###(gdb unparsed remainder:s 0x0 out of bounds>)###"

A funny detail: when I change line 30 from
tmpValue := '=IF(I2<>0;(100*J2)/I2;0)';

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tmpValue := 'IF(I2<>0;(100*J2)/I2;0)';

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then I do not have an error but then I do not have calculations. The formula in that case is displayed as text.
pls change the semicolons in the formula to commas

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Stefan van RoosmalenfounderAuthor Commented:
Hey! That seems to be the trick! Wow...
Thank you very much you are making my day!
Not knowing Lazarus maybe if you use FormulaLocal you could use semicolons
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