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Get Memo current line

Use EM_LINEFROMCHAR message for Memo:


procedure TForm1.Memo1KeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
var
  LineNum: LongInt;
begin
  if (Key=VK_UP)or(Key=VK_DOWN) then
  begin
    LineNum:=Memo1.Perform(EM_LINEFROMCHAR, Memo1.SelStart, 0);
    Label1.Caption:='Line - '+IntToStr(LineNum+1);
  end;
end;

Related chapters: Fonts
Related topics: Scroll a Memo
Open ComboBox from other control
Setting ListBox font
For more: Win32 programmer's reference
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