How to get the Character by Point or by index from TRichedit

I have function that returns the index of a character GetCharFromPos(Pt: TPoint): Int开发者_C百科eger;

now i wanted to get character of that position. like GetCharByIndex(Index: Integer): Char;

The efficient way to do this using pure VCL is to use SelStart, SelLength and SelText.

function GetCharByIndex(Index: Integer): Char;
begin    
  RichEdit.SelStart := Index;
  RichEdit.SelLength := 1;
  Result := RichEdit.SelText[1];
end;

You'll likely want to save away the selection before modifying it, and then restore it once you have read the character.

This is however a rather messy way to read a character. If you are prepared to use raw Win32 API then you can make use of EM_GETTEXTRANGE.

Here is how you return the character at a given index from a TRichEdit:

Result := RichEdit1.Text[Index];