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#23:How can I get a line/column number that a memo/richtext cursor is on?

If you want to retrieve the line and/or column number you must send a messages to control and retrieve the result:

For TRichEdit you must send a EM_EXLINEFROMCHAR and EM_LINEINDEX messages.
For TMemo you must send a EM_LINEFROMCHAR and EM_LINEINDEX messages.

The WParam contains the character number that you wish the line number for, or -1 for the current line (where the caret is located or the beginning of a text selection).

View examples:
- for TMemo
LineNumber := SendMessage(Memo1.Handle, EM_LINEFROMCHAR, -1, 0);

- for TRichEdit
LineNumber  := SendMessage(RichEdit1.Handle, EM_EXLINEFROMCHAR, 0, RichEdit1.SelStart);
ColNumber := (RichEdit1.SelStart - SendMessage(RichEdit1.Handle, EM_LINEINDEX, LineNumber, 0));

PS: not forget that starting values is 0.