get line number

[wey97]

How can you get the line number in a multiline text box?

[jim mcnamara]

long TextBoxLine = SendMessage( hWnd, EM_LINEINDEX,  (-1),  0L);

TextboxLine has the current line (one with the caret)
hWnd is the hWnd of the textbox.

[wey97]

I think you need to use the EM_LINEFROMCHAR message to get the line number of the caret.

[jim mcnamara]

Not according to MSDN. This gets the active line

[wey97]

I believe you are incorrect.

from MSDN
The EM_LINEINDEX message retrieves the character index of the first character of a specified line in a multiline edit control.

wParam
Specifies the zero-based line number. A value of –1 specifies the current line number (the line that contains the caret).

------------------------------------------------------------------------------

The EM_LINEFROMCHAR message retrieves the index of the line that contains the specified character index in a multiline edit control.

wParam
Specifies the character index of the character contained in the line whose number is to be retrieved. If this parameter is –1, EM_LINEFROMCHAR retrieves either the line number of the current line (the line containing the caret) or, if there is a selection, the line number of the line containing the beginning of the selection.

[prog_tom]

what is that "OL" for?

[parksie]

It specifies that you specifically want a "long", not an "int" in the parameter. Almost irrelevant with C++ because it'll coerce the types anyway.

[wey97]

it's the same as (long)0
which is irrelevant as parksie said.