An application sends an EM_LINEINDEX message to retrieve the character index of a line in a multiline edit control. The character index is the number of characters from the beginning of the edit control to the specified line.
EM_LINEINDEX wParam = (WPARAM) line; // line number lParam = 0; // not used; must be zero
The return value is the character index of the line specified in the line parameter, or it is -1 if the specified line number is greater than the number of lines in the edit control.
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