Retrieves the character index of the first character of a specified line in EmEditor. A character index is the zero-based index of the character from the beginning of the edit control. You can send this message explicitly or by using the Editor_LineIndex inline function.
wParam = (WPARAM) (BOOL) bLogical;
lParam = (LPARAM) (int) yLine;
Specifies TRUE if the line number is by the logical coordinates. Specifies FALSE if the line number is by the display coordinates.
Specifies the zero-based line number. A value of -1 specifies the current line number (the line that contains the cursor).
The return value is the character index of the line specified in the yLine parameter.
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