Converts the serial position to the logical coordinates. The serial position is the zero-based index of the character from the beginning of the entire text. You can send this message explicitly or use the Editor_SerialToLogical inline function.
wParam = (WPARAM) (UINT) nSerial;
lParam = (LPARAM) (POINT_PTR*) pptLogical;
Specifies a serial position to be converted.
Pointer to a POINT_PTR structure that will receive the converted logical coordinates.
Return the serial potion.