Gets the position (top-left corner) of a given character within this CRichEditCtrl object.
Zero-based index of the character.
The character is specified by giving its zero-based index value. If lChar is greater than the index of the last character in this CRichEditCtrl object, the return value specifies the coordinates of the character position just past the last character in this CRichEditCtrl object.
For more information, see EM_POSFROMCHAR in the Platform SDK.