XPLMGetMouseLocation

XPLMGetMouseLocation

XPLM_API void                 XPLMGetMouseLocation(
                                   int *                outX,    /* Can be NULL */
                                   int *                outY);    /* Can be NULL */

This routine returns the current mouse location in cockpit pixels. The bottom left corner of the display is 0,0. Pass NULL to not receive info about either parameter.