Dream Flyer

Dear Mr Dowson, Presently I'm writing a program relative to PMDG747 on FSX, one of the tasks is to read out Spd, Hdg & Alt values on the MCP. Unlike other add-on aircrafts, PMDG747 doesn't reserve an interface for data I/O for programmers, nor can SimConnect read the values. I've tried checking out the offsets in FSUIPC but failed to find the values in any of the offsets. I managed to find the values through some memory exploring apps, but obviously the address for storage will vary every time I load the aircraft. Now I've no idea getting the data in any specific method. Could you offer me some tips on how to access those values in my own application? My platform: FSX+Acceleration, PMDG744 2.1(probably), Win7 x64 TTTTThanks a lot, I'll appreciate your help!