Below is a function w/ a working example showing how to access the AIDA64 shared memory.
First enable shared memory here: Preferences > Hardware Monitoring > External Applications > Enable Shared Memory
The length of the data depends on the number of active sensors and their content. As AIDA64 does not provide a buffer size value, we use _WinAPI_GetSystemInfo() <WinAPISys.au3> to get dwPageSize ($aArray[1]). This value is the used as an address offset, and we continue re