Cheat Engine

[Astaroth4256]

RPM will not read anything if it hits an inaccessible memory region. Recently I upgraded my code from reading 4 by 4 into reading memory chunks for increased speed, but now SOMETIMES it can't read anything (gives 0 bytes read). Such cases happen for example when reading an object's structure, most objects have ~4096 structure size (no errors reading that much) but rarely there's an object with address like 1C52CBB8 and it's size is ~400 bytes (due to it's different type but like every object it shares the same basics) - that's where RPM fails and the object is invisible to the application. GetLastError gives "only a part of request was completed" but I don't even get the part that could be read. So my question is, is it possible to somehow just get whatever part of memory is readable, or do I have to write separate code for each type of object that there's to read due to their difference in sizes? (I'd really rather avoid that)

[atom0s]

Some things to check:
- Make sure you have proper access to the process from the handle you opened.
- Make sure the memory page has valid access to be read from. (If not, use VirtualProtectEx to adjust it as needed.)
- Make sure you are using valid memory types for your address and not over/underflowing the variable holding the desired address to read. (ie. if you are targeting a 64bit process/address.)

And no, you don't need to write custom handlers for each object unless you want to. ReadProcessMemory already contains a mechanism to deal with partial reads which you can use to loop the call and complete a read as needed based on a given return and read size.

Your issue is more than likely due to one of the above issues or something similar if it's giving you this error and not reading/returning anything read at all.

[Astaroth4256]

[atom0s]

Use VirtualQueryEx to pull the page information, align to the page your address falls inside of that is valid/readable.

[Dark Byte]

if RPM fail with 0 bytes read change the size to:

[Astaroth4256]

Thank you kind sirs.