Cheat Engine

[supercharger]

i am trying to change some value in a game which is several years old.
i found the value address and pointer , like " 00xxxxxx + offset xxx" , and each time the game is loaded, the address is correct. but writing to this address by CE is no use.

then i used "find out what writes to this address", only one command such as "FSTP xxxxxxxxxxxxx " appear.
above that line, it is command "call xxxxxxxx " . and follow the "call" command,i saw commands like "fmul" etc.
i back-traced the variables (EAX EDX etc) and at the end found some address like " ESP + xx "

if the line (like FSTP xxxxxxxxx) which writes to the address is removed, the game doesn't function correctly anymore. and ESP addresses are always changing.

what can i do with this kind of module?

in some other games, i can change values to whatever i want, but in this one, i can't.

[Dark Byte]

find the instruction before the fstp that changes the floating point value and change that. Leave the fstp there

That way the pop of the FP-stack still happens and no crash

[supercharger]

thanks for the reply, Dark Byte. but reading the instructions before the FSTP line is difficult for me. i'll keep on studying though.