Joined: 3/18/2006
Posts: 971
Location: Great Britain
I want to print the value at 0x80000048 everytime it is written to.
Anyone know how this can be done?
I only know that I'll have to use this function, but I'm unsure how to have it print only when the value is written. (so it doesn't print anything when the value isn't changing)
print(memory.readdword(0x80000048))
Thanks if anyone can help with this.
edit:
or an alternative way would be to print the value every 3 seconds!
adelikat: Moved this topic from OT to Labratory
Emulator Coder, Site Developer, Site Owner, Expert player
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Joined: 11/3/2004
Posts: 4754
Location: Tennessee
memory.registerread() is what you are looking for (assuming the emulator you are using has it implemented).
What this does is register a lua function that you write to the read event of a memory address.
so for example you would do a function like this:
function PrintValue()
print(memory.readdword(0x80000048))
end
memory.registerread(PrintValue)
Wouldn't memory.registerread need to know the address of the memory that you want to register to? That is, aren't you missing an argument to it?
I admit I haven't worked in lua in ages, but this seems somewhat underdefined otherwise.
Pyrel - an open-source rewrite of the Angband roguelike game in Python.
actually, you'll want registerwrite, and yeah, you'll want to say memory.registerwrite(address,(size,)function) where size is an optional argument that defines a range to watch, instead of a single address.
For your case, it looks like you'll want
memory.registerwrite(0x80000048,4,print(memory.readdword(0x80000048)))
How fleeting are all human passions compared with the massive continuity of ducks.
If your emulator doesn't have a registerwrite function, you can always just do this manually by reading the value at that address every frame and comparing it with the previous value, only printing the value when they differ. memory.registerwrite is almost definitely more efficient, if available, though.
That wouldn't help if he needs to know when the value is written to though. For instance, what if a game writes the value once when a button is pressed but never wipes it from memory, and the next frame the same button is pressed and the same number is written.
I don't think there is anyway to do this in lua, you'd probably need to set breakpoints if the emu has a debugger.
That wouldn't help if he needs to know when the value is written to though. For instance, what if a game writes the value once when a button is pressed but never wipes it from memory, and the next frame the same button is pressed and the same number is written.
I don't think there is anyway to do this in lua, you'd probably need to set breakpoints if the emu has a debugger.
If you only want to know when the value changes at a frame boundary, you can remember what the value from the previous frame was, compare, print if it differs and set it to the new value.
Joined: 3/18/2006
Posts: 971
Location: Great Britain
ok, so I think I've made this more complicated than necessary.
All I actually need is something that does print(memory.readdword(0x80000048)) every second (60 frames).
Anyone can help with this?
Joined: 4/17/2010
Posts: 11475
Location: Lake Chargoggagoggmanchauggagoggchaubunagungamaugg
I like that one better:
Language: lua
last_value = 0
function check()
value = memory.readbyte(0x80000048)
if value ~= last_value then print(value.." for frame "..movie.framecount()) end
last_value = value
end
emu.registerafter(check);
Warning: When making decisions, I try to collect as much data as possible before actually deciding. I try to abstract away and see the principles behind real world events and people's opinions. I try to generalize them and turn into something clear and reusable. I hate depending on unpredictable and having to make lottery guesses. Any problem can be solved by systems thinking and acting.
Joined: 3/18/2006
Posts: 971
Location: Great Britain
samurai goroh wrote:
I like using modulo best
local timer = 0
while true do
timer = (timer + 1) % 60
emu.frameadvance()
if timer == 0 then
print(memory.readdword(0x80000048))
end
end
This is what I need except can it be modified so that it bases 'seconds' on something else? Based on any type of clock, including the OS if necessary.
(emu.frameadvance() doesn't work properly in this emulator and just floods the lua dialog with values as fast as it can, and crashes.)
So, which emulator are we talking about?
If emu.frameadvance() isn't recognized (like that) then it won't run the WHILE statement once per frame. So, if you remove it, it will run indefinitely when you open the script & that's likely the reason it floods the dialog & crashes...
That wouldn't help if he needs to know when the value is written to though. For instance, what if a game writes the value once when a button is pressed but never wipes it from memory, and the next frame the same button is pressed and the same number is written.
I don't think there is anyway to do this in lua, you'd probably need to set breakpoints if the emu has a debugger.
If you only want to know when the value changes at a frame boundary, you can remember what the value from the previous frame was, compare, print if it differs and set it to the new value.
That was my point, what if an enemy spitting a fireball wrote a value of '5' to memory, but the game never resets it to '0' when it doesn't throw a fireball but it did the same thing on the following frame. Since you're looking for a change, there would be no way to tell the enemy did it twice in a row. It'd be nice to have some sort of feature that can detect when an address is written to similar to a 'break on write'.
Sorry if off topic a bit.
Joined: 3/18/2006
Posts: 971
Location: Great Britain
Dolphin emulator.
Hmm, that's too bad then.
samurai goroh wrote:
So, which emulator are we talking about?
If emu.frameadvance() isn't recognized (like that) then it won't run the WHILE statement once per frame. So, if you remove it, it will run indefinitely when you open the script & that's likely the reason it floods the dialog & crashes...
Joined: 3/18/2006
Posts: 971
Location: Great Britain
i managed to fix emu.frameadvance() function. so it now works!
However, I'm getting false positives.
Could I use memory.registerwrite to make sure I only get the value printed (or even better: written to txt file) when it changes?
I don't want to get the same value twice or more in a row.
I used this:
-- File to write to
local outfile = assert(io.open("value_mem.txt", "w"));
memory.registerwrite(0x00c7500f,outfile:(memory.readbyte(0x00c7500f)))
end
assert(outfile:close());
The colon: is for calling a function, not making a function. You probably want something more like this:
Language: lua
-- File to write to
local outfile = assert(io.open("value_mem.txt", "w"));
local function onMemoryWrite()
outfile:write(memory.readbyte(0x00c7500f) .. "\n")
end
memory.registerwrite(0x00c7500f,onMemoryWrite)
