AS2 Push
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So I was arguing a long time ago with one of the mods here how push works, and I kind of had to look it up to work on a new aob, so I figured I would finally write up how push works in AS2/AVM1(0?) if for no reason other than to have it written down in one easy to find spot.
lets just dive into a sample push push 65535 Code: [Select] 96 05 00 07 ff ff 00 00 0cSo, what does these numbers mean?96 =push 05 00 = 5 {00 05}(length of data, short) 07 = int {signed} (datatype) ff ff 00 00 = 65535 {00 00 ff ff} (data) pay special attention to that 07. It is a flag that tells flash that an integer object is being pushed onto the stack. there are 9 different object flags for push. Quote from: "Zirak" 00 - string Each of these flags has a set datalength except string which is null terminated, youll need to know these for the length part of the push instruction flag--# of bytes 00 -- strlen+1 01 -- 8 (?unsure here) 02 -- 0 03 -- 0 04 -- 1 05 -- 1 06 -- 8 07 -- 4 08 -- 1 [hr:kgotpf7h][/hr:kgotpf7h][hr:kgotpf7h][/hr:kgotpf7h] ok so lets see push in action c_pistol_score=so.data.c_pistol_score Code: [Select] //96 04 00 08 17 08 04thats no fun, i need 50 000 for the badge, lets make itc_pistol_score=50000;//50000==0x0000c350 Code: [Select] //96 07 00 08 17 07 50 c3 00 00painless. oh and here is string. its tricky, because the null termination is 00 not 02. so dont get snagged. Code: [Select] op -len- str_k _o _l _o _n _e _l _k _a _d _a _t null-terminationhappy hacking. I use this AoB tool to make all the AoBs I post. Try the online version if you dont feel like downloading it. |
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Hey nice tutorial, now AS2 can be made easier for Usaio (broken image removed)
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Great writeup. I've always used http://www.m2osw.com/swf_action_pushdata as reference on as2 push.
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jesus... I spent like an hour googling trying to find something like that.... found nothing....
I use this AoB tool to make all the AoBs I post. Try the online version if you dont feel like downloading it. |
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Quote from: "VxD" Hey nice tutorial, now AS2 can be made easier for Usaio (broken image removed)Hey! I can do AS2! The AoBs are just way too long and gross. I don't like it. The hell... |
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well since you guys are all pros at this maybe you can help me out with this mess i cant wrap my head around.
I dont remember what it was exactly, but it was basically this.finalscore = some long ass bullshit so i changed it to this. cutting out all that long ass bull shit and making the score 10 000. Code: [Select] _push "finalscore" 10000 "this"but it doesnt work... odd well maybe I got the stack wrong...I know it should be this but....Quote from: "thestack" "this"_getVariable => pop dx ?i guess i dunno, register doesnt really matter, pretty sure nothing is pushed onto the stack? _setMember => pop ax cx; mov ds:cx,ax ?again assumption? but anyways what ended up working was Code: [Select] _push "this"I dont inderstand... stack is the same as the last time.... karma to whoever points out my major malfunction. I use this AoB tool to make all the AoBs I post. Try the online version if you dont feel like downloading it. |
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Code: [Select] _push "this"Means "I want to access the 'this' variable."Code: [Select] _push "finalscore"Means I want to reference the finalscore variable INSIDE the 'this' variable.The rest should be obvious. setMember, as opposed to setVariable, sets a variable inside an object and calls it a member. As opposed to that, setVariable sets an "independent" variable. The same process goes with the getMember/getVariable. Now, the push function when pushing several things works in reverse. It's incredibly weird, but it makes sense. Let's take an example scenario: Code: [Select] _root.hello = _root.world;It'd look something like: Code: [Select] _push "_root"(broken image removed) Hopefully the image makes sense... |
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right. i still dont get why
Code: [Select] _push "finalscore" 10000 "this"doesnt work.I use this AoB tool to make all the AoBs I post. Try the online version if you dont feel like downloading it. |
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Quote from: "kolonelkadat" right. i still dont get why Let's see what you do here, from the interpreter's point of view. push finalscore push 1000 push this getVariable this setMember 1000 (broken image removed) What you want it to see is "I want to access the finalscore member of the this variable and push 1000 in it." To do that, you need to see that the interpreter needs to be specifically told what to access and where. |
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but why isnt finalscore accessible?
I use this AoB tool to make all the AoBs I post. Try the online version if you dont feel like downloading it. |
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It's accessible, you just didn't access it. You can access it by doing this:
_push "this" _getVariable _push "finalscore" _getMember Or, if you want to set it, _push "this" _getVariable _push "finalscore" //calculations here _setMember See what I did there? I first specifically told him to get the object "this", then to go to the member "finalscore". |
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That still doesn't explain why the given code doesn't work, Zirak, only why yours does. The real question is... if the stack contains just a reference to any member, why does "this" have to come first? What is it about the handling of the stack that makes this incorrect?
If we break the code into Code: [Select] _push "finalscore"we are still first telling the game to get "this", then store some information in the "finalscore" member, just relying on the stack to maintain the information.Unsubstantiated hypothesis that I just thought up... _getVariable pulls information off the stack, then adds more information on top. So, when the above code gets to the _setMember, the stack looks like: Quote from: "thestack" [unknown information]When the _setMember gets executed, the top of the stack should be the value, the second should be the member, and the third should be what the member is part of. Clearly we don't have this, so the _setMember op bugs. Thinking about it, the "unknown information" is likely a reference to the instance of the class we're using (a memory address). Mostly likely "finalscore" is treated as a constant offset for each instance of the class. So, we want Quote from: "Good Stack" valuebut the code KK used gives Quote from: "Bad Stack" instance addressBasically the arguments for the _setMember "function" are given in the wrong order. |
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I read tutorials whole day and i am trying to test what i learned so i have a test.swf with code below
Quote //96 02 00 08 24 So would u please someone let me know how can i find the aob code of the value that i want to add. In this code i want to add for example 10000 to this so as to add 10000 to "updateUserMoney".I am i wrong? the reference is "this" so first of all i have to try to act it. i tried several ways but doesnt work for example i try nto use the aob values that i see in this post Quote //96 07 00 08 17 and try this Quote
but again not works.Huh help will be appreciated.Ty |
