1
00:00:01,410 --> 00:00:02,500
Welcome back.

2
00:00:02,520 --> 00:00:16,320
In the previous lesson we bash the message call unit barometers for the parent window to become f f

3
00:00:16,530 --> 00:00:26,230
f f f f 0 0 by using the N move 0 to hail a destruction.

4
00:00:26,300 --> 00:00:29,540
However that will produce some errors.

5
00:00:29,540 --> 00:00:32,330
Sometimes it works sometimes it doesn't.

6
00:00:33,020 --> 00:00:39,750
So if you put it wrongly sometimes it doesn't work.

7
00:00:39,770 --> 00:00:42,620
Now it feels so using.

8
00:00:42,640 --> 00:00:54,280
So our assembly to replace the recently e s registered 2 0 so this will set the entire base all to 0.

9
00:00:54,290 --> 00:00:59,950
Instead of just the first by so let's get started.

10
00:01:00,020 --> 00:01:01,890
Open the crazy one file.

11
00:01:02,000 --> 00:01:04,280
The X 64 DB e.g.

12
00:01:08,790 --> 00:01:13,540
click on run or press F nine to go to the entry point.

13
00:01:15,110 --> 00:01:17,480
Then search for string references

14
00:01:23,900 --> 00:01:31,060
and you can find the string reference for the wrong message box here.

15
00:01:32,440 --> 00:01:43,390
Double click to go to the address and this is a break point which we set earlier.

16
00:01:43,410 --> 00:01:50,510
Now here you can see the previous DV assemble these we know.

17
00:01:51,510 --> 00:02:05,500
And then we assemble the more l 0 0 2 one of the knobs and that produces some kind of um error rating.

18
00:02:06,070 --> 00:02:10,170
And in this lesson I'm going to show you another way.

19
00:02:10,280 --> 00:02:12,280
So here is supposed to jam.

20
00:02:12,440 --> 00:02:21,590
So we will not his first weekly hanging off a session.

21
00:02:21,800 --> 00:02:26,760
OK make sure this is checked closely.

22
00:02:27,310 --> 00:02:34,750
Now we have two knobs to replace the jump so he will not jump the next thing we want to do is to set

23
00:02:34,750 --> 00:02:35,990
DC s to 0.

24
00:02:36,010 --> 00:02:39,790
So that hole here down here.

25
00:02:40,480 --> 00:02:46,770
Then we push yes you push 0 instead of f f f f f and 0 0.

26
00:02:47,350 --> 00:02:52,780
So we want to assemble a new instruction which I will show you.

27
00:02:52,780 --> 00:02:53,650
It is called ISO.

28
00:02:53,770 --> 00:02:55,790
Ah yes yes.

29
00:02:56,500 --> 00:03:07,940
If you were to assemble here XO are ESEA and click on d to check how much site he takes.

30
00:03:07,990 --> 00:03:13,130
He seems it is bigger by one by.

31
00:03:14,200 --> 00:03:15,490
So you should be fine.

32
00:03:16,510 --> 00:03:22,840
So if we were to assemble this now it will take to buy.

33
00:03:23,200 --> 00:03:24,570
So we have to base here.

34
00:03:24,590 --> 00:03:26,690
Sure it should be just fine.

35
00:03:27,280 --> 00:03:35,560
By taking this we tell the assembler that we only won one by because we want to keep site but it is

36
00:03:35,800 --> 00:03:39,250
comparing say that instruction is bigger by one.

37
00:03:40,360 --> 00:03:47,500
So it is telling us that this some assembly will take up to base the one by which we have here plus

38
00:03:47,560 --> 00:03:48,190
another.

39
00:03:48,820 --> 00:03:49,750
So that is fine.

40
00:03:49,810 --> 00:03:50,980
So that is what we need.

41
00:03:51,020 --> 00:03:54,660
We have to base here so is sufficient.

42
00:03:54,730 --> 00:04:00,960
So I take this in assembler and it takes up 2 bytes.

43
00:04:00,990 --> 00:04:05,400
So now we have already know and replace.

44
00:04:05,430 --> 00:04:12,890
He s had is in time instead of no we replace one instruction to kill two birds.

45
00:04:12,990 --> 00:04:16,020
That means this as I say replaces the time.

46
00:04:16,170 --> 00:04:18,900
So there's no more jam at the same time.

47
00:04:19,230 --> 00:04:21,300
It sets e to zero.

48
00:04:21,870 --> 00:04:30,470
So that whenever you want to set something zero in this do an SLR followed by the reduced earning twice

49
00:04:31,060 --> 00:04:32,740
that we say it to zero.

50
00:04:33,810 --> 00:04:39,600
So now that is uh Randy saying give you the check.

51
00:04:39,650 --> 00:04:41,390
So you enter anything.

52
00:04:41,620 --> 00:04:42,420
Right.

53
00:04:42,710 --> 00:04:45,010
OK so it is here now.

54
00:04:45,010 --> 00:04:57,110
Break Point and we'll take a run and you can see down here the uh well is already shown now we can bet

55
00:04:57,120 --> 00:05:00,630
it so far fetch far.

56
00:05:01,780 --> 00:05:10,090
Click on the button push far and this time we're going to call it best to add a bank.

57
00:05:10,270 --> 00:05:11,780
So keep safe.

58
00:05:12,740 --> 00:05:17,390
OK hang close these and stop this as well.

59
00:05:17,530 --> 00:05:20,000
So now we can go and test now attached to

60
00:05:25,180 --> 00:05:26,610
and do anything.

61
00:05:26,980 --> 00:05:33,130
Check he looks and something else.

62
00:05:33,180 --> 00:05:36,930
Check he looks into another thing.

63
00:05:36,960 --> 00:05:38,620
Check it looks.

64
00:05:38,760 --> 00:05:43,760
So he works for every argument his hand still works too.

65
00:05:43,980 --> 00:05:47,850
Let's trace it and see what happens in the debugger.

66
00:05:48,540 --> 00:05:51,410
So we'll open page two and follow along.

67
00:05:53,160 --> 00:05:57,470
So now the right press F nine.

68
00:05:57,540 --> 00:06:05,420
Click on to run to the entry point and then search for string.

69
00:06:05,610 --> 00:06:13,530
You know Francis and then over here you see the message here.

70
00:06:13,530 --> 00:06:20,700
So just go to that address and then screw up and look for our new assembly.

71
00:06:20,700 --> 00:06:22,610
This is Ellen.

72
00:06:22,680 --> 00:06:27,650
Now we want to trace the tank so yes put a brake find us and move it.

73
00:06:28,140 --> 00:06:32,670
So over here this is where the first perimeter is pushed.

74
00:06:32,680 --> 00:06:35,910
No message in this message box to take for parameter.

75
00:06:36,630 --> 00:06:46,990
As you recall it is called barometers one two three one two three four barometers.

76
00:06:47,010 --> 00:06:47,590
All right.

77
00:06:47,640 --> 00:06:50,240
Now our differences we assembling this Steve

78
00:06:52,980 --> 00:06:53,590
for Vice.

79
00:06:55,800 --> 00:07:01,420
So how does zero say be set to movie clip to zero.

80
00:07:01,470 --> 00:07:06,710
So first perimeter is this which he is on here.

81
00:07:07,070 --> 00:07:17,960
Then second part perimeter push is here so this will be here then in this one will be this haste is

82
00:07:18,290 --> 00:07:22,790
the final one with this we should be zero by the time we reached that line.

83
00:07:23,110 --> 00:07:24,860
So let's give it a try try.

84
00:07:26,530 --> 00:07:27,500
So we run this

85
00:07:32,350 --> 00:07:33,160
keen.

86
00:07:33,300 --> 00:07:36,040
Anything click on the button.

87
00:07:36,100 --> 00:07:39,430
Check any pauses and our breakpoint.

88
00:07:39,510 --> 00:07:42,920
So now is ready to push 0 to the stack press F it

89
00:07:45,930 --> 00:07:56,660
and you push 0 to the say press at it again press F it and you supposed to set the X to zero presently.

90
00:07:56,710 --> 00:08:00,840
E axes f f f f f f f f.

91
00:08:00,850 --> 00:08:10,340
So now you press effort to execute this discussion and notice he says everything is zero privacy when

92
00:08:10,360 --> 00:08:17,860
we used to move instruction move is zero.

93
00:08:17,980 --> 00:08:20,220
You produce this

94
00:08:30,240 --> 00:08:34,220
he will produce this not a better way.

95
00:08:34,220 --> 00:08:43,040
Now I've shown you is to do this when you do this and he says here he is to zero which means he will

96
00:08:43,040 --> 00:08:48,160
get one two three four.

97
00:08:48,830 --> 00:08:49,060
Right.

98
00:08:49,220 --> 00:08:50,930
So it is better privacy.

99
00:08:50,930 --> 00:08:55,720
This feel sometimes because if only the first byte was set to zero.

100
00:08:55,720 --> 00:08:56,220
Okay fine.

101
00:08:56,330 --> 00:09:07,220
So now we are going to push the next insertion push on a string to stack so effort in the Congress he's

102
00:09:07,220 --> 00:09:08,060
pushed it aside.

103
00:09:08,240 --> 00:09:11,560
Congress is a caption no press f it again.

104
00:09:11,840 --> 00:09:12,630
And well done.

105
00:09:12,630 --> 00:09:14,070
String is here to stay.

106
00:09:14,340 --> 00:09:17,330
And now we're going to push you X which is zero.

107
00:09:17,330 --> 00:09:19,730
It is a correct buffet.

108
00:09:20,030 --> 00:09:24,380
So now we have to stay properly pushed.

109
00:09:24,500 --> 00:09:29,450
We have zero in the string exception.

110
00:09:29,510 --> 00:09:30,490
Zero.

111
00:09:30,520 --> 00:09:39,690
This is why we won we zero the caption on the string and the the parent being the lady.

112
00:09:39,930 --> 00:09:40,510
So that's it.

113
00:09:41,100 --> 00:09:51,720
So now we call the function press edit and you can see the message box issue.

114
00:09:52,650 --> 00:09:56,270
So he's working so that's it.

115
00:09:56,410 --> 00:10:05,160
The future if you wanted to bash something register to set it 0.

116
00:10:05,180 --> 00:10:11,660
A good way will be to use hey so ah yes yes that's all for us we.

117
00:10:11,690 --> 00:10:13,190
Thank you for watching.