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Hi,
I would like to implement some form of simple checking, if the code of my program was tampered or not. The solution seems to be easy. Just calculate hash of the exe file and that's it. The problem is that I am unable to open the exe file, from which the program was launched. I have tried a C# file stream, but I got an exception. I also tried creatfile and readfile, but it does not work either. Does anyone has an idea, why I cannot open the program file for reading?
Thanks a lot for any help,
Tomas Pevny
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Hi,
the .NET FrameWork has provisions for this; look for "strong naming" and "signing" an
assembly. When applied, Windows will perform the check for you, and refuse to even launch
your app if it has been tampered with. (If you try to protect it yourself, the tampering
may have circumvented your check anyway).
Remark: IIRC it will require all referenced DLLs to also be strongnamed/signed, which
is OK for .NET itself, but may pose a problem with third-party stuff.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
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The problem is that strong names can be easily overstepped. I think there was an article about this on codeproject. Moreover, I would like to know, why I cannot open the exe file for reading?
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Hi,
1. as I already said, one can tamper with your checking code too.
2. I am not convinced you can't read a loaded EXE file; I would try with both the right
access mode (=what you want to be allowed to=READ) and the right share mode (=what you
want others to be able to do=probably also READ).
public static FileStream Open (
string path,
FileMode mode,
FileAccess access,
FileShare share
)
I doubt Windows loads with Share.None prohibiting anyone else from reading.
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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You are right. It works right now.
Thanks a lot,
Tomas Pevny
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Hi!
I have and HashTable object in my class, i initialize it with new as the class creates.
I am trying to use the ContainsKey in a function and i get this error:
Object reference not set to an instance of an object. at VAControls.clsScheduler.TaskHandle(SchedulerTask[]& taskarray, Int32& counter) in C:\Documents and Settings\Yossi_Tubis\My Documents\Visual Studio 2005\Projects\VASchedular\VASchedular\clsScheduler.cs:line 350
at VAControls.clsScheduler.main_scheduler() in C:\Documents and Settings\Yossi_Tubis\My Documents\Visual Studio 2005\Projects\VASchedular\VASchedular\clsScheduler.cs:line 312
I initialize it, so i do not understand why i get this message.
Do you know??
Thanks
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Hard to say without seeing the code. Have you used a debugger to see if the hashtable is what's null ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Yes I did!
it show that it is not null and that the count is 0;
This is the code:
if (m_eventhashtable.ContainsKey(taskarray[counter].SchedularAction))
{
if (CheckIfTaskMultiTime(taskarray[counter].SchedularAction))
{
//If i contain this Task but it is multiple, then add it to the list of event with number to process.
m_eventhashtable.Add(taskarray[counter].SchedularAction + duptaskcounter.ToString(), taskarray[counter]);
}
else
{
//if i contain this Task but it is not multiple, then change replace this one for the old one.
m_eventhashtable.Remove(taskarray[counter].SchedularAction);
m_eventhashtable.Add(taskarray[counter].SchedularAction, taskarray[counter]);
}
}
else
{
//If i do not contain this Task yet add it to the list of event to process.
m_eventhashtable.Add(taskarray[counter].SchedularAction , taskarray[counter]);
}
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ytubis wrote: if (m_eventhashtable.ContainsKey(taskarray[counter].SchedularAction))
is taskarray[counter] null ?
Christian Graus - Microsoft MVP - C++
"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )
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Here I am in a situation where three events should occur one after another provided that the
preceding event occured successfully.
For eg. When i click a button, the first event prints the first report and when the first
printing succeds ,it should print the second report.But sometimes, the first report printing
cannot be done because some printing error may occur.In that case,the program should stop there.
How can it be done?? I need a general idea only.
Could you guys help me out??
X
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It seems to me that you need to fire an event from the first print to state that it's finished and the second print will be triggered by this.
Deja View - the feeling that you've seen this post before.
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Dear Pete O'Hanlon,
Yes, this could be done but my case is little bit different.
Is there any way the second event can know that the first event has occured successfully??
X
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Also, does anyone know some GOOD articles on Xinput that I could see? (I'll accept DirectInput, too. And DirectSound.) Thanks.
-- modified at 15:57 Sunday 11th November, 2007
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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These[^] articles are quite decent.
Deja View - the feeling that you've seen this post before.
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Also, I see about devices, but it gives me an error. If you know some DirectX, could you tell me? Do I need to make an Enum?
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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Sure, but are they any GOOD?
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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I keep seeing (or something close to it...):
public void InitalizeDevice()<br />
{<br />
keyb = new Device(SystemGuid.KeyBoard);<br />
^ gives me error<br />
}
keyb or whatever you want to call it is what Im asking about
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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Download the source code from the site. It is available, but keyb is a member variable of type Device.
Deja View - the feeling that you've seen this post before.
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 Yup - as well as being fully clothed, they are actually quite instructive.
Deja View - the feeling that you've seen this post before.
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Since we all know (well, most of you) that I'm trying to construct a game, there's a couple more things I would like to know.
A) How do I use more than one key at a time. I have a player moving, and then jumping, but then he stops moving to the side once you press the jump button. This code looks somewhat like below.
protected override ProcessCmdKey(stuff)<br />
{<br />
switch (keydata)<br />
{<br />
case Keys.Space: <br />
Jump();<br />
case Keys.Right:<br />
Move_Right();<br />
}<br />
}
B) How to rotate Recangle rect. Say rect is hooked up to a timer though.
Also, if anyone could provide some articles on game physics, I'd like that. Or just to explain it a little. No code necessary, but I just want to have an idea on it. My thought was that developers set up points with algorithms to have a point stay to a certain part of, say a cube, and assign weight and rotation so it just goes by the points. Confusig, duh. That's why I want to know. Thaks SO MUCH in advance.
P.S. I should be just about done with stupid questions!
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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Hi,
1.
my app gets KeyPress events for every (printable) key I press, even when another
printable key is down at the same time, so the sequence "Adown,Sdown,Sup,Aup" generates
both the A and the S KeyPress event.
Two ideas though:
- it may depend on the actual keyboard firmware; long time ago I had a KB that only
could handle a single key action at a time (i.e. one key down blocked everything else,
except of course for the modifier keys)
- "printable" keys tend to autorepeat (i.e. generate extra Down and Press events when you
keep them down), maybe that is confusing you.
2.
you can translate, rotate, scale anything you like WHILE painting it, by using the
appropriate Graphics methods in OnPaint, such as Graphics.RotateTransform()
and the general Graphics.Transform().
Warning: these transforms are cumulative, they modify everything that follows.
3.
MasterSharp wrote: I should be just about done with stupid questions!
I trust you will discover more. 
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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How does RotateTransform work? I put in a float and it appears nothing happened.
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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Oh, I got it. But another question. How do you set up a switch for variables?
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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MasterSharp wrote: How do you set up a switch for variables?
 please clarify what it is you are curious about
Luc Pattyn [Forum Guidelines] [My Articles]
this months tips:
- use PRE tags to preserve formatting when showing multi-line code snippets
- before you ask a question here, search CodeProject, then Google
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switch (what goes here)<br />
{<br />
case x = 1:<br />
blah<br />
break;<br />
<br />
case x = 2:<br />
blah <br />
break;<br />
}
Also with bools and other numerical types, chars. Thanks.
- "Achieving all knowledge does not mean achieving all wisdom."
- "What makes you smart
?"
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