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Hi all,
I was wondering if anyone could help me with analyzing/reading other process’ memory space. I need to view the memory space in real-time, while running the application, to be able to segregate the variables storing the application state and various strings that are displayed in UI. Then, I need to be able to locate those variables automatically and read them in real-time, whenever application is running.
For example, take Windows Media Player. I would want to be able to get variables such as: string for song currently playing, state of the player (play/pause, volume, etc.), whenever the application is running in memory. Or, as another example, a list of users currently online on MSN and their status.
Are there any applications that would ease my task (e.g. to analyze memory space first)? What programming language could this be written in? (I assume it would be C/C++, and maybe C#?) How would I go about doing all this?
Thank you very much in advance.
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I don't think that this would be possible because how would you figure out where the string is stored?
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I know I am nekroing this thread, but considering the answer above I just had to:
Yes it is possible, although this is pretty advanced stuff imho and I can only point in the general direction, firstly because its early and I am tired and secondly because it is a very wide field. You will need to reverse engineer the specific target to find out where (at what addresses) it stores the information you need, then access the memory of the process from within your own application (ReadProcessMemory is your friend). Another way would be working with hooks. It is the same concept as writing trainers for games, there you need to find certain memory addresses too and change/freeze them, etc. So if you are still interested in the topic I would suggest reading up on writing trainers, reverse engineering software, API hooks, PE file format and the like. This should take a while :P
I really cant help much more, as what exactly you would need to do totally depends on the target application. Also most developers are not very fond of others reverse engineering their software. While it might not necessarily illegal to do so, many applications nowadays are packed or protected otherwise.
So yes, there are applications that "would ease your task". A debugger would help in actually aquiring the addresses of the data you want to aquire. Ollydbg is a nice and free debugger. You also might want to aquire a hex-editor. Use the programming language of your choice, as long as it supports the WinAPI.
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Hello everyone,
If a and b are both float (or double, I think it does not matter?), and I want to calculate a/b. I am wondering whether there will be any issues which make the calculation result in-accurate compared with the calculation result by-hand (on a paper). 
For example, if a is too big, or if b is too small? If such issue exists, what is the best practices to calculate a/b?
thanks in advance,
George
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Floats are not accurate. Decimals are better in terms of accuracy but also slower.
Cheers,
Vikram.
The hands that help are holier than the lips that pray.
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Depending on what is the result value and the precision that you want. Float has 7 while Double has 14 (IIRC) precision so it's generally more precise. But still depending on the value.
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Thanks darkelv,
Any tutorials on this topic?
regards,
George
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I've had float's giving some rather... Awkward answers when dealing with unnaturally large / small numbers.
Use double 
double a = 9249716388365591935;<br />
double b = 0.000000000000000000000000000000000001;<br />
double c = (a / b);<br />
MessageBox.Show(c.ToString());
Although, that's the limit of double - "a" cannot be any larger (An extra digit)...
Although, if you actually NEED any larger numbers.....
I'll try find something :p
- Reelix
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Thanks Reelix,
Let me know if you find any good tutorials.
regards,
George
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Thanks Reelix!
Good link!
regards,
George
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Moral of the Story:
double j;
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Decimal should be better than double in C#, I mean precise and range, right?
regards,
George
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Might...
Never used decimal, to be honest...
Which brings up one of the question:
Why so many data types? :p
Why have int when you have double and decimal?
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If you do not use double type, what types do you use?
regards,
George
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Hello everyone there.
My name is Sachin.
Can anyone tell me how to count the number of rows using C#.NET?
I'm using MS ACCESS as my database source.
I'll be waiting for your replies.
Thanks in Advance.
Regards
Sachin Hundekar
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Get row count from datagridview:
datagridview.rowcount
Get row count from dataset:
dataset.table[0].rows.count
hope this help you
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This is bad advice. Why do you want to retrieve all the rows to get just the row count of a table?
Cheers,
Vikram.
The hands that help are holier than the lips that pray.
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erm..my suggestion is accrodding on after retrive data from database.Sure i am agree that using SELECT statement is the best when user would like to get the row count in database.
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Am not familiar with Access, but surely SELECT COUNT(1) FROM tableName should do the trick? There should be plenty of samples on Google.
Cheers,
Vikram.
The hands that help are holier than the lips that pray.
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Hello Sachin,
If you are using a DataSet to connect it with Access table, you may use following syntax –
myDataSet.Tables[0].Rows.Count
If you do not know how to use DataAdapter, Connection object and DataSet I would recommend you to study Ado.Net first.
Just to give you some idea, basic code to connect to one data base file and getting its row count will look like this –
----------------------------------------------------
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
OleDbConnection con=new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\YourDatabaseFolder\\Nwind.mdb;Persist Security Info=False");
DataSet ds=new DataSet();
OleDbDataAdapter da;
private void Form1_Load(object sender, EventArgs e)
{
da= new OleDbDataAdapter("select * from customers",con);
da.Fill(ds);
}
private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show( ds.Tables[0].Rows.Count.ToString());
}
------------------------------------
I hope this helps.
-Ajay.
-------------------------
www.componentone.com
-------------------------
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Hello masters,
I have written a small project like this:
<br />
...<br />
try<br />
{<br />
img.Save("C:\\result.bmp");<br />
}<br />
finally<br />
{<br />
img.Dispose();<br />
}<br />
...<br />
Everything seemed good until I got a message box from Program.cs:
ArgumentException was unhandled. Parameter is not valid...
I can not find any mistake from my code, maybe something's wrong with my toolboxes' name?
Thanks for any help!
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where is img defined ? Perhaps a using block would be nicer ?
What's the stack trace, that will give you a better idea where it goes wrong ? Have you used reflektor to look at the .NET library source and see what causes this exception to be thrown ?
Christian Graus
Please read this if you don't understand the answer I've given you
"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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