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how secure is the key container?
are there a better solution?
any artickle on the matter will be great help
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The standard 'key container' is a folder under your user profile, under Application Data\Microsoft\Crypto\RSA. Each file represents an issued key. The file itself is encrypted with your master key, which is itself protected by a key derived from your logon password.
The folder is protected by an Access Control List which permits only Administrators, yourself, and the system (represented by the LocalSystem or SYSTEM security principal) to read and write to the folder.
So the ultimate security of the key container is based on the strength of your logon password.
DoEvents: Generating unexpected recursion since 1991
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I am using a datastructure that represents a triangle mesh. It contains a list of 3D-vertices, a list of triangles (indices of the vertices used for the triangle), a list of edges (also indices) and some additional data. Each triangle has a 3D-vertex attached to it (the normal vector), so does each vertex. The angles and the area are also stored with every triangle. And every vertex stores the principal curvatures and their directions (as 3D-vertices). Every vertex stores a list of adjacent triangles and a list of neighboring vertices (also as indices).
All of that is not a problem for serialization. But I also need to store the distances from every vertex to every other vertex (to calculate the curvatures). I do this by storing the distance from one vertex to every vertex preceding it in the list of vertices with that vertex, so there is no redundance. (I tried a single array for all the distances, but it was too much and I got an OutOfMemoryException.)
My sample mesh contains 11703 vertices, 23402 triangles and 35103 edges, but the program should be capable of handling meshes a lot larger. I originally used doubles, as most of the "Math" methods return doubles. But I switched to float to save memory.
Now the program uses about 500MB of my 2GB of memory.
The distances are still too much for the serialization. (I tried storing just the distances using a StreamWriter and WriteLine and got a txt-file larger than 1GB, which is way too large.)
Serialization always throws an OutOfMemoryException. (I used binary serialization and GZip-Compression.)
Does anyone know a way of serializing such large datastructures?
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i'm trying to set focus on selected item but the way i'm using isn't working completely.
i wrote :
listView1.Items[a].Selected = true;
then that item on a(th) index gets selected but everytime i need to scroll down/up to search that item,
how can i set focus on that item?
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87??6?N8?BcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-i?TV.C\y<p?jxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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Try this:
listView1.EnsureVisible(a);
He who makes a beast out of himself gets rid of the pain of being a man
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yeah, it works, thanks
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87??6?N8?BcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-i?TV.C\y<p?jxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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The process cannot access the file 'D:\MyDataBase\69.jpg' because it is being used by another process.
if (PicName != null)
{
if (File.Exists(DBPicPath))
{
sr.Close();
if (File.GetAttributes(DBPicPath) == FileAttributes.Hidden)
//if (File.GetAttributes(DBPicPath) == FileAttributes.ReadOnly)
File.SetAttributes(DBPicPath, FileAttributes.Normal);
File.Delete(DBPicPath);
//File.Replace(DBPicPath, completePath);
}
File.Copy(PicName, completePath);
}
plzzz help me how to delete this file
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Neetu Maheshwari wrote: plzzz
"plzzz" is irritating. The word is "Please". Please use it.
Neetu Maheshwari wrote: help me how to delete this file
If another process has a handle on the file then you cannot delete it because it is in use. It is as simple as that. The operating system is protecting one process from interference by another process.
If you want to delete the file you must get the other process to release the file.
This error can also happen when another part of your program opens a file and does not close it properly.
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but file is not opened...when i debug step-by-step..it deletes the file..but not deletes the file by direct running the program....please help me
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So it seems that there is some time needed until the handle is actually released after you call Close on the stream.
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so what can be the solution for this.....give me the solution....please
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There is probably a better method by checking if the file is available but it's not something I've done so I'm not sure.
A quick solution maybe to insert a System.Threading.Thread.Sleep(i); where i = the number of miliseconds delay you need to put in for the file to be released.
Dave
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you should use a timer, that will be enabled by your code, then in timer_tick event, first disable the timer then delete that file
i sure this will work
TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87??6?N8?BcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKSQXUFYK[M`UKs*$GwU#(QDXBER@CBN%
Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-i?TV.C\y<p?jxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can
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Hi,
if you want write or delete access (anything other than read access) to a file
that just got created (by yourself or someone else, does not matter),
chances are you will find the file is being accessed by some other process,
and your access is not granted.
The other process very likely is some server code that is there to assist you
somehow. Candidates are:
- anti-virus software (Norton, McAfee, whatever)
- indexing software (Google Desktop, MS Office, whatever)
The common thing is these packages are looking all the time for new files, so
they can inspect them.
Microsoft is aware of the consequences; Windows Explorer will try rename and
delete attempts up to five times (with one-second interval), and only reports
failure if the action continues to fail for that time.
The solution:
1. either use a different file name
2. or remove all background reader candidates (bad idea)
3. or implement the retry loop as Explorer has it (use a Windows.Forms.Timer
for this)
PS: while debugging and single-stepping, your code runs more slowly and is less
likely to be affected by the above...
Luc Pattyn [Forum Guidelines] [My Articles]
This month's tips:
- before you ask a question here, search CodeProject, then Google;
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get;
- use PRE tags to preserve formatting when showing multi-line code snippets.
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Hi Neetu Maheshwari
i have answered this question fo this question last weekin code project fourms. please search like this "read a file with IO"
thanks
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Hi friends ..
I am facing problem related to tabindex(focus) settings. Whenever I run the project, Initially focus goes to IE's address bar, but tab is
not set for that, how to avoid the focus not to go to address bar.
thanking you in advance ...
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I must have posted this same line of code at least 3 times in the last week...
To set focus on any control on your form, use:
this.ActiveControl= myControl;
Do this at the end of your initialisation of your form to make sure the app is focused on where you want.
He who makes a beast out of himself gets rid of the pain of being a man
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Hello friend
thank you for your reply ... but I want tab not to go in any case
to the IE's address bar ... means I want to block address focus..
waiting for reply
thank you ...
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Aha, I believe you wish to set the "TabStop" property to true.
He who makes a beast out of himself gets rid of the pain of being a man
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Assume I have two classes like this.
class Vehicle
{
public string Name
{
get { return name;}
}
}
class Bike : Vehicle
{
}
class Car : Vehicle
{
}I have a factory class like
class VehicleFactory
{
public static Vehicle CreateVehicle()
{
return new Car();
}
}Here the "Car" instance is down casted into "Vehicle" instance. Is this performance costly ? Or an approach with interfaces like the below one is better ?
interface IVehicle
{
void Name
{
get;
}
}
class Vehicle
{
public string Name{ get { return name;} }
}
class Bike : Vehicle , IVehicle
{
}
class Car : Vehicle , IVehicle
{
} and the factory returns IVehicle instance.
class VehicleFactory
{
public static IVehicle CreateVehicle()
{
return new Car() as IVehicle;
}
}Which one do you suggest ?
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N a v a n e e t h wrote: Here the "Car" instance is down casted into "Vehicle" instance. Is this performance costly ?
No.
N a v a n e e t h wrote: Or an approach with interfaces like the below one is better ?
It depends on what you are ultimately trying to achieve. However, you may want to make Vehicle implement the IVehicle interface rather than Car or Bike as the Vehicle base class is what is actually implementing the interface.
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Colin Angus Mackay wrote: However, you may want to make Vehicle implement the IVehicle interface rather than Car or Bike as the Vehicle base class is what is actually implementing the interface.
Thanks Colin. I also had doubt about this. Let me change it and try. Thanks again.
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IMO, without pulling numbers out my arse:
Casting reference objects is extremely cheap.
You dont have to worry about that kind of things, up and downcasts will never ever be close to other performance issues in an application.
Eg, db connections, db queries, tcpip connections, rendering html and all that kind of stuff.
Premature optimizations are bad.
You will end up spending time and resources on things that doesnt matter.
So rule of thumb, if there is a Db or Webserver involved, you can do pretty wild stuff w/o running into performance issues since the overhead of DB calls / html rendering / connections is so huge that they overshadow the performance of slow'ish code..
Just my 2 cents.
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Roger Alsing wrote: Premature optimizations are bad.
Thanks. I will take care this.
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As you've had two excellent answers on the performance side, I'm going to turn this question on its head. Rather than looking at which is more performant, take a look at which is easier to develop and test.
Suppose that you want to create a more complex application and you are going to use TDD (Test Driven Development) to write it, it's easier to write and test an application that uses interfaces because you can quickly create Mock Objects that conform to the interface and test the main code in isolation.
Also, have a read up on Inversion of Control (IoC) and get an understanding of how that all hangs together. Philip Laureano has an excellent series of articles here on CP, one of which deals with an IoC container that he wrote.
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