Re: Process firing event too quickly - C# Discussion Boards

Process firing event too quickly

28-Jan-07 10:00

I trust there is quite a difference between an elementary browser component and a full-
fledged application such as Internet Explorer.

Have you read this recent article[^] ?

Smile | :)

Luc Pattyn

Talal Sultan28-Jan-07 8:59

Talal Sultan

28-Jan-07 8:59

Hi people,

I am running a DOS batch file (.bat) from inside a C# code. I am using the Process class to do that. The problem I have is weird, it seems that on the dev machine, the process is firing the event too quickly (i.e. it is not even executing) and since the call is supposed to create a file on disk, the file of course is not found. On the other hand, on a normal (client) machine, it seems to work, but i'm not sure that it works all the time.

Could anyone give me some solution to this weird problem?

Thanks,
Talal

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
--Rich Cook

Re: Process firing event too quickly

Guffa28-Jan-07 9:15

Guffa

28-Jan-07 9:15

Are you calling the process synchronously or asynchronously? An asynchronous call returns immediately without waiting for the process to finish executing.

---
Year happy = new Year(2007);

Re: Process firing event too quickly

Talal Sultan28-Jan-07 9:20

Talal Sultan

28-Jan-07 9:20

hi,

thanks for the quick reply. well as a matter of fact, I'm calling it asynchronously, I am using the event p.Exited += new EventHandler(Ended) to perform some processing once the command line process has terminated.

Thanks,
Talal

Hardware Simulator

Sabry190528-Jan-07 7:58

Sabry1905

28-Jan-07 7:58

Hi All
I want to know if there is any useful links that can help in building a hardware simulator using C#, if you know a place where I can get information, plz help
thx

Re: Hardware Simulator

Ravi Bhavnani28-Jan-07 8:24

Ravi Bhavnani

28-Jan-07 8:24

By "hardware simulator", I assume you're talking about digital circuits. If so, are you referring to a generic simulator (that can model at the gate level) or are you interested in simulating a simple CPU?

This[^] Wikipedia article provides a high-level overview of HDL if you're looking at gate level simulation. If you're looking to simulate a simple CPU, send me email and I may be able to offer you some hints offline. (My thesis was a simulator for a 1K RAM CPU).

Cheers,

/ravi

This is your brain on Celcius
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

Re: Hardware Simulator

Sabry190529-Jan-07 1:37

Sabry1905

29-Jan-07 1:37

Hi ravi
thx for your quick response,
I am interested here in simulating a many simple CPU's that works in parallel, you can think of it as multi processors

Displaying image in Gridview

fahiemulleh28-Jan-07 7:39

fahiemulleh

28-Jan-07 7:39

Hi all. I have three columns in Table say A , B , C. The datatype of all columns is BIT . At a time, only one value can be true. like

A B C
true false false
false true true

Now, in gridview, I want to show that if the value of column A is true, it has to show some image else no image.

Please tell me how to do that. I will be very thankful to you.

Thanks for your anticipation.

Do you know NET 2.0 documentation tools?

cebyrjoe228-Jan-07 7:35

cebyrjoe2

28-Jan-07 7:35

Hello,

I would like to ask you about tool, which can generate documentation for projects in .NET 2.0 based on XML documentation files.

I know only an unofficial version of NDoc with support for .NET 2.0.

http://jonas.lagerblad.com/blog/?p=4

Maybe you know alternative to this tool?

Thanks in advance

cyberjoe

Re: Do you know NET 2.0 documentation tools?

Stefan Troschuetz28-Jan-07 8:12

Stefan Troschuetz

28-Jan-07 8:12

Take a look at the following article here on CP: Sandcastle Help File Builder[^]

Thread Id and Thread name

MinaFawzi28-Jan-07 5:43

28-Jan-07 5:43

Hello all

is there any method to bind the thread name property of the thread class with the id property of the processThread class.

my application create more than one thread bt i cant keep track of them as i cant map the id with the name

Please Help

MiNa

Luc Pattyn28-Jan-07 6:11

28-Jan-07 6:11

I had been looking for this too, and did not find anything.

Threads do have a name, but we programmers have no control over it.

The .NET doc says the name of a System.Thread can be set once, if that is also
true for the underlying Win32 thread object, then I am afraid .NET gives it the
name "Thread" and we can't do anything about it.

Frown | :(

Luc Pattyn

MinaFawzi28-Jan-07 6:19

28-Jan-07 6:19

Thanks,

I was trying to assign an id to each thread by getting the last thread id added to the processThreadCollection directly after starting the thread to ensure that this ID belong to the just started thread.
and then i can track the thread wether they are running or not and knowing the state of them,
but this solution is risky as the number assigned may be wrong.

Any other suggestions ?

MiNa

Luc Pattyn28-Jan-07 7:00

28-Jan-07 7:00

Some ideas:

1)
Inside your app you could attach a name to your thread by using a hash table;
that could help keeping track of things, but it only lives inside your app.

External tools for watching processes, threads and other resources (such as TaskInfo)
would not know about it of course.

2)
When your app contains logging, you could add a thread identification, based on ID
or attached name, or whatever (always starting with Thread.CurrentThread).
If your threading situation gets complex, you really should do this.

3)
whatever you come up with, some threads will not follow your scheme, e.g.
Threadpool threads, Backgroundworkers, etc.
But I avoid these, since you dont have full control over them (set priority, kill, ...).

4)
I tend to use my own thread class that holds a thread and a descriptive text, but also a
mechanism to report progress and a means to cancel/kill/abort
(I started doing this before NET 2.0, so before Backgroundworkers were available).

Smile | :)

Luc Pattyn

MinaFawzi28-Jan-07 7:14

28-Jan-07 7:14

how do i can keep track the threads using hash table ?
i want to know the state of the thread i created.
and all the info about the threads in the processThreadCollection is the ID

and actually i dont know which thread has this ID

Thanks again for your help

MiNa

Luc Pattyn28-Jan-07 9:55

28-Jan-07 9:55

Hi,

the following is not correct, it gives the ideas, first for .NET 1.1 then 2.0

with .NET 1.1:

when you create a thread, insert it in a hashtable

Thread thread=new Thread(...);
threadHash.Add(thread, "Searching database");  // <<< keep thread and descriptive text
thread.Start();

you can now list all your threads:

foreach (DictionaryEntry de in treadHash) {
    string descr=(string)de.Value;
    Thread thread=(Thread)de.Key;
    ...show the thread, its ID, its state and descr
}

the only caveat is: doing this keeps all thread objects alive, since they are all in
the hashtable, so you should try to throw away the ones you dont need anymore,
either with threadHash.Remove() when a thread comes to an end,
or by periodically checking the thread states.

with .NET 2.0:

when you create a thread, insert it in a hashtable

Thread thread=new Thread(...);
threadHash.Add(thread.ManagedThreadID, "Searching database");  // <<< keep ID and descr
thread.Start();

you can now list all your threads using

foreach (Thread thread in processThreadCollection) {
    string descr=threadHash[thread.ID];
    ...show the thread, its ID, its state and descr
}

Since you are not holding a collection of thread, there is no cleanup problem.

Smile | :)

Luc Pattyn

Parwej Ahamad28-Jan-07 6:28

Parwej Ahamad

28-Jan-07 6:28

Plz refere.........
System.Monitor class
Protecting Code by Using the Monitor Class
The System.Monitor class enables you to serialize the access to blocks of code by means of locks and signals. For example, you have a method that updates a database and that cannot be executed by two or more threads at the same time. If the work being performed by this method is especially time-consuming and you have multiple threads, any of which might call this method, you could have a serious problem on your hands. This is where the Monitor class comes in.

Parwej Back...............DON of Developer.......
Parwej Ahamad
g_parwez@rediffmail.com

MinaFawzi28-Jan-07 7:10

28-Jan-07 7:10

Thanks

do you mean i have to lock the code that start the thread and gets the last added thread in the processThreadCollection to ensure that the number assigned to the thread is the correct number in the processThreadCollection ??

Thanks again

MiNa

Parwej Ahamad28-Jan-07 7:13

Parwej Ahamad

28-Jan-07 7:13

Plz refere this code.............

using System;
using System.Threading;

class Database
{
public void SaveData(string text)
{
lock(this)
{
Console.WriteLine("Database.SaveData - Started");

Console.WriteLine("Database.SaveData - Working");
for (int i = 0; i < 100; i++)
{
Console.Write(text);
}

Console.WriteLine("\nDatabase.SaveData - Ended");
}
}
}

class ThreadLockApp
{
public static Database db = new Database();

public static void WorkerThreadMethod1()
{
Console.WriteLine("Worker thread #1 - Started");

Console.WriteLine
("Worker thread #1 - Calling Database.SaveData");
db.SaveData("x");

Console.WriteLine("Worker thread #1 - Returned from Output");
}

public static void WorkerThreadMethod2()
{
Console.WriteLine("Worker thread #2 - Started");

Console.WriteLine
("Worker thread #2 - Calling Database.SaveData");
db.SaveData("o");

Console.WriteLine("Worker thread #2 - Returned from Output");
}

public static void Main()
{
ThreadStart worker1 = new ThreadStart(WorkerThreadMethod1);
ThreadStart worker2 = new ThreadStart(WorkerThreadMethod2);

Console.WriteLine("Main - Creating worker threads");

Thread t1 = new Thread(worker1);
Thread t2 = new Thread(worker2);

t1.Start();
t2.Start();
}
}

Parwej Back...............DON of Developer.......
Parwej Ahamad
g_parwez@rediffmail.com

MinaFawzi28-Jan-07 7:17