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Hi Guys,
I have two Question.
1) How does the CLR recognize whether the assembly has been manipulated or not?
2) “The combination of hashing and digital signing allows .NET to protect your assemblies from tampering” –
Explain in steps how this is achieved in dot net.
do u have any ideas?
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How can I use the VS2008 profiler to profile UI Thread ?
When I use it to profile my winform, It recorded only the function executed on the Main threadm and not the UI thread.
Thanks,
Berlus
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I think I've found the problem, the function was inlined, so its name doesn't appear in the performance report.
Does anyone know how to measure such functions ?
Thanks,
Eyal
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Hi everyone, I am having very hardtime manipulating the compact datagrid. I don't know how it is work, but it is not like windows datagridview at all. Can any one please help me how do I load data from a string array to the grid , row and columns wise.
thanks very much in advance.
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This is not a C# question, it's more appropriate in and you've posted in the Mobile Development forum so wait for an answer in there.
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Please look at the code below :
private void button1_Click(object sender, EventArgs e)
{
for (int j = 0; j < 3; j++)
{
i = j;
myCurThread = new Thread(new ThreadStart(myThread));
myCurThread.Start();
myCurThread.Join();
}
}
private void myThread()
{
string result = "";
myComport = new ComPort();
myComport.Device = "COM5";
myComport.BaudRate = 115200;
myComport.HardwareFlowControl = myComport.asFLOWCONTROL_ENABLE;
myComport.DataBits = (short)myComport.asDATABITS_DEFAULT;
myComport.StopBits = (short)myComport.asSTOPBITS_DEFAULT;
myComport.Parity = (short)myComport.asPARITY_DEFAULT;
myComport.ComTimeout = 8000;
myComport.Open();
string strUSSD = "AT+CUSD=1,\"" + "*444#" + "\",15";
myComport.WriteString(strUSSD);
if (myComport.LastError == 0)
{
result = myComport.ReadString();
while(result.IndexOf("Result") == -1)
{
result = myComport.ReadString();
Debug.WriteLine("i = " + i + " " + result);
}
}
myComport.Close();
}
Problem is, Thread.Join make the button "halt". This is understandable since Thread.Join will make main thread wait until the other thread is finish.
How to make so the button will not "halt" and the threads is run on order? (Thread 2 wait until thread 1 finish and so on).
Is there any alternative to Thread.Join?
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The threads were useless this way..
eidt: nvm, I see what you want now. Why not just make 1 thread?
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Thank you harold for the suggestion.
Why not 1 Thread? it's because i need to simulate 3 or more request to thread at almost the same time.
I need the thread to run in order (2nd thread wait until 1st thread finis and so on).
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If you need the threads to run in order, then they are not 'at the same time' but after eachother.
It only helps to make 3 threads then if you want to synchronize the start of thread 2 with the middle of thread 1, so there can be a bit of overlap. If no overlap is allowed you just get this:
[ 1 ][ 2 ][ 3 ]
You might as well do this, it has the same length, but a different thread is doing the work:
[ 1 ][ 1 ][ 1 ]
And that is, of course, the same as:
[ 1 ]
Because a thread is already synchronized with itself.
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Maybe i should explain what i'm trying to do :
I have 4 GSM Modems. 3 Modems for both execute and read the result from AT command and 1 Modem for receive sms from clients.
Clients will send an sms with certain format that can be parse by the application.
Since a GSM Modem can't execute 2 AT command at the same time and also i need the answer from the GSM modem for further process, that's why i need the AT command run by an order.
Clients will send the sms at unpredictable time. There's an event to handle "receive sms".
after an sms received, it will check the sms format. If the format is correct then the thread will be called and run the AT command. The answer from AT command is also unpredictable (sometime fast and sometime it will take a longer time). At the time 1st thread execute AT command, there is new sms came in. the 2nd thread must wait until the 1st thread is finish. And so on.
This is just a small code trying to simulate the situation.
I think Thread.Join is the answer but it will make the UI "halt" (it maybe not a button but a tab page control etc), and that what i'm trying to avoid.
Hope this explanation help understand the problem.
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It's not really clear to me yet, sorry..
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Seems like what you need is a queue object: the SMS-handling thread(s) after processing received messages add their AT command to the queue; the 'AT handler' thread waits on the queue being not-empty and processes the command at the front of the queue.
So - one thread per modem, and one queueing object to coordinate them. Plus the foreground thread that your UI operates on.
Just remember to lock the queue object before any operations that touch it since it is being touched by multiple threads.
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Thanks for the reply Chris.
Chris Trelawny-Ross wrote: So - one thread per modem
Yes, i agree with you. That's the concept on my mind on my "large code".
It will be array of threads.
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I dont have a whole lot of experience with threading, but wouldn't it make sense to have your for loop run on its own thread so when you call Join() it locks the current thread (the new thread your for loop is running on)?
So when your button is clicked launch a new thread that runs your for loop.
If at first you don't succeed ... post it on The Code Project and Pray.
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Thank you Adam for the reply.
Sorry Adam, i didn't quite understand your point of view.
Maybe you can provide some "scratch code"?
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As per usual Luc is correct.
But to accomplish what i was saying try something like this.
* note: this is just written into the browser so im sure it wont compile *
private void button1_Click(object sender, EventArgs e)
{
.. disable button
Thread myThread = new Thread(new ThreadStart(Run))
myThread.Start();
}
private void Run(){
for (int j = 0; j < 3; j++)
{
i = j;
myCurThread = new Thread(new ThreadStart(myThread));
myCurThread.Start();
myCurThread.Join();
}
}
private void myThread()
{
....
}
If at first you don't succeed ... post it on The Code Project and Pray.
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Yes, i think this is what you mean in the first reply.
Yes, it's a good logic, Adam. Can i say this is thread inside a thread?
And yes, i try it and it worked. I will try it on "large code".
Thanks Man!.
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Yes, this is a thread inside a thread ... inside a thread.
Really when your application launches a thread is created, your main thread (Thread Count = 1), then when the user clicks the button you launch another thread (Thread Count = 2) then your 2nd thread creates another thread (Thread Count = 3).
This probably isnt the best method to accomplish this, see Luc's post, but it will get the job done.
If at first you don't succeed ... post it on The Code Project and Pray.
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The count there is no use on "large code". I just want to examine that the threads is run on order or not.
Thanks for the suggestion about luc post.
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Use a BackgroundWorker started when the button is clicked. The bgw can then either process each ComPort in sequence (as someone else said, if they are running sequentially, why bother with separate threads?), or the bgw can fire off its own child threads and wait for them to finish, as above. Because the bgw is doing the work, your form remains responsive while the long-running process is under way even if the bgw thread itself is paused or busy. Of course, you then have to decide what happens if someone tries to click the button again while the background thread is already running.
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Thank you David for the reply.
Yes, i will keep it on my mind about BackgroundWorker. Until now, i had not use BackgroundWorker at my "large code" but suppose if i'm having trouble with the UI, i will try the BackgroundWorker.
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if you want a number of operations to be executed in sequence, but without freezing your GUI, you need exactly one extra thread (Thread, ThreadPool thread, BackgroundWorker) that executes those operations one after the other.
And your GUI thread should never wait on them (nor on anything else) and not call Thread.Join(); instead you should keep your GUI active, however also disable the features you want disabled for as long as the other thread is working for you.
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Thank you for the reply Luc.
Ok, i see there's 3 key point here to solve the problem :
1. Thread
2. ThreadPool
3. BackgroundWorker
I will investigate it further.
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Endien wrote: 3 key point here to solve the problem
No, the key points are to keep the GUI/main thread free, never to block it, and to hire as many other team players as you need, no more, no less.
The exact type of your additional team player is of minor importance. BackgroundWorker is slightly harder to set up, but offers advantages for reporting progress, completion, and exceptions.
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Hello...
How can I get the Length of a column of an sql table from my C# code....
In my application I am using databound controls. I want to know the length of the field in UI.
any help would be appreciated...
Thanks
Sebastian
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