|
Hey guys,
the page is wonderful, but I've got a problem with C# .NET! I wanna do some Clipboard things in a Timer, but it will not work because of the MTA Mode and I have no clue how to set it to STA Mode.
Pls help me!!!
|
|
|
|
|
Add the [STAThread] attribute above your Main method. The main method will most likely be in the static class Program inside of the Program.cs file.
namespace YourProgram
{
class Program
{
[STAThread]
static void Main()
{
}
}
}
█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██
|
|
|
|
|
Well I do recall some adventures we once had around the STA/MTA stuff.
We started of in STA (isnt that the default?) and had to switch to MTA to
achieve a sufficient level of parallellism.
So what I'm telling you is turning MTA down to STA, while solving one problem,
may introduce new problems performance wise. It just seems wrong to me that
there is such a global decision to make... or maybe I never sufficiently
understood it all in the first place.
Luc Pattyn
|
|
|
|
|
I think you didn't understand me!
My main Thread is in STA! It is like you say!
But when I start a Timer, it makes a new Thread and a new thread is not the main thread, so it is in MTA Mode and there is no way to turn it to STA!!!!
Just try this:
make a little Form with just one button, which starts with a Timer this function:
private void TimerProc()
{
Clipboard.SetText("test text");
}
It won't work, because the Timer thread is in MTA Mode and the Clipboard class need to be used in a STAThread!!!
|
|
|
|
|
new_era88 wrote: It won't work, because the Timer thread is in MTA Mode and the Clipboard class need to be used in a STAThread!!!
Are you using the
System.Threading.Timer
System.Timers.Timer or the
System.Windows.Forms.Timer?
█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██
|
|
|
|
|
Just like the title says, I use System.Timers.Timer!
The SetAppartmentState() Method exists just for Threads, but not for a Timer!
When I use a
while(true)
{
dosomething();
Thread.Sleep(1000);
}
my whole windows get stuck for a while and I don't know why!
nevertheless thanks for your help!
|
|
|
|
|
Use the System.Windows.Timer, I tried it and it works. Text gets set to the clipboard and when I get it out it is the text I put in.
Also the [STAThread] attribute is set (it is default for WinForms apps) just in case it is not currently set to that in your project.
█▒▒▒▒▒██▒█▒██
█▒█████▒▒▒▒▒█
█▒██████▒█▒██
█▒█████▒▒▒▒▒█
█▒▒▒▒▒██▒█▒██
|
|
|
|
|
Yes!!!!!!!!!!
You are my Hero!!!!
It works!!!!
Thank you and thanks to all of you who tried me to help!
|
|
|
|
|
You can create a new thread and let it sleep for a while:
Thread thd = new Thread(new ThreadStart(runTimer));<br />
<br />
thd.Start();<br />
<br />
void runTimer(){<br />
while(true) {<br />
Console.WriteLine("Timer fired");<br />
Thread.Sleep(1000);<br />
}<br />
}
You can change the threadmodel of a thread to STA, while keeping the rest in MTA model.
See this MSDN article: http://msdn2.microsoft.com/en-us/library/system.threading.thread.apartmentstate.aspx[^]
Hope this helps a bit to get you going in the right direction.
WM.
What about weapons of mass-construction?
"You can always try to smash it with a wrench to fix that. It might actually work" - WillemM
|
|
|
|
|
Yes, I remember now.
You CAN set the MTA/STA for each thread individually,
use Thread.AppartMentState on 1.1
or Thread.SetAppartMentState on 2.0
but you can set it only once for any particular thread !
Luc Pattyn
|
|
|
|
|
Hi there.
I'm writing a hash file converter to convert a set of file hashes from one vendors format to another.
As input I have a 32 byte long string containing a hash value stored in a byte[32] array:
6A87A34023132CF8F6D7FDFFB269E3FA
I want to convert this into a 16 byte value such that the hex representation is the same, ie:
byte[16] = {0x6A,0x87,0xA3 ... }.
I hope this makes sense, I'm really struggling with this as my binary skills are not so sharp...
Any assistance woud be greatly appreciated.
Kind regards,
John.
|
|
|
|
|
No, it doesn't really make sense...
What is a "32 byte long string"? A string consists of characters, not bytes. It looks like you have a string containing 32 characters, but that will occupy 64 bytes.
Have you really stored the string in a byte[32] array? How? Have you encoded the string? Then you should decode the string using the same encoding.
Once you have the data as a string, you can split it up into 16 separate strings using the Substring method. Then use the Int32.Parse method with NumberStyles.AllowHexSpecifier to parse each two character string into a byte value.
---
Year happy = new Year(2007);
|
|
|
|
|
Yup, you're right - it's a 32 character long string, however it does only occupy 32 bytes - it's not unicode. No encoding required - it's pure ASCII and is stored as such.
Anyway after much head scratching, I've got the following code to work:
// sHash[32] is a byte array length 32
// eg: the hex value 'A6' is split into sHash[0] & sHash[1]
// the following code will amalgamate this character data into a
// byte array length 16
int l = 0, iFirst, iSecond;
for (int k = 0; k < 32; k += 2)
{
if (sHash[k] > '9')
iFirst = (sHash[k] - 'A') + 10;
else
iFirst = (sHash[k] - '0');
if (sHash[k+1] > '9')
iSecond = (sHash[k+1] - 'A') + 10;
else
iSecond = (sHash[k+1] - '0');
EnHash[l++] = Convert.ToByte(((iFirst * 16) + iSecond));
}
Thanks for your comments above - it's an interesting idea to use int32.parse - I'll give that a go just to see how that works - ultimately it's not too diferent from what I worked out.
Kind regards,
John.
|
|
|
|
|
You did it the hard way, you could use System.Globalization.NumberStyles
example:
int i=int.Parse("12",NumberStyles.AllowHexSpecifier);
sets i to 18 (or 0x12).
So you simply could pass a two-char substring to byte.Parse and reduce your
for-loop body to a single statement.
Luc Pattyn
|
|
|
|
|
That's very cool Luc, thank you.
I think I'll implement that as I guess it will make the program run much faster!
Kind regards,
John.
|
|
|
|
|
Okay, having implemented your code I've got a saving of three seconds with 2755 hashes processed.
My code took 2 mins 33 secs to process, whereas yours took 2 minutes 30 - that's 18.3 hash conversions per second! This is a small sample file so I'm sure that in the real world application of this the savings will be very significant.
Many thanks for your help.
Kind regards,
John.
|
|
|
|
|
|
code_wiz wrote: Is there any reason why MS did not support databinding in these controls even in .NET 2.0?
I think I miss your point!! Both TreeView and ListView have a DataBindings property inherited from Control class, available both in the designer and the code.
Regards ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
|
|
|
|
|
Hi all
I'm new to C# multithreading and I read that to resolve deadlock it is best to use monitor with timeout.With this in mind I used the following code to see what happens to the deadlocking generated.
The result is the following exception
Unhandled Exception: System.Threading.SynchronizationLockException: Object synchronization method was called from an unsynchronized block of code.
Why this? What's wrong with my code or my approach?
Regards
manuStone
class ThreadFoos
{
public static void First()
{
Monitor.TryEnter(ResourceA, 1000);
try{
Thread.Sleep(500);
Monitor.TryEnter(ResourceB, 1000);
try{
Console.WriteLine("First");
}
finally{
Monitor.Exit(ResourceB);
}
}
finally{
Monitor.Exit(ResourceA);
}
}
public static void Second()
{
Monitor.TryEnter(ResourceB, 1000);
try{
Thread.Sleep(500);
Monitor.TryEnter(ResourceA, 1000);
try{
Console.WriteLine("Second");
}
finally{
Monitor.Exit(ResourceA);
}
}
finally{
Monitor.Exit(ResourceB);
}
}
private static object ResourceA = new Object();
private static object ResourceB = new Object();
}
|
|
|
|
|
hi there.
this is what i think.
to start with
http://msdn2.microsoft.com/en-us/library/system.threading.monitor.exit.aspx[^]
which implies that Monitor.Exit can be called on a thread , for a resource only if that thread has already acquired lock for that resource.
you are calling Monitor.Exit (one out of try statements) on threads without assuring that a thread has already successfully acquired monitor on a specified resource. (i.e Monitor.TryEnter may not have been successfull). please Check the returned value from Monitor.TryEnter for both 'First' and 'Second' rountines.
regards.
|
|
|
|
|
Thank you very much for your resposne.
Have a nice day.
Regards
manuStone
|
|
|
|
|
I looked into the DDK which I guess is now know as the WDK. However, its a 1gig download which I would much rather not do. Is there an alternative way to do this in C#?
I would like to build some cmds and then send them to my drive, and get the responses back. How does one do this in the C# environment?
Thx.
|
|
|
|
|
Can you explain what you want to do? 
|
|
|
|
|
I would like to implement the article that used the DDK listed here: http://www.codeproject.com/system/mydvdregion.asp
Except in C#. The WDK is for C and C++ and is a 1-2 gig download I would much rather not do. Any other libraries for sending CDBs to a drive? Thx.
Any help?
|
|
|
|
|
Why do you need the DDK? If you look through the source code you'll see that nothing in the DDK is referenced, he's simply borrowed definitions from the DDK so that people don't need to download it.
To use this in C# all you need to do is translate the C++ to C# et voila. It uses nothing special you'd just need to use P/Invoke to send the commands using DeviceIOCtrl.
I have no idea what I just said. But my intentions were sincere.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
