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I wonder why you wouldn't want to do it? Aborting a thread is usually a very bad idea. If you have to do it, you might want to use remoting. Make the service host an object, access the object in your ASP .NET app, and call a method on it to abort the thread.
Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro
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Thanks Senthil,
The thing is I have to abort the thread when user command so..
Can you give me an example of it.. how do I create a object of the thread selected by the user.
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hi,
i dave developed a .net component that is working fine in dot net projects but i want to add this component to a vb 6.0 project for that i have assigned strong name to the project but following problem is hindering
i am using some activex components (one of them is Microsoft.Scripting and other is thirdparty component) in my dotnet component, and i am not able to assign any string name to these components,
what should i do to make my component workable with vb 6.0
regards,
Arus
-- modified at 10:53 Monday 3rd October, 2005
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Hello,
I have a select statement:
<br />
DataRow[] belowRow = this.dataview.Table.Select("Description = Stage "+stageNumber+" Value");<br />
where stageNumber is the integer.
I get the Missing Operator error message when trying to execute the select statement. Any ideas?
Thank you.
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Are you trying to put together a string value in the condition?
DataRow[] belowRow = this.dataview.Table.Select("Description = 'Stage "+stageNumber+" Value'");
---
b { font-weight: normal; }
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Hi for all
I've readed the Dominique Bijnens' article "Background applications listening for keyboard activity" that explains how to read the keyboard even in background. There are some pieces of code that I didn't understand. Dominique explains that the KeyHandler function will be called when a key is pressed of the keyboard. What I didn't understand is when and where the static constructor of the KeyboardListener class is called. Below some pieces of code of their article.
Please, who have a little(or a lot) bit of patience answer this question for me.
Thanks a lot for help
private static void KeyHandler(ushort key, uint msg)
{
if(s_KeyEventHandler != null)
{
Delegate[] delegates = s_KeyEventHandler.GetInvocationList();
foreach(Delegate del in delegates)
{
EventHandler sink = (EventHandler)del;
try
{
// This is a static class, therefore null is passed as the object reference
sink(null,new UniversalKeyEventArgs(key,msg));
}
// You can add some meaningful code to this catch block.
catch{};
}
}
}
#endregion
#region Public declarations
///
/// An instance of this class is passed when Keyboard events are fired by the KeyboardListener.
///
public class UniversalKeyEventArgs : KeyEventArgs
{
public readonly uint m_Msg;
public readonly ushort m_Key;
public UniversalKeyEventArgs(ushort aKey, uint aMsg) : base((Keys)aKey)
{
m_Msg = aMsg;
m_Key = aKey;
}
}
///
/// For every application thread that is interested in keyboard events
/// an EventHandler can be added to this variable
///
public static event EventHandler s_KeyEventHandler;
#endregion
#region Public methods
static KeyboardListener()
{
ListeningWindow.KeyDelegate aKeyDelegate = new ListeningWindow.KeyDelegate(KeyHandler);
s_Listener = new ListeningWindow(aKeyDelegate);
}
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The static constructor of a class is called whenever this class is used for the first time, where 'using' may be access to some static field, property or function or instantiation of it.
In this case I would assume that it is called when someone binds the s_KeyEventHandler event.
You can easiliy find it out by yourself: Set a breakpoint into the static constructor and if the program breaks there just look into the stack trace.
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Thanks Robert, now I understand. I didn't know that static constructors was called when the class is used.
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There is no culture specified for (Amharic) ethiopia
but i've used the affrikans culture to fit my needs by customizing the properties
now i wanted to use the DateTimeFormatInfo to change the way my dates looked on the
app and to have it a local feel i inherited from the System.Globalization.Calendar class
to make my own EthiopianCalendar class. But the propblem is i can not assign
this class's instance to the Affrikans culture in stance DateTimeFormatInfo property.
I tried to have a new writeble instance for the DateTimeFormatInfo but setting the caelndar
property results in InvalidOperationException i think caelndars can not be assigned if they
are not listed in the optional calendars list.
But why did microsoft made the Calendar class abstract, there is no use in inheriting
from this class if we can't set it to a DateTimeFormat.Calendar property, or we have to write our own
class that implements IFormatProvider like DateTimeFormatInfo (that's sad) ????
Is there any way to get around this ??
I've asked this question before but no one was able to give me an answer. if u can ....
-- modified at 10:25 Monday 3rd October, 2005
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I need to convert a string made up of date/time + 9 digit number in to hex value then into a string...any ideas ?
i.e.
convert "20050910120013123456789" into Hex string equivalent
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I think this could work!
1st:
Convert the string into Int64;
string datetimestring;
Int64 datetimeint64 = Convert.ToInt64(datetimestring);
2nd:
Convertion to Hex, by using this Method:
string hexstring = IntToHex(datetimeint64);
public string IntToHex(System.Int64 number)
{
return String.Format("{0:x}", number);
}
Hope it works!
Good luck,
Martin
-- modified at 10:23 Monday 3rd October, 2005
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I've tried that but the number is too large to convert to a Int64
i.e.
string sTemp = DateTime.Now.ToString("yyyyMMddHHmmss")+"123456789";
Int64 iTemp = Convert.ToInt64(sTemp);
Throws exception......
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Would a Decimal work? It has an integral range of 2^96 bits
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Ya a decimal will hold the value, but then how do you convert the decimal into Hex string ?
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Integer division will let you split it into high and low 64bit chunks. Then convert the int64's into strings as before and concatenate them.
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Would you mind elaborating a bit Dan ?
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Once you have the decimal value, use String.Format to print the Hex value. For example:
decimal d = 41476521;
string s = String.Format("{0:X}", d);
X --> uppercase A to F letters
x --> lowercase a to f letters
This MUST work
___________________________________
Tozzi is right: Gaia is getting rid of us.
My Blog [ITA]
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No it does not work.....try it:
string sTemp = DateTime.Now.ToString("yyyyMMddHHmmss")+"12345678";
decimal dTemp = Convert.ToDecimal(sTemp);
Console.WriteLine(String.Format("{0:X",dTemp));
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You should use decimal.Parse(sTemp)
The Convert class is not for converting a string into a numeric value.
___________________________________
Tozzi is right: Gaia is getting rid of us.
My Blog [ITA]
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ok, I get the same value as Convert.ToDecimal(sTemp), but regardless I still get an exception when I try and format the decimal value as a Hex string with the "X" format specifier.
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Very odd...
According to MSDN the "X" specifier prints the value in hex format.
The Format method can throw only 2 exceptions: ArgumentNullException (for the string argument) and FormatException (if the format specifiers are not valid).
MSDN tells the "X" specifier is valid only for integral number types, including (in my opinion) the decimal.
If the decimal is not supported (FormatException), the only way I know is to perform a 'manual' conversion to hex. Maybe there are some libs.
You should know how to convert a number to hex. If not, try this:
Perform a serie of divisions to 16, the rest is the hex digit. For example:
--> 315
315 / 16 = 19, rest 11 (B)
19 / 16 = 1, rest 3
1 / 16 = 0, rest 1
(continue until the result of the division becomes zero)
The hex value is 13B (reverse!!!)
___________________________________
Tozzi is right: Gaia is getting rid of us.
My Blog [ITA]
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hi to all,
can some one please tell me why i get
<br />
An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll<br />
<br />
Additional information: Exception has been thrown by the target of an invocation.<br />
for this class, it was working fine until i added the serialization of the ping counter, i tried subclassing the ISerializable in the IPingResponse interface instead but i get the same error
<br />
using System;<br />
using System.Runtime.Serialization;<br />
<br />
<br />
namespace RemotingInterface<br />
{<br />
[Serializable()]<br />
public class PingResponse : ISerializable, IPingResponse<br />
{<br />
private DateTime requestTime;<br />
<br />
private DateTime receiveTime;<br />
<br />
private int pings;<br />
<br />
<br />
#region Serialisation Functions<br />
<br />
public PingResponse(SerializationInfo info, StreamingContext ctxt)<br />
{<br />
this.requestTime = (DateTime)info.GetValue("RequestTime", typeof(DateTime)); <br />
this.receiveTime = (DateTime)info.GetValue("ReceiveTime", typeof(DateTime)); <br />
this.pings = (int)info.GetValue("PingCount", typeof(int)); <br />
}<br />
<br />
public void GetObjectData(SerializationInfo info, StreamingContext ctxt)<br />
{<br />
info.AddValue("RequestTime", this.requestTime);<br />
info.AddValue("ReceiveTime", this.receiveTime);<br />
info.AddValue("PingCount", this.pings);<br />
}<br />
<br />
#endregion Serialisation Functions<br />
<br />
public PingResponse(DateTime request)<br />
{<br />
this.requestTime = request;<br />
}<br />
<br />
<br />
public DateTime ReceiveTime<br />
{<br />
set<br />
{<br />
this.receiveTime = value;<br />
this.pings++;<br />
}<br />
}<br />
<br />
public TimeSpan TransmissionTime<br />
{<br />
get<br />
{<br />
return this.receiveTime - this.requestTime;<br />
}<br />
}<br />
<br />
public int PingCount<br />
{<br />
get<br />
{<br />
return this.pings;<br />
}<br />
}<br />
}<br />
}<br />
kind regards,
g00fy
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You should also tell us when this error is coming (while serialization or deserialization).
I would guess its while deserializing data from an old version of this class (where there was no pings field). Thus the line this.pings = (int)info.GetValue("PingCount", typeof(int)); will fail and the error given comes because the constructor is invoked via reflection.
You should probably put a Try-Catch around this line and anaylze the exception to determine if I'm correct. If yes, then you have to decide what to do when dealing with an old instance (e.g. ignoring it and leaving pings at 0).
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<br />
namespace SMSRemotingClient<br />
{<br />
internal class ServerStatusChecker<br />
{<br />
private IRemoteData remoteObject;<br />
<br />
internal ServerStatusChecker(IRemoteData remoteObj)<br />
{<br />
this.remoteObject = remoteObj;<br />
}<br />
<br />
internal void CheckStatus()<br />
{<br />
try<br />
{<br />
IPingResponse response = this.remoteObject.Ping(DateTime.Now); <br />
<br />
response.ReceiveTime = DateTime.Now;<br />
<br />
Debug.WriteLine("ping: " + DateTime.Now.ToString("h:mm:ss.fff"));<br />
Debug.WriteLine("ping turn-around: " + response.TransmissionTime.Milliseconds + " millisecs");<br />
Debug.WriteLine("ping count: " + response.PingCount);<br />
}<br />
catch(SocketException se)<br />
{<br />
Debug.WriteLine("its all gone pear-shaped, the server is offline when trying to ping"); <br />
}<br />
catch(RemotingException re)<br />
{<br />
Debug.WriteLine(re.Message);<br />
}<br />
catch(Exception see)<br />
{<br />
Debug.WriteLine(see.Message);<br />
}<br />
}<br />
}<br />
}<br />
see.Message gives
<br />
The type RemotingInterface.PingResponse in Assembly StationUpdateInterface, Version=1.0.2103.19283, Culture=neutral, PublicKeyToken=null is not marked as serializable.<br />
a try catch aarounf the line you suggested gives nothing, the exception is always from the client
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Did you notice that the exception message has totally changed?
The new error means that the PingResponse class (which I assume is written by you) needs to be serialized. Thus you have to mark it with the Serializable attribute. Do this by just writing [Serializable] just above the class definition:
[Serializable]
public class PingResponse {
...
}
Other possibility would be to implement ISerializable in this class but then you would have to serialize it yourself.
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