IOException Problem... - C# Discussion Boards

Problem Connecting to MQ on unix from .NET application

12-Jul-07 6:12

Hi,

So for every property change, the code executes, creates a new Regex and
makes it Replace something. Regex is an expensive class by itself,
it has to either interpret your intentions, or, optionally generate compiled
code for it (more cost effective only when required over and over, not your case).

If the user types 5 characters for a property, it changes five times.
I would look for a way to run the code less frequently. Some ideas:
- let the user trigger the code by clicking a button or so (less comfortable);
- let a timer trigger the code; maybe have a scheme where the worker runs
say 3 seconds after the last change (i.e. every change starts/restarts a timer,
and only when the 3 seconds elapse is the code executed).

Hope this helps

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

unnamed00712-Jul-07 4:51

unnamed007

12-Jul-07 4:51

Hi,
Am writing an .net windows application in which i have to connect to IBM MQ on remote machine running unix to post messages. This is a tool kinda thing for an enterprise application.

this is the code am using to connect to the MQ.

Code: ( text )
MQEnvironment.Hostname = hostName;
MQEnvironment.Port = port;
MQEnvironment.Channel = "SYSTEM.DEF.SVRCONN";
MQQueueManager qm=new MQQueueManager(queueMgr);

When i try to run the application it throws an exception in
MQQueueManager qm=new MQQueueManager(queueMgr);

Exception details :- CompCode 2 Reason 2035 ..from error code lookup i learnt that its MQRC_NOT_AUTHORIZED.
read somewhere that the user's credentials under whom application is run will be supplied for authorization automatically..if thats the case how is cross platform connectivity is possible...in my case mq client is on windows and
mq server is on unix.

Do i have to specify the userid,password for unix system to override this?
If so, how? MQQueueManager Class doesnt have a constructor that accepts userid/password as a parameter and MQEnvironment doesnt have a property for userid/password..
Am using Websphere Mq 5.3 ? Is the option to specify userid/password available in the latest version 6.0?

seems MQ classes for java have options to specify userid/password but .NET classes didnt.

am pulling my hair over this for the past 3 days...please help..

String containing digit or Alphabet

t4ure4n12-Jul-07 4:33

t4ure4n

12-Jul-07 4:33

I have a variable

string input

How do i detect if variable has digit in it or an alphabet.

o O º(`'·.,(`'·., ☆,.·''),.·'')º O o°
»·'"`»* *☆ t4ure4n ☆* *«·'"`«
°o O º(,.·''(,.·'' ☆`'·.,)`'·.,)º O o°

Re: String containing digit or Alphabet

User 665812-Jul-07 4:43

User 6658

12-Jul-07 4:43

t4urean wrote:
How do i detect if variable has digit in it or an alphabet.

In terms of an exclusive or?

To check, if the string is a number:

int i = int.TryParse(input)

If it's just one digit:

int i = int.TryParse(input) and then i =< 9 && i >= 0

If it contains one or more alphabets:

bool b = Regex.IsMatch(input, "[a-zA-Z]")

regards

modified 12-Sep-18 21:01pm.

Re: String containing digit or Alphabet

Luc Pattyn12-Jul-07 4:45

Re: String containing digit or Alphabet

12-Jul-07 4:45

Hi,

you can walk the individual characters of the string:

for (int i=0; i<input.Length; i++) {
    char c=input[i];
    ... do something with c
}

or equivalently (unless you want to change c, wouldnt work here):

foreach (char c in input) {
     ... do something with c
}

and you can use one of many many methods available in String class,
such as IndexOf() and Contains()

May I suggest you at least read the MSDN documentation on String class;
or better yet work your way through a introductory C# book.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Christian Graus12-Jul-07 4:53

Christian Graus

12-Jul-07 4:53

You can use regex, or iterate over the chars and use things like char.IsDigit.

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

IOException Problem...

Andy Spier12-Jul-07 4:23

12-Jul-07 4:23

For some reason my IOException is not being caught... if my Frame (SettingsPane) tries to go to a non-existent XAML page in my resources (in a folder), it gives me this exception but I tell it to handle it and it totally ignores it for some reason. My catch statement is there but when I attempt to load a non-existent page, I see the exception. Why isn't it being caught by my catch statement?

Another question if this can't be answered... how do I check if a resource exists in my application? If I can test the existence of the resource my app is trying to find, I wouldn't have to deal with this exception in the first place.

Here is a screenshot of what I'm dealing with here...

Screenshot

Luc Pattyn12-Jul-07 4:28

12-Jul-07 4:28

Hi,

my best guess is you have nested exceptions, and the IOException shown is at
a lower level.

suggestion for verification: temporarily change your catch to catch Exception exc
and print exc.ToString(), it should reveal everything.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Andy Spier12-Jul-07 4:33

12-Jul-07 4:33

void PropertyTree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)<br />
        {<br />
            if (((XmlElement)PropertyTree.SelectedItem).Name == "Panel")<br />
            {<br />
                try<br />
                {<br />
                    SettingsPane.Source = new Uri(((XmlElement)PropertyTree.SelectedItem).GetAttribute("Uri"), UriKind.Relative);<br />
                }<br />
                catch (Exception exc)<br />
                {<br />
                    //AveSkin.Pages._04 mypage = new AveSkin.Pages._04();<br />
                    //mypage.SetMessage(((XmlElement)PropertyTree.SelectedItem).GetAttribute("PanelHeader"));<br />
                    //SettingsPane.Navigate(mypage);<br />
                    MessageBox.Show(exc.ToString());<br />
                }<br />
            }<br />
            <br />
        }

... is what I have now. I reproduced the exception and it shows the same IOException again (depending on which TreeViewItem I click on (change selection) and I never did get a MessageBox shown within my catch statement...

Thanks for the quick reply!

Luc Pattyn12-Jul-07 4:52

12-Jul-07 4:52

The IOException window you get has a "copy to clipboard" facility;
could you please use it and show all the lines preferarbly formatted
line by line, not just as a wrapping stream).

That should tell us something...

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Andy Spier12-Jul-07 4:59

12-Jul-07 4:59

Hope this is how you wanted it. Smile | :)

System.IO.IOException was unhandled
Message="Cannot locate resource 'pages/customtrackinfo.xaml'."
Source="PresentationFramework"
StackTrace:
at MS.Internal.AppModel.ResourcePart.GetStreamCore(FileMode mode, FileAccess access)
at System.IO.Packaging.PackagePart.GetStream(FileMode mode, FileAccess access)
at System.IO.Packaging.PackWebResponse.CachedResponse.GetResponseStream()
at System.IO.Packaging.PackWebResponse.GetResponseStream()
at System.IO.Packaging.PackWebResponse.get_ContentType()
at System.Windows.Navigation.BaseUriHelper.GetContentType(WebResponse response)
at System.Windows.Navigation.NavigationService.GetObjectFromResponse(WebRequest request, WebResponse response, Uri destinationUri, Object navState)
at System.Windows.Navigation.NavigationService.DoNavigate(Uri source, NavigationMode f, Object navState)
at System.Windows.Navigation.NavigateQueueItem.Dispatch(Object obj)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.runTryCode(Object userData)
at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.Run()
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at AveSkin.App.Main() in C:\Documents and Settings\DocMARs\My Documents\Visual Studio 2005\Projects\AveSkin2\AveSkin2\obj\Debug\App.g.cs:line 0
at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

Luc Pattyn12-Jul-07 5:18

12-Jul-07 5:18

Gee, that is a terrible trace.
I noticed Threading.ExceptionWrapper.TryCatchWhen at two distinct locations,
and a Threading.Dispatcher.WndProcHook in between.

Are you just clicking some control ???

Can I assume the following ?
your .NET is 2.0 or better
you never set Control.CheckForIllegalCrossThreadCalls false
your app doesnt have other anomalies

I dont understand, but I would suggest three things:

1.
keep the try-catch(Exception exc) for now

2.
you split the suspicious line in smaller parts, e.g. URI=new URI...

3.
you add the following at the start of the offending method:

Console.WriteLine(Environment.StackTrace);

so that should tell us how you get there.

Good luck.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Andy Spier12-Jul-07 5:27

12-Jul-07 5:27

Sorry, I should have provided more information...

I'm using .NET Framework 3.0 coding a WPF application.
And I don't know if this has anything to do with it but it might...

In the same if-statement, I had the same try-catch statement with a NullReferenceException in the catch statement but I changed it to IOException when I was getting IOExceptions because I had to change my code in the try block and if the Frame control couldn't find the XAML page it was looking for in the try block, it throws the IOException.

Does this help you?

Luc Pattyn12-Jul-07 5:50

12-Jul-07 5:50

Andy Spier wrote:
Does this help you?

Not really.
I dont quite understand it; you first were prepared to handle NullRefs, then
decided not to handle them anymore ?

Anyhow, I stand by my recommendation to split the difficult line, and keep
the catch (Exception) for now.

Have been looking at Visual itself; you have some say in which exceptions
get intercepted by Visual, rather than passed on to your app. Have a look
at menu Tools/Options/Debugging/General, first two checkboxes.

I dont pretend to understand it all, first is unchecked (cross appdomain,
I dont use extra appdomains so does not matter), second is checked (enable
assistant). You may want to try different settings and/or read up on what
they mean, then decide what you want.

You also may want to try and run your app outside Visual...

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

Luc Pattyn12-Jul-07 5:54

12-Jul-07 5:54

Forgot to mention: in my experience it is useful to have a try-catch(Exception)
around the Application.Run line in static Main() method too; I typically
show a MessageBox with "fatal error; contact so and so" plus the entire
Exception.ToString()

Furthermore there is an Application.ThreadException thing that I still have
to investigate; you probably should consider that too.

Smile | :)

Luc Pattyn

try { [Search CP Articles] [Search CP Forums] [Forum Guidelines] [My Articles] }
catch { [Google] }

martin_hughes12-Jul-07 10:52

martin_hughes

12-Jul-07 10:52

Best bet:

This is a problem with the VS2005 CTP Tools you're using. Try it with the Orcas beta and see if you get the same result.

Andy Spier12-Jul-07 16:19

12-Jul-07 16:19

Luc Pattyn:
- I tried a release build outside of Visual Studio.
- Checking those boxes would hide exceptions displayed in VS2005 only, not in my final release.
- There is no real main method in .NET Framework 3.0 (WPF) Applications...

martin_hughes:
- I downloaded and installed the latest beta of Orcas just now, tried it and was able to reproduce the same exception... Frown | :(

*Still awaiting an answer*

I REALLY appreciate your help and care so far guys. Much appreciated! Smile | :)

Andy Spier14-Jul-07 8:50

14-Jul-07 8:50

I found the solution. Smile | :)

More information for reference at:
MSDN Forums - IOException problems...

The last post (or the answer post) is the solution to this problem.
Briefly, you have to use the NavigationFailed event on your Frame and set e.Handled to true in that event handler to stop the IOException from being thrown.

Then you can write code in result of the navigation failure from there. Smile | :)

Hope this helps anyone having the same problem!
Thanks again for your effort and time in attempting to help me!
It was a mighty confusing problem. I'll know in the future to check for events in certain objects to handle exceptions like these...

~ Doc

Wrapper class

ramdil12-Jul-07 4:00

ramdil

12-Jul-07 4:00

Hi all
i just want to know how to create a wrapper class in c#
because i created dll in 2005 and now i want to use it in 2003 so backward compatibility is not there i want to create a wrapper class and then call it in 2003 version.,.can any one help me what all steps need to be done
Advanced Thanks

Regards
DilipRam

originSH12-Jul-07 4:05

originSH

12-Jul-07 4:05

Thats not really possible, or atleast pretty hard and inefficient to do.

Only one version of the framework can be loaded into a single process at a time. That means you'd have to use either something like an out of process COM server or maybe remoting or something like that.

Either way you'd probably be best off working within the limitations of .Net 1.1 if you want something to be used from 1.1

ramdil12-Jul-07 5:43

ramdil

12-Jul-07 5:43

Hi thanks for the reply.. i can directly change the 2005 code to 2003 and use the dll for reference..but the think is that i have some additional properties which is in 2005 , i have used and are very important for me.so now when i changed to 2003 these properties are not there and hence it is creating very difficult problems.So i heard that there is way to play with it.we want to create a wrapper class and then call the wrapper class object
but i dont know how to create it..can any one help me on this

Regards
DilipRam

originSH12-Jul-07 6:02

originSH

12-Jul-07 6:02

ramdil wrote:
So i heard that there is way to play with it.

Any hints on what you were told might work? :P

As I said there are ways but they are inefficient and not a very good idea at all.

ramdil wrote:
very difficult problems

It can be more akward to use 1.1 under 2003, but I wouldn't say it creates very difficult problems. Most of the time it just means a little more typing.

What is it that your doing in .Net 2.0 that is so vital and you can't do in 1.1?

ramdil12-Jul-07 6:11

ramdil

12-Jul-07 6:11

When i searched the net, some where i saw that only way to work around with this type of issue is to create wrapper class but i dont how to work around it...

Regards
DilipRam