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• UdpClient receiving and sending at the same time

  - by SoMoS

  Hello, I am maintaining other's code and its using the class UdpClient. The code declares one instance of UdpClient and receives data continuosly using the UdpClient.Receive(). When data is received it is processed in another thread and the UdpClient calls Receive() again. At the same time when the data is processed the same client is sending a response back. Question: Is this a bug? I think so because UdpClient is not thread safe so you can not call two methods at the same time. Anyways code is working fine but ...

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• How to call a WCF singleton service within a WCF singleton service without hanging?

  - by Michael Hedgpeth

  I have two services, one that calls another. Both are marked as singletons as follows: [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)] public class Service : IService And I set these up with a ServiceHost as follows: ServiceHost serviceHost = new ServiceHost(singletonElement); serviceHost.Open(); When the parent service tries to call the child service on the same machine, the parent service hangs, waiting for the child service. I'm already considering moving away from the singleton model, but is there anything wrong with my approach? Is there an explanation for this behavior and a way out of it?

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• Line of code doesnt follow sequential execution

  - by ryudice

  Hi, I'm having a problem with a code that doesnt follow sequential execution although I'm not using threading. My code calls one function and when I'm debugging inside the function, it returns to the line of code following the function call although the function hasnt finished executing, I have no idea why this would happen, any ideas? thanks in advance. workflow.SaveControlTiempo(solEntity, traId, Usuario.GetUsrId());// this is my function RadAjaxManager.GetCurrent(Page).RadAlert("Solicitud Transicionada con \u00c9xito"); // code execution continues here even if the function hasnt finished and since the function hasnt finished I get an exception var javascripFunction = "CloseWindow('Solicitud <b>{0}</b><br />Transicionada con \u00c9xito.<li> <b>Etapa Destino: </b>{1}<li><b>Usuario: </b>{2}');"; javascripFunction = string.Format(javascripFunction, solEntity.SOL_CODIGO, solEntity.WKF_ETP_ETAPAS.ETP_DES, DNNUtil.GetInstance().GetUserName(solEntity.USR_ID));

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• C# Login Dialog Implementation

  - by arc1880

  I have implemented a LoginAccess class that prompts the user to enter their active directory username and password. Then I save the login data as an encrypted file. Every subsequent start of the application, the LoginAccess class will read the encrypted file and check against the active directory to see if the login information is still valid. If it is not, then it will prompt the user again. I have made it so that the reading of the encrypted file and displaying of the login dialog is done on a separate thread. A delegate is fired when the login process is complete. The issue that I'm having is that I have a class that is used in multiple places. This class contains the call to the LoginAccess object. Every time I instantiate a new object there are multiple calls to the LoginAccess object and I get multiple dialogs appearing when it tries to prompt for a username and password. Any suggestions on how to have only one dialog appear would be greatly appreciated.

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• What's wrong with my cross-thread call in Windows Forms?

  - by MainMa

  Hi, I encounter a problem with a Windows Forms application. A form must be displayed from another thread. So in the form class, I have the following code: private delegate void DisplayDialogCallback(); public void DisplayDialog() { if (this.InvokeRequired) { this.Invoke(new DisplayDialogCallback(DisplayDialog)); } else { this.ShowDialog(); } } Now, every time I run this, an InvalidOperationException is thrown on the line this.ShowDialog();: "Cross-thread operation not valid: Control 'SampleForm' accessed from a thread other than the thread it was created on." What's wrong with this piece of code? Isn't it a valid way to make cross-thread calls? Is there something special with ShowDialog()?

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• Access: Data Type Mismatch using boolean function in query criteria

  - by BenV

  I have a VBA function IsValidEmail() that returns a boolean. I have a query that calls this function: Expr1: IsValidEmail([E-Mail]). When I run the query, it shows -1 for True and 0 for False. So far so good. Now I want to filter the query to only show invalid emails. I'm using the Query Designer, so I just add a value of 0 to the Criteria field. This gives me a "Data Type Mismatch" error. So does "0" (with quotes) and False. How am I supposed to specify criteria for a boolean function?

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• Formatting address of different types

  - by mickyjtwin

  I have various classes which all contain address details, i.e. AddressLine1, AddressLine2, AddressLine3, Suburb, Town, etc. On the front end, I need to format the address in a particular way, i.e. AddressLine1<br /> AddressLine2<br /> Suburb State Postcode If AddressLine2 does not exist or empty, don't show it. Quite straight-forward. I am trying to determine the best way to show this info. At the moment, the Address property of each class calls a FormatAddress method which writes out the html string. This exists as a method of the class. My opinion is that any formatting should exist from the front-end control i.e. ascx etc. However, if these DetailClasses need to format the same address info, what would be the best option, also making it easier to maintain?

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• python multithread "maximum recursion depth exceed"

  - by user293487

  I use Python multithread to realize Quicksort. Quicksort is implement in a function. It is a recursive function. Each thread calls Quicksort to sort the array it has. Each thread has its own array that stores the numbers needs to be sorted. If the array size is smaller (<10,000). It runs ok. However, if the array size is larger, it shows the "maximum recursion depth exceed". So, I use setrecursionlimit () function to reset the recursion depth to 1500. But the program crash directly...

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• Browser for cross-site-script testing (for testing Mozilla Add-On)

  - by Anthony

  I am working on a Firefox extension that will involve ajax calls to domains that would normally fail due to the same-origin policy set by Firefox (and most modern browsers). I was wondering if there is a way to either turn off the same-origin restriction (in about:config, perhaps) or if there was a standard lite-browser that developers turn to for this. I really would like to avoid using any blackhat tools, if possible. Not because I'm against them, I just don't want to add another learning curve to the process. I can use curl in PHP to confirm that the requests work, but I want to get started on writing the js that the addon will actually use, so I need a client that will execute js. I also tried spidermonkey, but since I'm doing the ajax with jquery, it threw a fit at all of the browser-based default variables. So, short version: is there a reliable browser/client for cross site scripting that isn't primarily a hacker app? Or can I just turn off same-domain policy in Firefox?

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• Call to C++ COM interface from C# being blocked

  - by dauphic

  I have a C++ DLL that exposes a COM interface. A C# application uses the COM interface. I've recently run into a problem where some calls to the COM interface are taking 500-5000 ms to return, though they should return almost instantly (no longer than 10 ms). Profiling the application shows that all of the delay is being caused by the 'thread being blocked;' no other information is available. There are no locks, etc. in my code, so the blocking has to be occurring internally in the COM/interop code. Only one thread interfaces with the COM DLL. Any ideas what could be causing this, and how I would fix it? EDIT: Further investigation shows that the block is occuring when the C++ returns to the C#.

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• Assembly stack persistency

  - by user246100

  Hello. I would like to know if after calling functions the data I have in the stack is persistent. Like, I would like to know if (assuming cdecl convention) can I do this (independently of function X and independently of optimizations): push 1 push 2 push 3 call X call X call X add 12 esp ? Also, let's say that before the calls I save the address of where the pushed values are in a global variable. Can I, inside X, alter the values it contain by acessing the global variable? Like, for some reason I want that in X I'm able to alter the values in stack so that the second and third call to X receive different values.

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• how to use ob_start?

  - by user187580

  Hello I am using PHPSavant templating system for a project and I am not sure how to use ob_start in this. I have tried before .. for example, page_header.php -- ob_start(); page_footer.php -- ob_end_flush(); But because now I am using a templating system.. am not sure where to put these function. $template = new Savant3(); $template->some_var = $some_value; $template->display('default_template'); the default_template contains all of and populate section using some variables (set to $template object). Should I be using ob_start and ob_end_flush where my html code is or to include on each and every php file which calls to this template? Any ideas? thanks.

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• Date exception when trying to use date method

  - by Simon Andi

  Hi, I have defined a object model where one of the array elements is a string public static String[] columnNames6 = {"Total Shares", "Total Calls", "Call Strike", "Call Premium", "Call Expiry" }; public static Object[][] data6 = { { new Double(0), new Double(0), new Double(0), new Double(0),"dd/mm/yyyy"}, }; I then use the following code to get the date so that I can use the data method but having no joy - Can someone please tell me why it is throwing an exception after I do this String ExpiryDate = (String)GV.data6[0][4]; System.out.println("DATE STRING IS: " + ExpiryDate); Date EndOptionDate = new Date(ExpiryDate); // SOMETHING WRONG HERE even though it compiles okay //Get Todays's Date Date TodaysDate = new Date(); //Calculate Days Option Expiry long DaysDifference = EndOptionDate.getTime() - TodaysDate.getTime(); Would really appreciate some help as really stuck not sure how I should code the line in bold - new to java, so please excuses my lack of knowledge looked at tutorials can't seem to move forward. Thanks Simon

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• Powershell 2.0 error handling - Command line call vs. ISE

  - by Gromix

  Hi, In the context of deployment scripts, I would like to capture any error than happens and stop immediately. I have notice some significant differences between the following calls: powershell.exe -File Script.ps1 powershell.exe -Command "& '.\Script.ps1'" powershell.exe .\Script.ps1 For example, the -File call will handle errors in the exact same way as the ISE. The other two seem to ignore the $ErrorActionPreference variable, and do not seem to catch Write-Error in try/catch blocks. Could someone help me understand the implications of each one, and why they are behaving differently? Thanks, Romain

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• Windows disassembler: looking for a tool...

  - by SigTerm

  Hello. I'm looking for a (preferably free) tool that can produce "proper" disassembly listing from a (non-.NET) windows PE file (*.exe or *.dll). Important requirement: it should be possible to run the listing through a windows assembler (nasm, masm or whatever) and get working exe again (not necessarily identical to original one, but it should behave in the same way). Intended usage is adding new subroutines into existing code, when source is not available. Ideally, tool should be able to detect function/segment boundaries, API calls, and generate proper labels for jumps (I can live without labels for loops/jumps, though, but function boundary detection would be nice), and keep program resources/segments in place. I'm already aware of IdaPRO(not free), OllyDBG (useful for in-place hacking, doesn't generate disassembly listing, AFAIK), ndisasm (output isn't suitable for assembler), dumpbin (useful, but AFAIK, output isn't suitable for assembler) and "proxy dll" technique. Ideas? Or maybe there is a book/tutorial that explains some kind of alternative approach?

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• How invoke live method with arguments

  - by dorelal

  I am learning how to write jQuery plugin. So why I am doing what I am doing does not matter. I writing a plugin called live2 which does nothing else but internally calls live method. (function($) { $.fn.live2 = function() { /* if there are no elements then just return */ if (!this.length) return this; return this.each(function() { var $this = $(this); jQuery.fn.live.apply(this, arguments); }); // end of return this.each(function()) }; // end of plugin })(jQuery); Above code should be invoked just live any live method. Instead of live use live2. $('#container').live2('click',function(){ return false; }) But the plugin is not working. Any idea what the fix should be.

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• How can I interrupt a ServerSocket accept() method?

  - by lukeo05

  Hi, In my main thread I have a while(listening) loop which calls accept() on my ServerSocket object, then starts a new client thread and adds it to a Collection when a new client is accepted. I also have an Admin thread which I want to use to issue commands, like 'exit', which will cause all the client threads to be shut down, shut itself down, and shut down the main thread, by turning listening to false. However, the accept() call in the while(listening) loop blocks, and there doesn't seem to be any way to interrupt it, so the while condition cannot be checked again and the program cannot exit! Is there a better way to do this? Or some way to interrupt the blocking method? Thanks!

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• Alternative to COM blind aggregation in .NET for class with private interface

  - by Philip

  When extending a COM class in unmanaged C++ where the original class has private interfaces, one way to do this is through the concept of blind aggregation. The idea is that any interface not explicitly implemented on the outer aggregating class is 'blindly' forwarded to the inner aggregated class. Now .NET as far as I can figure out does not support COM aggregation natively. A somewhat tedious workaround is to create a .NET class where you implement all the required COM interfaces directly on the .NET class and simply forward to an instance of the actual COM class for any methods you don't want to override. The problem I have is when the original COM object has one or more private interfaces, i.e. undocumented interfaces that are nonetheless used by some consumers of the original class. Using blind aggregation in unmanaged C++ this is a non-issue as the calls to the private interfaces are automatically forwarded to the original class, however I can't find any way of doing the same thing in .NET. Are there any other ways of accomplishing this with .NET?

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• How disable RequiredFieldValidator in script

  - by jlp

  I have TextBox with RequiredFieldValidator on my page. I also have link that calls some simple javascript. <asp:TextBox ID="TextBox1" runat="server" /> <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="TextBox1" Display="Dynamic" /> <asp:LinkButton ID="Link1" runat="server" OnClientClick="DoSomething(); return false;" CausesValidation="false"Text="Do" /> function DoSomething() { textbox1.val("blah"); } How to prevent RequiredFieldValidator to fire when TextBox1 is empty and it looses focus? I want RequiredFieldValidator only to fire on postback.

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• GlassFish Starting Up Java SE Client - No Initial Context Exception

  - by Marcel

  Hi I have developed a java se client that calls some session beans on a glassfish server. I connect to the bean remote interface like this. context = new InitialContext(); em = (ICrudService) context.lookup("java:global/BackITServer/CrudServiceImpl"); This works fine from inside eclipse (gf-client on build path). When I export my project as a runnable jar and call it on the console with java -jar BackItClient.jar I get a NoInitialContextException. MMMM. I would very much appreciate some help. Thank You Greetings Marcel PS: Do I really have to pack all the jars which gf-client is referencing into my jar?

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• Have you been in cases where TDD increased development time?

  - by BillyONeal

  Hello everyone :) I was reading http://stackoverflow.com/questions/2512504/tdd-how-to-start-really-thinking-tdd and I noticed many of the answers indicate that tests + application should take less time than just writing the application. In my experience, this is not true. My problem though is that some 90% of the code I write has a TON of operating system calls. The time spent to actually mock these up takes much longer than just writing the code in the first place. Sometimes 4 or 5 times as long to write the test as to write the actual code. I'm curious if there are other developers in this kind of a scenario.

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• How to get the quickfix timestamp?

  - by yves Baumes

  I've seen in quickfix doxygen documentation that it generates an utc timestamp as soon as it has received a FIX message from a socket file. Have a look in ThreadedSocketConnection::processStream(), it calls then m_pSession->next( msg, UtcTimeStamp() ); I would like to get that timestamp, because I need it to screen network and QuickFix lib latencies. I didn't find a way to get it from FixApplication::fromApp() callback or 'Log::onIncoming()' callback. As I am newbie with quickfix I would like to know if I missed something in the Quickfix documentation. Did anybody ever done that before? Of course there is other solutions, but for homogeneity with others market acces applications I maintain, I would prefer to avoid them. For instance, I would prefer not to modify QuickFix code source. And I would like to avoid re-write the application logic that quickfix provide me, quickfix helpping me only for message decoding.

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• Jquery - intercept links created by ajax request

  - by Kaskade

  Hi, I have some jquery code that intercepts links clicked on a page : $(document).ready(function() { $("a").click(function() { //do something here }); }); My problem is there are certain parts of the page that have not finished loading on document ready. They are populated via ajax calls. The links in these sections are not intercepted by my jQuery function above. I need the function to be run on document ready initially but then I need the new links to also have the same logic applied to them. Any help would be very much appreciated. This is an area that I am very unfamiliar with. I have written the jQuery stuff but the ajax code is an external component that I have no control over. Thanks in advance

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• When to release the model(representedObject) of the corresponding UIViewController.

  - by user313786

  Hi, In AppKit we have "representedObject" available through NSViewController, this representedObject is generally set to ModelController or the model which the NSViewController displays, this works great with bindings as you just set the new representedObject and model details are updated in the view, BUT in case of iPhone (UIKit, with NO Cocoa bindings available), there is no such representedObject in UIViewController so here are few things I am interested in knowing:- What is the best/recommended way of binding the model to the UIViewController?, preferably dont want to maintain lot of IBOutlets and calls setters to updated the changed model data for display in view. How/When should the related model of the UIViewController be released? When is the -[UIViewController dealloc] called, in the typical iPhone application. Am looking for architecting some classes so that the UIViewController coordinates between the view and the model, but at the same time, deallocs the model when ever not necessary. TIA.

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• break dataframe into subsets by factor values, send to function that returns glm class, how to recom

  - by Alex Holcombe

  Thanks to Hadley's plyr package ddply function we can take a dataframe, break it down into subdataframes by factors, send each to a function, and then combine the function results for each subdataframe into a new dataframe. But what if the function returns an object of a class like glm or in my case, a c("glm", "lm"). Then, these can't be combined into a dataframe can they? I get this error instead Error in as.data.frame.default(x[[i]], optional = TRUE, stringsAsFactors = stringsAsFactors) : cannot coerce class 'c("glm", "lm")' into a data.frame Is there some more flexible data structure that will accommodate all the complex glm class results of my function calls, preserving the information regarding the dataframe subsets? Or should this be done in an entirely different way?

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