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• Release another user's lock obtained with sp_getapplock on SQL Server

  - by joshperry

  We have a system that uses sp_getapplock to create an exclusive mutex any time someone opens an order in the GUI. This is used to prevent multiple people from making changes to an order simultaneously. Sometimes people will open an order and go home, leaving it open. This effectively blocks anyone from being able to make changes to the order. I then get emails, calls and end up doing a kill <spid> in enterprise manager. Obviously I've gotten sick of this and want to make a quick self-service webform. The main problem I've run into is that kill requires sysadmin privileges, which I do not want to give to the user that the our website runs as. I have tried sp_releaseapplock but this doesn't let you release another user's lock (even when calling it as a sysadmin). So, finally my question; does anyone know of an alternative method to release a lock that was obtained by another user using sp_getapplock?

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• MouseWheel: Scrolling vs. Zooming

  - by beaudetious

  I've got a Silverlight 4 custom control that basically is several Canvas elements wrapped inside a ScrollViewer. The user can set a property to determine whether to scroll or zoom when using their mouses wheel. In the custom control's MouseWheel event, I check to see if they want to scroll or zoom. If zooming, I determine the delta and modify the custom control's zoom level (which then handles the zooming code for me). The problem is that zooming won't start until the ScrollViewer's current position of the vertical scrollbar is at the top or bottom of the scrollbar. Once their, then the zooming works perfectly. Does anyone have any suggestions on how I can prevent scrolling completely so that I only zoom (when the user wants to zoom, that is)? Thanks!

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• Preserving multi-byte characters in Flex XML object

  - by Dan Petker

  I'm having an issue with the Flex XML object type mangling multi-byte characters (such as Japanese or Chinese characters). The basic setup is this. I'm getting an XML-formatted string from the server, and in that string there can be multi-byte characters. A lot of the time, these characters are in attributes, for example: <example id="foo" name="[some multi-byte characters]"/> Now, when I examine the raw string, the multi-byte characters display just fine. However, as soon as I convert the string to an XML object using the top-level XML() function, all the multi-byte characters become mangled. I've tried setting the XML's encoding by including an <?xml version="1.0" encoding="utf-8"?> element in the XML-formatted string, but this doesn't seem to have any effect on the resulting XML object. Is there a way to get the XML object to respect the encoding of the XML-formatted string and prevent the multi-byte characters from being mangled?

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• Ensuring unique ID attribute for elements within ScriptControl

  - by Andy West

  I'm creating a control based on ScriptControl, and I'm overriding the Render method like this: protected override void Render(HtmlTextWriter writer) { RenderBeginTag(writer); writer.RenderBeginTag(HtmlTextWriterTag.Div); writer.Write("This is a test."); writer.RenderEndTag(); RenderEndTag(writer); } My question is, what if I want to assign the div an ID attribute and have it be unique on the page, even if there are mulitple instances of my control? I've seen other people's code that does this: writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ID + "_divTest"); That will prevent naming conflicts between instances of my control, but what if I've already created a div elsewhere on the page that coincidentally has the same ID? I've also heard about implementing INamingContainer. Would that apply here? How could I use it?

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• Flash receives mouse events under an HTML element when opacity set

  - by Török Gábor

  I have an HTML document with a Flash object and an absolutely positioned HTML element above it. If I set the HTML element's opacity CSS property to any value less than 1, the Flash object (that is actually covered) receives mouse events. This problem cannot be reproduced with pure HTML elements. Furthermore, Flash only receives hover events, so I cannot click below the layer. I put a demonstration of the problem online. I get this behavior in Firefox 3.6, Safari 4.0 and Chrome 5.0 in both Mac and Windows. Flash plugin version 10 is installed. Is it a bug or the the normal and expected behavior? If the latter, then how can I prevent Flash receiving events when it is covered with a translucent layer?

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• Best Practise for Stopwatch in multi processors machine?

  - by Ahmed Said

  I found a good question for measuring function performance, and the answers recommend to use Stopwatch as follows Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed But is this valid if you are running under multi processors machine? the thread can be switched to another processor, can it? Also the same thing should be in Enviroment.TickCount. If the answer is yes should I wrap my code inside BeginThreadAffinity as follows Thread.BeginThreadAffinity(); Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed Thread.EndThreadAffinity(); P.S The switching can occur over the thread level not only the processor level, for example if the function is running in another thread so the system can switch it to another processor, if that happens, will the Stopwatch be valid after this switching? I am not using Stopwatch for perfromance measurement only but also to simulate timer function using Thread.Sleep (to prevent call overlapping)

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• UISearchbar clearButton forces the keyboard to appear

  - by DASKAjA

  I have a UISearchBar which acts as a live filter for a table view. When the keyboard is dismissed via endEditing:, the query text and the gray circular "clear" button remain. From here, if I tap the gray "clear" button the keyboard reappears as the text is cleared. How do I prevent this? If the keyboard is not currently open I want that button to clear the text without reopening the keyboard. There is a protocol method that gets called when I tap the clear button. But sending the UISearchBar a resignFirstResponder message doesn't have any effect on the keyboard.

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• Is there a way to read what NSLog is writing from within the app?

  - by Jared P

  I have already tried stderr = stdout = fopen("/Users/Jared/Desktop/Untitled.txt", "w"); just as a test (obvi not production code) and this works fine for printf and some errors, but fails to redirect NSLog. I would like to be able to read what is being sent to NSLog as a string, and preferably prevent it from actually going into the system logs, although I don't particularly care if it has to. I need it to redirect logging from both my own code and apple's frameworks, which is why I can't just write a function that would append logs to a string. Thanks

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• Cross Domain Scripting Issues & JSONP

  - by DaveDev

  Our Client requires that we supply Widgits for their site. They want to link to us to get Html & the jQuery required to manipulate the Html and do asynchronous requests. I understand that there are cross-domain security limitations that would prevent this from being a possibility, but that some of those limitations are aleviated by using JSONP as the data transfer format. I'm finding it difficult in finding an explanation of what's possible in the context of what I'm trying to achieve. Could somebody please fill me in?

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• How do you unit test web page authorization using ASP.NET MVC?

  - by Kevin Pang

  Let's say you have a profile page that can only be accessed by the owner of that profile. This profile page is located at: User/Profile/{userID} Now, I imagine in order to prevent access to this page by other users, you could structure your UserController class's Profile function to check the current session's identity: HttpContext.Current.User.Identity.Name If the id matches the one in the url, then you proceed. Otherwise you redirect to some sort of error page. My question is how do you unit test something like this? I'm guessing that you need to use some sort of dependency injection instead of the HttpContext in the controller to do the check on, but I am unclear what the best way to do that is. Any advice would be helpful.

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• Setting AcceptButton to None still closes the form on ENTER.

  - by Vilx-

  I have a MDI windows forms application and my child forms mostly have "OK" and "Cancel" buttons. However I do not want them to be activated with ENTER/ESC keys to prevent accidental saves/aborts. So, the form has both AcceptButton and CancelButton set to none. The ESC button indeed does nothing, but the ENTER button still closes the form by "clicking" on the first button found, sorted by TabOrder. Why is this so? Must I really start doing workarounds and catching the ENTER key?

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• sending email with PHP (preventing from being placed in spam folder)

  - by Rees

  hello, i am trying to send email using PHP scripts... however, the recipient is receiving it in his/her SPAM folder -this is not the desired result (I would like to have it sent directly to their inbox so that I don't have to warn them to look in their SPAM folder). below is the code I use to send the email using PEAR... what changes can I make to prevent the emails from going into the SPAM folder? $mail = Mail::factory("mail"); $headers["From"] = "[email protected]"; $headers["To"] = "[email protected]"; $headers["Subject"] = "Activation"; $body = "This is a test!"; $mail->send("[email protected]", $headers, $body); ?

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• My OpenGL game switches Aero DWM Glass off.

  - by marc40000

  Hi ! I wrote a free game a few years ago: http://www.walkover.org. For the lobby and menus, it uses normal dialogs like win32. When the actual game starts it uses OpenGL. Now, on Windows 7, when the actual game starts, it switches windows aero glass off and switches it back on when the game is over. Is there something I can do to prevent this from happening? Some special flags that keep the glass on if it is on? (For newer, I have been using DirectX and this doesn#t happen there.) Maybe some (new) flag I have to specify somewhere? Thx Marc

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• Core Data Image Won't Load Into NSTableView Image Cell

  - by jcady

  In my code I am storing an image into my Core Data model (works fine). If I set up my view to have an NSImageView and bind its Data to Controller Key: selection and modelKeyPath: myImagePath, it works. It will show each image for the selected row. I then create a new column in my NSTableView and drag an image cell onto the column. However, I cannot get my Core Data bindings to have the image show up in the cell. I have tried binding both value and data, but no luck. Since I am sure the image is stored properly, what am I doing wrong in my binding to prevent the image from showing up in the table cell? Thanks so much. (My background: new Cocoa developer who has recently gone through the entire Hillegass book.)

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• How can I detect client-side when a page load is the result of an AJAX history point?

  - by Nick

  I'm trying to prevent a "flicker" effect that is occurring on my ASP.NET page which occurs when a user navigates to the page via the browser back button after having navigated away from it. The reason for the flicker is that I'm using an Update Panel which has some content in there on the initial page-load. As a result, when the page is loaded via a back button that initial content is shown very briefly before it is updated with the correct History-aware data. In order to overcome this I am intending on having the updatepanel hidden (display: none) on inital page load and then show it as long as we don't have any history to deal with. The problem is that I can't find out what to check to determine if there's any history. I can see that the Sys.Application has a _history member but when I'm checking it on page init it is null each time. Does anyone know what I should be checking to determine if there's history to deal with for a page load client-side? And at what point to do it?

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• ^M characters when using Tramp (on Windows) to connect to Ubuntu Server

  - by jamting

  I've set up Tramp on Emacs on my Windows 7 box (64 bit). For this test, this is the only thing in my emacs-config: (setq tramp-default-method "plink") Then I connect to my Ubuntu Server 9.10 running in a VM on my local network. Connection goes fine, i can use dired to browse folders and open files. Yay! However, git status shows up as: Git:master^M An when i open speedbar all folders and files ends with ^M, ie: <+ conf/^M Does anyone know how to prevent this line-ending collision from occurring?

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• How do I compile boost using __cdecl calling convention?

  - by Sorin Sbarnea

  I have a project compiled using __cdecl calling convention (msvc2010) and I compiled boost using the same compiler using the default settings. The project linked with boost but I at runtime I got an assert message like this: File: ...\boost\boost\program_options\detail\parsers.hpp Line: 79 Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention. There are the following questions: what calling convention does boost build with by default on Windows (msvc2010) how to I compile boost with __cdecl calling convention why boost wasn't able to prevent linking with code with different calling conventions? I understood that boost has really smart library auto-inclusion code.

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• Objective-C initial values of created C-array

  - by kpower

  I create an array, similar to classic C (not NSArray or one of it's children) - something like BOOL i[5];. And I want to make all its values to be equal to NO. First of all, I didn't found any information about initial values of such arrays (I know that in classic C they will be undefined, but don't know exactly about Objective-C. I found info about classes and its inner data [after allocation, without initialization], but not about simple data types). And the second, if I should set array values manually - should I use memset(...); or something different? To prevent possible questions... I want to use this construction as array of temporary boolean flags and don't think that it is proved to use something like NSArray here.

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• Ruby email_veracity_checker getting Recipient OK for invalid emails

  - by digger69

  I was testing out email_veracity_checker from rails console and found that when I tested a google apps domain (w/ catchall), yahoo and another company domain, the smtp server always returned 250 recipient ok for invalid emails (wellformed, but bogus). It seems that these servers are always returning OK perhaps to prevent email harvesting. But it does seem to raise the question 'why even validate up-front', is this approach even valid in today's environment? Note: gmail did return 550 email account doesn't exist for invalid. related to How check if an email exist without send in Ruby? Use of email_veracity_checker send-in-ruby-use-of-email-veracity-checker I appreciate your thoughts.

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• Google Visualization legend format Jquery ui tabs

  - by Liam

  I've got an issue when using the Google Visualization api line chart with Jquery ui tabs. I've got two graphs on two tabs. The first graph, which is visible by default displays fine: the second chart on the hidden tab seems to be messing up the key: I've tried changing the options but nothing I do seems to make any difference. Here are my options: options = { 'title': title, titleTextStyle: { color: color, fontSize: 20 }, 'width': 950, 'height': 400, hAxis: { minorGridlines: { count: x } }, chartArea: { width: 880 }, legend: { position: 'bottom', textStyle: { fontSize: 10 } } }; // Instantiate and draw our chart, passing in some options. var chart = new google.visualization.LineChart(document.getElementById(divId)); chart.draw(data, options); $('#tabs').tabs(); any thoughts on what is causing this and how to prevent it?? Edit If I remove the tabs() call it displays correctly. As per answer below from @Vipul tried setting the div to a fixed width, no difference.

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• Centralized error handling in VB6.

  - by AngryHacker

  I have the following method that all the error handlers call: Public Function ToError(strClass As String, strMethod As String) As String On Error GoTo errHandle ToError = "Err " & Err.Number & _ ", Src: " & Err.Source & _ ", Dsc: " & Err.Description & _ ", Project: " & App.Title & _ ", Class: " & strClass & _ ", Method: " & strMethod & _ ", Line: " & Erl Err.Clear exitPoint: Exit Function errHandle: oLog.AddToLog "Error in ToError Method: " & Err.Description, False Resume exitPoint End Function It turns out that because I declare an error handler in this function On Error GoTo errHandle, VB6 clears the error before I am able to record it. Is there a way to prevent the 'On Error GoTo errHandle' statement from clearing the error?

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• Using transactions with ADO.NET Data Adapters.

  - by Ergwun

  Scenario: I want to let multiple (2 to 20, probably) server applications use a single database using ADO.NET. I want individual applications to be able to take ownership of sets of records in the database, hold them in memory (for speed) in DataSets, respond to client requests on the data, perform updates, and prevent other applications from updating those records until ownership has been relinquished. I'm new to ADO.NET, but it seems like this should be possible using transactions with Data Adapters (ADO.NET disconnected layer). Question part 1: Is that the right way to try and do this? Question part 2: If that is the right way, can anyone point me at any tutorials or examples of this kind of approach (in C#)? Question part 3: If I want to be able to take ownership of individual records and release them independently, am I going to need a separate transaction for each record, and by extension a separate DataAdapter and DataSet to hold each record, or is there a better way to do that? Each application will likely hold ownership of thousands of records simultaneously.

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• Core Data store corruption

  - by sehugg

  A handful of customers for my iPhone app are experiencing Core Data store corruption (I assume so, since the error is "Failed to save to data store: Operation could not be completed. (Cocoa error 259.)") Has anyone else experienced this kind of store corruption? I am worried since I aim to soon push an update which performs a schema migration, and I am worried that this will expose even more problems. I had assumed that the Core Data/SQLlite APIs use atomic operations and are immune to corruption except if the underlying filesystem experiences corruption. Is there a way to reduce/prevent corruption, or at least a good way to reproduce (I have been unsuccessful thus far).

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• How should I go about creating a point system for users like SO and yahoo answers?(PHP)

  - by ggfan

  I am creating a voting system for a Q&A site project in which if a user asks a question, he/she losses -5 points; answer a question +5, vote a question +1, etc. (kind of like SO and yahoo answers) --To create the basic arithmetic, I have a "users_points" table that relates the user_id and their total points. +---+---------+ | 1 | 100 | +---+---------+ | 2 | 54 | +---+---------+ --Basically if the users does certain task, it would + or - the points. How do I prevent users from say voting an answer up 100 times. ex: I want a user to be only able to vote once per question, etc.

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• Choose a local file w/o uploading the chosen file

  - by Austin Hyde

  I am making a simple development tool for myself using PHP on my local development server. I would like a way to have a simple file-chooser to select a file without uploading it, but just retaining the file path. This is useful, because I will be the only one using the tool, and so PHP will have access to the chosen file without having it uploaded. My first thought is to have a <input type="file"...>, but as far as I know, there's no way to prevent the upload from happening. Is there a way to do this?

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