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  • What is the best practices for checking if the user of a Python script has root-like privileges?

    - by Paul Hoffman
    I have a Python script that will be doing a lot of things that would require root-level privileges, such as moving files in /etc, installing with apt-get, and so on. I currently have: if os.geteuid() != 0: exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.") Is this the best way to do the check? Are there other best practices?

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  • Javascript Hex String to Image

    - by Gunnar Hoffman
    Hello everyone. I'll cut right to the chase. Right now I am developing a web based application. It has a PHP REST based architecture that serves up XML documents. On many of these documents attributes are hex encoded picture strings. On the client side jQuery AJAX fetches an XML document with a picture in it. I need to display said picture in some <img> tags. However my knowledge on such methods is lacking so here I am asking for help. Goal: JavaScript String variable in hex or base64 HTML displayed image. Cross browser is required, or a hack for the ones that do not support it is fine. Thanks, Gunnar

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  • Copy files in folder up one directory in python

    - by Aaron Hoffman
    I have a folder with a few files that I would like to copy one directory up (this folder also has some files that I don't want to copy). I know there is the os.chdir("..") command to move me to the directory. However, I'm not sure how to copy those files I need into this directory. Any help would be greatly appreciated.

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  • How do I make my MySQL query with joins more concise?

    - by John Hoffman
    I have a huge MySQL query that depends on JOINs. SELECT m.id, l.name as location, CONCAT(u.firstName, " ", u.lastName) AS matchee, u.email AS mEmail, u.description AS description, m.time AS meetingTime FROM matches AS m LEFT JOIN locations AS l ON locationID=l.id LEFT JOIN users AS u ON (u.id=m.user1ID) WHERE m.user2ID=2 UNION SELECT m.id, l.name as location, CONCAT(u.firstName, " ", u.lastName) AS matchee, u.email AS mEmail, u.description AS description, m.time AS meetingTime FROM matches AS m LEFT JOIN locations AS l ON locationID=l.id LEFT JOIN users AS u ON (u.id=m.user2ID) WHERE m.user1ID=2 The first 3 lines of each sub-statement divided by UNION are identical. How can I abide by the DRY principle, not repeat those three lines, and make this query more concise?

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  • Why am I getting a MySQL error?

    - by John Hoffman
    Here is my query. Its intention is allow access to properties of the animals that constitute a match of two animals. The match table contains columns for animal1ID and animal2ID to store which animals constitute the match. SELECT id, (SELECT * FROM animals WHERE animals.id=matches.animal1ID) AS animal1, (SELECT * FROM users WHERE animals.id=matches.animalID) AS animal2 FROM matches WHERE id=5 However, MySQl returns this error: Operand should contain 1 column(s). Why? Is there an alternative way to do this, perhaps with a JOIN statement?

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  • Morris.JS X-Axis Label Height

    - by Aaron
    I have a chart generated with Morris.JS but the labels on the x-axis are to long and being cut off due to the limited height of the area showing the labels. The code below would render a graph that only shows the partial label for "COUNTY PARK ROAD ELEM.". How can I adjust the height of the label area to show the entire text? The code is as follow if ($('#IP1').length){ Morris.Bar({ element: 'IP1', data: [ {x: 'COUNTY PARK ROAD ELEM.', yIndex: 376.92} ], xkey: 'x', ykeys: ['yIndex'], labels: ['Index Points'], ymax: 500, barRatio: 0.2, xLabelAngle: 45, hideHover: 'auto' }); }

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  • Retrieve Radgrid DetailTable Items from Selected Item in JavaScript

    - by Aaron M
    I am trying to retrieve all of the children items in a detailtable of an item. I can get the item, but I am having no luck in trying to get the children items. Here is the relevant code that I have so far var MasterTable = radgrid.get_masterTableView(); var selectedRows = MasterTable.get_selectedItems(); for (i = 0; i < selectedRows.length; i++) { var row = selectedRows[i]; }

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  • Sending Client Certificate in HttpWebRequest

    - by Aaron Fischer
    I am trying to pass a client certificate to a server using the code below however I still revive the HTTP Error 403.7 - Forbidden: SSL client certificate is required. What are the possible reasons the HttpWebRequest would not send the client certificate? var clientCertificate = new X509Certificate2( @"C:\Development\TestClient.pfx", "bob" ); HttpWebRequest tRequest = ( HttpWebRequest )WebRequest.Create( "https://ofxtest.com/ofxr.dll" ); tRequest.ClientCertificates.Add( clientCertificate ); tRequest.PreAuthenticate = true; tRequest.KeepAlive = true; tRequest.Credentials = CredentialCache.DefaultCredentials; tRequest.Method = "POST"; var encoder = new ASCIIEncoding(); var requestData = encoder.GetBytes( "<OFX></OFX>" ); tRequest.GetRequestStream().Write( requestData, 0, requestData.Length ); tRequest.GetRequestStream().Close(); ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback( CertPolicy.ValidateServerCertificate ); WriteResponse( tRequest.GetResponse() );

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  • C# WebBrowser Control System.AccessViolationException

    - by Aaron Smith
    I have a program that uses the built in webbrowser control. At some point during the usage of this, I'm not sure at what point, but it appears to be random, I get the following error: System.AccessViolationException FullText = System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) Does anyone have any clues as to why I would get this and how to prevent it?

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  • C Sharp -- PInvokeStackImbalance detected on a well documented function?

    - by Aaron Hammond
    Here is my code for a ClickMouse() function: [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)] public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo); private const long MOUSEEVENTF_LEFTDOWN = 0x02; private const long MOUSEEVENTF_LEFTUP = 0x04; private const long MOUSEEVENTF_RIGHTDOWN = 0x08; private const long MOUSEEVENTF_RIGHTUP = 0x10; private void ClickMouse() { long X = Cursor.Position.X; long Y = Cursor.Position.Y; mouse_event(MOUSEEVENTF_LEFTDOWN | MOUSEEVENTF_LEFTUP, X, Y, 0, 0); } For some reason, when my program comes to this code, it throws this error message: PInvokeStackImbalance was detected Message: A call to PInvoke function 'WindowsFormsApplication1!WindowsFormsApplication1.Form1::mouse_event' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature. Please help?

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  • Intermittent PolicyException: Execution permission cannot be acquired.

    - by Aaron Maenpaa
    We are intermittently seeing the following exception shortly after an App Pool recycle in an ASP.NET application: System.Configuration.ConfigurationErrorsException: Could not load file or assembly 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418) ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Failed to grant permission to execute. (Exception from HRESULT: 0x80131418) File name: 'Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' ---> System.Security.Policy.PolicyException: Execution permission cannot be acquired. at System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Boolean checkExecutionPermission) at System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Int32& securitySpecialFlags, Boolean checkExecutionPermission) at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) The specific DLL that fails to load varies from incident to incident, but is always one referenced by the main assembly. We're running on ASP.NET 3.5 on Windows Server 2008. This seems to happen in batches affecting some but not all of sites on the same App Pool. We have a large number of sites all running the same code. Once a site has failed to load a DLL it throws up a Yellow Screen of Death until the next App Pool recycle. We haven't been able to reproduce this behavior and the sites seem to work fine for days or weeks at a time (and many App Pool recycles) before failing. Has anybody else seen similar behavior? Update: We've tried reproducing the failure by setting up a few hundred sites and writing a script to hit them repeatedly while recycling the App Pool once every couple of minutes and were unable to accomplish much other than loading down the server's CPU for a few days straight. We then tried messing (locking one of the DLLs, changing the file permissions) with the copies of the DLLs that ASP.NET makes and managed to reproduce similar behavior but not the same exception. Does anybody have any ideas on how to adjust the security policy to get it to throw a System.Security.Policy.PolicyException: Execution permission cannot be acquired. when loading a specific DLL?

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  • Resizing QT's QTextEdit to Match Text Height: maximumViewportSize()

    - by Aaron
    I am trying to use a QTextEdit widget inside of a form containing several QT widgets. The form itself sits inside a QScrollArea that is the central widget for a window. My intent is that any necessary scrolling will take place in the main QScrollArea (rather than inside any widgets), and any widgets inside will automatically resize their height to hold their contents. I have tried to implement the automatic resizing of height with a QTextEdit, but have run into an odd issue. I created a sub-class of QTextEdit and reimplemented sizeHint() like this: QSize OperationEditor::sizeHint() const { QSize sizehint = QTextBrowser::sizeHint(); sizehint.setHeight(this->fitted_height); return sizehint; } this-fitted_height is kept up-to-date via this slot that is wired to the QTextEdit's "contentsChanged()" signal: void OperationEditor::fitHeightToDocument() { this->document()->setTextWidth(this->viewport()->width()); QSize document_size(this->document()->size().toSize()); this->fitted_height = document_size.height(); this->updateGeometry(); } The size policy of the QTextEdit sub-class is: this->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred); I took this approach after reading this post. Here is my problem: As the QTextEdit gradually resizes to fill the window, it stops getting larger and starts scrolling within the QTextEdit, no matter what height is returned from sizeHint(). If I initially have sizeHint() return some large constant number, then the QTextEdit is very big and is contained nicely within the outer QScrollArea, as one would expect. However, if sizeHint gradually adjusts the size of the QTextEdit rather than just making it really big to start, then it tops out when it fills the current window and starts scrolling instead of growing. I have traced this problem to be that, no matter what my sizeHint() returns, it will never resize the QTextEdit larger than the value returned from maximumViewportSize(), which is inherited from QAbstractScrollArea. Note that this is not the same number as viewport()-maximumSize(). I am unable to figure out how to set that value. Looking at QT's source code, maximumViewportSize() is returning "the size of the viewport as if the scroll bars had no valid scrolling range." This value is basically computed as the current size of the widget minus (2 * frameWidth + margins) plus any scrollbar widths/heights. This does not make a lot of sense to me, and it's not clear to me why that number would be used anywhere in a way that supercede's the sub-class's sizeHint() implementation. Also, it does seem odd that the single "frameWidth" integer is used in computing both the width and the height. Can anyone please shed some light on this? I suspect that my poor understanding of QT's layout engine is to blame here.

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  • javascript - multiple dependent/cascading/chained select boxes on same form

    - by Aaron
    I'm populating select box options via jquery and json but I'm not sure how to address multiple instances of the same chained select boxes within my form. Because the select boxes are only rendered when needed some records will have ten sets of chained select boxes and others will only need one. How does one generate unique selects to support the auto population of secondary select options? Here's the code I'm using, and I thank you in advance for any insight you may provide. <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript"> function populateACD() { $.getJSON('/acd/acd2json.php', {acdSelect:$('#acdSelect').val()}, function(data) { var select = $('#acd2'); var options = select.attr('options'); $('option', select).remove(); $.each(data, function(index, array) { options[options.length] = new Option(array['ACD2']); }); }); } $(document).ready(function() { populateACD(); $('#acdSelect').change(function() { populateACD(); }); }); </script> <?php require_once('connectvars.php'); $dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME); $squery = "SELECT ACD1ID, ACD1 from ACD1"; $sdata = mysqli_query($dbc, $squery); // Loop through the array of ACD1s, placing them into an option of a select echo '<select name="acdSelect" id="acdSelect">'; while ($row = mysqli_fetch_array($sdata)) { echo "<option value=" . $row['ACD1ID'] . ">" . $row['ACD1'] . "</option>\n"; } echo '</select><br /><br />'; <select name="acd2" id="acd2"> </select> acd2json.php <?php $dsn = "mysql:host=localhost;dbname=wfn"; $user = "acd"; $pass = "***************"; $pdo = new PDO($dsn, $user, $pass); $rows = array(); if(isset($_GET['acdSelect'])) { $stmt = $pdo->prepare("SELECT ACD2 FROM ACD2 WHERE ACD1ID = ? ORDER BY ACD2"); $stmt->execute(array($_GET['acdSelect'])); $rows = $stmt->fetchAll(PDO::FETCH_ASSOC); } echo json_encode($rows); ?>

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  • iPhone App › Add voice recognition?

    - by aaron
    I'd like to build an app that uses voice recognition. I've seen big companies like Google etc implement this feature, but I'm curious about doing it on a start-up level. Anyone looked into this? Are there any tools out there for us to do this?

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  • script running very slow in IE with Jquery quickflip plug-in

    - by Aaron Carlino
    I have a jQuery plugin running on my site that is executing very, very slowly in IE7/8 to the point that it throws a slow script warning to the user. It doesn't happen in any other browser, and I can't figure out what might be going on. If you go to this page: http://dev.xeetic.org/projects You'll see that there are 16 results on each page, and each one has a "flip" behavior attached, using the jQuery plugin "quickflip." Attaching this behavior is very slow in IE. If I reduce the result set to 8 or 4 per page, it's faster, but still very bogged down. I have contacted the author of the script with no success. I am willing to pay for a solution, if I'm allowed to offer such a thing on this site.

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  • How to refactor large projects in visual studio

    - by Aaron
    I always run into a problem where my projects in Visual Studio (2008) become huge monstrosities and everything is generally thrown into a Web Application project. I know from checking out some open source stuff that they tend to have multiple projects within a solution, each with their own responsibilities. Does anyone have any advice for how to refactor this out? What should be in a separate project vs. part of the web project? Can you point me to any reference materials on the subject, or is it just something you become accustomed to with time?

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  • jQuery Cycle plugin IE6/7 issues

    - by Aaron Moodie
    I've implemented a slideshow using the Cycle plugin, which is working in all browsers except IE6&7, where the images just show up in a list, and the #page_copy div is not hiding. I've been going through the code all day without any luck, and not exactly sure how or what I should be looking for. What would be the best way to go about debugging this issue? I know that the #page_copy div is hiding when I remove the rest of the code, and I've tried the reverse (which had no result) <script type="text/javascript" charset="utf-8"> jQuery.fn.fadeToggle = function(speed, easing, callback) { return this.animate({opacity: 'toggle'}, speed, easing, callback); }; $(document).ready(function() { $('#page_copy').hide(); $('a#info_close_button').click(function() { $('#page_copy').fadeOut(200); return false; }); $('a#info_button').click(function() { $('#page_copy').fadeToggle(200); return false; }); }); $(window).load(function() { // vertically center single image var $image_cnt = $("#images > img").size(); if($image_cnt < 2) { var $single_img = $("#images").children(':first-child'); var h = $single_img.height(); $single_img.css({ marginTop: (620 - h) / 2, }); $(".next").css("display","none"); $(".prev").css("display","none"); } }); // wait until images have loaded before starting cycle $(window).load(function() { // front image rotator $('#images').cycle({ fx: 'fade', speed: 300, next: '.next', prev: '.prev', containerResize: 0, timeout: 0, delay: -2000, before: onBefore }); }); // hide all but the first image when page loads $(document).ready(function() { $('#images img:gt(0)').hide(); }); // callback fired when each slide transition begins function onBefore(curr,next,opts) { var $slide = $(next); var w = $slide.width(); var h = $slide.height(); $slide.css({ marginTop: (620 - h) / 2, marginLeft: (650 - w) / 2 }); }; </script>

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  • Struts2 - How to use the Struts2 Annotations?

    - by Aaron
    I'm trying to implement the Struts 2 Annotations in my project, but I don't know how. I added the convention-plugin v 2.1.8.1 to my pom I modified the web.xml ... <init-param> <param-name>actionPackages</param-name> <param-value>org.apache.struts.helloworld.action</param-value> </init-param> ... My Action package org.apache.struts.helloworld.action; import org.apache.struts.helloworld.model.MessageStore; import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; @Results({ @Result(name="success", location="HelloWorld.jsp") }) public class HelloWorld extends ActionSupport { public String execute() throws Exception { messageStore = new MessageStore() ; return SUCCESS; } The jsp page from where I'm trying to use my action. <body> <h1>Welcome To Struts 2!</h1> <p><a href="<s:url action='helloWorld'/>">Hello World</a></p> </body> When I press the link associated to the action helloWorld, but it's sends me to the exactly the same page. So, from index.jsp, it's sends to index.jsp. The way it should behave: it should send me to HelloWorld.jsp. I uploaded the project (a very simple HelloWorld app) to FileFront, maybe someone sees where is the problem. http://www.filefront.com/16364385/Hello_World.zip

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  • JavaBeans and DSLs

    - by Aaron Digulla
    It's 2009 and we still all hold on the JavaBeans despite all their flaws, mostly because of the tooling support which we wrote in our own blood. But now we have method chaining and internal DSLs and some pressure to replace or extend JavaBeans with DSL classes. Has anyone an implementation that implements PropertyDescriptor for a DSL (where the getters and setter use the exact same name as the property) and a way to hook that into the Java RT so I don't need to create them all by myself?

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  • Twitter Bootstrap 3 top nav dropdown covered by subnav bar

    - by Aaron Qian
    I'm creating a Twitter Bootstrap main nav and sub nav with a drop down menu on the main nav. The problem is that I can never get the drop down menu to be shown above the sub nav. Here is the HTML: <div class="mainnav navbar navbar-fixed-top navbar-inverse"> <div class="navbar-inner"> <div class="container"> <ul class="nav"> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown"> Settings </a> <ul class="dropdown-menu"> <li><a>test 1</a></li> <li><a>test 2</a></li> </ul> </li> </ul> </div> </div> </div> <div class="subnav navbar navbar-fixed-top"> <div class="navbar-inner"> <div class="container"> <ul class="nav"> <li><a>foo</a></li> <li><a>bar</a></li> </ul> </div> </div> </div> CSS: .subnav { top: 40px; } .mainnav .dropdown-menu { // how can I show this menu above the subnav??? }

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  • Arrrg! MovieClip object refuses to moved in any rational way in as3?

    - by Aaron H.
    I have a MovieClip object, which is exported for actionscript (AS3) in an .swc file. When I place an instance of the clip on the stage without any modifications, it appears in the upper left corner, about half off stage (i.e. only the lower right quadrant of the object is visible). I understand that this is because the clip has a registration point which is not the upper left corner. If you call getBounds() on the movieclip you can get the bounds of the clip (presumably from the "point" that it's aligned on) which looks something like (left: -303, top: -100, right: 303, bottom: 100), you can subtract the left and top values from the clip x and y: clip.x -= bounds.left; clip.y -= bounds.top; This seems to properly align the clip fully on stage with the top left of the clip squarely in the corner of the stage. But! Following that logic doesn't seem to work when aligning it on the center of the stage! clip.x = (stage.stageWidth / 2); etc... This creates the crazy parallel universe where the clip is now down in the lower right corner of the stage. The only clue I have is that looking at: clip.transform.matrix and clip.transform.concatenatedMatrix matrix has a tx value of 748 (half of stage height) ty value of 426 (Half of stage height) concatenatedMatrix has a tx value of 1699.5 and ty value of 967.75 That's also obviously where the movieclip is getting positioned, but why? Where is this additional translation coming from?

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  • Interface member name conflicts in ActionScript 3

    - by Aaron
    I am trying to create an ActionScript 3 class that implements two interfaces. The interfaces contain member functions with different signatures but the same name: public interface IFoo { function doStuff(input:int):void; } public interface IBar { function doStuff(input1:String, input2:Number):void; } public class FooBar implements IFoo, IBar { // ??? } In C# this problem can be solved with explicit interface implementations, but as far as I can tell ActionScript does not have that feature. Is there any way to create a class that implements both interfaces?

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