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• WPF: Improving Performance for Running on Older PCs

  - by Phil Sandler

  So, I'm building a WPF app and did a test deployment today, and found that it performed pretty poorly. I was surprised, as we are really not doing much in the way of visual effects or animations. I deployed on two machines: the fastest and the slowest that will need to run the application (the slowest PC has an Intel Celeron 1.80GHz with 2GB RAM). The application ran pretty well on the faster machine, but was choppy on the slower machine. And when I say "choppy", I mean the cursor jumped even just passing it over any open window of the app that had focus. I opened the Task Manager Performance window, and could see that the CPU usage jumped whenever the app had focus and the cursor was moving over it. If I gave focus to another (e.g. Excel), the CPU usage went back down after a second. This happened on both machines, but the choppiness was only noticeable on the slower machine. I had very limited time to tinker on the deployment machines, so didn't do a lot of detailed testing. The app runs fine on my development machine, but I also see the CPU spiking up to 10% there, just running the cursor over the window. I downloaded the WPF performance tool from MS and have been tinkering with it (on my dev machine). The docs say this about the "Frame Rate" metric in the Perforator tool: For applications without animation, this value should be near 0. The app is not doing any heavy animation, but the frame rate stays near 50 when the cursor is over any window. The screens I tested on have column headers in a grid that "highlight" and buttons that change color and appearance when scrolled over. Even moving the mouse on blank areas of the windows cause the same Frame rate and CPU usage (doesn't seem to be related to these minor animations). (Also, I am unable to figure out how to get anything but the two default tools--Perforator and Visual Profiler--installed into the WPF performance tool. That is probably a separate question). I also have Redgate's profiling tool, but I'm not sure if that can shed any light on rendering performance. So, I realize this is not an easy thing to troubleshoot without specifics or sample code (which I can't post). My questions are: What are some general things to look for (or avoid) in the code to improve performance? What steps can I take using the WPF performance tool to narrow down the problem? Is the PC spec listed above (Intel Celeron 1.80GHz with 2GB RAM) too slow to be running even vanilla WPF applications?

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• Under what circumstances is jQuery's document.ready() not required?

  - by Phil.Wheeler

  While John Resig's recommendation is, quite rightly, to declare all events within a jquery.document.ready() function, I know that you don't actually have to put everything in there. In fact, there are cases where it may be more appropriate to deliberately put methods outside of the ready event. But what are those cases? Obviously best practice dictates that all events are declared within the ready event, so what would best practice be for declarations outside that event?

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• Where clause in nhibernate map

  - by Phil Whittaker

  I have an Nhibernate hbm that maps a many to many relationship. For database simplicity it uses a where clause on the bag to filter the joining table. this works well until I start to test and I use the hbm file to create a database from the generated schema. The root and user tags columns aren't created. In the hbm file how do I define these two columns so they are generated in the schema?

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• Will this class cause memory leaks, and does anything need disposing of? (asp.net vb)

  - by Phil

  Here is the class to export a gridview to an excel sheet: Imports System Imports System.Data Imports System.Configuration Imports System.IO Imports System.Web Imports System.Web.Security Imports System.Web.UI Imports System.Web.UI.WebControls Imports System.Web.UI.WebControls.WebParts Imports System.Web.UI.HtmlControls Namespace ExcelExport Public NotInheritable Class GVExportUtil Private Sub New() End Sub Public Shared Sub Export(ByVal fileName As String, ByVal gv As GridView) HttpContext.Current.Response.Clear() HttpContext.Current.Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", fileName)) HttpContext.Current.Response.ContentType = "application/ms-excel" Dim sw As StringWriter = New StringWriter Dim htw As HtmlTextWriter = New HtmlTextWriter(sw) Dim table As Table = New Table table.GridLines = GridLines.Vertical If (Not (gv.HeaderRow) Is Nothing) Then GVExportUtil.PrepareControlForExport(gv.HeaderRow) table.Rows.Add(gv.HeaderRow) End If For Each row As GridViewRow In gv.Rows GVExportUtil.PrepareControlForExport(row) table.Rows.Add(row) Next If (Not (gv.FooterRow) Is Nothing) Then GVExportUtil.PrepareControlForExport(gv.FooterRow) table.Rows.Add(gv.FooterRow) End If table.RenderControl(htw) HttpContext.Current.Response.Write(sw.ToString) HttpContext.Current.Response.End() End Sub Private Shared Sub PrepareControlForExport(ByVal control As Control) Dim i As Integer = 0 Do While (i < control.Controls.Count) Dim current As Control = control.Controls(i) If (TypeOf current Is LinkButton) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, LinkButton).Text)) ElseIf (TypeOf current Is ImageButton) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, ImageButton).AlternateText)) ElseIf (TypeOf current Is HyperLink) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, HyperLink).Text)) ElseIf (TypeOf current Is DropDownList) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, DropDownList).SelectedItem.Text)) ElseIf (TypeOf current Is CheckBox) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, CheckBox).Checked)) End If If current.HasControls Then GVExportUtil.PrepareControlForExport(current) End If i = (i + 1) Loop End Sub End Class End Namespace Will this class cause memory leaks? And does anything here need to be disposed of? The code is working but I am getting the app pool falling over frequently when it is in use. Thanks.

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• jquery - deciding whether a user is "away"

  - by Phil Jackson

  hi, im doing a little test to check whether the user is "away" (unactive) or not; function away_status(){ $("#away_stat_update").everyTime(1000, function(i) { var number = Number($(this).html()); if( number == 20 ) { // set user as away alert( "user away" ); } if( number > 20 ) { $("*").mousemove(function(e){ $("#away_stat_update").html(0); var number = Number(0); // reset user to being online alert( "user back online" ); }); } $("#away_stat_update").html( number + 1 ); }); $("*").mousemove(function(e){ $("#away_stat_update").html(0); }); } away_status(); the only problem is that when the number is greater than 20 and the mouse is moved it keeps alerting "user back on line" instead of doing it just once. The number is resetting by the way.

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• jquery .add() is weird

  - by phil

  Hi folks. Why all elements turn red? I only intend to turn <p> red. <ul> <li>list item 1</li> <li>list item 2</li> <li>list item 3</li> </ul> <p>a paragraph</p> <script> $('li').add('p').css('background-color', 'red'); </script>

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• Have to click twice to submit the form

  - by phil

  Intended function: require user to select an option from the drop down menu. After user clicks submit button, validate if an option is selected. Display error message and not submit the form if user fails to select. Otherwise submit the form. Problem: After select an option, button has to be clicked twice to submit the form. I have no clue at all.. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script src="jquery-1.4.2.min.js" type="text/javascript"></script> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style> p{display: none;} </style> </head> <script> $(function(){ // language as an array var language=['Arabic','Cantonese','Chinese','English','French','German','Greek','Hebrew','Hindi','Italian','Japanese','Korean','Malay','Polish','Portuguese','Russian','Spanish','Thai','Turkish','Urdu','Vietnamese']; $('#muyu').append('<option value=0>Select</option>'); //loop through array for (i in language) //js unique statement for iterate array { $('#muyu').append($('<option>',{id:'muyu'+i,val:language[i], html:language[i]})) } $('form').submit(function(){ alert('I am being called!'); // check if submit event is triggered if ( $('#muyu').val()==0 ) {$('#muyu_error').show(); } else {$('#muyu_error').hide(); return true;} return false; }) }) </script> <form method="post" action="match.php"> I am fluent in <select name='muyu' id='muyu'></select> <p id='muyu_error'>Tell us your native language</p> <input type="submit" value="Go"> </form>

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• String to image only produces black background

  - by Phil Jackson

  Hi im really having a problem find how to fix this. $string = "foo"; $font = 4; $width = ImageFontWidth($font) * strlen($string); $height = ImageFontHeight($font); $im = @imagecreatetruecolor ($width,$height); $bg = imagecolorallocate($im, 255, 255, 255); $textcolor = imagecolorallocate($im, 0, 0, 0); imagestring($im, 5, 0, 0, $string, $textcolor); imagegif($im, 'somefile.gif', 8); imagedestroy($im); I cannot seem to change the background from black. Does anyone have any ideas?

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• Changeing scaling of Matlab Figure

  - by Phil

  Hi, I have a figure that displays 20.000 points on the x-axis. So it labels the x-axis from 0 .. 20.000. However, now I would like to scale it form 0 to 50. But when I try to do this in the plot window it just shows me the first 50 points, instead of changeing the scale. Is there any straightforward way to do that in Matlab? Many thanks for your help!

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• Having trouble hiding keyboard using invisible button which sits on top of uiscrollview

  - by phil

  I have 3 items in play... 1) UIView sits at the base of the hierarchy and contains the UIScrollview. 2) UIScrollview that is presenting a lengthy user form. 3) An invisible button on the UIScrollview that I'm using to provide "hide the keyboard" features. Notice in the code below that I'm registering to be notified when the keyboard is going to appear and again when it's going to disappear. These are working great. My problem is seemingly one of "layers". See below where I insert the button into the view atIndex:0. This causes the button to be activated and "stuffed" behind the scrollview so that when you click on it, the scrollview grabs the touch and the button is unaware. There is no way to "reach" the button and suppress the keyboard. However, if I insert atIndex:1, the button gets super imposed on top of the text entry fields and so any touch at all is acted upon by the button, which immediately suppresses the keyboard and then disappears. How do I insert the button on top of the UIScrollview but behind the UITextfields that sit there? other logistics: I have a -(void) hidekeyboard function that I have setup with the UIButtion as an IBAction(). And I have the UIButton connected to "files owner" via a ctrl-drag/drop. (Do I need both of those conventions?) This code in ViewDidLoad()... [[NSNotificationCenter defaultCenter] addObserverForName:UIKeyboardWillShowNotification object:nil queue:nil usingBlock:^(NSNotification *notification){ [self.view insertSubview:self.keyboardDismissalButton atIndex:0]; }];

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• jQuery Dropdown

  - by Phil

  I've been able to make a jQuery drop down, however, I can't make it stay expanded when one of the child links is rolled over. Code: <li> <a onmouseover="$('.dropdown-1').slideDown('medium');" href="/hosting">Why Veoloo</a> <ul class="dropdown-1"> <li onmouseout="$('.dropdown-1').slideUp('medium');"><a href="#">The Reasons (15)</a></li> <li onmouseout="$('.dropdown-1').slideUp('medium');"><a href="#">Customer Testimonials</a></li> <li onmouseout="$('.dropdown-1').slideUp('medium');"><a href="#">Our Support Scope</a></li> </ul> </li>

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• javascript to select text from web page

  - by phil swenson

  I'm trying to write a bookmarklet that grabs any selected text on a web page and sends it to my website. It should (hopefully) work in Chrome, FFX, Safari, and IE. I did a search and found a function, but it doesn't appear to work. Here is the code: <html> <body> <div onClick=getSelText()>Click</div> <div>please select me</div> </body> <script language=javascript> function getSelText(){ var txt = 'nothing'; if (window.getSelection){ txt = "1" + window.getSelection(); } else if (document.getSelection) { txt = "2" + document.getSelection(); } else if (document.selection) { txt = "3" + document.selection.createRange().text; } else return; alert("selected text = " + txt); } </script> </html> when I select the text in the div "please select me" and hit the click div, I just get "selected text = 1" thanks

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• Unable to get index from jQuery UI slider range

  - by Phil.Wheeler

  I'm having a hell of a time trying to get (what I thought was) a simple index from a collection of multiple sliders. The HTML is as follows: <div id="left-values" class="line"> <span id="l1" style="padding: 0 1.8em;">0</span> <span id="l2" style="padding: 0 1.8em;">0</span> <span id="l3" style="padding: 0 1.8em;">0</span> <span id="l4" style="padding: 0 1.8em;">0</span> <span id="l5" style="padding: 0 1.8em;">0</span> <span id="l6" style="padding: 0 1.8em;">0</span> <span id="l7" style="padding: 0 1.8em;">0</span> <span id="l8" style="padding: 0 1.8em;">0</span> </div> And the jQuery code is: // setup audiometry sliders $("#eq > span").each(function (e) { // read initial values from markup and remove that var value = parseInt($(this).text()); // var index = $(this).index; <- this didn't work. $(this).empty(); $(this).slider({ value: value, slide: function (event, ui) { //console.log($(this).attr('id')); <- neither did this. //console.log(index); $('#left-values span:first').text(ui.value); } }) }); The problem is that jQuery UI - when creating a slider - replaces the existing HTML with its own markup. This includes any ID values and, for whatever reason, I can't get the index for a given slider to surface either. So I'm running out of ideas.

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• C# dependency injection - how to you inject a dependency without source?

  - by Phil Harris

  Hi, I am trying to get started with some simple dependency injection using C# and i've run up against an issue that I can't seem to come up with an answer for. I have a class that was written by another department for which I don't have the source in my project. I wanted to inject an object of this type though a constructor using an interface, but of course, i can't change the injected objects implementation to implement the interface to achieve polymorphism when casting the object to the interface type. Every academic example I have ever seen of this technique has the classes uses classes which are declared in the project itself. How would I go about injecting my dependency without the source being available in the project? I hope that makes sense, thanks.

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• Ubuntu: Graphics freeze

  - by Phil

  We have recently updated a java application which runs on an Ubuntu PC, and are now experiencing a graphics problem that we didn't encounter before. The system is running constantly, and randomly maybe twice a month but sometimes within a few days the systems graphics will freeze, and the gnome panels are frozen. Here is an extract from the syslog; Jun 28 05:41:53 swimtag-NM10 kernel: [34802.970021] [drm:i915_hangcheck_elapsed] ERROR Hangcheck timer elapsed... GPU hung Jun 28 05:41:53 swimtag-NM10 kernel: [34802.970177] [drm:i915_do_wait_request] ERROR i915_do_wait_request returns -5 (awaiting 937626 at 937625)

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• How do I update the UI during an event using ASP.NET?

  - by Phil Hale

  I'm a bit stuck with a problem. I feel like the solution should be fairly straight forward but I'm completely out of ideas for some reason. Here's the problem. I've got a user control with a couple of buttons. Think of them as 'On' and 'Off'. When either button is clicked an async method is called. If the method is successful an event is fired. Within the event I want to update the enabled property of the two buttons so that only a single button is clickable at any one time. The problem is that any changes I make to the properties are not shown on screen because the postback is already complete. I tried wrapping the buttons in an UpdatePanel but I get an "Update method can only be called on UpdatePanel with ID 'xxxx' before Render' error. I understand why the problem occurs but I can't think of a solution. Help! Ideally what I'd like to do is simply call a method within the event that will update the UI, but I don't know if that's possible.

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• What's the best way to integrate video chat into a website?

  - by phil

  I want to make video/audio chat(both one-to-one and chatroom) available on my website through web browser, and no download required. What's the available solutions out there? And what are their pros and cons?

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• How practical to change MVC app from traditional authentication to cookieless?

  - by Phil.Wheeler

  I have an application written in MVC that uses your regular .Net Forms Authentication. There's nothing particularly new or exciting going on with it. My client has now asked that users be able to log in to the app on the same machine but in different browsers, or different tabs within the same browser. To my mind, he's asking for a scope change to have authentication moved to cookieless instead of its current design. Not having had any experience with doing this in MVC, I'm curious to know before I get started how much hurt I'm in for by trying this. Are there better ways to do it? What should I consider? Any advice appreciated.

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• C++ class initialisation containing class variable initialization

  - by Phil Hannent

  I noticed some code of a colleague today that initialized class variables in the initialization. However it was causing a warning, he says because of the order they are in. My question is why is it better to do variable initialization where it currently is and not within the curly brackets? DiagramScene::DiagramScene( int slideNo, QRectF screenRect, MainWindow* parent ) : QGraphicsScene( screenRect, parent ), myParent( parent ), slideUndoImageCurrentIndex(-1), nextGroupID(0), m_undoInProgress(false), m_deleteItemOnNextUndo(0) line(0), path(0) { /* Setup default brush for background */ scDetail->bgBrush.setStyle(Qt::SolidPattern); scDetail->bgBrush.setColor(Qt::white); setBackgroundBrush(scDetail->bgBrush); }

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• Is there a network diagram standard for illustrating web services?

  - by Phil.Wheeler

  I'm putting together a Solution Architecture document for an enhancement we're adding to our site and it occurs to me that I've never formally illustrated a web service call before. Is there a convention for how web service calls are illustrated on your garden-variety network diagram? Can anyone point me to examples or share something on Create.ly (or similar service)?

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• Idatareaders not returning values from database

  - by Phil

  In my codebehind I have this vb: Dim reader as idatareader = includes.SelectDepartmentID(PageID) While reader.Read Did = reader("departmentid") GroupingHeading = reader("heading") Folder = reader("folder") If reader("OwnBanner") Is DBNull.Value Then OwnBanner = String.Empty Else OwnBanner = reader("ownbanner") End If Then in my class I have: Public Function SelectDepartmentID(ByVal PageID As Integer) As IDataReader Dim Command As SqlCommand = db.GetSqlStringCommand("sql") db.AddInParameter(Command, "@pageid", Data.DbType.Int32, PageID) Dim reader As IDataReader = db.ExecuteReader(Command) reader.Read() Return reader End Function No Errors are being presented yet nothing is being returned by the reader. Is there an error in my code? Thanks.

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• Validate zip and display error with onBlur event

  - by phil

  Check if zip is 5 digit number, if not then display 'zip is invalid'. I want to use onBlur event to trigger the display. But it's not working. <script> $(function(){ function valid_zip() { var pat=/^[0-9]{5}$/; if ( !pat.test( $('#zip').val() ) ) {$('#zip').after('<p>zip is invalid</p>');} } }) </script> zip (US only) <input type="text" name='zip' id='zip' maxlength="5" onBlur="valid_zip()">

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• ASP.NET Ajax Error: Sys.WebForms.PageRequestManagerParserErrorException

  - by Phil Bennett

  My website has been giving me intermittent errors when trying to perform any Ajax activities. The message I get is Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near ' So its obviously some sort of server timeout or the server's just returning back mangled garbage. This generally, unfortunately not always, happens when the site has been idle for a while. Anybody else been able to overcome this? Thanks

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• Google Maps Api search json results

  - by Phil Wright

  What do I needto use to get a search listing using the google maps API? I can get one address or lat/long but I want to search for say "bars 84070" andget a list of addresses and lat/long thanks

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• EJB-like plug-in to VS2008?

  - by Phil

  I'd like to be able to just write a class and get a table generated in my DB along with all the properties of that class. In EJB it's possible to let the container handle the data and "sync" with the DB. I'd like something like this in VS2008 with C# .NET and ASP.NET. Is there anything remotely like this on the market?

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