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• Free ebook: Troubleshooting SQL Server: A Guide for the Accidental DBA

  We spend much of our working life helping solve SQL Server-related performance problems, hands-on, during consulting, or on online forums. We've seen a few weird-and-wonderful issues but, mainly, it’s the same problems and misconceptions time-and-again. This is our attempt to describe, diagnose, and solve the most common problems with SQL Server 2005, 2008, and 2008 R2. And it's free. "It really helped us isolate where we were experiencing a bottleneck"- John Q Martin, SQL Server DBA. Get started with SQL Monitor today to solve tricky performance problems - download a free trial

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• No More Boxes! Exploring the PathListBox (Silverlight TV #25)

  In this video, Adam Kinney explains what the PathListBox is and why it is so compelling. Then, he demonstrates several ways of using it in creative examples. The PathListBox is one of the newest features available in Expression Blend and Silverlight 4. It redefines how users look at lists of data as it breaks the mold of a list "box" and opens the possibilities to use any shape or path. Don't miss this episode and be sure to download Adam's sample code. Relevant links: John's Blog...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Mount Bluetooth USB in VirtualBox

  - by GoBrewers14

  I originally asked this question here Python Module PyBluez Error and have narrowed it down to basically I can't get VBox to recognize my bluetooth USB. I'm on a MAC OS X 10.9.2. I've installed VirtualBox as well as the Extension Pack and I've installed Ubuntu Desktop 10.04.4 on the VirtualBox. I've searched several Mac forums and this seems to be a common problem w/o a clear solution. Anyways, the question is how can I get VirtualBox to let Ubuntu recognize my bluetooth USB? I've checked 'Enable USB 2.0 EHCI Controller' and added my two bluetooth devices to the filters list. and when I click here to mount the USB I get this error message... Any ideas? Thanks, John

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• PHP class data implementation

  - by Bakanyaka

  I'm studying OOP PHP and have watched two tutorials that implement user login\registration system as an example. But implementation varies. Which way will be more correct one to work with data such as this? Load all data retrieved from database as array into a property called something like _data on class creation and further methods operate with this property Create separate properties for each field retrieved from database, on class creation load all data fields into respective properties and operate with that properties separately? Then let's say I want to create a method that returns a list of all users with their data. Which way is better? Method that returns just an array of userdata like this: Array([0]=>array([id] => 1, [username] => 'John', ...), [1]=>array([id] => 2, [username] => 'Jack', ...), ...) Method that creates a new instance of it's class for each user and returns an array of objects

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• 40% des propriétaires de BlackBerry échangeraient pour un iPhone et 32% pour un Nexus One, selon le

  40% des utilisateurs de BlackBerry échangeraient pour un iPhone et 32% pour un Nexus One, selon le dernier sondage de Crowd Science. Un sondage réalisé par Crowd Science montre que 40% des utilisateurs de BlackBerry sont prêts à passer à l'iPhone au prochain changement de leurs Smartphones, et 32% échangeraient pour le Nexus One. [IMG]http://djug.developpez.com/rsc/Blackberry-vs-n1-iphone.jpg[/IMG] Selon John Martin, le PDG de Crowd Science ces chiffres peut être expliqués par l'impatience des utilisateurs de BlackBerry qui n'ont pas vu leurs plateformes évoluer depuis la sortie de l'iPhone. Ce sondage montre que 33% des propriétaires d'iPhone et 16% des propriétaires de Bl...

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• OpenJDK ? Nashorn ?????????

  - by Homma

  ???? Nashorn ? OpenJDK ??????????????????Nashorn ? OpenJDK ????????????????????????????????????????????????????????????????????????????????? ????? ??? jlaskey ??? Nashorn Blog ????????????? https://blogs.oracle.com/nashorn/entry/the_vote_is_in ???????? ?? ?????????????????????????????? Jim Laskey ???????????? Nashorn ??????????? [1] ? ????????? ??: 20 ??: 0 ??: 0 ??????????????????????????????? ????????????????????????????????? -John Coomes [1] http://mail.openjdk.java.net/pipermail/announce/2012-November/000139.html

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• ???????

  - by Ada Li

  ???????????, ??????????????,??????????   ??????Effie, ????????,?????? ?Google, Baidu????,????,????????,??????,??????   ????????????:“???????, ????????????“ ? ??????????: ??msn:??????????? ??????Sean:Jialin_Rubicon:?????????96????? georgiazhao:?????????????e-visa, ????????,????????? qyjohn_:????????????????,????,???????????????????????????????? ???:???,?????????????,???????,?????   ?????????,????????,???????????,?????? ??John??????,????,???????,?????? Georgia??????,E-Visa?Google??,E-Visa?????,??24????????????,??????????SingID?SingPass.   ????????,????SingID?SingPass?????????????????????,??????chensz????,???,?????SingID?SingPass? ???E-Visa??,????????????,????????????????,?????,???????,????????,????,?????? ????????????,?????????????????,????????????????,??????????Georgia, ?chensz???????,??????????,???????,?????????,??????????????????,?????????

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• FIFA official website design and development

  - by Morron

  Hi, I'm just curious about design and development of official FIFA website. What is the programming language being used to build the site? What is the development methodology they are using? I used Firebug to look around the site.Here's sth I found: HTTP/1.1 200 OK Cache-Control: no-store, no-cache, must-revalidate, private Content-Type: text/html Server: Microsoft-IIS/7.0 x-ua-compatible: IE=EmulateIE7 Vary: Accept-Encoding Content-Length: 8320 Date: Tue, 15 Jun 2010 17:54:19 GMT Connection: keep-alive According to that, I think they use IIS 7 to run the site but I'm not sure what programming language they are using. Any comment is a drop of water in the glass.

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• How to get a reference to node in DOM tree in Google Chrome debugger console

  - by .yahoo.co.jpaqwsykcj3aulh3h1k0cy6nzs3isj

  In the Google Chrome debugger, I often want to get a reference to a node in the DOM tree. I can click the "magnifying glass" button and then click the desired element in the browser window to select the corresponding node in the DOM tree displayed in the debugger. But how can I get a reference to that node in the console? If the element has an id, document.getElementById works, but if there is no id, is there a better alternative to XPath or manual traversal of the DOM tree using children? In case XPath is the best way, is there a better way than doing something like this: var evaluator = new XPathEvaluator(); var result = evaluator.evaluate("//div", document.documentElement, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null); which is a pain to type out each time.

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• Getting started in Mac Development; No Mac.... What Do?!

  - by Andrew Bolster

  Hi folks, With all the RDF et al around King Jobs' newest glass beermat, I'm getting the feeling that its a good time to add the 'iphone/ipad developer' string to my bow. One problem (two if you count not being in a financial position to slap down $1000+ for a mac) ; I am a PC head, specifically a Linux-head, and have no regular access to a Mac platform to develop on. I cannot see any way of getting my hands on iSDK without being on a Mac, (but have been known to be wrong) How hopeless is my plight and where can I go from here?

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• How do I use texture-mapping in a simple ray tracer?

  - by fastrack20

  I am attempting to add features to a ray tracer in C++. Namely, I am trying to add texture mapping to the spheres. For simplicity, I am using an array to store the texture data. I obtained the texture data by using a hex editor and copying the correct byte values into an array in my code. This was just for my testing purposes. When the values of this array correspond to an image that is simply red, it appears to work close to what is expected except there is no shading. The bottom right of the image shows what a correct sphere should look like. This sphere's colour using one set colour, not a texture map. Another problem is that when the texture map is of something other than just one colour pixels, it turns white. My test image is a picture of water, and when it maps, it shows only one ring of bluish pixels surrounding the white colour. When this is done, it simply appears as this: Here are a few code snippets: Color getColor(const Object *object,const Ray *ray, float *t) { if (object->materialType == TEXTDIF || object->materialType == TEXTMATTE) { float distance = *t; Point pnt = ray->origin + ray->direction * distance; Point oc = object->center; Vector ve = Point(oc.x,oc.y,oc.z+1) - oc; Normalize(&ve); Vector vn = Point(oc.x,oc.y+1,oc.z) - oc; Normalize(&vn); Vector vp = pnt - oc; Normalize(&vp); double phi = acos(-vn.dot(vp)); float v = phi / M_PI; float u; float num1 = (float)acos(vp.dot(ve)); float num = (num1 /(float) sin(phi)); float theta = num /(float) (2 * M_PI); if (theta < 0 || theta == NAN) {theta = 0;} if (vn.cross(ve).dot(vp) > 0) { u = theta; } else { u = 1 - theta; } int x = (u * IMAGE_WIDTH) -1; int y = (v * IMAGE_WIDTH) -1; int p = (y * IMAGE_WIDTH + x)*3; return Color(TEXT_DATA[p+2],TEXT_DATA[p+1],TEXT_DATA[p]); } else { return object->color; } }; I call the colour code here in Trace: if (object->materialType == MATTE) return getColor(object, ray, &t); Ray shadowRay; int isInShadow = 0; shadowRay.origin.x = pHit.x + nHit.x * bias; shadowRay.origin.y = pHit.y + nHit.y * bias; shadowRay.origin.z = pHit.z + nHit.z * bias; shadowRay.direction = light->object->center - pHit; float len = shadowRay.direction.length(); Normalize(&shadowRay.direction); float LdotN = shadowRay.direction.dot(nHit); if (LdotN < 0) return 0; Color lightColor = light->object->color; for (int k = 0; k < numObjects; k++) { if (Intersect(objects[k], &shadowRay, &t) && !objects[k]->isLight) { if (objects[k]->materialType == GLASS) lightColor *= getColor(objects[k], &shadowRay, &t); // attenuate light color by glass color else isInShadow = 1; break; } } lightColor *= 1.f/(len*len); return (isInShadow) ? 0 : getColor(object, &shadowRay, &t) * lightColor * LdotN; } I left out the rest of the code as to not bog down the post, but it can be seen here. Any help is greatly appreciated. The only portion not included in the code, is where I define the texture data, which as I said, is simply taken straight from a bitmap file of the above image. Thanks.

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• How do i make my google web app searchable on google?

  - by LoudNPossiblyRight

  I have started to develop a web app on google's app engine and i wish to make the static content on the site searchable on google. For example, my app is at http://ajakimov.appspot.com/ and on it there is only some random text like 'form bell road smear sky orange fan glass key'. When i google for 'form bell road smear' for example or the title of the site for that matter , i get no results - cant find the site. Does anyone know how to make a appengine site google-able? Thanks.

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• 3D effect to distort paper

  - by donpal

  This may be a little hard to describe since I don't have a sample. I'm trying to find a math function or full 3d function in php or a similar language that can help me with the following effect: imagine if you were to take a flat sheet or paper and glue it on a glass of water. It wouldn't be flat any more. It would have a curve, and one of its sides might end up being slightly hidden. Anyone can refer me to a good library or resource on the web where such functions can be found?

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• iPhone stretchableImageWithLeftCapWidth only makes "D"s.

  - by Jill

  UIImage *aImage = [[UIImage imageNamed:@"Gray_Button.png"] stretchableImageWithLeftCapWidth:25 topCapHeight:0]; Trying to make a "glass pill button". What does "stretch" do if the image is bigger... and the button I'm trying to use it on... is smaller? Does the image 'stretch' and 'shrink'? The reason I ask... is because all my images end up look like a "D" shape. The left side is squared-off... and the right side is rounded. What would a D-shape tell you that I'm doing wrong? Too much.. or too little... "leftCap setting"? Too large an image?

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• java best way to transfer images

  - by d.raev

  I have a application that reads a PDF, transform the content to collection of TIF files, and send them to Glass Fish Server for saving. Usually there are 1-5 pages and it works nice, but when I got a input file with 100+ pages... it throws error on the transfer. Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94) Putting more resources is not a good option in my case, so I m looking for a way to optimize it somehow. I store the data in: HashMap<TifProfile, List<byte[]> Is there a better way to store or send them ? EDIT I did some tests and the final collections for PDF with 80 pages has size over 280mb (240 tiffs with different settings inside)

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• how to make shadows for transparent objects using ray tracing in C++/openGL

  - by happy face

  I'm trying to make a code that cast shadow from trasnparent objects(such as glass) for rendering in 3D I do not have a shadow map and photon mapping yet, and I wanted to know if there is a way to make shadows for transparent materials using ray tracing only. Caustics sounds very hard without photon mapping... I have implemented a simple code in C++ that only makes the shadows black (no matter if the objects are transparent or opaque) Pseudo code would be great, thnx. for(size_t i = 0;i < num; ++i) { if(state_list[i].hit && state_list[i].distance < dist_from_light[i]) { return[i] = BLACK; }

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• Background color of the main content on the html page disappears

  - by Denis

  It just makes me go mad. I can't realize what the problem is. Please have a look at the pixeli.ca/glass. There is a home page that looks good - white background of the main content and looks good. But all the other pages don't have white background so they look not the way they should look. All the pages have the same style sheet and the same layout elements taken from 960.gs framework. It's just some kind of mystery there. What I need is to make all page look like the home page - having white background. Thanks.

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• Startup params for Silverlight 4 app

  - by Number8

  Hello -- We are moving our SL3 app to SL4. First step was to open it in VS2010; it converted w/o problem. However, parameters specified for the start page are not passed along. That is, if we specify ourStartPage.aspx?Slam=Dunk&Glass=Sun in app.xaml.cs, Application_Startup(), e.InitParams is empty. How do we fix this? Thanks for any advice.... (Note that the very same startup string worked in VS2008.)

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• High quality software examples

  - by Francisco Garcia

  One of the best ways to learn about programming is reading high quality code/projects from great engineers. Which open-source projects do you think is worth looking at? I mean, that code that you can print and sit under a tree with a glass of wine and enjoy reading. If you can, also specify if the software is great to look at because its documentation, design, UML diagrams or just plain code. I believe UML is not very common within open-source projects. Is there such a thing as a project branch that polishes code and design with the sole objective to give other programmers a great example of great software?

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• Using DynamicVertexBuffer in XNA 4.0

  - by Bevin

  I read about DynamicVertexBuffer, and how it's supposed to be better for data that changes often. I have a world built up by cubes, and I need to store the cubes' vertices in this buffer to draw them to the screen. However, not all cubes have vertices (some are air, which is transparent) and not all faces of the cubes need to be drawn either (they are facing each other), so how do I keep track of what vertices are stored where in the buffer? Also, certain faces need to be drawn last, namely the ones with transparency in them (like glass or leaves), and these faces also need to be drawn in a back-to-front order to not mess up the alpha blending. If all of these vertices are stored arbitrarily in this buffer, how do I know what vertices are where? Also, the number of vertices can change, but the DynamicVertexBuffer doesn't seem very dynamic to me, since I can't change it's size at all. Do I have to recreate the buffer every time I need to add or remove faces?

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• Filtering rows withing Admin using a Queryset - Django

  - by RadiantHex

  Hi folks, I'm trying to find a way to filter down rows of objects within Django Admin, using a queryset. e.g. Person.objects.filter(Q(name='John')|Q(surname='Doe')) I'm finding quite complicated to figure out. Any ideas?

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• how send message facebook friend through graph api using Accessstoken

  - by JAMES

  Can anyone help me to send message to facebook friends using graph api. I tried $response = $facebook->call_api("/me/feed", "post", "to=john","message=You have a Test message"); It's not working. I have the accesstoken of the user in my hand.only I am confused on sending process. kindly reply

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• Using WebView setHttpAuthUsernamePassword?

  - by user246114

  Hi, I'm trying to do basic authentication to view a protected url. I want to access the protected url which looks like this: http://api.test.com/userinfo/vid?=1234 So I do the following with a WebView: mWebView.setHttpAuthUsernamePassword("api.test.com", "", "john", "password123"); mWebView.loadUrl("http://api.test.com/userinfo/vid?=1234"); but the authentication doesn't seem to work, I'm just getting an output error page. Am I using the WebView method correctly here? Thanks

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• Binding to a dictionary in Silverlight with INotifyPropertyChanged

  - by rip

  In silverlight, I can not get INotifyPropertyChanged to work like I want it to when binding to a dictionary. In the example below, the page binds to the dictionary okay but when I change the content of one of the textboxes the CustomProperties property setter is not called. The CustomProperties property setter is only called when CustomProperties is set and not when the values within it are set. I am trying to do some validation on the dictionary values and so am looking to run some code when each value within the dictionary is changed. Is there anything I can do here? C# public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); MyEntity ent = new MyEntity(); ent.CustomProperties.Add("Title", "Mr"); ent.CustomProperties.Add("FirstName", "John"); ent.CustomProperties.Add("Name", "Smith"); this.DataContext = ent; } } public class MyEntity : INotifyPropertyChanged { public event PropertyChangedEventHandler System.ComponentModel.INotifyPropertyChanged.PropertyChanged; public delegate void PropertyChangedEventHandler(object sender, System.ComponentModel.PropertyChangedEventArgs e); private Dictionary<string, object> _customProps; public Dictionary<string, object> CustomProperties { get { if (_customProps == null) { _customProps = new Dictionary<string, object>(); } return _customProps; } set { _customProps = value; if (PropertyChanged != null) { PropertyChanged(this, new PropertyChangedEventArgs("CustomProperties")); } } } } VB Partial Public Class MainPage Inherits UserControl Public Sub New() InitializeComponent() Dim ent As New MyEntity ent.CustomProperties.Add("Title", "Mr") ent.CustomProperties.Add("FirstName", "John") ent.CustomProperties.Add("Name", "Smith") Me.DataContext = ent End Sub End Class Public Class MyEntity Implements INotifyPropertyChanged Public Event PropertyChanged(ByVal sender As Object, ByVal e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged Private _customProps As Dictionary(Of String, Object) Public Property CustomProperties As Dictionary(Of String, Object) Get If _customProps Is Nothing Then _customProps = New Dictionary(Of String, Object) End If Return _customProps End Get Set(ByVal value As Dictionary(Of String, Object)) _customProps = value RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs("CustomProperties")) End Set End Property End Class Xaml <TextBox Height="23" Name="TextBox1" Text="{Binding Path=CustomProperties[Title], Mode=TwoWay}" /> <TextBox Height="23" Name="TextBox2" Text="{Binding Path=CustomProperties[FirstName], Mode=TwoWay}" /> <TextBox Height="23" Name="TextBox3" Text="{Binding Path=CustomProperties[Name], Mode=TwoWay}" />

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• Linq to List and IEnumerable issues

  - by Otaku

  I am querying an HTML file with Linq. It looks something like this: <html> <body> <div class="Players"> <div class="role">Goalies</div> <div class="name">John Smith</div> <div class="name">Shawn Xie</div> <div class="role">Right Wings</div> <div class="name">Jack Davis</div> <div class="name">Carl Yuns</div> <div class="name">Wayne Gortonia</div> <div class="role">Centers</div> <div class="name">Lutz Gaspy</div> <div class="name">John Jacobs</div> </div </html> </body> What I'm trying to do is create a list of these folks like in a list of a structure called Players: Structure Players Public Name As String Public Position As String End Structure But I've quickly found out I don't really know what I'm doing when it comes to Linq. I've got this far my my queries: Dim goalieList = From d In player.Elements _ Where d.Value = "Goalies" _ Select From g In d.ElementsAfterSelf _ Take While (g.@class <> "role") _ Select New Players With {.Position = "Goalie", _ .Name = g.Value} Dim centersList = From d In player.Elements _ Where d.Value = "Centers" _ Select From g In d.ElementsAfterSelf _ Take While (g.@class <> "role") _ Select New Players With {.Position = "Centers", _ .Name = g.Value} Which gets me down to the the players by position, but then I can't do much with this afterwards the result type is System.Collections.Generic.IEnumerable(Of System.Collections.Generic.IEnumerable(Of Player)) What I want to do is add these two results to a new list, like: Dim playersList As List(Of Players) = Nothing playersList.AddRange(centersList) playersList.AddRange(goalieList) So that I can then query the list and use it. But it kicks the error: Unable to cast object of type 'WhereSelectEnumerableIterator2[System.Xml.Linq.XElement,System.Collections.Generic.IEnumerable1[Players]]' to type 'System.Collections.Generic.IEnumerable`1[Players]' As you can see, I may really have no idea how to work with all these objects/classes. Does anyone have any insight on what I may be doing wrong and how I can resolve it? RESOLVED: The Linq query needs to return a single iEnumerable, like this: Dim goalieList = From l In _ (From d In players.Elements _ Where d.Value = "Goalies" _ Select d.ElementsAfterSelf.TakeWhile(Function(f) f.@class <> "role")) _ Select New Players With {.Position = "Goalie", .Name = l.Value} and then use goalieList.ToList

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