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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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  • Static Typing and Writing a Simple Matrix Library

    - by duckworthd
    Aye it's been done a million times before, but damnit I want to do it again. I'm writing a simple Matrix Library for C++ with the intention of doing it right. I've come across something that's fairly obvious in mathematics, but not so obvious to a strongly typed system -- the fact that a 1x1 matrix is just a number. To avoid this, I started walking down the hairy path of matrices as a composition of vectors, but also stumbled upon the fact that two vectors multiplied together could either be a number or a dyad, depending on the orientation of the two. My question is, what is the right way to deal with this situation in a strongly typed language like C++ or Java?

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  • WCF using REST, having some binding questions

    - by netlogging
    Hello people, I am really confused right now and I can't get any right answers anywhere. My confusions are: 1) Isn't wsHttpBinging (which is beefed up basicHttpBinding) used in SOAP instead of REST and REST only uses webHttpBinding? 2) Also, DOES silverlight 4 with WCF (REST) support wsHttpBinding (VS2010)? I read that it does not everywhere on the net but I some how got silverlight 4 working with REST using wsHttpBinding. NOTE: I am using Factory="System.ServiceModel.Activation.WebServiceHostFactory". Is this factory setting somehow bypassing my web.config setting for wsHttpBinding to make it work with webHttpBinding and i am thinking by my wsHttpBinding is working? Thank you.

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  • physics game programming box2d - orientating a turret-like object using torques

    - by egarcia
    This is a problem I hit when trying to implement a game using the LÖVE engine, which covers box2d with Lua scripting. The objective is simple: A turret-like object (seen from the top, on a 2D environment) needs to orientate itself so it points to a target. The turret is on the x,y coordinates, and the target is on tx, ty. We can consider that x,y are fixed, but tx, ty tend to vary from one instant to the other (i.e. they would be the mouse cursor). The turret has a rotor that can apply a rotational force (torque) on any given moment, clockwise or counter-clockwise. The magnitude of that force has an upper limit called maxTorque. The turret also has certain rotational inertia, which acts for angular movement the same way mass acts for linear movement. There's no friction of any kind, so the turret will keep spinning if it has an angular velocity. The turret has a small AI function that re-evaluates its orientation to verify that it points to the right direction, and activates the rotator. This happens every dt (~60 times per second). It looks like this right now: function Turret:update(dt) local x,y = self:getPositon() local tx,ty = self:getTarget() local maxTorque = self:getMaxTorque() -- max force of the turret rotor local inertia = self:getInertia() -- the rotational inertia local w = self:getAngularVelocity() -- current angular velocity of the turret local angle = self:getAngle() -- the angle the turret is facing currently -- the angle of the like that links the turret center with the target local targetAngle = math.atan2(oy-y,ox-x) local differenceAngle = _normalizeAngle(targetAngle - angle) if(differenceAngle <= math.pi) then -- counter-clockwise is the shortest path self:applyTorque(maxTorque) else -- clockwise is the shortest path self:applyTorque(-maxTorque) end end ... it fails. Let me explain with two illustrative situations: The turret "oscillates" around the targetAngle. If the target is "right behind the turret, just a little clock-wise", the turret will start applying clockwise torques, and keep applying them until the instant in which it surpasses the target angle. At that moment it will start applying torques on the opposite direction. But it will have gained a significant angular velocity, so it will keep going clockwise for some time... until the target will be "just behind, but a bit counter-clockwise". And it will start again. So the turret will oscillate or even go in round circles. I think that my turret should start applying torques in the "opposite direction of the shortest path" before it reaches the target angle (like a car braking before stopping). Intuitively, I think the turret should "start applying torques on the opposite direction of the shortest path when it is about half-way to the target objective". My intuition tells me that it has something to do with the angular velocity. And then there's the fact that the target is mobile - I don't know if I should take that into account somehow or just ignore it. How do I calculate when the turret must "start braking"?

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  • Delay keyboard input help

    - by Stradigos
    I'm so close! I'm using the XNA Game State Management example found here and trying to modify how it handles input so I can delay the key/create an input buffer. In GameplayScreen.cs I've declared a double called elapsedTime and set it equal to 0. In the HandleInput method I've changed the Key.Right button press to: if (keyboardState.IsKeyDown(Keys.Left)) movement.X -= 50; if (keyboardState.IsKeyDown(Keys.Right)) { elapsedTime -= gameTime.ElapsedGameTime.TotalMilliseconds; if (elapsedTime <= 0) { movement.X += 50; elapsedTime = 10; } } else { elapsedTime = 0; } The pseudo code: If the right arrow key is not pressed set elapsedTime to 0. If it is pressed, the elapsedTime equals itself minus the milliseconds since the last frame. If the difference then equals 0 or less, move the object 50, and then set the elapsedTime to 10 (the delay). If the key is being held down elapsedTime should never be set to 0 via the else. Instead, after elapsedTime is set to 10 after a successful check, the elapsedTime should get lower and lower because it's being subtracted by the TotalMilliseconds. When that reaches 0, it successfully passes the check again and moves the object once more. The problem is, it moves the object once per press but doesn't work if you hold it down. Can anyone offer any sort of tip/example/bit of knowledge towards this? Thanks in advance, it's been driving me nuts. In theory I thought this would for sure work. CLARIFICATION Think of a grid when your thinking about how I want the block to move. Instead of just fluidly moving across the screen, it's moving by it's width (sorta jumping) to the next position. If I hold down the key, it races across the screen. I want to slow this whole process down so that holding the key creates an X millisecond delay between it 'jumping'/moving by it's width. EDIT: Turns out gameTime.ElapsedGameTime.TotalMilliseconds is returning 0... all of the time. I have no idea why.

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  • Outlook style events calendar for project based on MVC framework

    - by Roman
    I need large Calendar (not jQuery datepicker) with possibility to schedule events and show them on calendar. Calendar must support month/week/day views. It is very desirable for Calendar not to reload whole page when view changes (AJAX refresh). It must be easily customizable (CSS themes) and localizable. It should support drag & drop (for scheduled events). Such Calendar must be rendered on client side from JSON data snippet. I know there are too many requirements to find Calendar that matches them all but all they are important. I have found some free open source Calendar controls, but almost all are tightly tuned for ASP.NET but not MVC or have very "heavy" JavaScript codebase. Ideally i see it as jQuery extension but not server side ASP.NET control. The best ready-to-use solution I have found is FullCalendar by Adam Shaw (http://arshaw.com/fullcalendar/). It is jQuery plugin which source code I can change to fit my needs. If you can suggest some better existing solutions I'll be very appreciative.

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  • DateJS parsing mystery

    - by Herb Caudill
    I'm using DateJS to parse user-inputted dates, and getting some strange results. Date.parse("15 Jan 2010") returns Fri Jan 15 00:00:00 EST 2010 (right) Date.parse("15-Apr-2010") returns Thu Apr 15 00:00:00 EDT 2010 (right) Date.parse("15 Apr 2010") returns Thu Apr 1 00:00:00 EDT 2010 (wrong) As far as I can tell, the d MMM yyyy input format works fine for every month except April and August; in those two cases, it returns the first of the month no matter what day is entered. Is this a bug, or is there a logical explanation I'm missing?

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  • Installing JavaFX 2.0 in Eclipse Juno for Mac

    - by Josh
    I'm running Mac OS X 10.6.x (Snow Leopard) right now, so I'm pretty sure that there could be some issues with supported systems, but I'm trying to install JavaFX 2.0 (or 2.1.x) in Eclipse Juno for Java EE (version 3.8). I have already installed the e(fx)clipse plugin, but I'm not sure if I'm downloading the right JavaFX .zip file from the Oracle website. I downloaded the JavaFX 2.2 beta release because it seemed to be the only release available for OS X, but I could be wrong. Once I download this archive, I'm not exactly what to do with it/where to place it so that Eclipse recognizes it as the JavaFX 2.2 SDK. I know that I have to go into preferences and set the location of the SDK file, but there doesn't seem to be any selectable .jar file or folder to set it to. Am I doing something wrong here? Any help is appreciated. Edit: I worked around the issue by setting the SDK location to the location of the downloaded JavaFX 2.2 SDK in the JavaFX section in the preferences tree.

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  • Background selector declaration in CSS

    - by Shivanand
    Hello, In CSS declaration for a selector is given as: background-attachment: scroll; background-color: transparent; background-image: url(/images/ucc/green/btn-part2.gif); background-repeat: no-repeat; background-position: right top; I want to optimize the code and change it to: background: scroll transparent url(/images/ucc/green/btn-part2.gif) no-repeat right top; My question is, Is this correct way and does it work in IE7/8, Firefox, Safari?

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  • JS settimeout doesn’t work in IE8…

    - by Nagesh
    <html> <head> <script> var i; i = 0; function loop() { i = i + 1; alert(String(i)); setTimeout("loop()",1000); } setTimeout("loop()",1000); </script> </head> <body> </body> </html> Please try the above code in IE8 it will not give alert message for every 1 sec if you hold right click. But in firefox it will give alert message even though if you dont release the right click. I want the firefox functionality in IE8.

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  • php adding images to another image, exact positioning

    - by user271619
    I have a cool snippet of code that works well, except one thing. The code will take an icon I want to add to an existing picture. I can position it where I want too! Which is exactly what I need to do. However, I'm stuck on one thing, concerning the placement. The code "starting position" (on the main image: navIcons.png) is from the Bottom Right. I have 2 variables: $move_left = 10; & $move_up = 8;. So, the means I can position the icon.png 10px left, and 8px up, from the bottom right corner. I really really want to start the positioning from the Top Left of the image, so I'm really moving the icon 10px right & 8px down, from the top left position of the main image. Can someone look at my code and see if I'm just missing something that inverts that starting position? function attachIcon($imgname) { $mark = imagecreatefrompng($imgname); imagesavealpha($mark, true); list($icon_width, $icon_height) = getimagesize($imgname); $img = imagecreatefrompng('images/sprites/navIcons.png'); imagesavealpha($img, true); $move_left = 10; $move_up = 9; list($mainpic_width, $mainpic_height) = getimagesize('images/sprites/navIcons.png'); imagecopy($img, $mark, $mainpic_width-$icon_width-$move_left, $mainpic_height-$icon_height-$move_up, 0, 0, $icon_width, $icon_height); imagepng($img); // display the image + positioned icon in the browser //imagepng($img,'newnavIcon.png'); // rewrite the image with icon attached. } header('Content-Type: image/png'); attachIcon('icon.png'); ? For those who are wondering why I'd even bother doing this. In a nutshell, I like to add 16x16 icons to 1 single image, while using css to display that individual icon. This does involve me downloading the image (sprite) and open photoshop, add the new icon (positioning it), and reuploading it to the server. Not a massive ordeal, but just having fun with php.

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  • iPhone tilt direction

    - by Tate Allen
    Hi all, I am making a simple, tilt controlled game using UIKit. So far, when I tilt the device the character moves in the appropriate direction. What I want him to do is to change the direction he is facing when I tilt the device. For example, when I tilt it left, I want the character to face left. Is there a way to detect whether the device was tilted left or right? If so, could you point me in the right direction please. Thanks, Tate

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  • Exceptions & Interrupts

    - by Betamoo
    When I was searching for a distinction between Exceptions and Interrupts, I found this question Interrupts and exceptions on SO... Some answers there were not suitable (at least for assembly level): "Exception are software-version of an interrupt" But there exist software interrupts!! "Interrupts are asynchronous but exceptions are synchronous" Is that right? "Interrupts occur regularly" "Interrupts are hardware implemented trap, exceptions are software implemented" Same as above! I need to find if some of these answers were right , also I would be grateful if anyone could provide a better answer... Thanks!

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  • HTML overlay height to cover entire visible page

    - by Evgeny
    I have a web page that loads some stuff using AJAX. I want to display an overlay with a loading indicator while the loading is in progress, so that the user cannot interact with most of the page - except the menu at the top. I'm using jQuery and the jQuery BlockUI plugin to do this. I call $(element).block() and it works fine, but the overlay only extends as far down as the current content of my page. As more content is loaded and added to the page the overlay moves down with it and this looks a bit ugly. Ideally I'd like it to cover the entire visible area of the page right from the start. A simple hack for doing this would be to set a large height value for the overlay, like this: $(myElement).block({ overlayCSS: { height: '10000px' } }); ... but this creates a scrollbar! How do I avoid this and make it just the right height to cover the visible page, but not enlarge it?

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  • How to disable listbox's click event

    - by StupidDeveloper
    I have a listbox which acts as a list of items. If you click on some item, it's contents are shown in the panel on the right (few textboxes etc.). I need to have a validation on these controls as all of them are required fields. And I do have it. The problem is that, even when the validators are not valid, user can click the listbox and change active index (that doesn't have impact on the panel on the right, as SelectedIndexChanged isn't fired). The validators are standard RequiredFieldValidator with their Display property set to "Dynamic". So, what I want is to disallow the user clicking on the listbox and changing the index untill all validators are Valid. What would be your solution for that? Is that even possible?

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  • How to change handedness of coordinates?

    - by 742
    How to convert from Euler's coordinates E1 = (x1, y1, z1, yaw1, pitch1, roll1) to E2 = (x2, y2, z2, yaw2, pitch2, roll2) where x, y, z are the coordinates of a point and yaw, pitch, roll the direction/orientation of a vector which origin is the point. yaw is around y, pitch around x, roll around z. They are performed in that order. Yaw 0 is normal to the plan xy (opposite to z in E1 and equal to z in E2). E1 uses a right handed space and E2 a left handed space. Both have the same origin, the same direction for y (top) and z (into the screen). They differ by x which is to the left on E1 and to the right on E2. They also differ by their direction of positive rotations. I've a custom type to hold the scalar representation and to convert from and to the equivalent WPF Matrix3d representation.

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  • Adjusting ComboBox DropDown Width in C#

    - by Jim Fell
    Hello. I have this code that adjusts the width of a comboBox drop-down: private void comboBox_DropDown(object sender, EventArgs e) { ComboBox senderComboBox = (ComboBox)sender; int width = senderComboBox.DropDownWidth; Graphics g = senderComboBox.CreateGraphics(); Font font = senderComboBox.Font; int vertScrollBarWidth = (senderComboBox.Items.Count > senderComboBox.MaxDropDownItems) ? SystemInformation.VerticalScrollBarWidth : 0; int newWidth; foreach (string s in ((ComboBox)sender).Items) { newWidth = (int)g.MeasureString(s, font).Width + vertScrollBarWidth; if (width < newWidth) { width = newWidth; } } senderComboBox.DropDownWidth = width; } It works great, except it expands the width of the drop-down to the right, whereas I would prefer it to expand to the left because the comboBox is located on the right side of my form. Any thoughts or suggestions you may have would be appreciated. Thanks.

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  • jquery stop image slider when accordian menu is closed

    - by Nik
    http://jsbin.com/emoba5/3/edit click here to view demo This accordion menu/image slider works well except - When the page loads and when all accordion menu items are closed I need it to show a single image on right. At the moment the page loads a blank picture area and when an accordion menu item is closed it just restarts that menu items picture slider. (So on page load and when all accordions are closed I need it default to an image on the right.) Some of the items only have 1 picture i.e. posture 3 you will notice when you click on it, it shows the image and then goes blank, can it just fade the image in and leave it there if there is only 1 image? Thanks to aSeptik for his help so far, feel free to make a revision of the posted code. Thanks guys Nik

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  • Set an Interface Builder created element's state programatically

    - by mvexel
    I have a couple of UISwitch elements in a view controller that is presented modally in my iPhone app. I set up the view in IB. I want these UISwitch elements to reflect the current values in my [NSUserDefaults standardUserDefaults] where I store the appropriate BOOLs. I thought this would do the trick setting the switches to the right state, but no: -(void)viewWillAppear:(BOOL)animated { NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [backgroundSwitch setOn:[defaults boolForKey:kTrackInBackgroundKey] animated:NO]; [batterySaveSwitch setOn:[defaults boolForKey:kBatterySaveKey] animated:NO]; } The backgroundSwitch and batterySaveSwitch are declared as properties for the view controller class. They are not initialized; that does not seem to make a difference. I did check the values coming out of the NSUserDefaults dictionary. The method is being called at the right time.

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  • Using jquery to make a POST, how to properly supply 'data' parameter?

    - by user246114
    Hi, I'd like to make an ajax call as a POST, it's going to go to my servlet. I want to send parameterized data, like the following: var mydata = 'param0=some_text&param1=some_more_text'; I supply this as the 'data' parameter of my jquery ajax() call. So this should be inserted in the body of the POST, right? (I mean, not appended to my 'mysite/save' url?): $.ajax({ url: 'mysite/save', type: 'POST', data: mydata }); it appears to work correctly. In my servlet, I am just dumping all received parameters, and I see them all come through nicely: private void printParams(HttpServletRequest req) { Enumeration paramNames = req.getParameterNames(); while (paramNames.hasMoreElements()) { // print each param key/val here. } } also, I should url encode my data string manually before use, right? Like: var mydata = 'param0=' + urlencode('hi there!'); mydata += '&param1=' + urlencode('blah blah'); mydata += '%param2=' + urlencode('we get it'); Thanks!

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  • Configuring log4net appenders via XML file *and* code

    - by Dave
    I started to play with log4net today and so far, I really like it. In order to preserve our current logging functionality, the app needs to create a new log file whenever the application is started. The log file name has the date and time stamp encoded in it. Currently, I've got log4net configured via an XmlConfigurator, which works great, except that the filename for my RollingFileAppender is hardcoded in the configuration XML file. I'd like to continue to use the XmlConfigurator, but after calling Configure(), I want to get at the RollingFileAppender and, in code, change its file value to be a dynamically-generated string. The sample documentation online seems to be down right now, but I've poked through the SDK reference, and it looks like I could use the Heirarchy and GetAppenders() to do what I need to do. Am I on the right track?

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  • Xpath help. Get childnode with variable name

    - by Kim Andersen
    I have the following XML: <StatsContainer> <Variant1>0</Variant1> <Variant2>0.5</Variant2> <Variant3>1.2</Variant3> <Variant4>4.1</Variant4> <Variant5>93.9</Variant5> <Variant6>0.3</Variant6> <Variant7>0</Variant7> <Variant8>0</Variant8> <Variant9>0</Variant9> <Variant10>0</Variant10> <Variant11>0</Variant11> <Variant12>0</Variant12> <GlobalVariant1>4.6</GlobalVariant1> <GlobalVariant2>40.4</GlobalVariant2> <GlobalVariant3>13.8</GlobalVariant3> <GlobalVariant4>2.8</GlobalVariant4> <GlobalVariant5>35.6</GlobalVariant5> <GlobalVariant6>2.8</GlobalVariant6> <GlobalVariant7>0</GlobalVariant7> <GlobalVariant8>0</GlobalVariant8> <GlobalVariant9>0</GlobalVariant9> <GlobalVariant10>0</GlobalVariant10> <GlobalVariant11>0</GlobalVariant11> <GlobalVariant12>0</GlobalVariant12> <MosaicType>Boligtype</MosaicType> <OverRepresentedVariant>5</OverRepresentedVariant> </StatsContainer> As you can see I have a number in the "OverRepresentedVariant"-tag. This number can change from time to time. What i Need is to grab the "Variant"-tag with the right number. In the above case I need to get the value from the "Variant5"-tag (93.9). Tomorrow the "OverRepresentedVariant"-value might have changed to 3, this would mean that I should now grab the "Variant3"-value instead. So this is what I got. I have a variable called $btOver which contains the above XML. I also have a variable called $btId which contains the "OverRepresentedVariant"-value like this: <xsl:variable name="btId" select="$btOver/OverRepresentedVariant" /> So now I need some help finding the Variant-tags with the right ID. The tags that I need will always be named "Variant" followed by an id. So how can I get the right tag? Thanks a lot in advance folks. /Kim Andersen

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