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  • "Exclusive" DirectDraw palette isn't actually exclusive

    - by CyberShadow
    We're maintaining an old video game that uses a full-screen 256-color graphics mode with DirectDraw. The problem is, some applications running in the background sometimes try to change the system palette while the game is running, which results in corrupted graphics. We can (sometimes) detect when this happens by processing the WM_PALETTECHANGED message. A few update versions ago we added logging (just log the window title/class/process name), which helped users identify offending applications and close them. MSN Live Messenger was a common culprit. The problem got worse when we found out that Windows Vista (and 7) does it "by itself". The WM_PALETTECHANGED parameters point towards CSRSS and the desktop window. In Vista, a workaround that often worked was to open any folder (Computer, Documents, etc.) and leave it open while running the game. Sounds ridiculous, but it worked - in most cases. In Windows 7, not even this workaround worked any more. Users found that stopping some services (Windows Update and the indexing service) also resolved the problem on some configurations. Some time ago I just started trying random things in hope of finding a solution. I found that setting the GDI palette (using Create/SelectPalette) before setting the DirectDraw palette (using IDirectDrawPalette::SetEntries) would restore the palette after it became corrupted (WM_PALETTECHANGED handler). SetSystemPaletteUse and calling SetPalette on the primary surface helped some more. However, there is still perceivable flickering when an application tries to steal the palette, which is especially prominent during fades. Question: is there a way to get a "real" exclusive palette, which completely disallows other applications changing the Windows palette as long as our game retains focus?

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  • Blank page shown in Mozilla Firefox

    - by Arun
    I have a jsf page which works perfectly fine[Both in IE and Mozilla Firefox] when the application is deployed locally. But i deploy it at the client place and I try to access the page in mozilla FF i get a blank page but it shows up properly in IE. Now if i do a remote desktop connection to the system where the application is deployed and try to access the same page i get to see the page correctly in both mozilla ff & IE Is this due to some sort of network issue specific to mozilla?

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  • QuadTrees - how to update when internal items are moving

    - by egarcia
    I've implemented a working QuadTree. It subdivides 2-d space in order to accomodate items, identified by their bounding box (x,y,width,height) on the smallest possible quad (up to a minimum area). My code is based on this implementation (mine is in Lua instead of C#) : http://www.codeproject.com/KB/recipes/QuadTree.aspx I've been able to successfully implement insertions and deletions successfully. I've turn now my attention to the update() function, since my items' position and dimensions change over time. My first implementation works, but it is quite naïve: function QuadTree:update(item) self:remove(item) return self.root:insert(item) end Yup, I basically remove and reinsert every item every time they move. This works, but I'd like to optimize it a bit more; after all, most of the time, moving items still remain on the same quadTree node most of the iterations. Is there any standard way to deal with this kind of update? In case it helps, my code is here: http://github.com/kikito/passion/blob/master/ai/QuadTree.lua I'm not looking for someone to implement it for me; pointers to an existing working implementation (even in other languages) would suffice.

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  • How would one use Cocos2d to create a game like this.

    - by John Stewart
    http://itunes.apple.com/us/app/angry-birds/id343200656?mt=8&ign-mpt=uo%3D6 So I am getting started with this all game dev thing on iphone and I decided that I will start playing with Cocos2d as my starting engine. Now just so i have a goal in mind, I picked angry birds as my initial target of what sort of game play would I like to learn to build. This is not going to be a market release game. This is totally going to be learning purposes only. So to start off my question is: Would something like this be achievable using Cocos2d? How would I go about building the physics for this? How can one do a screen scroll like the way they do in cocos2d? (any example code would be great) This is just to start off. If you have any particular questions please do add to this question.

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  • USSD Retrieve IMEI Number

    - by Gustavo De Micheli
    Hello, I'm very new at USSD developing. I have a question: Can I retrieve the IMEI number of a MS(Mobile Station) via an USSD PUSH Application? The idea is to create an application that is pushed by the gateway, and is totally transparento to the Mobile phone user. Can it be done? Thanks for reading

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  • How to set focus to a web control in ASP.NET

    - by Dan7el
    Question: What is the best way to set focus to a web control in ASP .NET. I can do it, but it's ugly. I have a web control wrapped in a web control hosted on a web page. So, if you do a view | source on the page the id is something like WrapperControl_Control_TextBox. I've tried the "tried and true" Javascript methods of grabbing the element and setting it's focus: document.getElementByID( "WrapperControl_Control_TextBox" ).focus(); and it didn't work. I'm not sure why. I know I could possibly do: document.getElementById( "<%= TextBox.ClientID %" ).focus(); too, I think. This won't work because of another totally separate error based on the fact you can't dynamically add controls to a header if there is a "<% %" in the page. GAH. In the "bottom-most" control, I've tried setting the focus (TextBox.Focus() in Page_Load) and that doesn't work either. Anyway, the way that works is by simply taking the ControlsCollection of the Page, grabbing the control I need from that, getting it's collection, grabbing the next lower control and so forth. I only have to do this seven times. So I have eight foreach loops. Basically, my code is like this: /////////////////////////////// // On the page /////////////////////////////// ControlCollection controls = Controls; foreach( Control control in controls) { if ( string.Equals( control.ID, "FormID", StringComparison.InvariantCultureIgnore ) ) { ControlCollection nextControls = control.Controls; foreach( Control nextControl in nextControls ) { if ( string.Equals( nextControl.ID, "DivICareAboutInTheForm", StringComparison.InvariantCultureIgnor ) ) { ControlCollection nextNextControls = nextControl.Controls; //: //: //Yes, it's that bad and so forth. //: //: } } } }

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  • A rocket following the tracks height. Not Homing Missile.

    - by confusedEj
    What I am trying to create is a rocket that will hug the track in a straight direction. ie) The rocket travels in a straight direction and can orientate based on its local x axis. This is so it can go up/down ramps and never hit the ground. Currently I am using PhysX opengl and C++. This is the method I'm trying right now: 1. Ray cast from ahead of the missile (ray casting downwards) 2. If the ray cast is less then the expected ray cast length, then I have to orientate up. 3. If the ray cast is more then the expected ray cast length, then I have to orientate down. Now the problem, I am having is that my missile is orientating at an arbitary angle (I'm giving it 1 degrees.) Though I think this is a bad approach because the amount of frames in the game is not as much as I would think there would be. So the rocket would run into a ramp. My main question is: is there a better way of approaching this and how? NxVec3 frontRayLoc = m_rocketConfig->getValueForKey<NxVec3>("r_frontRayCastLocation"); float threshhold = m_rocketConfig->getValueForKey<float>("r_angleThreshhold"); float predRayCastHeight = m_rocketConfig->getValueForKey<float>("r_predRayCastHeight"); NxVec3 rayGlobalPos_1 = m_actor->getGlobalPosition() + m_actor->getGlobalOrientation() * frontRayLoc; NxVec3 dir = m_actor->getGlobalOrientation() * NxVec3(0,-1.0,0); NxReal dist1 = castRay(rayGlobalPos_1, dir); // Get the percentage difference float actualFrontHeight = abs(1 - (dist1/predRayCastHeight)); // See if the percentage difference is greater then threshold // Also check if we are being shot off track if ((actualFrontHeight > threshhold) && (dist1 != m_rayMaxDist)){ // Dip Down if (dist1 > predRayCastHeight){ printf("DOWN - Distance 1: %f\n", dist1); // Get axis of rotation NxVec3 newAxis = m_actor->getGlobalOrientation() * NxVec3(1.0,0,0.0); // Rotate based on that axis m_orientateAngle = -1.0 * m_orientateAngle; // For rotating clockwise NxQuat newOrientation(m_orientateAngle, newAxis); NxMat33 orientation(newOrientation); m_orientation = m_orientation * orientation; // Orientate the linear velocity to keep speed of rocket and direct away from road NxVec3 linVel = m_actor->getLinearVelocity(); m_actor->setLinearVelocity(m_orientation * linVel); } // Go Up else if (dist1 < predRayCastHeight){ printf("UP - Distance 1: %f\n", dist1); // Get axis of rotation NxVec3 newAxis = m_actor->getGlobalOrientation() * NxVec3(1.0,0,0.0); // Rotate around axis NxQuat newOrientation(m_orientateAngle, newAxis); m_actor->setGlobalOrientationQuat(newOrientation); NxMat33 orientation(newOrientation); m_orientation = m_orientation * orientation; // Orientate the linear velocity to keep speed of rocket and direct away from road NxVec3 linVel = m_actor->getLinearVelocity(); m_actor->setLinearVelocity(m_orientation*linVel); } m_actor->setGlobalOrientation(m_orientation); } Thanks for the support :)

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  • In writing games that deal with scancodes, what do I need to know to support international keyboards

    - by sludge
    I am writing an input system for a game that needs to be able to handle keyboard schemes that are not just qwerty. In designing the system, I must take into consideration: Two types of input: standard shooter controls (lots of buttons being pressed and raw samples collected) and flight sim controls (the button's label is what the user presses to toggle something) Alternative software keyboard layouts (dvorak, azerty, etc) as supplied by the OS Alternative hardware keyboard layouts that supply Unicode characters My initial inclination is to sample the USB HID unicode scancodes. Interested on thoughts on what I need to do to be compatible with the world's input devices and recommendation of input APIs on both platforms.

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  • Ruby as a scripting language for web server

    - by Olivier Lalonde
    Is it possible to use Ruby as a scripting language with a HTTP server ? I'd like to be able to simply put some Ruby files in a web directory and be able to execute them from my browser - just like I did with PHP. I have absolutely nothing against frameworks such as RoR, but I was told that I should first learn Ruby and only then move on with higher level frameworks. Of course, I could write some Ruby scripts and run them in the console, but I would prefer getting the input/output from my browser :) Is that possible at all ? Otherwise, how hard would it be for me to build a quick and simple web framework ?

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  • How does this Singleton-like web class persists session data, even though session is not updated in

    - by Micah Burnett
    Ok, I've got this singleton-like web class which uses session to maintain state. I initially thought I was going to have to manipulate the session variables on each "set" so that the new values were updated in the session. However I tried using it as-is, and somehow, it remembers state. For example, if run this code on one page: UserContext.Current.User.FirstName = "Micah"; And run this code in a different browser tab, FirstName is displayed correctly: Response.Write(UserContext.Current.User.FirstName); Can someone tell me (prove) how this data is getting persisted in the session? Here is the class: using System; using System.Collections.Generic; using System.Linq; using System.Web; public class UserContext { private UserContext() { } public static UserContext Current { get { if (System.Web.HttpContext.Current.Session["UserContext"] == null) { UserContext uc = new UserContext(); uc.User = new User(); System.Web.HttpContext.Current.Session["UserContext"] = uc; } return (UserContext)System.Web.HttpContext.Current.Session["UserContext"]; } } private string HospitalField; public string Hospital { get { return HospitalField; } set { HospitalField = value; ContractField = null; ModelType = null; } } private string ContractField; public string Contract { get { return ContractField; } set { ContractField = value; ModelType = string.Empty; } } private string ModelTypeField; public string ModelType { get { return ModelTypeField; } set { ModelTypeField = value; } } private User UserField; public User User { get { return UserField; } set { UserField = value; } } public void DoSomething() { } } public class User { public int UserId { get; set; } public string FirstName { get; set; } } I added this to a watch, and can see that the session variable is definitely being set somewhere: (UserContext)System.Web.HttpContext.Current.Session["UserContext"]; As soon as a setter is called the Session var is immediately updated: set { HospitalField = value; //<--- here ContractField = null; ModelType = null; }

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  • How to choose the right web application framework?

    - by thenextwebguy
    http://en.wikipedia.org/wiki/Comparison_of_web_application_frameworks Since we are ambitiously aiming to be big, scalability is important, and so are globalization features. Since we are starting out without funding, price/performance and cost of licences/hardware is important. We definitely want to bring AJAX well present in the web interface. But apart from these, there's no further criteria I can come up with. I'm most experienced with C#/ASP.net, PHP and Java, in that order, but don't turn down other languages (Ruby, Python, Scala, etc.). How can we determine from the jungle of frameworks the one that suits best our goal? What other questions should we be asking ourselves? Reference material: articles, book recommendations, websites, etc.?

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  • Divs over images using JavaScript

    - by Abhi
    Say I have an image with a couple of dots in a web page. When someone clicks on the dots I want a JavaScript function to be executed and then a div placed over the clicked dot in the image. Something akin to markers in maps. How do I go about doing this?

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  • Is it possible to stop a javascript with Firebug without using breakpoints?

    - by Sandra
    Is it possible with Firebug to stop a javascript with a press of a button or a keyboard shortcut instead of stopping it by setting a breakpoint? Why would I like to do this? We have a very dynamic website with lots of animations. It would be a great help if I could just stop the scripts at the moment the animation is doing something I want to inspect. That would be a lot faster than fiddling with the breakpoints.

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  • WebSockets authentication

    - by Tomi
    What are the possible ways to authenticate user when websocket connection is used? Example scenario: Web based multi-user chat application through encrypted websocket connection. How can I ensure (or guarantee) that each connection in this application belongs to certain authenticated user and "can't be" exploited by false user impersonation during the connection.

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  • Best way to set-up an iPhone project?

    - by wgpubs
    Looking for the best way to set-up an iPhone project in XCode ... namely: What is the preferred project template to start with (e.g View-Based or Windows-Based application)? What folder structure should I create in XCode to manage the project? For example, under "Classes" is it a preferred practice to add Models, Views and Controllers sub-folders? Any other best practices, tips, etc... would be appreciated. Thanks

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  • print web on dot matrix receipt printer

    - by nightingale2k1
    Hi, I need to print a receipt from my web based apps using dot matrix printer epson tm-u220d (pos printer). I need to know, should I generate the receipt in html or in plain text ? I ever saw some commands for dot matrix printer to change the font size, line feed etc .. but I don't remember that commands. if I have to use plain text I need to use that commands. anyone knows where i can get the references ? Thanks

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  • Stored Procedure in Entity Framework

    - by kamal
    Hi I had added the Stored procedure in my Entity framework and i also imported the functions in the edmx. Is it must to add all the three functions insert, update, and delete functions to a table. I had tried with insert alone and also with all, but why can't i get the name of the stored procedure in the connection string. Let me know what i done clearly. I had added the sp i had imported the functions in the model browser. i had also mapped the insert, update and delete function to the table with return type only for insert and update. Still i can't get the name of SP in the connection string. Please let me know how could i resolve this issue. Thanks in Advance, Kamal.

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  • How do you rotate a sprite around its center by caclulating a new x and y position?

    - by Sam152
    I'm using Dark GDK and C++ to create a simple 2d game. I'm rotating an object but it rotates from the top left corner of the sprite. I have the following variables available: PlayerX PlayerY PlayerWidth PlayerHeight RotateAngle (360 x 0) Is there an algorithm that will modify the pivot point of the sprite, preferable to the center? Here is a small code sample: void Player::Move( void ) { if ( checkLeft() ) { PlayerX -= PlayerSpeed; if ( PlayerX < 0 ) PlayerX = 0; } if ( checkRight() ) { PlayerX += PlayerSpeed ; if ( PlayerX > 800 - PlayerWidth ) PlayerX = 800 - PlayerWidth; } if ( checkUp()) { PlayerY -= PlayerSpeed; if ( PlayerY < 0 ) PlayerY = 0; } if ( checkDown()) { PlayerY += PlayerSpeed; if ( PlayerY > 600 - PlayerHeight) PlayerY = 600 - PlayerHeight; } RotateAngle += 5; if(RotateAngle > 360) RotateAngle -=360; dbRotateSprite(Handle,RotateAngle); dbSprite ( 1 , PlayerX , PlayerY , Handle ); } Edit I'm considering opening up some reputation for this question, I have yet to be provided with an answer that works for me. If someone can provide an actual code sample that does the job, I'd be very happy. The problem with Blindy's answer is that no matter how much I simply translate it back or forth, the spirte still rotates around the top left hand corner and moving it somewhere rotating around the top left corner, then moving it back to the same position accomplishes nothing. Here is what I believe to be going on: Just so there is no confusion I have created a an image of what is going on. The left shows what is actually happening and the right shows what I need to happen.

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  • How to develop a site for multiple browsers these days ?

    - by Misha Moroshko
    I would like to develop a site that works in all major browsers. I wonder what tools are available these days that may help me to check the functionality across browsers. I mean after I add some functionality to my site, I want to check it in all browsers. Are there any tools/software for this task ? I understand that it's impossible to check everything because it is pretty subjective if something works as expected or not, but maybe there are some tools that may found major errors (like IE is not supporting indexOf).

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  • Best second language to learn for a native english speaking programmer?

    - by Tom Dignan
    I have always wanted to learn a foreign language, but I would like to pick one that can also help me the most in my career. I'm in the US, so it is not necessary for me to learn a second language to influence my career success, however I think knowing one and speaking it fluently could potentially put me in a more interesting career than if I did not. I would like to be able to travel the world, especially if I could have a reason to go one place or another. Which leads me to my question: What is the best second language to learn for a native English speaking programmer? (Especially from the US) Some ideas that come to mind for me are Mandarin, German, Japanese, French... I am looking for experienced opinions though! Thanks.

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