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  • Is this a valid HTTP response? [migrated]

    - by fatmck
    I am writing a web server using C++, which responds the following for all requests: static std::string rsp[] = { "HTTP/1.1 200 OK\r\n", "Server: WebServer\r\n", "Content-Type: text/html\r\n", "Content-Length: 3\r\n", "Connection: close\r\n", "\r\n", "123" }; the content "123" can be successfully shown in browser. But when I use apache-ab to do a test, ab always show errors like this: ab -n 1 -c 1 http://127.0.0.1:1080/ apr_socket_recv: Connection reset by peer (104) I thought that I'm closing the socket too quickly, so I commented the close() function. But ab just hold, ab seems to be waiting for a complete response.

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  • Unable to start GUI app from upstart

    - by novice
    As part of post-start of my app say "mydaemon" i want to launch a gui app say "mygui" I am unable to do this. I have verified user perm using xhost, DISPLAY variable is set correctly. conf file in /etc/init/ is given below me@ubuntu:~/term$ cat /etc/init/agentd.conf description "my daemon" author "me" start on runlevel [2345] stop on runlevel [016] console output kill timeout 60 respawn respawn limit 3 15 Allow some clean up time post-stop script env DISPLAY=:0.0 cd /home/me ./mygui sleep 1 end script script cd /home/me ./myapp end script post-start script env DISPLAY=:0.0 cd /home/me ./mygui end script sdn@ubuntu:~/term$ any suggestions?

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  • Vectors with Circles Physics -java

    - by Joe Hearty
    This is a problem I've been having, When making a set number of filled circles at random locations on a JPanel and applying a gravity (a negative change in the y), each of the circles collide. I want them to have collision detection and push in the opposite direction using vectors but i don't know how to apply that to my scenario could someone help? public void drawballs(Graphics g){ g.setColor (Color.white); //displays circles for(int i = 0; i<xlocationofcircles.length-1; i++){ g.fillOval( (int) xlocationofcircles[i], (int) (ylocationofcircles[i]) ,16 ,16 ); ylocationofcircles[i]+=.2; //gravity if(ylocationofcircles[i] > 550) //stops gravity at bottom of screen ylocationofcircles[i]-=.2; //Check distance between circles(i think..) float distance =(xlocationofcircles[i+1]-xlocationofcircles[i]) + (ylocationofcircles[i+1]-xlocationofcircles[i]) ; if( Math.sqrt(distance) <16)

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  • How to redesign the UI of a large project?

    - by jem88
    I'm currently working at a quite big Android project (a social network, you can see it here if is useful to answer the question). We decided to restyle the whole app, changing all the UI design. The code I actually have is complex, there are many controllers, and it's a little messy too. Is it "better" in terms of time and code cleanliness to take one controller per time, and rewrite it entirely, or to modify one controller per time? The layout change entirely anyway, so for that I know I've to restart from scratch. Maybe it could seem a stupid question, but with the "time" variable I really can't see the best way.

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  • How to manage the images for my Desktop Application

    - by NonExistent
    What's the better way to manage the image files of my app? i've been thinking about the way that i do right now (save the image as a BLOB IN db), and i ask myself if would be better to manage the image as text in my DB, i mean, convert the image to hex(length of 500), then save in the db as text, and when calling it convert it from hex to image, or something like that, but what do you consider as an Experienced Progammer that is the better way? Maybe the question is too broad, but i need to know that, and nobody answers me anywhere...

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  • What job is most similar to being a DBA?

    - by fatherjack
    As long as I have worked with computers, and that's a length of time that may be easier on the eye when converted to dog-years, computers have been compared with cars. I guess the car was the most complicated thing in our lives until the PC arrived. We had plenty of time to get used to the car and how it worked, or not, and how it gradually became more complex. We can compare backups to spare tyres, CPU cores to pistons ("the more you blow, the faster you go"), and so on. I am not aware...(read more)

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  • Should I try to write simple key-value storage by myself?

    - by shabunc
    I need a key-value storage in a simplest form we can think of. Keys should be some fixed-length strings, values should be some texts. This key-value storage should have an HTTP-backed API. That's basically it. As you can see, there is no big difference between such storage and some web application with some upload functionality. The thing is - it'll take few hours (including tests and coffee drinking) to write something like this. "Something like this" will be fully under my control and can be tuned on demand. Should I, in this specific case, not try to reinvent bicycles? Is it better to use some of existing NoSQL solutions. If yes, which one exactly? If, say, I'd needed something SQL-like, I won't ask and won't try to write something by myself. But with NoSQL I just don't know what is adequate and what is not.

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  • IE10 apporte un meilleur support du HTML5 sur Windows Phone 8, Microsoft détaille les différences avec la version Windows 8

    IE 10 apporte un meilleur support du HTML 5 sur Windows Phone 8 Microsoft détaille les différences avec la version Windows 8 L'une des principales causes des mauvaises performances du HTML5 sur le mobile serait le niveau de support de ses fonctionnalités par les navigateurs mobiles qui serait très variable par rapport au Desktop. Avec la sortie de Windows Phone 8 qui dispose d'une déclinaison mobile du navigateur Internet Explorer 10, Microsoft a principalement mis l'accent sur le support du HTML5. La société dans un billet de blog, fait le point sur les améliorations du navigateur concernant le standard du Web, ainsi que ses différences avec la version pour Windows 8.

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  • Screen Brightness Stuck on high on an HP dv7t laptop

    - by theJollySin
    I have an otherwise fully-functioning install of Ubuntu 12.04 on my HPdv7t laptop. When I press the 'brightness buttons' on the keyboard the associated images appear on my screen to say I am increasing/decreasing the screen brightness. When I go into "System Settings" I can move the 'brightness slider bar' up and down. But none of that changes the fact that my screen is stuck on the highest brightness setting. ANY clues on how to fix this would be greatly appreciated. This giant 17-inch monitor is blinding, and this is making it hard to code for any length of time.

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  • jQuery setTimeout delay for an element

    - by Trouble
    Is there an easier way to wait for an element to load ( by independant script/mootools/other ). For example: I am waiting for a google map to load, but I don't want to use its API for checks. So I made two functions: function checkIfexist() { if(jQuery('#container').length) return 0; else reload(1); } function reload(mode) { setTimeout(function(){ do stuff . . . if(mode==1) checkIfexist(); }, 400); } I am starting it with reload(1); Is there an easier way to use setTimeout in such a way? I don't want to use delay, wait or whatever.

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  • How to name a clamp function that only clamps from one side?

    - by dog_funtom
    Clamp() is a function that ensures that provided variable is in provided range. You can find such function in .NET, in Unity, and probably anywhere. While it is useful, I often need to clamp my value from one side only. For example, to ensure that float is always non-negative or always positive (like radius value from inspector). I used names ClampFromAbove() and ClampFromBelow(), but I wonder if such names is good or even grammatically valid in programming-English. Also, it probably make sense to distinguish non-negative case too. How'd you name such function? Something like EnsureNonNegative()? My intention is creating pair of extension methods and use them like this: var normalizedRadius = originalRadius.ClampFromBelow(0.0001); var distance = someVector.Magnitude.ClampFromAbove(maxDistance);

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  • Why don't my Google Analytics custom segmentation visit numbers match up?

    - by Hates_
    I have three main areas of my site and want to track total usage as well as breakdowns of the three parts. I am trying to segment the "type" of use on each page using a custom variable as such: ['_setCustomVar',1,'Visitor Type','Unknown',1] Visitor type can be one of three values: "Unknown", "Reader" or "publisher". Every page has this value set. Now when I look at my analytics chart and chose all three segments, the individual values do not match the sum. I've double checked the pages to make sure the custom var is there.

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  • IE9 Preview disables CLR DEVPATH feature

    (This is not related to IKVM.NET, but since I spent several hours tracking this down, I thought I'd write it up here in the hope anyone else struggling with this will find it.) One of the lesser known (development) features of the CLR is the ability to override the regular Fusion assembly loading rules by setting the DEVPATH environment variable (and adding an entry to the machine.config to enable this). It turns out that this feature can be disabled...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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  • C++ function returning pointer, why does this work ? [migrated]

    - by nashmaniac
    So heres a simple c++ function what it does it take an array of characters as its argument and a integer n and then creates a new character array with only n elements of the array. char * cutString(char * ch , int n){ char * p = new char[n]; int i ; for(i = 0 ; i < n ; i++) p[i] = ch[i]; while(i <= n ){ p[i++] = '\0'; } return p ; } this works just fine but if I change char * p = new char[n]; to char p[n]; I see funny characters what happens ? What difference does the former make also p is a temporary variable then how does the function returns it alright ?

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  • Is there a prohibition against scaling collision shapes at runtime?

    - by Almo
    So, I have a StaticMeshComponent attached to an Actor: Begin Object Class=StaticMeshComponent Name=StaticMeshComponentObject StaticMesh=StaticMesh'QF_Art_Powers.Mesh.GP_ForcePush' CollideActors=true BlockActors=false //Scale3D=(X=5, Y=1.5, Z=3) // ALMODEBUG End Object CollisionComponent=StaticMeshComponentObject Components.Add(StaticMeshComponentObject) Ordinarily, the actor gets spawned, anything touching it gets bumped, and the actor despawns itself. If I set the Scale3D as a default property, everything works as I expect. But I want to scale it at runtime, like this: function SetImpulseComponentTemplate(QuadForceBoxImpulseComponent Value) { Local Vector ScaleVec; ScaleVec.X = Value.Length; ScaleVec.Y = Value.Width; ScaleVec.Z = Value.Height; CollisionComponent.SetScale3D(ScaleVec); } When I do this, the thing only collides as if it were not scaled. If I leave the actor spawned so I can see it, it is scaled. If I also "show collision", the collision displays correctly as well. Is there a prohibition against scaling collision shapes at runtime?

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  • Array sum of difference of first smallest k elment

    - by prateeak ojha
    Hi i come across this challenge on an online programing challange the task is so simple for ex WE have to variable N and K where N is where N is lenght of array and we have to find sum of duiffrence of K smallest element of array as Sample Input 10 4 1 2 3 4 10 20 30 40 100 200 Sample Output 10 Explanation #0 We have 10 as N size of array and K is 4 here the next N values are array's elments in order to find sum of diffrences we will takek smallest values from array which are 1,2,3,4 then will perform operation(sum of difference) as |1-2| + |1-3| + |1-4| + |2-3| + |2-4| + |3-4| = 10 I tried solving the problem and found a way through which i can solve the problem wit N^3 complexity but my solution is rejected i need a approach to solve the problem with n complexity i still can't figure out a way .. looked at some solution but coud'nt find the exact way to approach. if anybody have a better idea and would like to share it would be appreciable thanks in advance

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  • Implementing unlockable items on Android

    - by coder_For_Life22
    I know this would be a beginners question (some of you might think) but I would like to know different approaches for this. I have a game with lets say 20 unlockable items, at the main menu I have a button where the user can go to an activity and view the unlockable items. So I would like for it to have a "Locked image" and under it a text telling you what the item is and maybe how to unlock it. What is the best way of going about this? And then when the item is unlocked during the game, maybe put a variable in the shared preference and check at the beginning of the activity with the unlockabled items. Let me know what you guys think. Thanks.

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  • Random List of numbers in C

    - by Ant
    I have just started a C programming course and so far have only done the basics like printf, read a little on variables etc on the course book. The teacher has tasked us with writing a program that will take a value entered by the user, this will be the number of students in the class (25 at the moment but can be variable). It will then list the number of students randomly and place them in 3 columns. The purpose is to sort students into groups of 3 randomly, then display on the screen in columns. Now my question is not for the code that defeats the object of me attempting the exercise, but how to structure it. I can see that using an array can be used to display the list, but really after some pointers on how best to approach the problem in blocks, then I can attempt to program each block.

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  • Making a physicalized melee weapon

    - by xuincherguixe
    The short version, is that I was asked to look into the feasibility of making a melee weapon, that one could swing at another object in the game, and have it interact physically. I completed the tutorial here http://www.mavrikgames.com/tutorials/melee-weapons, and proved that indeed it is. The thing is, that only for a brief period in the swing is the sword capable of knocking things around. I've looked through the editor and code for awhile now, and I'm still not sure how to do this. I was able to lengthen the amount of time it takes the animations run for, but not the length of time with which the sword can bash the barrel around.

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  • Name for this antipattern? Fields as local variables

    - by JSB????
    In some code I'm reviewing, I'm seeing stuff that's the moral equivalent of the following: public class Foo { private Bar bar; public MethodA() { bar = new Bar(); bar.A(); bar = null; } public MethodB() { bar = new Bar(); bar.B(); bar = null; } } The field bar here is logically a local variable, as its value is never intended to persist across method calls. However, since many of the methods in Foo need an object of type Bar, the original code author has just made a field of type Bar. This is obviously bad, right? Is there a name for this antipattern?

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  • Getting velocity in only one plane (X) in Kismet (UDK)

    - by anna1987
    I'm trying to make a character in 2.5 platformer (in UDK) to "climb" a giant tree trunk by walking on a spiral staircase enveloped around the tree. When character goes right the tree rotates thru matinee sequence so it seems that the character is moving while in reality it is the tree that moves. I connected the matinee sequence playrate to the velocity of the character and its all good as long the character just moves left or right. When it jumps though, the velocity still affects the playrate - it should not as character moves up/down, not right/left. How do I set it up in Kismet so I get a float variable with velocity only in the X plane (horizontal)?

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  • Separating Db from business with Inherited classes using multiple views

    - by catalinux
    I have a software that has a car model that will be used in different views (listing, ads, detail page, carousel, up sell widget,etc). class CarModel extends DbModel{ } I look for a "nice way" (a combination of flexible, easy to maintain,etc) to have this used in views. I'm thinking at two different ways Having object views for each context CarViewBase{ var car;// of type CarModel function constructor(args){ //will instantienta internal variable car based on args } function getThumb(){ } function getTitle(){ } } CarListingView extends CarViewBase{ function getListing(){ } } CarAdsView extends CarViewBase{ //the busines rule changes for ads widget function getThumb(){ } } Extending directly the CarModel The challenges comes when My Car Model might need an abstract factory. Let's say I have a field on my car object that states the type of the car : a truck, or a bike, or van. How would affect that my object view? Let's say that getTitle() rule would be different for each type of it. How would you do it?

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  • How to export user input data from python (Tkinter) to excel? [migrated]

    - by mrn
    I am trying to develop a user form in python 2.7.3. Please note that I am a python beginner. I am trying to use xlwt to export data to excel. I want to write values of following variables i.e. a (value to write:'x1') & d (value to write: be user defined information in text box), to an excel sheet, a=StringVar() checkBox1=Checkbutton(root, text="text1", variable=a, onvalue="x1", offvalue="N/A") checkBox1.place(relx=0., rely=0., relwidth=0., relheight=0.) checkBox1.pack() d=StringVar() atextBox1=Entry(root, textvariable=d, font = '{MS Sans Serif} 10') atextBox1.pack()

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  • Add closure after concatenating files or keep one for each separate file?

    - by sdespolit
    At the moment every javasrcipt file in our project includes closure wrapper. Before deploying all files are concatenated and minimized. And i'm asking myself, do we really need all that closures OR one closure added after concatenation will do the job. I can see only one reason not to do that - the variable we are sharing between files will get in the global namespace. But there is no conflict so is don't see any problem. The real question is what other cons may be? Or more generally what approach is better - one closure or many?

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  • How to create a manager class without global variables nor singletons?

    - by Omega
    I would like to implement some kind of manager class in my application. It will be in charge of loading textures, processing them, distributing them etc... At first, I wanted to make a global variable that simply contains an instance of my manager class. I found this question: http://stackoverflow.com/questions/4646577/global-variables-in-java. However, the users there seem to recommend to never use global variables. Fine then, I once heard about Singletons, so I though I could use that instead. I mean, creating just one instance of my manager class sounds good. However, I found this other question: When is Singleton appropriate?, which basically tells me that Singletons are, in most scenarios, some kind of anti-pattern. Now I am a bit lost - what other approach can I take to create my manager class, whose only requirement is to be accessible from anywhere?

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