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  • checking whether 4 points in a plane define a square ??

    - by osabri
    how to check whether 4 points in the plane define a square? what's the function which given a point and a value of the area of a square as input parameters returns four squares(define a corresponding type) with sides parallel to the x axis and y axis this how i start: #include <stdio.h> #include<math.h> struct point{ float x; float y; } typedef struct point POINT; struct square{ struct point p1; struct point p2; struct point p3; struct point p4; } typedef struct square SQUARE; int main() { int point; printf("point coordinate"); printf("\n\n"); printf("enter data\n");

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  • jquery get radiobuttonlist by id dynamically

    - by Cindy
    I have two radiobuttonlist and one checkboxlist on the page. Ideally based on the checkbox selected value, I want to enable/disable corresponding radibuttonlist with jquery function. But some how $("input[name*=" + columnName + "]") always return null. It can not find the radiobuttonlist by its name? $(function() { function checkBoxClicked() { var isChecked = $(this).is(":checked"); var columnName = "rblColumn" + $(this).parent().attr("alt"); if (isChecked) { $("input[name*=" + columnName + "]").removeAttr("disabled"); } else { $("input[name*=" + columnName + "]").attr("disabled", "disabled"); $("input[name*=" + columnName + "] input").each(function() { $(this).attr("checked", "") }); } } //intercept any check box click event inside the #list Div $(":checkbox").click(checkBoxClicked); });

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  • What exactly does it mean when $_FILES is empty?

    - by Mike
    I am working on an upload script and when testing my error checks, I attempted to upload a 17MB TIFF file. When I do this the $_FILES array is empty. The script works fine for what I need it to do, which is to upload JPEG files. My solution is to test if $_FILES is empty or not before continuing with the upload script. Can anybody explain why $_FILES is empty when a TIFF is attempted to be uploaded? Is my solution, to check if $_FILES is empty or not, an okay one?

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  • Why does DestroyWindow close my application?

    - by user146780
    I'v created a window after creating my main one but calling DestroyWindow on its handle closes the entire application, how can I simply get rid of it? it looks like this: BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; HWND fakehandle; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW | WS_EX_LAYERED, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); fakehandle = CreateWindow(szWindowClass, "FAKE WINDOW", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd || !fakehandle) { return FALSE; } //some code DestroyWindow(fakehandle); ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } how can I destroy this window without destroying my main one? I'm creating a dummy window to check for multisampling in OpenGL. Thanks

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  • Java - How to find that the user has changed the configuration file?

    - by Yatendra Goel
    I am developing a Java Desktop Application. This app needs a configuration to be started. For this, I want to supply a defaultConfig.properties or defaultConfig.xml file with the application so that If user doesn't select any configuration, then the application will start with the help of defaultConfig file. But I am afraid of my application crash if the user accidentally edit the defaultConfig file. So Is there any mechanism through which I can check before the start of the application that whether the config file has changed or not. How other applications (out in the market) deal with this type of situation in which their application depends on a configuration file? If the user edited the config file accidentally or intentionally, then the application won't run in future unless he re-installs the application.

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  • ArgumentException or ArgumentNullException for string parameters?

    - by Anna Lear
    Far as best practices are concerned, which is better: public void SomeMethod(string str) { if(string.IsNullOrEmpty(str)) { throw new ArgumentException("str cannot be null or empty."); } // do other stuff } or public void SomeMethod(string str) { if(str == null) { throw new ArgumentNullException("str"); } if(str == string.Empty) { throw new ArgumentException("str cannot be empty."); } // do other stuff } The second version seems more precise, but also more cumbersome than the first. I usually go with #1, but figured I'd check if there's an argument to be made for #2.

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  • Is there a version of postActionEvent for KeyEvent (specifically for a JTextArea)?

    - by Brian Pelc
    I'm writing a program that contains multiple JTextFields and 2 JTextAreas within an input panel. I have a submit button on the bottom. I have it set up so when a user types something into each field (including the JTextAreas) and hits the Enter key, it updates a text file, and when they press the submit button it updates the file then outputs a new version of it in the local directory. If the user presses Enter in any of the fields, it validates their input, however, I want to re-validate all fields when they press the submit button. Each field (again, JTextAreas included) has it's own validation check within its ActionListener or KeyListener (for the JTextAreas). It's easy enough to use postActionEvent() for the JTextFields, but is there a similar method for the JTextAreas to force fire a KeyEvent? I don't want to duplicate code and consume memory by re-writing the validation for those 2 Components inside the ActionEvent for the JButton. Unfortunately, I can't provide a sample because I'm writing the program on a classified machine (PC).

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  • Mocking my custom dependencies with Spring

    - by Brabster
    Is is possible to declare mocks using some mocking framework for my own classes declaratively with Spring? I know there are some standard mocks available in Spring, but I'd like to be able to mock out my own classes declaratively too. Just to check I'm not going about this the wrong way: the idea is to have a pair of JUnit test and Spring config for each integration test I want to do, mocking everything except the specific integration aspect I'm testing (say I had a dependency on two different data services, test one at a time) and minimising the amount of repeated Java code specifying the mocks.

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  • How to find what element mouse is over in Prototype

    - by DavidP6
    I have a situation where an element is shown using ajax. I have attached mouseenter and mouseleave events to it to show a menu connected to the element using prototype. This works fine, but the problem I am having is that if a user has his/her mouse in the place where the element is shown before it is shown, the mouseenter does not get triggered and the attached menu does not get shown. I already have an afterFinish function that is called after a SlideDown effect, so I was thinking I could put another function in there to check if the users mouse is over the element or not. How would I go about checking what element the users mouse is over in prototype?

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  • ASP.NET MVC: trying out a script injection hangs Visual Studio 2010 completely?

    - by Mark Redman
    Wondering if anyone has an idea of whats going on: I am new to ASP.NET MVC and am trying out a few things with jquery/ajax. The basic scenario is a dropdownlist with an add button next to it. Clicking the add button launches a jquery ui dialog with a textbox form, entering a value saves the item to the database and refreshes the drop-downlist. The dropdownlist is re-populated using a JSON result. This all works ok. I thought I would try a script injetion attack, ie add the text: alert("oh dear") to seee what would happen and to check if I need to encode anything. When I try and save this item (similar to the same process of adding a plain text entry) Visual Studio 2010 Beta 2 hangs completely. Any ideas? UPDATE: It happens when posting: "</"

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  • ASP.NET UpdatePanel PostBacks

    - by Matthew
    I created a marker interface: public interface ISupportAJAXPostsBacks{} I added it to my Page.. public partial class MyWebForm : PageBase, ISupportAJAXPostsBacks I have this check in my PageBase class... if(this is ISupportAJAXPostsBacks) { ... do some stuff ... } If I step through via the debugger, "this is ISupportAJAXPostsBacks" evaluates to true for the initial page load, but evaluates to false when an UpdatePanel posts back on that same page. (scratches head) What is happening under the covers to cause this and what can I do about it?

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  • Front-end phtml template form doesn't connect to controller.php file

    - by user888786
    The web system which I'm working on right now, has a add.phtml (in views folder) form, which contain normal form elements and pageController.php (in Controller folder) file which has function to be connected when user hit "add page" button on the form. The codes goes like this. on add.phtml file, input type = "submit" value ="Add Page" on pageController.php file, function insertAction(){ } For some reason these two doesn't connect now. Is anybody have any idea why this doesn't work or what should I check on this kind of a problem. The web system on zend framewok. I really appreciate if someone can help me.

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  • ssh via putty using hostname in opensuse

    - by Ashutosh
    Hi All, I am using opensuse 11.3 and it is connected to DHCP network. I am using putty to connect top machine from window with command: putty -ssh user@ip-address (it works fine) but when trying to connect using hostname it fails to resolve: putty -ssh user@ Every time I want to connect to machine i need to check its ip first and then connect via putty, but when want to connect using hostname it fails and says not able to resolve. Is there a way around so that i can use a common hostname for Linux machine without worrying about its IP address which changes after every reboot? Thanks for reply. Regards, Ashutosh

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  • What are some useful SQL statements / usage patterns that should be known by all developers who may

    - by Jian Lin
    What are some useful SQL statements that should be known by all developers who may touch the Back end side of the project? (Update: just like in algorithm, we know there are sorting problems, shuffling problems, and we know some solutions to them. This question is aiming at the same thing). For example, ones I can think of are: Get a list of Employees and their boss. Or one with the employee's salary greater than the boss. (Self-join) Get a list of the most popular Classes registered by students, from the greatest number to the smallest. (Count, group by, order by) Get a list of Classes that are not registered by any students. (Outer join and check whether the match is NULL, or by Get from Classes table, all ClassIDs which are NOT IN (a subquery to get all ClassIDs from the Registrations table)) Are there some SQL statements that should be under the sleeve of all developers that might touch back end data?

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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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  • Restricting access to a website by IP address range / domain

    - by test
    Hi, I would like advice on the best way to restrict access to a weba pplication (using .net 2.0 and II6) based on the clients IP address. The two ways I am considering: 1) Through the server side code - check the client I.P against a list of IP addresses within the web.config. 2) Through IIS by creating a virtual directory and restricting the I.P addresses on this virtual directory. My question is if I go the virtual directory route there are a lot of users that access this website and I have read reverse domain lookups made during each client request can be very expensive on server resources. How much of a risj is this? Any other suggestions /ideas to doing this would be much appreciated Thanks advance,

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  • How to change FPU context in signal handler (C++/Linux)

    - by Henry Fané
    I wrote a signal handler to catch FPE errors. I need to continue execution even if this happens. I receive a ucontext_t as parameter, I can change the bad operand from 0 to another value but the FPU context is still bad and I run into an infinite loop ? Does someone already manupulate the ucontext_t structure on Linux ? I finally found a way to handle these situations by clearing the status flag of ucontext_t like this: ... const long int cFPUStatusFlag = 0x3F; aContext->uc_mcontext.fpregs->sw &= ~cFPUStatusFlag; ... 0x3F is negated to put 0 in the 6 bits of the status register of the FPU (x87). Doing this implies to check for FPE exceptions after calculation.

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  • How to test flash.message in a Grails webflow?

    - by callie16
    I'm using webflows in Grails and I'm currently writing tests for it. Now, inside I've got something that throws an error so I set a message to the flash scope before redirecting: ... if (some_condition) { flash.message = "my error message" return error() } ... Now, I know that when I'm going to display this in the GSP page, I access the flash message as <g:if test="${message}">... instead of the usual <g:if test="${flash.message}">... So anyway, I'm writing my test and I'm wondering how to test the content of the message? Usually, in normal actions in the controllers, I follow what's written in here . However, since this is a webflow, I can't seem to find the message even if I check controller.flash.message / controller.params.message / controller.message . I've also tried looking at the flow scope... Any ideas on how to see the message then? Thanks a bunch!

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  • How to 'insert if not exists' in MySQL?

    - by warren
    I started by googling, and found this article which talks about mutex tables. I have a table with ~14 million records. If I want to add more data in the same format, is there a way to ensure the record I want to insert does not already exist without using a pair of queries (ie, one query to check and one to insert is the result set is empty)? Does a unique constraint on a field guarantee the insert will fail if it's already there? It seems that with merely a constraint, when I issue the insert via php, the script croaks.

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  • Grails unit testing domain classes with Set properties - is this safe?

    - by Ali G
    I've created a domain class in Grails like this: class MyObject { static hasMany = [tags: String] // Have to declare this here, as nullable constraint does not seem to be honoured Set tags = new HashSet() static constraints = { tags(nullable: false) } } Writing unit tests to check the size and content of the MyObject.tags property, I found I had to do the following: assertLength(x, myObject.tags as Object[]) assertEquals(new HashSet([...]), myObject.tags) To make the syntax nicer for writing the tests, I implemented the following methods: void assertEquals(List expected, Set actual) { assertEquals(new HashSet(expected), actual) } void assertLength(int expected, Set set) { assertLength(expected, set as Object[]) } I can now call the assertLength() and assertEquals() methods directly on an instance of Set, e.g. assertLength(x, myObject.tags) assertEquals([...], myObject.tags) I'm new to Groovy and Grails, so unaware how dangerous method overloading like this is. Is it safe? If so, I'm slightly* surprised that these methods (or similar) aren't already available - please let me know if they are. * I can see how these methods could also introduce ambiguity if people weren't expecting them. E.g. assertLength(1, set) always passes, no matter what the content of set

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  • String pattern matching in Javascript

    - by kwokwai
    Hi all, I am doing some self learning about Patern Matching in Javascript. I got a simple input text field in a HTML web page, and I have done some Javascript to capture the string and check if there are any strange characters other than numbers and characters in the string. But I am not sure if it is correct. Only numbers, characters or a mixture of numbers and characters are allowed. var pattern = /^[a-z]+|[A-Z]+|[0-9]+$/; And I have another question about Pattern Matching in Javascript, what does the percentage symbol mean in Pattern matching. For example: var pattern = '/[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}/';

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  • Subversion: who am I logged in as?

    - by mikez302
    I am working on a collaborative project, and I would like to know who I am logged in as. Am I logged in as myself or someone else? If I check in my work, what username will be associated with the commit? I am never prompted for a username or password. When I commit changes, they just get committed under someone else's name. I would like them to be committed under my name. I tried the "--username" option as described on this page, but it didn't seem to work. I did a commit and it was done under the other user's name. I would like some way of knowing for sure that my changes will be committed under my name before I do the commit.

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  • question about asynchronous http

    - by rantravee
    Hi , I just want to check if I understood well the way asynchronous Http request work on Android. Suppose I make such a request and set a ResponseHandler<String> responseHandler to handle the response. By doing this is it possible to have the UI thread blocked waiting for the response ? The implication being that the code in the function: public String handleResponse(HttpResponse response) is also executed on the UI thread or is there silently spawned a thread that waits for the response and calls the handleResponse(HttpResponse response) function when the response arrives ?

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  • adodb .FIND question

    - by every_answer_gets_a_point
    i am using excel to connect to a mysql database i am doing this: rs.Find "rowid='105'" If Not rs.EOF Then cn.Execute "delete from batchinfo where rowid='105'" and it works well however, i need to be able to match data on multiple columns for example like this: rs. find "rowid='105'" and "something='sometext'" and "somethingelse='moretext'" i need to know whether or not rs.find matched ALL of the data. how can i do this? according to this i can't: http://articles.techrepublic.com.com/5100-10878_11-1045830.html# however perhaps there's a way i can rs.execute "some select statement" can someone help with this? would this do the trick for me and then i would check EOF: rs.Filter "LastName='Adams' and FirstName='Lamont'"

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  • Get value from ajax-loaded form before submitting

    - by ldvldv
    Hi, I have an app that loads an ajax form when a button is clicked. I then want to check a value in that ajax loaded form called "comment_content" so that I don't send an ajax request if the comment_content is empty. I can capture the form submission using the live method, however, I can't capture the form element because it needs an element. I was looking at livequery but was wondering if there is a more efficient way by using live or if that I shouldn't even bother? Your help is very much appreciated. $("#comment_submit").live('click', function(){ var comment = $("#comment_content").html(); if(comment == ""){ $("#notice").html("").stop(true, true); $("#notice").append("<p>Are you going to write something in that comment?</p>"); $('#notice').slideDown().delay(2000).slideUp(); return false; } return true; });

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