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  • Google Datastore low-level api query by key property

    - by Keyur
    I'm using the low-level google datastore api and I want to query by the key property and another property (let's call it category). I need to query based on a list of keys for which I'll use the IN operator. I know that the max. number of values you can provide for the IN clause is 30. I have 2 questions: Does the limit of 30 IN values apply to the key property as well? Do I need to create a composite index on {_key_ + category} or just on {category} for this query? Thanks, Keyur

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  • When/Why ( if ever ) should i think about doing Generic Programming/Meta Programming

    - by hotadvice
    Hi there IMHO to me OOPS, design patterns make sense and i have been able to apply them practically. But when it comes to "generic programming /meta programming" of the Modern C++ kind, i am left confused. -- Is it a new programming/design paradigm ? -- Is it just limited to "library development"? If not, What design/coding situations call for using meta programming/generic programming. -- Does using templates mean i am doing generic programming? I have googled a lot on this topic but do not grasp the BIG PICTURE fully. Also see this post. After reading dicussions here under, up till now, I am sure ( might still not be correct): a) Generic programming and meta programming are two different concepts.

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  • How to get Combobox.SelectedItem Return string value of what is selected instead of Service Reference Class?

    - by Rohit Acharya
    I currently have the following code for a button. The message box shows SilverlightApplication2.ServiceReference2.Employee instead of the text string selected by the user. The combobox items are being populated by a WCF service. As a result I am unable to pass it to the Async call. How do I get the string of what user selected? private void btnAdd_Click(object sender, RoutedEventArgs e) { object selectedItem = comobo1.SelectedItem.ToString(); MessageBox.Show(selectedItem.ToString()); var proxy = new Service1Client(); proxy.GetAllEmployeesCompleted += proxy_GetAllEmployeesCompleted; proxy.GetAllEmployeesAsync(selectedItem.ToString()); }

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  • Alternative to c++ static virtual methods

    - by Jaime Pardos
    In C++ is not possible to declare a static virtual function, neither cast a non-static function to a C style function pointer. Now, I have a plain ol' C SDK that uses function pointers heavily. I have to fill a structure with several function pointers. I was planning to use an abstract class with a bunch of static pure virtual methods, and redefine them in derived classes and fill the structure with them. It wasn't until then that I realized that static virtual are not allowed in C++. Is there any good alternative? The best I can think of is defining some pure virtual methods GetFuncA(), GetFuncB(),... and some static members FuncA()/FuncB() in each derived class, which would be returned by the GetFuncX(). Then a function in the abstract class would call those functions to get the pointers and fill the structure.

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  • What is the worst class/variable/function name you have ever encountered

    - by Chris Noe
    Naming things well is arguably Job 1 for professional programmers. Yet we have all suffered from some bad naming choices from time to time. So just to vent a little, what are some doozies that you may have run across? Just to get things started: One of our original developers wasn't sure what to call a secondary key - on what turned out to be a primary table for this app - so he called it: DL2WhateverTheHellThatIs. Unfortunately this system generates entity mappings from the XML, and attributes defined there result in classes, methods, and constants that are referenced through-out the app. To this day it is very hard to find a source file that does not reference this, er, thing! A few actual examples: DL2WhateverTheHellThatIsBean cos = (DL2WhateverTheHellThatIsBean)itr.next(); String code = getDL2WhateverTheHellThatIs().getCode(); From from = new From("DL2WhateverTheHellThatIs"); String filter = "_dL2WhateverTheHellThatIs._code"; (Very difficult to refactor)

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  • how to draw a line between two labels in a panel where labels are added during runtime

    - by vybhav
    A panel contains two labels which are generated by mouse clicks on the panel. I want to connect these two labels by drawing a line between them probably by dragging the mouse pointer from one label to another. There are two events here - one is clicking on the panel to generate the labels and the second is connecting these two labels (mouse pressed, mouse dragged and mouse released events). Both these event need to call the repaint() method but for different purposes. But there can be only one paint() method. The problem is when I connect these two labels, the line comes up but the rest of the components on the panel disappear.

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  • Testing Java Classes with JMeter

    - by Martin Dürrmeier
    I'd like to test a Java Service Call. My first attempt was to use the "Java Request Sampler" The docu says This sampler lets you control a java class that implements the JavaSamplerClient interface. I'm not sure how to get the org.apache.jmeter.protocol.java.sampler.JavaSamplerClient Interface as there is no Maven Artifact nor provided binaries on the JMeter side. Just a JMeter Maven Plugin (which is not what I'm looking for). I could install the needed binaries in my local Maven Repository, I Just don't know where they are available. Wondering if anybody at all is using the "Java Request Sampler" ? P.S. Maybe I should try the JUnit Sampler

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  • JavaScript "confirm" on SelectedIndexChange of RadioButtonList

    - by Brian David Berman
    I have a RadioButtonList control and I would like to do a Javascript "confirm" when a user tries to change the index. Currently AutoPostBack is set to TRUE. I can, of course, just call __doPostBack from within a javascript function, etc. I tried a few things with jQuery but you have to worry about mousedown vs. click and then there is always the fact that you can click the checkbox label to select it, etc. Anyone have a nice solution for this? To be clear, I am looking for a way to prompt the user with a confirm box prior to their selection being made and triggering a postback.

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  • Need some resoultion. Javascript function not being called in click event in jquery.

    - by Shantanu Gupta
    I am trying to call my function named isUrgencyTypeValid from my javascript code but it is not working. Please check what is the problem in my code. Alert should get displayed which is not being displayed My javascript function is not being called. HTML Code <td colspan="2" align="center"><input id="btnSubmit" type="submit" value="submit" runat="server"/></td></tr> jQuery Call function $("#btnSubmit").bind("click",function(){ alert(); // this is running isUrgencyTypeValid(); }); javascript implemented function function isUrgencyTypeValid() { alert("asd"); var i=0; for(i=0;i<$("radio[name='urgencyType']").length;i++) { if($("radio[name='urgencyType']")[i].checked) { alert($("radio[name='urgencyType']")[i].value); return true; } return false; } More description about my form is here <form runat="server" name="myPage"> <table style="width: 100%;" cellpadding="5" cellspacing="5"> <caption> Computer Support / Service Request </caption> <tr><td>First Name</td> <td><input id="txtFirstName" type="text" value="First Name" runat="server"/><span class="error"></span></td></tr> <tr> <td>Last Name</td> <td><input id="txtLastName" type="text" value="Last Name" runat="server"/><span class="error"></span></td></tr> <tr> <td>Email Address</td> <td><input id="txtEmailAddress" type="text" value="Email Address" runat="server"/><span class="error"></span></td></tr> <tr> <td>Phone No</td> <td><input id="txtPhoneNo" type="text" value="Phone No" runat="server" /><span class="error"></span></td></tr> <tr> <td>Do you have text messaging</td> <td> <span>Yes</span><input id="rdoYes" value="Yes" type="radio" runat="server"/> <span>No</span><input id="rdoNo" value="No" type="radio" runat="server"/><span class="error"></span> </td></tr> <tr> <td>Description of request*: </td> <td><textarea id="txtDescription" cols="50" rows="10" runat="server"></textarea><span class="error"></span><span id="lengthCount"></span></td></tr> <tr> <td>Urgency of this support request:</td> <td> <input id="rdoAnyTime" name="urgencyType" value="Anytime" type="radio" runat="server"/><span>Anytime</span><br /> <input id="rdoCplDays" name="urgencyType" value="In the next couple of days" type="radio" runat="server"/><span>In the next couple of days</span><br /> <input id="rdoToday" name="urgencyType" value="Today" type="radio" runat="server"/><span>Today</span><br /> <input id="rdoUrgent" name="urgencyType" value="This is extremely urgent...I cannot wait!" type="radio" runat="server"/><span>This is extremely urgent...I cannot wait!</span><br /> <input id="rdoTalkSometime" name="urgencyType" value="Please contact me and we'll talk about it" type="radio" runat="server"/><span>Please contact me and we'll talk about it</span><br /><span class="error"></span> </td></tr> <tr> <td colspan="2" align="center">Captcha To Be implemented.</td></tr> <tr> <td></td> <td><input id="chkRequestCopy" type="checkbox" runat="server"/>Please send me a copy of this service request</td></tr> <tr> <td colspan="2" align="center"><input id="btnSubmit" type="submit" value="submit" runat="server"/></td></tr> </table> </form>

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  • How to handle redirection in an Ajax based application

    - by nimo
    hi all, I'm developing a Ajax based php application. As anybody knows, I'm checking whether user is logged in every php file as the first statement. And there are two ways that I should response in an event of logging failure, server redirect to the login page using header(url). CASE: If user directly enter a particular URL passing url in Ajax response asking client side page redirection or notification CASE: If user trying to perform some action through a Ajax request So my question is how can identify whether request coming from client side is a Ajax call or not ? If I know that I can handle my response accordingly. OR Is there a better way of handling above scenario ? Thank You

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  • DEADLOCK_WRAP error when using Berkeley Db in python (bsddb)

    - by JiminyCricket
    I am using a berkdb to store a huge list of key-value pairs but for some reason when i try to access some of the data later i get this error: try: key = 'scrape011201-590652' contenttext = contentdict[key] except: print the error <type 'exceptions.KeyError'> 'scrape011201-590652' in contenttext = contentdict[key]\n', ' File "/usr/lib64/python2.5/bsddb/__init__.py", line 223, in __getitem__\n return _DeadlockWrap(lambda: self.db[key]) # self.db[key]\n', 'File "/usr/lib64/python2.5/bsddb/dbutils.py", line 62, in DeadlockWrap\n return function(*_args, **_kwargs)\n', ' File "/usr/lib64/python2.5/bsddb/__init__.py", line 223, in <lambda>\n return _DeadlockWrap(lambda: self.db[key]) # self.db[key]\n'] I am not sure what DeadlockWrap is but there isnt any other program or process accessing the berkdb or writing to it (as far as i know,) so not sure how we could get a deadlock, if its referring to that. Is it possible that I am trying to access the data to rapidly? I have this function call in a loop, so something like for i in hugelist: #try to get a value from the berkdb #do something with it I am running this with multiple datasets and this error only occurs with one of them, the largest one, not the others.

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  • openCV usage cvFindDominantPoints

    - by rsinha
    Hi, Does anyone know how to use the cvFindDominantPoints API of openCV? I basically have a 1 channel, binary image from which I get a set of contours. Judging from the image, I seem to be getting the correct contours. Now, I am selecting one of these contours to get dominant points of. This contour has about 60 vertices. However, the API call to cvFindDominantPoints is giving me a sequence of points (about 15) that does not even lie on the contour. It is quite far from it. Any insight? my usage: CvSeq *dominantpoints = cvFindDominantPoints(targetSeq, tristorage, CV_DOMINANT_IPAN, 7, 9, 9, 150);

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  • UITableView becomes invisible after changing data in it

    - by Alexander Shemshurenko
    Hi I have application with TabBar that control several views. In one view i control connection to different servers.Each server provides different set of items. I display these items in UITableView on other view. I create table view like this UITableView * aTableView = [[UITableView alloc] initWithFrame:CGRectMake(X,Y,Width,Height) style:UITableViewStyleGrouped]; [[self view] addSubview:aTableView]; aTableView.da taSource = self; The problem is that Table view displayed ok first time , but if i go back to view number one and change server(changing list of items that should be displayed in table view), table view becomes invisible for some reason. If i tap on the screen in place where it should be, its becomes visible again. Ive tried to call to reloadData and setNeedDisplay in viewWillAppear of the UIViewController that hosts this table view, but without success. Any advice? Thanks

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  • How to track different button clicks with Google Analytics and AJAX?

    - by citronas
    I have several pages, let's call them A, B and C. Each of these pages has a form where the user can type in some information and click a button to send those information to the server. This button click is performed in an UpdatePanel to prevent a full postback. A customer of ours now wants to know how many % of the using visiting each site (A, B and C have different URLs) use this form. (Meaning I need seperate values for A, B and C) How to I track this in Google Analytics? It seems that I have to create a conversion(??) for each page. Is that correct? How must I modify the existing web application to let Google Analytics know, that a user submitted the form. (without the need to redirect thank to xy amount of different thank you pages) The only piece of information I've found so far is this: http://www.google.com/support/googleanalytics/bin/answer.py?hl=en&answer=55519 Unfortunately, this FAQ entry does not cover my answer.

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  • WordPress notifier - replicate built-in function whereby if update is available, an icon appears in

    - by Richard Tape
    Hello! First time here, so please be gentle. Does anyone know how to replicate the built-in functionality of WordPress whereby the admin is informed of when updates for plugins are available - i.e. when one (more more) is available, an icon appears over the plugins menu which contains the number of available updates. The plugin that I am writing could really benefit, from a UI perspective, with having a feature very similar to this. Does anyone know if there are any hooks which I can use, or any function which I can call? Any help on this is greatly appreciated! Thank you very much in advance, Richard

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  • Python How to make a cross-module function?

    - by Evan
    I want to be able to call a global function from an imported class, for example In file PetStore.py class AnimalSound(object): def __init__(self): if 'makenoise' in globals(): self.makenoise = globals()['makenoise'] else: self.makenoise = lambda: 'meow' def __str__(self): return self.makenoise() Then when I test in the Python Interpreter >>> def makenoise(): ... return 'bark' ... >>> from PetStore import AnimalSound >>> sound = AnimalSound() >>> sound.makenoise() 'meow' I get a 'meow' instead of 'bark'. I have tried using the solutions provided in python-how-to-make-a-cross-module-variable with no luck.

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  • Major performance difference between two Oracle database instances

    - by jrdioko
    I am working with two instances of an Oracle database, call them one and two. two is running on better hardware (hard disk, memory, CPU) than one, and two is one minor version behind one in terms of Oracle version (both are 11g). Both have the exact same table table_name with exactly the same indexes defined. I load 500,000 identical rows into table_name on both instances. I then run, on both instances: delete from table_name; This command takes 30 seconds to complete on one and 40 minutes to complete on two. Doing INSERTs and UPDATEs on the two tables has similar performance differences. Does anyone have any suggestions on what could have such a drastic impact on performance between the two databases?

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  • In PHP, is it possible to create an instance of an class without calling class's constructor ?

    - by Rachel
    By any means, is it possible to create an instance of an php class without calling its constructor ? I have Class A and while creating an instance of it am passing file and in constructor of Class A am opening the file. Now in Class A, there is function which I need to call but am not required to pass file and so there is not need to use constructor functionality of opening file as am not passing file. So my question is, Is it possible by any means to create an instance of an PHP class without calling its constructor ?

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  • Home Pages in ASP.NET MVC

    - by Maxim Z.
    I'm trying out ASP.NET MVC, but, after reading a huge tutorial, I'm slightly confused. I understand how Controllers have Actions that URLs are routed to, but how do home pages work? Is the home page its own controller (e.g. "Home") that has no actions? This sounds correct, but how is it functionality implemented without Actions (no Actions means no methods that call the View Engine)? In other words, my question is this: how are home pages implemented (in terms of Controllers and Views)? Could you please provide sample code?

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  • Compiler doesn't find methods from base class

    - by Paul
    I am having a problem with my virtual methods in a derived class. Here are my (simplified) C++ classes. class Base virtual method accept( MyVisitor1* v ) { /*implementation is here*/ }; virtual method accept( MyVisitor2* v ) { /*implementation is here*/ }; virtual method accept( MyVisitor3* v ) { /*implementation is here*/ }; class DerivedClass virtual method accept( MyVisitor2* v ) { /*implementation is here*/ }; The following use causes VS 2005 to give: "error C2664: 'DerivedClass::accept' : cannot convert parameter 1 from 'Visitor1*' to 'Visitor2 *'". DerivedClass c; MyVisitor1 v1; c.accept(v1); I was expecting the compiler to find and call Base::accept(MyVisitor1) for my DerivedClass as well. Obviously this is not working, but I don't understand why. Any ideas? Thanks, Paul

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  • Can an Excel VBA UDF called from the worksheet ever be passed an instance of any Excel VBA object mo

    - by jtolle
    I'm 99% sure that the answer is "no", but I'm wondering if someone who is 100% sure can say so. Consider a VBA UDF: Public Function f(x) End Function When you call this from the worksheet, 'x' will be a number, string, boolean, error, array, or object of type 'Range'. Can it ever be, say, an instance of 'Chart', 'ListObject', or any other Excel-VBA object model class? (The question arose from me moving to Excel 2007 and playing with Tables, and wondering if I could write UDFs that accept them as parameters instead of Ranges. The answer to that seems to be no, but then I realized I didn't know for sure in general.)

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  • XSL: Get variable data without exslt:node-set

    - by Louis W
    Using native XSL lib in PHP. Is it possible to get a node value inside a variable without having to call it through exslt:node-set every time.... it long and ugly. <xsl:variable name="mydata"> <foo>1</foo> <bar>2</bar> </xsl:variable> <!-- How currently being done --> <xsl:value-of select="exslt:node-set($mydata)/foo" /> <!-- I want to be able to do this --> <xsl:value-of select="$mydata/foo" />

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  • UISlider disappearing when calling setValue with 0

    - by Kai
    I have several UISliders in my application which all work fine until I call the following code: ... frame = CGRectMake(43, 210, 201, 23); mySlider = [[UISlider alloc] initWithFrame:frame]; [mySlider addTarget:self action:@selector(sliderUpdate:) forControlEvents:UIControlEventValueChanged]; mySlider.minimumValue = 0.0; mySlider.maximumValue = 1.0; mySlider.continuous = YES; tempNum = [myArray objectAtIndex:2]; mySlider.value = [tempNum floatValue]; // only breaks if value is 0 [self.view addSubview:mySlider]; ... For some reason the slider doesn't show up unless mySlider.value is set to greater than 0. The only workaround I've found so far is to set it to an extremely small value (such as 0.000000001), which makes the slider appear as expected. Does anyone have any idea why this might be happening and how it can be fixed?

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  • MVP - asp.net - passing information via views - confused

    - by ekynox
    Hi, I've just started to play around with MVP in asp.net. One thing I quite cant figure out is how do I pass information, i.e. an integer variable from one view(webform) to another. Let's I have a customerlistView which is mapped to a customerlist.aspx page. From it I select a customer and it's record id. Say I want to display the customer's details in another view (i.e customerDetailView, customerdetail.aspx). How do I achieve that ? Does that mean customerlistView would call the presenter of the customerdetail and cause a page redirect ? Any ideas ? thanks

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  • Jsonp request using jquery to fetch bing web results

    - by Blankman
    using this as a guide: http://msdn.microsoft.com/en-us/library/dd250846.aspx can someone help me with the jquery call? Do I actually pass in the javascript code for the callback, or just the name of the function? BingSearch = function($bingUrl, $bingAppID, $keyword, $callBack) { $bingUrl = $bingUrl + "?JsonType=callback&JsonCallback=" + $callBack + "&Appid=" + $bingAppID + "&query=" + encodeURI($keyword) + "&sources=web"; $.ajax({ dataType: 'jsonp', jsonp: $callBack, url: $bingUrl, success: function(data) { alert('success'); $callBack(data); }, error: function(XMLHttpRequest, textStatus, errorThrown) { alert("error: " + textStatus); } }); };

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