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Articles indexed in April 2012

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  • How do people prove the correctness of Computer Vision methods?

    - by solvingPuzzles
    I'd like to pose a few abstract questions about computer vision research. I haven't quite been able to answer these questions by searching the web and reading papers. How does someone know whether a computer vision algorithm is correct? How do we define "correct" in the context of computer vision? Do formal proofs play a role in understanding the correctness of computer vision algorithms? A bit of background: I'm about to start my PhD in Computer Science. I enjoy designing fast parallel algorithms and proving the correctness of these algorithms. I've also used OpenCV from some class projects, though I don't have much formal training in computer vision. I've been approached by a potential thesis advisor who works on designing faster and more scalable algorithms for computer vision (e.g. fast image segmentation). I'm trying to understand the common practices in solving computer vision problems.

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  • How to sum up a fetched result's number property based on the object's category?

    - by mr_kurrupt
    I have a NSFetchRequest that is returning all my saved objects (call them Items) and storing them in an NSMutableArray. Each of these Items have a category, an amount, and some other properties. My goal is to check the category of each Item and store the sum of the amounts for objects of the same category. So if I had these Items: Red; 10.00 Blue; 20.00 Green; 5.00 Red; 5.00 Green; 15.00 then I would have an array or other type of container than has: Red; 15.00 Blue; 20.00 Green; 20.00 What would be the best way to organize the data in such a manner? I was going to create a object class (call it Totals) that just has the category and amount. As I traverse through the fetch results in a for-loop, add Items with the same category in a Totals object an store them in a NSMutableArray. The problem I ran into with that is that I'm not sure how to check if an array contains a Totals object with a specific property. Specifically, a category that already exists. So if 'Red' exists, add the amount to it, otherwise create a new Totals object with category 'Red' and a the first Item's amount. Thanks.

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  • Suds array of arrays not nesting

    - by joshcartme
    Let me preface this by saying that I am still pretty new to SOAP and how things should work. I'm working with the Vertical Response API. I'm having trouble getting suds to construct the xml correctly for a request. Here is some code: from suds.client import Client url = 'https://api.verticalresponse.com/wsdl/1.0/VRAPI.wsdl' client = Client(url) vr = client.service ... test_list = ( ( { 'name' : 'email_address', 'value' : login['username'], }, { 'name' : 'First_Name', 'value' : 'VR_User', } ), ( { 'name' : 'email_address', 'value' : '[email protected]', }, { 'name' : 'First_Name', 'value' : login['username'], }, ), ) # sid and cid are correctly retrieved prior to this point print "Sending test message..." vr.sendEmailCampaignTest({ 'session_id' : sid, 'campaign_id' : cid, 'recipients' : test_list, }) In this context login['username'] is just an email address. That code raises this error: suds.WebFault: Server raised fault: 'Application failed during request deserialization: Too many elements in array. 4 instead of claimed 2 (2) Here is the the definition of sendEmailCampaignTest: http://developers.verticalresponse.com/api/soap/methods/campaigns/sendemailcampaigntest/ Here is the xml that logging outputs (I removed the session_id and list_id for display here): DEBUG:suds.client:headers = {'SOAPAction': u'"VR/API/1_0#sendEmailCampaignTest"', 'Content-Type': 'text/xml; charset=utf-8'} ERROR:suds.client:<?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope xmlns:ns3="http://api.verticalresponse.com/1.0/VRAPI.xsd" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:ns0="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns1="http://www.w3.org/2001/XMLSchema" xmlns:ns2="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns4="VR/API/1_0" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Header/> <ns0:Body> <ns4:sendEmailCampaignTest> <args xsi:type="ns3:sendEmailCampaignTestArgs"> <session_id xsi:type="ns1:string">redacted</session_id> <campaign_id xsi:type="ns1:int">redacted</campaign_id> <recipients xsi:type="ns3:ArrayOfNVDictionary" ns2:arrayType="ns3:NVDictionary[2]"> <item> <name xsi:type="ns1:string">email_address</name> <value xsi:type="ns1:string">[email protected]</value> </item> <item> <name xsi:type="ns1:string">First_Name</name> <value xsi:type="ns1:string">VR_User</value> </item> <item> <name xsi:type="ns1:string">email_address</name> <value xsi:type="ns1:string">[email protected]</value> </item> <item> <name xsi:type="ns1:string">First_Name</name> <value xsi:type="ns1:string">[email protected]</value> </item> </recipients> </args> </ns4:sendEmailCampaignTest> </ns0:Body> </SOAP-ENV:Envelope> DEBUG:suds.client:http failed: <?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body><SOAP-ENV:Fault><faultcode>SOAP-ENV:Client</faultcode><faultstring>Application failed during request deserialization: Too many elements in array. 4 instead of claimed 2 (2) </faultstring></SOAP-ENV:Fault></SOAP-ENV:Body></SOAP-ENV:Envelope> a ruby script (provided by Vertical Response) that does the same things as the script I am working on in python outputs the following xml (I removed the session_id and list_id): <?xml version="1.0" encoding="utf-8" ?> <env:Envelope xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <env:Body> <n1:sendEmailCampaignTest xmlns:n1="VR/API/1_0" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <args xmlns:n2="http://api.verticalresponse.com/1.0/VRAPI.xsd" xsi:type="n2:sendEmailCampaignTestArgs"> <session_id xsi:type="xsd:string">redacted</session_id> <campaign_id xsi:type="xsd:int">redacted</campaign_id> <recipients xmlns:n3="http://schemas.xmlsoap.org/soap/encoding/" xsi:type="n3:Array" n3:arrayType="n2:NVDictionary[2]"> <item xsi:type="n3:Array" n3:arrayType="n2:NVPair[2]"> <item> <name xsi:type="xsd:string">email_address</name> <value href="#id9496430"></value> </item> <item> <name xsi:type="xsd:string">First_Name</name> <value xsi:type="xsd:string">VR_User</value> </item> </item> <item xsi:type="n3:Array" n3:arrayType="n2:NVPair[2]"> <item> <name xsi:type="xsd:string">email_address</name> <value xsi:type="xsd:string">[email protected]</value> </item> <item> <name xsi:type="xsd:string">First_Name</name> <value href="#id9496430"></value> </item> </item> </recipients> </args> </n1:sendEmailCampaignTest> <value id="id9496430" xsi:type="xsd:string" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">[email protected]</value> </env:Body> </env:Envelope> I understand that the error is in the construction of recipients. It should contain two items, each that contain two items but my python script using suds is setting it up to contain four unnested items. So my question is how can I get suds to correctly construct the xml?

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  • segmented reduction with scattered segments

    - by Christian Rau
    I got to solve a pretty standard problem on the GPU, but I'm quite new to practical GPGPU, so I'm looking for ideas to approach this problem. I have many points in 3-space which are assigned to a very small number of groups (each point belongs to one group), specifically 15 in this case (doesn't ever change). Now I want to compute the mean and covariance matrix of all the groups. So on the CPU it's roughly the same as: for each point p { mean[p.group] += p.pos; covariance[p.group] += p.pos * p.pos; ++count[p.group]; } for each group g { mean[g] /= count[g]; covariance[g] = covariance[g]/count[g] - mean[g]*mean[g]; } Since the number of groups is extremely small, the last step can be done on the CPU (I need those values on the CPU, anyway). The first step is actually just a segmented reduction, but with the segments scattered around. So the first idea I came up with, was to first sort the points by their groups. I thought about a simple bucket sort using atomic_inc to compute bucket sizes and per-point relocation indices (got a better idea for sorting?, atomics may not be the best idea). After that they're sorted by groups and I could possibly come up with an adaption of the segmented scan algorithms presented here. But in this special case, I got a very large amount of data per point (9-10 floats, maybe even doubles if the need arises), so the standard algorithms using a shared memory element per thread and a thread per point might make problems regarding per-multiprocessor resources as shared memory or registers (Ok, much more on compute capability 1.x than 2.x, but still). Due to the very small and constant number of groups I thought there might be better approaches. Maybe there are already existing ideas suited for these specific properties of such a standard problem. Or maybe my general approach isn't that bad and you got ideas for improving the individual steps, like a good sorting algorithm suited for a very small number of keys or some segmented reduction algorithm minimizing shared memory/register usage. I'm looking for general approaches and don't want to use external libraries. FWIW I'm using OpenCL, but it shouldn't really matter as the general concepts of GPU computing don't really differ over the major frameworks.

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  • removing duplicate strings from a massive array in java efficiently?

    - by Preator Darmatheon
    I'm considering the best possible way to remove duplicates from an (Unsorted) array of strings - the array contains millions or tens of millions of stringz..The array is already prepopulated so the optimization goal is only on removing dups and not preventing dups from initially populating!! I was thinking along the lines of doing a sort and then binary search to get a log(n) search instead of n (linear) search. This would give me nlogn + n searches which althout is better than an unsorted (n^2) search = but this still seems slow. (Was also considering along the lines of hashing but not sure about the throughput) Please help! Looking for an efficient solution that addresses both speed and memory since there are millions of strings involved without using Collections API!

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  • How to link more than one object at a time in Xcode 4.2?

    - by Beppe
    I'm probably missing the basics here... Is there a way to link more than one object to a method at a time using Interface Builder in Xcode 4.2? I set tons of UIButtons in my UIView. All of them call just one method (let's say - (IBAction)buttonPushed:(UIButton *)aButton) that should do something different depending on the sender. I can't figure out a way to link them all with my method at a time. Any advice will be very appreciated... N.B. I'm using Xcode 4.2 on Snow Leopard, without storyboard.

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  • HTA value update freezes when file copy starts

    - by Matt Hamende
    Creating an HTA that will automate the installation of several applications it starts by checking for the existence of certain files then copies a large folder to local from a flash drive if it doesn't exist, I have a textbox I'm using to update the current status of the script, but it just seems to freeze and never updates, I haven't had any luck with any of the artificial sleep functions either. here's the segment If Not objFSO.FileExists(Office10Dir) Then MsgBox("Excel is missing") BasicTextBox.Value = "Office14 Not Detected, Copying Source Files to Local" Dim objFS, objFolder Dim OfficeTemp OfficeTemp = "C:\OfficeTemp" Set objFS = CreateObject("Scripting.FileSystemObject") Set objFolder = objFS.CreateFolder(OfficeTemp) objFS.CopyFolder "OfficeTemp", "C:\OfficeTemp" BasicTextBox.Value = "Local Temp Directory Created" ELSE MsgBox("Excel is Installed") END IF All i see is the "Local Temp Directory Created" message once file copy is complete

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  • refactor this javascript code

    - by nathanvda
    I have two click-events, that are nearly similar, but not quite. I am wondering how to refactor them best: $('.remove_fields.dynamic').live('click', function(e) { var $this = $(this); var after_removal_trigger_node = $this.closest(".nested-fields").parent(); trigger_removal_callback($this); e.preventDefault(); $this.closest(".nested-fields").remove(); trigger_after_removal_callback(after_removal_trigger_node); }); $('.remove_fields.existing').live('click', function(e) { var $this = $(this); var after_removal_trigger_node = $this.closest(".nested-fields").parent(); trigger_removal_callback($this); e.preventDefault(); $this.prev("input[type=hidden]").val("1"); $this.closest(".nested-fields").hide(); trigger_after_removal_callback(after_removal_trigger_node); }); As you can tell there is a fair bit of overlap. I am wondering what the best/nicest way would be to refactor this code.

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  • Building argv and argc

    - by Wylie Coyote SG.
    I'm a student programmer using Qt to build a GUI application for work. The primary purpose of this application is to open some of our old style files, allows better editing and then save the file in a new format and file extension. Recently I have been asked to allow this conversion to take place from a terminal. While I do know what argv and argc are along with what they represent I am unsure how to accomplish what they want. For instance how to handle relative paths vs. absolute... maybe how to get absolute from relative; perhaps none of that is even needed. My programming experience has been primarily with guis so this is a little new to me. Users would like the following to be ran from the terminal application -o /fileLocation /fileDestination template(to determine new format) I began to use for loops and if statements to begin accomplishing this when I relized that I might be taking the worng approach to all of this. I WOULD ALSO BE REALLY INTERESTED IF QT HAS SOMETHING FOR THIS! Here is what I have began coming up with: int main(int argc, char *argv[]) { if(argc > 1) { for(int i = 0; i < argc; i++) { if(argv[i] == "-c") { QString fileName = QString::fromStdString(argv[i+1]); QString fileDestination = QString::fromStdString(argv[i+2]); QString templateName = QString::fromStdString(argv[i+3]); QFile fileToConvert(fileName); if(fileToConvert.open(QFile::ReadOnly)) { //do stuff Thanks for reading my post and a big thanks for any contributions you make to helping me overcome this issue.

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  • Android - exception from an AsynchTask call

    - by GeekedOut
    I have an Activity that makes a remote server call and tries to populate a list. The call to the server works fine, and the call returns some JSON which is good. But then the system throws this exception: 04-06 18:43:19.626: D/AndroidRuntime(2564): Shutting down VM 04-06 18:43:19.626: W/dalvikvm(2564): threadid=1: thread exiting with uncaught exception (group=0x409c01f8) 04-06 18:43:19.686: E/AndroidRuntime(2564): FATAL EXCEPTION: main 04-06 18:43:19.686: E/AndroidRuntime(2564): java.lang.NullPointerException 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.AbsListView.obtainView(AbsListView.java:2033) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.ListView.measureHeightOfChildren(ListView.java:1244) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.ListView.onMeasure(ListView.java:1155) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.View.measure(View.java:12723) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1369) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.LinearLayout.measureVertical(LinearLayout.java:660) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.View.measure(View.java:12723) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.View.measure(View.java:12723) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.LinearLayout.measureVertical(LinearLayout.java:812) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.LinearLayout.onMeasure(LinearLayout.java:553) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.View.measure(View.java:12723) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4698) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.widget.FrameLayout.onMeasure(FrameLayout.java:293) 04-06 18:43:19.686: E/AndroidRuntime(2564): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2092) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.View.measure(View.java:12723) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1064) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.os.Handler.dispatchMessage(Handler.java:99) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.os.Looper.loop(Looper.java:137) 04-06 18:43:19.686: E/AndroidRuntime(2564): at android.app.ActivityThread.main(ActivityThread.java:4424) 04-06 18:43:19.686: E/AndroidRuntime(2564): at java.lang.reflect.Method.invokeNative(Native Method) 04-06 18:43:19.686: E/AndroidRuntime(2564): at java.lang.reflect.Method.invoke(Method.java:511) 04-06 18:43:19.686: E/AndroidRuntime(2564): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 04-06 18:43:19.686: E/AndroidRuntime(2564): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 04-06 18:43:19.686: E/AndroidRuntime(2564): at dalvik.system.NativeStart.main(Native Method) Why would this happen? It doesn't point to any of my code so its a bit strange. the protected void onPostExecute(String result) never gets called on the callback. Thanks!

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  • Adding and sorting a linked list in C

    - by user1202963
    In my assignment, I have to write a function that takes as arguments a pointer to a "LNode" structure and an integer argument. Then, I have to not only add that integer into the linked list, but also put place it so that the list is in proper ascending order. I've tried several various attempts at this, and this is my code as of posting. LNode* AddItem(LNode *headPtr, int newItem) { auto LNode *ptr = headPtr; ptr = malloc(sizeof(LNode)); if (headPtr == NULL) { ptr->value = newItem; ptr->next = headPtr; return ptr; } else { while (headPtr->value > newItem || ptr->next != NULL) { printf("While\n"); // This is simply to let me know how many times the loop runs headPtr = headPtr->next; } ptr->value = newItem; ptr->next = headPtr; return ptr; } } // end of "AddItem" When I run it, and try to insert say a 5 and then a 3, the 5 gets inserted, but then the while loop runs once and I get a segmentation fault. Also I cannot change the arguments as it's part of a skeletal code for this project. Thanks to anyone who can help. If it helps this is what the structure looks like typedef struct LNode { int value; struct LNode *next; } LNode;

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  • Passing PHP variables trough functions?

    - by Mateus Nunes
    I'm facing some troubles to pass php variables value trough functions,every time i try to use a variable inside one of my functions its value becomes nil,let me be more specific.I have the following code in my php file: $myvar = $Session['username']; function updateuserinformation(){ if(trim($_FILES["fileUpload"]["tmp_name"]) != ""){ $images = $_FILES["fileUpload"]["tmp_name"]; $new_images = "thumbnails_".$_FILES["fileUpload"]["name"]; copy($_FILES["fileUpload"]["tmp_name"],"Photos/".$_FILES["fileUpload"]["name"]); $width=200; //*** Fix Width & Heigh (Autu caculate) ***// $size=GetimageSize($images); $height=round($width*$size[1]/$size[0]); $images_orig = ImageCreateFromJPEG($images); $photoX = ImagesX($images_orig); $photoY = ImagesY($images_orig); $images_fin = ImageCreateTrueColor($width, $height); ImageCopyResampled($images_fin, $images_orig, 0, 0, 0, 0, $width+1, $height+1, $photoX, $photoY); ImageJPEG($images_fin,"Photos/".$new_images); ImageDestroy($images_orig); ImageDestroy($images_fin); print $data["foo"]; echo"$myvar"; mysql_query("UPDATE users SET userpictureaddress = 'http://www.litsdevelopment.com/litsapplication/userimages/MATEUS' WHERE username = 'Mateus' "); } } I trying to use the $myvar value in my function but every time i run the code it just doesn't work,i've already tried global,globals,arrays and session for nothing worked.Of corse i'm making a little mistake in some part of it,but anyone know what is the correct way to do this?

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  • Click HTML except one element [ WITHOUT JQuery ]

    - by Tomirammstein
    I show us the code: (function (){ var element = document.getElementById('bar'), hideElement = document.getElementById('foo'), var html = document.getElementsByTagName('html')[0]; tool.onclick = function() { hideElement.style.display = 'block'; html.onclick = function() { hideElement.style.display = 'none'; } } })(); This piece of code work's fine, but, after clicking html, I can not reopen the hidden element. I want to click the html element and give display:none to hideElement, then to click the element id="bar", give to the hidden element display:block, but instead of click the element foo, click the html element. What I can do? Oh, i need help WITHOUT JQUERY, thanks :) EDIT: something like that : click on body except some other tag not working , but without JQuery,

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  • Any merit to a lazy-ish juxt function?

    - by NielsK
    In answering a question about a function that maps over multiple functions with the same arguments (A: juxt), I came up with a function that basically took the same form as juxt, but used map: (defn could-be-lazy-juxt [& funs] (fn [& args] (map #(apply %1 %2) funs (repeat args)))) => ((juxt inc dec str) 1) [2 0 "1"] => ((could-be-lazy-juxt inc dec str) 1) (2 0 "1") => ((juxt * / -) 6 2) [12 3 4] => ((could-be-lazy-juxt * / -) 6 2) (12 3 4) As posted in the original question, I have little clue about the laziness or performance of it, but timing in the REPL does suggest something lazy-ish is going on. => (time (apply (juxt + -) (range 1 100))) "Elapsed time: 0.097198 msecs" [4950 -4948] => (time (apply (could-be-lazy-juxt + -) (range 1 100))) "Elapsed time: 0.074558 msecs" (4950 -4948) => (time (apply (juxt + -) (range 10000000))) "Elapsed time: 1019.317913 msecs" [49999995000000 -49999995000000] => (time (apply (could-be-lazy-juxt + -) (range 10000000))) "Elapsed time: 0.070332 msecs" (49999995000000 -49999995000000) I'm sure this function is not really that quick (the print of the outcome 'feels' about as long in both). Doing a 'take x' on the function only limits the amount of functions evaluated, which probably is limited in it's applicability, and limiting the other parameters by 'take' should be just as lazy in normal juxt. Is this juxt really lazy ? Would a lazy juxt bring anything useful to the table, for instance as a compositing step between other lazy functions ? What are the performance (mem / cpu / object count / compilation) implications ? Is that why the Clojure juxt implementation is done with a reduce and returns a vector ? Edit: Somehow things can always be done simpler in Clojure. (defn could-be-lazy-juxt [& funs] (fn [& args] (map #(apply % args) funs)))

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  • WP7 Button inside ListBox only "clicks" every other press

    - by Zik
    I have a button defined inside of a DataTemplate for my list box. <phone:PhoneApplicationPage.Resources> <DataTemplate x:Key="ListTemplate"> <Grid Margin="12,12,24,12"> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Button Grid.Column="0" Name="EnableDisableButton" Click="EnableDisableButton_Click" BorderBrush="Transparent"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Image Grid.Row="0" Source="\Images\img.dark.png" Width="48" Height="48" Visibility="{StaticResource PhoneDarkThemeVisibility}" /> <Image Grid.Row="0" Source="\Images\img.light.png" Width="48" Height="48" Visibility="{StaticResource PhoneLightThemeVisibility}" /> <Rectangle Grid.Row="1" Width="48" Height="8" Fill="{Binding CurrentColor}" RadiusX="4" RadiusY="4" /> </Grid> </Button> <Grid Grid.Column="1"> <... more stuff here ...> </Grid> </Grid> </DataTemplate> </phone:PhoneApplicationPage.Resources> What I'm seeing is that the first time I press the button, the Click event fires. The second time I press it, it does not fire. Third press, fires. Fourth press, does not fire. Etc. Originally I had it bound to a command but that was behaving the same way. (I put a Debug.WriteLine() in the event handler so I know when it fires.) Any ideas? It's really odd that the click event only fires every other time.

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  • Storing records in a dropdownlist from DB without using LINQ Data source

    - by user1318369
    I have a website for dance academy where Users can register and add/drop dance classes. In the web page to drop a particular dance, for a particular user, the dropdown displays her registered dances. Now I want to delete one of the dances from the list. So i'll remove the row from the table and also from the dropdownlist. The problem is that everytime the item with the lowest ID (index) is getting deleted, no matter which one the user selects. I think I am storing the DataTextField and DataValueField for the dropdown incorrectly. Can someone please help me out? The code is: private void PopulateDanceDropDown() { var registereddanceList = from dd in context.DANCER_AND_DANCE where dd.UserId == dancerId select new { Text = dd.DanceName, Value = dd.DanceId }; dances.DataSource = registereddanceList; dances.DataTextField = "Text"; dances.DataValueField = "Value"; dances.DataBind(); } protected void dropthedance(object o, EventArgs e) { String strDataValueField = dances.SelectedItem.Value; int danceIDFromDropDown = Convert.ToInt32(strDataValueField); var dancer_dance = from dd in context.DANCER_AND_DANCE where dd.DanceId == danceIDFromDropDown select dd; foreach (var dndd in dancer_dance) { context.DANCER_AND_DANCE.DeleteOnSubmit(dndd); } try { context.SubmitChanges(); } catch (Exception ex) { Console.WriteLine(ex); } PopulateDanceDropDown(); }

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  • Ruby execute code in class getting inherited to

    - by AdamB
    I'm trying to be able to have a global exception capture where I can add extra information when an error happens. I have two classes, "crawler" and "amazon". What I want to do is be able to call "crawl", execute a function in amazon, and use the exception handling in the crawl function. Here are the two classes I have: require 'mechanize' class Crawler Mechanize.html_parser = Nokogiri::HTML def initialize @agent = Mechanize.new end def crawl puts "crawling" begin #execute code in Amazon class here? rescue Exception => e puts "Exception: #{e.message}" puts "On url: #{@current_url}" puts e.backtrace end end def get(url) @current_url = url @agent.get(url) end end class Amazon < Crawler #some code with errors def stuff page = get("http://www.amazon.com") puts page.parser.xpath("//asldkfjasdlkj").first['href'] end end a = Amazon.new a.crawl Is there a way I can call "stuff" inside of "crawl" so I can use that exception handling over the entire stuff function? Is there a better way to accomplish this?

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  • Passing values between pages in JavaScript

    - by buni
    using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Configuration; using System.Text; using System.Web.Services; using System.IO; namespace T_Smade { public partial class ConferenceManagement : System.Web.UI.Page { volatile int i = 0; protected void Page_Load(object sender, EventArgs e) { GetSessionList(); } public void GetSessionList() { string secondResult = ""; string userName = ""; try { if (HttpContext.Current.User.Identity.IsAuthenticated) { userName = HttpContext.Current.User.Identity.Name; } SqlConnection thisConnection = new SqlConnection(@"data Source=ZOLA-PC;AttachDbFilename=D:\2\5.Devp\my DB\ASPNETDB.MDF;Integrated Security=True"); thisConnection.Open(); SqlCommand secondCommand = thisConnection.CreateCommand(); secondCommand.CommandText = "SELECT myApp_Session.session_id FROM myApp_Session, myApp_Role_in_Session where myApp_Role_in_Session.user_name='" + userName + "' and myApp_Role_in_Session.session_id=myApp_Session.session_id"; SqlDataReader secondReader = secondCommand.ExecuteReader(); while (secondReader.Read()) { secondResult = secondResult + secondReader["session_id"].ToString() + ";"; } secondReader.Close(); SqlCommand thisCommand = thisConnection.CreateCommand(); thisCommand.CommandText = "SELECT * FROM myApp_Session;"; SqlDataReader thisReader = thisCommand.ExecuteReader(); while (thisReader.Read()) { test.Controls.Add(GetLabel(thisReader["session_id"].ToString(), thisReader["session_name"].ToString())); string[] compare = secondResult.Split(';'); foreach (string word in compare) { if (word == thisReader["session_id"].ToString()) { test.Controls.Add(GetButton(thisReader["session_name"].ToString(), "Join Session")); } } } thisReader.Close(); thisConnection.Close(); } catch (SqlException ex) { } } private Button GetButton(string id, string name) { Button b = new Button(); b.Text = name; b.ID = "Button_" + id + i; b.Command += new CommandEventHandler(Button_Click); b.CommandArgument = id; i++; return b; } private Label GetLabel(string id, string name) { Label tb = new Label(); tb.Text = name; tb.ID = id; return tb; } protected void Button_Click(object sender, CommandEventArgs e) { Response.Redirect("EnterSession.aspx?session=" + e.CommandArgument.ToString()); } } I have this code when a user clicks a button www.mypage/EnterSession.aspx?session=session_name in the EnterSession.aspx i have used the code below to track the current URL _gaq.push(['pageTrackerTime._trackEvent', 'Category', 'Action', document.location.href, roundleaveSiteEnd]); Now I would also like to track in the Action parameter the session_name from the previous page.see the code below from the previous page test.Controls.Add(GetButton(thisReader["session_name"].ToString(), "Join Session")); Some idea how to do it? Thanx

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  • How to find largest common sub-tree in the given two binary search trees?

    - by Bhushan
    Two BSTs (Binary Search Trees) are given. How to find largest common sub-tree in the given two binary trees? EDIT 1: Here is what I have thought: Let, r1 = current node of 1st tree r2 = current node of 2nd tree There are some of the cases I think we need to consider: Case 1 : r1.data < r2.data 2 subproblems to solve: first, check r1 and r2.left second, check r1.right and r2 Case 2 : r1.data > r2.data 2 subproblems to solve: - first, check r1.left and r2 - second, check r1 and r2.right Case 3 : r1.data == r2.data Again, 2 cases to consider here: (a) current node is part of largest common BST compute common subtree size rooted at r1 and r2 (b)current node is NOT part of largest common BST 2 subproblems to solve: first, solve r1.left and r2.left second, solve r1.right and r2.right I can think of the cases we need to check, but I am not able to code it, as of now. And it is NOT a homework problem. Does it look like?

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  • Bash script to insert code from one file at a specific location in another file?

    - by Kurtosis
    I have a fileA with a snippet of code, and I need a script to insert that snippet into fileB on the line after a specific pattern. I'm trying to make the accepted answer in this thread work, but it's not, and is not giving an error so not sure why not: sed -e '/pattern/r text2insert' filewithpattern Any suggestions? pattern (insert snippet on line after): def boot { also tried escaped pattern but no luck: def\ boot\ { def\ boot\ \{ fileA snippet: LiftRules.htmlProperties.default.set((r: Req) => new Html5Properties(r.userAgent)) fileB (Boot.scala): package bootstrap.liftweb import net.liftweb._ import util._ import Helpers._ import common._ import http._ import sitemap._ import Loc._ /** * A class that's instantiated early and run. It allows the application * to modify lift's environment */ class Boot { def boot { // where to search snippet LiftRules.addToPackages("code") // Build SiteMap val entries = List( Menu.i("Home") / "index", // the simple way to declare a menu // more complex because this menu allows anything in the // /static path to be visible Menu(Loc("Static", Link(List("static"), true, "/static/index"), "Static Content"))) // set the sitemap. Note if you don't want access control for // each page, just comment this line out. LiftRules.setSiteMap(SiteMap(entries:_*)) // Use jQuery 1.4 LiftRules.jsArtifacts = net.liftweb.http.js.jquery.JQuery14Artifacts //Show the spinny image when an Ajax call starts LiftRules.ajaxStart = Full(() => LiftRules.jsArtifacts.show("ajax-loader").cmd) // Make the spinny image go away when it ends LiftRules.ajaxEnd = Full(() => LiftRules.jsArtifacts.hide("ajax-loader").cmd) // Force the request to be UTF-8 LiftRules.early.append(_.setCharacterEncoding("UTF-8")) } }

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  • Remove hash (#) from url in Ajax navigation without refresh

    - by Email
    I have an ajax navigation similar like here. now if a menu is clicked window.location.hash is added like this #about i want to REmove the hash (#) so that people can easily copy and share the link naturally. How this can be done in april 2012 without a pagerefresh crossbrowserwise (IE7+,FF,Opera,Safari) ? For inspiration: Here is actually someone already doing this, click on "portfolio" or "features" and watch the url in your browser. thanks for tips

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  • Getting Started with Kinect for Windows.

    - by Vishal
    Hello folks,      Recently I got involved in a project for building a demo application for one of our customers with Kinect for Windows. Yes, something similar what Tom Cruise did in the movie Minority Report. Waving arms, moving stuff around, swipes, speech recognition, manipulating computer screens without even touching it. Pretty cool!!! The idea in the movie showed us how technology would be after 50 years from that day.   Minority Report Movie clip.           Well, that 50 years of time frame got squeezed and recently on Feb 1st 2012, Microsoft released the official Kinect for Windows SDK. That’s just 10 years from the movie release. Although, the product is in it early stages but with developer creativity and continuously improving hardware, those features shown in the movie are not very far away from becoming a reality. Soon after releasing the SDK, Microsoft again announced in March the release of its new Kinect for Windows SDK version 1.5 which is coming out in sometime May. More history about Kinect. Anyways, so for a newbie with Kinect, where would you start. Here is what I would suggest you can do. Watch the Kinect for Windows Quick start Series by Den Fernandez. Download the Kinect for Windows SDK and start playing around with the demos in it. It also comes with some basic Kinect documentation. Coding4Fun Kinect Projects | Lot many more videos and open sources projects information. Kinect for Windows Session at Techdays NL demo by Jesus Rodriguez. Book: Beginning Kinect Programming with the Microsoft Kinect SDK.  | I did go through few of the chapters in this book and based on that, it does talk deeply about core Kinect concepts but in very easy to understand way. I would definitely suggest this book for any Kinect developers. I liked the way it explained the Gestures recognition in Chapter 6. Buy your Kinect device from either Amazon or NewEgg. You will get it cheaper then buying it from Microsoft Store. Personally, I love Newegg.com as I never had any order related or shipping issues with them. I always hate developing UI application but well, you would need to get your hands dirty with WPF too in order to work with Kinect. So get started with WPF concepts too. I will keep adding stuff to the list once I come across them but so far the above list would definitely get you started building your first Kinect apps. Till then Happy Kinecting…!!!!! Thanks, Vishal Mody

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  • April 2012 Patch Tuesday

    - by TATWORTH
    Next Tuesday, Microsoft will issue a number of critical patches. I urge you to apply the patches to your desktop PCs A.S.A.P. , then deploy to your test servers, test, get signoff and deploy to production.More information can be obtained at:http://www.computerworld.com/s/article/9225883/Microsoft_slates_critical_Windows_Office_IE_patches_next_week_including_head_scratcher_?taxonomyId=17http://technet.microsoft.com/en-us/security/bulletin/ms12-aprhttp://www.scmagazine.com/microsoft-to-sew-up-11-security-vulnerabilities-next-week/article/235396/http://www.zdnet.com/blog/security/microsoft-readies-patch-for-gaping-ie-browser-security-holes/11366

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  • Serving a video and audio upload and streaming intense site

    - by Pollux Khafra
    I'm about to launch a new site that allows user to both upload/stream audio and video and I don't know anything about the server side of things. My original plan was to just use a dedicated server through Hostgator but from what I'm reading, Cloud hosting or Load balanced clustered is the best way to go for what Im trying to do. All the articles seem to have an agenda to sell you on an affiliate web host so how do I really need to do this?

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  • Shares not working on boot need to reinstall "File and Printer Sharing for Microsoft Networks" on server every morning to fix

    - by Neaox
    I had a problem a few days ago see question here: Can no longer access computer or network shares to my server from any other computers on the network The fix that I found does in fact work however when I boot my PC in the morning the shares are no longer working, to fix this I need to remote desktop into the server and re-install "File and Printer Sharing for Microsoft Networks" on the main adaptor. Doing this makes the shares work again, however it is anoying to have to do this each and every morning. On top of this my offline files are no longer available offline: I store my user profile on the server and had them selected to be "Always Available" however since this has happened they are no longer available offline and the option to make them available offline from the context menu is no longer available. Another problem, and I don't know if this is the cause or just a tell of a deeper issue but this server runs hyper-v, since these problems I can no longer remote desktop into the hyper-v client. Thanks for any help anyone can give.

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