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  • Types issue in F#

    - by Andry
    Hello! In my ongoing adventure deep diving into f# I am understanding a lot of this powerful language but there are things that I still do not understand so clearly. One of the most important issues I need to master is types. Well the book I am reading is very straight forward and introduces entities and main functionalities with a direct approach. The first thing I could get start with is types. It introduces the main types as list, option, tuples, and so on... It is clearly underlined that all these types are IMMUTABLE for many reasons regarding functional programming and data consistance in functional programing. Well, no problems until now... But now I am getting started with Concrete Types... Well... I have problems in managing with types like list, option, tuples, types created through new operator and concrete types created using type keyword (for abbreviations, concrete types...). So my question is: how can I efficently catalogue/distinguish all types of data in f#???? I can create a perfect separation among types in C#, VB.NET... FOr example in VB.NET there are value and reference types while in C# there are only references and also int, double are treated as objects (they are objects while in VB.NET a value type is not a object and there is a split in types for this reason). Well in F# I cannot create such differences among types in the language. Can you help me? I hope I was clear.

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  • MATLAB Easter Egg Spy vs Spy

    - by Aqui1aZ3r0
    I heard that MATLAB 2009b or earlier had a fun function. When you typed spy in the console, you would get something like this: http://t2.gstatic.com/images?q=tbn:ANd9GcSHAgKz-y1HyPHcfKvBpYmZ02PWpe3ONMDat8psEr89K0VsP_ft However, now you have an image like this:http://undocumentedmatlab.com/images/spy2.png I'd like it if I could get the code of the original spy vs spy image FYI, there's a code, but has certain errors in it: c = [';@3EA4:aei7]ced.CFHE;4\T*Y,dL0,HOQQMJLJE9PX[[Q.ZF.\JTCA1dd' '-IorRPNMPIE-Y\R8[I8]SUDW2e+' '=4BGC;7imiag2IFOQLID8''XI.]K0"PD@l32UZhP//P988_WC,U+Z^Y\<2' '&lt;82BF>?8jnjbhLJGPRMJE9/YJ/L1#QMC$;;V[iv09QE99,XD.YB,[_]=3a' '9;CG?@9kokc2MKHQSOKF:0ZL0aM2$RNG%AAW\jw9E.FEE-_G8aG.d]_W5+' '?:CDH@A:lpld3NLIRTPLG=1[M1bN3%SOH4BBX]kx:J9LLL8H9bJ/+d_dX6,' '@;DEIAB;mqmePOMJSUQMJ2\N2cO4&TPP@HCY^lyDKEMMN9+I@+S8,+deY7^' '8@EFJBC<4rnfQPNPTVRNKB3]O3dP5''UQQCIDZ_mzEPFNNOE,RA,T9/,++\8_' '9A2G3CD=544gRQPQUWUOLE4^P4"Q6(VRRIJE[n{KQKOOPK-SE.W:F/,,]Z+' ':BDH4DE>655hSRQRVXVPMF5_Q5#R>)eSSJKF\ao0L.L-WUL.VF8XCH001_[,' ';3EI<eo ?766iTSRSWYWQNG6$R6''S?*fTTlLQ]bp1M/P.XVP8[H9]DIDA=]' '?4D3=FP@877jUTSTXZXROK7%S7(TF+gUUmMR^cq:N9Q8YZQ9_IcIJEBd_^' '@5E@GQA98b3VUTUY*YSPL8&T)UI,hVhnNS_dr;PE.9Z[RCaR?+JTFC?e+' '79FA?HRB:9c4WVUVZ+ZWQM=,WG*VJ-"gi4OTes-XH+bK.#hj@PUvftDRMEF,]UH,UB.TYVWX,e\' '9;ECAKTY< ;eWYXWX\:)YSOE.YI,cL/$ikCqV1guE/PFL-^XI-YG/WZWXY1+]' ':AFDBLUZ=jgY[ZYZ-<7[XQG0[K.eN1&"$K2u:iyO9.PN9-_K8aJ9_]]82[' '?CEFDNW\?khZ[Z[==8\YRH1\M/!O2''#%m31Bw0PE/QXE8+R9bS;da^]93\' '@2FGEOX]ali[][9(ZSL2]N0"P3($&n;2Cx1QN9--L9,SA+T< +d_:4,' 'A3GHFPY^bmj\^]\]??:)[TM3^O1%Q4)%''oA:D0:0OE.8ME-TE,XB,+da;5[' '643IGQZ_cnk]_^]^@@;5\UN4_P2&R6*&(3B;E1<1PN99NL8WF.^C/,a+bY6,' '7:F3HR[dol^_^AA<6]VO5Q3''S>+'');CBF:=:QOEEOO9_G8aH6/d,cZ[Y' '8;G4IS\aep4_a-BD=7''XP6aR4(T?,(5@DCHCC;RPFLPPDH9bJ70+0d\\Z' '9BH>JT^bf45ba.CE@8(YQ7#S5)UD-)?AEDIDDD/QKMVQJ+S?cSDF,1e]a,' ':C3?K4_cg5[acbaADFA92ZR8$T6*VE.*@JFEJEEE0.NNWTK,U@+TEG0?+_bX' ';2D@L9dh6\bdcbBEGD:3[S=)U7+cK/+CKGFLIKI9/OWZUL-VA,WIHB@,`cY']; i = double(c(:)-32); j = cumsum(diff([0; i])< =0) + 1; S = sparse(i,j,1)'; spy(S)

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  • Using MinHash to find similiarities between 2 images

    - by Sung Meister
    I am using MinHash algorithm to find similar images between images. I have run across this post, How can I recognize slightly modified images? which pointed me to MinHash algorithm. Being a bit mathematically challenged, I was using a C# implementation from this blog post, Set Similarity and Min Hash. But while trying to use the implementation, I have run into 2 problems. What value should I set universe value to? When passing image byte array to HashSet, it only contains distinct byte values; thus comparing values from 1 ~ 256. What is this universe in MinHash? And what can I do to improve the C# MinHash implementation? Since HashSet<byte> contains values upto 256, similarity value always come out to 1. Here is the source that uses the C# MinHash implementation from Set Similarity and Min Hash: class Program { static void Main(string[] args) { var imageSet1 = GetImageByte(@".\Images\01.JPG"); var imageSet2 = GetImageByte(@".\Images\02.TIF"); //var app = new MinHash(256); var app = new MinHash(Math.Min(imageSet1.Count, imageSet2.Count)); double imageSimilarity = app.Similarity(imageSet1, imageSet2); Console.WriteLine("similarity = {0}", imageSimilarity); } private static HashSet<byte> GetImageByte(string imagePath) { using (var fs = new FileStream(imagePath, FileMode.Open, FileAccess.Read)) using (var br = new BinaryReader(fs)) { //List<int> bytes = br.ReadBytes((int)fs.Length).Cast<int>().ToList(); var bytes = new List<byte>(br.ReadBytes((int) fs.Length).ToArray()); return new HashSet<byte>(bytes); } } }

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  • ISP Config 3 - squirrel login error & how to add an smtp server for sending mails

    - by A Prasetyo
    Hi, Case #1: I have ISPConfig3 running, sending email through telnet server.mydomain.com 25 are possible. Receiving email also possible. BUT!! problem occurs when I try to login to squirrel... I've been awaken for 2 days now and still couldn't figured out why logging in into squirrel always having an error: ERROR: Connection dropped by IMAP server. here is the /var/log/mail.log: Jun 3 00:23:27 server-01 imapd: Connection, ip=[::ffff:127.0.0.1] Jun 3 00:23:27 server-01 imapd: chdir /var/vmail/mydomain.com/info: Permission denied Jun 3 00:23:27 server-01 imapd: [email protected]: Permission denied I did chmod 777 & still doesn't work, only another message appeared Jun 3 00:24:28 server-01 imapd: Connection, ip=[::ffff:127.0.0.1] Jun 3 00:24:28 server-01 imapd: [email protected]: Account's mailbox directory is not owned by the correct uid or gid Try to do telnet to IMAP port telnet mydomain.com 143 Trying 63.105.102.48... Connected to mydomain.com. Escape character is '^]'. OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2008 Double Precision, Inc. See COPYING for distribution information. login [email protected] mypassword login NO Error in IMAP command received by server. and give no result... -_- I checked mysql.sock, I checked username and password in mysql db, everything is correct.. anyone can help? PLEASE?! Case #2: Does anyone know how to set or to view SMTP settings in ISPConfig 3? thank you..

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  • How can I run a BitchX when I don't have ssh or shell access?

    - by Christopher
    I just installed an IRC bot, B****X (Don't ask, I don't know - the real name is not censored). I did all of the configuration and chmod'ed the pl files to 755, but running it won't work. My host does not allow SSH/Shell (which is how the documentation says to runs he script), but just going to the URL usually works because of this. However, I get a 500 (Internal Server Error) error. I have logged errors: Possible unintended interpolation of @moz in string at ./bitch.conf line 78 (#1) (W ambiguous) You said something like `@foo' in a double-quoted string but there was no array @foo in scope at the time. If you wanted a literal @foo, then write it as \@foo; otherwise find out what happened to the array you apparently lost track of. [Fri Mar 19 16:31:43 2010] bitch.pl: Possible unintended interpolation of @moz in string at ./bitch.conf line 78. Uncaught exception from user code: [Fri Mar 19 16:31:46 2010] bitch.pl: [[31mFAILED[0m] (connect error: Connection refused) at /usr/local/lib/perl5/5.8.8/CGI/Carp.pm line 354 CGI::Carp::realdie('[Fri Mar 19 16:31:46 2010] bitch.pl: [\x{1b}[31mFAILED\x{1b}[0m] (conne...') called at /usr/local/lib/perl5/5.8.8/CGI/Carp.pm line 446 CGI::Carp::die('[\x{1b}[31mFAILED\x{1b}[0m] (connect error: Connection refused)\x{a}') called at bitch.pl line 555 Thanks in advance

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  • Linux RFID reader HID Device not matching driver

    - by blietaer
    Hello, I got a RFID reader (GigaTek PCR330A-00) that is meant to be recognized under linux/windows as a (Human Interface Device) keyboard/USB. I hate to say this but it is working as a charm under Win7 but not "really" under Linux. Under Debian-like distros (x/k/Ubuntu, Debian,..), or Gentoo, or... I just can't have the device working at all: the device scan well (it has its USB 5V, so it is happy/beeping/blinking) something happened in the dmesg, but no immediate screen display of the RFID Tag code as expected (and seen under win7) Support is claiming it is ok under RHEL or SLED "enterprises" distros... and I must admit I saw it working under a RHEL4... I tried stealing the driver but did not succeed having my reader working... My question is thus double: 1./ How can I hack the kernel to add support to my device (simply register PID/VID?) ? 2./ What is different at all in a "enterprise" proprietary distro? how can I re-use it? Thank you for any hint/help. Cheers,

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  • Silverlight - How do I make each item in a list box be the same height?

    - by NotDan
    How can I make a silverlight listbox have all items be the same size and have them take up 100% of the listbox height. I.e. 1 item would be the height of the listbox, 2 items would each be 50% of the height of the list box, etc... Edit - Here is the code public class UniformPanel : Panel { protected override Size MeasureOverride(Size availableSize) { Size panelDesiredSize = new Size(); for (int i = 0; i < Children.Count; i++) { UIElement child = Children[i]; child.Measure(availableSize); var childDesiredSize = child.DesiredSize; panelDesiredSize.Height += childDesiredSize.Height; if (panelDesiredSize.Width < childDesiredSize.Width) { panelDesiredSize.Width = childDesiredSize.Width; } } return panelDesiredSize; } protected override Size ArrangeOverride(Size finalSize) { double height = finalSize.Height/Children.Count; for (int i = 0; i < Children.Count; i++) { UIElement child = Children[i]; Size size = new Size(finalSize.Width, height); child.Arrange(new Rect(new Point(0, i * height), size)); } return finalSize; // Returns the final Arranged size } }

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  • Qt - no such signal error

    - by bullettime
    I'm trying to trigger a signal when a double click happens in one of the draggable widgets on the fridge magnets example. Here's the changes I made to the example source: DragLabel: class DragLabel : public QLabel { public: DragLabel(const QString &text, QWidget *parent); QString labelText() const; public slots: void testSlot(){qDebug()<<"testSlot";} //<-- implemented this slot protected: void mouseDoubleClickEvent(QMouseEvent *ev){emit testSignal();} //<-- overriden this method private: QString m_labelText; signals: void testSignal(); //<-- added this signal }; The only thing I changed in the implementation file is adding connect(this,SIGNAL(testSignal()),this,SLOT(testSlot())); to DragLabel's constructor. Trying to compile the project resulted in 'undefined reference to `DragLabel::testSignal()' and 'collect2: ld returned 1 exit status' errors. When I comment out the call to the signal, it compiles and runs, but gives off 'Object::connect: No such signal QLabel::testSignal() in draglabel.cpp' warning in the application output. Apparently testSignal() isn't being recognized as a signal. What am I missing?

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  • Hi, How can I convert a dynamic web page to pdf?

    - by Jemma Diampuan
    I have a dynamic webpage that I created using html and php... I already have sample codes that can convert a static web page to pdf... But my problem is my web page is dynamic... So is there a way to convert my page to pdf? If yes, please provide some easy to understand codes... thank... Anyway, here is my code: //session variable $userID = 1; $receipt = &new Receipt(); $receipt->queryReceiptInfo($userID); $receiptID = $receipt->getReceiptID(); $receiptIssueDate = $receipt->getReceiptIssueDate(); $customer = $receipt->getCustomer(); $salesID = $receipt->getSalesID(); $salesDetail = &new SalesDetail($salesID); $salesDetails = $salesDetail->viewSalesDetail(); //session variable $businessID = 1; $business = &new Business('', $businessID); $business->queryBusinessName(); $businessName = $business->getBusinessName(); $rows = sizeof($salesDetails); $columns = sizeof($salesDetails[0]); ? Receipt No. Date Issued Business Customer Item Quantity Sub-Total "; for($j = 0; $j ".$salesDetails[$i][$j].""; } $totalPrice += (double)$salesDetails[$i][2]; echo ""; } ? Total Price

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  • How to avoid loading a LINQ to SQL object twice when editting it on a website.

    - by emzero
    Hi guys I know you are all tired of this Linq-to-Sql questions, but I'm barely starting to use it (never used an ORM before) and I've already find some "ugly" things. I'm pretty used to ASP.NET Webforms old school developing, but I want to leave that behind and learn the new stuff (I've just started to read a ASP.NET MVC book and a .NET 3.5/4.0 one). So here's is one thing I didn't like and I couldn't find a good alternative to it. In most examples of editing a LINQ object I've seen the object is loaded (hitting the db) at first to fill the current values on the form page. Then, the user modify some fields and when the "Save" button is clicked, the object is loaded for second time and then updated. Here's a simplified example of ScottGu NerdDinner site. // // GET: /Dinners/Edit/5 [Authorize] public ActionResult Edit(int id) { Dinner dinner = dinnerRepository.GetDinner(id); return View(new DinnerFormViewModel(dinner)); } // // POST: /Dinners/Edit/5 [AcceptVerbs(HttpVerbs.Post), Authorize] public ActionResult Edit(int id, FormCollection collection) { Dinner dinner = dinnerRepository.GetDinner(id); UpdateModel(dinner); dinnerRepository.Save(); return RedirectToAction("Details", new { id=dinner.DinnerID }); } As you can see the dinner object is loaded two times for every modification. Unless I'm missing something about LINQ to SQL caching the last queried objects or something like that I don't like getting it twice when it should be retrieved only one time, modified and then comitted back to the database. So again, am I really missing something? Or is it really hitting the database twice (in the example above it won't harm, but there could be cases that getting an object or set of objects could be heavy stuff). If so, what alternative do you think is the best to avoid double-loading the object? Thank you so much, Greetings!

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  • C#: No value given for one or more required parameter with FormView

    - by Vinzcent
    Hey, I am using a FormView and when I want to update something I have edited, I always get this error: No value given for one or more required parameters. I use a SQLDataSource in combination with a FormView This is the code of my SQLDataSource <asp:SqlDataSource ID="sqldsLokaalPrinters" runat="server" ConnectionString="<%$ ConnectionStrings:connRand2 %>" DeleteCommand="DELETE FROM [tblComputers] WHERE (([tblArtveldenr] = ?) OR ([tblArtveldenr] IS NULL AND ? IS NULL))" InsertCommand="INSERT INTO [tblComputers] ([tblArtveldenr], [tblNaam], [tblCLokaal_id], [tblPositie], [tblSerienr], [tblTCPIP], [tblFabrikant], [tblModel], [tblProcessor], [tblSnelheid], [tblKleur], [tblGeheugen], [tblHarddisk], [tblZip], [tblCD], [tblDVD], [tblNetwerk], [tblFirewire], [tblAanschafdatum], [tblCLeverabcierNr], [tblScherm], [tblLaptop]) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)" ProviderName="<%$ ConnectionStrings:connRand2.ProviderName %>" SelectCommand="SELECT * FROM [tblComputers] WHERE ([tblCLokaal_id] = ?)" UpdateCommand="UPDATE [tblComputers] SET [tblNaam] = ?, [tblCLokaal_id] = ?, [tblPositie] = ?, [tblSerienr] = ?, [tblTCPIP] = ?, [tblFabrikant] = ?, [tblModel] = ?, [tblProcessor] = ?, [tblSnelheid] = ?, [tblKleur] = ?, [tblGeheugen] = ?, [tblHarddisk] = ?, [tblZip] = ?, [tblCD] = ?, [tblDVD] = ?, [tblNetwerk] = ?, [tblFirewire] = ?, [tblAanschafdatum] = ?, [tblCLeverabcierNr] = ?, [tblScherm] = ?, [tblLaptop] = ? WHERE (([tblArtveldenr] = ?) OR ([tblArtveldenr] IS NULL AND ? IS NULL))"> <SelectParameters> <asp:SessionParameter Name="tblCLokaal_id" SessionField="lokaalID" Type="Int16" /> </SelectParameters> <DeleteParameters> <asp:Parameter Name="tblArtveldenr" Type="String" /> </DeleteParameters> <UpdateParameters> <asp:Parameter Name="tblNaam" Type="String" /> <asp:Parameter Name="tblCLokaal_id" Type="Int16" /> <asp:Parameter Name="tblPositie" Type="Int32" /> <asp:Parameter Name="tblSerienr" Type="String" /> <asp:Parameter Name="tblTCPIP" Type="String" /> <asp:Parameter Name="tblFabrikant" Type="String" /> <asp:Parameter Name="tblModel" Type="String" /> <asp:Parameter Name="tblProcessor" Type="String" /> <asp:Parameter Name="tblSnelheid" Type="Int32" /> <asp:Parameter Name="tblKleur" Type="String" /> <asp:Parameter Name="tblGeheugen" Type="Int32" /> <asp:Parameter Name="tblHarddisk" Type="Double" /> <asp:Parameter Name="tblZip" Type="String" /> <asp:Parameter Name="tblCD" Type="String" /> <asp:Parameter Name="tblDVD" Type="String" /> <asp:Parameter Name="tblNetwerk" Type="String" /> <asp:Parameter Name="tblFirewire" Type="Int32" /> <asp:Parameter Name="tblAanschafdatum" Type="DateTime" /> <asp:Parameter Name="tblCLeverabcierNr" Type="Int32" /> <asp:Parameter Name="tblScherm" Type="String" /> <asp:Parameter Name="tblLaptop" Type="Boolean" /> <asp:Parameter Name="tblArtveldenr" Type="String" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="tblArtveldenr" Type="String" /> <asp:Parameter Name="tblNaam" Type="String" /> <asp:Parameter Name="tblCLokaal_id" Type="Int16" /> <asp:Parameter Name="tblPositie" Type="Int32" /> <asp:Parameter Name="tblSerienr" Type="String" /> <asp:Parameter Name="tblTCPIP" Type="String" /> <asp:Parameter Name="tblFabrikant" Type="String" /> <asp:Parameter Name="tblModel" Type="String" /> <asp:Parameter Name="tblProcessor" Type="String" /> <asp:Parameter Name="tblSnelheid" Type="Int32" /> <asp:Parameter Name="tblKleur" Type="String" /> <asp:Parameter Name="tblGeheugen" Type="Int32" /> <asp:Parameter Name="tblHarddisk" Type="Double" /> <asp:Parameter Name="tblZip" Type="String" /> <asp:Parameter Name="tblCD" Type="String" /> <asp:Parameter Name="tblDVD" Type="String" /> <asp:Parameter Name="tblNetwerk" Type="String" /> <asp:Parameter Name="tblFirewire" Type="Int32" /> <asp:Parameter Name="tblAanschafdatum" Type="DateTime" /> <asp:Parameter Name="tblCLeverabcierNr" Type="Int32" /> <asp:Parameter Name="tblScherm" Type="String" /> <asp:Parameter Name="tblLaptop" Type="Boolean" /> </InsertParameters> </asp:SqlDataSource> This is the code of my FormView <asp:FormView ID="FormView1" runat="server" AllowPaging="True" DataKeyNames="tblArtveldenr" DataSourceID="sqldsLokaalPrinters"> <EditItemTemplate> tblPositie: <asp:TextBox ID="tblPositieTextBox" runat="server" Text='<%# Bind("tblPositie") %>' /> <br /> tblSerienr: <asp:TextBox ID="tblSerienrTextBox" runat="server" Text='<%# Bind("tblSerienr") %>' /> <br /> tblFabrikant: <asp:TextBox ID="tblFabrikantTextBox" runat="server" Text='<%# Bind("tblFabrikant") %>' /> <br /> tblModel: <asp:TextBox ID="tblModelTextBox" runat="server" Text='<%# Bind("tblModel") %>' /> <br /> tblSnelheid: <asp:TextBox ID="tblSnelheidTextBox" runat="server" Text='<%# Bind("tblSnelheid") %>' /> <br /> tblHarddisk: <asp:TextBox ID="tblHarddiskTextBox" runat="server" Text='<%# Bind("tblHarddisk") %>' /> <br /> tblCD: <asp:TextBox ID="tblCDTextBox" runat="server" Text='<%# Bind("tblCD") %>' /> <br /> tblDVD: <asp:TextBox ID="tblDVDTextBox" runat="server" Text='<%# Bind("tblDVD") %>' /> <br /> tblAanschafdatum: <asp:TextBox ID="tblAanschafdatumTextBox" runat="server" Text='<%# Bind("tblAanschafdatum") %>' /> <br /> <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update" Text="Update" /> &nbsp;<asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> </EditItemTemplate> <InsertItemTemplate> tblPositie: <asp:TextBox ID="tblPositieTextBox" runat="server" Text='<%# Bind("tblPositie") %>' /> <br /> tblSerienr: <asp:TextBox ID="tblSerienrTextBox" runat="server" Text='<%# Bind("tblSerienr") %>' /> <br /> tblFabrikant: <asp:TextBox ID="tblFabrikantTextBox" runat="server" Text='<%# Bind("tblFabrikant") %>' /> <br /> tblModel: <asp:TextBox ID="tblModelTextBox" runat="server" Text='<%# Bind("tblModel") %>' /> <br /> tblSnelheid: <asp:TextBox ID="tblSnelheidTextBox" runat="server" Text='<%# Bind("tblSnelheid") %>' /> <br /> tblHarddisk: <asp:TextBox ID="tblHarddiskTextBox" runat="server" Text='<%# Bind("tblHarddisk") %>' /> <br /> tblCD: <asp:TextBox ID="tblCDTextBox" runat="server" Text='<%# Bind("tblCD") %>' /> <br /> tblDVD: <asp:TextBox ID="tblDVDTextBox" runat="server" Text='<%# Bind("tblDVD") %>' /> <br /> tblAanschafdatum: <asp:TextBox ID="tblAanschafdatumTextBox" runat="server" Text='<%# Bind("tblAanschafdatum") %>' /> <br /> <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert" /> &nbsp;<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> </InsertItemTemplate> <ItemTemplate> tblPositie: <asp:Label ID="tblPositieLabel" runat="server" Text='<%# Bind("tblPositie") %>' /> <br /> tblSerienr: <asp:Label ID="tblSerienrLabel" runat="server" Text='<%# Bind("tblSerienr") %>' /> <br /> tblFabrikant: <asp:Label ID="tblFabrikantLabel" runat="server" Text='<%# Bind("tblFabrikant") %>' /> <br /> tblModel: <asp:Label ID="tblModelLabel" runat="server" Text='<%# Bind("tblModel") %>' /> <br /> tblSnelheid: <asp:Label ID="tblSnelheidLabel" runat="server" Text='<%# Bind("tblSnelheid") %>' /> <br /> tblHarddisk: <asp:Label ID="tblHarddiskLabel" runat="server" Text='<%# Bind("tblHarddisk") %>' /> <br /> tblCD: <asp:Label ID="tblCDLabel" runat="server" Text='<%# Bind("tblCD") %>' /> <br /> tblDVD: <asp:Label ID="tblDVDLabel" runat="server" Text='<%# Bind("tblDVD") %>' /> <br /> tblAanschafdatum: <asp:Label ID="tblAanschafdatumLabel" runat="server" Text='<%# Bind("tblAanschafdatum") %>' /> <br /> <br /> <asp:LinkButton ID="EditButton" runat="server" CausesValidation="False" CommandName="Edit" Text="Edit" /> &nbsp;<asp:LinkButton ID="DeleteButton" runat="server" CausesValidation="False" CommandName="Delete" Text="Delete" /> &nbsp;<asp:LinkButton ID="NewButton" runat="server" CausesValidation="False" CommandName="New" Text="New" /> </ItemTemplate> </asp:FormView> I have no idea how to solve this error Thanks a lot Vincent

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  • How do I escape ampersands in batch files?

    - by Peter Mortensen
    How do I escape ampersands in a batch file (or from the Windows command line) in order to use the start command to open web pages with ampersands in the URL? Double quotes will not work with start; this starts a new command line window instead. Update 1: Wael Dalloul's solution works. In addition, if there are URL encoded characters (e.g. space is encoded as %20) in the URL and it is in a batch file then '%' must be encoded as '%%'. This is not the case in the example. Example, from the command line (CMD.EXE): start http://www.google.com/search?client=opera&rls=en&q=escape+ampersand&sourceid=opera&ie=utf-8&oe=utf-8 will result in http://www.google.com/search?client=opera being opened in the default browser and these errors in the command line window: 'rls' is not recognized as an internal or external command, operable program or batch file. 'q' is not recognized as an internal or external command, operable program or batch file. 'sourceid' is not recognized as an internal or external command, operable program or batch file. 'ie' is not recognized as an internal or external command, operable program or batch file. 'oe' is not recognized as an internal or external command, operable program or batch file. Platform: Windows XP 64 bit SP2.

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  • Iterator performance contract (and use on non-collections)

    - by polygenelubricants
    If all that you're doing is a simple one-pass iteration (i.e. only hasNext() and next(), no remove()), are you guaranteed linear time performance and/or amortized constant cost per operation? Is this specified in the Iterator contract anywhere? Are there data structures/Java Collection which cannot be iterated in linear time? java.util.Scanner implements Iterator<String>. A Scanner is hardly a data structure (e.g. remove() makes absolutely no sense). Is this considered a design blunder? Is something like PrimeGenerator implements Iterator<Integer> considered bad design, or is this exactly what Iterator is for? (hasNext() always returns true, next() computes the next number on demand, remove() makes no sense). Similarly, would it have made sense for java.util.Random implements Iterator<Double>? Should a type really implement Iterator if it's effectively only using one-third of its API? (i.e. no remove(), always hasNext())

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  • Binary search in a sorted (memory-mapped ?) file in Java

    - by sds
    I am struggling to port a Perl program to Java, and learning Java as I go. A central component of the original program is a Perl module that does string prefix lookups in a +500 GB sorted text file using binary search (essentially, "seek" to a byte offset in the middle of the file, backtrack to nearest newline, compare line prefix with the search string, "seek" to half/double that byte offset, repeat until found...) I have experimented with several database solutions but found that nothing beats this in sheer lookup speed with data sets of this size. Do you know of any existing Java library that implements such functionality? Failing that, could you point me to some idiomatic example code that does random access reads in text files? Alternatively, I am not familiar with the new (?) Java I/O libraries but would it be an option to memory-map the 500 GB text file (I'm on a 64-bit machine with memory to spare) and do binary search on the memory-mapped byte array? I would be very interested to hear any experiences you have to share about this and similar problems.

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  • Overridden button control escaping content. How to stop it?

    - by RemotecUk
    Hi, I've got an ASP.Net button control that I have overridden to provide different functionality. the code looks as follows.. I'm overriding the Render method to surround the control with an <a>... /// <summary> /// Render Method /// </summary> /// <param name="writer"></param> protected override void Render(HtmlTextWriter writer) { base.CssClass = "euva-button-decorated"; writer.Write("<a class=\"euva-button\">"); base.Render(writer); writer.Write("</a>"); } When I check the generated source on the page, I find that where ASP.Net has injected its click handler it does the following... <a class="euva-button"><input type="submit" name="TestButton" value="Test Button" onclick="clickOnce(this);WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;TestButton&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" id="TestButton" class="euva-button-decorated" /></a> ... it seems to be escaping the output for the double quotes which means that the browser cannot understand the javascript. How do I make the render method not escape the injected ASP.Net client click handler ?? Note I also have my own client click handler which is declared declaratively in the page mark-up.

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  • using a JOIN in an UPDATE in SQL

    - by SDLFunTimes
    Hi, I'm having trouble formulating a legal statement to double the statuses of the suppliers (s) who have shipped (sp) more than 500 units. I've been trying: update s set s.status = s.status * 2 from s join sp on (sp.sno = s.sno) group by sno having sum(qty) > 500; however I'm getting this error from Mysql: ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from s join sp on (sp.sno = s.sno) group by sno having sum(qty) > 500' at line 1 Does anyone have any ideas about what is wrong with this query? Here's my schema: create table s ( sno char(5) not null, sname char(20) not null, status smallint, city char(15), primary key (sno) ); create table p ( pno char(6) not null, pname char(20) not null, color char(6), weight smallint, city char(15), primary key (pno) ); create table sp ( sno char(5) not null, pno char(6) not null, qty integer not null, primary key (sno, pno) );

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  • unable to place breakpoints in eclipse

    - by anjanb
    I am using eclipse europa (3.5) on windows vista home premium 64-bit using JDK 1.6.0_18 (32 BIT). Normally, I am able to put breakpoints just fine; However, for a particular class which is NOT part of the project (this class is inside a .JAR file (.JAR file is part of the project) ), although I have attached a source directory to this .JAR file, I am unable to place a breakpoint in this class. If I double-click on the breakpoint pane(left border), I notice that a class breakpoint is placed. I was wondering if there was NO debug info; However, found that this particular class was compiled using ant/javac task using debug="true" and debuglevel="lines,vars,source". I even ran jad on this class to confirm that it indeed contained the debug info. So, why is eclipse preventing me from placing a breakpoint ? EDIT : Just so everyone understands the context, this is a webapp running under tomcat 6.0. I am remote debugging the application from eclipse after having started tomcat outside. The application is working just fine. I am trying to understand the behavior of the above class which I'm unable to do since eclipse is not letting me set a BP. P.S : I saw a few threads here talking about BPs not being hit but in my case, I am unable to place the BP! P.P.S : I tried JDK 1.6.0_16 before trying out 1.6.0_18. Thanks for any pointers.

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  • SharePoint 2010 / ASP.Net Integration - Looking for advice

    - by jpennal
    I have been Googling a problem that I have with trying to integrate the web application that I am working on with SharePoint 2010. The web application is a wiki style tool that allows users to log in via forms authentication or WIA against Active Directory and create content for themselves and others. What we would like to do is to allow a user have a page with the content they have created in our web application mixed in with content that they have living on the SharePoint server. For example, they may want to see a list of documents that they have on the SharePoint server mixed in with some of their content. To accomplish this, we would like to take the credentials the user has logged into our web application with (for example MYDOMAIN\jsmith) and be able to query SharePoint for the documents of that same user (MYDOMAIN\jsmith) WITHOUT the user being prompted to re-enter their credentials to access the SharePoint server (we are trying to avoid the double-hop problem) We have come up with some options for how we want to do this, but we are unsure of what the best approach is. For example, we could - Have a global user, shared by all users to get information we need from SharePoint. The downside is that we cannot filter SharePoint content to a particular user - We could store the users credentials when they log in, but that would only work for users authenticating via forms auth and would be a security issue that some users/clients would not like - Writing a SharePoint extension using WCF to allow us to access the information we need, however we'd still have the issue of figuring out how to impersonate the user we want. Neither of these options are ideal and in our investigation we came across the Claims Authentication/STS option which seems like it is trying to solve the problem we are having. So my question is, based on what I have written, is Claims/STS the best approach for us? We have not been able to find much direction on how to use this method to call into SharePoint from a Web Application and pass along the existing credentials. Does anyone have any experience with any of these issues?

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  • EOL Special Char not matching

    - by Aurélien Ribon
    Hello, I am trying to find every "a - b, c, d" pattern in an input string. The pattern I am using is the following : "^[ \t]*(\\w+)[ \t]*->[ \t]*(\\w+)((?:,[ \t]*\\w+)*)$" This pattern is a C# pattern, the "\t" refers to a tabulation (its a single escaped litteral, intepreted by the .NET String API), the "\w" refers to the well know regex litteral predefined class, double escaped to be interpreted as a "\w" by the .NET STring API, and then as a "WORD CLASS" by the .NET Regex API. The input is : a -> b b -> c c -> d The function is : private void ParseAndBuildGraph(String input) { MatchCollection mc = Regex.Matches(input, "^[ \t]*(\\w+)[ \t]*->[ \t]*(\\w+)((?:,[ \t]*\\w+)*)$", RegexOptions.Multiline); foreach (Match m in mc) { Debug.WriteLine(m.Value); } } The output is : c -> d Actually, there is a problem with the line ending "$" special char. If I insert a "\r" before "$", it works, but I thought "$" would match any line termination (with the Multiline option), especially a \r\n in a Windows environment. Is it not the case ?

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  • Fast sign in C++ float...are there any platform dependencies in this code?

    - by Patrick Niedzielski
    Searching online, I have found the following routine for calculating the sign of a float in IEEE format. This could easily be extended to a double, too. // returns 1.0f for positive floats, -1.0f for negative floats, 0.0f for zero inline float fast_sign(float f) { if (((int&)f & 0x7FFFFFFF)==0) return 0.f; // test exponent & mantissa bits: is input zero? else { float r = 1.0f; (int&)r |= ((int&)f & 0x80000000); // mask sign bit in f, set it in r if necessary return r; } } (Source: ``Fast sign for 32 bit floats'', Peter Schoffhauzer) I am weary to use this routine, though, because of the bit binary operations. I need my code to work on machines with different byte orders, but I am not sure how much of this the IEEE standard specifies, as I couldn't find the most recent version, published this year. Can someone tell me if this will work, regardless of the byte order of the machine? Thanks, Patrick

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  • When *not* to use prepared statements?

    - by Ben Blank
    I'm re-engineering a PHP-driven web site which uses a minimal database. The original version used "pseudo-prepared-statements" (PHP functions which did quoting and parameter replacement) to prevent injection attacks and to separate database logic from page logic. It seemed natural to replace these ad-hoc functions with an object which uses PDO and real prepared statements, but after doing my reading on them, I'm not so sure. PDO still seems like a great idea, but one of the primary selling points of prepared statements is being able to reuse them… which I never will. Here's my setup: The statements are all trivially simple. Most are in the form SELECT foo,bar FROM baz WHERE quux = ? ORDER BY bar LIMIT 1. The most complex statement in the lot is simply three such selects joined together with UNION ALLs. Each page hit executes at most one statement and executes it only once. I'm in a hosted environment and therefore leery of slamming their servers by doing any "stress tests" personally. Given that using prepared statements will, at minimum, double the number of database round-trips I'm making, am I better off avoiding them? Can I use PDO::MYSQL_ATTR_DIRECT_QUERY to avoid the overhead of multiple database trips while retaining the benefit of parametrization and injection defense? Or do the binary calls used by the prepared statement API perform well enough compared to executing non-prepared queries that I shouldn't worry about it? EDIT: Thanks for all the good advice, folks. This is one where I wish I could mark more than one answer as "accepted" — lots of different perspectives. Ultimately, though, I have to give rick his due… without his answer I would have blissfully gone off and done the completely Wrong Thing even after following everyone's advice. :-) Emulated prepared statements it is!

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  • Authenticating GTK app to run with root permissions

    - by Thomas Tempelmann
    I have a UI app (uses GTK) for Linux that requires to be run as root (it reads and writes /dev/disk*). Instead of requiring the user to open a root shell or use "sudo" manually every time when he launches my app, I wonder if the app can use some OS-provided API to ask the user to relaunch the app with root permissions. (Note: gtk app's can't use "setuid" mode, so that's not an option here.) The advantage here would be an easier workflow: The user could, from his default user account, double click my app from the desktop, and the app then would relaunch itself with root permission after been authenticated by the API/OS. I ask this because OS X offers exactly this: An app can ask the OS to launch an executable with root permissions - the OS (and not the app) then asks the user to input his credentials, verifies them and then launches the target as desired. I wonder if there's something similar for Linux (Ubuntu, e.g.) Update: The app is a remote operated disk repair tool for the unsavvy Linux user, and those Linux noobs won't have much understanding of using sudo or even changing their user's group memberships, especially if their disk just started acting up and they're freaking out. That's why I seek a solution that avoids technicalities like this.

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  • In asp.Net, writing code in the control tag generates compile error

    - by Nour Sabouny
    Hi this is really strange !! But look at the following asp code: <div runat="server" id="MainDiv"> <%foreach (string str in new string[]{"First#", "Second#"}) { %> <div id="<%=str.Replace("#","div") %>"> </div> <%} %> </div> now if you put this code inside any web page (and don't worry about the moral of this code, I made it just to show the idea) you'll get this error : Compiler Error Message: CS1518: Expected class, delegate, enum, interface, or struct Of course the error has nothing to do with the real problem, I searched for the code that was generated by asp.net and figured out the following : private void @__RenderMainDiv(System.Web.UI.HtmlTextWriter @__w, System.Web.UI.Control parameterContainer) { @__w.Write("\r\n "); #line 20 "blabla\blabla\Default.aspx" foreach (string str in new string[] { "First#", "Second#" }) { #line default #line hidden @__w.Write("\r\n <div id=\""); #line 22 "blabla\blabla\Default.aspx" @__w.Write(str.Replace("#", "div")); #line default #line hidden @__w.Write("\">\r\n "); } This is the code that was generated from the asp page and this is the method that is meant to render our div (MainDiv), I found out that there is a missing bracket "}" that closes the method or the (for loop). now the problem has three parts: 1- first you should have a server control (in our situation is the MainDiv) and I'm not sure if it is only the div tag. 2- HTML control inside the server control and a code inside it using the double quotation mark ( for example <div id="<%=str instead of <div id='<%=str. 3-Any keyword which has block brackets e.g.:for{},while{},using{}...etc. now removing any part, will solve the problem !!! how is this happening ?? any ideas ? BTW: please help me to make the question more obvious, because I couldn't find the best words to describe the problem.

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  • SubSonic 3.0 Simple Repository Adding a DateTime Property To An Object

    - by Blounty
    I am trying out SubSonic to see if it is viable to use on production projects. I seem to have stumbled upon an issue whith regards to updating the database with default values (String and DateTime) when a new column is created. If a new property of DateTime or String is added to an object. public class Bug { public int BugId { get; set; } public string Title { get; set; } public string Overview { get; set; } public DateTime TrackedDate { get; set; } public DateTime RemovedDate { get; set; } } When the code to add that type of object to the database is run var repository = new SimpleRepository(SimpleRepositoryOptions.RunMigrations); repository.Add(new Bug() { Title = "A Bug", Overview = "An Overview", TrackedDate = DateTime.Now }); it creates the following sql: UPDATE Bugs SET RemovedDate=''01/01/1900 00:00:00'' For some reason it is adding double 2 single quotes to each end of the string or DateTime. This is causing the following error: System.Data.SqlClient.SqlException - Incorrect syntax near '01' I am connecting to SQL Server 2005 Any help would be appreicated as apart from this issue i am finding SubSonic to be a great product. I have created a screen cast of my error here:

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  • .net c# cannot find img resources when open with exe

    - by okuryazar
    Hello, My exe processes text documents and I want to be able to right click on documents, select open with and point to my exe file. I can double click on my exe and choose a file to process with OpenFileDialog and it works fine. However, when I do open with, I get FileNotFound error. Here is the error log: System.IO.FileNotFoundException: attention.jpg at System.Drawing.Image.FromFile(String filename, Boolean useEmbeddedColorManagement) at System.Drawing.Image.FromFile(String filename) at ImzaDogrulamaUygulamasi.frmCertificate.FillTreeView() in D:\VSS\SOURCE\VS2008\EGA\ImzaDogrulamaUygulamasi\ImzaDogrulamaUygulamasi\frmCertificate.cs:line 76 at ImzaDogrulamaUygulamasi.frmCertificate.Form2_Load(Object sender, EventArgs e) in D:\VSS\SOURCE\VS2008\EGA\ImzaDogrulamaUygulamasi\ImzaDogrulamaUygulamasi\frmCertificate.cs:line 244 at System.Windows.Forms.Form.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) and this is how I add my images in my code, all resources are in the same directory with the exe file: ImageList myImageList = new ImageList(); myImageList.Images.Add(Image.FromFile("attention.jpg")); myImageList.Images.Add(Image.FromFile("sandglass.jpg")); myImageList.Images.Add(Image.FromFile("11.JPG")); myImageList.Images.Add(Image.FromFile("checkGif.jpg")); treeView1.ImageList = myImageList; Any help is much appreciated. Thanks

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