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  • XAML trigger as StaticResource

    - by adrianm
    Why can't I create a trigger and use it as a static resource in XAML? <Window.Resources> <Trigger x:Key="ValidationTrigger" x:Shared="False" Property="Validation.HasError" Value="true"> <Setter Property="FrameworkElement.ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)/ErrorContent}"/> </Trigger> <Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}"> <Style.Triggers> <StaticResource ResourceKey="ValidationTrigger"/> </Style.Triggers> </Style> </Window.Resources> I get an errormessage at runtime "Value cannot be null. Parameter name: triggerBase Error at object 'System.Windows.Markup.StaticResourceHolder' in markup file"

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  • delphi insert update record´s

    - by ml
    Hi friends what is that im doing wrong because it goes and goes on LOOP var ii: Integer; i: Integer; j: Integer; ie : integer; je : integer; fileSource, fileDest: string; Fo : TSHFileOpStruct; buffer : array[0..4096] of char; p : pchar; dirFile: String; dirFile1: String; dirFile11: String; begin dirFile1 := (Dirlocal + 'Vibrometria\'+ClienteN.text+'\'); dirFile := (localAplicação+ 'Vibrometria\'+ClienteN.text+'\'+NInterv.text ) ; dirFile11:= Dirlocal+'Vibrometria\'; if ForceDirectories(dirFile11) then if ForceDirectories(dirFile1) then //...................................................................... begin ShowMessage('Vai devolver "'+cxDBTextEdit5.Text+'..........' +obra.Text); Sub_TRelFinal.First; Begin ADOTable_casa.First; Begin begin Sub_TRelFinal.Edit; //Tabela1Codoco.Value := Tabela2Codoco.Value; Sub_TRelFinal.FieldByName('Foto1').text := ADOTable_casa.FieldByName('Foto1').text; Sub_TRelFinal.FieldByName('Obra').text := ADOTable_casa.FieldByName('Obra').text; Sub_TRelFinal.FieldByName('OBS1').text := ADOTable_casa.FieldByName('OBS1').text; Sub_TRelFinal.FieldByName('Data_VisitaLocal').text := ADOTable_casa.FieldByName('Data_VisitaLocal').text; Sub_TRelFinal.FieldByName('ContractoN').text := ADOTable_casa .FieldByName('ContractoN').text;; Sub_TRelFinal.FieldByName('Cliente').text := ADOTable_casa .FieldByName('Cliente').text; Sub_TRelFinal.FieldByName('Morada').text := ADOTable_casa .FieldByName('Morada').text; Sub_TRelFinal.FieldByName('localizacao').text:= ADOTable_casa .FieldByName('localizacao').text; Sub_TRelFinal.FieldByName('Intruducao').text:= ADOTable_casa .FieldByName('Intruducao').text; Sub_TRelFinal.FieldByName('Analise').text := ADOTable_casa.FieldByName('Analise').text; Sub_TRelFinal.Post; end; End; end; //iniciar inserção registos sub Sub_TRelFinal_1.First; For j := 1 to Sub_TRelFinal_1.RecordCount do Begin ADOTable_casa_sub_1.First; For i := 1 To ADOTable_casa_sub_1.RecordCount Do Begin begin Sub_TRelFinal_1.Edit; //Tabela1Codoco.Value := Tabela2Codoco.Value; Sub_TRelFinal_1.FieldByName('Foto1').text := ADOTable_casa_sub_1.FieldByName('Foto1').text; Sub_TRelFinal_1.FieldByName('Obra').text := ADOTable_casa_sub_1.FieldByName('Obra').text; Sub_TRelFinal_1.FieldByName('OBS1').text := ADOTable_casa_sub_1.FieldByName('OBS1').text; Sub_TRelFinal_1.FieldByName('Data_VisitaLocal').text := ADOTable_casa_sub_1.FieldByName('Data_VisitaLocal').text; Sub_TRelFinal_1.FieldByName('ContractoN').text := ADOTable_casa_sub_1.FieldByName('ContractoN').text; Sub_TRelFinal_1.FieldByName('Cliente').text := ADOTable_casa_sub_1.FieldByName('Cliente').text; Sub_TRelFinal_1.FieldByName('Morada').text := ADOTable_casa_sub_1.FieldByName('Morada').text; Sub_TRelFinal_1.FieldByName('localizacao_eq').text:= ADOTable_casa_sub_1.FieldByName('localizacao_eq').text; Sub_TRelFinal_1.FieldByName('Equipamento').text:= ADOTable_casa_sub_1.FieldByName('Equipamento').text; Sub_TRelFinal_1.FieldByName('tipo_equip').text := ADOTable_casa_sub_1.FieldByName('tipo_equip').text; Sub_TRelFinal_1.Post; end; //iniciar inserção registos subsub SubTRelFinal_sub.First; For ie := 1 to SubTRelFinal_sub.RecordCount do Begin ADOTable_casa_sub_Sub.First; For je := 1 To ADOTable_casa_sub_Sub.RecordCount Do begin SubTRelFinal_sub.Edit; //Tabela1Codoco.Value := Tabela2Codoco.Value; SubTRelFinal_sub.FieldByName('Foto1').text := ADOTable_casa_sub_Sub.FieldByName('Foto1').text; SubTRelFinal_sub.FieldByName('Foto2').text := ADOTable_casa_sub_Sub.FieldByName('Foto2').text; SubTRelFinal_sub.FieldByName('Analisefoto1').text := ADOTable_casa_sub_Sub.FieldByName('Analisefoto1').text; SubTRelFinal_sub.FieldByName('Observações').text := ADOTable_casa_sub_Sub.FieldByName('Observações').text;; SubTRelFinal_sub.FieldByName('ContractoN').text := ADOTable_casa_sub_Sub.FieldByName('ContractoN').text; SubTRelFinal_sub.FieldByName('OBS3').text := ADOTable_casa_sub_Sub.FieldByName('OBS3').text; SubTRelFinal_sub.FieldByName('OBS4').text := ADOTable_casa_sub_Sub.FieldByName('OBS4').text; SubTRelFinal_sub.FieldByName('OBS2').text := ADOTable_casa_sub_Sub.FieldByName('OBS2').text; SubTRelFinal_sub.FieldByName('OBS1').text := ADOTable_casa_sub_Sub.FieldByName('OBS1').text; SubTRelFinal_sub.FieldByName('Localização').text := ADOTable_casa_sub_Sub.FieldByName('Localização').text; SubTRelFinal_sub.FieldByName('Tipo_equipamento').text:= ADOTable_casa_sub_Sub.FieldByName('Tipo_equipamento').text; SubTRelFinal_sub.FieldByName('Analisefoto101').text:= ADOTable_casa_sub_Sub.FieldByName('Analisefoto101').text; SubTRelFinal_sub.FieldByName('Analisefoto201').text := ADOTable_casa_sub_Sub.FieldByName('Analisefoto201').text; SubTRelFinal_sub.FieldByName('GrauAnomalia').text := ADOTable_casa_sub_Sub.FieldByName('GrauAnomalia').text; SubTRelFinal_sub.Post; end; ADOTable_casa_sub_Sub.Next; End; SubTRelFinal_sub.Next; End; ADOTable_casa_sub_1.Next; End; Sub_TRelFinal_1 .Next;

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  • SQLite INTERSECT gives a huge performance decrease

    - by Derk
    I have a query that runs in less than 1 ms: SELECT product_to_value.category AS category, features.name AS featurename, featurevalues.name AS valuename FROM product_to_value, features, featurevalues WHERE product_to_value.category IN(:int, :bla, :bla1) AND product_to_value.feature = features.int AND product_to_value.value = featurevalues.int LIMIT 10 However, when I combine it with another query using INTERSECT, the query now takes more than 250ms: SELECT product_to_value.category AS category, features.name AS featurename, featurevalues.name AS valuename FROM product_to_value, features, featurevalues WHERE product_to_value.category IN(:int, :bla, :bla1) AND product_to_value.feature = features.int AND product_to_value.value = featurevalues.int INTERSECT SELECT product_to_value.category AS category, features.name AS featurename, featurevalues.name AS valuename FROM product_to_value, features, featurevalues WHERE product_to_value.category IN(:int, :bla, :bla1) AND product_to_value.feature = features.int AND product_to_value.value = featurevalues.int LIMIT 10 This can't be right. I've tried several index combinations, for example an index on all columns I use in my query, but to no avail. I've tried compound indexes as well, but they only slow things down even more. I have read a few things about SQLite and how it treats indexes. I know SQLite is capable of delivering sick performance, and surely I must be overlooking something.

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  • Read cookies in silverlight

    - by Dharam Narayan
    hi, I have an ASP.NET MVC application. In this after user get Sign in .We set the a cookie for the user who logged in using FormsAuthentication.SetAuthCookie(userName, false). In other page we get the Cookies using the FormsAuthentication.GetAuthCookie(userName]) . This cookie values as string is then set in the Response.Cookies["username"].Value = cookiesvalue . We have .aspx page in the same application that downloads silverlight application .Silverlight reads the cookies using the code string[] cookies = HtmlPage.Document.Cookies.Split(';'); The problem is that once session expires in the application,silverlight cannot read the cookie value. After the session expires we again set the cookies in headers using the Response.Cookies["username"].Value = cookiesvalue . But still silverlight application cannot read this cookie . Thanks in Advance DNM

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  • [iPhone] Objective-C : UIScrollView manual paging

    - by Daniel
    Hi Folks! I want to use the scrollview as something like a picker in horizontal mode. The scrollview holds up to seven subviews. Each subview represents a value. Always three views are visible and the one in the middle is the selected one. Scrollview visible at start: __ | V1 | V2 Scrollview set to view/value two: V1 | V2 | V3 Scrollview set to last value: V2 | V3 | __ The real problem I have got is the "pagingEnabled" flag. If pagingEnabled is set to YES the scrollview pages always three subviews/values instead of only one. If pagingEnabled is set to NO the scrollview does not clinch. Is there a nice solution for my problem? Thanks a lot, Dan ;)

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  • jquery select item in radiobuttonlist via client-side function

    - by mcliedtk
    I have the following ASP.NET RadioButtonList: <asp:RadioButtonList ID="rbl" runat="server"> <asp:ListItem Text="Type1" Value="1" /> <asp:ListItem Text="Type2" Value="2" /> </asp:RadioButtonList> I would like to select an item in the list programmatically via a client-side jquery function like this (simplified version): function BindWidget(widget) { // Type property of Widget is an int. $("#<%=rbl.ClientID%>").selectItemByValue(widget.Type); } Ideally, there is some function - in the above code I have proposed selectItemByValue - that selects an item in a RadioButtonList by a given value. Does jquery have a similar function built-in? If not, how should I go about implementing the desired functionality?

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  • insert and mofigy a record in an entity using Core Data

    - by aminfar
    I tried to find the answer of my question on the internet, but I could not. I have a simple entity in Core data that has a Value attribute (that is integer) and a Date attribute. I want to define two methods in my .m file. First method is the ADD method. It takes two arguments: an integer value (entered by user in UI) and a date (current date by default). and then insert a record into the entity based on the arguments. Second method is like an increment method. It uses the Date as a key to find a record and then increment the integer value of that record. I don't know how to write these methods. (assume that we have an Array Controller for the table in the xib file)

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  • ASPX has image from portal.mxlogic.com

    - by codie
    I have a aspx page I'm trying to (remotely) debug. It should add an image and set the src. The value seems correct if i msgbox the value that should be used for the "ImageUrl" But viewing the page there is no image and the src is: http://portal.mxlogic.com/images/transparent.gif This is a mcaffee page so is this some security thing...that is just a wild\crazy guess. Maybe i'm missing something very obvious...I did not write the code and I'm not really a aspx developer. Any ideas?? llf as requested some code... TableCell tc = new TableCell(); {code to create imgurl ... very specific to this situation} MessageBox(imgurl); //The imgurl value here is correct if (imgurl != null) { image.ImageUrl = imgurl; } else { MessageBox("image url is null"); } tc.Controls.Add(image); tr.Cells.Add(tc); Table1.Rows.Add(tr)

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  • f:ajax problem JSF

    - by Nitesh Panchal
    This is my code :- <p:carousel var="item" animate="true" circular="true" rows="2" effect="easeOutStrong" value="#{RegisterBean.objBlogTemplateList}"> <h:inputHidden id="hdnBlogTemplateId" binding="#{RegisterBean.hdnBlogTemplateId}" value="#{item.templateId}"/> <h:graphicImage alt="#{item.templatePicName}" style="border: solid 5px white;width: 200px;height: 200px;" value="#{app:getCommonImagePath(item.templatePicName)}"> <f:ajax event="click" execute="hdnBlogTemplateId" listener="#{RegisterBean.setBlogTheme}"/> </h:graphicImage> </p:carousel> This is my managed bean code :- private HtmlInputHidden hdnBlogTemplateId; public HtmlInputHidden getHdnBlogTemplateId() { return hdnBlogTemplateId; } public void setHdnBlogTemplateId(HtmlInputHidden hdnBlogTemplateId) { this.hdnBlogTemplateId = hdnBlogTemplateId; } public void setBlogTheme(AjaxBehaviorEvent e){ System.out.println("Hello"); //System.out.println(hdnBlogTemplateId.getValue()); //System.out.println(objGraphic.toString()); } Hello is never printed in my console. Please help.

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  • How can I bind a winforms Opacity to a TrackBar (slider)

    - by Allen
    I've got a winform with a BindingSource that has an int property named Opacity in its DataSource. I also have a TrackBar on the winform that I want to use to control the Opacity of the winform. I've bound the Value property on the TrackBar to the Opacity and that functions just fine, sliding the TrackBar will change the variable from TrackBar.Minimum (0) to TrackBar.Maximum (1). I've also bound the Opacity property of the winform to this value, however, since the TrackBar's values only go from Minimum to Maximum in +/-1 rather than +/- .1 or so (like Opacity does), it doesn't properly fade the winform. Instead, 0 will turn it opaque and 1 will turn it fully visible. I need a way to work within the architecture described above, but get the TrackBar to change its value from 0 to 1 in defined increments smaller than 1.

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  • Jquery get attribute of few ul to create another attribute

    - by Josemalive
    Hello, I have the following HTML: <ul actualpage=0> <li/> <li/> .... </ul> <ul actualpage=0> <li/> <li/> .... </ul> Im trying to get the value of actualpage of each ul and create a new attribute. Its easy but not in one jquery sentence... Its possible? Until now i have the following line (between ## simbols the missing part that i need. /* select all uls with attribute actualpage and create a new attribute on each with the current actualpage value */ $('ul[actualpage]').attr('newactualpage',##Current value of actualpage attr of UL##);

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  • Is there any difference between null and 0 when assigning to pointers in unsafe code?

    - by Eloff
    This may seem odd, but in C (size_t)(void*)0 == 0 is not guaranteed by the language spec. Compilers are allowed to use any value they want for null (although they almost always use 0.) In C#, you can assign null or (T*)0 to a pointer in unsafe code. Is there any difference? (long)(void*)0 == 0 (guaranteed or not? put another way: IntPtr.Zero.ToInt64() == 0) MSDN has this to say about IntPtr.Zero: "The value of this field is not equivalent to null." Well if you want to be compatible with C code, that makes a lot of sense - it'd be worthless for interop if it didn't convert to a C null pointer. But I want to know if IntPtr.Zero.ToInt64() == 0 which may be possible, even if internally IntPtr.Zero is some other value (the CLR may or may not convert null to 0 in the cast operation) Not a duplicate of this question

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  • ASP.NET MVC 2 RC2 Model Binding with NVARCHAR NOT NULL column

    - by Gary McGill
    I have a database column defined as NVARCHAR(1000) NOT NULL DEFAULT(N'') - in other words, a non-nullable text column with a default value of blank. I have a model class generated by the Linq-to-SQL Classes designer, which correctly identifies the property as not nullable. I have a TextAreaFor in my view for that property. I'm using UpdateModel in my controller to fetch the value from the form and populate the model object. If I view the web page and leave the text area blank, UpdateModel insists on setting the property to NULL instead of empty string. (Even if I set the value to blank in code prior to calling UpdateModel, it still overwrites that with NULL). Which, of course, causes the subsequent database update to fail. I could check all such properties for NULL after calling UpdateModel, but that seems ridiculous - surely there must be a better way? Please don't tell me I need a custom model binder for such a simple scenario...!

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  • putting multibinding on a single line in xaml

    - by Adam S
    Is there a way to take this multibinding: <TextBox.IsEnabled> <MultiBinding Converter="{StaticResource LogicConverter}"> <Binding ElementName="prog0_used" Path="IsEnabled" /> <Binding ElementName="prog0_used" Path="IsChecked" /> </MultiBinding> </TextBox.IsEnabled> and put is all on one line, as in <TextBox IsEnabled="" />? If so, where can I learn the rules of this formattiong?

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  • WPF Error when implementing Login.xaml

    - by LnDCobra
    I am getting the following exception: "Nullable object must have a value" Everything was working when I was using StartupURI="MainWindow.xaml" but I wanted to implement a login screen so I changed this to Startup="Application_Startup" and then created the following method in App.xaml.cs: private void Application_Startup(object sender, StartupEventArgs e) { UpdateAccounts(); bool result = true; ///* LoginWindow login = new LoginWindow(); result = login.ShowDialog().Value; /* */ if (!result) { return; } MainWindow window = new MainWindow(); bool main = window.ShowDialog().Value; } Does anyone have any idea what is going on? Or any suggestions on what is the best practice for implementing login interface.

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  • Prevent SQL injection from form-generated SQL - NO PreparedStmts

    - by Markos Fragkakis
    Hi all, I have a search table where user will be able to filter results with a filter of the type: Field [Name], Value [John], Remove Rule Field [Surname], Value [Blake], Remove Rule Field [Has Children], Value [Yes], Remove Rule Add Rule So the user will be able to set an arbitrary set of filters, which will result essentially in a completely dynamic WHERE clause. In the future I will also have to implement more complicated logical expressions, like Where (name=John OR name=Nick) AND (surname=Blake OR surname=Bourne), Of all 10 fields the user may or may not filter by, I don't know how many and which filters the user will set. So, I cannot use a prepared statement (which assumes that at least we know the fields in the WHERE clause). This is why prepared statements are unfortunately out of the question, I have to do it with plain old, generated SQL. What measures can I take to protect the application from SQL Injection (REGEX-wise or any other way)?

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  • Can't manage iPod from linux anymore

    - by kemp
    I used to be able to see and manage my iPod with different softwares: Amarok, Rhythmbox, GTKPod. The device is a nano 1st generation 4gb. Currently it mounts regularly and can be accessed from the file system, but I get this in dmesg: [ 1547.617891] scsi 11:0:0:0: Direct-Access Apple iPod 1.62 PQ: 0 ANSI: 0 [ 1547.619103] sd 11:0:0:0: Attached scsi generic sg2 type 0 [ 1547.620478] sd 11:0:0:0: [sdb] Adjusting the sector count from its reported value: 7999488 [ 1547.620494] sd 11:0:0:0: [sdb] 7999487 512-byte hardware sectors: (4.09 GB/3.81 GiB) [ 1547.621718] sd 11:0:0:0: [sdb] Write Protect is off [ 1547.621726] sd 11:0:0:0: [sdb] Mode Sense: 68 00 00 08 [ 1547.621732] sd 11:0:0:0: [sdb] Assuming drive cache: write through [ 1547.623591] sd 11:0:0:0: [sdb] Adjusting the sector count from its reported value: 7999488 [ 1547.624993] sd 11:0:0:0: [sdb] Assuming drive cache: write through [ 1547.625003] sdb: sdb1 sdb2 [ 1547.629686] sd 11:0:0:0: [sdb] Attached SCSI removable disk [ 1548.084026] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! [ 1548.369502] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! [ 1548.504358] FAT: invalid media value (0x2f) [ 1548.504363] VFS: Can't find a valid FAT filesystem on dev sdb1. [ 1548.945173] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! [ 1548.945179] FAT: invalid media value (0x2f) [ 1548.945182] VFS: Can't find a valid FAT filesystem on dev sdb1. [ 1610.092886] usb 2-6: USB disconnect, address 9 The only application that can access it (partially) is Rhythmbox. I say partially because I can transfer files to the iPod but can't remove or modify them. Also one transfer didn't finish and only 9 out of 16 songs were delivered to the device. All other softwares I tried (GTKPod, Amarok, Songbird) don't even detect it. What can I do to troubleshoot this? EDIT: # fdisk -l /dev/sdb Disk /dev/sdb: 4095 MB, 4095737344 bytes 241 heads, 62 sectors/track, 535 cylinders Units = cylinders of 14942 * 512 = 7650304 bytes Disk identifier: 0x20202020 Device Boot Start End Blocks Id System /dev/sdb1 1 11 80293+ 0 Empty Partition 1 has different physical/logical beginnings (non-Linux?): phys=(0, 1, 1) logical=(0, 1, 2) Partition 1 has different physical/logical endings: phys=(9, 254, 63) logical=(10, 181, 8) Partition 1 does not end on cylinder boundary. /dev/sdb2 11 536 3919415+ b W95 FAT32 Partition 2 has different physical/logical beginnings (non-Linux?): phys=(10, 0, 7) logical=(10, 181, 15) Partition 2 has different physical/logical endings: phys=(497, 240, 62) logical=(535, 88, 61) EDIT2: The "before" state is hard to tell, it was a lot of updates ago. Haven't been using my iPod for a while so I can't say when exactly it stopped working. I'm sure Amarok was still at version 1.X but can't remember when it was. My current system is debian testing fully updated. NOTE: just noticed that if I mount the device manually instead of letting nautilus automount it, I can see it again on GTKPod but still not on Banshee AND it's vanished from Rhythmbox...

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  • PHP - How to use Php inside Php?

    - by Dodi300
    Hello. Can someone tell/show me how to use PHP inside PHP. I'm trying to make the URL of an image change depending on what value is in a MySQL database. Here's an example of what I'm trying to do. Bear in mind that $idx already has a value from the URL of the page. <?php $query = "SELECT * FROM comment WHERE uname='$idx'"; $result = mysql_query($query); while($row = mysql_fetch_array($result, MYSQL_ASSOC)) { echo "<img src='' name='comm' width='75px' height='60px' id='mainimage' />"; } ?> How would I make the source value, for the image, come from a different table?

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  • Powerbuilder Dynamic Array Manipulation

    - by TomatoSandwich
    string array[] long lBound, uBound lBound = LowerBound(array[]) // = 1, empty array value uBound = UpperBound(array[]) // = 0, empty array value array[1] = 'Item 1' array[2] = 'Item 2' array[3] = 'Item 3' lBound = LowerBound(array[]) // = 1 uBound = UpperBound(array[]) // = 3 array[3] = '' //removing item 3 lBound = LowerBound(array[]) // = 1, still uBound = UpperBound(array[]) // = 3, still (but array[3] is nulled? I think the line 'array[3]' is wrong, but I think I've read that this should remove the array cell. What would be the right way to remove an array cell? Does it depend on object type? (String vs Number vs Object) Or Can one manipulate the UpperBound value to make it work? i.e. after removing Item 3, I want the UpperBound, or arraylength, to be 2, since this is logically correct.

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  • better way to pass by reference in Perl?

    - by JoelFan
    I am doing pass-by-reference like this: sub repl { local *line = \$_[0]; our $line; $line = "new value"; } sub doRepl { my $foo = "old value"; my ($replFunc) = @_; $replFunc->($foo); print $foo; # prints "new value"; } doRepl(\&repl); Is there a cleaner way of doing it? Prototypes don't work because I'm using a function reference (trust be that there's a good reason for using a function reference). I also don't want to use $_[0] everywhere in repl because it's ugly.

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  • RSS feed for gas prices and how to intepret the feed

    - by subh
    I am trying to adda RSS feed of gas prices based on location to my application. I google for RSS feed for gas prices and bumped onto Motortrend's gas price feed http://www.motortrend.com/widgetrss/gas- The feed seems to be fine, but the price value seem to be depcited in alphatbets as below Chevron 3921 Irvine Blvd, Irvine, CA 92602 (0.0 miles) Monday, May 10, 2010 9:16 AM Regular: ZEIECHK Plus: ZEHGIHC Premium: ZEGJEGE Diesel: N/A How do I interpret these value to come up with a value for the gas price? Or is it internal to Motortrend's and cannot be used elsewhere?

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  • Cassandra/HBase or just MySQL: Potential problems doing the next thing

    - by alexeypro
    Say I have "user". It's the key. And I need to keep "user count". I am planning to have record with key "user" and value "0" to "9999+ ;-)" (as many as I'll have). What problems I will drive in if I use Cassandra, HBase or MySQL for that? Say, I have thousand of new updates to this "user" key, where I need to increment the value. Am I in trouble? Locked for writes? Any other way of doing that? Why this is done -- there will be a lot of "user"-like keys. Different other cases. But the idea is the same. Why keep it this way -- because I'll have more reads, so I can always get "counted value" very fast.

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  • Can I check the validity of a single DataMapper property?

    - by Nathan Long
    In a custom DataMapper setter, I'd like to check whether the value I'm setting is valid or not. For instance: class ToastMitten include DataMapper::Resource property :id, Serial property :wearer, Enum['Chuck Norris', 'Jon Skeet'] property :first_worn_at, DateTime def wearer=(name) super if wearer.valid? # How can I do this? first_worn_at = Time.now end end end t = ToastMitten.new t.wearer = 'Nathan Long' # invalid value; do NOT set first_worn_at t.wearer = 'Jon Skeet' # valid value; set first_worn_at Can I check the validity of a single property like this without calling valid? on the object itself and looking through all the errors?

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