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  • Offtopic : how can I see my deleted question? Why it was deleted, but not closed?

    - by Tom
    I know it is offtopic and I will delete my question as soon as I get any answer, but somebody deleted my question. The question was opened for the whole day, but when I got 3 reopens and edited my question for asking for 2 more reopens to reopen my question, somebody deleted my question. It was about efficiency during the programming. Why somebody deleted my question and didn't let to be it closed? I found there many good answers although it was closed and now I can see absolutely nothing so I suppose it was deleted. Can somebody tell me smth?

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  • How to refresh DataGrid and DropDown on main page after hiding modal popup

    - by James
    Hi, I am adding records to a database from a modal popup. After hiding the modal popup, the page has not been refreshed even though I have Rebound the controls. I have reviewed a few postings on the web about this but the solution still evades me. I have attached my code after removing some of the extra detail... It seems I need to cause a postback but I don't know what needs to be changed. Some posts have talked about the extender being misplaced. Anyway, thank you James <asp:Content ID="Content1" ContentPlaceHolderID="Head" Runat="Server"> <div class="divBorder"> <asp:DataGrid id="dgrSessionFolders" runat="server" BorderWidth="2px" BorderStyle="Solid" BorderColor="#C0C0FF" Font-Names="Arial" Font-Bold="True" Font-Size="8pt" GridLines="Horizontal" AutoGenerateColumns="False" PageSize="9999" AllowPaging="False" OnItemCommand="dgrSessionFolders_Command" OnItemDataBound="CheckSessionFolderStatus" HorizontalAlign="Left" ForeColor="Blue" ShowFooter="True" CellPadding="2" OnSortCommand="dgrSessionFolders_Sort" AllowSorting="True"> </asp:DataGrid> </div> &nbsp;&nbsp;&nbsp; <asp:Label ID="Errormsg" runat="server" ForeColor="#CC0000"></asp:Label> <asp:UpdatePanel ID="UpdatePanel1" runat="server" RenderMode="Inline" ChildrenAsTriggers="false" UpdateMode="Conditional"> <Triggers> <asp:AsyncPostBackTrigger ControlID="btnEditTopic" /> <asp:AsyncPostBackTrigger ControlID="btnAdd" /> <asp:AsyncPostBackTrigger ControlID="btnUpdate" /> <asp:AsyncPostBackTrigger ControlID="btnDelete" /> <asp:AsyncPostBackTrigger ControlID="btnClear" /> <asp:AsyncPostBackTrigger ControlID="btnAddTopic" /> <asp:AsyncPostBackTrigger ControlID="btnUpdateTopic" /> <asp:AsyncPostBackTrigger ControlID="btnDeleteTopic" /> </Triggers> <ContentTemplate> <asp:panel id="pnl" runat="server" HorizontalAlign="Center" Height="48px" Width="100%" > &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <asp:ImageButton ID="btnEditTopic" runat="server" AlternateText="Edit Topic" ImageUrl="~/App_Themes/Common/images/BtnEditTopic.jpg" Height="28px"> </asp:ImageButton> <cc1:ModalPopupExtender ID="btnEditTopic_ModalPopupExtender" runat="server" BackgroundCssClass="modalBackground" DropShadow="true" Enabled="true" PopupControlID="pnlEditTopic" TargetControlID="btnEditTopicHidden" CancelControlID="btnEditTopicClose"> </cc1:ModalPopupExtender> <asp:ImageButton ID="btnAdd" runat="server" AlternateText="Add Folder" ImageUrl="~/App_Themes/Common/images/BtnAddFolder.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="btnUpdate" runat="server" AlternateText="Update Folder" ImageUrl="~/App_Themes/Common/images/BtnUpdateFolder.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="btnDelete" runat="server" AlternateText="Delete Folder" ImageUrl="~/App_Themes/Common/images/BtnDeleteFolder.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="BtnClear" runat="server" AlternateText="Clear Screen Input Fields" ImageUrl="~/App_Themes/Common/images/BtnAddMode.jpg" Height="28px"> </asp:ImageButton> <asp:Button ID="btnEditTopicHidden" runat="server" Enabled="false" Text="" Style="visibility: hidden" /> </asp:panel> <asp:Panel ID="pnlEditTopic" runat="server" CssClass="modalPopupEditTopic" Style="display: none;" > <table cellspacing="0" class="borderTable0" width="100%" style=""> <tr> <td colspan="10" class="Subhdr" align="center" style="width:100%"> <asp:label id="lblTopicScreenHdr" Cssclass="ScreenHdr" runat="server">Topic Maintenance</asp:label> </td> </tr> <tr> <td colspan="6"> <asp:Label ID="TopicPopErrorMsg" runat="server" ForeColor="#CC0000">&nbsp;</asp:Label> </td> </tr> <tr style="height:4px"> <td colspan="6" align="center"> <asp:ImageButton ID="btnAddTopic" runat="server" AlternateText="Add Topic" ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="btnUpdateTopic" runat="server" AlternateText="Update Topic" ImageUrl="~/App_Themes/Common/images/BtnApply.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="btnDeleteTopic" runat="server" AlternateText="Delete Topic" ImageUrl="~/App_Themes/Common/images/BtnDelete.jpg" Height="28px"> </asp:ImageButton> <asp:ImageButton ID="btnEditTopicClose" runat="server" AlternateText="Close Edit Topic Popup" ImageUrl="~/App_Themes/Common/images/BtnCancel.jpg" Height="28px"> </asp:ImageButton> </td> </tr> </table> </asp:Panel> </ContentTemplate> </asp:UpdatePanel> Private Sub btnAddTopic_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddTopic.Click 'Add the Topic table entry AddTopic() 'Display an informational message Errormsg.Text = "The Topic has been successfully added, thank you! " Errormsg.ForeColor = Drawing.Color.Blue 'Rebind the Topic Drop Down and set to added Topic ddlSessionTopic.DataBind() ddlSessionTopic.SelectedValue = drTopic("TOPC_ID") 'Rebind the Session Folders grid RebindGrid() 'Hide the Topic Popup btnEditTopic_ModalPopupExtender.Hide() End Sub Private Sub RebindGrid() cnnSQL = New SqlConnection(strConnection) cmdSQL = New SqlCommand("GetSessionFoldersForGrid", cnnSQL) cmdSQL.CommandType = CommandType.StoredProcedure cmdSQL.Parameters.Clear() cnnSQL.Open() dadSQL = New SqlDataAdapter(cmdSQL) dadSQL.SelectCommand = cmdSQL dadSQL.Fill(dtSessionFolderGrid) cnnSQL.Close() dvSessionFolderGrid = dtSessionFolderGrid.DefaultView dvSessionFolderGrid.Sort = String.Format("{0} {1}{2}", so.Sortfield, so.SortDirection, so.SortSuffix) dgrSessionFolders.DataSource = dvSessionFolderGrid dgrSessionFolders.DataBind() End Sub

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  • jqueryui themeroller

    - by cf_PhillipSenn
    I'm learning about the Framework Icons in jQuery UI. <span class="ui-icon ui-icon-circle-minus"></span> produces an icon of a minus sign inside a circle. Using the ThemeRoller Firefox Bookmarklet, I was able to change the color of the icon to red (to make it look like a delete button). Q: How can I make one jQueryUI icon be red and another one another color? <span class="ui-icon ui-icon-circle-plus"></span> I'd like to make this one green.

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  • compare a string and trim in vb.net

    - by referr
    I have this string that shall come in from another file. The string has maximum length of 102 digits. I need to compare the string with numbers in a pair and delete those form that string. e.g - 6125223659587412563265... till 102 numbers that compare with this string- first set - 61 new string = 25223659587412563265 second set - 36 new string = 252259587412563265 and so on. the set of numbers shall go to maximum of 51 pairs = 102, which shall give an end result of string = "" How can i achieve this in a loop?

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  • Best way to fetch data from a single database table with multiple threads?

    - by Ravi Bhatt
    Hi, we have a system where we collect data every second on user activity on multiple web sites. we dump that data into a database X (say MS SQL Server). we now need to fetch data from this single table from daatbase X and insert into database Y (say mySql). we want to fetch time based data from database X through multiple threads so that we fetch as fast as we can. Once fetched and stored in database Y, we will delete data from database X. Are there any best practices on this sort of design? any specific things to take care on table design like sharing or something? Are there any other things that we need to take care to make sure we fetch it as fast as we can from threads running on multiple machines? Thanks in advance! Ravi

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  • Problem with Variable Scoping in Rebol's Object

    - by Rebol Tutorial
    I have modified the rebodex app so that it can be called from rebol's console any time by typing rebodex. To show the title of the app, I need to store it in app-title: system/script/header/title so tha it could be used later in view/new/title dex reform [self/app-title version] That works but as you can see I have named the var name "app-title", but if I use "title" instead, the window caption would show weird stuff (vid code). Why ? REBOL [ Title: "Rebodex" Date: 23-May-2010 Version: 2.1.1 File: %rebodex.r Author: "Carl Sassenrath" Modification: "Rebtut" Purpose: "A simple but useful address book contact database." Email: %carl--rebol--com library: [ level: 'intermediate platform: none type: 'tool domain: [file-handling DB GUI] tested-under: none support: none license: none see-also: none ] ] rebodex.context: context [ app-title: system/script/header/title version: system/script/header/version set 'rebodex func[][ names-path: %names.r ;data file name-list: none fields: [name company title work cell home car fax web email smail notes updat] names: either exists? names-path [load names-path][ [[name "Carl Sassenrath" title "Founder" company "REBOL Technologies" email "%carl--rebol--com" web "http://www.rebol.com"]] ] brws: [ if not empty? web/text [ if not find web/text "http://" [insert web/text "http://"] error? try [browse web/text] ] ] dial: [request [rejoin ["Dial number for " name/text "? (Not implemented.)"] "Dial" "Cancel"]] dex-styles: stylize [ lab: label 60x20 right bold middle font-size 11 btn: button 64x20 font-size 11 edge [size: 1x1] fld: field 200x20 font-size 11 middle edge [size: 1x1] inf: info font-size 11 middle edge [size: 1x1] ari: field wrap font-size 11 edge [size: 1x1] with [flags: [field tabbed]] ] dex-pane1: layout/offset [ origin 0 space 2x0 across styles dex-styles lab "Name" name: fld bold return lab "Title" title: fld return lab "Company" company: fld return lab "Email" email: fld return lab "Web" brws web: fld return lab "Address" smail: ari 200x72 return lab "Updated" updat: inf 200x20 return ] 0x0 updat/flags: none dex-pane2: layout/offset [ origin 0 space 2x0 across styles dex-styles lab "Work #" dial work: fld 140 return lab "Home #" dial home: fld 140 return lab "Cell #" dial cell: fld 140 return lab "Alt #" dial car: fld 140 return lab "Fax #" fax: fld 140 return lab "Notes" notes: ari 140x72 return pad 136x1 btn "Close" #"^q" [store-entry save-file unview] ] 0x0 dex: layout [ origin 8x8 space 0x1 styles dex-styles srch: fld 196x20 bold across rslt: list 180x150 [ nt: txt 178x15 middle font-size 11 [ store-entry curr: cnt find-name nt/text update-entry unfocus show dex ] ] supply [ cnt: count + scroll-off face/text: "" face/color: snow if not n: pick name-list cnt [exit] face/text: select n 'name face/font/color: black if curr = cnt [face/color: system/view/vid/vid-colors/field-select] ] sl: slider 16x150 [scroll-list] return return btn "New" #"^n" [new-name] btn "Del" #"^d" [delete-name unfocus update-entry search-all show dex] btn "Sort" [sort names sort name-list show rslt] return at srch/offset + (srch/size * 1x0) bx1: box dex-pane1/size bx2: box dex-pane2/size return ] bx1/pane: dex-pane1/pane bx2/pane: dex-pane2/pane rslt/data: [] this-name: first names name-list: copy names curr: none search-text: "" scroll-off: 0 srch/feel: make srch/feel [ redraw: func [face act pos][ face/color: pick face/colors face system/view/focal-face if all [face = system/view/focal-face face/text search-text] [ search-text: copy face/text search-all if 1 = length? name-list [this-name: first name-list update-entry show dex] ] ] ] update-file: func [data] [ set [path file] split-path names-path if not exists? path [make-dir/deep path] write names-path data ] save-file: has [buf] [ buf: reform [{REBOL [Title: "Name Database" Date:} now "]^/[^/"] foreach n names [repend buf [mold n newline]] update-file append buf "]" ] delete-name: does [ remove find/only names this-name if empty? names [append-empty] save-file new-name ] clean-names: function [][n][ forall names [ if any [empty? first names none? n: select first names 'name empty? n][ remove names ] ] names: head names ] search-all: function [] [ent flds] [ clean-names clear name-list flds: [name] either empty? search-text [insert name-list names][ foreach nam names [ foreach word flds [ if all [ent: select nam word find ent search-text][ append/only name-list nam break ] ] ] ] scroll-off: 0 sl/data: 0 resize-drag scroll-list curr: none show [rslt sl] ] new-name: does [ store-entry clear-entry search-all append-empty focus name ; update-entry ] append-empty: does [append/only names this-name: copy []] find-name: function [str][] [ foreach nam names [ if str = select nam 'name [ this-name: nam break ] ] ] store-entry: has [val ent flag] [ flag: 0 if not empty? trim name/text [ foreach word fields [ val: trim get in get word 'text either ent: select this-name word [ if ent val [insert clear ent val flag: flag + 1] ][ if not empty? val [repend this-name [word copy val] flag: flag + 1] ] if flag = 1 [flag: 2 updat/text: form now] ] if not zero? flag [save-file] ] ] update-entry: does [ foreach word fields [ insert clear get in get word 'text any [select this-name word ""] ] show rslt ] clear-entry: does [ clear-fields bx1 clear-fields bx2 updat/text: form now unfocus show dex ] show-names: does [ clear rslt/data foreach n name-list [ if n/name [append rslt/data n/name] ] show rslt ] scroll-list: does [ scroll-off: max 0 to-integer 1 + (length? name-list) - (100 / 16) * sl/data show rslt ] do resize-drag: does [sl/redrag 100 / max 1 (16 * length? name-list)] center-face dex new-name focus srch show-names view/new/title dex reform [app-title version] insert-event-func [ either all [event/type = 'close event/face = dex][ store-entry unview ][event] ] do-events ] ]

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  • What event do I need to supress to stop IE from "Dinging" when I press enter in a text box?

    - by scunliffe
    On simple forms with one text box pressing enter submits the form (and this is great for easy search forms) However on a form with multiple fields, pressing Enter in an input="text" box won't do anything (e.g. submit) but in IE it "Dings" as if you have tried to delete an undeletable object. The question is... what event do I need to suppress in IE to stop this sound? e.g. if I have a username/password form, I DO want the enter key to submit the form, but I certainly don't want the "error" sound. Example site with the sound: http://www.sears.com/shc/s/StoreLocatorView?storeId=10153&catalogId=12605 Just press Enter in any of the text fields. Ding!, Ding!, Ding! Non-IE users, the sound is the: Program Events Windows Default Beep ("Windows XP Ding.wav")

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  • mysql database that can be accessed over a vpn?

    - by user225269
    I have 2 computers. Both with w7 as os. I have installed wampserver on one of them. I have mysql database on wampserver. Then I have made a vb.net program to connect to mysql database. I have put the program on both computers. What I want to do is for those two programs to see the same database that is on one computer. For them to be able to add, delete, update that 1 database. How do I do that? How do I network the mysql database? Do I also have to install wampserver on the other computer? What do I do? Please enlighten me.

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  • Empty accessors do matter? Regarding value types and their modification

    - by Petr
    Hi, I have following code that does not work due to "a" being a value typed. But I thought it would not work even without accessors, but it did: class Program { a _a //with accessors it WONT compile { get; set; } static void Main(string[] args) { Program p = new Program(); p._a.X = 5; //when both accessors are deleted, compiler does not //complain about _a.X not being as variable } } struct a { public int X; } It does not work as "a" is struct. But when I delete accessors from "_a" instance, it works. I do not understand why. Thanks

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  • What is wrong with mysql query?

    - by bala3569
    I use the following mysql query, DELIMITER $$ DROP PROCEDURE IF EXISTS `allied`.`aboutus_delete`$$ CREATE DEFINER=`allied`@`%` PROCEDURE `aboutus_delete`( IN p_Id int(11) ) BEGIN if exists(select aboutUsId from aboutus where aboutUsId=p_id and isDeleted=0) update aboutus set isDeleted=1 where aboutUsId=p_id else select 'No record to delete' END$$ DELIMITER ; But i get this error when i execute it... Error Code : 1064 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 'update aboutus set isDeleted=1 where aboutUsId=p_id else select 'No record to' at line 6

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  • Manual hunk editing in git interactive mode

    - by kRON
    In manual hunk edit mode, the docs say this: # To remove '-' lines, make them ' ' lines (context). # To remove '+' lines, delete them. # Lines starting with # will be removed. What I don't understand is how to remove '-' lines. Say if I had had this bit of code: Alfa Bejta And I've edited it in my working tree to: Alpha Beta The diff is: - Alfa - Bejta + Alpha + Beta How do I edit the hunk to only commit the modifications to the first line? I've tried these: - Alfa Bejta + Alpha - Alfa + Alpha Bejta to no avail.

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  • Override default operations order in LINQ

    - by Erick
    For one of our applications we do use LINQ to update a few reccords of the database. For business reasons we do require that only one item of a list to be primary. When we designed we decided to fire all of queries at the database at once. The problems occurs when we add one row and update the primary element to be the second item. See, the default behavior for order of operations with LINQ is to Insert, Update, Delete. If I Insert a first element I get a check constraint error with SQL Server. The best in my opinion would be to override and make sure to Update before Insert, this way we make sure that check constraints are kept. Tho there is not a lot of documentation on the mather. Any idea ?

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  • DROP TABLE fails for temp table

    - by StarBright
    I have a client application that creates a temp table, the performs a bulk insert into the temp table, then executes some SQL using the table before deleting it. Pseudo-code: open connection begin transaction CREATE TABLE #Temp ([Id] AS int) bulk insert 500 rows into #Temp UPDATE [OtherTable] SET [Status]=0 WHERE [Id] IN (SELECT [Id] FROM #Temp) AND [Group]=1 DELETE FROM #Temp WHERE [Id] IN (SELECT [Id] FROM [OtherTable] WHERE [Group]=1) INSERT INTO [OtherTable] ([Group], [Id]) SELECT 1 as [Group], [DocIden] FROM #Temp DROP TABLE #Temp COMMIT TRANSACTION CLOSE CONNECTION This is failing with an error on the DROP statement: Cannot drop the table '#Temp', because it does not exist or you do not have permission. I can't imagine how this failure could occur without something else going on first, but I don't see any other failures occurring before this. Is there anything that I'm missing that could be causing this to happen?

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  • How to use DAOs with hibernate/jpa?

    - by Ari
    Assuming the DAO structure and component interaction described below, how should DAOs be used with persistence layers like hibernate and toplink? What methods should/shouldn't they contain? Would it be bad practice to move the code from the DAO directly to the service? For example, let's say that for every model we have a DAO (that may or may not implement a base interface) that looks something like the following: public class BasicDao<T> { public List<T> list() { ... } public <T> retrieve() { ... } public void save() { ... } public void delete() { ... } } Component interaction pattern is -- service DAO model

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  • Sync a WinForm with DatagridView

    - by Ruben Trancoso
    I have a Form with a DataGridView which DataSource is a BindingSource to a table. This view will have a single row selection and a button to delete, edit the current selected row in a popup Form and a insert button that will use the same Form as well. My question is how can I sync the pop Form with the current row? I tryied to use the RowStateChanged event to get and store the current selected Row to be used in the Form but I coudnt. After the event I get the row that was selected before. Other thing I dont understand yet in C# how to have a single recordSet and know wich is the current record even if its a new being inserted in a way that once in the Form all data being entered will show up at the same time in the DataGridView.

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  • How can I get this code involving unique_ptr to compile?!

    - by Neil G
    #include <vector> #include <memory> using namespace std; class A { public: A(): i(new int) {} A(A const& a) = delete; A(A &&a): i(move(a.i)) {} unique_ptr<int> i; }; class AGroup { public: void AddA(A &&a) { a_.emplace_back(move(a)); } vector<A> a_; }; int main() { AGroup ag; ag.AddA(A()); return 0; } does not compile... (says that unique_ptr's copy constructor is deleted) I tried replacing move with forward. Not sure if I did it right, but it didn't work for me.

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  • Should I stop redirecting after successful POST or PUT requests?

    - by Andres Jaan Tack
    It seems common in the Rails community, at least, to respond to successful POST, PUT or DELETE requests by redirecting instead of returning success. For instance, if I PUT a legal change to my user profile, the idiomatic response would be a 302 Redirect to the profile page. Isn't this wrong? Shouldn't we be returning 200 OK from the request? Or a 201 Created, in the case of a POST request? Either of those, in the HTTP/1.1 Status Definitions are allowed to (or required to) include a response, anyway. I guess I'm wondering, before I go and "fix" my application, whether there is there a darn good reason why the community has gone the way of redirects instead of successful responses.

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  • How can I run a user script before any inline scripts run on a webpage?

    - by Telanor
    I want to make a greasemonkey type script for firefox that runs before the scripts on the page. Greasemonkey scripts run after scripts on the page, so that won't work. The reason I need this is because I want to edit one of the scripts on the page. Specifically, I want to delete a script that forces the page to load inside a frame since having the page inside a frame breaks F5 (Pressing F5 makes the page jump back to the front page instead of reloading the current page). Also, I don't want to load the page through a proxy with AJAX and switching to chrome/opera is not an option either. I was thinking maybe the Jetpack add-on would work but it seems to only have the same event that greasemonkey uses, DOMContentLoaded. Any ideas?

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  • FTP in NetBeans 6.1

    - by Ross
    Is there an FTP browser hiding away in NetBeans 6.1? The help manual doesn't even suggest FTP exists. All I've been able to find so far is a tree viewer in the Services panel (no edit controls) and the ability to upload projects, folders and specific files from the Projects/Files views. Is there anywhere to delete or rename or will I have to keep switching back to my browser? I can see from the previews that there's a nice FTP controller in 6.5 but I'm not desperate enough to completely convert to a beta (yet).

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  • Magic behind R.java file

    - by LambergaR
    Hi! Recently I have been having quite some problems with R.java file. Now I have decided to do a backup and delete the file to see what happens. Nothing happened, so I created an empty R.java file and hopped for the best. Now Eclipse seems to figure out that the file was tempered with and even issues a warning: R.java was modified manually! Reverting to generated version! And that's all there is. I tried building it manually but got no results. So, I have two questions: 1. what should I do to force Eclipse to generate the file 2. what is happening here? How is the file created, where is the code that is generating the file? I would appreciate any help. As usual the problem occurred just a few days before the deadline :)

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  • Joining Multiple Projects in one solution

    - by PCAddict
    I have started creating a game, and I added a second project, it's the standard XNA Windows game 3.1 project, and since the other project already had a Main to start the program and the 2nd is for game data, where as the first was for the drawing and graphical side of things (menu's etc) I thought I would remove the Main method, and now all I get are Errors saying there isn't a Valid main method, I tried to make it dependant on the other (since this data is loaded at run time and is such as quests/items etc) but it still wont let me run the solution at all. the code for the main method is still in the 1st project, and if I delete the 2nd project it runs fine, although no game data so I only get menus... Thank you in advance for any assistance.

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  • Most common C# bitwise operations

    - by steffenj
    For the life of me, I can't remember how to set, delete, toggle or test a bit in a bitfield. Either I'm unsure or I mix them up because I rarely need these. So a "bit-cheat-sheet" would be nice to have. For example: flags = flags | FlagsEnum.Bit4; // Set bit 4. or if ((flags == FlagsEnum.Bit4)) == FlagsEnum.Bit4) // Is there a less verbose way? Can you give examples of all the other common operations, preferably in C# syntax using a [Flags] enum?

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  • How do laziness and I/O work together in Haskell?

    - by Bill
    I'm trying to get a deeper understanding of laziness in Haskell. I was imagining the following snippet today: data Image = Image { name :: String, pixels :: String } image :: String -> IO Image image path = Image path <$> readFile path The appeal here is that I could simply create an Image instance and pass it around; if I need the image data it would be read lazily - if not, the time and memory cost of reading the file would be avoided: main = do image <- image "file" putStrLn $ length $ pixels image But is that how it actually works? How is laziness compatible with IO? Will readFile be called regardless of whether I access pixels image or will the runtime leave that thunk unevaluated if I never refer to it? If the image is indeed read lazily, then isn't it possible I/O actions could occur out of order? For example, what if immediately after calling image I delete the file? Now the putStrLn call will find nothing when it tries to read.

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  • Changing resource file in new version of an app

    - by Michael Frost
    Hi, I'm working on an update for an already existing iphone app. The existing version contains a .sql database file which is used in the app. I would like to use a new version of this file in the update of the app. On the first startup of the existing app the .sql file is placed in the caches directory of the users iphone. From what I can understand from Apple's documentation the files in the caches directory might get copied from the old app to the new versions caches directory when the user updates the app. Does this mean that for being sure my new file is used in the updated version I should use a different name of the file? And what happens with the old file? Do I have to manually delete it from inside the app? Which means I have to check if it's there at every startup of the app? Thanks Michael

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  • resource acquisition is initialization "RAII"

    - by hitech
    in the example below class X{ int *r; public: X(){cout<< X is created ; r new int[10]; } ~X(){cout<< X is destroyed ; delete [] r; } }; class Y { public: Y(){ X x; throw 44; } ~Y(){cout<< Y is destroyed ;} }; I got this example of RAII from one site and ave some doubts. please help. in the contructor of x we are not considering the scenation "if the memory allocation fails" . Here for the destructor of Y is safe as in y construcotr is not allocating any memory. what if we need to do some memory allocation also in y constructor?

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