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• Why do open source projects cling on 0.x versions for too long?

  - by ssg

  I see many open source projects insist on staying in 0.xxx version for a very long time despite that the product has been proven useful and very stable. Trac is one example. They even risked switching from 0.9 to 0.10 which might confuse a lot of users about which is more recent. I wonder if this is a cultural paradigm, an honor code in open source community or simply a strict interpretation of release cycle management? Would a person who releases first version as "1.0 beta" be banished from open source world, or more realistically appeal less number of contributors? For some projects it even looks like they will never switch to 1.0 ever but only approximating only half way each time, like Zeno's paradox.

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• Inverse Factorial Function (Prolog)

  - by user2796815

  I have to write a Prolog program to computer the inverse of factorial function without using division. I was also given the note: "the inverse of a function is not necessarily a function". I have this is a normal factorial predicate.. fact(0,1). fact(N,F) :- N0, N1 is N-1, fact(N1,F1), F is N * F1. I've read on some other posts that you should be able to just switch around the arguments, but that doesn't seem to be the case with this version. Could anyone help me out with figuring out why?

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• Coda Clips for Vim

  - by XLR3204S

  I'm currently trying to switch from Coda (a Mac IDE) to Vim. One thing I loved about Coda and my knowledge of Vim cannot replace were the so-called "clips". Basically, you type, say, "new", press TAB, and the text is replaced with a basic XHTML page. And you can add as many keyword/clips combinations as you want. The most I could get with Vim so far was to create a new file containing my clip, and then use :r FILE in Vim in order to get it inserted, but this is not a very elegant solution, as I'd have to carry these clips around in every directory I have a file I want to use my clips with. So assuming I've explained things properly, what would be my choices?

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• C# System.Diagnostics.Debugger.Debug() stopped working

  - by Andrew Miner

  I'm working on a program which uses the System.Diagnostics.Debugger.Break() method to allow the user to set a breakpoint from the command-line. This has worked fine for many weeks now. However, when I was working on fixing a unit test today, I tried to use the debug switch from the command-line, and it didn't work. Here's what I've tried: I've confirmed that the Debug() method is really being called (by putting a System.Console.WriteLine() after it) I've confirmed that the build is still in Debug I've done a clean build I've restarted Product Studio A quick Google search didn't reveal anything, and the API documentation for .Net doesn't mention anything about this function not performing correctly. So... any ideas?

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• Using setSourceType with image picker up hides status bar

  - by Aaron

  I am pretty sure this is a bug but I thought I would check. I used the camera overlay to add a button so that on the iphone a user can switch from the camera view to the photo library. When button is taped the source type switches fine but the status bar is missing from the photo library. Throughout the rest of that session the status bar remains missing from all views evet thougth isStatusBarHidden reports NO. This is how the camera overlay view is created if (cameraOverlayView == nil) { [[NSBundle mainBundle] loadNibNamed:@"CameraOverlayView" owner:self options:nil]; } If camera is available this is when I set source type and add overlay if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { [imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera]; [imagePicker setCameraOverlayView:cameraOverlayView]; } Here is the action statement to change source type. (IBAction)selectImage; { [imagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary]; } If I don't tap the button on the overlay there is no problem with the status bar. PS. I did submit a bug report on this.

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• How do I use Eval() to reference values in a SortedDictionary in an asp Repeater?

  - by MatthewMartin

  I thought I was clever to switch from the memory intensive DataView to SortedDictionary as a memory efficient sortable data structure. Now I have no idea how get the key and value out of the datasource in the <%# or Eval() expressions. SortedDictionary<int, string> data = RetrieveNames(); rCurrentTeam.DataSource = data; rCurrentTeam.DataBind(); <asp:Repeater ID="rNames" runat="server"> <ItemTemplate> <asp:Label ID="lblName" runat="server" Text='<%# Eval("what?") %>' /> </ItemTemplate> </asp:Repeater> Any suggestions?

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• About enumerations in Delphi and c++ in 64-bit environments

  - by sum1stolemyname

  I recently had to work around the different default sizes used for enumerations in Delphi and c++ since i have to use a c++ dll from a delphi application. On function call returns an array of structs (or records in delphi), the first element of which is an enum. To make this work, I use packed records (or aligned(1)-structs). However, since delphi selects the size of an enum-variable dynamically by default and uses the smallest datatype possible (it was a byte in my case), but C++ uses an int for enums, my data was not interpreted correctly. Delphi offers a compiler switch to work around this, so the declaration of the enum becomes {$Z4} TTypeofLight = ( V3d_AMBIENT, V3d_DIRECTIONAL, V3d_POSITIONAL, V3d_SPOT ); {$Z1} My Questions are: What will become of my structs when they are compiled on/for a 64-bit environment? Does the default c++ integer grow to 8 Bytes? Are there other memory alignment / data type size modifications (other than pointers)?

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• Separate functionality depending on Role in ASP.NET MVC

  - by Andrew Bullock

  I'm looking for an elegant pattern to solve this problem: I have several user roles in my system, and for many of my controller actions, I need to deal with slightly different data. For example, take /Users/Edit/1 This allows a Moderator to edit a users email address, but Administrators to edit a user's email address and password. I'd like a design for separating the two different bits of action code for the GET and the POST. Solutions I've come up with so far are: Switch inside each method, however this doesn't really help when i want different model arguments on the POST :( Custom controller factory which chooses a UsersController_ForModerators and UsersController_ForAdmins instead of just UsersController from the controller name and current user role Custom action invoker which choose the Edit_ForModerators method in a similar way to above Have an IUsersController and register a different implementation of it in my IoC container as a named instance based on Role Build an implementation of the controller at runtime using Castle DynamicProxy and manipulate the methods to those from role-based implementations Im preferring the named IoC instance route atm as it means all my urls/routing will work seamlessly. Ideas? Suggestions?

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• Presenting MVC to Old C++ Spaghetti Coders?

  - by leeand00

  I wish to present the idea of MVC to a bunch of old C++ spaghetti coders (at my local computer club). One of them that has alot of influence on the rest of the group seems to finally be getting the idea of encapsulation (largely due in part to this website). I was hoping that I could also point him in the right direction by showing him Model View Controller, but I need to do it in a way that makes sense to him, as well as it probably needs to be written in C/C++! I realize that MVC is a very old architectural pattern so it would seem to me that there should be something out there that would do the job. I'm more of a web developer, so I was wondering if anybody out there who is a good C/C++ coder could tell me what it is that made the MVC light switch turn on in your head.

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• Debugging JavaScript in Internet Explorer

  - by Erik W

  I am working on a relatively complex JavaScript-driven website. It runs great in all browsers except Internet Explorer. I am getting this very curious error: "A Runtime Error has occurred. Do you wish to Debug? Line: 93,865,600. Error: Expected ';'" The issue is, I don't have 93 million lines of code, and clicking "Yes" doesn't attach to Visual Studio like it normally does. I can click on 'No' and the website continues to run fine, but if a user doesn't have JavaScript debugging disabled, I don't want them to see this meaningless error. Suggestions/Tools/Plugins to get to the bottom of this? And yeah, I learned my lesson, switch over and check my project in Internet Explorer more often... Thanks,

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• Help porting a bit of Prototype JavaScript to jQuery

  - by ewall

  I have already implemented some AJAX pagination in my Rails app by using the example code for the will_paginate plugin--which is apparently using Prototype. But if I wanted to switch to using jQuery for future additions, I really don't want to have the Prototype stuff sitting around too (yes, I know it's possible). I haven't written a lick of JavaScript in years, let alone looked into Prototype and jQuery... so I could use some help converting this bit into jQuery-compatible syntax: document.observe("dom:loaded", function() { // the element in which we will observe all clicks and capture // ones originating from pagination links var container = $(document.body) if (container) { var img = new Image img.src = '/images/spinner.gif' function createSpinner() { return new Element('img', { src: img.src, 'class': 'spinner' }) } container.observe('click', function(e) { var el = e.element() if (el.match('.pagination a')) { el.up('.pagination').insert(createSpinner()) new Ajax.Request(el.href, { method: 'get' }) e.stop() } }) } }) Thanks in advance!

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• What causes my borderless C++ app to crash when overriding WndProc?

  - by Ste

  I use a form with border NONE. I need to override WndProc for resize and move form. However, using this code, my app crashes! static const int WM_NCHITTEST = 0x0084; static const int HTCLIENT = 1; static const int HTCAPTION = 2; protected: virtual void Form1::WndProc(System::Windows::Forms::Message %m) override { switch (m.Msg) { case WM_NCHITTEST: if (m.Result == IntPtr(HTCLIENT)) { m.Result = IntPtr(HTCAPTION); } break; } Form1::WndProc(m); } virtual System::Windows::Forms::CreateParams^ get() override { System::Windows::Forms::CreateParams^ cp = __super::CreateParams; cp->Style |= 0x40000; return cp; } How can I fix my code not to crash but still allow my form to be moved and resized?

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• Removing JPanel from a JFrame in netbeans

  - by jt153

  So, I have several JPanels that contain buttons, labels, etc. that I want to switch between from a main JFrame. Currently I am trying to use the this.add(JPanelname); method and this.remove(JPanelname); with the validate(); and repaint(); methods The problem is it will add the panel to the JFrame but it will not remove it. I am not sure how exactly to go about this and any help would be greatly appreciated.

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• DialogBox in Win32 - Prevent multiple instance

  - by UK

  Hello all, I have a program which creates DialogBox window when user clicks the menu item from tray icon, case ID_OPTIONS: DialogBox ( GetModuleHandle ( NULL ), MAKEINTRESOURCE ( IDD_SETUP_DIALOG ), hWnd, reinterpret_cast<DLGPROC>(SetupDlgProc) ); return 0; But the problem here is everytime when users clicks item from tray , a new instance of the dialogbox appears. Is there anyway to prevent this multiple instance ? BTW, my SetupDlgProc looks like this, BOOL CALLBACK SetupDlgProc ( HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam ) { switch ( Message ) { case WM_INITDIALOG: ... } } Thanks for your help.

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• Will MyISAM type tables work better than InnoDB for large numbers of columns?

  - by Ethan

  I have a MySQL InnoDB table with 238 columns. 56 of them are TEXT type, 27 are VARCHAR(255). I am getting MySQL error 139 when users insert data sometimes. After research I found that I'm probably running into InnoDB row size/column size/column count limitations. (I'm putting it that way because the specific limits among those three things are interdependent.) Docs on InnoDB give an idea of the limits. If I switch this table to MyISAM is it likely to solve the problem? I understand the maximum row size of 65,535 bytes. I think I'm hitting InnoDB's additional 8000 byte limit somehow. Switching to PostgreSQL is also a remote option, but would take much longer.

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• PHP include() alternative?

  - by Adrian M.

  Hello, I want to know if my code is safe and if there are other safer alternatives to include external files.. So this is my code example, is it safe? How can I make it safer? Thanks! <?php switch($_GET['p']){ case 'test1': include 'test1.php'; break; case 'test2': include 'test2.php'; break; case 'test': echo 'something'; include 'pages/test.php'; echo 'something'; break; default: include 'main.php'; break; } ?>

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• How do you handle large repeated UI elements with JQuery

  - by jpoz

  Howdy, Here's the situation: You have a very complex UI element that is repeated in a list. Each has a menu on it, buttons, it hides and shows subelements, buttons for switch it's state, etc, etc. The elements are populated via JSON so you have to construct the elements and the functionality of the fly. What's the best way to accomplish this with JQuery? Where would you save the reusable template for the DOM structure? How would you add the behavior on? $().live? .livequery? onclick? manual after every JSON get? I guess I just see a lot of people doing different things. What's your experience with performance? Any insight would be much appreciated. Thanks, JPoz

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• Best way to simplify this code, more efficient

  - by Derek

  My question is, is there a way to make this code more efficient or write it in a simple way? javascript by the way. switch (tempvar1) { case 1: currentSlide = 'slide1'; showaslide('ppslide1'); break; case 2: currentSlide = 'slide2'; showaslide('ppslide2'); break; case 3: currentSlide = 'slide3'; showaslide('ppslide3'); break; case 4: currentSlide = 'slide4'; showaslide('ppslide4'); break; case 5: currentSlide = 'slide5'; showaslide('ppslide5'); break; case 6: currentSlide = 'slide6'; showaslide('ppslide6'); break; // 20 total cases }

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• "Genie" animation effect in XAML

  - by ScottCate

  What would the XAML look like to create a Genie animation effect? Take an object of any size/shape, and "Genie" it to another Minimized location. Kind of like the OSX window minimize. Maybe even a little fancier through a smoke-like effect where the path is more switch back, instead of a simple funnel (if that makes any sense). I'm guessing that there is some sort of Path that could be drawn, and the shape could move and transform along that path. Just a wild guess. Thanks for your ideas.

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• Changing MSSQL Database sorting

  - by plaisthos

  I have a request to change the collation of a MS SQL Database: ALTER DATABASE solarwind95 collate SQL_Latin1_General_CP1_CI_AS but I get this strange error: Meldung 5075, Ebene 16, Status 1, Zeile 1 Das 'Spalte'-Objekt 'CustomPollerAssignment.PollerID' ist von 'Datenbanksortierung' abhängig. Die Datenbanksortierung kann nicht geändert werden, wenn ein schemagebundenes Objekt von ihr abhängig ist. Entfernen Sie die Anhängigkeiten der Datenbanksortierung, und wiederholen Sie den Vorgang. Sorry for the german errror message. I do not know how to switch the language to english, but here is a translation: Translation: Message 5075, Layer 16, Status 1, Row 1 The 'column' object 'CustomPollerAssignment.PollerID' depends on 'Database sorting. The database sorting cannot be changed if a schema bound object depends on it. Remove the dependency of the database sortieren and retry. I got a ton more of the errors like that.

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• connecting to a webservice from android - AsyncTask or Service?

  - by football

  I'm writing an android app that will connect to a REST/JSON webservice. Users will be retrieving information, uploading comments, downloading and uploading images etc. I know that I shouldn't keep all this network communication in the Activity/UI thread, as it will cause ANRs. What I'm confused about is whether I should use an AsyncTask or a Service with "manual" threading to accomplish this; With a Service, I'd simply have a public method for each method in the webservice's API. I'd then implement threading within each of these methods. If I used an AsyncTask, I would create a helper class that defined AsyncTasks for each method in the webservice's API. Which method is preferred? Interaction with the webservice will only happen while the user is in the Activity. Once they switch to another application, or exit the program, there is no need for communication with the webservice.

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• How to make distributed builds using XCode 3.2 on OS X 10.6

  - by Sorin Sbarnea

  After I upgraded using a clean install from OS X 10.5 to 10.6.2 and upgraded the XCode to 3.2.1 I wasn't able to use distributed builds feature anymore. There are several issues that I detected: In most cases Bonjour is not detecting the other computers even they are on the same switch. I added a custom 'set' where I added manually the IP addreses of each computer. Even so I still get status: "unreachable" on them.BTW, ping does work without problems. Both share my computer for shared workgroup builds (distcc) and distribute builds via shared workgroup builds options are checked.

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• Browser mode and document mode in IE9

  - by Ozzone

  I use the Developer Tools in IE9 to switch between IE7, 8 & 9 Browser Modes for testing markup & CSS. I use following combinations. IE7 Browser Mode + Document mode IE7 Standards IE8 Browser Mode + Document mode IE8 Standards IE9 Browser Mode + Document mode IE9 Standards But, if i use following combination, few design's position issues are occured. IE9 Browser Mode + IE7 Standards Is the above combination valid? or Does i need to change Document mode forcefully?

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• How do you make an in-place construction of a struct casted to array compile in Visual C++ 2008?

  - by Irwin1138

  I'm working with quite a big codebase which compiles fine in linux but vc++ 2008 spits errors. The problem code goes like this: Declaration: typedef float vec_t; typedef vec_t vec2_t[2]; The codebase is littered with in-place construction like this one: (vec2_t){0, divs} Or more complex: (vec2_t){ 1/(float)Vid_GetScreenW(), 1/(float)Vid_GetScreenH()} As far as I know, this code constructs a struct, then converts it to an array and passes the address to the function. I personally never used in-place construction like this so I have no clue how to make this one work. I don't maintain the linux build, only the windows one. And I can't get it to compile. Is there some switch, some macro to make vc++ compile it? Maybe there is a similar nifty way to construct those arrays and pass them to the functions in-place that compiles just fine in vc++?

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• Core Plot: only works ok with three plots

  - by Luis

  I am adding a scatter plot to my app (iGear) so when the user selects one, two or three chainrings combined with a cogset on a bike, lines will show the gears meters. The problem is that Core Plot only shows the plots when three chainrings are selected. I need your help, this is my first try at Core Plot and I'm lost. My code is the following: iGearMainViewController.m - (IBAction)showScatterIpad:(id)sender { cogsetToPass = [NSMutableArray new]; arrayForChainringOne = [NSMutableArray new]; arrayForChainringTwo = [NSMutableArray new]; arrayForChainringThree = [NSMutableArray new]; //behavior according to number of chainrings switch (self.segmentedControl.selectedSegmentIndex) { case 0: // one chainring selected for (int i = 1; i<= [cassette.numCogs intValue]; i++) { if (i <10) { corona = [NSString stringWithFormat:@"cog0%d",i]; }else { corona = [NSString stringWithFormat:@"cog%d",i]; } float one = (wheelSize*[_oneChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; float teeth = [[cassette valueForKey:corona] floatValue]; [cogsetToPass addObject:[NSNumber numberWithFloat:teeth]]; [arrayForChainringOne addObject:[NSNumber numberWithFloat:one]]; } break; case 1: // two chainrings selected for (int i = 1; i<= [cassette.numCogs intValue]; i++) { if (i <10) { corona = [NSString stringWithFormat:@"cog0%d",i]; }else { corona = [NSString stringWithFormat:@"cog%d",i]; } float one = (wheelSize*[_oneChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; //NSLog(@" gearsForOneChainring = %@",[NSNumber numberWithFloat:one]); float two = (wheelSize*[_twoChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; [cogsetToPass addObject:[NSNumber numberWithFloat:[[cassette valueForKey:corona]floatValue]]]; [arrayForChainringOne addObject:[NSNumber numberWithFloat:one]]; [arrayForChainringTwo addObject:[NSNumber numberWithFloat:two]]; } break; case 2: // three chainrings selected for (int i = 1; i<= [cassette.numCogs intValue]; i++) { if (i <10) { corona = [NSString stringWithFormat:@"cog0%d",i]; }else { corona = [NSString stringWithFormat:@"cog%d",i]; } float one = (wheelSize*[_oneChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; float two = (wheelSize*[_twoChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; float three = (wheelSize*[_threeChainring.text floatValue]/[[cassette valueForKey:corona]floatValue])/1000; [cogsetToPass addObject:[cassette valueForKey:corona]]; [arrayForChainringOne addObject:[NSNumber numberWithFloat:one]]; [arrayForChainringTwo addObject:[NSNumber numberWithFloat:two]]; [arrayForChainringThree addObject:[NSNumber numberWithFloat:three]]; } default: break; } ScatterIpadViewController *sivc = [[ScatterIpadViewController alloc]initWithNibName: @"ScatterIpadViewController" bundle:nil]; [sivc setModalTransitionStyle:UIModalTransitionStyleFlipHorizontal]; sivc.records = [cassetteNumCogs integerValue]; sivc.cogsetSelected = self.cogsetToPass; sivc.chainringOne = self.arrayForChainringOne; sivc.chainringThree = self.arrayForChainringThree; sivc.chainringTwo = self.arrayForChainringTwo; [self presentViewController:sivc animated:YES completion:nil]; } And the child view with the code to draw the plots: ScatterIpadViewController.m #pragma mark - CPTPlotDataSource methods - (NSUInteger)numberOfRecordsForPlot: (CPTPlot *)plot { return records; } - (NSNumber *)numberForPlot: (CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index{ switch (fieldEnum) { case CPTScatterPlotFieldX: return [NSNumber numberWithInt:index]; break; case CPTScatterPlotFieldY:{ if ([plot.identifier isEqual:@"one"]==YES) { //NSLog(@"chainringOne objectAtIndex:index = %@", [chainringOne objectAtIndex:index]); return [chainringOne objectAtIndex:index]; }else if ([plot.identifier isEqual:@"two"] == YES ){ //NSLog(@"chainringTwo objectAtIndex:index = %@", [chainringTwo objectAtIndex:index]); return [chainringTwo objectAtIndex:index]; }else if ([plot.identifier isEqual:@"three"] == YES){ //NSLog(@"chainringThree objectAtIndex:index = %@", [chainringThree objectAtIndex:index]); return [chainringThree objectAtIndex:index]; } default: break; } } return nil; } The error returned is an exception on trying to access an empty array. 2012-11-15 11:02:42.962 iGearScatter[3283:11603] Terminating app due to uncaught exception 'NSRangeException', reason: ' -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' First throw call stack: (0x1989012 0x1696e7e 0x192b0b4 0x166cd 0x183f4 0x1bd39 0x179c0 0x194fb 0x199e1 0x43250 0x14b66 0x13ef0 0x13e89 0x3b5753 0x3b5b2f 0x3b5d54 0x3c35c9 0x5c0814 0x392594 0x39221c 0x394563 0x3103b6 0x310554 0x1e87d8 0x27b3014 0x27a37d5 0x192faf5 0x192ef44 0x192ee1b 0x29ea7e3 0x29ea668 0x2d265c 0x22dd 0x2205 0x1)* libc++abi.dylib: terminate called throwing an exception Thank you!

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