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• Core Data Model Design Question - Changing "Live" Objects also Changes Saved Objects

  - by mwt

  I'm working on my first Core Data project (on iPhone) and am really liking it. Core Data is cool stuff. I am, however, running into a design difficulty that I'm not sure how to solve, although I imagine it's a fairly common situation. It concerns the data model. For the sake of clarity, I'll use an imaginary football game app as an example to illustrate my question. Say that there are NSMO's called Downs and Plays. Plays function like templates to be used by Downs. The user creates Plays (for example, Bootleg, Button Hook, Slant Route, Sweep, etc.) and fills in the various properties. Plays have a to-many relationship with Downs. For each Down, the user decides which Play to use. When the Down is executed, it uses the Play as its template. After each down is run, it is stored in history. The program remembers all the Downs ever played. So far, so good. This is all working fine. The question I have concerns what happens when the user wants to change the details of a Play. Let's say it originally involved a pass to the left, but the user now wants it to be a pass to the right. Making that change, however, not only affects all the future executions of that Play, but also changes the details of the Plays stored in history. The record of Downs gets "polluted," in effect, because the Play template has been changed. I have been rolling around several possible fixes to this situation, but I imagine the geniuses of SO know much more about how to handle this than I do. Still, the potential fixes I've come up with are: 1) "Versioning" of Plays. Each change to a Play template actually creates a new, separate Play object with the same name (as far as the user can tell). Underneath the hood, however, it is actually a different Play. This would work, AFAICT, but seems like it could potentially lead to a wild proliferation of Play objects, esp. if the user keeps switching back and forth between several versions of the same Play (creating object after object each time the user switches). Yes, the app could check for pre-existing, identical Plays, but... it just seems like a mess. 2) Have Downs, upon saving, record the details of the Play they used, but not as a Play object. This just seems ridiculous, given that the Play object is there to hold those just those details. 3) Recognize that Play objects are actually fulfilling 2 functions: one to be a template for a Down, and the other to record what template was used. These 2 functions have a different relationship with a Down. The first (template) has a to-many relationship. But the second (record) has a one-to-one relationship. This would mean creating a second object, something like "Play-Template" which would retain the to-many relationship with Downs. Play objects would get reconfigured to have a one-to-one relationship with Downs. A Down would use a Play-Template object for execution, but use the new kind of Play object to store what template was used. It is this change from a to-many relationship to a one-to-one relationship that represents the crux of the problem. Even writing this question out has helped me get clearer. I think something like solution 3 is the answer. However if anyone has a better idea or even just a confirmation that I'm on the right track, that would be helpful. (Remember, I'm not really making a football game, it's just faster/easier to use a metaphor everyone understands.) Thanks.

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• Filtered ListView not updated

  - by Anton

  Hi! I have a ListView with a custom Adapter that extends ArrayAdapter. It's a ArrayAdapter of Type Artist. Artist is a very small class that has a name and an id. The Artist Class has toString() overridden to return just the name. I have an EditText. The EditText has an TextChangeListener where i call .getFilter().filter(chars, callback) on my adapter. In the Filter.Filterlistener().onComplete() callback i print the count and it looks really good. As i type the count decreases. So it seams everything works as advertised, but the List stays the same. I tried to call artistAdapter.notifyDataSetChanged() to force the list to redraw, but nothing happens. [see 2.)] I am tinkering around for days now! I am desperate.. Hopefully someone can have a look on my code and tell me what i am doing wrong! Thanks! Here is what i have done: 1.) Defined a ListView and an EditText like this: <EditText xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/list_search_text" android:layout_width="fill_parent" android:layout_height="35dip" android:layout_below="@id/header"> </EditText> <ListView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/list_search" android:layout_width="fill_parent" android:layout_height="fill_parent"> </ListView> 2.) Setup my ListView in the Activities onCreate(): private ListView listView = null; private ArtistAdapter artistAdapter = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.search_artists); artistAdapter = new ArtistAdapter(this, R.layout.row, list); // 'list' is an ArrayList<Artist> listView = (ListView) findViewById(R.id.list_search); listView.setAdapter(artistAdapter); listView.setFastScrollEnabled(true); listView.setTextFilterEnabled(true); listView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> av, View v, int position, long id) { // do something } }); EditText txtSearch = (EditText) findViewById(R.id.list_search_text); txtSearch.addTextChangedListener(new TextWatcher() { public void afterTextChanged(Editable arg0) { } public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { } public void onTextChanged(CharSequence chars, int start, int before, int count) { artistAdapter.getFilter().filter(chars, new Filter.FilterListener() { public void onFilterComplete(int count) { Log.d(Config.LOG_TAG, "filter complete! count: " + count); artistAdapter.notifyDataSetChanged(); } }); } }); } 3.) This is my ArtistAdapter in short. I added an remove() and add() method: public class ArtistAdapter extends ArrayAdapter<Artist> implements SectionIndexer { private List<Artist> items; /* other stuff like overridden getView, getPositionForSection, getSectionForPosition and so on */ @Override public void remove(Artist object) { super.remove(object); items.remove(object); } @Override public void add(Artist object) { super.add(object); items.add(object); } } 4.) My artist has also the toString() overridden: public class Artist implements Comparable<Artist> { public String uid; public String name; public Artist(String id, String name) { this.uid = id; this.name = name; } public int compareTo(Artist another) { return this.name.compareToIgnoreCase(another.name); } @Override public String toString() { return this.name; } }

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• UIButton addTarget:action:forControlEvents: results in [NSObject doesNotRecognizeSelector:]

  - by Teodor

  Hi. I tried a lot of stuff, still no result. So I have the following button created programatically in a subclass of UIViewController: rightButton = [UIButton buttonWithType:UIButtonTypeCustom]; rightButton.frame = CGRectMake(0.0, 0.0, 110.0, 40.0); rightButton.titleLabel.font = [UIFont fontWithName:GAME_FONT_NAME_STRING size:20.0]; [rightButton setTitle:@"MyTitle" forState:UIControlStateNormal]; rightButton.backgroundColor = [UIColor clearColor]; [rightButton setTitleColor:[UIColor greenColor] forState:UIControlStateNormal]; [rightButton setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted]; [rightButton setBackgroundImage:normalImage forState:UIControlStateNormal]; [rightButton setBackgroundImage:highlightedImage forState:UIControlStateHighlighted]; [rightButton addTarget:self action:@selector(myButton) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:rightButton]; where the selector is: - (void)myButton; I tried everything: - (void)myButton; - (void)myButton:(id)sender; - (void)myButton:(id)sender forEvent:(UIEvent *)event; - (IBAction)myButton; - (IBAction)myButton:(id)sender; - (IBAction)myButton:(id)sender forEvent:(UIEvent *)event; and the corresponding selectors, of course: [rightButton addTarget:self action:@selector(myButton) forControlEvents:UIControlEventTouchUpInside]; [rightButton addTarget:self action:@selector(myButton:) forControlEvents:UIControlEventTouchUpInside]; [rightButton addTarget:self action:@selector(myButton:forEvent:) forControlEvents:UIControlEventTouchUpInside]; [rightButton addTarget:self action:@selector(myButton) forControlEvents:UIControlEventTouchUpInside]; [rightButton addTarget:self action:@selector(myButton:) forControlEvents:UIControlEventTouchUpInside]; [rightButton addTarget:self action:@selector(myButton:forEvent:) forControlEvents:UIControlEventTouchUpInside]; The result is always an uncaught exception - [NSObject doesNotRecognizeSelector:]. However, the usual backtrace of the program is: #0 0x92a6bedb in objc_msgSend () #1 0x03b0a430 in ?? () #2 0x00306b4e in -[UIControl sendAction:to:forEvent:] () #3 0x00308d6f in -[UIControl(Internal) _sendActionsForEvents:withEvent:] () #4 0x00307abb in -[UIControl touchesEnded:withEvent:] () #5 0x002bcddf in -[UIWindow _sendTouchesForEvent:] () #6 0x002a67c8 in -[UIApplication sendEvent:] () #7 0x002ad061 in _UIApplicationHandleEvent () #8 0x02498d59 in PurpleEventCallback () #9 0x01cabb80 in CFRunLoopRunSpecific () #10 0x01caac48 in CFRunLoopRunInMode () #11 0x02497615 in GSEventRunModal () #12 0x024976da in GSEventRun () #13 0x002adfaf in UIApplicationMain () So what is the problem with that button? PS: I am using the iPhone SDK 3.1.3 Update! The following code in the AppDelegate (no declarations in the interface): - (void)applicationDidFinishLaunching:(UIApplication *)application { UIButton *test = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 100.0)]; [test setTitle:@"Title" forState:UIControlStateNormal]; UIImage *bg = [UIImage imageNamed:...]; [test setBackgroundImage:bg forState:UIControlStateNormal]; [test addTarget:self action:@selector(testAction) forControlEvents:UIControlEventTouchUpInside]; [window addSubview:test]; [test release]; [window makeKeyAndVisible]; } - (void)testAction { NSLog(@"Write something..."); } works perfectly! But if I create an empty UIViewController with the same code: - (void)viewDidLoad { UIButton *test = [[UIButton alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 100.0)]; [test setTitle:@"Title" forState:UIControlStateNormal]; UIImage *bg = [UIImage imageNamed:...]; [test setBackgroundImage:bg forState:UIControlStateNormal]; [test addTarget:self action:@selector(testAction) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:test]; [test release]; [window makeKeyAndVisible]; } - (void)testAction { NSLog(@"Write something..."); } I get this mysterious error. :-( Help!

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• Simple Convention Automapper for two-way Mapping (Entities to/from ViewModels)

  - by Omu

  UPDATE: this stuff has evolved into a nice project, see it at http://valueinjecter.codeplex.com check this out, I just wrote a simple automapper, it takes the value from the property with the same name and type of one object and puts it into another, and you can add exceptions (ifs, switch) for each type you may need so tell me what do you think about it ? I did it so I could do something like this: Product –> ProductDTO ProductDTO –> Product that's how it begun: I use the "object" type in my Inputs/Dto/ViewModels for DropDowns because I send to the html a IEnumerable<SelectListItem> and I receive a string array of selected keys back public void Map(object a, object b) { var pp = a.GetType().GetProperties(); foreach (var pa in pp) { var value = pa.GetValue(a, null); // property with the same name in b var pb = b.GetType().GetProperty(pa.Name); if (pb == null) { //no such property in b continue; } if (pa.PropertyType == pb.PropertyType) { pb.SetValue(b, value, null); } } } UPDATE: the real usage: the Build methods (Input = Dto): public static TI BuildInput<TI, T>(this T entity) where TI: class, new() { var input = new TI(); input = Map(entity, input) as TI; return input; } public static T BuildEntity<T, TI, TR>(this TI input) where T : class, new() where TR : IBaseAdvanceService<T> { var id = (long)input.GetType().GetProperty("Id").GetValue(input, null); var entity = LocatorConfigurator.Resolve<TR>().Get(id) ?? new T(); entity = Map(input, entity) as T; return entity; } public static TI RebuildInput<T, TI, TR>(this TI input) where T: class, new() where TR : IBaseAdvanceService<T> where TI : class, new() { return input.BuildEntity<T, TI, TR>().BuildInput<TI, T>(); } in the controller: public ActionResult Create() { return View(new Organisation().BuildInput<OrganisationInput, Organisation>()); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult Create(OrganisationInput o) { if (!ModelState.IsValid) { return View(o.RebuildInput<Organisation,OrganisationInput, IOrganisationService>()); } organisationService.SaveOrUpdate(o.BuildEntity<Organisation, OrganisationInput, IOrganisationService>()); return RedirectToAction("Index"); } The real Map method public static object Map(object a, object b) { var lookups = GetLookups(); var propertyInfos = a.GetType().GetProperties(); foreach (var pa in propertyInfos) { var value = pa.GetValue(a, null); // property with the same name in b var pb = b.GetType().GetProperty(pa.Name); if (pb == null) { continue; } if (pa.PropertyType == pb.PropertyType) { pb.SetValue(b, value, null); } else if (lookups.Contains(pa.Name) && pa.PropertyType == typeof(LookupItem)) { pb.SetValue(b, (pa.GetValue(a, null) as LookupItem).GetSelectList(pa.Name), null); } else if (lookups.Contains(pa.Name) && pa.PropertyType == typeof(object)) { pb.SetValue(b, pa.GetValue(a, null).ReadSelectItemValue(), null); } else if (pa.PropertyType == typeof(long) && pb.PropertyType == typeof(Organisation)) { pb.SetValue(b, pa.GetValue<long>(a).ReadOrganisationId(), null); } else if (pa.PropertyType == typeof(Organisation) && pb.PropertyType == typeof(long)) { pb.SetValue(b, pa.GetValue<Organisation>(a).Id, null); } } return b; }

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• jquery $.getJSON only works once in internet explorer Help Please!!!

  - by JasperS

  I have a php function which inserts a searchbar into each page on a website. The site checks to see if the user has javascript enabled and if they do it inserts some jquery ajax stuff to link select boxes (instead of using it's fallback onchange="form.submit()"). $.getJSON works perfectly for me in other browsers except in IE, if I do a full page refresh (ctrl+F5) in IE my ajax works flawlessly until I navigate to a new page (or the same page with $PHP_SELF) either by submiting the form or clicking a link the jquery onchange function fires but then jquery throws an error: Webpage error details Message: Object doesn't support this property or method Line: 123 Char: 183 Code: 0 URI: http://~#UNABLE~TO~DISCLOSE#~/jquery-1.4.2.min.js It seems like jquery function $.getJSON() is gone??? This seems to be some kind of caching issue as it happens on the second page load but I think i've go all the caching prevention in place anyways, here's a snipet of the code that ads the jquery functions: if (isset($_SESSION['NO_SCRIPT']) == true && $_SESSION['NO_SCRIPT'] == false) { $html .= '<script type="text/javascript" charset="utf-8">'; $html .= '$.ajaxSetup({ cache: false });'; $html .= '$.ajaxSetup({"error":function(XMLHttpRequest,textStatus, errorThrown) { alert(textStatus); alert(errorThrown); alert(XMLHttpRequest.responseText); }});'; $html .= '</script>'; $html .= '<script type="text/javascript" charset="utf-8">'; $html .= '$(function(){ $("select#searchtype").change(function() { '; $html .= 'alert("change fired!"); '; $html .= '$.getJSON("ajaxgetcategories.php", {id: $(this).val()}, function(j) { '; $html .= 'alert("ajax returned!"); '; $html .= 'var options = \'\'; '; $html .= 'options += \'<option value="0" >--\' + j[0].all + \'--</option>\'; '; $html .= 'for (var i = 0; i < j.length; i++) { options += \'<option value="\' + j[i].id + \'">\' + j[i].name + \'</option>\'; } '; $html .= '$("select#searchcategory").html(options); }) }) }) '; $html .= '</script> '; $html .= '<script type="text/javascript" charset="utf-8"> '; $html .= '$(function(){ $("select#searchregion").change(function() { '; $html .= 'alert("change fired!"); '; $html .= '$.getJSON("ajaxgetcountries.php", {id: $(this).val()}, function(j) { '; $html .= 'alert("ajax returned!"); '; $html .= 'var options = \'\'; '; $html .= 'options += \'<option value="0" >--\' + j[0].all + \'--</option>\'; '; $html .= 'for (var i = 0; i < j.length; i++) { options += \'<option value="\' + j[i].id + \'">\' + j[i].name + \'</option>\'; } '; $html .= '$("select#searchcountry").html(options); }) }) }) '; $html .= '</script> '; }; return $html; remember, this is part of a php funtion that inserts a script into the html and sorry if it looks a bit messy, I'm new to PHP and Javascript and I'm a bit untidy too :) Please also remember that this works perfectly in IE on the first visit but after any navigation I get the error. Thanks guys

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• Taking screenshots in Windows Vista, Windows 7, with transparent areas outside the app region

  - by Steve Sheldon

  Hey Folks, I am trying to take a screenshot of an application and I would like to make the parts of the rectangle that are not part of the applications region be transparent. So for instance on a standard windows application I would like to make the rounded corners transparent. I wrote a quick test application which works on on XP (or vista/windows 7 with aero turned off): protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); Graphics g = e.Graphics; // Just find a window to test with IntPtr hwnd = FindWindowByCaption(IntPtr.Zero, "Calculator"); WINDOWINFO info = new WINDOWINFO(); info.cbSize = (uint)Marshal.SizeOf(info); GetWindowInfo(hwnd, ref info); Rectangle r = Rectangle.FromLTRB(info.rcWindow.Left, info.rcWindow.Top, info.rcWindow.Right, info.rcWindow.Bottom); IntPtr hrgn = CreateRectRgn(info.rcWindow.Left, info.rcWindow.Top, info.rcWindow.Right, info.rcWindow.Bottom); GetWindowRgn(hwnd, hrgn); // fill a rectangle which would be where I would probably // write some mask color g.FillRectangle(Brushes.Red, r); // fill the region over the top, all I am trying to do here // is show the contrast between the applications region and // the rectangle that the region would be placed in Region region = Region.FromHrgn(hrgn); region.Translate(info.rcWindow.Left, info.rcWindow.Top); g.FillRegion(Brushes.Blue, region); } Quick side note: before commenting that this code is doing stuff it shouldn't (or should do, like dispose) in a paint function, I know, it's not going anywhere but this post and is designed purely as a way to quickly show the problem, and that it does... OK, back to the problem ;) When I run this test app on XP (or Vista/Windows 7 with Aero off), I get something like this, which is great because I can eek an xor mask out of this that can be used later with BitBlt. Here is the problem, on Vista or Windows 7 with Aero enabled, there isn't necessarily a region on the window, in fact in most cases there isn't. Can anybody help me figure out how to get the region of the application like this on these platforms. Here are some of the approaches I have already tried... 1. Using the PrintWindow function: This doesn't work because it gives back a screenshot taken of the window with Aero off and this window is a different shape from the window returned with Aero on 2 Using the Desktop Window Manager API to get a full size thumbnail: This didn't work because it draws directly to the screen and from what I can tell you can't get a screenshot directly out of this api. Yeah, I could open a window with a pink background, show the thumbnail, take a screenshot then hide this temporary window but thats a horrible user experience and a complete hack I would rather not have my name on. 3. Using Graphics.CopyFromScreen or some other pinvoke variant of this: This doesn't work because I can't assume that the window I need information from is at the top of the z-order on the screen. Right now, the best solution I can think of is to special case Aero on Windows 7 and Vista to manually rub out the corners by hard coding some graphics paths I paint out but this solution would suck since any application that performs custom skinning will break this. Can you think of another or better solution? If you are here, thanks for taking time to read this post, I appreciate any help or direction that you can offer!

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• Designing interfaces: predict methods needed, discipline yourself and deal with code that comes to m

  - by fireeyedboy

  Was: Design by contract: predict methods needed, discipline yourself and deal with code that comes to mind I like the idea of designing by contract a lot (at least, as far as I understand the principal). I believe it means you define intefaces first before you start implementing actual code, right? However, from my limited experience (3 OOP years now) I usually can't resist the urge to start coding pretty early, for several reasons: because my limited experience has shown me I am unable to predict what methods I will be needing in the interface, so I might as well start coding right away. or because I am simply too impatient to write out the whole interfaces first. or when I do try it, I still wind up implementing bits of code already, because I fear I might forget this or that imporant bit of code, that springs to mind when I am designing the interfaces. As you see, especially with the last two points, this leads to a very disorderly way of doing things. Tasks get mixed up. I should draw a clear line between designing interfaces and actual coding. If you, unlike me, are a good/disciplined planner, as intended above, how do you: ...know the majority of methods you will be needing up front so well? Especially if it's components that implement stuff you are not familiar with yet. ...resist the urge to start coding right away? ...deal with code that comes to mind when you are designing the interfaces? UPDATE: Thank you for the answers so far. Valuable insights! And... I stand corrected; it seems I misinterpreted the idea of Design By Contract. For clarity, what I actually meant was: "coming up with interface methods before implementing the actual components". An additional thing that came up in my mind is related to point 1): b) How do you know the majority of components you will be needing. How do you flesh out these things before you start actually coding? For arguments sake, let's say I'm a novice with the MVC pattern, and I wanted to implement such a component/architecture. A naive approach would be to think of: a front controller some abstract action controller some abstract view ... and be done with it, so to speak. But, being more familiar with the MVC pattern, I know now that it makes sense to also have: a request object a router a dispatcher a response object view helpers etc.. etc.. If you map this idea to some completely new component you want to develop, with which you have no experience yet; how do you come up with these sort of additional components without actually coding the thing, and stuble upon the ideas that way? How would you know up front how fine grained some components should be? Is this a matter of disciplining yourself to think it out thoroughly? Or is it a matter of being good at thinking in abstractions?

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• Why would autoconf/automake project link against installed library instead of local development libr

  - by Beau Simensen

  I'm creating a library libgdata that has some tests and non-installed programs. I am running into the problem that once I've installed the library once, the programs seem to be linking to the installed version and not the local version in ../src/libgdata.la any longer. What could cause this? Am I doing something horribly wrong? Here is what my test/Makefile.am looks like: INCLUDES = -I$(top_srcdir)/src/ -I$(top_srcdir)/test/ # libapiutil contains all of our dependencies! AM_CXXFLAGS = $(APIUTIL_CFLAGS) AM_LDFLAGS = $(APIUTIL_LIBS) LDADD = $(top_builddir)/src/libgdata.la noinst_PROGRAMS = gdatacalendar gdatayoutube gdatacalendar_SOURCES = gdatacalendar.cc gdatayoutube_SOURCES = gdatayoutube.cc TESTS = check_bare check_PROGRAMS = $(TESTS) check_bare_SOURCES = check_bare.cc (libapiutil is another library that has some helper stuff for dealing with libcurl and libxml++) So, for instance, if I run the tests without having installed anything, everything works fine. I can make changes locally and they are picked up by these programs right away. If I install the package, these programs will compile (it seems like it does actually look locally for the headers), but once I run the program it complains about missing symbols. As far as I can tell, it is linking against the newly built library (../src/libgdata.la) based on the make output, so I'm not sure why this would be happening. If i remove the installed files, the local changes to src/* are picked up just fine. I've included the make output for gdatacalendar below. g++ -DHAVE_CONFIG_H -I. -I.. -I../src/ -I../test/ -I/home/altern8/workspaces/4355/dev-install/include -I/usr/include/libxml++-2.6 -I/usr/lib/libxml++-2.6/include -I/usr/include/libxml2 -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -g -O2 -MT gdatacalendar.o -MD -MP -MF .deps/gdatacalendar.Tpo -c -o gdatacalendar.o gdatacalendar.cc mv -f .deps/gdatacalendar.Tpo .deps/gdatacalendar.Po /bin/bash ../libtool --tag=CXX --mode=link g++ -I/home/altern8/workspaces/4355/dev-install/include -I/usr/include/libxml++-2.6 -I/usr/lib/libxml++-2.6/include -I/usr/include/libxml2 -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -g -O2 -L/home/altern8/workspaces/4355/dev-install/lib -lapiutil -lcurl -lgssapi_krb5 -lxml++-2.6 -lxml2 -lglibmm-2.4 -lgobject-2.0 -lsigc-2.0 -lglib-2.0 -o gdatacalendar gdatacalendar.o ../src/libgdata.la mkdir .libs g++ -I/home/altern8/workspaces/4355/dev-install/include -I/usr/include/libxml++-2.6 -I/usr/lib/libxml++-2.6/include -I/usr/include/libxml2 -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -g -O2 -o .libs/gdatacalendar gdatacalendar.o -L/home/altern8/workspaces/4355/dev-install/lib /home/altern8/workspaces/4355/dev-install/lib/libapiutil.so /usr/lib/libcurl.so -lgssapi_krb5 /usr/lib/libxml++-2.6.so /usr/lib/libxml2.so /usr/lib/libglibmm-2.4.so /usr/lib/libgobject-2.0.so /usr/lib/libsigc-2.0.so /usr/lib/libglib-2.0.so ../src/.libs/libgdata.so -Wl,--rpath -Wl,/home/altern8/workspaces/4355/dev-install/lib creating gdatacalendar Help. :) UPDATE I get the following messages when I try to run the calendar program when I've added the addCommonRequestHeader() method to the Service class after I had installed the library without the addCommonRequestHeader() method. /home/altern8/workspaces/4355/libgdata/test/.libs/lt-gdatacalendar: symbol lookup error: /home/altern8/workspaces/4355/libgdata/test/.libs/lt-gdatacalendar: undefined symbol: _ZN55gdata7service7Service22addCommonRequestHeaderERKSsS4_ Eugene's suggestion to try setting the $LD_LIBRARY_PATH variable did not help. UPDATE 2 I did two tests. First, I did this after blowing away my dev-install directory (--prefix) and in that case, it creates test/.libs/lt-gdatacalendar. Once I have installed the library, though, it creates test/.libs/gdatacalendar instead. The output of ldd is the same for both with one exception: # before install # ldd test/.libs/lt-gdatacalendar libgdata.so.0 => /home/altern8/workspaces/4355/libgdata/src/.libs/libgdata.so.0 (0xb7c32000) # after install # ldd test/.libs/gdatacalendar libgdata.so.0 => /home/altern8/workspaces/4355/dev-install/lib/libgdata.so.0 (0xb7c87000) What would cause this to create lt-gdatacalendar in one case but gdatacalendar in another? The output of ldd on libgdata is: altern8@goldfrapp:~/workspaces/4355/libgdata$ ldd /home/altern8/workspaces/4355/libgdata/src/.libs/libgdata.so.0 linux-gate.so.1 => (0xb7f7c000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7f3b000) libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7dec000) /lib/ld-linux.so.2 (0xb7f7d000)

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• Google App Engine - Secure Cookies

  - by tponthieux

  I'd been searching for a way to do cookie based authentication/sessions in Google App Engine because I don't like the idea of memcache based sessions, and I also don't like the idea of forcing users to create google accounts just to use a website. I stumbled across someone's posting that mentioned some signed cookie functions from the Tornado framework and it looks like what I need. What I have in mind is storing a user's id in a tamper proof cookie, and maybe using a decorator for the request handlers to test the authentication status of the user, and as a side benefit the user id will be available to the request handler for datastore work and such. The concept would be similar to forms authentication in ASP.NET. This code comes from the web.py module of the Tornado framework. According to the docstrings, it "Signs and timestamps a cookie so it cannot be forged" and "Returns the given signed cookie if it validates, or None." I've tried to use it in an App Engine Project, but I don't understand the nuances of trying to get these methods to work in the context of the request handler. Can someone show me the right way to do this without losing the functionality that the FriendFeed developers put into it? The set_secure_cookie, and get_secure_cookie portions are the most important, but it would be nice to be able to use the other methods as well. #!/usr/bin/env python import Cookie import base64 import time import hashlib import hmac import datetime import re import calendar import email.utils import logging def _utf8(s): if isinstance(s, unicode): return s.encode("utf-8") assert isinstance(s, str) return s def _unicode(s): if isinstance(s, str): try: return s.decode("utf-8") except UnicodeDecodeError: raise HTTPError(400, "Non-utf8 argument") assert isinstance(s, unicode) return s def _time_independent_equals(a, b): if len(a) != len(b): return False result = 0 for x, y in zip(a, b): result |= ord(x) ^ ord(y) return result == 0 def cookies(self): """A dictionary of Cookie.Morsel objects.""" if not hasattr(self,"_cookies"): self._cookies = Cookie.BaseCookie() if "Cookie" in self.request.headers: try: self._cookies.load(self.request.headers["Cookie"]) except: self.clear_all_cookies() return self._cookies def _cookie_signature(self,*parts): self.require_setting("cookie_secret","secure cookies") hash = hmac.new(self.application.settings["cookie_secret"], digestmod=hashlib.sha1) for part in parts:hash.update(part) return hash.hexdigest() def get_cookie(self,name,default=None): """Gets the value of the cookie with the given name,else default.""" if name in self.cookies: return self.cookies[name].value return default def set_cookie(self,name,value,domain=None,expires=None,path="/", expires_days=None): """Sets the given cookie name/value with the given options.""" name = _utf8(name) value = _utf8(value) if re.search(r"[\x00-\x20]",name + value): # Don't let us accidentally inject bad stuff raise ValueError("Invalid cookie %r:%r" % (name,value)) if not hasattr(self,"_new_cookies"): self._new_cookies = [] new_cookie = Cookie.BaseCookie() self._new_cookies.append(new_cookie) new_cookie[name] = value if domain: new_cookie[name]["domain"] = domain if expires_days is not None and not expires: expires = datetime.datetime.utcnow() + datetime.timedelta( days=expires_days) if expires: timestamp = calendar.timegm(expires.utctimetuple()) new_cookie[name]["expires"] = email.utils.formatdate( timestamp,localtime=False,usegmt=True) if path: new_cookie[name]["path"] = path def clear_cookie(self,name,path="/",domain=None): """Deletes the cookie with the given name.""" expires = datetime.datetime.utcnow() - datetime.timedelta(days=365) self.set_cookie(name,value="",path=path,expires=expires, domain=domain) def clear_all_cookies(self): """Deletes all the cookies the user sent with this request.""" for name in self.cookies.iterkeys(): self.clear_cookie(name) def set_secure_cookie(self,name,value,expires_days=30,**kwargs): """Signs and timestamps a cookie so it cannot be forged""" timestamp = str(int(time.time())) value = base64.b64encode(value) signature = self._cookie_signature(name,value,timestamp) value = "|".join([value,timestamp,signature]) self.set_cookie(name,value,expires_days=expires_days,**kwargs) def get_secure_cookie(self,name,include_name=True,value=None): """Returns the given signed cookie if it validates,or None""" if value is None:value = self.get_cookie(name) if not value:return None parts = value.split("|") if len(parts) != 3:return None if include_name: signature = self._cookie_signature(name,parts[0],parts[1]) else: signature = self._cookie_signature(parts[0],parts[1]) if not _time_independent_equals(parts[2],signature): logging.warning("Invalid cookie signature %r",value) return None timestamp = int(parts[1]) if timestamp < time.time() - 31 * 86400: logging.warning("Expired cookie %r",value) return None try: return base64.b64decode(parts[0]) except: return None uid=1234|1234567890|d32b9e9c67274fa062e2599fd659cc14 Parts: 1. uid is the name of the key 2. 1234 is your value in clear 3. 1234567890 is the timestamp 4. d32b9e9c67274fa062e2599fd659cc14 is the signature made from the value and the timestamp

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• What precautions should you take when a senior employee leaves?

  - by Mahin

  EDIT : I agree one should check the reasons, why a senior level employee is leaving. But I am interested in knowing the official/management/technical/legal steps one should take after its decided that he is leaving, so that the life after him is smooth. What are the steps management should take when a senior programmer/team lead leaves your company. Some of them which I have thought about are : 1) If He used to manage hosting and domains stuff, change passwords of domain control panels and hosting panels. 2) If your published web sites have maintenance account and he is aware of credentials of that account then change this details also. 3) Suspend mail account for some time and forward all eMails of that account to some ex-employee account. After some time close that account. What are the other things one should check. I am expecting the answer to be a general check list one should follow. It should include both technical scenarios and management scenarios. Notable Suggestions so far : Effectively transfer the responsibilities of that employee to another one without causing any potential delay in your work. Protect your source code. If possible Make them to sign something to say that they don't have copies of source code.. You can also consider NDA here. Use the Notice Period to train his replacement. Now any new code to the project will be done by replacement with the help of Guy who is leaving. Ask him to create a document of things he thinks you should know. Make sure he checks everything in now and then any checkout will only be done by the replacement. Emails, copy off his email account to a pst.file (this assumes Outlook), Make this file available to his replacement. the employee should probably be given a chance to scrub the email. if you are going to keep his account open for whatever reason, check that no rules are created that forward incoming emails to an alternate address. Copy the hard drive of his computer to a network location and have someone senior go through and see if there are any files (drafts of performance reviews or other sensitive issues ) on it that someone else might need. Clearance from Accounts,Finance,Security,Library etc departments.Obtain all company property, laptops, keys, etc. If there is no reason not to, you should reward a departing person for their many years of service. Write them letters of recommendation (even if they already have a new job lined up).Say goodbye, and keep the door open. Make sure any outside clients know that the departing employee is not their main contact anymore. Never neglect the exit interview/debriefing. Confirm the last day of employment so that there is no misunderstanding Inform H/R if the employee is on H1B status, there is paperwork required to notify the government when an H1B employee leaves. Depending on how senior / what position, you might spend some time convincing him not to take the rest of the engineering staff with him. Make sure he spends his last days on a good note, because if he is not leaving on a good note, he can easily pollute the mind of his colleagues. Best Regards, Mahin Gupta EDIT : Now offered a bounty on it to get more detailed responses and practical suggestions.

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• Oracle data warehouse design - fact table acting as a dimension?

  - by Elizabeth

  THANKS: Both answers here are very helpful, but I could only pick one. I really appreciate the advice! our datawarehouse will be used more for workflow reports than traditional analytical reports. Our users care about "current picture" far more than history. (though history matters, too.) We are a government entity that does not have costs or related calculations. Mostly just counts of people within given locations and with related history. We are using Oracle, and I have found distinct advantage in using the star join whenever possible and would like to rearchitect everything to as closely resemble the star schema as is reasonable for our business uses. Speed in this DW is vital, and a number of tests have already proven the star schema approach to me. Our "person" table is key - it contains over 4 million records and will be the most frequently used source in queries. It can be seen at the center of a star with multiple dimensions (like age, gender, affiliation, location, etc.). It is a very LONG table, particularly when I join it to the address and contact information. However, it is more like a dimension table when we start looking at history. For example, there are two different history tables that have a person key pointing to the person table. One has over 20 million records and the other has almost 50 million and grows daily. Is this table a fact table or a dimension table? Can one work as both? If so, is that going to be a big performance problem? Is it common to query more off of a dimension than a fact? What happens if a DIFFERENT fact table that uses the person table as a dimension is actually only 60,000 records (much smaller.). I think my problem is that our data and use of it does not fit with the commonly use examples of star schemas. CLARIFICATION: Some good thoughts have been added below, but perhaps I left too much out to really explain well. Here's some more info: We handle a voter database. We don't have any measures except voter counts by various groups: voter counts by party, by age, by location; voter counts by ballot type and election, by ballot status and election, etc. We do have a "voting history" log as well as an activity audit log (change of address, party, etc.). We have information on which voters are election workers and all that related information. I figure I'll get to the peripheral stuff later. For now I'm focusing on our two major "business processes": voter registration(which IS a voter.) and election turnout. In the first, voter is a fact. In the second, voter is a dimension, along with party, election, and type of ballot. (and in case anyone is worried - no we don't know HOW people vote. Just that they do. LOL ) I hope that clarifies things a bit.

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• Most simple way to do holiday calculation?

  - by brainfrog

  I want to make a little free calendar program to help me and others calculate how much time we have got left in a project. I mean real working time, not just time. Time in a raw form is not saying much. Typically when my boss tells me that I have time until 05-05-2011 it doesn't tell me really how much time I have to do my job. You know...so many things stop me from work: A) beeing at home, not at work (so called "free time" or "spare time"). That is in my case I work exactly 8 hours a day and then the cleaning ladies throw me out of the office with their incredible loud industrial vacuum cleaners every evening (my boss accepts that as an excuse to go home in time, regularly). B) weekends, or more precisely saturdays and sundays C) official holiday rescuing me from having to go to work. what I want to do is make a little utility which tells me how many working hours I really have in a given time period. The first two things A and B are pretty easy to implement. But the last thing C scares my pants off. Holidays. OOOHHH man. You know what that means. Chaos. Pure chaos. The huge question is: HOW TO CALCULATE HOLIDAYS?! Since I want my program to be useful for anyone anywhere in the world, I can't just hardcode all holidays for my little town. So which options do I have? I) I could hand-craft downloadable lists of holidays. Users search them within the application and download them from an webserver. Or I ship all of them in the package. But I would get very, very old if I tried that by myself for every country, state and town. II) I make an initial data sheet with holidays for my town, and don't care about the rest. However, I make that sheet with an how-to public, so that everyone who feels like beeing very nice can provide holiday data for his country / region / whatever. Those are made public on a webserver and everyone can get the data packages he/she needs for the app. III) ? I care a lot about usability. I don't want to make an ugly linux hack style hard to use app that only computer freaks can use. So you need to tell me more about holiday science. I was never really clever at this. I assume every single country in the world has it's own set of holidays. In every country there may be several states. For example the US has some, and Germany has also some states. Holidays vary from state to state. But I know from an good programmer he told me never assume anything. So the questions about holiday science are: Which categories do I need to make holiday-data-packs searchable? A guy from India should find quickly his holiday data pack, and a guy from Sillicon Valley should find his pack as equally fast. It makes most sense to me to filter for COUNTRY STATE WHATEVER. Like a drill-down-search. Did I miss something? What would be the best data format to hold holiday information? A holiday has a start and end date and a name. That should be enough. Would I put all this stuff in thousands of XML files? How would you go about this? Any hint / help is highly welcome! Thanks to everyone!

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• CommandBinding broken in inner Custom Control when nesting two Custom Controls of the same type.

  - by Fredrik Eriksson

  I've done a Custom Control in form of a GroupBox but with an extra header which purpose is to hold a button or a stackpanel with buttons at the other side. I've added the a Dependency Property to hold the extra header and I've connected the customized template. Everything works fine until I put one of these controls in another one. Now the wierd stuff begins(at least in my eyes xP), the command binding in the inner control simply isn't set. I tried to use Snoop to gather some data, the see if the inherits is broken and when I clicked on the buttons which isn't doing what I want it to, boom, breakpoint triggered. So in some wierd way the Command isn't set until something that I don't know what it is, happens, which snoops triggers. I've also tried to put the buttons in the regular Header property and that works fine, but not with my own made. I could just switch places with them to make it like I want but now I'm curious to know where the problem lies... Now I wonder, what can I've missed? The control class: public class TwoHeaderedGroupBox : GroupBox { static TwoHeaderedGroupBox() { DefaultStyleKeyProperty.OverrideMetadata(typeof(TwoHeaderedGroupBox), new FrameworkPropertyMetadata(typeof(TwoHeaderedGroupBox))); } public static DependencyProperty HeaderTwoProperty = DependencyProperty.Register("HeaderTwo", typeof(object), typeof(TwoHeaderedGroupBox), new FrameworkPropertyMetadata()); public object HeaderTwo { get { return (object)GetValue(HeaderTwoProperty); } set { SetValue(HeaderTwoProperty, value);} } } And here is the Template (which by the way is created by blend from the beginning): <ControlTemplate TargetType="{x:Type Controls:TwoHeaderedGroupBox}"> <Grid SnapsToDevicePixels="true"> <Grid.ColumnDefinitions> <ColumnDefinition Width="6"/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> <ColumnDefinition Width="6"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"/> <RowDefinition Height="Auto"/> <RowDefinition Height="*"/> <RowDefinition Height="6"/> </Grid.RowDefinitions> <Border BorderBrush="Transparent" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="4" Grid.Column="0" CornerRadius="4" Grid.Row="1" Grid.RowSpan="3"/> <Border x:Name="Header" Grid.Column="1" Padding="3,1,3,0" Grid.Row="0" Grid.RowSpan="2" VerticalAlignment="Center"> <ContentControl Content="{TemplateBinding Header}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> </Border> <ContentPresenter Grid.ColumnSpan="2" Grid.Column="1" Margin="{TemplateBinding Padding}" Grid.Row="2" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/> <Border BorderBrush="White" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="4" CornerRadius="4" Grid.Row="1" Grid.RowSpan="3"> <Border.OpacityMask> <MultiBinding ConverterParameter="7" Converter="{StaticResource BorderGapMaskConverter}"> <Binding ElementName="Header" Path="ActualWidth"/> <Binding Path="ActualWidth" RelativeSource="{RelativeSource Self}"/> <Binding Path="ActualHeight" RelativeSource="{RelativeSource Self}"/> </MultiBinding> </Border.OpacityMask> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="3"> <Border BorderBrush="White" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="2"/> </Border> </Border> <Border x:Name="HeaderTwo" Grid.Column="2" Padding="3,5,3,5" Grid.Row="0" Grid.RowSpan="2" HorizontalAlignment="Right"> <ContentControl Content="{TemplateBinding HeaderTwo}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" DataContext="{TemplateBinding DataContext}"/> </Border> </Grid> </ControlTemplate>

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• Problem Implementing StructureMap in VB.Net Conversion of SharpArchitecture

  - by Monkeeman69

  I work in a VB.Net environment and have recently been tasked with creating an MVC enviroment to use as a base to work from. I decided to convert the latest SharpArchitecture release (Q3 2009) into VB, which on the whole has gone fine after a bit of hair pulling. I came across a problem with Castle Windsor where my custom repository interface (lives in the core/domain project) that was reference in the constructor of my test controller was not getting injected with the concrete implementation (from the data project). I hit a brick wall with this so basically decided to switch out Castle Windsor for StructureMap. I think I have implemented this ok as everything compiles and runs and my controller ran ok when referencing a custom repository interface. It appears now that I have/or cannot now setup my generic interfaces up properly (I hope this makes sense so far as I am new to all this). When I use IRepository(Of T) (wanting it to be injected with a concrete implementation of Repository(Of Type)) in the controller constructor I am getting the following runtime error: "StructureMap Exception Code: 202 No Default Instance defined for PluginFamily SharpArch.Core.PersistenceSupport.IRepository`1[[DebtRemedy.Core.Page, DebtRemedy.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]], SharpArch.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=b5f559ae0ac4e006" Here are my code excerpts that I am using (my project is called DebtRemedy). My structuremap registry class Public Class DefaultRegistry Inherits Registry Public Sub New() ''//Generic Repositories AddGenericRepositories() ''//Custom Repositories AddCustomRepositories() ''//Application Services AddApplicationServices() ''//Validator [For](GetType(IValidator)).Use(GetType(Validator)) End Sub Private Sub AddGenericRepositories() ''//ForRequestedType(GetType(IRepository(Of ))).TheDefaultIsConcreteType(GetType(Repository(Of ))) [For](GetType(IEntityDuplicateChecker)).Use(GetType(EntityDuplicateChecker)) [For](GetType(IRepository(Of ))).Use(GetType(Repository(Of ))) [For](GetType(INHibernateRepository(Of ))).Use(GetType(NHibernateRepository(Of ))) [For](GetType(IRepositoryWithTypedId(Of ,))).Use(GetType(RepositoryWithTypedId(Of ,))) [For](GetType(INHibernateRepositoryWithTypedId(Of ,))).Use(GetType(NHibernateRepositoryWithTypedId(Of ,))) End Sub Private Sub AddCustomRepositories() Scan(AddressOf SetupCustomRepositories) End Sub Private Shared Sub SetupCustomRepositories(ByVal y As IAssemblyScanner) y.Assembly("DebtRemedy.Core") y.Assembly("DebtRemedy.Data") y.WithDefaultConventions() End Sub Private Sub AddApplicationServices() Scan(AddressOf SetupApplicationServices) End Sub Private Shared Sub SetupApplicationServices(ByVal y As IAssemblyScanner) y.Assembly("DebtRemedy.ApplicationServices") y.With(New FirstInterfaceConvention) End Sub End Class Public Class FirstInterfaceConvention Implements ITypeScanner Public Sub Process(ByVal type As Type, ByVal graph As PluginGraph) Implements ITypeScanner.Process If Not IsConcrete(type) Then Exit Sub End If ''//only works on concrete types Dim firstinterface = type.GetInterfaces().FirstOrDefault() ''//grabs first interface If firstinterface IsNot Nothing Then graph.AddType(firstinterface, type) Else ''//registers type ''//adds concrete types with no interfaces graph.AddType(type) End If End Sub End Class I have tried both ForRequestedType (which I think is now deprecated) and For. IRepository(Of T) lives in SharpArch.Core.PersistenceSupport. Repository(Of T) lives in SharpArch.Data.NHibernate. My servicelocator class Public Class StructureMapServiceLocator Inherits ServiceLocatorImplBase Private container As IContainer Public Sub New(ByVal container As IContainer) Me.container = container End Sub Protected Overloads Overrides Function DoGetInstance(ByVal serviceType As Type, ByVal key As String) As Object Return If(String.IsNullOrEmpty(key), container.GetInstance(serviceType), container.GetInstance(serviceType, key)) End Function Protected Overloads Overrides Function DoGetAllInstances(ByVal serviceType As Type) As IEnumerable(Of Object) Dim objList As New List(Of Object) For Each obj As Object In container.GetAllInstances(serviceType) objList.Add(obj) Next Return objList End Function End Class My controllerfactory class Public Class ServiceLocatorControllerFactory Inherits DefaultControllerFactory Protected Overloads Overrides Function GetControllerInstance(ByVal requestContext As RequestContext, ByVal controllerType As Type) As IController If controllerType Is Nothing Then Return Nothing End If Try Return TryCast(ObjectFactory.GetInstance(controllerType), Controller) Catch generatedExceptionName As StructureMapException System.Diagnostics.Debug.WriteLine(ObjectFactory.WhatDoIHave()) Throw End Try End Function End Class The initialise stuff in my gloabal.asax Dim container As IContainer = New Container(New DefaultRegistry) ControllerBuilder.Current.SetControllerFactory(New ServiceLocatorControllerFactory()) ServiceLocator.SetLocatorProvider(Function() New StructureMapServiceLocator(container)) My test controller Public Class DataCaptureController Inherits BaseController Private ReadOnly clientRepository As IClientRepository() Private ReadOnly pageRepository As IRepository(Of Page) Public Sub New(ByVal clientRepository As IClientRepository(), ByVal pageRepository As IRepository(Of Page)) Check.Require(clientRepository IsNot Nothing, "clientRepository may not be null") Check.Require(pageRepository IsNot Nothing, "pageRepository may not be null") Me.clientRepository = clientRepository Me.pageRepository = pageRepository End Sub Function Index() As ActionResult Return View() End Function The above works fine when I take out everything to do with the pageRepository which is IRepository(Of T). Any help with this would be greatly appreciated.

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• hibernate fail mapping two tables

  - by sebbalex

  Hi guys, I'd like to understand how it is possible: Until I was working with one table everything worked fine, when I have mapped another table it fails as shown below: Glassfish start: INFO: configuring from resource: /hibernate.cfg.xml INFO: Configuration resource: /hibernate.cfg.xml INFO: Reading mappings from resource : hibernate_centrale.hbm.xml //first table INFO: Mapping class: com.italtel.patchfinder.objects.centrale - centrale INFO: Reading mappings from resource : hibernate_impianti.hbm.xml //second table INFO: Mapping class: com.italtel.patchfinder.objects.Impianto - impianti INFO: Configured SessionFactory: null INFO: schema update complete INFO: Hibernate: select centrale0_.id as id0_, centrale0_.name as name0_, centrale0_.impianto as impianto0_, centrale0_.servizio as servizio0_ from centrale centrale0_ group by centrale0_.name INFO: Hibernate: select centrale0_.id as id0_, centrale0_.name as name0_, centrale0_.impianto as impianto0_, centrale0_.servizio as servizio0_ from centrale centrale0_ where centrale0_.name='ANCONA' order by centrale0_.name asc //Error org.hibernate.hql.ast.QuerySyntaxException: impianti is not mapped [from impianti where impianto='SD' order by modulo asc] at org.hibernate.hql.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:181) ..... config: table1 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="com.italtel.patchfinder.objects.Impianto" table="impianti"> <id column="id" name="id"> <generator class="increment"/> </id> <property name="impianto"/> <property name="modulo"/> </class> </hibernate-mapping> table2 <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="com.italtel.patchfinder.objects.centrale" table="centrale"> <id column="id" name="id"> <generator class="increment"/> </id> <property name="name"/> <property name="impianto"/> <property name="servizio"/> </class> </hibernate-mapping> connection stuff ... <property name="hbm2ddl.auto">update</property> <mapping resource="hibernate_centrale.hbm.xml"/> <mapping resource="hibernate_impianti.hbm.xml"/> </session-factory> </hibernate-configuration> Class: public List loadAll() { Session session = sessionFactory.getCurrentSession(); session.beginTransaction(); return session.createQuery("from centrale group by name").list(); } public List<centrale> loadImplants(String centrale) { Session session = sessionFactory.getCurrentSession(); session.beginTransaction(); return session.createQuery("from centrale where name='" + centrale + "' order by name asc").list(); } public List<Impianto> loadModules(String implant) { Session session = sessionFactory.getCurrentSession(); session.beginTransaction(); return session.createQuery("from impianti where impianto='" + implant + "' order by modulo asc").list(); } } Do you have some advice? Thanks in advance

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• SVN: Release branch headaches, how to merge in website revisions as and when cleared to go live?

  - by Pete Duncanson

  I need a sanity check here if we can, any ideas on correcting/changing the following are very welcome! We've been getting ourselves in knots of late with our SVN and are trying to correct it by putting a Trunk/Release system in place. We have a large website that we develop on and we store it all in SVN. Heres what we had in mind: We have trunk and a release branch All work gets checked into Trunk. When a feature is deemed ready for the next release it is merged into a Release branch. We only have one release branch and just tag "Latest" when we do a push to live We hope to be able to get all the files changed from Latest to Head to give us a zip that we can upload (any ideas on an easy way to do this via scripting?) So we set all this up and where very happy with ourselves. Except its not working and heres why. We work on lots a different features/fixes/problems at once and they don't all get nicely checked in feature complete (but always working at least). Then sometimes you have to wait for Clients to sign off. As a result you end up with revisions which are "ready for live" being scattered with ones which are "still being worked on" in trunk. That means that the completed revisions are not getting merged in sequentially but out of order. I thought SVN could handle this, clever little thing it is, but apparently not. Heres an example: Pete changes some CSS to make a new button look pretty (Revision 1) Dave add some CSS to the bottom of the same CSS file as Pete's for a new feature (Revision 2) Dave's mod gets the nod so he merges it into Release and commits it with a log message mentioning revision number and bug tracking id. Pete adds more buttons to finish this mod, no CSS changes here though (Revision 3) Pete then merges his mods (Revision 1 and 3) into the Head of Release (which has Daves merge in it) but this over-writes Daves CSS additions which now dissapear completely. This leads to the site being broken and the Release branch being pretty much useless. So we tried some other ideas like reverting Release back to "Latest" and then just merging in all the Revisions 1,2 and 3 in order. This worked fine until we had Revision 4 which was not ready for live and Revision 5 which was. Suddenly we are getting ourselves in knots again with exactly the same problem! Ok so take three. Revert to Latest, merge in Revision 5, then do any update back to Head. Tree conflicts galore! So thats a no no. I cracked in the end and built it all up manaually but its not something I want to do regular, ideally I want to script our deployment but can't while Release is in such a mess. HELP! What the heck are we doing wrong? I can't seem to find any solutions to this problem of wanting different none sequential Revisions in Release. If its not possible thats fine but how the heck are we meant to get stuff live easily. We can't branch for every single change, the site takes 30 minutes+ to check out it would take too long. Side note, we are using TortoiseSVN so can we keep command line examples to a minimum in any answers? Latest version of TSVN and SVN Version 1.6 so we have the funky merge tracking etc. EDIT: An excellent blog post which deals with the dev/release cycle (although using GIT but still relivant) thought everyone would like to read it if they found this question interesting. (http://nvie.com/git-model) EDIT 2: I wrote a blog post on how to show which branch you are working on in your website which others have asked me about (http://www.offroadcode.com/2010/5/14/which-svn-branch-are-you-working-on.aspx). Hope that helps. In the meantime we are looking at Kiln and hoping to make the switch next month (gulp!)

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• jQuery dialog box, php form.

  - by tony noriega

  i have a dialog box that opens on pageload for a site. script type="text/javascript"> $(function() { $('#dialog-message').dialog({ modal: 'true', width: '400' }); }); </script> this pulls up an include: <div id="dialog-message" title="Free Jiu Jitsu Session at Alliance"> <!--#include virtual="/includes/guest.php" --> guest.php has a very small form that is processed by the page itself: <?php $dbh=mysql_connect //login stuff here if (isset($_POST['submit'])) { if (!$_POST['name'] | !$_POST['email']) { echo"<div class='error'>Error<br />Please provide your Name and Email Address so we may properly contact you.</div>"; } else { $age = $_POST['age']; $name = $_POST['name']; $gender = $_POST['gender']; $email = $_POST['email']; $phone = $_POST['phone']; $comments = $_POST['comments']; $query = "INSERT INTO table here (age,name,gender,email,phone,comments) VALUES ('$age','$name','$gender','$email','$phone','$comments')"; mysql_query($query); mysql_close(); $yoursite = "my site here"; $youremail = $email; $subject = "Website Guest Contact Us Form"; $message = "message here"; $email2 = "send to email address"; mail($email2, $subject, $message, "From: $email"); echo"<div class='thankyou'>Thank you for contacting us,<br /> we will respond as soon as we can.</div>"; } } ?> <form id="contact_us" class="guest" method="post" action="/guest.php" > <fieldset> <legend>Personal Info</legend> <label for="name" class="guest">Name:</label> <input type="text" name="name" id="name" value="" /><br> <label for="phone" class="guest">Phone:</label> <input type="text" name="phone" id="phone" value="" /><br> <label for="email" class="guest">Email Address:</label> <input type="text" name="email" id="email" value="" /><br> <label for="age" class="guest">Age:</label> <input type="text" name="age" id="age" value="" size="2" /><br> <label for="gender" class="guest">Sex:</label> <input type="radio" name="gender" value="male" /> Male <input type="radio" name="gender" value="female" /> Female<br /> </fieldset> <fieldset> <legend>Comments</legend> <label for="comments" class="guest">Comments / Questions:</label> <textarea id="comments" name="comments" rows="4" cols="22"></textarea><br> <input type="submit" value="Submit" name="submit" /> <input type="Reset" value="Reset" /> </fieldset> </form> Problem is, that the path of the form action does not work, becasue this dialog box is on the index.html page of the site, and if i put the absolute path, it doesnt process... i have this functioning on another contact us page, so i know it works, but wit the dialog box, it seems to have stumped me... what should i do?

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• DirectX: Render to a screen buffer without using a render target

  - by knight666

  Hello, I'm writing an open source 2D game engine, and I want to support as many devices and platforms as possible. I currently only have Windows Mobile though. I'm rendering using DirectX Mobile, with DirectDraw as a fallback path. However, I've run into a bit of trouble. It seems that while the reference driver supports createRenderTarget, many many many physical devices do not. I need some way to render to the screen without using a render target, because I render sprites using textured quads, but I also need to be able to draw individual pixels. This is how I do it right now: // save old values if (Error::Failed(m_D3DDevice->GetRenderTarget(&m_D3DOldTarget))) { ERROR_EXPLAIN("Could not retrieve backbuffer."); return false; } // clear render surface if (Error::Failed(m_D3DDevice->SetRenderTarget(m_D3DRenderSurface, NULL))) { ERROR_EXPLAIN("Could not set render target to render texture."); return false; } if (Error::Failed (m_D3DDevice->Clear( 0, NULL, // target rectangle D3DMCLEAR_TARGET, D3DMCOLOR_XRGB(0, 0, 0), // clear color 1.0f, 0 ) ) ) { ERROR_EXPLAIN("Failed to clear render texture."); return false; } D3DMLOCKED_RECT render_rect; if (Error::Failed(m_D3DRenderSurface->LockRect(&render_rect, NULL, NULL))) { ERROR_EXPLAIN("Failed to lock render surface pixels."); } else { m_D3DBackSurf->SetBuffer((Pixel*)render_rect.pBits); m_D3DRenderSurface->UnlockRect(); } // begin scene if (Error::Failed(m_D3DDevice->BeginScene())) { ERROR_EXPLAIN("Failed to start rendering."); return false; } // ===================== // example rendering // ===================== // some other stuff, but the most important part of rendering a sprite: device->SetTexture(0, m_Texture)); device->SetStreamSource(0, m_VertexBuffer, sizeof(Vertex)); device->DrawPrimitive(D3DMPT_TRIANGLELIST, 0, 2); // plotting a pixel Surface* target = (Surface*)Device::GetRenderMethod()->GetRenderTarget(); buffer = target->GetBuffer(); buffer[somepixel] = MAKECOLOR(255, 0, 0); // end scene if (Error::Failed(device->EndScene())) { ERROR_EXPLAIN("Failed to end scene."); return false; } // clear screen if (Error::Failed(device->SetRenderTarget(m_D3DOldTarget, NULL))) { ERROR_EXPLAIN("Couldn't set render target to backbuffer."); return false; } if (Error::Failed(device->GetBackBuffer ( 0, D3DMBACKBUFFER_TYPE_MONO, &m_D3DBack ) ) ) { ERROR_EXPLAIN("Couldn't retrieve backbuffer."); return false; } RECT dest = { 0, 0, Device::GetWidth(), Device::GetHeight() }; if (Error::Failed( device->StretchRect ( m_D3DRenderSurface, NULL, m_D3DBack, &dest, D3DMTEXF_NONE ) ) ) { ERROR_EXPLAIN("Failed to stretch render texture to backbuffer."); return false; } if (Error::Failed(device->Present(NULL, NULL, NULL, NULL))) { ERROR_EXPLAIN("Failed to present device."); return false; } I'm looking for a way to do the same thing (render sprites using hardware acceleration and plot pixels on a buffer) without using a render target. Thanks in advance.

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• XSL-FO: Force Wrap on Table Entries

  - by Ace

  I'm having an issue where when I publish my modspecs to pdf (XSL-FO). My tables are having issues, where the content of a cell will overflow its column into the next one. How do I force a break on the text so that a new line is created instead? I can't manually insert zero-space characters since the table entries are programmatically entered. I'm looking for a simple solution that I can just simply add to docbook_pdf.xsl (either as a xsl:param or xsl:attribute) EDIT: Here is where I'm at currently: <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0" xmlns:fo="http://www.w3.org/1999/XSL/Format"> <xsl:import href="urn:docbkx:stylesheet"/> ...(the beginning of my stylesheet for pdf generation, e.g. header and footer content stuff) <xsl:template match="text()"> <xsl:call-template name="intersperse-with-zero-spaces"> <xsl:with-param name="str" select="."/> </xsl:call-template> </xsl:template> <xsl:template name="intersperse-with-zero-spaces"> <xsl:param name="str"/> <xsl:variable name="spacechars"> &#x9;&#xA; &#x2000;&#x2001;&#x2002;&#x2003;&#x2004;&#x2005; &#x2006;&#x2007;&#x2008;&#x2009;&#x200A;&#x200B; </xsl:variable> <xsl:if test="string-length($str) &gt; 0"> <xsl:variable name="c1" select="substring($str, 1, 1)"/> <xsl:variable name="c2" select="substring($str, 2, 1)"/> <xsl:value-of select="$c1"/> <xsl:if test="$c2 != '' and not(contains($spacechars, $c1) or contains($spacechars, $c2))"> <xsl:text>&#x200B;</xsl:text> </xsl:if> <xsl:call-template name="intersperse-with-zero-spaces"> <xsl:with-param name="str" select="substring($str, 2)"/> </xsl:call-template> </xsl:if> </xsl:template> </xsl:stylesheet> With this, the long words are successfully broken up in the table cells! Unfortunately, the side effect is that normal text elsewhere (like in a under sextion X) now breaks up words so that they appear on seperate lines. Is there a way to isolate the above process to just tables? EDIT #2 here is what the fo spits out for a single table... <fo:table-row><fo:table-cell padding-start="2pt" padding-end="2pt" padding-top="2pt" ... </fo:block></fo:table-cell></fo:table-row>

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• Recommended ASP.NET Shared Hosting (USA)

  - by coffeeaddict

  Ok, I have to admit I'm getting fed up with www.discountasp.net's pricing model and this annoyance has built up over the past 8 years or so. I've been with them for years and absolutely love them on the technical side, however it's getting ridiculously expensive for so little that you get. I mean here's my scenario: 1) I am running 2 SQL Server databases which costs me $10/ea per month so that's $20/month for 2 and I only get 500 mb disk space which is horrible 2) I am paying $10/mo just for the hosting itself which I only get 1 gig of disk space! I mean common! 3) I am simply running 2 small apps (Screwturn Wiki & Subtext Blog)...so I don't really care if it's up 99% or not, it's not worth paying a total of $300 just to keep these 2 apps running over discountasp.net Anyone else feel the same? Yes, I know they have great support, probably have great servers running behind this but in the end I really don't care as long as my site is up 95% or better. Yes, the hosting toolset rocks. But you know I bet you I can find a similar set somewhere else. I like how I can totally control IIS 7 at discountasp and I can control my own app pool etc. That's very powerful and essential. But anyone have any good alternatives to discountasp that gives me close to the same at a much more reasonable cost point? I mean http://www.m6.net/prices.aspx gives you 10 SQL Databases for $7 and 200 gigs disk space! I don't know about their tools or support but just looking at those numbers and some other hosts I've seen, I feel that discountasp.net is way out of line. They don't even offer any purchasing discounts such as it would be nice if my 2nd SQL Server is only $5/month not $10...stuff like this, to make it much more realistic and fair. Opinions (people who do have discountasp.net, people who have left them, or people who have another host they like)??? But geez $300 just to host a couple DBs and lightweight open source apps? Not worth the price they are charging. I'm almost at a price point that enables me to get a decent dedicated server! I really don't care about beta ASP.NET frameworks support. Not a big deal to me. If you have alternative suggestions rather than your experience with discountasp, I'd like to know how their toolset is. Do you have complete control over your DB in terms of adding users, and same goes for the web app pool, etc.? Discountasp.net's control panel rocks. I don't want to loose the ability to at least control and add virtual directories, recycle my dedicated app pool myself, backup my sql database myself, through tools which is what discountasp does give you. I'd also want to know that the hoster at least gets the latest and greatest in terms of non-beta ASP.NET related frameworks available to its shared hosters.

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• PHP framework question

  - by iconiK

  I'm currently working on a browser-based MMO and have chosen the LAMP stack because of the extremely low cost to start with in production (versus Windows + IIS + ASP.NET/C# + SQL Server, even though I have MSDN Universal). However I will need a PHP framework for this as it's no easy task. I am not restricted by anything other than the ability to run on Linux, as I will use a dedicated cloud hosting solution (and a VMWare image for development) and can configure it as needed. In no specific order: It has to be easily scalable; this is crucial. If the game becomes a steady success it will eventually outgrow the server beyond what the host provides and would have to be moved to several load-balanced servers. It is crucial that this can be done with minimum effort. I do know this might require following strict conventions, so if you know of any for your suggested framework please explain what would be needed. It has to provide modules for all the core tasks: authentication, ACL, database access, MVC, and so on. One or two missing modules are fine, as long as they can easily be written and integrated. It should support internationalization. I think there is no excuse for any web framework not to provide means of translating the application and switching between languages without a lot of effort from the programmer. Must have very good community support and preferably commercial support as well. Yes, I do know QCodo/QCubed is so nice, but it is not mature enough for this task. Smooth AJAX support is required. Whether the framework comes with AJAX-capable widgets or has an easy way of adding AJAX is not relevant, as long as AJAX is easily doable. I plan to use jQuery + Dojo or one of them alone - not exactly sure. Auto-magically doing stuff when it improves readability and relieves a lot of effort would be especially nice if it is generally reliable and does not interfere with other requirements. This seems to be the case of CakePHP. I have read a lot of comparisons and I know it's a really hot debate. The general answer is "try and see for yourself what suits you". However, I can't say it is easy for this task and I'm calling for your experience with building applications with similar requirements. So far I'm tied up between Zend and CakePHP by the general criteria, however, all well-known frameworks offer the same functionality in some way or another with different approaches each with it's own advantages and disadvantages. Edits: I am kinda new to MVC, however, I am willing to learn it and I don't care if a framework is easier for those new to MVC. I have lots of time to learn MVC and any other architectures (or whatever they're called) you recommend. I will use Zend as a utility "framework", even though it's just a collection of libraries (some good ones though, as I have been told). Current PHP contenders are: CakePHP, Kohana, Zend alone.

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• StaleDataException: access closed cursor

  - by Aurora

  In my application, after enough clicking around, I get this error: 06-08 19:47:59.967: ERROR/AndroidRuntime(2429): java.lang.RuntimeException: Unable to pause activity {com.MYAPP.app/com.MYAPP.app.MainActivity}: android.database.StaleDataException: Access closed cursor What I have is a Tab Activity (my MainActivity), which has a ListActivity as the contents for each tab. Inside the onCreate for each ListActivity I get a cursor that represents the data to be displayed in that list. The onListItemClick for each list also creates another activity, so clicking on an item in the list will show more information about that item in a new screen. It's inconsistent, but after enough clicking into these new activities, or going back to the ListView from a new activity, the program crashes. In searching around for a solution to my problem, I did stumble upon registerDataSetObserver, but it doesn't seem to be the whole answer. I am also having trouble finding documentation on it, so I'm not sure I fully understand it. I have a custom ListAdapter that both my ListViews use and have called registerDataSetObservers on the cursors there. I have attached the relevant code from one of my ListActivities and from my custom ListAdapter class. The ListActivity. I have two of these, almost identical, except they both have different cursors created from different database queries: import com.MYAPP.app.listmanager.DeviceListAdapter; public class AllSensorsActivity extends ListActivity{ private DeviceListAdapter AllList; private DbManager db; protected Cursor AllCur; protected Cursor AllSensors; private static final String TAG = "AllSensorsActivity"; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); Log.e(TAG, "Calling All onCreate"); db = new DbManager(this); db.open(); AllCur = db.fetchAllDevices(); startManagingCursor(AllCur); AllSensors = db.fetchAllSensors(); startManagingCursor(AllSensors); AllList = new DeviceListAdapter(this, AllCur, AllSensors); setListAdapter(AllList); } @Override protected void onListItemClick(ListView l, View v, int position, long id){ String device_name = (String) ((DeviceListAdapter)getListAdapter()).getItem(position); String sensor_string = ((DeviceListAdapter)getListAdapter()).getSensors(id); Intent i = new Intent(this, SensorActivity.class); Bundle bundle = new Bundle(); bundle.putString("NAME", device_name); i.putExtras(bundle); bundle.putString("SENSORS", sensor_string); i.putExtras(bundle); this.startActivity(i); } The custom ListAdapter: public class DeviceListAdapter extends BaseAdapter { private static final String TAG = "DeviceListAdapter"; private Context mContext; private Cursor mSensors; private Cursor mDevices; protected MyDataSetObserver sensors_observer; protected MyDataSetObserver devices_observer; public DeviceListAdapter(Context context, Cursor devices, Cursor sensors){ mContext = context; mDevices = devices; mSensors = sensors; sensors_observer = new MyDataSetObserver(); mSensors.registerDataSetObserver(sensors_observer); devices_observer = new MyDataSetObserver(); mDevices.registerDataSetObserver(devices_observer); } // ... more functions and stuff that are not relevant go down here... } private class MyDataSetObserver extends DataSetObserver { public void onChanged(){ Log.e(TAG, "CHANGED CURSOR!"); } public void onInvalidated(){ Log.e(TAG, "INVALIDATED CURSOR!"); } } Should I just have MyDataSetObserver catch the exception and move on? I'd like a more robust solution than that if possible. Or is there some other way I could rearrange my program so that the staleDataException doesn't occur (as often)? I believe that it is happening because I am launching the new activity in my onListItemClick.

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• Android: preferences not being stored automatically

  - by Vitaly

  I'm trying to use preference screen. I'm following all steps from online tutorial (once I couldn't get it working, I found other tutorials, and steps seem to be fine). I get to preferences screen, edit values, return to calling activity (via hardware return button). In DDMS perspective FileExplorer shows package_name_preferences.xml file with preferences that should be stored. It contains: <?xml version='1.0' encoding='utf-8' standalone='yes' ?> <map> <string name="false">kg</string> </map> while I expect (data line only shown). <string name="weight">kg</string> Also, if I go change only 1 preference, the same value changes, not a new row is created. I'm just tempted to write my own preference classes that would store data in files or DB, but I know that preferences should work, it just doesn't save properly my stuff. Edit Tutorials used: Main Tutorial - Was using this as a base, simplified, as I needed only 3 listPreferences so far. Another One - Used this one back when first installed android, so referred to this one for its section on preferences Code: (Screen loads, so I'm not showing Manifest) public class MyPrefs extends PreferenceActivity { @Override public void onCreate(Bundle bundle) { super.onCreate(bundle); addPreferencesFromResource(R.xml.my_prefs); } } my_prefs.xml <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"> <PreferenceCategory android:title="Value Settings"> <ListPreference android:title="Distance" android:summary="Metric (Kilometer) vs Imperial (Imperial)" android:defaultValue="km" android:key="@+id/distanceMesurement" android:entries="@array/distance" android:entryValues="@array/distance_values"/> <ListPreference android:title="Weight" android:summary="Metric (Kilogram) vs Imperial (Pound)" android:defaultValue="kg" android:key="@+id/weightMesurement" android:entries="@array/weight" android:entryValues="@array/weight_values"/> </PreferenceCategory> </PreferenceScreen> calling MyPrefs from MainScreen Intent i = new Intent(MainScreen.this, MyPrefs.class); startActivity(i); arrays.xml <resources> <string-array name="weight"> <item name="kg">Kilogram (kg)</item> <item name="lb">Pound (lb)</item> </string-array> <string-array name="weight_values"> <item name="kg">kg</item> <item name="lb">lb</item> </string-array> <string-array name="distance"> <item name="km">Kilometer (km)</item> <item name="mi">Mile (mi)</item> </string-array> <string-array name="distance_values"> <item name="km">km</item> <item name="mi">mi</item> </string-array> </resources>

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• LUA: A couple of pattern matching issues

  - by Josh

  I'm fairly new to lua programming, but I'm also a quick study. I've been working on a weather forecaster for a program that I use, and it's working well, for the most part. Here is what I have so far. (Pay no attention to the zs.stuff. That is program specific and has no bearing on the lua coding.) if not http then http = require("socket.http") end local locale = string.gsub(zs.params(1),"%s+","%%20") local page = http.request("http://www.wunderground.com/cgi-bin/findweather/getForecast?query=" .. locale .. "&wuSelect=WEATHER") local location = string.match(page,'title="([%w%s,]+) RSS"') --print("Gathering weather information for " .. location .. ".") --local windspeed = string.match(page,'<span class="nobr"><span class="b">([%d.]+)</span>&nbsp;mph</span>') --print(windspeed) local condition = string.match(page, '<td class="vaM taC"><img src="http://icons-ecast.wxug.com/i/c/a/[%w_]+.gif" width="42" height="42" alt="[%w%s]+" class="condIcon" />') --local image = string.match(page, '<img src="http://icons-ecast.wxug.com/i/c/a/(.+).gif" width="42" height="42" alt="[%w%s]+" class="condIcon" />') local temperature = string.match(page,'pwsvariable="tempf" english="&deg;F" metric="&deg;C" value="([%d.]+)">') local humidity = string.match(page,'pwsvariable="humidity" english="" metric="" value="(%d+)"') zs.say(location) --zs.say("image ./Images/" .. image .. ".gif") zs.say("<color limegreen>Condition:</color> <color white>" .. condition .. "</color>") zs.say("<color limegreen>Temperature: </color><color white>" .. temperature .. "F</color>") zs.say("<color limegreen>Humidity: </color><color white>" .. humidity .. "%</color>") My main issue is this: I changed the 'condition' and added the 'image' variables to what they are now. Even though the line it's supposed to be matching comes directly from the webpage, it fails to match at all. So I'm wondering what it is I'm missing that's preventing this code from working. If I take out the <td class="vaM taC">< img src="http://icons-ecast.wxug.com/i/c/a/[%w_]+.gif" it'll match condition flawlessly. (For whatever reason, I can't get the above line to display correctly, but there is no space between the `< and img) Can anyone point out what is wrong with it? Aside from the pattern matching, I assure you the line is verbatim from the webpage. Another question I had is the ability to match across line breaks. Is there any possible way to do this? The reason why I ask is because on that same page, a few of the things I need to match are broken up on separate lines, and since the actual pattern I'm wanting to match shows up in other places on the page, I need to be able to match across line breaks to get the exact pattern. I appreciate any help in this matter!

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• Python/numpy tricky slicing problem

  - by daver

  Hi stack overflow, I have a problem with some numpy stuff. I need a numpy array to behave in an unusual manner by returning a slice as a view of the data I have sliced, not a copy. So heres an example of what I want to do: Say we have a simple array like this: a = array([1, 0, 0, 0]) I would like to update consecutive entries in the array (moving left to right) with the previous entry from the array, using syntax like this: a[1:] = a[0:3] This would get the following result: a = array([1, 1, 1, 1]) Or something like this: a[1:] = 2*a[:3] # a = [1,2,4,8] To illustrate further I want the following kind of behaviour: for i in range(len(a)): if i == 0 or i+1 == len(a): continue a[i+1] = a[i] Except I want the speed of numpy. The default behavior of numpy is to take a copy of the slice, so what I actually get is this: a = array([1, 1, 0, 0]) I already have this array as a subclass of the ndarray, so I can make further changes to it if need be, I just need the slice on the right hand side to be continually updated as it updates the slice on the left hand side. Am I dreaming or is this magic possible? Update: This is all because I am trying to use Gauss-Seidel iteration to solve a linear algebra problem, more or less. It is a special case involving harmonic functions, I was trying to avoid going into this because its really not necessary and likely to confuse things further, but here goes. The algorithm is this: while not converged: for i in range(len(u[:,0])): for j in range(len(u[0,:])): # skip over boundary entries, i,j == 0 or len(u) u[i,j] = 0.25*(u[i-1,j] + u[i+1,j] + u[i, j-1] + u[i,j+1]) Right? But you can do this two ways, Jacobi involves updating each element with its neighbours without considering updates you have already made until the while loop cycles, to do it in loops you would copy the array then update one array from the copied array. However Gauss-Seidel uses information you have already updated for each of the i-1 and j-1 entries, thus no need for a copy, the loop should essentially 'know' since the array has been re-evaluated after each single element update. That is to say, every time we call up an entry like u[i-1,j] or u[i,j-1] the information calculated in the previous loop will be there. I want to replace this slow and ugly nested loop situation with one nice clean line of code using numpy slicing: u[1:-1,1:-1] = 0.25(u[:-2,1:-1] + u[2:,1:-1] + u[1:-1,:-2] + u[1:-1,2:]) But the result is Jacobi iteration because when you take a slice: u[:,-2,1:-1] you copy the data, thus the slice is not aware of any updates made. Now numpy still loops right? Its not parallel its just a faster way to loop that looks like a parallel operation in python. I want to exploit this behaviour by sort of hacking numpy to return a pointer instead of a copy when I take a slice. Right? Then every time numpy loops, that slice will 'update' or really just replicate whatever happened in the update. To do this I need slices on both sides of the array to be pointers. Anyway if there is some really really clever person out there that awesome, but I've pretty much resigned myself to believing the only answer is to loop in C.

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