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• Displaying Fields (and/instead of Properties) in a PropertyGrid

  - by Jenk

  I'd like to use a PropertyGrid to manipulate the data on some objects, however these objects don't have properties, they have fields. Thus a property grid doesn't display them (high five MS!) Before anyone posts "just use properties": I can't at the moment.. these objects are DTOs and are used to send data to a VB6 Interop dll, thus all the parameters for the method calls are "ref" parameters (high five MS!), and C# won't compile if you use a property instead of a field or variable (high five MS!). No, I am not going to create local variables for every property on any given object. There many, many fields, and many, many test cases that would need updating, as well as the production code it self, and this post/question may be the path of least resistance. :)

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• Need help understanding some Python code

  - by Yarin

  I'm new to Python, and stumped by this piece of code from the Boto project: class SubdomainCallingFormat(_CallingFormat): @assert_case_insensitive def get_bucket_server(self, server, bucket): return '%s.%s' % (bucket, server) def assert_case_insensitive(f): def wrapper(*args, **kwargs): if len(args) == 3 and not (args[2].islower() or args[2].isalnum()): raise BotoClientError("Bucket names cannot contain upper-case " \ "characters when using either the sub-domain or virtual " \ "hosting calling format.") return f(*args, **kwargs) return wrapper Trying to understand what's going on here. What is the '@' symbol in @assert_case_sensitive ? What do the args *args, **kwargs mean? What does 'f' represent? Thanks!

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• How do I load multiple FLV files, with the same COMPLETE event handler?

  - by Josamoto

  When loading files with the Loader in ActionScript 3, I am able to inspect the event attribute on the complete event handler to determine what the URL is for the file that has completed downloading. Loader exposes a variable in the event handler attribute: event.target.url which I means that when the handler returns, I can easily determine which file is loading. However, my client has sent numerous FLV files built in After Effects that constitute the UI elements of a Flash application built for them. Loading FLV files require the use of URLLoader, and this does not appear to expose the name of the file being loaded. So I either need to convert the FLV's to SWF, so I can load them as normal. Is there a way to determine the URL inside the onComplete event handler fired by URLLoader?

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• NHibernate 3 and MySQL setup tutorial

  - by ryanzec

  Since I have given up on using the entity framework 4 as my ORM (getting it to work with MySQL and mapping table/field names like this_table/this_field to object naming like ThisTable/ThisField is POCO) I am now looking at NHibernate as it seems the the next big well know ORM for C# that probably with not die off any time soon. I am trying to lookup some tutorials and a lot of them in the configuration section have 2-2 in it and was wondering if those configuration would work with NHibernate 3? I am just curious if the 2-2 refers to the version of NHibernate or something different.

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• Eval IronPython Scripts during ASP.NET Web Request; Static Engine or Not

  - by Josh Pearce

  I would like to create an ASP.NET MVC web application which has extensible logic that does not require a re-build. I was thinking of creating a filter which had an instance of the IronPython engine. What I would like to know is: how much overhead is there in creating a new engine during each web request, and would it be a better idea to keep a static engine around? However, if I were to keep a single static engine around, what are the issues I might run into as far as locking and script scope? Is it possible to have multiple scopes in the same IropPython engine so I don't get variable collision and security issues between web requests?

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• (Django) Trim whitespaces from charField

  - by zardon

  How do I strip whitespaces (trim) from the end of a charField in Django? Here is my Model, as you can see I've tried putting in clean methods but these never get run. I've also tried doing name.strip(), models.charField().strip() but these do not work either. Is there a way to force the charField to trim automatically for me? Thanks. class Employee(models.Model): """(Workers, Staff, etc)""" name = models.CharField(blank=True, null=True, max_length=100) # This never gets run def clean_variable(self): data = self.cleaned_data['variable'].strip() return data def __unicode__(self): return self.name class Meta: verbose_name_plural = 'Employees' # This never gets run either class EmployeesForm(forms.ModelForm): class Meta: model = Employee def clean_description(self): #if not self.cleaned_data['description'].strip(): # raise forms.ValidationError('Your error message here') self.cleaned_data['name'].strip()

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• Managing StringBuilder Resources in C#

  - by Jim Fell

  Hello. My C# (.NET 2.0) application has a StringBuilder variable with a capacity of 2.5MB. Obviously, I do not want to copy such a large buffer to a larger buffer space every time it fills. By that point, there is so much data in the buffer anyways, removing the older data is a viable option. Can anyone see any obvious problems with how I'm doing this (i.e. am I introducing more performance problems than I'm solving), or does it look okay? tText_c = new StringBuilder(2500000, 2500000); private void AppendToText(string text) { if (tText_c.Length * 100 / tText_c.Capacity > 95) { tText_c.Remove(0, tText_c.Length / 2); } tText_c.Append(text); } Thanks.

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• n*n blocks and polygons

  - by OSaad

  Hi, this is actually meant to be for a function called roipoly in matlab but it can be considered a general case problem. Roipoly is a function which lets u select a polygon over an image, and returns a binary mask where u can use it to get indices of the desired polygon. (It is just a normal polygon after all). My application (K-Nearest Neighbor) requires that i make n*n blocks out of the data i have (the polygon), i.e. If i have a polygon (a road or a piece of land), i want a n*n square moving over it while avoiding intersection with edges and putting those n*n pixels into some variable. This problem would be a lot easier if i had all my shapes in the form of rectangles, but that unfortunately isn't the case. I might have something going diagonal, circular or just irregular.

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• Ruby on Rails when create method fails, render loses local variables

  - by Jimmy

  Hey guys I have a simple create method with some validations and whenever the create method fails due to validation errors it re-renders the 'new' action. The problem is in my new action/view I have a local variable that is established in the action and passed to a partial to render some related information to what the user is creating. Now when my create action fails and I try to re-render the 'new' action I'm getting the always awesome undefined method `cover' for nil:NilClass error. What is the best way to handle re-establishing my action's local variables on a render instead of redirecting to the action again and the user losing the data they input?

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• ASP.Net MVC - which is the best approach for multi select grouping using JQuery Dialog

  - by Rajeesh

  This is my scenario I have an view(page) with list of items, a user could select single or multiple items from this page and click on a "Add to Group" button. Then a modal dialog(JQuery dialog) will be shown, from that he could select group, then press the add button. Which causes the items selected in the parent page is added to that particular group. So, which is the best way to pass the selected items to the modal pop-up? Though the query string ? - what happens if the no:of items selected is large, will the url support that much characters Keep the list in the parent page in a javascript variable and return the selected group from the modal pop-up? Or is there is any other better option? Thanks, Rajeesh

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• How do you use multiple versions of the same R package?

  - by Richie Cotton

  In order to be able to compare two versions of a package, I need to able to choose which version of the package that I load. R's package system is set to by default to overwrite existing packages, so that you always have the latest version. How do I override this behaviour? My thoughts so far are: I could get the package sources, edit the descriptions to give different names and build, in effect, two different packages. I'd rather be able to work directly with the binaries though, as it is much less hassle. I don't necessarily need to have both versions of the packages loaded at the same time (just installed somewhere at the same time). I could perhaps mess about with Sys.getenv('R_HOME') to change the place where R installs the packages, and then .libpaths() to change the place where R looks for them. This seems hacky though, so does anyone have any better ideas?

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• Error(2,7): PLS-00428: an INTO clause is expected in this SELECT statement

  - by omgzor

  I'm trying to create this trigger and getting the following compiler errors: create or replace TRIGGER RESTAR_PLAZAS AFTER INSERT ON PLAN_VUELO BEGIN SELECT F.NRO_VUELO, M.CAPACIDAD, M.CAPACIDAD - COALESCE(( SELECT count(*) FROM PLAN_VUELO P WHERE P.NRO_VUELO = F.NRO_VUELO ), 0) as PLAZAS_DISPONIBLES FROM VUELO F INNER JOIN MODELO M ON M.ID = F.CODIGO_AVION; END RESTAR_PLAZAS; Error(2,7): PL/SQL: SQL Statement ignored Error(8,5): PL/SQL: ORA-00933: SQL command not properly ended Error(8,27): PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: begin case declare end exception exit for goto if loop mod null pragma raise return select update while with <an identifier> <a double-quoted delimited-identifier> <a bind variable> << close current delete fetch lock insert open rollback savepoint set sql execute commit forall merge pipe Error(2,1): PLS-00428: an INTO clause is expected in this SELECT statement What's wrong with this trigger?

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• How to test if a string is inside a list of predinfined list of string in oracle pl/sql

  - by drupalspring

  I define a list a string which contains different country codes ( for example , USA ,CHINA ,HK ,JPN) How can I check that if a input variable equal to one of the country of the country list in pl/sql . I use the following code to test it but fail, how can I revise it? declare country_list CONSTANT VARCHAR2(200) := USA,CHINA,HK,JPN; input VARCHAR2(200); begin input := 'JPN'; IF input IN (country_list) DBMS_OUTPUT.PUT_LINE('It is Inside'); else DBMS_OUTPUT.PUT_LINE('It is not Inside'); END IF; end;

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• basic json > struct question

  - by danwoods

  I'm working with twitter's api, trying to get the json data from http://search.twitter.com/trends/current.json which looks like: {"as_of":1268069036,"trends":{"2010-03-08 17:23:56":[{"name":"Happy Women's Day","query":"\"Happy Women's Day\" OR \"Women's Day\""},{"name":"#MusicMonday","query":"#MusicMonday"},{"name":"#MM","query":"#MM"},{"name":"Oscars","query":"Oscars OR #oscars"},{"name":"#nooffense","query":"#nooffense"},{"name":"Hurt Locker","query":"\"Hurt Locker\""},{"name":"Justin Bieber","query":"\"Justin Bieber\""},{"name":"Cmon","query":"Cmon"},{"name":"My World 2","query":"\"My World 2\""},{"name":"Sandra Bullock","query":"\"Sandra Bullock\""}]}} My structs look like: type trend struct { name string query string } type trends struct { id string arr_of_trends []trend } type Trending struct { as_of string trends_obj trends } and then I parse the JSON into a variable of type Trending. I'm very new to JSON so my main concern is making sure I've have the data structure correctly setup to hold the returned json data. I'm writing this in 'Go' for a project for school. (This is not part of a particular assignment, just something I'm demo-ing for a presentation on the language)

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• BizTalk external assembly namespace and static methods

  - by SteveC

  Is there some restriction in BizTalk 2006 R2 to accessing static methods in external assemblies when the assembly has a "." in the name ? I have the solution set-up with the BizTalk project "FooBar", and the external assembly project "FooBar.Helper" (strongly signed and GAC'ed) with a class "Demo" (public and serializable), which is referenced in the BizTalk project I can create a BizTalk variable of type "FooBar.Helper.Demo" and access an instance method fine, but an expression window the Intellisense shows the FooBar namespace, but if I dot it, I get the error "illegal dotted name" ??? However I can add another project, "ExtComp" with class "Test" and it's static methods are displayed in Intellisense !!! The only difference I can see is the first external assembly has the dot in it

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• Dynamic allocated array is not freed

  - by Stefano

  I'm using the code above to dynamically allocate an array, do some work inside the function, return an element of the array and free the memory outside of the function. But when I try to deallocate the array it doesn't free the memory and I have a memory leak. The debugger pointed to the myArray variable shows me the error CXX0030. Why? struct MYSTRUCT { char *myvariable1; int myvariable2; char *myvariable2; .... }; void MyClass::MyFunction1() { MYSTRUCT *myArray= NULL; MYSTRUCT *myElement = this->MyFunction2(myArray); ... delete [] myArray; } MYSTRUCT* MyClass::MyFunction2(MYSTRUCT *array) { array = (MYSTRUCT*)operator new(bytesLength); ... return array[X]; }

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• any equivalent to VB.net function name as return value in C#?

  - by user1179861

  In vb.net there is a weird approach that you can use the function name as the result variable.. example: Function Foo(ByVal bar As Integer) As List(Of Integer) Foo = New List(Of Integer) Foo.Add(bar + 1) End Function As far as i know, in C# you have to: List<int> foo(int bar) { var result = new List<int>(); result.Add(bar + 1); return result; } I'm not sure if it's by design or i just don't know the right way to do this.. Please enlight me! Thanks in advance, Eitan.

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• Why does DestroyWindow close my application?

  - by user146780

  I'v created a window after creating my main one but calling DestroyWindow on its handle closes the entire application, how can I simply get rid of it? it looks like this: BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; HWND fakehandle; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW | WS_EX_LAYERED, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); fakehandle = CreateWindow(szWindowClass, "FAKE WINDOW", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd || !fakehandle) { return FALSE; } //some code DestroyWindow(fakehandle); ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } how can I destroy this window without destroying my main one? I'm creating a dummy window to check for multisampling in OpenGL. Thanks

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• Optimising (My)SQL Query

  - by Simon

  I usually use ORM instead of SQL and I am slightly out of touch on the different JOINs... SELECT `order_invoice`.*, `client`.*, `order_product`.*, SUM(product.cost) as net FROM `order_invoice` LEFT JOIN `client` ON order_invoice.client_id = client.client_id LEFT JOIN `order_product` ON order_invoice.invoice_id = order_product.invoice_id LEFT JOIN `product` ON order_product.product_id = product.product_id WHERE (order_invoice.date_created >= '2009-01-01') AND (order_invoice.date_created <= '2009-02-01') GROUP BY `order_invoice`.`invoice_id` The tables/ columns are logically names... it's an shop type application... the query works... it's just very very slow... I use the Zend Framework and would usually use Zend_Db_Table_Row::find(Parent|Dependent)Row(set)('TableClass') but I have to make lots of joins and I thought it'll improve performance by doing it all in one query instead of hundreds... Can I improve the above query by using more appropriate JOINs or a different implementation? Many thanks.

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• Where's the font setting for folders in the Package Explorer?

  - by Carl Smotricz

  I'm talking about Eclipse (3.5 = Galileo), running under Kubuntu 9.10 and I have the Subversive plugin. I've been moved from Gnome-Ubuntu to Kubuntu, and one side effect was that some fonts are now just too tiny to read. File names in the explorer have a decent size, but folders are shown in a too-small font, and after having adjusted all the fonts in General|Appearance|Colors and Fonts the folders are unchanged. Maybe I'm just blind. I'd appreciate it if someone could point me to where I can adjust the font for folders in the Package Explorer

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• PHP: How to Pass child class __construct() arguments to parent::__construct() ?

  - by none

  I have a class in PHP like so: class ParentClass { function __construct($arg) { // Initialize a/some variable(s) based on $arg } } It has a child class, as such: class ChildClass extends ParentClass { function __construct($arg) { // Let the parent handle construction. parent::__construct($arg); } } What if, for some reason, the ParentClass needs to change to take more than one optional argument, which I would like my Child class to provide "just in case"? Unless I re-code the ChildClass, it will only ever take the one argument to the constructor, and will only ever pass that one argument. Is this so rare or such a bad practice that the usual case is that a ChildClass wouldn't need to be inheriting from a ParentClass that takes different arguments? Essentially, I've seen in Python where you can pass a potentially unknown number of arguments to a function via somefunction(*args) where 'args' is an array/iterable of some kind. Does something like this exist in PHP? Or should I refactor these classes before proceeding?

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• How can a running application in Linux/*nix determine its own absolute path?

  - by Dave Wade-Stein

  Suppose you run the application 'app' by typing 'app', rather than its absolute path. Due to your $PATH variable, what actually runs is /foo/bar/app. From inside app I'd like to determine /foo/bar/app. argv[0] is just 'app', so that doesn't help. I know in Linux I can get do pid = getpid(); and then look at the /proc/pid/exe softlink, but that doesn't work on other *nix. Is there a more portable way to determine the dir in which the app lives?

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• how to add parameters with mulitselection enabled in ssrs 2008

  - by Sheikh Usman

  Hi, I have a table called Resource, and i am making a line chart (the chart is complicated, so just assume its a simple xy line chart). I want to execute the report with different resources. I have added a new parameter and bound it to a dataset to return a dropdownlist of resource names. Can i do a mulitiple selection of resource. for example if i want to make chart with ResourceA and ResourceB, only, can i select these two resources from the dropdownlist of parameters. cheers, Oz

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• CakePHP: Ajax view problem (nothing in the view showing)

  - by Adim

  I created a function in my controller called addToPlaylist($songName). I wanted to add these song names to an array and then a session variable using an Ajax call. The first time i did this i got an error saying i do not have a template file to display in the chosen div ("add_to_playlist.ctp was missing"). I created this file and everything seemed to be working correctly. Basically I went to bed woke up and it is broken (it is possible I changed something before I went to bed). The problem now is that it does not show anything when i click the ajax link. when i click on the ajax link it seems to call the function but nothing displays in the view (except debug info) even when i delete the view (add_to_playlist.ctp) i get no errors, I just see debug info now.

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• Double indirection and structures passed into a function

  - by ZPS

  I am curious why this code works: typedef struct test_struct { int id; } test_struct; void test_func(test_struct ** my_struct) { test_struct my_test_struct; my_test_struct.id=267; *my_struct = &my_test_struct; } int main () { test_struct * main_struct; test_func(&main_struct); printf("%d\n",main_struct->id); } This works, but pointing to the memory address of a functions local variable is a big no-no, right? But if i used a structure pointer and malloc, that would be the correct way, right? void test_func(test_struct ** my_struct) { test_struct *my_test_struct; my_test_struct = malloc(sizeof(test_struct)); my_test_struct->id=267; *my_struct = my_test_struct; } int main () { test_struct * main_struct; test_func(&main_struct); printf("%d\n",main_struct->id); }

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