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• __spin_lock while writing the bytes in NSOutputStream

  - by Mohammed Sadiq

  HI all, I have a issue that when I try to write some bytes in the outputstream, I am getting the bad access. The code is as follows : int writtenBytes = [_os write:[packetInBytes bytes] maxLength:lengthOfPacket]; where the "packetInBytes" points to NSData and "lengthOfPacket" corresponds to the data length, and _os represents the NSOutputStream. The call stack from the debugger is as follows : 0 0xffff0269 in __spin_lock 1 0x302a6098 in CFSocketDisableCallBacks 2 0x003b46d0 in SocketStream::write 3 0x302402c3 in CFWriteStreamWrite 4 0x0001b423 in -[Writer write:] at Writer.m:96 5 0x0001b5ef in -[Writer run] at Writer.m:111 6 0x3050a79d in -[NSThread main] 7 0x3050a338 in NSThread__main 8 0x91a27fe1 in _pthread_start 9 0x91a27e66 in thread_start** I am not getting this issue always. I get this issue execute my code for some 5 or more times ... I have checked all the params that i pass to the write function have its values and not nil. Any help would be greatly appreciated Best Regards, MOhammed Sadiq.

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• Inserting mutable pairs into a mutable list

  - by Romelus

  How can I push a mutable pair onto a stack such that i'm only creating one stack. I have some code that works but creates lists within lists within lists.... Here is what I believe should work but throws an error. (define func (arg1 arg2 arg3) // Where arg3 is an empty list (mappend (mcons arg1 arg2) arg3)) The above code complains and says: "mcar: expects argument of type ; given ... Can anyone show me how I can get a result that looks like so,: (list (arg1 arg2) (arg# arg#) ...)

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• Python/Django: Which authorize.net library should I use?

  - by Parand

  I need authorize.net integration for subscription payments, likely using CIM. The requirements are simple - recurring monthly payments, with a few different price points. Customer credit card info will be stored a authorize.net . There are quite a few libraries and code snippets around, I'm looking for recommendations as to which work best. Satchmo seems more than I need, and it looks like it's complex. Django-Bursar seems like what I need, but it's listed as alpha. The adroll/authorize library also looks pretty good. The CIM XML APIs don't look too bad, I could connect directly with them. And there are quite a few other code snippets. What's the best choice right now, given my fairly simple requirements?

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• CSS for https urls

  - by Vincent

  Hello, looking for some help with images referenced within the stylesheet. I have no problems with these from non secure locations within the site but only from https. The stylesheet loads fine and displays everything correctly except for the images. example: body { margin: 0; padding: 0; background: url(/img/background_tile.gif) top left repeat-x; text-align: center; background-color: #fff; } All my css files and other image paths inside the code use relative urls to images. How can I make sure they all work fine without hard coding my image paths with https or http? I want the code to work fine with http and https. Thanks

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• Is it possible to mask CALayer in iPhone?

  - by Eonil

  I'm trying to mask CALayer with a bitmap image. And I failed masking CALayer. My code is: // 'PreloadViewController layerWithImageNamed' create a layer and set it's contents as specified UIImage. CALayer* title = [PreloadViewController layerWithImageNamed:@"pinkhug_txt.png"]; [[[self view] layer] addSublayer:title]; CALayer* title_mask = [PreloadViewController layerWithImageNamed:@"hug_mask.png"]; [title setMask:title_mask]; The Apple reference says "CALayer in iPhone does not support mask property". But there is a postings about this on SO. Is it possible? Or what's wrong with my code?

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• UITableview titleForHeaderInSection not displaying correctly

  - by mjdth

  I have some VERY simple code to return the title for a section header: - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if (section==0) { return @""; } else if (section==1) { return @"Actions"; } else if (section==2) { return @"Attached To"; } return @""; } For some reason when the headers are actually displayed on the simulator, half of the time they're simply the first letter and then ellipses. Scrolling up and down (to refresh the header view most likely) will result in the title showing correctly roughly half the time and showing incorrectly the other half of the time. Do anyone have any idea what could be causing this? I think this is more of a recent development, but it seems to happen in almost all UITableViews in my application. I don't want to say this is a 3.2 issue, but it might have started happening around then, but either way it must be related to the code somehow. Thank you.

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• J: Self-reference in bubble sort tacit implementation

  - by Yasir Arsanukaev

  Hello people! Since I'm beginner in J I've decided to solve a simple task using this language, in particular implementing the bubblesort algorithm. I know it's not idiomatically to solve such kind of problem in functional languages, because it's naturally solved using array element transposition in imperative languages like C, rather than constructing modified list in declarative languages. However this is the code I've written: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # Let's apply it to an array: (((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # 5 3 8 7 2 2 3 5 7 8 The thing that confuses me is $: referring to the statement within the outermost parentheses. Help says that: $: denotes the longest verb that contains it. The other book (~ 300 KiB) says: 3+4 7 5*20 100 Symbols like + and * for plus and times in the above phrases are called verbs and represent functions. You may have more than one verb in a J phrase, in which case it is constructed like a sentence in simple English by reading from left to right, that is 4+6%2 means 4 added to whatever follows, namely 6 divided by 2. Let's rewrite my code snippet omitting outermost ()s: ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # 5 3 8 7 2 2 3 5 7 8 Reuslts are the same. I couldn't explain myself why this works, why only ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is treated as the longest verb for $: but not the whole expression ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) ^: # and not just (<./@(2&{.)), $:@((>./@(2&{.)),2&}.), because if ((<./@(2&{.)), $:@((>./@(2&{.)),2&}.)) ^: (1<#) is a verb, it should also form another verb after conjunction with #, i. e. one might treat the whole sentence (first snippet) as a verb. Probably there's some limit for the verb length limited by one conjunction. Look at the following code (from here): factorial =: (* factorial@<:) ^: (1&<) factorial 4 24 factorial within expression refers to the whole function, i. e. (* factorial@<:) ^: (1&<). Following this example I've used a function name instead of $:: bubblesort =: (((<./@(2&{.)), bubblesort@((>./@(2&{.)),2&}.)) ^: (1<#)) ^: # bubblesort 5 3 8 7 2 2 3 5 7 8 I expected bubblesort to refer to the whole function, but it doesn't seem true for me since the result is correct. Also I'd like to see other implementations if you have ones, even slightly refactored. Thanks.

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• ASP-style tags for Perl web development?

  - by Alex R

  I feel like I'm traveling 10 years back in time by asking this, but... Are there any modules, patches, or any "new" version of Perl (released in the last 10 years) to enable writing web-oriented Perl scripts using ASP-style tags? e.g. from ASP/JSP some html <% some code %> more HTML e.g. from PHP some html <? some code ?> more HTML Please don't worry about "why" I'm asking this... It's related to programming language research.

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• Zend Framework: How to include an OR statement in an SQL fetchAll()

  - by Scoobler

  I am trying to build the following SQL statement: SELECT users_table.*, users_data.first_name, users_data.last_name FROM users_table INNER JOIN users_data ON users_table.id = user_id WHERE (users_table.username LIKE '%sc%') OR (users_data.first_name LIKE '%sc%') OR (users_data.last_name LIKE '%sc%') I have the following code at the moment: public function findAllUsersLike($like) { $select = $this-select(Zend_Db_Table::SELECT_WITH_FROM_PART)-setIntegrityCheck(false); $select-where('users_table.username LIKE ?', '%'.$like.'%'); $select-where('users_data.first_name LIKE ?', '%'.$like.'%'); $select-where('users_data.last_name LIKE ?', '%'.$like.'%'); $select-join('users_data', 'users_table.id = user_id', array('first_name', 'last_name')); return $this-fetchAll($select); } This is close, but not right as it uses AND to add the extra WHERE statements, instead of OR. Is there any way to do this as one select? Or should I perform 3 selects and combine the results (alot more overhead?)? P.S. The parameter $like that is past is sanitized so don't need to wory about user input in the code above!

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• HOM with Objective C

  - by Coxer

  Hey, i am new to objective C, but i tried to use HOM in order to iterate over an NSArray and append a string to each element. here is my code: void print( NSArray *array ) { NSEnumerator *enumerator = [array objectEnumerator]; id obj; while ( nil!=(obj = [enumerator nextObject]) ) { printf( "%s\n", [[obj description] cString] ); } } int main( int argc, const char *argv[] ) { NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; NSArray *names = [[NSArray alloc] init]; NSArray *names_concat = [[NSArray alloc] init]; names = [NSArray arrayWithObjects:@"John",@"Mary",@"Bob",nil]; names_concat = [[names collect] stringByAppendingString: @" Doe"]; print(names_concat); [pool release]; } What is wrong with this code? My compiler (gcc) says NSArray may not respond to "-collect"

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• Which is faster in Python: x**.5 or math.sqrt(x)?

  - by Casey

  I've been wondering this for some time. As the title say, which is faster, the actual function or simply raising to the half power? UPDATE This is not a matter of premature optimization. This is simply a question of how the underlying code actually works. What is the theory of how Python code works? I sent Guido van Rossum an email cause I really wanted to know the differences in these methods. My email: There are at least 3 ways to do a square root in Python: math.sqrt, the '**' operator and pow(x,.5). I'm just curious as to the differences in the implementation of each of these. When it comes to efficiency which is better? His response: pow and ** are equivalent; math.sqrt doesn't work for complex numbers, and links to the C sqrt() function. As to which one is faster, I have no idea...

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• How to treat an instance variable as an instance of another type in C#

  - by Ben Aston

  I have a simple inheritance heirarchy with MyType2 inheriting from MyType1. I have an instance of MyType1, arg, passed in as an argument to a method. If arg is an instance of MyType2, then I'd like to perform some logic, transforming the instance. My code looks something like the code below. Having to create a new local variable b feels inelegant - is there a way of achieving the same behavior without the additional local variable? public MyType1 MyMethod(MyType1 arg) { if(arg is MyType2) { MyType2 b = arg as MyType2; //use b (which modifies "arg" as "b" is a reference to it)... } return arg; }

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• iPhone: [subview release] removes my subview from the display

  - by Stefan Klumpp

  I have these two pieces of code. The first one works perfectly: UIView *tmp = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 60.0f, 296.0f, 44.0f)]; [self.dynamicView addSubview:tmp]; [tmp release]; The second one is pretty much the same, but the view doesn't show up. CommentBox *commentBox = [[CommentBox alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 296.0f, 44.0f)]; [self.dynamicView addSubview:commentBox]; [commentBox release]; // Why does this remove the view? If I remove the [commentBox release] the view surprisingly appears. But I don't see a different between these two code snippets. The init for the CommentBox looks like this: - (id)initWithFrame:(CGRect)frame { if ((self = [super initWithFrame:frame])) { // Load the nib: NSArray *nibObjects = [[NSBundle mainBundle] loadNibNamed:@"CommentBox" owner:self options:nil]; self = [nibObjects objectAtIndex:0]; } return self; }

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• Error calling webservice using JSONP + jquery with IE on remote domain

  - by Jay Heavner

  I have a .Net webservice on my app server that returns data formatted as JSONP. I have an HTML test client on that server which works fine using IE, Firefox, & Chrome. If I copy the same HTML to my workstation or deploy to my webserver it works with Firefox & Chrome but in IE I'm getting two javascript errors. Message: Object doesn't support this property or method Line: 1 Char: 1 Code: 0 URI: http://mydomain/WebServices/LyrisProxy/Services/Lyris/JSONP/Lyris.asmx/AddUser?lyrisInstance="1"&email="[email protected]"&fullName="My Name"&lyrisList="listname"&format=json&callback=jsonp1274109819864&_=1274109829665 Message: Member not found. Line: 59 Char: 209 Code: 0 URI: http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js I'm kind of at loss as to what to do to fix this.

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• C# run Javascript from button click

  - by ABB

  I have a button on my .aspx interstitial page. When I click it the onClick event fires off and it does a bunch of validations in the code. I have a javascript function that I need to call/run AFTER these validations are performed. This javascript function closes the interstitial page. How can I call the javascript function from my C# code? I've tried adding a script manager and a client script but neither work. What else besides these two options do I have? I'd be willing to use a hack if it works. Javascript I'm using: javascript:parent.interstitialBox.closeit(); return false

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• Rotation Matrix calculates by column not by row

  - by pinnacler

  I have a class called forest and a property called fixedPositions that stores 100 points (x,y) and they are stored 250x2 (rows x columns) in MatLab. When I select 'fixedPositions', I can click scatter and it will plot the points. Now, I want to rotate the plotted points and I have a rotation matrix that will allow me to do that. The below code should work: theta = obj.heading * pi/180; apparent = [cos(theta) -sin(theta) ; sin(theta) cos(theta)] * obj.fixedPositions; But it wont. I get this error. ??? Error using == mtimes Inner matrix dimensions must agree. Error in == landmarkslandmarks.get.apparentPositions at 22 apparent = [cos(theta) -sin(theta) ; sin(theta) cos(theta)] * obj.fixedPositions; When I alter forest.fixedPositions to store the variables 2x250 instead of 250x2, the above code will work, but it wont plot. I'm going to be plotting fixedPositions constantly in a simulation, so I'd prefer to leave it as it, and make the rotation work instead. Any ideas? Also, fixed positions, is the position of the xy points as if you were looking straight ahead. i.e. heading = 0. heading is set to 45, meaning I want to rotate points clockwise 45 degrees. Here is my code: classdef landmarks properties fixedPositions %# positions in a fixed coordinate system. [x, y] heading = 45; %# direction in which the robot is facing end properties (Dependent) apparentPositions end methods function obj = landmarks(numberOfTrees) %# randomly generates numberOfTrees amount of x,y coordinates and set %the array or matrix (not sure which) to fixedPositions obj.fixedPositions = 100 * rand([numberOfTrees,2]) .* sign(rand([numberOfTrees,2]) - 0.5); end function obj = set.apparentPositions(obj,~) theta = obj.heading * pi/180; [cos(theta) -sin(theta) ; sin(theta) cos(theta)] * obj.fixedPositions; end function apparent = get.apparentPositions(obj) %# rotate obj.positions using obj.facing to generate the output theta = obj.heading * pi/180; apparent = [cos(theta) -sin(theta) ; sin(theta) cos(theta)] * obj.fixedPositions; end end end P.S. If you change one line to this: obj.fixedPositions = 100 * rand([2,numberOfTrees]) .* sign(rand([2,numberOfTrees]) - 0.5); Everything will work fine... it just wont plot.

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• What's the best method to be overloaded in ViewPage for inserting some script to all ViewPage?

  - by Soul_Master

  I want to insert some script that is required for my JavaScript library in all view pages. I know that Asp.net MVC is built on Asp.net Framework. Therefore, I can override many methods in “System.Web.UI.Page” class that is a parent of “System.Web.Mvc.ViewPage” class. Nevertheless, I can do it by override Render method but it makes all view pages be invalid for XHTML 1.0 strict. Correct JavaScript must be placed in header tag of HTML document. public class ViewPage<TModel> : ViewPage where TModel : class { protected override void Render(System.Web.UI.HtmlTextWriter writer) { base.Render(writer); writer.Write("<script type='text/javascript>applicationPath = window.applicationPath = 'somePath';</script>"); } } Thanks, PS. I know I can create some code in each master page for doing that. However, it is a quite complicate for other developers to start using my JavaScript source code.

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• T-Sql Modify Insert SProc To Update If Exists.

  - by Goober

  Scenario I have a stored procedure written in T-Sql that I use to insert data into a table as XML. Since the data gets updated regularly, I want the rows to be updated if they already exist (Aside from when the application is first run, they will always exist). Question Below is the code of my Insert Sproc, however I cannot seem to workout the Update side of the stored procedure & would appreciate some help. CODE set ANSI_NULLS ON set QUOTED_IDENTIFIER ON go ALTER PROCEDURE [dbo].[INS_Curve] ( @Curve varchar(MAX) ) AS DECLARE @handle int exec sp_xml_preparedocument @handle OUTPUT, @Curve INSERT INTO CurveDB..tblCurve(LoadID,BusinessDate, Factor) SELECT LoadID,BusinessDate, Factor FROM OPENXML(@handle, 'NewDataSet/Table1',2) WITH( LoadID int, BusinessDate DateTime, Factor float ) exec sp_xml_removedocument @handle

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• Emacs: annoying Flymake dialog box.

  - by baol

  Hello I have the following lines in my ~/.emacs.d/init.el (custom-set-variables '(flymake-allowed-file-name-masks (quote ( ("\\.cc\\'" flymake-simple-make-init) ("\\.cpp\\'" flymake-simple-make-init))))) (add-hook 'find-file-hook 'flymake-find-file-hook) When I open a cc/cpp file that has a Makefile with the following content in the same folder I get proper on-the-fly compilation and error reporting (Flymake will check the syntax and report errors and warnings during code editing) .PHONY: check-syntax check-syntax: $(CXX) -Wall -Wextra -pedantic -fsyntax-only $(CHK_SOURCES) The problem is that when I open a .cc file that has no corresponding Makefile i get an annoying dialog box that warns me about flymake being disabled for every file opened. Is there some hook I can use to disable that warning? Can you provide sample elisp code and explanation on how you found the proper hook?

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• Call up last exception on an ASP.NET error page.

  - by Aren B

  I've got an error page here SiteError.aspx and it's configured correctly in the web.config to go there when unhandled exceptions are encountered. I want to use this page to log the exception that triggered it as well because I only want to LOG the errors that the users encounter (i.e. if SiteError.aspx is ever hit.) This is the code I Have: In the OnLoad(...) in SiteError.aspx Exception lastEx = Context.Server.GetLastError(); if (lastEx != null) log.Error("A site error was encountered", lastEx); However, my log is never showing up in my Output, and If i breakpoint on line 2 (in this example) code execution is never interupted (after letting the exception clear to ASP.NET handling in the debugger.

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• Multi Select Checkbox using ListView

  - by Parsa

  I have a CheckBox in the header of ListView. I write a code to select all Checkboxes in ItemTemplate automatically when the user select the checkBox in the header of ListView. This code is useful, when you bind your ListView in DataPager_PreRender. protected void DataPager1_PreRender(object sender, EventArgs e) { //get the user id of the current user Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey; ListView1.DataSource = MyClass.MyStaticMethod(userGuid.ToString()); ListView1.DataBind(); } protected void ListView1_ItemCreated(object sender, ListViewItemEventArgs e) { //Find the checkBox in each Row CheckBox checkBoxRow = e.Item.FindControl("CheckBoxRow") as CheckBox; //Assign the value of checkBoxHeader to the checkBoxRow checkBoxRow.Checked = CheckBoxHeader.Checked; } protected void ListView1_PagePropertiesChanged(object sender, EventArgs e) { // assign false value to the CheckBoxHeader when user click on the DataPager // so if checkboxheader is true in the page 1, when user select Page 2,this check box will be false // therefore all checkbox rows will be false in the new page. if (CheckBoxHeader.Checked == true) CheckBoxHeader.Checked = false; }

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• Need help in gridview displaying data

  - by sumit

  Hi all, I want to display all the data in gridview which i am inserting in runtime. For that i have written code but getting this error. "Both DataSource and DataSourceID are defined on 'GridView1'. Remove one definition." protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { BindData(); } } public void BindData() { string str = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString.ToString(); SqlConnection con = new SqlConnection(str); SqlDataAdapter da = new SqlDataAdapter("select * from Items where ItemId='" + TxtItemId.Text + "'", con); DataSet ds = new DataSet(); da.Fill(ds,"Items"); GridView1.DataSource = ds; GridView1.DataBind(); } Pls modify my code where is my mistake. Thanks, Sumit

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• ExtJS: adding an item to an existent window

  - by farhad

  Hello! How can i add an item to an existent window? I tried win.add() but it does not seem to work. Why? This is my piece of code: function combo_service(winTitle,desc,input_param) { /* parametri */ param=input_param.split(","); /* della forma: param[0]="doc1:text", quindi da splittare di nuovo */ /* cosi' non la creo più volte */ win; if (!win) var win = new Ext.Window({ //title:Ext.get('page-title').dom.innerHTML renderTo:Ext.getBody() ,iconCls:'icon-bulb' ,width:420 ,height:240 ,title:winTitle ,border:false ,layout:'fit' ,items:[{ // form as the only item in window xtype:'form' ,labelWidth:60 ,html:desc ,frame:true ,items:[{ // textfield fieldLabel:desc ,xtype:'textfield' ,anchor:'-18' }] }] }); win.add({ // form as the only item in window xtype:'form' ,labelWidth:60 ,html:desc ,frame:true ,items:[{ // textfield fieldLabel:desc ,xtype:'textfield' ,anchor:'-18' }]}); win.show(); }; What's wrong with my code? Thank you very much.

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• Can you call a SQL Stored Procedure that returns a record set and have those values loaded into vari

  - by codingguy3000

  Hello fellow stackers Please consider the following SQL Server table and stored procedure. create table customers(cusnum int, cusname varchar(50)) insert into customers(cusnum, cusname) values(1, 'Ken') insert into customers(cusnum, cusname) values (2, 'Violet') --The Wife create procedure getcus @cusnum int as Begin select cusname from customers (nolock) where cusnum = @cusnum End You know how you can write T-SQL code like this: declare @cusname varchar(50) select @cusname = cusname from customers where cusnum = 1 Can I do this with my stored procedure? for example the code would look like this: declare @cusnum int declare @cusname varchar(50) set @cusnum = 1 exec @cusname = cusname pbogetcus @cusnum Thanks in advance.

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• Calculating CPU frequency in C with RDTSC always returns 0

  - by Nazgulled

  Hi, The following piece of code was given to us from our instructor so we could measure some algorithms performance: #include <stdio.h> #include <unistd.h> static unsigned cyc_hi = 0, cyc_lo = 0; static void access_counter(unsigned *hi, unsigned *lo) { asm("rdtsc; movl %%edx,%0; movl %%eax,%1" : "=r" (*hi), "=r" (*lo) : /* No input */ : "%edx", "%eax"); } void start_counter() { access_counter(&cyc_hi, &cyc_lo); } double get_counter() { unsigned ncyc_hi, ncyc_lo, hi, lo, borrow; double result; access_counter(&ncyc_hi, &ncyc_lo); lo = ncyc_lo - cyc_lo; borrow = lo > ncyc_lo; hi = ncyc_hi - cyc_hi - borrow; result = (double) hi * (1 << 30) * 4 + lo; return result; } However, I need this code to be portable to machines with different CPU frequencies. For that, I'm trying to calculate the CPU frequency of the machine where the code is being run like this: int main(void) { double c1, c2; start_counter(); c1 = get_counter(); sleep(1); c2 = get_counter(); printf("CPU Frequency: %.1f MHz\n", (c2-c1)/1E6); printf("CPU Frequency: %.1f GHz\n", (c2-c1)/1E9); return 0; } The problem is that the result is always 0 and I can't understand why. I'm running Linux (Arch) as guest on VMware. On a friend's machine (MacBook) it is working to some extent; I mean, the result is bigger than 0 but it's variable because the CPU frequency is not fixed (we tried to fix it but for some reason we are not able to do it). He has a different machine which is running Linux (Ubuntu) as host and it also reports 0. This rules out the problem being on the virtual machine, which I thought it was the issue at first. Any ideas why this is happening and how can I fix it?

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