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  • iPhone: Add background button to view when UITableView has no cells

    - by Nic Hubbard
    I have a UITableViewController, when there is no data to populate the UITableView, I want to add a button, which uses an image. So, rather than the user seeing a tableview with no records, they will see an image that says, "No records have been added, Tap to add one", then they click and we create a new one. I assumed I would just hide the UITableView, then create the button, but I never see the button. Here I am using: if ([[fetchedResultsController sections] count] == 0) { self.tableView.hidden = YES; // Create button w/ image UIButton * btn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; btn.frame = CGRectMake(0, 0, 100, 50); [btn setImage:[UIImage imageNamed:@"no-rides.png"] forState:UIControlStateNormal]; [self.view addSubview:btn]; } Ideas on why I would never see the button? When I show this view, it seems to have a transparent background for a second, then changes white...

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  • How does one implement a truly asynchronous java thread

    - by Ritesh M Nayak
    I have a function that needs to perfom two operations, one which finishes fast and one which takes a long time to run. I want to be able to delegate the long running operation to a thread and I dont care when the thread finishes, but the threads needs to complete. I implemented this as shown below , but, my secondoperation never gets done as the function exits after the start() call. How I can ensure that the function returns but the second operation thread finishes its execution as well and is not dependent on the parent thread ? public void someFunction(String data) { smallOperation() Blah a = new Blah(); Thread th = new Thread(a); th.Start(); } class SecondOperation implements Runnable { public void run(){ // doSomething long running } }

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  • Looping through with double variables

    - by Luke
    I have two arrays with two sets of values in ($a[] and $b[]) I want to do something like the following: $a[0] - $b[0] $a[0] - $b[1] $a[1] - $b[0] $a[1] - $b[1] This will continue until the arrays reach the end. So i want a hyphen to seperate the two arrays, with the first array staying the same until the second array has looped through. I am trying to get this in a dropdown with option value. How could i achieve this? I never tried doing any loops with two varaibles like that before, I literally have no idea at all! Thankyou

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  • Rewriting usort function because of fatal error (PHP bug)

    - by Lionel
    The two following usort functions throw fatal error Base lambda function for closure not found in our productive environment (PHP 5.4). This seems to be a known PHP bug that should be fixed by now (https://bugs.php.net/bug.php?id=52144), but it still occurs for us. Anyway, we unfortunately don't have time to figure out what's wrong with our PHP configurations etc. We would like to rewrite these two functions without the use of anonymous functions, so that the error doesn't occur anymore. Ordering of a multidimensional array ($array) by value of key "position": usort($array, function($a, $b) { return $a['position'] - $b['position']; }); Ordering of a multidimensional array ($array) according to the order of a second array ($position_order): usort($array, function($a, $b) use($position_order) { return (isset($position_order[$a['ftid']]) ? ($position_order[$a['ftid']] - $position_order[$b['ftid']]) : 1); }); Especially the latter causes some headache, as we don't know how to pass the "outside" array $position_order.

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  • Trouble with creating WPF window extended on the title area (like Office 2007/2010)

    - by Rikker Serg
    I want to make WPF window extended on the title area (like Office 2007/2010). I implemented DwmWindow (see DwmTest.zip) where I put required stuff. Commonly, it works fine except one disgusting thing: the window appears as white rectangle (see DwmIssue.png) and after a few second this rectangle disappears and the content of the window is shown (see DwmIssueCorrect.png). This bug is essential only for my window. If I remove this lines it works fine (without it aero will not showed on title): HwndSource mainWindowSrc = HwndSource.FromHwnd(handle); if (mainWindowSrc != null) mainWindowSrc.CompositionTarget.BackgroundColor = Colors.Transparent; NativeMethods.MARGINS margins = new NativeMethods.MARGINS(0, 50, 0, 0); NativeMethods.DwmExtendFrameIntoClientArea(handle, margins); How can I eliminate this white rectangle? (To run a sample DwmTest.zip WinVista/7 with DWM enabled and .NET 4.0 is required. To compile sample you will need Visual Studio 2010)

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  • Is it a good idea to use a computed column as part of a primary key ?

    - by Brann
    I've got a table defined as : OrderID bigint NOT NULL, IDA varchar(50) NULL, IDB bigint NULL, [ ... 50 other non relevant columns ...] The natural primary key for this table would be (OrderID,IDA,IDB), but this it not possible because IDA and IDB can be null (they can both be null, but they are never both defined at the same time). Right now I've got a unique constraint on those 3 columns. Now, the thing is I need a primary key to enable transactional replication, and I'm faced with two choices : Create an identity column and use it as a primary key Create a non-null computed column C containing either IDA or IDB or '' if both columns were null, and use (OrderID,C) as my primary key. The second alternative seams cleaner as my PK would be meaningful, and is feasible (see msdn link), but since I've never seen this done anywhere, I was wondering if they were some cons to this approach.

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  • Instantiate ItemsPanelTemplate

    - by Stephan
    I'm trying to create a ItemsControl that has a separator between items, for example a control to create a navigation bread crumb. I want the control to be completely generic. My original method was to create extend ItemsControl, add a SeparatorTemplate property, and then have the class add separators to the ItemsHost of the ItemsControl. The problem with this approach is that if you add extra items to the container panel, the ItemGenerator gets confused and the items are out of order and don't get removed correctly. So my second plan was to create a completely new control that would emulate an ItemsControl, but the problem I'm running into is that I can't find a way to instantiate an ItemsPanelTemplate. I would like to provide an ItemsPanel property just like ItemsControl, but I can't then create a panel from that template. Can anyone think of a way to either instantiate an ItemsPanelTemplate or way to add controls to an ItemsControl's panel without breaking the ItemGenerator?

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  • Communicate multiple times with a process without breaking the pipe?

    - by Manux
    Hello, it's not the first time I'm having this problem and its really bugging me. Whenever I open a pipe using the Python subprocess module, I can only communicate with it once, as the documentation specifies: Read data from stdout and stderr, until end-of-file is reached proc = sub.Popen("psql -h darwin -d main_db".split(),stdin=sub.PIPE,stdout=sub.PIPE) print proc.communicate("select a,b,result from experiment_1412;\n")[0] print proc.communicate("select theta,zeta,result from experiment_2099\n")[0] The problem here is that the second time, Python isn't happy. Indeed, he decided to close the file after the first communicate: Traceback (most recent call last): File "a.py", line 30, in <module> print proc.communicate("select theta,zeta,result from experiment_2099\n")[0] File "/usr/lib64/python2.5/subprocess.py", line 667, in communicate return self._communicate(input) File "/usr/lib64/python2.5/subprocess.py", line 1124, in _communicate self.stdin.flush() ValueError: I/O operation on closed file So... multiple communications aren't allowed? I hope not ;) Please enlighten me.

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  • How to use autoconf with C++0x features

    - by themis
    What are the best practices for using autoconf in conjunction with shared_ptr and other TR1/BOOST C++0x templates so as to maximize portability and maintainability? With autoconf I can determine whether shared_ptr is available as std::tr1::shared_ptr and/or boost::shared_ptr. Given that the same feature has two different names, I have the following questions: In the code, how should shared_ptr be referenced? Should std::tr1::shared_ptr be preferred over boost::shared_ptr? For the first, the code is currently using preprocessor conditionals allowing non-qualified references to shared_ptr, a la #if HAVE_STD_TR1_SHARED_PTR using std::tr1::shared_ptr; #elif HAVE_BOOST_SHARED_PTR using boost::shared_ptr; #else #error "No definition for shared_ptr found" #endif Second, the code uses std::tr1:: over boost:: to minimize dependencies on external libraries (even if the the libraries are widely used). Are these two solutions common? Are there better ones?

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  • add several variables to dataframe, based on vector

    - by Andreas
    I am sure this is easy - but I can't figure it out right now. Basically: I have a long vector of variables: names <- c("first","second", "third") I have some data, and I now need to add the variables. I could do: data$first <- NA But since I have a long list, and I would like an automated solution. This doesn't work. for (i in 1:length(names)) (paste("data$", names[i],sep="") <- NA) The reason I want this, is that I need to vertically merge to dataframes, where one doesn't have all the variables it should have. Thanks in advance

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  • Adding a subdomain to my google app engine project?

    - by user246114
    Hi, I created a google app engine project. I just successfully mapped it to a new domain. The name of my project is "grape". So by default, it is published at http://www.grape.appspot.com. I mapped it to http://www.grape.com, which is terrific. Now I'd like to create a new app engine project, and have it mapped to: http://api.grape.com how do I go about doing this? I think it is possible, I'm just not sure where I would do this mapping? Since I own grape.com, I am hoping I can map a new project to t. The basic idea was to have one project which is responsible for the UI stuff, then a second project responsible just for a public api, which would be great, Thanks

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  • Problem in passing arrays from C# to C++

    - by Rakesh K
    Hi, I have an application in which I need to pass an array from C# to a C++ DLL. What is the best method to do it? I did some search on Internet and figured out that I need to pass the arrays from C# using ref. The code for the same: status = IterateCL(ref input, ref output); The input and output arrays are of length 20. and the corresponding code in C++ DLL is IterateCL(int *&inArray, int *&outArray) This works fine for once. But if I try to call the function from C# in a loop the second time, the input array in C# is showing up as an array of one element. Why is this happening and please help me how I can call this function iteratively from C#. Thanks, Rakesh.

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  • Questions regarding PHPUnit mock feature

    - by Andree
    Can someone provide me a reference to a good PHPUnit mock guide? The one in the official documentation doesn't seem to be detailed enough. I need to know about the following: 1) How to expect multiple calls to a mock object's method, but each return a different sets of value? $tableMock->expects($this->exactly(2)) ->method('find') ->will($this->returnValue(2)); // I need the second call to return different value 2) How to expect a call to a mock object's method with multiple parameters?

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  • Proper way to have an endless worker thread?

    - by Neil N
    I have an object that requires a lot of initialization (1-2 seconds on a beefy machine). Though once it is initialized it only takes about 20 miliseconds to do a typical "job" In order to prevent it from being re-initialized every time an app wants to use it (which could be 50 times a second or not at all for minutes in typical usage), I decided to give it a job que, and have it run on its own thread, checking to see if there is any work for it in the que. However I'm not entirely sure how to make a thread that runs indefinetly with or without work. Here's what I have so far, any critique is welcomed private void DoWork() { while (true) { if (JobQue.Count > 0) { // do work on JobQue.Pop() } else { System.Threading.Thread.Sleep(50); } } } After thought: I was thinking I may need to kill this thread gracefully insead of letting it run forever, so I think I will add a Job type that tells the thread to end. Any thoughts on how to end a thread like this also appreciated.

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  • Running rspec against multiple targets

    - by kaerast
    I've written an rspec test using Watir against a web application and it's running fine. However, I now want to be able to run this test against the web application running on different domain names. My initial thought was that I'd be able to pass a value to spec at the command line to set a variable within my script, but I can't see any easy method of doing this. So my second thought was that I might need to add an array of domains into my script and have it test all of them - but I don't always want to test every domain, and the domains are constantly changing as we add and remove sites to be tested. What are my options for allowing the choice of targets I want?

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  • Can you explain this odd behavior with dragging items into nested sortables?

    - by RDL
    I have the following setup: A sortable list where one of the <li> has a table with lists in each cell. All of the lists are sortable with each other. Draggable items that can be added to any of the sortables Issue: When adding a draggable item ('drag 1', 'drag 2', 'drag 3') to one of the lists in the horizontal lists (table of lists) it duplicates the draggable when dropped. Sometimes it will create both copies in the same list or one in the item list and one in the column list. Here is a demo: http://jsfiddle.net/MQTgA/ Question: How do I prevent the second item being created when dropping the draggable?

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  • SlideUp a div if any other div is slided down with jQuery

    - by John
    I have made a function to slidedown different div's by clicking different links. Following is basic code. However, there's a little problem that, for example, if i click on first link, it slides down div. Now If i click on next link, it keeps the first div, and slides down the second div. However I want to do it so that, if there is any div slided down, and I click on any link, it should slide up the previous div and slide down the newer one. I will appriciate your help in this regard. Thanks. $("a.about").click(function(){ $("#about").slideDown("slow"); }); $("a.info").click(function(){ $("#info").slideDown("slow"); }); $("a.contact").click(function(){ $("#contact").slideDown("slow"); });

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  • Caching Web UserControl by Propety is not working (Grr!)

    - by PapillonUK
    Here's my code behind: <PartialCaching(60, Nothing, "UsrCtl_WebUserControl.CacheString", Nothing, True)> _ Partial Class UsrCtl_WebUserControl Inherits System.Web.UI.UserControl Private _CacheString As String Public Property CacheString() As String Get Return _CacheString End Get Set(ByVal value As String) _CacheString = value End Set End Property End Class Here's the user control embedded in a page: <uc:wuc ID="wuc" runat="server" CacheString="A" /> And in another page: <uc:wuc ID="wuc" runat="server" CacheString="B" /> According to the docs this control should maintain a different, 60 second cached version for each value of the CacheString property. It doesn't work - it caches for 60 seconds, but only one cached copy is created regardless of what I put in the CacheString property. Anyone any ideas what i'm doing wrong? - After 4 hours of this I have no hair or nails left - please save my monitor from the brick.

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  • How to turn off Video Acceleration programatically.

    - by Stefan
    Im using the Windows Media Player OCX in a program runned on hundreds of computers (dedicated). I have found out that when video acceleration is turned on to "full", on some computers it will cause the video to fail to play correct, with green squares between movies and so on. Turn the acceleration to "None" and everything is fine. This program is runned on ~800 computers that will autoupdate my program. So I want to add to the startup to my program that it turns off the video acceleration. The question is, how do I turn off video Acceleration Programatically? All computers are running XP and at least the second service pack. It would take me ages to manually logg in to all those computers and change that setting so thats why I want the program to be able to do it automagically for me.

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  • Testing for the existence of a field in a class

    - by Brett
    Hi, i have a quick question. I have a 2D array that stores an instance of a class. The elements of the array are assigned a particular class based on a text file that is read earlier in the program. Since i do not know without looking in the file what class is stored at a particular element i could refer to a field that doesn't exist at that index (referring to appearance when an instance of temp is stored in that index). i have come up with a method of testing this, but it is long winded and requires a second matrix. Is there a function to test for the existence of a field in a class? class temp(): name = "default" class temp1(): appearance = "@"

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  • What's the proper way of importing option lists into an Android app?

    - by Scott
    I have been storing option lists for my Android app in a cloud table. For example, categories like "historical fiction","biography","science fiction", etc. I see the following pros and cons: Pro: I can make changes to the list without sending an app update to Google Play Not normalized - I can use the text in my other data tables instead of a reference ID Con: App needs to take time to download from the web each time (or at least check for changes) English only I believe the "proper" way to do this is the use the XML resource files. But I need to make sure the selection references correctly with my data. That is, my app needs to understand that "Poetry" and "Poesía" are the same thing. Is the correct thing to do: Forget about it since I'll never get to the point where I'm translating my app anyway Use a string-array and use the index (0...x) to know what the selection is Use a 2-dimensional string-array with a reference ID in the first column and the text in the second?

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  • C#: Preferred pattern for functions requiring arguments that implement two interfaces

    - by JS Bangs
    The argument to my function f() must implement two different interfaces that are not related to each other by inheritance, IFoo and IBar. I know of two different ways of doing this. The first is to declare an empty interface that inherits from both: public interface IFooBar : IFoo, IBar { // nothing to see here } public int f(IFooBar arg) { // etc. } This, of course, requires that the classes declare themselves as implementing IFooBar rather than IFoo and IBar separately. The second way is to make f() generic with a constraint: public int f<T>(T arg) where T : IFoo, IBar { // etc. } Which of these do you prefer, and why? Are there any non-obvious advantages or disadvantages to each?

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  • What did I do wrong with this function?

    - by Felipe Galdino Campos
    I don't know what I did - it's wrong . Can someone help me? def insert_sequence(dna1, dna2, number): '''(str, str, int) -> str Return the DNA sequence obtained by inserting the second DNA sequence at the given index. (You can assume that the index is valid.) >>> insert_sequence('CCGG', 'AT', 2) 'CCATGG' >>> insert_sequence('TTGC', 'GG', 2) 'TTGGGC' ''' index = 0 result = ''; for string in dna1: if index == number: result = result + dna2 result = result + string index += 1 print(result)

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  • selecting a range of verses from a database

    - by Noam Smadja
    i have a database, with verses from the bible, with those fields: book (book number), chapter (chapter number), verse (verse number), text (the verse) example: 1 1 1 In the beginning God created the heaven and the earth. first 1 is for Genesis, second 1 is for chapter 1, third 1 is for verse 1 user gives me something like 1 1:1 - 1 1:4 which means he wants to show Genesis 1:1-4. what i want to do is something like SELECT book*100000+chapter*1000+verse AS index FROM bible WHERE index >= 1001001 AND index <=1001004 or WHERE book*100000+chapter*1000+verse >= 1001001 AND book*100000+chapter*1000+verse <= 1001004

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  • Android: heavy traffic on server causes app to force close

    - by user522559
    I have developed an app to communicate with my own server and published it. However, sometimes the app force closes. I know there is no bug in the code because the app works properly most of the time, but sometimes it is waiting for an answer from the server forever. I think this is due to the fact that so many people are using the app, and the app refreshes every 1 second or so, so this heavy traffic causes the server to take a large amount of time to respond. So how do you take care of such a use case? should I have a use case where if the server does not respond after some time you just stop the app and throw a message saying that the server is not responding or something like that?

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