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  • Separate specific #ifdef branches

    - by detly
    In short: I want to generate two different source trees from the current one, based only on one preprocessor macro being defined and another being undefined, with no other changes to the source. If you are interested, here is my story... In the beginning, my code was clean. Then we made a new product, and yea, it was better. But the code saw only the same peripheral devices, so we could keep the same code. Well, almost. There was one little condition that needed to be changed, so I added: #if defined(PRODUCT_A) condition = checkCat(); #elif defined(PRODUCT_B) condition = checkCat() && checkHat(); #endif ...to one and only one source file. In the general all-source-files-include-this header file, I had: #if !(defined(PRODUCT_A)||defined(PRODUCT_B)) #error "Don't make me replace you with a small shell script. RTFM." #endif ...so that people couldn't compile it unless they explicitly defined a product type. All was well. Oh... except that modifications were made, components changed, and since the new hardware worked better we could significantly re-write the control systems. Now when I look upon the face of the code, there are more than 60 separate areas delineated by either: #ifdef PRODUCT_A ... #else ... #endif ...or the same, but for PRODUCT_B. Or even: #if defined(PRODUCT_A) ... #elif defined(PRODUCT_B) ... #endif And of course, sometimes sanity took a longer holiday and: #ifdef PRODUCT_A ... #endif #ifdef PRODUCT_B ... #endif These conditions wrap anywhere from one to two hundred lines (you'd think that the last one could be done by switching header files, but the function names need to be the same). This is insane. I would be better off maintaining two separate product-based branches in the source repo and porting any common changes. I realise this now. Is there something that can generate the two different source trees I need, based only on PRODUCT_A being defined and PRODUCT_B being undefined (and vice-versa), without touching anything else (ie. no header inclusion, no macro expansion, etc)?

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  • loading javascript file after jquery.ready

    - by Spines
    I want to load a javascript file at the end of jquery.ready so that the code in my ready handler doesn't have to wait to execute until this large javascript file is loaded. My jquery.ready code doesn't rely on this javascript file at all. Would this be a good way to do that? $(function(){ ... ... $('head').append('<script type="text/javascript" src="/largejs.js"></script>'); });

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  • jruby hangs on connection to sqlserver

    - by Christopher Dancy
    Jruby is hanging on connection to sqlserver and I cannot figure out why. Here is my code ... puts "make connection" ActiveRecord::Base.establish_connection( :adapter => 'jdbc', :driver => 'com.microsoft.jdbc.sqlserver.SQLServerDriver', :url => 'jdbc:sqlserver://test:1433;databaseName=test;integratedSecurity=true', :username=>'test', :password=>'test' ) puts "connected" fish = ActiveRecord::Base.connection.execute("SELECT * FROM users") puts "query ok" the code spits out "make connection" and then "connected" but never reaches "query ok" any ideas?

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  • window.close() generates problem

    - by dhaliwaljee
    this code generates problem [encountered problem of window] and close all the safari windows, but this code is working fine with Internet Explorer. What will I do ? have any alternative method for closing current opened window in every browser. <input type='button' value='close' onclick='window.close()'>

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  • Why do i get a circular reference exception when calling to_json on an ActiveRecord::Relation

    - by midas06
    In Rails 3 (beta 3 on 1.8.7), when calling to_json on a relation i get a circular reference exception. Converting that relation to an array first, and THEN calling to_json works. Code That fails: Model.where().to_json (Where model is any model in your Rails 3 app) Code that works: Model.where().to_a.to_json This can be reproed on the console. Has anyone else run in to this? Is this expected?

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  • Best IDE macro tools to combat the verbosity of Java syntax for someone with carpal tunnel?

    - by Carlsberg
    I have a bad case of carpal tunnel so I'm looking for an editor that would make my Java programming less painful (literally!). Does anyone have any recommendations for tools that you can add to Eclipse, Netbeans or other IDEs to produce some of the repetitive code that's common in Java syntax? Overall what would be the best code editor for this purpose? (I'm coding on Ubuntu, in case it matters).

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  • loading data from a flat file to table using informatica, having both english and foreign language c

    - by Manish
    I am loading data from a flat file to table using informatica, the file has both english and foreign language characters like chinese, and others. The foreign language characters are not getting displayed properly after loading. How can this problem be solved ? I could solve it by using code page UTF - 16 Encoding of Unicode Platform Endian, earlier i was using different code page UTF-8.

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  • Migrating from hand-written persistence layer to ORM

    - by Sergey Mikhanov
    Hi community, We are currently evaluating options for migrating from hand-written persistence layer to ORM. We have a bunch of legacy persistent objects (~200), that implement simple interface like this: interface JDBC { public long getId(); public void setId(long id); public void retrieve(); public void setDataSource(DataSource ds); } When retrieve() is called, object populates itself by issuing handwritten SQL queries to the connection provided using the ID it received in the setter (this usually is the only parameter to the query). It manages its statements, result sets, etc itself. Some of the objects have special flavors of retrive() method, like retrieveByName(), in this case a different SQL is issued. Queries could be quite complex, we often join several tables to populate the sets representing relations to other objects, sometimes join queries are issued on-demand in the specific getter (lazy loading). So basically, we have implemented most of the ORM's functionality manually. The reason for that was performance. We have very strong requirements for speed, and back in 2005 (when this code was written) performance tests has shown that none of mainstream ORMs were that fast as hand-written SQL. The problems we are facing now that make us think of ORM are: Most of the paths in this code are well-tested and are stable. However, some rarely-used code is prone to result set and connection leaks that are very hard to detect We are currently squeezing some additional performance by adding caching to our persistence layer and it's a huge pain to maintain the cached objects manually in this setup Support of this code when DB schema changes is a big problem. I am looking for an advice on what could be the best alternative for us. As far as I know, ORMs has advanced in last 5 years, so it might be that now there's one that offers an acceptable performance. As I see this issue, we need to address those points: Find some way to reuse at least some of the written SQL to express mappings Have the possibility to issue native SQL queries without the necessity to manually decompose their results (i.e. avoid manual rs.getInt(42) as they are very sensitive to schema changes) Add a non-intrusive caching layer Keep the performance figures. Is there any ORM framework you could recommend with regards to that?

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  • Changing Image In an ImageButton After Being Clicked?

    - by BuZzZzJaY
    Creating a game in Android using multiple ImageButtons to display an image from the drawable folder and I want to change the button to a different image after the button has been clicked on. Here is the code for my image button: <ImageButton android:id="@+id/b56" android:layout_width="45px" android:layout_height="45px" android:layout_gravity="center_vertical" android:src="@drawable/black" /> I can't find anything about how to change the actual image of the button. You can change the color of the button by using the following code in the java file: b32.setBackgroundColor(0xAA00AA00);

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  • Create java sandbox based on security policies

    - by argos
    I need to create environment to run potentially untrusted code. Program allowed to connect to preconfigured address:port and nothing else (even read the system time). I have compiled the class whitelist. I'd searched similar questions, but found only template that based on SecurityManager which AFAIK is deprecated. Can anybody give me a simple sample how to run code in sandbox based on security policies and AccessController?

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  • Multi-Threading Question Concerning WPF

    - by Andrew
    Hello, I'm a newbie to threading, and I don't really know how to code a particular task. I would like to handle a mouse click event on a window that will kick off a while loop in a seperate thread. This thread, which is distinct from the UI thread, should call a function in the while loop which updates a label on the window being serviced by the UI thread. The while loop should stop running when the left mouse button is no longer being pressed. All the loop does is increment a counter, and then repeatedly call the function which displays the updated value in the window. The code for the window and all of the threading is given below (I keep getting some error about STA threading, but don't know where to put the attribute). Also, I'm hoping to use this solution, if it ever works, in another project that makes asynchronous calls elsewhere to a service via wcf, so I was hoping not to make any application-wide special configurations, since I'm really new to multi-threading and am quite worried about breaking other code in a larger program... Here's what I have: <Window x:Class="WpfApplication2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WpfApplication2" Name="MyMainWindow" Title="MainWindow" Width="200" Height="150" PreviewMouseLeftButtonDown="MyMainWindow_PreviewMouseLeftButtonDown"> <Label Height="28" Name="CounterLbl" /> </Window> And here's the code-behind: using System.Windows; using System.Windows.Input; using System.Threading; namespace WpfApplication2 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { private int counter = 0; public MainWindow() { InitializeComponent(); } private delegate void EmptyDelegate(); private void MyMainWindow_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Thread counterThread = new Thread(new ThreadStart(MyThread)); counterThread.Start(); } private void MyThread() { while (Mouse.LeftButton == MouseButtonState.Pressed) { counter++; Dispatcher.Invoke(new EmptyDelegate(UpdateLabelContents), null); } } private void UpdateLabelContents() { CounterLbl.Content = counter.ToString(); } } } Anyways, multi-threading is really new to me, and I don't have any experience implementing it, so any thoughts or suggestions are welcome! Thanks, Andrew

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  • Best pageable table implementation in GWT

    - by Steve Buikhuizen
    I need to add a paging, sortable table to my GWT application. I see lots of these out there so I'm looking for your experience to save me time by choosing the best one. So far I'm looking at... http://code.google.com/p/gwt-advanced-table/ http://code.google.com/p/google-web-toolkit-incubator/wiki/PagingScrollTableOld I like the second one best. Any stories to tell?

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  • decent html5 offline storage and caching examples

    - by Nils
    I'm keen to test out html offline storage and caching with a view to developing a prototype to show off the offline web application capabilities of html5. I've found some webkit-specific samples, but I'm battling to find any decent code samples that even work at all in Firefox 3.6 For a sample, I'd be happy with something that works with the following: Our company uses jquery extensively so I'd prefer samples that use that library or pure javascript. It should at least work on firefox (3.6+ is fine) Can anyone point me to some links that provide some guidance and code samples?

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  • Accessing a database through Obj-c

    - by Ricardo
    Hey, I am trying to find some source code on how to access and store variables from a database to my program via obj-c(iPhone). I have look for many hours now and no one has provided a sure fire way on how to go about this. If you have any advice or recommendations please post some source code or a link to it. Thanks for the help.

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  • Application closes on Nokia E71 when using urllib.urlopen

    - by sammr
    Hello, Im running the following code on my Nokia E71. But after the text input, the program closes abruptly. I have a GPRS connection on my phone,but i still seem to be having some problem with urllib.urlopen The code is as follows : import appuifw,urllib amountInDollars = appuifw.query(u"Enter amount in Dollars","text") data=urllib.urlopen("http://www.google.com").read() appuifw.note(u"Hey","info") Any way to fix this problem ? Thank You

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  • check if directory exists c#

    - by Ant
    I am trying to see if a directory exists based on an input field from the user. When the user types in the path, I want to check if the path actually exists. I have some c# code already. It returns 1 for any local path, but always returns 0 when I am checking a network path. static string checkValidPath(string path) { //Insert your code that runs under the security context of the authenticating user here. using (ImpersonateUser user = new ImpersonateUser(user, "", password)) { //DirectoryInfo d = new DirectoryInfo(quotelessPath); bool doesExist = Directory.Exists(path); //if (d.Exists) if(doesExist) { user.Dispose(); return "1"; } else { user.Dispose(); return "0"; } } } public class ImpersonateUser : IDisposable { [DllImport("advapi32.dll", SetLastError = true)] private static extern bool LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, out IntPtr phToken); [DllImport("kernel32", SetLastError = true)] private static extern bool CloseHandle(IntPtr hObject); private IntPtr userHandle = IntPtr.Zero; private WindowsImpersonationContext impersonationContext; public ImpersonateUser(string user, string domain, string password) { if (!string.IsNullOrEmpty(user)) { // Call LogonUser to get a token for the user bool loggedOn = LogonUser(user, domain, password, 9 /*(int)LogonType.LOGON32_LOGON_NEW_CREDENTIALS*/, 3 /*(int)LogonProvider.LOGON32_PROVIDER_WINNT50*/, out userHandle); if (!loggedOn) throw new Win32Exception(Marshal.GetLastWin32Error()); // Begin impersonating the user impersonationContext = WindowsIdentity.Impersonate(userHandle); } } public void Dispose() { if (userHandle != IntPtr.Zero) CloseHandle(userHandle); if (impersonationContext != null) impersonationContext.Undo(); } } Any help is appreciated. Thanks! EDIT 3: updated code to use BrokenGlass's impersonation functions. However, I need to initialize "password" to something... EDIT 2: I updated the code to try and use impersonation as suggested below. It still fails everytime. I assume I am using impersonation improperly... EDIT: As requested by ChrisF, here is the function that calls the checkValidPath function. Frontend aspx file... $.get('processor.ashx', { a: '7', path: x }, function(o) { alert(o); if (o=="0") { $("#outputPathDivValid").dialog({ title: 'Output Path is not valid! Please enter a path that exists!', width: 500, modal: true, resizable: false, buttons: { 'Close': function() { $(this).dialog('close'); } } }); } }); Backend ashx file... public void ProcessRequest (HttpContext context) { context.Response.Cache.SetExpires(DateTime.Now); string sSid = context.Request["sid"]; switch (context.Request["a"]) {//a bunch of case statements here... case "7": context.Response.Write(checkValidPath(context.Request["path"].ToString())); break;

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  • How can I reduce jQuery?

    - by Tommy
    I'm using just a few basic jQuery functions on my site. How can I remove unused jQuery code? Knowing only the basics, I looked at the code and was not sure where to start. If you could point me in the right direction, that would be appreciated. Thanks.

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  • Language to learn metaprogramming

    - by Erup
    What's the best language (in terms of simplicity, readability and code elegancy) in your opinion, to learn and work with metaprogramming? I think metaprogramming is the "future of coding". Not saying that code will extinct, but we can see this scenario coming on new technologies.

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  • Myself throwing NullReferenceException... needs help

    - by Amit Ranjan
    I know it might be a weird question and its Title too, but i need your help. I am a .net dev , working on platform for the last 1.5 years. I am bit confused on the term usually we say " A Good Programmer ". I dont know ,what are the qualities of a good programmer ? Is the guy who writes a bug free code? or Can develop applications solely? or blah blah blah...lots of points. I dont know... But as far i am concerned , I know I am not a good programmer, still in learning phase an needs a lot to learn in coming days. So you guys are requested to please help me with this two problems of mine My first problem is regarding the proper Error Handling, which is a most debatable aspect of programming. We all know we use ` try { } catch { } finally { } ` in our code to manage exception. But even if I use try { } catch(exception ex) { throw ex } finally { } , different guys have different views. I still dont know the good way to handle errors. I can write code, use try-catch but still i feel I lacks something. When I saw the codes generated by .net fx tools even they uses throw ex or `throw new Exception("this is my exception")`.. I am just wondering what will be the best way to achieve the above. All means the same thing but why we avoid something. If it has some demerits then it must be made obselete.Anyways I still dont have one [how to handle errors efficiently?]. I generally follow the try-catch(execoption ex){throw ex}, and usually got stucked in debates with leads why you follow this why not that... 2.Converting your entire code blocks in modules using Design patterns of some OOPs concepts. How do you guys decide what architeture or pattern will be the best for my upcoming application based on its working, flow etc. I need to know what you guys can see that I can't. Since I know , I dont have that much experience but I can say, with my experience that experience doesnot comes either from degree/certificates or success you made instead it cames from failures you faced or got stucking situations. Pleas help me out.

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  • In VB 6 debug mode, problem with dll

    - by stan
    my vb6 app is not finding a dll that is residing in the same directory as the project. What do I do to have the vb6 code see the dll? When compiled to an exe, the code sees the dll if it is in the same dir as the exe. Thanks!

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  • Cannot debug when logged in as a user other than the administrator

    - by Mina Samy
    Hi all I have acustom sharepoint page. on my machine I can debug the code normaly by attaching to the w3p process when I'm logged in as the administrator user. when I log in with another user and try to debug I always get access denied page in the sharepoint and the dubug exists. is there a way to debug the code while logged in with another user thanks

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