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• How do I get a value of a reference type in an Expression?

  - by Jon Kruger

  I have this method: public void DoSomething<T>(Expression<Func<T, object>> method) { } If this method is called like this: DoSomething(c => c.SomeMethod(new TestObject())); ... how do I get the value of the parameter that was passed into SomeMethod()? If the parameter is a value type, this works: var methodCall = (MethodCallExpression)method.Body; var parameterValue = ((ConstantExpression)methodCall.Arguments[0]).Value; However, when I pass in a reference type, methodCall.Arguments[0] is a MemberExpression, and I can't seem to figure out how to write code to get the value out of it.

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• [Cocoa] NSTask string encoding problem

  - by ryyst

  Hi, In my program, I'm grep-ing via NSTask. For some reason, sometimes I would get no results (even though the code was apparently the same as the command run from the CLI which worked just fine), so I checked through my code and found, in Apple's documentation, that when adding arguments to an NSTask object, "the NSTask object converts both path and the strings in arguments to appropriate C-style strings (using fileSystemRepresentation) before passing them to the task via argv[]" (snip). The problem is that I might grep terms like "Río Gallegos". Sadly (as I checked with fileSystemRepresentation), that undergoes the conversion and turns out to be "RiÃÅo Gallegos". How can I solve this? -- Ry

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• Ubuntu One Folder Sync Filter

  - by Andy Barlow

  Hi, I am trying to modify the Ubuntu One File syncing python scripts to not including things like .iso's. I have got as far as finding this file: /usr/share/pyshared/ubuntuone/u1sync/constants.py Inside is this piece of code: import re # the name of the directory u1sync uses to keep metadata about a mirror METADATA_DIR_NAME = u".ubuntuone-sync" # filenames to ignore SPECIAL_FILE_RE = re.compile(".*\\.(" "(u1)?partial|part|" "(u1)?conflict(\\.[0-9]+)?)$") How can I edit this last section (regex?) and make it ignore .iso files??? I'm fairly sure this is the place to put it! Pretty sure this is standard python action :) Any help would be appreciated. Thanks kindly. Andy

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• Using 'load' in octave

  - by lollygagger

  Is there a way to tell the load function to only load until a certain line? I want to read in a data file and assign the numbers to an array, however, I want it to stop after it has created a 200 X 200. Could I also do this with a do-while loop and fgetl? When I try to use fgetl(fid, len) and give it 'len', it does not obey :-/ How can I tell octave to ignore the comment lines in an input file? They are '#' characters, so I figured octave would just automatically ignore them, but not so... Thanks.

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• How come string.maketrans does not work in Python 3.1?

  - by ShaChris23

  I'm a Python newbie. How come this doesn't work in Python 3.1? from string import maketrans # Required to call maketrans function. intab = "aeiou" outtab = "12345" trantab = maketrans(intab, outtab) str = "this is string example....wow!!!"; print str.translate(trantab); When I executed the above code, I get the following instead: Traceback (most recent call last): File "<pyshell#119>", line 1, in <module> transtab = maketrans(intab, outtab) File "/Library/Frameworks/Python.framework/Versions/3.1/lib/python3.1/string.py", line 60, in maketrans raise TypeError("maketrans arguments must be bytes objects") TypeError: maketrans arguments must be bytes objects What does "must be bytes objects" mean? Could anyone please help post a working code for Python 3.1 if it's possible?

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• Java service wrapper and additional application command line parameters

  - by Jake

  I'm currently using java service wrapper to wrap a java application that I've developed. I'm needing to ability to pass in additional command line parameters to my application through the java service wrapper. Pretend my app is called myapp and I've setup java service wrapper so that the script I run to start is called myapp. I'd like to be able to do something like this: ./myapp start Parameter1 parameter2 and have those additional parameters get passed into my application. Any ideas how to do this? I'm finding that googling and looking at the documentation is only pulling up how to use command line arguments to setup java service wrapper. I've had difficulty finding anything about passing command line arguments to your application except for having them hard coded in your wrapper.conf file. Right now I feel like my option is to take the additional command line parameters, set them to environment variables and have those hard coded in the wrapper.conf. I'd prefer not to go down that road though and am hoping I've overlooked something.

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• Is it possible to utilize internal methods on controllers to reduce duplication?

  - by Maslow

  in a partial view I have the following: <%Html.RenderAction(MVC.User.GetComments(Model.UserGroupName)); %> can I render a Controller's PartialViewResult in a View without going through routing so I can pass arguments directly from the model so that the arguments I'm passing to the controller never get sent to the user or seen by the user? Currently the method I'm showing at the top throws an exception because no overload is public. I've got it marked as internal so that a user can not access it, only the rendering engine was my intent.

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• What can explain std::cout not to display anything ?

  - by Benoît

  For whatever reason, std::cout does not display anything with my application. The description of my development environment follows. I am working on a Qt application using Qt Creator. Since Qt Creator can't be launched from my station (XP64), i am currently developping it with Visual Studio 2008 and the Qt plugin (by importing the .pro project file). Everything seems fine and the application works. In some cases (depending on command line arguments), i don't want to launch the HIM, just to display a few sentences in the CLI (command line required arguments, for instance). I don't get any error, but nothing is displayed. The corresponding code, which i am sure is run is the (classical) following : std::cout << "is this going to be displayed ?" << std::endl; Do you have any idea why nothing is displayed ?

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• How to export scrubyt extractor?

  - by robintw

  I've written a scrubyt extractor based on the 'learning' technique - that is, specifying the current text on the page and getting it to work out the XPath expressions itself. However, I now want to export the extractor so that it can be used even when the page has changed. The documentation for scrubyt seems to be all over the place now, but from what I can find I should be able to put the line extractor.export(__FILE__) and it should work. It doesn't - I just get an error saying that there is the wrong number of arguments for export, it should have 0. I've tried it without any arguments and it still fails. I would ask on the scrubyt forum, but it seems like no-one's been there for ages! Any ideas what to do here?

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• Frustration with generics

  - by sbi

  I have a bunch of functions which are currently overloaded to operate on int and string: bool foo(int); bool foo(string); bool bar(int); bool bar(string); void baz(int p); void baz(string p); I then have a bunch of functions taking 1, 2, 3, or 4 arguments of either int or string, which call the aforementioned functions: void g(int p1) { if(foo(p1)) baz(p1); } void g(string p1) { if(foo(p1)) baz(p1); } void g(int p2, int p2) { if(foo(p1)) baz(p1); if(bar(p2)) baz(p2); } void g(int p2, string p2) { if(foo(p1)) baz(p1); if(bar(p2)) baz(p2); } void g(string p2, int p2) { if(foo(p1)) baz(p1); if(bar(p2)) baz(p2); } void g(string p2, string p2) { if(foo(p1)) baz(p1); if(bar(p2)) baz(p2); } // etc. (The implementation of the g() family is just a placeholder. actually they are more complicated.) More types than the current int or string might have to be introduced at any time. The same goes for functions with more arguments than 4. The current number of identical functions is barely manageable. Add one more variant in either dimension and the combinatoric explosion will be so huge, it might blow away the application. In C++, I'd templatize g() and be done. I understand that .NET generics are different. <sigh> But I have been fighting them for two hours trying to come up with a solution that doesn't involve too much copy&paste of code. To no avail. Surely, C#/.NET/generics/whatever won't require me to type out identical code for a family of functions taking five arguments of either of three types? So what am I missing here?

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• C++: How to build an events / messaging system without void pointers?

  - by Jarx

  I'd like to have a dynamic messaging system in my C++ project, one where there is a fixed list of existing events, events can be triggered anywhere during runtime, and where you can subscribe callback functions to certain events. There should be an option for arguments passed around in those events. For example, one event might not need any arguments (EVENT_EXIT), and some may need multiple ones (EVENT_PLAYER_CHAT: Player object pointer, String with message) The first option for making this possible is allowing to pass a void pointer as argument to the event manager when triggering an event, and receiving it in the callback function. Although: I was told that void pointers are unsafe and I shouldn't use them. How can I keep (semi) dynamic argument types and counts for my events whilst not using void pointers?

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• Packaging LAME.exe with a C# project

  - by user347821

  Please forgive my noob-ness on this, but how do I package LAME.exe w/ a C# setup project? Currently, I have LAME being called like: //use stringbuilder to create arguments var psinfo = new ProcessStartInfo( @"lame.exe") { Arguments = sb.ToString(), WorkingDirectory = Application.StartupPath, WindowStyle = ProcessWindowStyle.Hidden }; var p = Process.Start( psinfo ); p.WaitForExit(); This works in debug and release modes on the development machine, but when I create a setup project for this, it never creates the MP3. LAME and the compiled code reside in the same directory when installed. Help!

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• Can't use ProcessWindowStyle.Minimized to start Firefox instance minimized?

  - by Rob3C

  I'm having trouble using Process.Start with Firefox. I want to start a new instance of Firefox in a minimized window. The following works fine with Internet Explorer, notepad, etc.: ProcessStartInfo p = new ProcessStartInfo(); p.FileName = "iexplore.exe"; p.Arguments = "http://www.google.com"; p.WindowStyle = ProcessWindowStyle.Minimized; Process.Start(p); This opens IE in a new, minimized window. Good, just what I want. If I try the exact same thing but instead supply Firefox in the p.FileName, it opens Firefox in a "normal" window, rather than minimized. I've tried various changes to arguments, also have tried examining my local Firefox settings (under Tools/Options) with no luck. I'm sure I'm just missing something simple, but can't figure out what it is. If anyone can help me with getting Firefox opened in a minimized state it would be greatly appreciated!

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• draw an arc given 3 points in SWT

  - by Ahmed Kotb

  iam using the swt java library and iam having a problem. the gc draw arc method takes the following arguments GC.drawArc(int x, int y, int width, int height, int startAngle, int endAngle); but i want to be able to draw the arc using 3 arguments : the source ,destination and control points. is there any formula to convert between those parameters ? QuadCurve2D class do exactly what i want but it is not AWT not swt ...and i tried to use java2d under swt but it was very slow .... any solutions ?

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• Mac OS date command - getting higher temporal resolution

  - by Mark

  Hey all, I am trying to use the date command in Terminal on multiple Mac OS X machines that are synced via NTP to synchronize some code in a program. Essentially I am running a program... MyProgram with arguments[date] I can get date to give me the seconds since the Unix epoch with the %M specifier. When I try to use %N to get nanosecond resolution, date just returns N. Is there anyway to get date to give me finer then second resolution? I wouldn't even mind passing two arguments such as (date +%M):arg2 And then converting units in the program. Many thanks in advance! %N specifier listed here: http://en.wikipedia.org/wiki/Date_(Unix)

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• (Error) GlassFish: publishModule kind= 3 deltaKind=2 1 WebApp

  - by Harry Pham

  I run Eclipse 1.6.0, and Glassfish V3 back end. The program run fine, the console give no error. However the error log always show this weird error. The application name is WebApp GlassFish: publishModule kind= 3 deltaKind=2 1 WebApp An exception stack trace is not available. Here is the Session Data eclipse.buildId=unknown java.version=1.6.0_17 java.vendor=Apple Inc. BootLoader constants: OS=macosx, ARCH=x86, WS=cocoa, NL=en_US Framework arguments: -product org.eclipse.epp.package.jee.product -keyring /Users/KingdomHeart/.eclipse_keyring -showlocation Command-line arguments: -os macosx -ws cocoa -arch x86 -product org.eclipse.epp.package.jee.product -keyring /Users/KingdomHeart/.eclipse_keyring -showlocation

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• TypeError: unbound method make_request() must be called with XX instance, but how?

  - by Dave

  Running the code below I get E TypeError: unbound method make_request() must be called with A instance as first argument (got str instance instead) I dont want to set make_request method as static, I want to call it from an instance of an object. The example http://pytest.org/latest/fixture.html#fixture-function # content of ./test_smtpsimple.py import pytest @pytest.fixture def smtp(): import smtplib return smtplib.SMTP("merlinux.eu") def test_ehlo(smtp): response, msg = smtp.ehlo() assert response == 250 assert "merlinux" in msg assert 0 # for demo purposes My code """ """ import pytest class A(object): """ """ def __init__(self, name ): """ """ self._prop1 = [name] @property def prop1(self): return self._prop1 @prop1.setter def prop1(self, arguments): self._prop1 = arguments def make_request(self, sex): return 'result' def __call__(self): return self @pytest.fixture() def myfixture(): """ """ A('BigDave') return A def test_validateA(myfixture): result = myfixture.make_request('male') assert result =='result'

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• ASP.NET CustomValidator trying to match to System.EventHandler?

  - by annakata

  I have markup so: <asp:TextBox runat="server" ID="Accountname" /> <asp:CustomValidator runat="server" ControlToValidate="Accountname" OnServerValidate="Accountname_CheckUnique" meta:resourcekey="ACCOUNTNAME_UNAVAILABLE" /> Codebehind so: protected void Accountname_CheckUnique(object source, ServerValidateEventArgs arguments) { arguments.IsValid = Foo(); } Which was working just fine, and then without changing anything on the page ASP now insists: No overload for 'Accountname_CheckUnique' matches delegate 'System.EventHandler' Well no, and nor should it according to MSDN. It's late and I'm tired, anybody know how to fix this or point out the glaring flaw in my comprehension?

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• Need help regarding Async and fsi

  - by Stringer Bell

  I'd like to write some code that runs a sequence of F# scripts (.fsx). The thing is that I could have literally hundreds of scripts and if I do that: let shellExecute program args = let startInfo = new ProcessStartInfo() do startInfo.FileName <- program do startInfo.Arguments <- args do startInfo.UseShellExecute <- true do startInfo.WindowStyle <- ProcessWindowStyle.Hidden //do printfn "%s" startInfo.Arguments let proc = Process.Start(startInfo) () scripts |> Seq.iter (shellExecute "fsi") it could stress too much my 2GB system. Anyway, I'd like to run scripts by batch of n, which seems also a good exercise for learning Async (I guess it's the way to go). I have written some code and unfortunately it doesn't work: open System.Diagnostics let p = shellExecute "fsi" @"C:\Users\Stringer\foo.fsx" async { let! exit = Async.AwaitEvent p.Exited do printfn "process has exited" } |> Async.StartImmediate foo.fsx is just a hello world script. I'd like also to figure out if it's doable to retrieve a return code for each executing script and if not, find another way. Thanks!

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• LINQ DefaultIfEmpty(), generating inferred argument error

  - by Refracted Paladin

  I am trying to get the below linq query to return -1 if there isn't any current value. I was looking at this article on MSDN, here, and it seemed that DefaultIfEmpty() was what I wanted. Unfortunately, I am getting a The type arguments cannot be inferred from the usage. Try specifying the type arguments explicitly. error. I guess I am not sure what that means or what it is telling me to do. Can someone explain, please. public static int CheckForDRIID(int personID) { using (var context = ConnectDataContext.Create()) { var masterIndex = (from applicationAssociation in context.tblApplicationAssociations where applicationAssociation.ApplicationID == 1 && applicationAssociation.PersonID == personID select applicationAssociation.PersonApplicationID).DefaultIfEmpty(-1).Single(); return Convert.ToInt32(masterIndex); } }

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• PhoneGap's vibrate() and beep() functions break in iPhone, Android emulators

  - by Steve Nay

  I have a PhoneGap app that I'm testing on webOS, Android, and iPhone. I'm using physical devices as well as emulators (the ones that come with their respective SDKs, not the PhoneGap emulator). Part of the code uses the navigator.notification.vibrate() and navigator.notification.beep() functions. All the physical devices I'm using either perform the behavior or ignore it if they're not capable (e.g., the iPod can't vibrate). However, the emulators behave differently. The Android emulator kills the app whenever the beep() function is called. The iPhone emulator causes the app to hang whenever the vibrate() function is called. Is there any way to get the emulators to ignore those function calls when they are unable to execute them? That is, is there a way to get them to degrade gracefully so I can test the app both places without having to modify the code specifically for the emulators?

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• MySQL: updating a row and deleting the original in case it becomes a duplicate

  - by Silvio Donnini

  I have a simple table made up of two columns: col_A and col_B. The primary key is defined over both. I need to update some rows and assign to col_A values that may generate duplicates, for example: UPDATE `table` SET `col_A` = 66 WHERE `col_B` = 70 This statement sometimes yields a duplicate key error. I don't want to simply ignore the error with UPDATE IGNORE, because then the rows that generate the error would remain unchanged. Instead, I want them to be deleted when they would conflict with another row after they have been updated I'd like to write something like: UPDATE `table` SET `col_A` = 66 WHERE `col_B` = 70 ON DUPLICATE KEY REPLACE which unfortunately isn't legal in SQL, so I need help finding another way around. Also, I'm using PHP and could consider a hybrid solution (i.e. part query part php code), but keep in mind that I have to perform this updating operation many millions of times. thanks for your attention, Silvio Reminder: UPDATE's syntax has problems with joins with the same table that is being updated

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• How can I make XOR work for logical matrix in MATLAB?

  - by Runner

  >> XOR(X,X) ??? Undefined function or method 'XOR' for input arguments of type 'logical'. Why XOR can't be used for logical matrix? And I tried a more simple example: >> A=[1 0;1 0]; >> B=[1 1;0 0]; >> XOR(A,B) ??? Undefined function or method 'XOR' for input arguments of type 'double'. How can I properly use XOR?

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• Is this a well known design pattern? what is it's name

  - by GenEric35

  Hi I have seen this often in code, but when I speak of it i don't know the name of such 'pattern' I have a method with 2 arguments that calls an overloaded method that has 3 arguments and intentionality sets the 3rd one to empty string. public DoWork(string name, string phoneNumber) { CreateContact(name, phoneNumber, string.Empty) } public DoWork(string name, string phoneNumber, string emailAddress) { //do the work } The reason I'm doing this is I to not duplicate code, and allow the existing callers to still call the method that has only 2 parameters. I have associate a few tags to this question, but it probably fit in more categories of questions. Is this a pattern, and does it have a name?

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• Shutting down a WPF application from App.xaml.cs

  - by Johannes Rössel

  I am currently writing a WPF application which does command-line argument handling in App.xaml.cs (which is necessary because the Startup event seems to be the recommended way of getting at those arguments). Based on the arguments I want to exit the program at that point already which, as far as I know, should be done in WPF with Application.Current.Shutdown() or in this case (as I am in the current application object) probably also just this.Shutdown(). The only problem is that this doesn't seem to work right. I've stepped through with the debugger and code after the Shutdown() line still gets executed which leads to errors afterwards in the method, since I expected the application not to live that long. Also the main window (declared in the StartupUri attribute in XAML) still gets loaded. I've checked the documentation of that method and found nothing in the remarks that tell me that I shouldn't use it during Application.Startup or Application at all. So, what is the right way to exit the program at that point, i. e. the Startup event handler in an Application object?

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