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• Reinstalling Debian Package -manager?

  - by hhh

  I have had this problem for too long time: package-manager not working or very unstable, examples here. Now suppose my laptop has very little precious stuff. Is there some easy way to reinstall Debian -package-manager? I don't really have time to fix this problem so I am considering reinstallation of the OS, I have no idea what is causing this repetitive errors with the installers such as aptitude, pip and apt-get. How can I reinstall the package-managers? Perhaps related rebuilding packages and the package manager on debian

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• Why doesn't infinite recursion hit a stack overflow exception in F#?

  - by Amazingant

  I know this is somewhat the reverse of the issue people are having when they ask about a stack overflow issue, but if I create a function and call it as follows, I never receive any errors, and the application simply grinds up a core of my CPU until I force-quit it: let rec recursionTest x = recursionTest x recursionTest 1 Of course I can change this out so it actually does something like this: let rec recursionTest (x: uint64) = recursionTest (x + 1UL) recursionTest 0UL This way I can occasionally put a breakpoint in my code and see the value of x is going up rather quickly, but it still doesn't complain. Does F# not mind infinite recursion?

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• Why does concatenating strings in the argument of EXEC sometimes cause a syntax error in T-SQL?

  - by Tim Goodman

  In MS SQL Server Management Studio 2005, running this code EXEC('SELECT * FROM employees WHERE employeeID = ' + CAST(3 AS VARCHAR)) gives this error: Incorrect syntax near 'CAST' However, if I do this, it works: DECLARE @temp VARCHAR(4000) SET @temp = 'SELECT * FROM employees WHERE employeeID = ' + CAST(3 AS VARCHAR) EXEC(@temp) I found an explanation here: http://stackoverflow.com/questions/1044831/t-sql-cannot-pass-concatenated-string-as-argument-to-stored-procedure According to the accepted answer, EXEC can take a local variable or a value as its argument, but not an expression. However, if that's the case, why does this work: DECLARE @temp VARCHAR(4000) SET @temp = CAST(3 AS VARCHAR) EXEC('SELECT * FROM employees WHERE employeeID = ' + @temp) 'SELECT * FROM employees WHERE employeeID = ' + @temp sure looks like an expression to me, but the code executes with no errors.

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• Can't load AMD 64-bit .dll on a IA 32-bit platform

  - by Guihua

  I download the Gurobi package for linear programming. I import the corresponding gurobi.jar package. Then run the example program. Then it appears the following errors: Exception in thread "main" java.lang.UnsatisfiedLinkError: C:\gurobi460\win64\win64\bin\GurobiJni46.dll: Can't load AMD 64-bit .dll on a IA 32-bit platform Then I downloaded the window 64 bit Jre, and use the "window--preference--Installed JRE" to install this new JRE. However, it still appeared this error. Could you help me? Thank you !

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• Python metaprogramming help

  - by Timmy

  im looking into mongoengine, and i wanted to make a class an "EmbeddedDocument" dynamically, so i do this def custom(cls): cls = type( cls.__name__, (EmbeddedDocument,), cls.__dict__.copy() ) cls.a = FloatField(required=True) cls.b = FloatField(required=True) return cls A = custom( A ) and tried it on some classes, but its not doing some of the base class's init or sumthing in BaseDocument def __init__(self, **values): self._data = {} # Assign initial values to instance for attr_name, attr_value in self._fields.items(): if attr_name in values: setattr(self, attr_name, values.pop(attr_name)) else: # Use default value if present value = getattr(self, attr_name, None) setattr(self, attr_name, value) but this never gets used, thus never setting ._data, and giving me errors. how do i do this?

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• Validate Form with PHP AND Javascriipt?

  - by J M 4

  Is it possible to validate a form with PHP AND Javascript? I am currently able to do both using my existing form but only on an individual basis. My overall goal is this: Validate form using javascript client side and present any errors to the user immediately If javascript validation passes, a flag is created and then the PHP script can begin. When doing my javascript validation, i use the following code within the form tag: <form id="Enroll_Form" action="review.php" method="post" name="Enroll_Form" onsubmit="return Enroll_Form_Validator(this)" language="javascript"> if I want to process the PHP validation, I am forced to rename the action to the PHP_SELF file (or simply the same file name i'm using) and remove the 'onsubmit' function. Any ideas?

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• Visual Studio 2008 compiles anything in C++ file?

  - by Brad Pepers

  I noticed today that a source code file in a project was compiling even though it had junk at the top of it. It got me wondering what all would pass without error through the compiler. Here is an example of code that will not generate any error messages: what kind of weird behaviour is this??? #include "stdafx.h" // what is up? int foo(int bar) { bla bla bla????? return bar; } and more junk??? What in the world is the compiler doing to allow this code to compile without giving any error messages? I'm using Visual Studio 2008 and this is unmanaged C++ code. The foo function isn't actually generated in the object file so it can't be used but why no errors???

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• how to show the right word in my code, my code is : os.urandom(64)

  - by zjm1126

  My code is: print os.urandom(64) which outputs: > "D:\Python25\pythonw.exe" "D:\zjm_code\a.py" \xd0\xc8=<\xdbD' \xdf\xf0\xb3>\xfc\xf2\x99\x93 =S\xb2\xcd'\xdbD\x8d\xd0\\xbc{&YkD[\xdd\x8b\xbd\x82\x9e\xad\xd5\x90\x90\xdcD9\xbf9.\xeb\x9b>\xef#n\x84 which isn't readable, so I tried this: print os.urandom(64).decode("utf-8") but then I get: > "D:\Python25\pythonw.exe" "D:\zjm_code\a.py" Traceback (most recent call last): File "D:\zjm_code\a.py", line 17, in <module> print os.urandom(64).decode("utf-8") File "D:\Python25\lib\encodings\utf_8.py", line 16, in decode return codecs.utf_8_decode(input, errors, True) UnicodeDecodeError: 'utf8' codec can't decode bytes in position 0-3: invalid data What should I do to get human-readable output?

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• How to display a confirmation message in Tapestry5?

  - by shane87

  I am developing a website as part of my final year project and I want to display a message which confirms that an email has been sent. I know how to display custom error messages on a form i.e. You cannot go any further until the following errors are fixed : login name not known! I want to display a message which will say: your email has been sent! after I send an email. I have been told that I should display this message through the flash. I am unsure on how to do this, any help would be greatly appreciated.

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• How do I link a VS2008 C++ project as a DLL instead of a LIB?

  - by Clark Battle

  I have the C++ source code in a Visual Studio project from another developer that compiles into a static lib. I need to change it so that it builds a dll from that code so that I can call it from C#. I went into the project properties in Visual Studio and changed the configuration type to a DLL. However, it now gives lots of linker errors like: error LNK2001: unresolved external symbol __CAP_Enter_Function XXXFilter.obj XXXFramework What else do I need to do in Visual Studio and in the code to produce a dll from the code instead of a lib? The library is huge so writing a wrapper is not an option. I have the code so I should be able to make it build a dll. I am not a very experienced C++ dev but I am in C# and visual studio. Thanks

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• How to access data using VBSCRIPT from a stored procedure which contains values in Temp table ?

  - by Srivigneshwar

  Hi , for testing purpose I wrote a VBscript which will fetch values from Sybase by executing a stored procedure which contains values in temp table. When I run the script I get the following errors , "Either BOF or EOF is True, or the current record has been deleted. Requested operation requires a current record." or "Item cannot be found in the collection corresponding to the requested name or ordinal." Somewhere when I was googling I found that , the above error message will be shown when we use temp table in stored procedure, if that is the reason , then how can I access data via VBscript by executing the stored procedure ??

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• Build Path issue with Java Android project when starting Eclipse

  - by Matt Smith

  I booted up eclipse to start on a project, and without typing in a word I already have several errors. package department.namespace; import android.app.Activity; import android.os.Bundle; public class DepartmentActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } At package department.namespace, it says: multiple marks at this line and the type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files The import android.os cannot be resolved. Override cannot be resolved as a type The method OnCreate(Bundle) is undefined for the type Activity R. cannot be resolved as a variable. Since this JUST came up when I started Eclipse, how do I fix this?

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• Bash scripting - Iterating through "variable" variable names for a list of associative arrays

  - by user1550254

  I've got a variable list of associative arrays that I want to iterate through and retrieve their key/value pairs. I iterate through a single associative array by listing all its keys and getting the values, ie. for key in "${!queue1[@]}" do echo "key : $key" echo "value : ${queue1[$key]}" done The tricky part is that the names of the associative arrays are variable variables, e.g. given count = 5, the associative arrays would be named queue1, queue2, queue3, queue4, queue5. I'm trying to replace the sequence above based on a count, but so far every combination of parentheses and eval has not yielded much more then bad substitution errors. e.g below: for count in {1,2,3,4,5} do for key in "${!queue${count}[@]}" do echo "key : $key" echo "value : ${queue${count}[$key]}" done done Help would be very much appreciated!

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• How do I programmatically add an Android Gestures view to a custom view?

  - by user351201

  I have a custom view that works fine and I'm trying to get gestures into it. The most common technique I see is to add XML, such as this (from Android docs: My view is within a RelativeView and when I attempt to reference this GetureOverlayView, I get an exception. I've also tried to connect within my existing custom view class, like this: mGestures = new GestureOverlayView(context, attrs); mGestures.addOnGesturePerformedListener(this); But the callback is never invoked. Can someone see my errors or suggest a better way that will allow me to get gesture callbacks?

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• C: Pointers to any type?

  - by dragme

  I hear that C isn't so type-safe and I think that I could use that as an advantage for my current project. I'm designing an interpreter with the goal for the VM to be extremely fast, much faster than Ruby and Python, for example. Now I know that premature optimization "is the root of all evil" but this is rather a conceptual problem. I have to use some sort of struct to represent all values in my language (from number over string to list and map) Would the following be possible? struct Value { ValueType type; void* value; } I would store the actual values elsewhere, e.g: a separate array for strings and integers, value* would then point to some member in this table. I would always know the type of the value via the type variable, so there wouldn't be any problems with type errors. Now: Is this even possible in terms of syntax and typing?

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

  - by Adim

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

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• two HashMap iteration

  - by user431276

  I have two HashMaps and I can iterate both hashmaps with following code Iterator it = mp.entrySet().iterator(); while (it.hasNext()) { Map.Entry pairs = (Map.Entry)it.next(); String firstVal = pairs.getValue(); } Iterator it2 = mp2.entrySet().iterator(); while (it2.hasNext()) { Map.Entry pairs2 = (Map.Entry)it.next(); String SecondVal = pairs2.getValue(); } myFunction(firstVal, SecondVal) Is there anyway to iterate two hashmaps at the same time without using two loops? Currently, I have a method that accepts two parameters and each parameter value is stored in first and second hashmap. I have to iterate first hash then second to get values. I think there must be a good way to do it but I don't know :( P.S: there could be some errors in above code as this is just an example to explain my problem. Each iterator is a method in original program and accept one parameter. I couldn't copy past real time functions as they are HUGE !

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• SQL Script to clear database tables.

  - by pencilslate

  I have a need to take backup of a SQL Server Db with tons of data in it and import into another environment for updating and testing. Since, i am not interested in the data, i just want to recreate the schema on my other server. There is an option called 'Generate Script', but is throwing errors running them on the target server. Curious, if anyone attempted to write a SQL script that would run through all the tables in the db and clear the rows, thereby i could just create the schema backup as .bak file and restore it into another server.

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• How to change FPU context in signal handler (C++/Linux)

  - by Henry Fané

  I wrote a signal handler to catch FPE errors. I need to continue execution even if this happens. I receive a ucontext_t as parameter, I can change the bad operand from 0 to another value but the FPU context is still bad and I run into an infinite loop ? Does someone already manupulate the ucontext_t structure on Linux ? I finally found a way to handle these situations by clearing the status flag of ucontext_t like this: ... const long int cFPUStatusFlag = 0x3F; aContext->uc_mcontext.fpregs->sw &= ~cFPUStatusFlag; ... 0x3F is negated to put 0 in the 6 bits of the status register of the FPU (x87). Doing this implies to check for FPE exceptions after calculation.

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• Where are the readonly/const in .NET?

  - by acidzombie24

  In C++ you'll see void func(const T& t) everywhere. However, i havent seen anything similar in .NET. Why? I have notice a nice amount of parameters using struct. But i see no functions with readonly/const. In fact now that i tried it i couldnt use those keywords to make a function that promises to not modify a list being passed in. Is there no way to promise the caller that this function will never modify the contents of list? Is there no way to say to call code and say this list should never be modified? (I know i can clone the list or look at documentation but i like compile errors sometime)

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• Package <blah> does not exist error - NetBeans 6.8 & Windows 7

  - by BenMc

  I'm using NetBeans 6.8 on Windows 7. I upgraded from WinXP and NetBeans 6.7. Now my existing java web app project is no longer able to import/find the packages I've developed - I receive a 'Package ,blah. does not exist' and yet the packages do exist, worked fine in NetBeans 6.7 and the project still compiles and runs OK. I've tried changing the Java Platform/JDK from 1.6.0_10 back to JDK 1.5.0_22 but I still receive errors package does not exist. All other 'standard' libraries and packages are able to be imported and used OK ... eg Struts, Hibernate

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

  - by Jimmy

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

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• How do I get this div tag using selenium webdriver?

  - by user1603518

  <div id="ctl00_ContentHolder_vs_ValidationSummary" class="errorblock"> <p><strong>The following errors were found:</strong></p> <ul><input type="hidden" Name="SummaryErrorCmsIds" Value="E024|E012|E014" /> <li>Please select a title.</li> <li>Please key in your first name.</li> <li>Please key in your last name.</li> </ul> </div> I want to capture the text having value of E024 E012 and E014 and write it in to an Excel file. I tried the following but it doesn't work. string val1 = driver.FindElement(By.XPath("//div[contains(@class, 'errorblock'/ value = 'E024|E012|E014'")).Text; How can I do this?

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• Simple Hide/Expand with Javascript

  - by user478419

  I have created a simple expand/hide test script: <html> <head> <script type="type/javascript"><!-- function showHide(elementid){ if (document.getElementById(elementid).style.display == 'none'){ document.getElementById(elementid).style.display = ''; } else { document.getElementById(elementid).style.display = 'none'; } } //--> </script> </head> <body> <div><a href="javascript:showHide('div_1035677');">more...</a></div> <div id="div_1035677" style="display:none"> HIDDEN CONTENT </div> </body> </html> I get an error message that I can't make any sense of (Object expected on line one). I don't see any errors in the above code. :-(

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• My Linq to Sql Insert code seems to work fine but I don't get a record in the database

  - by Alex

  Here is my code. In the debugger, I can see that the code is running. No errors are thrown. But, when I go back to the table, no row has been inserted. What am I missing?? protected void submitButton_Click(object sender, EventArgs e) { CfdDataClassesDataContext db = new CfdDataClassesDataContext(); string sOfficeSought = officesSoughtDropDownList.SelectedValue; int iOfficeSought; Int32.TryParse(sOfficeSought, out iOfficeSought); Account act = new Account() { FirstName = firstNameTextBox.Text, MiddleName = middleNamelTextBox.Text, LastName = lastNameTextBox.Text, Suffix = suffixTextBox.Text, CampaignName = campaignNameTextBox.Text, Address1 = address1TextBox.Text, Address2 = address2TextBox.Text, TownCity = townCityTextBox.Text, State = stateTextBox.Text, ZipCode = zipTextBox.Text, Phone = phoneTextBox.Text, Fax = faxTextBox.Text, PartyAffiliation = partyAfilliatinoTextBox.Text, EmailAddress = emailTextBox.Text, BankName = bankNameTextBox.Text, BankMailingAddress = bankAddressTextBox.Text, BankTownCity = bankTownCityTextBox.Text, BankState = bankStateTextBox.Text, BankZip = bankZipTextBox.Text, TreasurerFirstName = treasurerFirstNameTextBox.Text, TreasurerMiddleName = treasurerMiddleNamelTextBox.Text, TreasurerLastName = treasurerLastNameTextBox.Text, TreasurerMailingAddress = treasurerMailingAddressTextBox.Text, TreasurerTownCity = treasurerTownCityTextBox.Text, TreasurerState = treasurerStateTextBox.Text, TreasurerZipCode = treasurerZipTextBox.Text, TreasurerPhone = treasurerPhoneTextBox.Text //OfficeSought = iOfficeSought }; act.Suffix = suffixTextBox.Text; db.SubmitChanges(); }

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