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• Avoiding Mixup of Language Details

  - by DarenW

  Today someone asked me what was wrong with their source code. It was obvious. "Use double equals in place of that single equal in that if statement. Um, i think..." As i remember some languages actually take a single equals for comparison. Since i sometimes forget or mix up the syntax details among the several languages i use, i stepped over to my laptop to try a quickie experiment... It costs a bit of time and is a break in the flow to try "quick" experiments (though maybe the practice is good for memory.) What tips do you have for keeping straight in your mind the syntax (and other) details of multiple languages? (And nowadays, this applies just as well to the many wiki-like markups!)

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• DownloadError: ApplicationError

  - by Joel

  I have a function called DownloadData() which uses url.fetch(). From time to time it throws DownloadError: ApplicationError: 2 timed out error. How can I catch this error? With "except DownloadError: ApplicationError: 2 timed " or only "DownloadError"? It is hard to reproduce this error so I can not know which except to use. Thanks, Joel

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• Converting raw bytes into audio sound

  - by Afro Genius

  In my application I inherit a javastreamingaudio class from the freeTTS package then bypass the write method which sends an array of bytes to the SourceDataLine for audio processing. Instead of writing to the data line, I write this and subsequent byte arrays into a buffer which I then bring into my class and try to process into sound. My application processes sound as arrays of floats so I convert to float and try to process but always get static sound back. I am sure this is the way to go but am missing something along the way. I know that sound is processed as frames and each frame is a group of bytes so in my application I have to process the bytes into frames somehow. Am I looking at this the right way? Thanx in advance for any help.

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• jquery ajax error cannot find url outside of debug mode

  - by John Orlandella Jr.

  I inherited some code two weeks ago that is using the jquery.ajax method to connect to a .NET web service. Here is the piece of code give me the trouble... if (MSCTour.AppSettings.OFFLINE !== 'TRUE') { $.ajax({ url: url, data: json, type: "POST", contentType: "application/json", timeout: 10000, dataType: "json", // not "json" we'll parse success: function(res){ if (!callback) { return; } /* // *** Use json library so we can fix up MS AJAX dates */ var result = ""; if (res !== "") { try { result = $.evalJSON(res); } catch (e) { result = {}; bare = true; } } /* // *** Bare message IS result */ if (bare) { callback(result); return; } /* // *** Wrapped message contains top level object node // *** strip it off */ for (var property in result) { callback(result[property]); break; } }, error: function(xhr,status,error){ if (status === 'parsererror') {} else {return error;} }, complete: function(res, status){ if (callback) { if ((status != 'success' && status != 'error') || status === 'parsererror' || (status === 'timeout' && res !== '')) { try { result = $.secureEvalJSON(res); } catch (e) { result = {}; bare = true; } callback(res); } } return; } }); } The url variable at this point equals /testsite/service.svc/GetItems Now here is where my problem lies... When running this site out of debug mode through visual studio I am not having any problem connecting to the database through the web service and seeing all my data, for both viewing and updating. When I go through the normal web server for the same site, on the same page, no data is showing up. When I put a break on the error portion of the code above in firebug this is information I am getting in the image linked below. link text I am getting what appears to be a 404 error, but when I look on the server all of the files are in the right place... coupled with the fact that it works when in debug mode, I think I am slowly going crazy staring at these same lines of code trying to find the needle in the haystack. Any help or just a direction to look in would be greatly appreciated.

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• What's the best strategy to delete a very huge folder using Perl?

  - by André Diniz

  Hi, I need to delete all content (files and folders) under a given folder. The problems is: folder has millions of files and folders inside it. So I don't want to load all the file names in one go. Did you catch the issue? Logic should like this: iterate a folder without load everything get a file or folder delete it go to the next one Thanks for your help.

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• T-SQL Where statement - OR

  - by Zyphrax

  Sorry for the vague title but I really didn't know what title to give to this problem: I have the following result set: ID Data Culture 1 A nl-NL 2 B nl-NL 3 C nl-NL 4 A en-GB 5 B en-GB 6 A en 7 B en 8 C en 9 D en 10 A nl I would like to mimic the ASP.Net way of resource selection, user Culture (nl-NL) SELECT Data FROM Tbl WHERE Culture = 'nl-NL' Or when there are no results for the specific culture, try the parent Culture (nl) SELECT Data FROM Tbl WHERE Culture = 'nl' Or when there are no results for the parent culture, try the default Culture (en) SELECT Data FROM Tbl WHERE Culture = 'en' How can I combine these SELECT-statements in one T-SQL statement? I'm using LINQ so a LINQ expression would be even greater. The OR-statement won't work, because I don't want a mix of cultures. The ORDER BY-statement won't help, because it returns multiple records per culture.

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• Advice about insert into SQLCE

  - by Alexander

  i am inserting about 1943 records by these function into SQLCE.This is my insert function.Parameters come from StringReader(string comes from webservice).This function executes 1943 times and takes about 20 seconds.I dropped table's indexes,what can i do to improve it?I create just 1 time mycomm and sqlceresultset. Public Function Insert_Function(ByVal f_Line() As String, ByRef myComm As SqlCeCommand, ByRef rs As SqlCeResultSet) As String Try Dim rec As SqlCeUpdatableRecord = rs.CreateRecord() rec.SetInt32(0, IIf(f_Line(1) = "", DBNull.Value, f_Line(1))) rec.SetInt32(1, IIf(f_Line(2) = "", DBNull.Value, f_Line(2))) rec.SetInt32(2, IIf(f_Line(3) = "", DBNull.Value, f_Line(3))) rec.SetInt32(3, IIf(f_Line(4) = "", DBNull.Value, f_Line(4))) rec.SetValue(4, IIf(f_Line5(5) = "", DBNull.Value, f_Line(5))) rs.Insert(rec) rec = Nothing Catch ex As Exception strerr_col = ex.Message End Try Return strerr_col End Function

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• Java: using foreach over strings from arrayList does not print anything

  - by HH

  $ javac ArrayListTest.java $ java ArrayListTest $ cat ArrayListTest.java import java.io.*; import java.util.*; public class ArrayListTest{ public static void main(String[] args) { try { String hello ="oeoaseu oeu hsoae sthoaust hoaeut hoasntu"; ArrayList<String> appendMe = null; for(String s : hello.split(" ")) appendMe.add(s+" "); for(String s : appendMe) System.out.println(s); //WHY DOES IT NOT PRINT? }catch(Exception e){ } } }

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• Django admin causes high load for one model...

  - by Joe

  In my Django admin, when I try to view/edit objects from one particular model class the memory usage and CPU rockets up and I have to restart the server. I can view the list of objects fine, but the problem comes when I click on one of the objects. Other models are fine. Working with the object in code (i.e. creating and displaying) is ok, the problem only arises when I try to view an object with the admin interface. The class isn't even particularly exotic: class Comment(models.Model): user = models.ForeignKey(User) thing = models.ForeignKey(Thing) date = models.DateTimeField(auto_now_add=True) content = models.TextField(blank=True, null=True) approved = models.BooleanField(default=True) class Meta: ordering = ['-date'] Any ideas? I'm stumped. The only reason I could think of might be that the thing is quite a large object (a few kb), but as I understand it, it wouldn't get loaded until it was needed (correct?).

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• What is your ratio Bug fixing vs Enhancements ?

  - by Newtopian

  In the spirit of this question I wanted to have a sense of what is the proportion of time split between fixing bugs and implementing new features. If possible try to give an estimate for the product as a whole as opposed to individual developer stats and try to make an average over the course of a typical year. Do provide a general descriptive of the product/project to allow comparison. Specifically : Maturity of project Is it still actively developed or strictly in maintenance ? Size estimate of the product/project Size of team developing it (all inclusive) What is your team score on the Joel test. Ex : approx 80% time spent bug fixes 20% new stuff Mature software (20 years old) Actively developed 1.5M Line of Text, approx 700k - 900k LOC 12-15 actively coding in it. we got 5/12 for sure, some would say 7/12.

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• How do I get secure AuthSub session tokens in PHP ?

  - by robertdd

  I am using the Google/YouTube APIs to develop web application which needs access to a users YouTube account. Normal unsecure requests work fine and I can upgrade one time tokens to session tokens without any hassle. The problem comes when I try and upgrade a secure token to a session token, I get: ERROR - Token upgrade for CIzF3546351vmq_P____834654G failed : Token upgrade failed. Reason: Invalid AuthSub header. Error 401 i use this: function updateAuthSubToken($singleUseToken) { try { $client = new Zend_Gdata_HttpClient(); $client->setAuthSubPrivateKeyFile('/home/www/key.pem', null, true); $sessionToken = Zend_Gdata_AuthSub::AuthSubRevokeToken($sessionToken, $client); $client->setAuthSubToken($sessionToken); } catch (Zend_Gdata_App_Exception $e) { print 'ERROR - Token upgrade for ' . $singleUseToken . ' failed : ' . $e->getMessage(); return; } $_SESSION['sessionToken'] = $sessionToken; generateUrlInformation(); header('Location: ' . $_SESSION['homeUrl']); }

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• File size and mime-type before upload

  - by Marcos Placona

  Hi, I've scavenged on every single topic on this forum to try and find an answer before I posted this. Most people say you should simply use SWFUpload, some others mention Activex, and it keeps going. I know this is do-able, as Google does it with gMail when you try to upload a file that's bigger than 25mb, or executable. My question is, how can I determine the file size and mime-type before the file actually hits my server. I primarily thought it was an impossible task, but Google proves me wrong. Could anyone give me a definitive answer on how to accomplish such task? Thanks

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• Use trackball for scrolling in Android ListView

  - by gartenkralleb

  hi, i have a ListView, whose content should not be selectable. i set the ListView to choiceMode="none" and set a transparent listSelector. for touch mode it acts as desired. a problem is the use of the trackball. if i try to use it for scrolling, the scroll starts after the 10th push to "down". this is caused by the invisible listSelector, which scrolls down the list until the 10th list item is "invisibily" selected. i try to override dispatchTrackballEvent and do the scrolling with scrollBy, but i did not finished this approach yet, to have a look on alternative suggestions. is there a simple solution for my problem?

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• How to pass the parameter in SQL query from PowerShell

  - by Zshava

  I have this code in PowerShell, that executes SQL query for UPDATE table: $Connection=new-object data.sqlclient.sqlconnection "server=server;database=mydb;trusted_connection=true;" $Connection.open() For( $i = 0; $i -le $ActID.Length; $i ++ ){ $cmd = New-Object System.Data.SqlClient.SqlCommand $cmd.Connection = $Connection $cmd.CommandText = " update Table set Note = @PATH " $cmd.Parameters.Add("@PATH", $ActID[$i].Values) | Out-Null $cmd.ExecuteNonQuery() } I try to update table with variable defined in this string: $cmd.Parameters.Add("@PATH", $ActID[$i].Values) | Out-Null But when i try to execute script, error log says that there is no value passed in $ActID[$i] Is there other methods to pass parameters (variables) in powershell queries?

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• Compound dictionary keys

  - by John Keyes

  I have a particular case where using compound dictionary keys would make a task easier. I have a working solution, but feel it is inelegant. How would you do it? context = { 'database': { 'port': 9990, 'users': ['number2', 'dr_evil'] }, 'admins': ['[email protected]', '[email protected]'], 'domain.name': 'virtucon.com' } def getitem(key, context): if hasattr(key, 'upper') and key in context: return context[key] keys = key if hasattr(key, 'pop') else key.split('.') k = keys.pop(0) if keys: try: return getitem(keys, context[k]) except KeyError, e: raise KeyError(key) if hasattr(context, 'count'): k = int(k) return context[k] if __name__ == "__main__": print getitem('database', context) print getitem('database.port', context) print getitem('database.users.0', context) print getitem('admins', context) print getitem('domain.name', context) try: getitem('database.nosuchkey', context) except KeyError, e: print "Error:", e Thanks.

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• Store PHP Exceptions in array

  - by Industrial

  Hi everyone, I am really not sure if this is the right way to go, since exceptions is really a fresh subject to me. Is it possible to catch multiple exceptions (let the execution of the script continue) and then store the exceptions in a array to be able to return all exceptions caused? By that said, it would be awesome to be able to use exceptions to more than just showing an error that kills the application (script) Thanks!

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• Tracking the user function that threw the exception

  - by makerofthings7

  I've been given a large application with only one try..catch at the outer most level. This application also throws exceptions all the time, and is poorly documented. Is there any pattern I can implement that will tell me what user method is being called, the exception being thrown, and also the count of exceptions? I'm thinking of using a dictionary with reflection to get the needed information, but I'm not sure if this will work. What do you think?

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• jquery won't fade text if positioned: absolute;

  - by DA

  I have LI that I want to fade out and back in. Within the list item I have some text. This text is positioned absolutely within the LI. The catch is that in IE8 (IE6 and 7 seem fine) I can get everything to fade except the text: http://jsbin.com/esamu/13 If I remove the absolute positioning on the text element (in this case, a P), IE8 then can fade the text properly: http://jsbin.com/esamu/14 Anyone know why this is? Anyone know of a fix?

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• remove ViewController from memory

  - by user262325

  hello everyone I hope to load an ViewController and do something then unload it from memory. if (self.vViewController5.view.superview==nil) { ViewController5 *blueController = [[ViewController5 alloc] initWithNibName:@"View5" bundle:nil]; self.vViewController5 = blueController; [self.vViewController5 setDelegate:self]; [blueController release]; } [self presentModalViewController:vViewController5 animated:YES]; later, call [self dismissModalViewControllerAnimated:YES]; but I found that dismissModalViewControllerAnimated does not trigger the event viewDidUnload of Viewcontroller5. I try function release but it caused program collapse. I also try removeFromSuperView but it does not trigger the event ViewDidUnload neither. Welcome any comment Thanks interdev

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• printf field width : bytes or chars?

  - by leonbloy

  The printf/fprintf/sprintf family supports a width field in its format specifier. I have a doubt for the case of (non-wide) char arrays arguments: Is the width field supposed to mean bytes or characters? What is the (correct-de facto) behaviour if the char array corresponds to (say) a raw UTF-8 string? (I know that normally I should use some wide char type, that's not the point) For example, in char s[] = "ni\xc3\xb1o"; // utf8 encoded "niño" fprintf(f,"%5s",s); Is that function supposed to try to ouput just 5 bytes (plain C chars) (and you take responsability of misalignments or other problems if two bytes results in a textual characters) ? Or is it supposed to try to compute the length of "textual characters" of the array? (decodifying it... according to the current locale?) (in the example, this would amount to find out that the string has 4 unicode chars, so it would add a space for padding).

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• C++ Project compiles as static lib, fails (linker error) as dynamic lib. why??

  - by Roey

  Hi All. I've a VS2008 native C++ project, that I wish to compile as a DLL. It only references one external library (log4cplus.lib), and uses its functions. (also uses log4cplus's .h files , naturally). When I try to compile my project as a static library, it succeeeds. When I try as DLL, it fails : 1>MessageWriter.obj : error LNK2019: unresolved external symbol "public: static class log4cplus::Logger __cdecl log4cplus::Logger::getInstance(class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > const &)" (?getInstance@Logger@log4cplus@@SA?AV12@ABV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z) referenced in function "class log4cplus::Logger __cdecl Log(void)" (?Log@@YA?AVLogger@log4cplus@@XZ) There are 4 more errors just like this related to functions within log4cplus.lib. It seems like something really stupid.. please help me :) Thanks!

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• Is there a reason Image.FromFile throws an OutOfMemoryException for an invalid image format?

  - by Arc

  I am writing code that catches this OutOfMemoryException and throws a new, more intuitive exception: /// ... /// <exception cref="FormatException">The file does not have a valid image format.</exception> public static Image OpenImage( string filename ) { try { return Image.FromFile( filename, ); } catch( OutOfMemoryException ex ) { throw new FormatException( "The file does not have a valid image format.", ex ); } } Is this code acceptable to its user, or is OutOfMemoryException intentionally being thrown for a particular reason?

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• Problem with glaux.h locating

  - by rodnower

  Hello, I try to compile code, that beggins with: #include<stdlib.h> #include<GL/gl.h> #include<glaux.h> with command: cc -o test test.c -I/usr/local/include -L/usr/local/lib -lMesaaux -lMesatk -lMesaGL -lXext -lX11 -lm But one of errors I got is: test.c:3:18: error: glaux.h: No such file or directory Then I try: yum provides glaux.h but yum find anything. Before all I installed Mesa with: yum install mesa* So, can anyone tell me from where I can get the header file? Thank you for ahead.

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• executable was signed with invalid entitlements ?

  - by balraj

  HI,all I am trying to install an app in the iphone using the adhoc build configuration for this i have made all the things first i created the app id that is enable fort he APNS and then create the profile and certificates and than i download to my system and then in the project i have made a plist name Adhoc_Entitlements.plist and in the code signing entitlements i put it name with extension and in the bundle identifier i put the name of the identifier that is used in the provision file and when i try to install in the device it throws the error i have mentioned,Any solution or anything that i am doing wrong.This is the error message i got when i try to install in the device. Thanks the error message is as -- The entitlements specified in your application's code signing entitlements file do not match those specified in your provisioning profile.

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• Temporarily impersonate and enable privileges?

  - by Luke

  We maintain a DLL that does a lot of system-related things; traversing the file system, registry, etc. The callers of this DLL may or may not be using impersonation. In order to better support all possible scenarios I'm trying to modify it to be smarter. I'll use the example of deleting a file. Currently we just call DeleteFile(), and if that fails that's the end of that. I've come up with the following: BOOL TryReallyHardToDeleteFile(LPCTSTR lpFileName) { // 1. caller without privilege BOOL bSuccess = DeleteFile(lpFileName); DWORD dwError = GetLastError(); if(!bSuccess && dwError == ERROR_ACCESS_DENIED) { // failed with access denied; try with privilege DWORD dwOldRestorePrivilege = 0; BOOL bHasRestorePrivilege = SetPrivilege(SE_RESTORE_NAME, SE_PRIVILEGE_ENABLED, &dwOldRestorePrivilege); if(bHasRestorePrivilege) { // 2. caller with privilege bSuccess = DeleteFile(lpFileName); dwError = GetLastError(); SetPrivilege(SE_RESTORE_NAME, dwOldRestorePrivilege, NULL); } if(!bSuccess && dwError == ERROR_ACCESS_DENIED) { // failed with access denied; if caller is impersonating then try as process HANDLE hToken = NULL; if(OpenThreadToken(GetCurrentThread(), TOKEN_QUERY | TOKEN_IMPERSONATE, TRUE, &hToken)) { if(RevertToSelf()) { // 3. process without privilege bSuccess = DeleteFile(lpFileName); dwError = GetLastError(); if(!bSuccess && dwError == ERROR_ACCESS_DENIED) { // failed with access denied; try with privilege bHasRestorePrivilege = SetPrivilege(SE_RESTORE_NAME, SE_PRIVILEGE_ENABLED, &dwOldRestorePrivilege); if(bHasRestorePrivilege) { // 4. process with privilege bSuccess = DeleteFile(lpFileName); dwError = GetLastError(); SetPrivilege(SE_RESTORE_NAME, dwOldRestorePrivilege, NULL); } } SetThreadToken(NULL, hToken); } CloseHandle(hToken); hToken = NULL; } } } if(!bSuccess) { SetLastError(dwError); } return bSuccess; } So first it tries as the caller. If that fails with access denied, it temporarily enables privileges in the caller's token and tries again. If that fails with access denied and the caller is impersonating, it temporarily unimpersonates and tries again. If that fails with access denied, it temporarily enables privileges in the process token and tries again. I think this should handle pretty much any situation, but I was wondering if there was a better way to achieve this? There are a lot of operations that we would potentially want to use this method (i.e. pretty much any operation that accesses securable objects).

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