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• How to correctly formalize the command line usage of GNU/Linux commands?

  - by Francesco Turco

  I'd like to write down a BNF-like formal grammar for describing the command line usage of some GNU/Linux tools. For example I can describe the usage of the cat command as: (cat-command) : 'cat' (arguments-list) (arguments-list) : (argument) (arguments-list) : (arguments-list) (argument) (argument) : (file) The problem is I can't write down a precise grammar for some commands such as md5sum. My first attempt at that would be the following: (md5sum-command) : 'md5sum' (arguments-list) (arguments-list) : (argument) (arguments-list) : (arguments-list) (argument) (argument) : (file) (argument) : '--check' But as you can see this grammar allows you to specify the --check argument as many times as you wish, which is incorrect as you should use it at most one time. How can I fix that? Also, what kind of formal grammars I should study for better treating this kind of problems? Thanks.

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• Can one prevent Genshi from parsing HTML entities?

  - by DNS

  I have the following Python code using Genshi (simplified): with open(pathToHTMLFile, 'r') as f: template = MarkupTemplate(f.read()) finalPage = template.generate().render('html', doctype = 'html') The source HTML file contains entities such as &copy;, &trade; and &reg;. Genshi replaces these with their UTF-8 character, which causes problems with the viewer (the output is used as a stand-alone file, not a response to a web request) that eventually sees the resulting HTML. Is there any way to prevent Genshi from parsing these entities? The more common ones like &amp; are passed through just fine.

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• Encoding in python with lxml - complex solution

  - by Vojtech R.

  Hi, I need to download and parse webpage with lxml and build UTF-8 xml output. I thing schema in pseudocode is more illustrative: from lxml import etree webfile = urllib2.urlopen(url) root = etree.parse(webfile.read(), parser=etree.HTMLParser(recover=True)) txt = my_process_text(etree.tostring(root.xpath('/html/body'), encoding=utf8)) output = etree.Element("out") output.text = txt outputfile.write(etree.tostring(output, encoding=utf8)) So webfile can be in any encoding (lxml should handle this). Outputfile have to be in utf-8. I'm not sure where to use encoding/coding. Is this schema ok? (I cant find good tutorial about lxml and encoding, but I can find many problems with this...) I need robust approved solution so I ask you seniors. Many thanks

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• asn.1 parser in C/Python

  - by elventear

  I am looking for a solution to parse asn.1 spec files and generate a decoder from those. Ideally I would like to work with Python modules, but if nothing is available I would use C/C++ libraries and interface them with Python with the plethora of solutions out there. In the past I have been using pyasn1 and building everything by hand but that has become too unwieldly. I have also looked superficially to libtasn1 and asn1c. The first one had problems parsing even the simplest of files. The second has a good parser but generating C code for decoding seems too complex; the solution worked well with straightforward specs but choked on complex ones. Any other good alternatives I may have overlooked?

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• mysql utf8 turkish characters not correct recognized

  - by sabri.arslan

  Hello, In mysql utf8 coded turkish data i can't search "I" and "i". when i search its giving result contains "Y" or "y". Because in latin1 "I" displaying as "Ý" and "i" as "ý". in latin1 data i was used latin1_general_ci for correct result. but there is not alternative collation for utf8. its already utf8_general_ci. is there any other people have some problems or do you have a solution. thanks. i have tried stackoverflow search engine to for this problem. if its have mysql and utf8 then my work true. try search "alI" and "ali". both search give another result. but both same in turkish. the "I" is capital i and capital "I" is "i" in turkish.

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• Python (windows) will open files from command line, but not from a script launched from eclipse

  - by Blake

  I'm pretty new to writing python for windows (linux is no problem), and am having problems getting python to recognize files when running scripts, though it behaves fine in the command line What am I doing wrong here? def verifyFile(x): # return os.path.isfile(x) This will return true (with a valid file, of course) when called from the python command line, but when I run the script from eclipse, or launch it from windows, it ALWAYS returns false. Any thoughts on why this is? I've tried passing pathnames like this: D:\Documents and Settings\BDE\Desktop\cdburn.jpg and like this: D:/Documents and Settings/BDE/Desktop/cdburn.jpg I've changed sys,argv[0] to '' I've tried this: def verifyFile(x): # try: f = open(x, 'r') f.close() return True except: return False and am getting no love! Any help would be appreciated. Thanks Blake

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• How to benchmark apache/nginx setup

  - by Saif Bechan

  I am planning to setup nginx as reverse proxy. I will have apache to deliver my dynamic content, and nginx will deliver the static content. My configuration i have now is just Apache with fastCGI. This gives me no configuration problems and runs great. After I have set up nginx I want to run some benchmarks to see if I really got some performance increases, else i will switch back. Does anyone know how I can benchmark this type of setup? Or maybe someone did this already and have some canned results, I will be glad to hear them. PS. I know this is more a serverfault type of question, but i have seen numerous posts about apache and nginx so i thought i give it a try

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• How to convert from K&R C to ANSI C?

  - by Vadakkumpadath

  I am trying to execute following code which is the 1988 entry of Obfuscated C Code Contest. #define _ -F<00||--F-OO--; int F=00,OO=00;main(){F_OO();printf("%1.3f\n",4.*-F/OO/OO);}F_OO() { _-_-_-_ _-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_-_-_-_-_ _-_-_-_-_-_-_-_ _-_-_-_ } From entry description, this code is calculating pi by looking at its own area. I successfully compiled it without changing the code. But when I executed, it is giving me a value 0.25, what I am expecting is 3.14. Code description says it is in K&R C and it doesn't work correctly in ANSI C without some change. I think I have to do those modification to execute it properly. I don't have any previous experience with K&R C. So can someone help me to change above code to ANSI C or point to the problems if any. I am using Microsoft Visual Studio 2008 to execute this.

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• Upgrade from Delphi 2007 to Delphi 2010?

  - by Nik

  What should I worry about if I move to Delphi 2007 to 2010? I've checked this article and there was a lot of interesting stuff but not precisely for this jump that I need. To clarify my question and situation: I have all 3td party components' code. I will need the unicode, but not this year. I need win 7 support - themes, form resize problems and etc. I will be happy to have a dissent help system. Is ADO (dbGO) improved? What headache to expect? Thanks!

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• SQL Server Bulk Insert failing when called from .NET SqlCommand

  - by Nick Wright

  I have a stored procedure which does bulk insert on a SQL server 2005 database. When I call this stored procedure from some SQL (passing in the name of a local format file and data file) it works fine. Every time. However, when this same stored procedure gets called from C# .NET 3.5 code using SqlCommand.ExecuteNonQuery it works intermittently. When it fails a SqlException is generated stating "Cannot bulk load. Invalid column number in the format file "c:\bulkinsert\MyFile.fmt" I don't think this error message is correct. Has anyone experienced similar problems with calling bulk insert from code? Thanks.

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• Calling activateWindow on QDialog sends window to background

  - by Stan

  I am debugging certain application written with C++/Qt4. On Linux it has problems that with certain window managers (gnome-wm/metacity), the main window (based on QDialog) is created in the background (it's not raised). I managed to re-create the scenario using PyQt4 and following code: from PyQt4.QtCore import * from PyQt4.QtGui import * import sys class PinDialog(QDialog): def showEvent(self, event): QDialog.showEvent(self, event) self.raise_() self.activateWindow() if __name__ == "__main__": app = QApplication(sys.argv) widget = PinDialog() app.setActiveWindow(widget) widget.exec_() sys.exit(0) If I remove self.activateWindow() the application works as expected. This seems wrong, since documentation for activateWindow does not specify any conditions under which something like this could happen. My question is: Is there any reason to have activateWindow in showEvent in the first place? If there is some reason, what would be good workaround for focusing issues?

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• Can't locate in @inc during CPAN dependency install performed not as root.

  - by garrett

  While trying to do: perl -I'/v1/data/site_perl' -MCPAN -e 'install Log::Dispatch'; I continue to get "Can't locate Params/Validate.pm in @INC." When looking at the output, /v1/data/site_perl is NOT in the @INC displayed, even though I used -I. I am not root so I have changed my CPAN config so that: 'makepl_arg' => q[LIB=/v1/data/site_perl INSTALLSITEMAN1DIR=/v1/data/site_perl/man/man1 INSTALLSITEMAN3DIR=/v1/data/site_perl/man/man3 INSTALLMAN1DIR=/v1/data/site_perl/man/man1 INSTALLMAN3DIR=/v1/data/site_perl/man/man3] So even LIB is set. In a basic script I have: use lib '/v1/data/site_perl'; use Params::Validate; With no problems. How do I make the Log::Dispatch use lib /v1/data/site_perl without a force install? What am I missing?

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• Getting 401 on Twitter OAuth POST requests

  - by Baishampayan Ghose

  I am trying to use Twitter OAuth and my POST requests are failing with a 401 (Invalid OAuth Request) error. For example, if I want to post a new status update, I am sending a HTTP POST request to https://twitter.com/statuses/update.json with the following parameters - status=Testing&oauth_version=1.0&oauth_token=xxx& oauth_nonce=xxx&oauth_timestamp=xxx&oauth_signature=xxx& oauth_consumer_key=xxx&in_reply_to=xxx&oauth_signature_method=HMAC-SHA1` My GET requests are all working fine. I can see on the mailing lists that a lot of people have had identical problems but I could not find a solution anywhere. I am using the oauth.py Python library.

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• Scheme homework problem, need help.

  - by poorStudent

  Okay one of my homework problems is to take a list of lists and return the car of each sublist as a list. I have it to where I can print out the values, but it's not a list. To be honest, I have no clue how to output lists. Here's what I got: (define (car-print alist) (if (null? alist) (newline) (begin (write (car (car alist))) (display " ") (car-print(cdr alist))))) This is a cheap way to do it, perhaps some help on actually solving this problem would be much appreciated. Not necessarily the full answer but steps to get there. Thanks.

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• armv6 / armv7 errors when compiling for iPhone

  - by Chris

  I am having problems trying to compile my App to my iPhone. I upgraded to the new SDK and have 4.0 on my phone... which I did not do that. I am compiling for 3.1.2 - It works fine in the simulator but when I "build" for the Device, it gives me this line of errors: Link /Users/me/Apps/myapp/build/app.build/Debug-iphoneos/app.build/objects-normal/armv7/appname In /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.3.sdk/user/lib/libz.dylib, missing required architecture armv7 in file then the actual failure occurs on: Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1 Any help would be greatly appreciated

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• Using Django Admin for a custom database solution

  - by Prashanth Ellina

  A client wants to have a simple intranet application to manage his process. He runs a Quarry and wishes to track number of loads delivered per day and associated activities. Since I knew about Django's excellent Admin interface, I figured I could define the "Schema" in models.py and have Django Admin generate the forms. I did exactly that and the result is not bad at all. I've been able to customize the look and feel to suit the client's taste. Some questions: Is Django Admin the right choice for such a use-case? Will I run to problems in the future due to flexibility of the framework? Is there a better framework out there specifically designed for this use-case (general Database management for small businesses)? I prefer ones written in Python since I can hack it up to customize. Thanks!

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• Updating the datalist in a RadComboBox

  - by jphenow

  So I'm just struggling with a lot of little things in the web app so I'm checking up with all kinds of stuff to make sure i'm not breaking it cause of stupid problems. At some point in my web app (trying to keep it mostly Asynchronous) I have to update the list in my RadComboBox because something was added. Do I just need to call RadComboBox.DataBind() again? Since I don't explicitly use its datasource(I do it in the manual insert using a string fashion) object to insert my new record do I need to tell that to update? The list just doesn't seem to update when i just call databind so I feel like i need to have the datasource recheck for entries or SOMETHING Thanks

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• GPS with J2ME polish

  - by JV

  Hi all, I'm developing an GPS based application with J2ME and J2ME polish(2.1.2), i'm facing problems for accessing the location class. I'm getting the following exception Exception in thread "event-thread" java.lang.UnsatisfiedLinkError: aa.a(I)V Nokia/N95: at aa.a(Native Method) Nokia/N95: at ae.<clinit>(Unknown Source) Nokia/N95: at b.j(Unknown Source) Nokia/N95: at com.allstate.mini.MINIMidlet.commandAction(Unknown Source) Nokia/N95: at ax.b(Unknown Source) Nokia/N95: at u.b(Unknown Source) Nokia/N95: at al.d(Unknown Source) Nokia/N95: at bd.keyReleased(Unknown Source) Nokia/N95: at javax.microedition.lcdui.Display$KeyEvent.run(Display.java:158) Nokia/N95: at org.microemu.device.ui.EventDispatcher.post(EventDispatcher.java:144) Nokia/N95: at org.microemu.device.ui.EventDispatcher.run(EventDispatcher.java:74) Nokia/N95: at java.lang.Thread.run(Unknown Source) Please help...

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• saving information in file in php

  - by Mac Taylor

  hey guys i want to write a tracking system and now i can save in my Mysql database . but saving information about each ip that visits is a huge work for mysql so i think if i could save the information in a file , then there is no discussion about database and its problems . but to begin this : i realy dont know how to save in a file in a way that i can read it with no problem and show the details this is what is used to insert into my database sql_query("insert into tracking (date_time, ip_address, hostname,referer, page , page_title) values ('".sql_quote($dt)."', '".sql_quote($ipaddr)."', '".sql_quote($hostnm)."','$referer', '".sql_quote($pg)."', '".sql_quote($pagetitle)."')", $dbi); i need to show information about all ips in rows , after saving in a file what should i do to save and show in row order ( table ) php/mysql

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• Frustrated with Objective-c code...

  - by Moshe

  Well, I've started with iPod/iPhone programming using Head First iPhone Development (O'reilly) and I'm typing code out of the book. There are two problems, one is programming related and the other is not. I don't understand the format of objective-c methods. I'm getting an few errors now, based on source code from the book. Which leads me to my next issue. Some of the code is buggy. I think so because I couldn't get the code to run without modifying it. The book has some typos in the text since it's a first edition and whatnot, but could my "fixing" the code have to do with it? So... Where can I learn more about objective-c methods and how they work in terms of structure and where the return type and arguments go? For those with the book, I'm in the middle of the InstaTweet app towards the beginning. Thanks.

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• trouble configuring WCF to use session

  - by Michael

  I am having trouble in configuring WCF service to run in session mode. As a test I wrote this simple service : [ServiceContract] public interface IService1 { [OperationContract] string AddData(int value); } [ServiceBehavior(InstanceContextMode=InstanceContextMode.PerSession)] internal class Service1 : IService1,IDisposable { private int acc; public Service1() { acc = 0; } public string AddData(int value) { acc += value; return string.Format("Accumulator value: {0}", acc); } #region IDisposable Members public void Dispose() { } #endregion } I am using Net.TCP binding with default configuration with reliable session flag enabled. As far as I understand , such service should run with no problems in session mode. But , the service runs as in per call mode - each time I call AddData , constructor gets called before executing AddData and Dispose() is called after the call. Any ideas why this might be happening?

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• Detect if a table contains a column in Android/sqlite

  - by sandis

  So I have an app on the market, and with an update I want to add some columns to the database. No problems so far. But I want to detect if the database in use is missing these columns, and add them if this is the case. I need this to be done dynamically and not just after the update to the new version, because the application is supposed to still be able to import older databases. Normally I would be able to use the PRAGMA query, but Im not sure how to do this with Android. I cant use execSQL since it is a query, and I cant figure out how to use PRAGMA with the query()-function. Ofcourse I could just catch exceptions and then add the column, or always add the columns to each table before I start to work with it, but that is not a neat solution. Cheers,

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• Are these good interview questions for Flex developer?

  - by Ivan Belov

  I am responsible for creating a team, which will build a Flex application. Unfortunately I have zero experience with Flex. So I found an expert within our company to interview candidates. Our expert came up with the following questions: how to write item renderers explain methods commitProperties, updateDisplayList, measure binding positive / negative parts, problems with binding what is ClassFactory ? And why is it needed ? how callLater works ? what is layoutChrome ? what is skin ? did you use autogeneration for Java backend ? how to override managers ? like PopupManager . These sound a little too specific for my taste. Would you say they are decent questions? Is it fair to say, for example, that if Flex developer does not know how to write item renderer, he has very little knowledge of Flex?

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• Get a class name with generics information

  - by Damien

  Hello, In a java serialization problem, I want to save some classes name and I have some problems with generic classes. For example : - If I have ArrayList<String> listToDump = new ArrayList<String>(); - If I take the name : listToDump.getName(); or listToDump.getCanonicalName(); - I will have java.util.ArrayList or ArrayList - And I want to have java.util.ArrayList<String> or ArrayList<String> Any ideas on how I can do this? Damien.

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• Proper way of utilizing gearman with my php application.

  - by luckytaxi

  For now I just want to use Gearman for background processing. For example, I need to email a recipient that they have a private message waiting for them once the sender submits their message into the DB. I assume I can run the worker/client and server on my primary server but I have no problems offloading some of the tasks to a different web server. Anyways, my question is how do I handle multiple "functions?" Let's say I need a job that handles the email portion and a job to handle image manipulation. Can I have multiple functions in the worker? I've followed a couple of examples I found online but each example only shows one function being initialized. Do I have to start up multiple "workers" to handle multiple functions?

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