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• Adding code to the beginning / end of methods in runtime dynamically

  - by Irchi

  I know instrumentation is a technique to add trace code dynamically into the methods to enable tracing and debugging. I was wondering if this is only a "Trace" option, hard coded into the CLR to add only trace code, or is there the ability to add any code to the methods? For example, I want to check for a condition in the beginning of every single method call in a certain class (say for permissions). Can I do this via adding dynamic code to the beginning of the methods in execution time? I'm not sure how this trace "instrumentation" thing works, but I'm wondering if this can be used for other goals too, or not.

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• stars and slideshow input not working in IE browsers

  - by pradeep

  http://ratingscorner.com/product_rating.php?alias=Rashtreeya-Vidyalaya-College-of-Engineering-Mysore-Road-Bangalore&product=colleges I have a page like this .this works very well in all browsers, but not in IE. problem in IE is that : 1. If you go to "your ratings" tab in second section. the stars and input are not clickable only. 2. and the gap between tabs and tables are more in IE .. tried to check in firebug also. the element has not margin or padding at bottom. the slideshow also does not work in IE

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• Teacher confused about MVC?

  - by Gideon

  I have an assignment to create a game in java using MVC as a pattern. The thing is that stuff I read about MVC aren't really what the teacher is telling me. What I read is that the Model are the information objects, they are manipulated by the controllers. So in a game the controller mutates the placement of the objects and check if there is any collision etc. What my teacher told me is that I should put everything that is universal to the platform in the models and the controllers should only tell the model which input is given. That means the game loop will be in a model class, but also collision checks etc. So what I get from his story is that the View is the screen, the Controller is the unput handeler, and the Model is the rest. Can someone point me in the right direction?

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• C# IF statement against SQLite query result

  - by jakesankey

  I have a C# application that I am attempting to check my sqlite db if a filename already exists in the FileName column, if it DOESN'T exist, execute some code.. Here is what I am working with. string[] files = Directory.GetFiles(@"C:\Documents and Settings\js91162\Desktop ", "R303717*.txt*", SearchOption.AllDirectories); foreach (string file in files) { string FileNameExt1 = Path.GetFileName(file); insertCommand.CommandText = @" SELECT * FROM Import WHERE FileName == FileNameExt1;"; } string contYes = insertCommand.ExecuteNonQuery(); if (string.IsNullOrEmpty(contYes)) { //more code } EDIT: added space in path so that slash doesn't eat quotation mark

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• How can unit testing make parameter validation redundant?

  - by Johann Gerell

  We have a convention to validate all parameters of constructors and public functions/methods. For mandatory parameters of reference type, we mainly check for non-null and that's the chief validation in constructors, where we set up mandatory dependencies of the type. The number one reason why we do this is to catch that error early and not get a null reference exception a few hours down the line without knowing where or when the faulty parameter was introduced. As we start transitioning to more and more TDD, some team members feel the validation is redundant. Uncle Bob, who is a vocal advocate of TDD, strongly advices against doing parameter validation. His main argument seems to be "I have a suite of unit tests that makes sure everything works". But I can for the life of it just not see in what way unit tests can prevent our developers from calling these methods with bad parameters in production code. Please, unit testers out there, if you could explain this to me in a rational way with concrete examples, I'd be more than happy to seize this parameter validation!

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• Classic asp paging and session state

  - by flavour404

  Hi, Working on a classic asp page that uses paging. The error I am having a problem with is this: Lets say that you have 5 pages returned in your record set and you are on page 2. You leave and come back, you then press the link for page 3, the trouble is your session has timed out. I don't know why this happens but the page is reloaded, but the session check is bypassed and of course when the page attempts to retrieve the record set the session variables are now empty so I am getting a message stating: error near ',' line 1, because now the query is defunct. How do I get around this? Thanks, Ron.

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• Accessing a variable passed by jquery using php

  - by celenius

  How does php access a variable passed by JQuery? I have the following code: $.post("getLatLong.php", { latitude: 500000}, function(data){ alert("Data Loaded: " + data); }); but I don't understand how to access this value using php. I've tried $userLat=$_GET["latitude"]; and $userLat=$_GET[latitude]; and then I try to print out the value (to check that it worked) using: echo $userLat; but it does not return anything. I can't figure out how to access what is being passed to it.

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• creating a table based on fields from three different tables

  - by ozlem

  Hi, I am using MS-Access 2003. I have three tables containing values of w,Q and L. In the Q table I have three fields: country_name, ISIC_code, and Q value. In the L table, there are three fields, country_name, ISIC_code, and L value. And in the w table there are two fields; country_name and w value. Country_names, and ISIC_code might be different for each table. What I want to do is create a new table with the values b(j)=w(i)L(ij)/Q(ij), where i is the country and j is the ISIC_code. So first I will check if the country name and ISIC_code are the same in L and Q tables. If they are equal I will calculate L/Q and then multiply this with w value of the same country if it exists. I appreciate any help.

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• password/login system in php

  - by Jonathan

  For a login system in php would this be a suitable outline of how it would work: users types in username and password, clicks login button. Checks if user exists in database, if it does, then retrieve the salt for that user hash the password and salt (would this be done on the client or server side? I think client side would be better, but php is server side so how would you do this?) check value against value in database, if the values match then user has typed in correct password and they are logged in.

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• Android: The concept for detecting changes of an opened file

  - by niko

  I wrote an application for video recording which stores the recording to a file. Currently I am looking for a way to implement some kind of "listener" to listen for file changes. The concept I would like to implement is the following: Check the file on a set period of time (for example one second), extract changes (get the data that was written in the last period) and do something with these data. I would be very thankful if anyone of you could give any suggestion or point to any useful resource that could help to solve the given problem.

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• Samsung Galaxy tab Textbox issue

  - by csharpnewbie

  We are working on a mobile web application( .NET based). We are facing an issue in Samsung galaxy tab text box. Pls find below the details. Let me know if you need more details. Problem in Samsung tab 750 We have a login screen where we focus on the input text box the Samsung tab keypad pops up and the design is completely collapsed. And the same is working fine in iPad. Wanted to check any settings or CSS property to fix this issue. ![After tapping on the text box]

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• Edit strings vars in compiled exe? C++ win32

  - by extintor

  I want to have a few strings in my c++ app and I want to be able to edit them later in the deployed applications (the compiled exe), Is there a way to make the exe edit itself or it resources so I can update the strings value? The app checks for updates on start, so I'm thinking about using that to algo send the command when I need to edit the strings (for example the string that contains the url used to check for updates). I don't want to use anything external to the exe, I could simply use the registry but I prefer to keep everything inside the exe. I am using visual studio 2010 c++ (or any other version of ms visual c++).

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• Android string formatiing from xml

  - by mann

  I am parsing xml from server. One of its node contains data like <distance>16.3432434324354324km</distance> I am putting it into hashmap like for (int i = 0; i < nl.getLength(); i++) { map.put(KEY_DISTANCE, parser.getValue(e, KEY_DISTANCE)); // adding HashList to ArrayList menuItems.add(map); } Everything is nice. But i want it two decimal places for example i want its value should be 16.34km rather then 16.343234324342342km I tried with DecimalFormat twoDForm=new DecimalFormat("##.00"); try{ Double StartVTwo=Double.valueOf(KEY_DISTANCE); Double resultDouble1 = Double.valueOf(twoDForm.format(StartVTwo)); Log.e("check", String.valueOf(resultDouble1)); }catch (NumberFormatException e){ Log.e("error"," This is error "); } But it shows exception and prints this message. Any help would be appreciated!!

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• grab inspect the parameters to "use" and pass on the rest?

  - by JoelFan

  I have a Perl module and I'd like to be able to pick out the parameters that my my module's user passed in the "use" call. Whichever ones I don't recognize I'd like to pass on. I tried to do this by overriding the "import" method but I'm not having much luck. EDIT: To clarify, as it is, I can use my module like this: use MyModule qw/foo bar/; which will import the foo and bar methods of MyModule. But I want to be able to say: use MyModule qw/foo doSpecialStuff bar/; and look for doSpecialStuff to check if I need to do some special stuff at the beginning of the program, then pass qw/foo bar/ to the Exporter's import

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• How do I iterate through table rows and cells in javascript?

  - by GregH

  If I have an HTML table...say <div id="myTabDiv"> <table name="mytab" id="mytab1"> <tr> <td>col1 Val1</td> <td>col2 Val2</td> </tr> <tr> <td>col1 Val3</td> <td>col2 Val4</td> </tr> </table> </div> How would I iterate through all table rows (assuming the number of rows could change each time I check) and retrieve values from each cell in each row from within Javascript?

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• visual studio 2008 keyboard gets locked when editing source controlled files

  - by Rama

  Hi, I am facing a strange issue with editing source controlled files (especially aspx files) using visual studio 2008. when I check out and edit the file, I can edit fine for few seconds and after that keyboard gets locked and I can't type anything (it doesn't affect the files not added to source control). as soon it is locked, if I try to type, the focus shifts to solution explorer and other windows and sometimes it freezes and doesn't respond at all. I tried uninstalling and reinstalling visual studio, reinstalling the source control plug-in. none of it worked. not sure if it is my machine or my profile. Please help if you have any clues. I can't see any other solution for this except rebuilding the machine Thanks, Rama

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• scoket connection issue+php

  - by Abhimanyu

  Hi, I am using PHP socket programming and able to write data to open socket but i have to wait for a long time(or stuck it)for the response or some time getting error like "Maximum execution time of 30 seconds exceeded line number where this code is placed fgets($fp, 128), i have check the server it seems it has sent the response as expected but i am not getting why i m unable to get response.following the code using for socket connection and reading data. functon scoket_connection() { $fp = fsockopen(CLIENT_HOST,CLIENT_PORT, $errno, $errstr); fwrite($fp,$packet); $msg = fgets($fp, 128); fclose($fp) return $msg; } any idea???

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• what is the underlying data structure of a set c++?

  - by zebraman

  I would like to know how a set is implemented in C++. If I were to implement my own set container without using the STL provided container, what would be the best way to go about this task? I understand STL sets are based on the abstract data structure of a binary search tree. So what is the underlying data structure? An array? Also, how does insert() work for a set? How does the set check whether an element already exists in it? I read on wikipedia that another way to implement a set is with a hash table. How would this work?

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• PHP - Using strcpsn() to protect against SQL injection?

  - by MichaelMitchell

  I am making a sort of form validation system and I need to check the SQL database to see if the username is already there. So, my question, is it effective to use a little if statement like this to protect against an attack? if (strcspn($string, "/\?!@#$%^&*()[]{}|:;<>,.\"\'-+=" == strlen($string)){ return true; } So essentially, if the string contains any of these characters, "/\?!@#$%^&*()[]{}|:;<>,.\"\'-+=", then the length will not equal that of the original $string. I am just wondering if this is sufficient to protect, or if there is more that I must do. Thanks.

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• How can I locally debug file permission issues in Visual Studio?

  - by robertc

  I want to debug an ASP.Net website as it attempts to write a file to a directory. When actually deployed this file would possibly not be writeable by the worker process so an error would be thrown, this is not a problem as I just want to catch the error, inform the user and move on. Of course, if I'm debugging on my local machine then I'm an administrator and I have permission to write to the file, so I can't check that I've trapped the correct errors and I can't step through an see where it goes wrong if I haven't. Is there a standard approach to this sort of thing?

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• Function to identify problematic datatypes

  - by Zach

  I just spent several hours debugging some R code, only to discover that the error was due to an Inf that had sneaked in during my calculations. I had checked for NA, but hadn't thought to check for Inf. I wrote the following function to help prevent this situation in the future: is.bad <- function(x){ is.na(x) | is.nan(x) | is.infinite(x) } > is.bad(c(NA, NaN, Inf, -Inf, 0, 1, 1000, 1e6)) [1] TRUE TRUE TRUE TRUE FALSE FALSE FALSE FALSE Are there any other special data types in R I should be aware of?

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• Image size in DB?

  - by user1104916

  I made an application that store Item pictures (jpeg) in SQL Server DB, the use shot pictures with his camera (file size ~ 2 M), in my aaplication I check if picture.Width 800 or picture.Height 600, I resize the picture to 800x600. -- if I export picture from DB, the file size is about 100k, if I open the same picture in photoshop, the image size shows 1.37M. 01-- I want to know the space that takes this picture in my DB. The reason I'm resizing the picture before storing it in my DB, is that I imagine it take a huge space in my DB. 02-- How to resize a picture to keep it' s aspect ratio?

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• Best way to set a default button (or trigger its event in javascript) for an input field, not part of a form

  - by Sheldon Pinkman

  I've got a stand-alone input field, not part of any form. I also got a button, that has some onclick event. When I type something in the input field, and press the Enter key, I want it do effectively press the button, or trigger its onclick event. So that the button is "the input field's default button" so to speak. <input id='myText' type='text' /> <button id='myButton' onclick='DoSomething()'>Do it!</button> I guess I can mess around with the input field's onkeypress or onkeydown events and check for the Enter key, etc. But is there a more 'clean' way, I mean something that associated the button with that input field, so that the button is the 'default action' or something for that field? Note that I'm not inside a form, I am not sending, posting, or submitting something. The DoSomething() function just changes some of the HTML content locally, depending on the text input.

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• simple obj-c naming question

  - by Highstead

  This question is more to figure out how to look up classes and objects in objective-c but i lack the knowledge to figure out how to look this up so i pose the question here. In .Net if i had a MyObject.MyValue the MyValue would be called a property, and I could look this up in MSDN. In java i would check the javadocs online (and that property would have to be a value). With objective-c that is called a ? and if i wanted to look it up i would look where? Example: //Object.??? UIImage.backgroundColor = [UIColor blueColor];

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• How do I determine the cause of Qt's "*** is not a valid Qt plugin" error?

  - by chadjoan

  When I print the value of errorString from my QPluginLoader object, I get this: The file 'C:/pyprojects/test/qsqlpsqld4.dll' is not a valid Qt plugin. I would like to avoid some days worth of doing the time consuming "guess-and-check" methodology that my current internet searches reveal (so far none of them seem relevant anyways). Is there a way for me to get the Qt library itself to tell me why it is refusing to load this plugin? I don't want to guess; I want to know. Context: I am on Windows 7 running Qt 4.8.5 (32-bit, MinGW) and the qsqlpsqld4.dll file is also 32-bit and compiled with MinGW. I am using PySide to interact with Qt.

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