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• What's the best way to stop multiple instances of a Windows app being launched?

  - by John

  Many Windows apps (like Skype or MSN for instance) don't let you start multiple instances, rather trying to run it a 2nd time just leaves the existing version running. Is this typically done in some simple way - the start-menu shortcut is a 'wrapper' app around the main app - or is there some registry magic you can do to delegate the problem to…

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• django: how to use many-to-many relationships in values()?

  - by john

  i need to group results by a field that requires a few joins from the original model: // response_filter_args is created dynamically responses = Response.objects.filter(**response_filter_args) \ .values('customer__tags__tag') \ # django doesn't like this .annotate(average_score=Avg('rating__score')) Response -…

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• Graph coloring with 2 colors

  - by John Graveston

  Hi. I need to check if a given graph can be colored with two colors. EDIT: sorry! submitted by accident

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• MySQL join not returning rows

  - by John

  I'm attempting to create an anti-bruteforcer for the login page on a website. Unfortunately, my query is not working as expected. I would like to test how many times an IP address has attempted to login, and also return the ID of the user for my next step in the login process. However, I'm having a problem with the query... for one thing, this…

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• Odd PHP Error Message

  - by John

  When I run some php code I've written, I get the following message: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'condition, price, name, email) VALUES('Fake Title', 'Fake Subhead', 'Fake Author' at line 1 I do not see anything wrong with…

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• form.has_errors tag not working

  - by John

  Hello, Im using Django 1.2.3. I have login functionality in my site using django.contrib.auth.views.login. The user is able to login after entering correct username and password. But, form.has_errors is not working i.e. if the login credentials entered are incorrect i dont see the error message. My login.html in templates/registration is as…

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• simple question about oracle indexes

  - by john

  If I have an oracle query like below: SELECT * FROM table_a where A = "1", B = "2", C = "3" for this query to pickup one of the indexes of table_a...does the index need to be on all 3 of these columns? What I am asking is: What if Index is on A, B, C, D? What if Index is on B, C? Will the index only be picked when it is on A, B, C?

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• Is this a safe way to reference objects in JavaScript?

  - by John

  If I were to define two objects myDataStore and myDrawer something like this: var myDataStore = function(myObjectRef) { this.myInternalObject = myObjectRef; }; var myDrawer = function(myObjRef) { this.myInternalObject = myObjectRef; }; And if I were to create an object like so: (function(){ var myObject = window.myObject =…

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• Any easy way to delete a user (having many to many relation with role) in acegi, grails?

  - by john

  Hi, In default acegi setting, person and authority have many to many relations. Thus, in addtion to people and authorities, there is a table authotiries-people. To delete a person (a user) I have to delete the related record in authotiries-people first....then come back to delete the record... the problem is: other people are still…

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• C# - How to calculate the current day-of-year?

  - by John M

  Today is 5.27.2010 - this means it is day 147 of this year. How do I calculate that today is 147 based on the current date?

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• python check value not in unicode list

  - by John

  Hi, I have a list and a value and want to check if the value is not in the list. list = [u'first record', u'second record'] value = 'first record' if value not in list: do something however this is not working and I think it has something to do with the list values having a u at the start, how can I fix this? And before…

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• R: How to replace elements of a data.frame?

  - by John

  I'm trying to replace elements of a data.frame containing "#N/A" with "NULL", and I'm running into problems: foo <- data.frame("day"= c(1, 3, 5, 7), "od" = c(0.1, "#N/A", 0.4, 0.8)) indices_of_NAs <- which(foo == "#N/A") replace(foo, indices_of_NAs, "NULL") Error in [<-.data.frame(*tmp*, list, value = "NULL") : …

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• php define variable inside str_replace array

  - by john

  I have a template system, that replaces text such as {HEADER} with the appropriate content. I use an array like this, that replaces the key with the value using str_replace. $array = array("HEADER","This is the header"); foreach($array as $var => $content) { $template = str_replace("{" . strtoupper($var). "}",…

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• Is it possible to use CSS round-corners and still pass validation?

  - by John

  IIRC the situation is that IE simply doesn't support rounded corners, but some other browsers need browser-specific extensions... either FF or web-kit, I don't recall. I'm happy to use it in some cases and let IE fall-back to square corners, but does using browser-extension CSS break validation... I quite like having my…

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• How does Apache 2.0 license differ from GPL?

  - by John

  I don't know much about the full GPL license other than that it's very restrictive to anyone wanting to use GPL anywhere near closed-source code. How does Apache 2.0 license compare with GPL and other license like LGPL, MIT, etc?

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• Problem in creating an Inherited Form ( .NET - C# )

  - by John

  I am creating an inherited form and when i click add, it is showing the message as "Do you want to open or save the file". The file is tmp_auto.tmp file. Give me a solution..Thanks..

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• Problem in creating an Inherited Form ( .NET - C# )

  - by John

  I am creating an inherited form and when i click add, it is showing the message as "Do you want to open or save the file". The file is tmp_auto.tmp file. Give me a solution..Thanks.. Also, it shows "Navigation to the webpage was canceled"

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• Problem in creating an Inherited Form ( .NET - C# )

  - by John

  I am creating an inherited form and when i click add, it is showing the message as "Do you want to open or save the file". The file is tmp_auto.tmp file. Give me a solution..Thanks.. Also, it shows "Navigation to the webpage was canceled"

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• Best way to add/change 1 GET value while keeping others?

  - by John Isaacks

  How can I make a link that justs adds or changes 1 GET var while maintaining all others? I have a page that is created using different GET vars. So it will be like mypage.php?color=red&size=7&brand=some%20brand So I want to have a link that sets it to page=2 or size=8. Whats the easiest way to have a link do…

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• combining two png files in android

  - by John

  I have two png image files that I would like my android app to combine problematically into one png image file and am wondering if it is possible to do so? if so, what I would like to do is just overlay them on each other to create one file. the idea behind this is that I have a handful of png files, some with a…

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• PHP String to Float

  - by John

  I am not familiar with PHP at all and had a quick question. I have 2 variables @pricePerUnit and @invoicedUnits. Here's the code that is setting these to values: $InvoicedUnits = ((string) $InvoiceLineItem->InvoicedUnits); $pricePerUnit = ((string) $InvoiceLineItem->PricePerUnit); If I output this, I get…

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• Java:How to align Jpanels

  - by John

  I have this code but it doesn't work: jPanel1.add(jLabel1); jPanel2.add(jButton1); jPanel2.add(jButton2); jPanel3.add(jPanel1,jPanel1.TOP_ALIGNMENT); jPanel3.add(jPanel2,jPanel2.BOTTOM_ALIGNMENT); setContentPane(jPanel3); pack(); Please tell me why!

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• Javascript switch vs. if...else if...else

  - by John Hartsock

  Guys I have a couple of questions: Is there a preformance difference in Javascript between a switch statement and an if...else if....else? If so why? Is the behavior of switch and if...else if...else different across browsers? (FireFox, IE, Chrome, Opera, Safari)

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• code to check spellings

  - by john

  hi guys, can anyone help me how to write code for checking spellings in android? or can anyone provide me the sites which will be useful to me. thanks in advance any help will be appreciated.

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• Feedback on implementation of function which compares integer signs in Python.

  - by John Magistr

  Hi all. I've made a small function which, given a tuple, compares if all elements in this tuple is of the same sign. E.g., tuple = [-1, -4, -6, -8] is good, while [-1, -4, 12, -8] is bad. I am not sure I've made the smartest implementation, so I know this is the place to ask. def…

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