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• How to integrate camera image into physics engine?

  - by Pedro

  I recently came across this and would like to implement something similar. The basic approach is clear: I have to threshold the image and check if a virtual object collides with the remaining foreground. Instead of implementing the physics myself, I'd like use an engine like Box2D. But how do I integrate the thresholded image into the physics engine so it is possible to interact with virtual objects?

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• Checking for attachments in JavaScript

  - by Sanjay

  Prior to submitting a form, I would like to check if a file has been attached and pop up a warning message saying that a file needs to be attached if it hasn't been. I was wondering how to accomplish this using JavaScript or Prototype or JQuery etc?

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• Detecting if two png images are different

  - by Benjol

  (Context: running autohotkey scripts to try and automate some tests. The plan is to take screenshots and then compare them to 'standard' screenshots to detect if output has changed). Is there a 'clever' way to check if two png images are different? By clever I mean other than comparing them byte by byte? (after having compared their size, obviously)

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• What are the SQL Server query syntax not supported by MySQL?

  - by ANP

  I am working in a project where we are using SQL Server database currently. But recently a decision has been taken that the database will be changed to MySQL. I am not using any stored procedures, views, triggers, user defined functions, etc. But I think even then some queries written for SQL Server will not be supported by MySQL. Can anyone help: what are the things that I have to check (and change) so that all the queries will work properly for MySQL also?

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• Knowing The language used in a form

  - by Shinigami

  Hi, I'm working on a site that in some of its forms , a specific language is needed to be used. (sth like a Dictionary).I want to know if there is a Tag in Javascript/Html that i can check the language?for example if i need the input in japanese and user gave me an English word,it finds out and gives an error.

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• Validation library for PHP/mysql

  - by Industrial

  Hi! Is there any lightweight validation library available for PHP that easily can check if a specific string or value is valid for a known database type - Something like this: if (is_MEDIUMINT($var)) { $this->db->insert($anothervar); } Thanks!

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• Who will prosecute if GPL code is misused

  - by udpsunil

  I have seen using of GPL code in proprietary software which is sold to customers. It seems so wrong that they are not releasing under GPL and not contributing to the Community Is there any authority to check the misuse of GPL? How misuse of GPL can be reported?

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• Can IF be used to start a MySQL query?

  - by Littledot

  Hi there, I have a query that looks like this: mysql_query("IF EXISTS(SELECT * FROM predict WHERE uid=$i AND bid=$j) THEN UPDATE predict SET predict_tfidf=$predict_tfidf WHERE uid=$i AND bid=$j ELSE INSERT INTO predict (uid, bid, predict_tfidf) VALUES('$i','$j','$predict_tfidf') END IF")or die(mysql_error()); But it dies and mysql tells me to check the syntax near IF EXISTS(....) Can we not use an IF statement to start a mysql query? Thank you in advance.

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• How can i optimize this python code

  - by RandomVector

  def maxVote(nLabels): count = {} maxList = [] maxCount = 0 for nLabel in nLabels: if nLabel in count: count[nLabel] += 1 else: count[nLabel] = 1 #Check if the count is max if count[nLabel] > maxCount: maxCount = count[nLabel] maxList = [nLabel,] elif count[nLabel]==maxCount: maxList.append(nLabel) return random.choice(maxList) nLabels contains a list of integers. The above function returns the integer with highest frequency, if more than one have same frequency then a randomly selected integer from them is returned. E.g. maxVote([1,3,4,5,5,5,3,12,11]) is 5

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• Java Date & Time of Day

  - by Gaz

  Hi, I have an application that passes in java.util.Date. I want to check whether this date is within a specified time of day (e.g. between 10:30 & 11:30), I don't care about the date, just the time of day. Can anyone show me a simple way to do this? Thanks

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• comparing 2 arrays on perl

  - by qrbaQ

  could someone provide a good /nice solution in perl for comparing 2 arrays (a and b ) which check if every element on array a is founded on array b (and founded only once on array b) ?

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• The least amount of code possible for this MySQL query?

  - by ddan

  I have a MySQL query that: gets data from three tables linked by unique id's. counts the number of games played in each category, from each user and counts the number of games each user has played that fall under the "fps" category It seems to me that this code could be a lot smaller. How would I go about making this query smaller. http://sqlfiddle.com/#!2/6d211/1 Any help is appreciated even if you just give me links to check out.

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• access: LIKE conditional formatting question

  - by every_answer_gets_a_point

  i am doing conditional formatting on a report in access i need to check if a certain string exists in a field as the condition in conditional formatting. something like this: [field_name] like '%something%' will this kind of condition work?

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• Easy way to add custom prerequisite in clickonce publish (VS 2010)

  - by Maciej

  I would like to add Infragistics dlls as custom prerequisite when publishing my project. I've read about that: http://msdn.microsoft.com/en-us/library/aa730839%28VS.80%29.aspx But this seems to be a bit complicated... I wonder if exists a bit simple way to archive that (eg by passing URL to setup.exe or such) ? EDIT This Might be also interesting: http://www.codeproject.com/KB/aspnet/Add_Custom_Prerequisite.aspx?msg=2520811 will check and let you know...

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• C# Performance on Errors

  - by pm_2

  It would appear that catching an error is slower that performing a check prior to the error (for example a TryParse). The related questions that prompt this observation are here and here. Can anyone tell me why this is so - why is it more costly to catch an error that to perform one or many checks of the data to prevent the error?

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• Handling large numbers of sockets with .NET

  - by Dreaddan

  I'm looking at writing a application that need to be able to handle in the region of 200 connections / sec and was wondering if C# and .NET will handle this or if I need to really be looking at C++ to do this? It looks like SocketAsyncEventArgs may be the way to go but thought id check before I plough in to it. Each transaction should only last less than a second but could take up to 15 seconds each if that makes any difference.

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• Iphone SDK- How to insert a banner in my app

  - by Dave

  I have a tableview that my app shows when it loads, I would like to somehow put a banner at the bottom that if connceted to the internet will check my server for any new image files and if there are it will replace the current one and if not it will just leave it. That way I can constantly display messages to my users - sort of like in Doodle Jump. How could I achieve this? Thanks

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• What are the techniques to implement evaluation period and ensure it is not tempered?

  - by understack

  I've a simple product installer for windows OS, which could be evaluated for a month. What are the techniques I can use so that this piece of software is not used after a month? I've seen that several s/w use system date to check it but it's very primitive and easily forge-able. I think a key based system based on registry or online verification could be an option but I don't know much about these. Please help.

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• How Would you Mimic an Arbitrary Directory Structure with Rails Routes?

  - by viatropos

  I want to be able to map Google Docs' folder system to urls in my application and am just wondering how I can say "route, I want you to match an arbitrary set of nodes, and the last one is the file (or possibly a directory, I can check in the controller)". So I could do things like: www.mysite.com/documents/folder1/childfolderA/document www.mysite.com/documents/root-level-doc Can the routes.rb file do something like this?

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• Is any tool can help create/fix a table into normal form?

  - by WuYi

  Hi,I know the importance of being normal in database design. But many people always lives with broken windows. Is any tool can help create/fix a table to normal form? I mean to force developer create table in normal form, or help to check if the table being normal base on existed data within the table. Thanks……

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• Create Oracle Function by checking increment value

  - by Atul

  How to check in Oracle Function whether value is increasing in particular field for last 3 year or not. Suppose one table is company and if we want to consider only values if profit of past 3 year of company is in increasing manner.

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• Command prompt in debug mode for Eclipse? (OpenCV + Eclipse + Win7)

  - by Tony

  I am a beginner for Eclipse. I now have Eclipse C/C++ IDE with OpenCV library running on Windows 7. So far it works after spending hours trying to get it running. But then I realize that Eclipse does not pop up a command prompt as VS2010 does while debugging. And moreover Eclipse's debug mode is just stuck in there and refuse to output anything. But if the code doesn't involve the OpenCV things it works again. Below is the code I use for testing. It captures images from webcam and output it to the screen. The infinite loop (until you press 'q') makes sure it constantly grabs new inputs from the camera. I browsed through the workspace and run the exe just compiled and it worked flawlessly. So I don't think there's anything wrong in the code (it's an example code anyway In brief, can I just pop up a command prompt window in debug mode? And why is Eclipse console stuck when the code involves some OpenCV functions? #include <stdio.h> #include <stdlib.h> #include <tchar.h> #include <cv.h> #include <cxcore.h> #include <highgui.h> #include <iostream> int _tmain(int argc, _TCHAR* argv[]) { CvCapture *capture = 0; IplImage *frame = 0; int key = 0; /* initialize camera */ capture = cvCaptureFromCAM( 0 ); /* always check */ if ( !capture ) { printf("Cannot open initialize webcam!\n"); return 1; } /* create a window for the video */ cvNamedWindow( "result", CV_WINDOW_AUTOSIZE ); while( key != 'q' ) { /* get a frame */ frame = cvQueryFrame( capture ); /* always check */ if( !frame ) break; /* display current frame */ cvShowImage( "result", frame ); /* exit if user press 'q' */ key = cvWaitKey( 1 ); } /* free memory */ cvDestroyWindow( "result" ); cvReleaseCapture( &capture ); return 0; }

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• How do I use a file grep comparison inside a bash if/else statement?

  - by openid_kenja

  When our server comes up we need to check a file to see how the server is configured. We want to search for the following string inside our /etc/aws/hosts.conf file: MYSQL_ROLE=master Then, we want to test whether that string exists and use an if/else statement to run one of two options depending on whether the string exists or not. What is the BASH syntax for the if statement? if [ ????? ]; then #do one thing else #do another thing fi

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• I want to create an expression for querystrings, this stuff is hard!

  - by jkirkerx

  I want to extract some keywords out of a query string for a search application in asp.net. I decoded the url string first, so it's plain text I have this to start with, but I want to add a keyword group I'd like to trim off the stuff for pure words, but not sure if that's possible I also have a long list of possible query string value fields that I want to check against ?q= @q= ?qs= &qs=

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• PHP Is Array Item In Variable

  - by zuk1

  I have an array and a variable, I want to check if any of the array items occur in the variable. I presume I somehow use strstr()?

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