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• Merge two bytes in java/android

  - by Shane

  Hi, I have a frame of 22 bytes. The frame is the input stream from an accelerometer via bluetooth. The acceleromter readings are a 16 bit number split over two bytes. When i try to merge the bytes with buffer[1] + buffer[2], rather than adding the bytes, it just puts the results side by side. so 1+2 = 12. Could someone tell me how to combine these two bytes to obtain the original number. (btw the bytes are sent little endian) Thanks

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• Is it valid for RSS feeds to include images with relative paths?

  - by Brian Armstrong

  I have an app which reads lots of RSS feeds. Someone added a feed recently that includes images in the html portion with relative URLS (i.e. it didn't include the http://www.domain.com/ part in front). Is this valid html for an RSS feed? I thought not, but I tried adding the feed to my Google reader and it picked up the images correctly, so they must be doing something smart where they guess the domain based on the feed's url parameter or something. Even if it's not valid, how common is it to see feeds like this in the wild? To display it correctly would require you to parse the html in the feed and find/replace parts of it to insert full URL's, so this seems wrong. But wanted to double check.

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• Why is the destructor called when the CPython garbage collector is disabled?

  - by Frederik

  I'm trying to understand the internals of the CPython garbage collector, specifically when the destructor is called. So far, the behavior is intuitive, but the following case trips me up: Disable the GC. Create an object, then remove a reference to it. The object is destroyed and the __del__ method is called. I thought this would only happen if the garbage collector was enabled. Can someone explain why this happens? Is there a way to defer calling the destructor? import gc import unittest _destroyed = False class MyClass(object): def __del__(self): global _destroyed _destroyed = True class GarbageCollectionTest(unittest.TestCase): def testExplicitGarbageCollection(self): gc.disable() ref = MyClass() ref = None # The next test fails. # The object is automatically destroyed even with the collector turned off. self.assertFalse(_destroyed) gc.collect() self.assertTrue(_destroyed) if __name__=='__main__': unittest.main() Disclaimer: this code is not meant for production -- I've already noted that this is very implementation-specific and does not work on Jython.

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• web2py error while using distinct in the queries

  - by Steve

  Hi, I am using web2py with GAE. While using some of the queries which has a distinct clause, GAE throws out an error.I have pasted the Traceback. Can someone please help me out with this. In FILE: /base/data/home/apps/panneersoda/1.341206242889687944/applications/init/controllers/default.py Traceback (most recent call last): File "/base/data/home/apps/panneersoda/1.341206242889687944/gluon/restricted.py", line 173, in restricted exec ccode in environment File "/base/data/home/apps/panneersoda/1.341206242889687944/applications/init/controllers/default.py:profileview", line 263, in <module> File "/base/data/home/apps/panneersoda/1.341206242889687944/gluon/globals.py", line 96, in <lambda> self._caller = lambda f: f() File "/base/data/home/apps/panneersoda/1.341206242889687944/applications/init/controllers/default.py:profileview", line 97, in profileview File "/base/data/home/apps/panneersoda/1.341206242889687944/gluon/contrib/gql.py", line 675, in select (items, tablename, fields) = self._select(*fields, **attributes) File "/base/data/home/apps/panneersoda/1.341206242889687944/gluon/contrib/gql.py", line 624, in _select raise SyntaxError, 'invalid select attribute: %s' % key SyntaxError: invalid select attribute: distinct Thanks

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• Signal amplitude against time in Java

  - by wsr74ws84

  I'm racking my brain in order to solve a knotty problem (at least for me). While playing an audio file (using Java) I want the signal amplitude to be displayed against time. I mean I'd like to implement a small panel showing a sort of oscilloscope (spectrum analyzer). The audio signal should be viewed in the time domain (vertical axis is amplitude and the horizontal axis is time). Does anyone know how to do it? Is there a good tutorial I can rely on? Since I know very little about Java, I hope someone can help me.

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• Python sys.argv lists and indexes

  - by Fred Gerbig

  In the below code I understand that sys.argv uses lists, however I am not clear on how the index's are used here. def main(): if len(sys.argv) >= 2: name = sys.argv[1] else: name = 'World' print 'Hello', name if __name__ == '__main__': main() If I change name = sys.argv[1] to name = sys.argv[0] and type something for an argument it returns: Hello C:\Documents and Settings\fred\My Documents\Downloads\google-python-exercises \google-python-exercises\hello.py Which kind of make sense. Can someone explain how the 2 is used here: if len(sys.argv) >= 2: And how the 1 is used here: name = sys.argv[1]

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• CAN Controller DLL with Java Application. Unable to open CAN port.

  - by Joseph Lim

  I am creating a Java application that controls a Controller Area Network (CAN) controller via a vendor-supplied can.dll file. can.dll contains a function bool openPort(DWORD memAddr) that allows the application to establish connection with the CAN controller. I wrote a C++ test application, loaded can.dll via LoadLibrary and found this function to be working as it should, i.e. it returns true. However, in my Java application, calling this via JNI or JNA returns false. I hope someone can help me with this problem as I have been trying to fix this problem for more than a week. Thanks :) JL

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• iPad to iPhone?

  - by Brodie4598

  Hello - I have written a tab based iPad application which has done well. I never intended for it to be an iPhone application because the content it displays really doesnt lend itself to such a small screen. However, I have been getting a lot of requestes for the application to be compatible with iPhones as well. Can someone point me in the direction of some documentation that may help me figure out how to convert my app. I presume it's not so simple as having aanother set of XIB files for iPhone and just have it display them if the app is running on a phone...

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• possible to recreate xml out of ActionScript?

  - by Andy

  Hi, I got stuck with an SWF which has ActionScript in it and should use some xml. The problem is, I cannot edit the SWF by decompiling it and compile it again, it simply doesn't work... Adobe Flash CS4 rebuilds the thing, but after I press CTRL+ENTER I get a lot of runtime errors (probably something to do with AS <- AS2 <- AS3 and don't know how to fix that). So the question is: can I reconstruct how the xml should look like? I am able to view all the actionscript code with Flash Decompiler Gold and ain't gettin much smarter. Maybe I could post the code if someone desire it. thanks

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• emacs windows, distribute the width through the frame

  - by Gauthier

  I used once a very nice emacs function that set all my windows (emacs windows, not frames) width evenly. If you open emacs and do C-x 3 twice in a row, you get three vertical windows. Then running the function I am looking for makes the width of these windows the same. I can't for the life of me find this function again. Wouldn't someone help me to: find the name of the function give me the keyboard shortcut if any tell me what I should have done to find the answer by myself Thanks!

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• Consume restful webservice through web proxy

  - by Chico

  Hello, I'm trying to consume a restful webservice in java using the Apache Wink framework through my school web proxy requiring authentification ClientConfig clientConfig = new ClientConfig(); clientConfig.proxyHost("proxy.school.com"); clientConfig.proxyPort(3128); //nothing to set username and password :( RestClient client = new RestClient(clientConfig); Resource resource = client.resource("http://vimeo.com/api/v2/artist/videos.xml"); String response = resource.accept("text/plain").get(String.class); I've also tried to use the BasicAuthSecurityHandler but it seems to be used to authenticate directly to a web server, not the web proxy BasicAuthSecurityHandler basicAuthHandler = new BasicAuthSecurityHandler(); basicAuthHandler.setUserName("username"); basicAuthHandler.setPassword("password"); config.handlers(basicAuthHandler); It still fail with a HTTP 407 error code : Proxy Authentication Required. I've googled the best I could, nothing came up better to consume a webservice from a Java client through a web proxy, if someone has another idea, feel free to respond

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• PHP secure logon script - md5 hash is not matching the hash i wrote to the database in a previous sc

  - by Chris Sobolewski

  I am trying to cobble together a login script in PHP as a learning project. This is the code for my database write when the user registers. Both of these values are written to the database. $this->salt = md5(uniqid()); $this->password = md5($password.$salt); Upon logging in, the following function is fired. For some function challengeLogin($submittedPassword, $publicSalt, $storedPassword){ if(md5($submittedPassword.$publicSalt) == $actualPassword){ return 0; }else{ return 1; }; } Unfortunately, on stepping through my code, the two values have never equaled. Can someone help me understand why?

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• Image surrounded by text in WPF

  - by niao

  Greetings, I have some control which display bunch of textblocks and image. I would like the image to be surrounded by text. I have already implemented some functionality by using FlowDocument and custom bindable run control. (These controls are included inside user control). When I generate lots of these controls in treeview, application goes into infinite loop. I asked on forums before about this problem and the answer was that it can be WPF issue. Howver when I removed bindable run from my user control, problem dissappeared. Now I am trying to implement other solution where image will be surrounded by text. Can someone please help me? EDIT: Generally i would like to achieve something like this

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• Spring struts and forms

  - by Kiva

  Hi guy, I need to integrate struts with spring for a project. I read the doc to ingrate struts and it's ok for classic beans but I have a problem for my forms. I have a form like this in my struts-config.xml: <form-beans> <form-bean name="creationForm" type="org.apache.struts.validator.DynaValidatorActionForm" > <form-property name="libelle" type="java.lang.String" /> <form-property name="quantite" type="java.lang.String" /> <form-property name="prix" type="java.lang.String" initial="10" /> </form-bean> But it's strange for me to have a "type" in struts-config because it's spring which manages beans. I don't found anything in the doc to manage forms by spring and the attribute "type" is mandatory for form in struts-config. Someone can help me please ?

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• Do employers like to see (programming/computer science) blogs?

  - by incrediman

  I'm wondering if having a blog (with most posts concentrating on computer science/programming) would be a good idea with regards to getting a job. Would a potential employer like to see something like that? What about someone hiring a freelancer? I'd especially appreciate: Responses from people who hire programmers or computer scientists for full-time jobs. Responses from people who hire freelance programmers. Responses from people who have such such blogs and have felt their (either negative or positive) effects. Thanks! I felt this would probably be best marked as community wiki - please let me know if I was mistaken.

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• Python: Get items at depth? (set library?)

  - by Mark

  I have a nested list something like this: PLACES = ( ('CA', 'Canada', ( ('AB', 'Alberta'), ('BC', 'British Columbia' ( ('van', 'Vancouver'), ), ... )), ('US', 'United States', ( ('AL', 'Alabama'), ('AK', 'Alaska'), ... I need to retrieve some data out of it. If depth is 0 I need to retrieve all the countries (and their codes), if depth == 1, I need to retrieve all the states/provinces, if depth == 2 I need to retrieve all the cities... and so forth. Is there some set library for doing stuff like this? Or can someone point me in the right direction? I started coding up a solution only to realize it wouldn't work for levels deeper than 1 because you have to go in and out of each list...

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• recursion tree and binary tree cost calculation

  - by Tony

  Hi all, I've got the following recursion: T(n) = T(n/3) + T(2n/3) + O(n) The height of the tree would be log3/2 of 2. Now the recursion tree for this recurrence is not a complete binary tree. It has missing nodes lower down. This makes sense to me, however I don't understand how the following small omega notation relates to the cost of all leaves in the tree. "... the total cost of all leaves would then be Theta (n^log3/2 of 2) which, since log3/2 of 2 is a constant strictly greater then 1, is small omega(n lg n)." Can someone please help me understand how the Theta(n^log3/2 of 2) becomes small omega(n lg n)?

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• where can I find useful VB.NET web development videos ?

  - by ahmed

  Hi , I have tried Asp.Net but they have minimum sets of tutorials and videos. I am looking for a video tutorials like pluralsight training videos which is not free. But I am looking for free training videos for Vb.Net/webforms and SQL "CRUD", Sql DataBinding videos, runtime designing , runtime databinding and all. Thanking you all in advance. And also I am sorry if this is a repeat question. And one thing which I like to say is why do people go first with winforms when someone says vb.net ? Is there any specific way to say for webforms ? OR how should I say it for web development in VB?

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• TFS and team project portal question

  - by DotnetDude

  The team explorer for my project looks like this: mytfsserver\mycollection -- Project 1 solution -- Project 2 solution -- Project 3 solution When I right click on one of the solutions and do a "Show Project Portal", I see the following hierarchy: mycollection - WSS site Project 1 site with dashboard (appears to be a MOSS site) Project 2 site with dashboard (appears to be a MOSS site) Project 3 site with dashboard (appears to be a MOSS site) Are the dashboard sites MOSS sites? If I want to create a wiki, do I have to create a subsite with the wiki template under each of the Project sites? Can someone point me to a document/video that talks about the sites that area created by TFS by default?

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• Watin testing of FckEditor

  - by Iyyengar

  I have been working on the integration testing of a webapp using watin. The webapp uses fckeditor as one of the richtext controls. Here is the piece of html of the viewsource of my webapp that includes fckeditor iframe id="ctl00_HeaderMain_txtSafetyNetDescription___Frame" src="/FCKEditor/editor/fckeditor.html?InstanceName=ctl00_HeaderMain_txtSafetyNetDescription&Toolbar=myApp" width="100%" height="200px" frameborder="no" scrolling="no" /iframe By using the watin script ... i am able to get the frame object with the following code. Frame frame = ie.Frame(Find.ById("ctl00_HeaderMain_txtSafetyNetDescription___Frame")) ; Now I want to write some text to the fckeditor. But i am not sure how to write to the fckeditor as it is a frame -- can someone help me on this. Thanks. Iyyengar.

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• Why is this not a bug in qmail?

  - by jemfinch

  I was reading DJB's "Some thoughts on security after ten years of Qmail 1.0" and he listed this function for moving a file descriptor: int fd_move(to,from) int to; int from; { if (to == from) return 0; if (fd_copy(to,from) == -1) return -1; close(from); return 0; } It occurred to me that this code does not check the return value of close, so I read the man page for close(2), and it seems it can fail with EINTR, in which case the appropriate behavior would seem to be to call close again with the same argument. Since this code was written by someone with far more experience than I in both C and UNIX, and additionally has stood unchanged in qmail for over a decade, I assume there must be some nuance that I'm missing that makes this code correct. Can anyone explain that nuance to me?

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• Does mod_rewrite in subdirectories' .htaccess override higher levels?

  - by Ryan

  I'm using mod_rewrite to map my old directory structure to a new one. I have the following rule in my top-level .htaccess file, and it works: RewriteEngine On RewriteCond %{REQUEST_URI} /blog/archives/(.*) RewriteRule ^.*$ /archives/%1 [L,R=301] As you can guess, this takes http://example.com/blog/archives/00001.php and redirects it to http://example.com/archives/00001.php. But when I add these rewrite rules to the .htaccess file in the /blog directory RewriteEngine on RewriteRule atom.xml$ /atom.xml [L,R=301] the top-level redirect no longer works. If I move the rule in the /blog .htaccess file to the top-levle file both rules work. Can someone explain what is happening here?

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• How to deny payment via PayPal IPN?

  - by Nick

  Hello all, I need to create dynamic 'Pay Now' buttons on my site, and PayPal says the way to do this is via an HTML FORM with preset variables for the price, currency, and item of the purchase. I use PayPal IPN to notify me when a payment has complete. However, what's to stop someone from modifying the query parameters of the Pay Now button to change the price? Some people have told me to redirect the button through a PHP file that sends you to a PayPal payment page with the parameters in place, but the price could just as easily be manipulated in the Web browser's address bar. My question is, how can I deny a payment if the information I receive from PayPal's IPN service is invalid (if the price doesn't match our records)? I'm quite confused and couldn't find any documentation on what I'm looking for. Hopefully, you guys can help. Thanks!

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• Glew in VS 2010: unresolved external symbol __imp__glewInit

  - by NoviceCai

  I am learning OpenGL by following the redbook. When I come to around page 90, I need use glGenBuffers(); Then I need install "glew". By following the steps in www.cs.uiowa.edu/~cwyman/classes/common/howto/winGLUT.html I download glew.zip from glew.sourceforge.net/ and unpack the files. I put glew.h in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Include and put glew32.lib in C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Lib and put glew32.dll in C:\Windows\System32. After that, I build my project in VS 2010 and in Linker-input, I add dependencies glew32.lib. But when I build it, I have error unresolved external symbol _imp_glewInit I spend whole day to search solutions, but did not find one. Hope someone can help me with this.

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• What exactly is a Monad?

  - by WeNeedAnswers

  Can someone please explain to me what a Monad is. I think I grasp Monoids and I grasp that they basically control the input of state into a system. I just look at the text in Haskell and glaze over. A simple example in python would be great. My current understanding is that a Monoid is a procedural piece of code that needs to be read from top to bottom in sequence with the output being the input for the function. I think that I may even got that wrong, but hey I am here to learn.

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