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When to best implement a I2C driver module in Linux

- by stefangachter

I am currently dealing with two devices connected to the I2C bus within an embedded system running Linux. I am using an exisiting driver for the first device, a camera. For the second device, I have successfully implemented a userspace program with which I can communicate with the second device. So far, both devices seem to coexist happily. However, almost all I2C devices have their own driver module. Thus, I am wondering what the advantages of a driver module are. I had a look at the following thread... http://stackoverflow.com/questions/149032/when-should-i-write-a-linux-kernel-module ... but without conclusion. Thus, what would be the advantage of writing a I2C driver module over a userspace implementation? Regards, Stefan

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SQLite multi process access

- by Nicolas

Hello, We are using SQLite in a multi processes and multi threaded application. The SQLite database files are encrypted using the embedded SQLite encryption. The FAQ states that SQLite should be able to manage multi process accesses using locks mechanism. We are experiencing a strange problem: When many threads are accessing the same database file, sometime constrains violations occur, more specifically - a field with a unique constrain is getting duplicate values after calling "insert or replace" statement. It happens quite often now, that we are using the encryption. Before we started using SQLite encryption we did not notice such a behavior. Are there any specific known issues with this?

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Java library to encode / decode AMF

- by Ceilingfish

Hi chaps, I currently have a Java server that talks to a Flash client by passing JSON encoded data over a binary socket connection. Is there a way on either side to encode / decode packets as AMF instead of JSON? It seems to me that there should be some native support in Flash player for doing this? All the implementations I have found of AMF serialization seem to be embedded inside an application framework. Simiarly so, does anyone know if it's possible to decode AMF packets independently of a connection implementation in Flash?

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Pass variable to Google Custom Search Engine

- by Matt

Is it possible to pass a search variable into the Google Custom Search Engine that I have embedded on my website? I can get the search engine to work, but I can't pass it a term via POST (it's coming from a search button on other pages of the website) I tried to hack the code I found here: http://code.google.com/apis/ajax/playground/?exp=search#hello_world And this is what I have so far... ($q is the term I am passing to it) <script type="text/javascript"> google.load('search', '1', {language : 'en'}); function OnLoad() { var customSearchControl = new google.search.CustomSearchControl('***my key****'); customSearchControl.setResultSetSize(google.search.Search.FILTERED_CSE_RESULTSET); customSearchControl.draw('cse'); searchControl.execute("$q"); } google.setOnLoadCallback(OnLoad); </script> Thanks

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How should I store an Java Enum in JavaDB?

- by Jonas

How should I store an Java Enum in JavaDB? Should I try to map the enums to SMALLINT and keep the values in source code only? The embedded database is only used by a single application. Or should I just store the values as DECIMAL? None of these solutions feels good/robust for me. Is there any better alternatives? Here is my enum: import java.math.BigDecimal; public enum Vat { NORMAL(new BigDecimal("0.25")), FOOD(new BigDecimal("0.12")), BOOKS(new BigDecimal("0.06")), NONE(new BigDecimal("0.00")); private final BigDecimal value; Vat(BigDecimal val) { value = val; } public BigDecimal getValue() { return value; } } I have read other similar questions on this topic, but the problem or solution doesn't match my problem. Enum storage in Database field, Best method to store Enum in Database, Best way to store enum values in database - String or Int

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How to change out-of-focus text selection color in Xcode?

- by Jackson

Okay, I'll bite. I've got really pleasant code/window colors set up in Xcode. Ordinarily, my selection color is very visible. When I am doing a project search and iterating through the results, however, the results list stays in focus and the found text remains out of focus, using a different background color. This color is extremely hard to detect, especially when the text is embedded in a larger code block and the view is shifting around as it scrolls to the results. Here's an example: Left side is in focus (just normal selection), right side is out of focus (during project find) Often it takes a few seconds to find where the heck the selected text is. Unless I'm just missing it, Xcode seems to offer no way to change this particular selection color. Interestingly, it also doesn't seem to follow the selection color from the Appearance panel. Does anyone know a way to change this color or force it to be more visible, short of changing my entire color scheme around?

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Double-Escaped Unicode Javascript Issue

- by Jeffrey Winter

I am having a problem displaying a Javascript string with embedded Unicode character escape sequences (\uXXXX) where the initial "\" character is itself escaped as "\" What do I need to do to transform the string so that it properly evaluates the escape sequences and produces output with the correct Unicode character? For example, I am dealing with input such as: "this is a \u201ctest\u201d"; attempting to decode the "\" using a regex expression, e.g.: var out = text.replace('/\/g','\'); results in the output text: "this is a \u201ctest\u201d"; that is, the Unicode escape sequences are displayed as actual escape sequences, not the double quote characters I would like.

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Cross-database transactions from one SP

- by Michael Bray

I need to update multiple databases with a few simple SQL statement. The databases are configurared in SQL using 'Linked Servers', and the SQL versions are mixed (SQL 2008, SQL 2005, and SQL 2000). I intend to write a stored procedure in one of the databases, but I would like to do so using a transaction to make sure that each database gets updated consistently. Which of the following is the most accurate: Will a single BEGIN/COMMIT TRANSACTION work to guarantee that all statements across all databases are successful? Will I need multiple BEGIN TRANSACTIONS for each individual set of commands on a database? Are transactions even supported when updating remote databases? I would need to execute a remote SP with embedded transaction support. Note that I don't care about any kind of cross-database referential integrity; I'm just trying to update multiple databases at the same time from a single stored procedure if possible. Any other suggestions are welcome as well. Thanks!

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Is javac enough to build an OSGi bundle?

- by Chatanga

To produce a bundle from source using a tool such as javac, you need to provide it with a linear classpath. Unfortunately, it won't work in some situations still perfectly legal from an OSGi point of view: dependencies with embedded JAR in them; same packages contained by different dependencies. Since javac doesn't understand OSGi metadata, I won't be able to simply but the dependencies in a classpath. A finer package grained approach seems necessary. How this problem is addressed by people using OSGi in an automated process (continuous integration)? Strangely, there is a lot of resources on the web on how to create bundle JAR (creating the metadata, creating the JAR) provided you have the classes/inner JAR to put inside, but very few things on how actually get theses classes compiled.

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What messaging technologies in windows-ce for gauranteed msg delivery?

- by Aidanapword

All, We are building a windows-ce (6.0R3) based device that requires guaranteed and audit-ready message delivery (including store & forward) up to and down from the cloud. I have been looking for choices beyond: MSMQ a proprietary solution (what our prototype device is using) AMQP (research on using this in our context is now starting) ... are there any others? We will be transporting sensitive data (who isn't?!?!) over a public network, and large scale options are required. Anything running on an embedded device will be performance sensitive too. Thanks! Aidanapword

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Variable declarations following if statements

- by Anthony Pegram

An issue came up on another forum and I knew how to fix it, but it revealed a feature of the compiler peculiar to me. The person was getting the error "Embedded statement cannot be a declaration or labeled statement" because they had a declaration of a variable following an if statement with no brackets. That was not their intent, but they had commented out the line of code immediately following the if statement, which made the variable declaration the de facto line of code to execute. Anyway, that's the background, which brings me to this. The following code is illegal if (true) int i = 7; However, if you wrap that in brackets, it's all legal. if (true) { int i - 7; } Neither piece of code is useful. Yet the second one is OK. What specifically is the explanation for this behavior? I have a hypothesis, but I'd rather ask the brilliant people on stackoverflow.

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match at the beginning of any line, including the first

- by JoelFan

According the the Perl documentation on regexes: By default, the "^" character is guaranteed to match only the beginning of the string ... Embedded newlines will not be matched by "^" ... You may, however, wish to treat a string as a multi-line buffer, such that the "^" will match after any newline within the string ... you can do this by using the /m modifier on the pattern match operator. The "after any newline" part means that it will only match at the beginning of the 2nd and subsequent lines. What if I want to match at the beginning of any line (1st, 2nd, etc.)?

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SQL Server 2008 automated database drop, create and fill

- by lox

For the database in my project I have a drop/create script for the database, a script for creating tables and SPs and an Access 2003 .mdb file with some exported values. To set up the database from scratch I can use my SQL management studio to first run one script, then the other and lastly manually run the sort of tedious import task. But I would like to do this as automated as possible. Hopefully something like putting the three files in a folder along with a fourth script to execute. Looking something like: run script "dropcreate.sql" run script "createtables.sql" import "values.mdb" How is this done? I hope to avoid using SSIS and the like. The tricky this is of course the import of data, where I can't seem to find a simple way. It is also important that the files a left as they are and not embedded into anything.

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Uploading a picture to a album using the graph api

- by kielie

Hi guys, I am trying to upload an image to a album, but it's not working, here is the code I am using, $uid = $facebook->getUser(); $args = array('message' => $uid); $file_path = "http://www.site.com/path/to/file.jpg"; $album_id = '1234'; $args['name'] = '@' . realpath($file_path); $data = $facebook->api('/'. $album_id . '/photos', 'post', $args); print_r($data); This code is in a function.php file that gets called when a user clicks on a button inside of a flash file that is embedded on my canvas, so basically what I want it to do is, when the flash takes a screen shot and passes the variable "image" to the function, it should upload $_GET['image'] to the album. How could I go about doing this? Thanx in advance!

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GXT/GWT html content reloads when switching tabs

- by Ben

I am working on a GXT/GWT project. I have two tabs in which content is set based on selections from a drop down menu. The content in one tab is an embedded video (Google Video or youtube video) The problem is that when switching tabs, the video reloads and starts from the beginning again. What I would like is to be able to switch tabs and have the video continue to play or pause when the focus switches to another tab. Any ideas, as always, are greatly appreciated. Cheers, Ben

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ptrace'ing of parent process

- by osgx

Hello Can child process use the ptrace system call to trace its parent? Os is linux 2.6 Thanks. upd1: I want to trace process1 from "itself". It is impossible, so I do fork and try to do ptrace(process1_pid, PTRACE_ATTACH) from child process. But I can't, there is a strange error, like kernel prohibits child from tracing their parent processes UPD2: such tracing can be prohibited by security policies. Which polices do this? Where is the checking code in the kernel? UPD3: on my embedded linux I have no errors with PEEKDATA, but not with GETREGS: child: getregs parent: -1 errno is 1, strerror is Operation not permitted errno = EPERM

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Super Cam iphone app how do they make it possible?

- by Silent

there is an iphone app called supercam and you can get it through the app store free. This app features a way to connect your webcam or dv cam that is connected on the internet, you could set up the ip address and enter the data on the app and it will connect to your online camera. the thing is that they have the video stream and it looks like they embedded the video in a uiview or webview at the bottom they have buttons to choose from all the cameras you have set up. so this is different from other video streaming apps because it does not play the video from the full screen mode (MPMediaPlayer API) would there be any tutorials about this or somehow take reverse engineer this?

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What are the programming religious wars of the generations before our current generation?

- by Christopher Altman

Being 32 years old, I did not follow debates in programming, language design, and platforms in the 1960s, 1970s, 1980s, and most of the 1990s. I sometimes hear glimpse of what the major debates were and how they turned the course of history. It makes me wonder what I take for granted. I am curious, what were the debates. The ones I know are: Procedural vs. Object Orientated Programming Lisp vs. C Software vs. Chips with Embedded Code

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Performance of fopen vs stat

- by Alex Marshall

Hello, I'm writing several C programs for an embedded system where every bit of performance we can squeeze out will matter. Part of that is accessing log files. When determining if a file exists, is there any performance difference between using open / fopen, and stat ? I've been using stat on the assumption that it only has to do a quick check against the file system, whereas fopen would have to actually gain access to a file and manipulate internal data structures before returning. Is there any merit to this ?

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Publish to Facebook Stream in as3

- by Kid Adiran

Hi, I am trying to publish to a users stream when they click a share button in my flash app that i have living in a tab on a fan fan. I basically have my swf embedded on a page that has a java script function that calls the facebook share dialogue. Here is what i got so far: // flash embedd <fb:fbjs-bridge/> // share function <script> function publishfeed() { var attachment = {'media':[{'type':'image','src':'http://bit.ly/AJTnf','href':'http://bit.ly/hifZk'}]}; Facebook.streamPublish('', attachment); } In my flash file, I try using this code to get it to pull the javascript funtion, but no luck. function jspopupWindow(event:MouseEvent):void { var request:URLRequest = new URLRequest("javascript:publishfeed()"); navigateToURL(request,"_blank"); } share_btn.addEventListener(MouseEvent.CLICK, jspopupWindow); Can anyone help me, what am i missing? thanks a

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Trying to configure HWIC-3G-HSPA

- by user1174838

I'm trying to configure a couple of Cisco 1941 routes. The are both identical routers. Each as a HWIC-1T (Smart Serial interface) and a HWIC-3G-HSPA 3G interface. These routers are to be sent to remote sites. We have connectivity to one of the sites but if remote site A gors down we lose connectivity to remote site B. The HWIC-1T is the primary WAN interface using frame relay joining the two remote sites We want the HWIC-3G-HSPA to be usable for direct connectivity from head office to remote site B, and also the HWIC-3G-HSPA is do be used for comms between the remote sites when the frame relay is down (happens quite a bit). I initialy tried to do dynamic routing using EIGRP however in my lab setup of laptop - 1941 - 1941 - laptop, I was unable to get end to end connectivity. I later settled on static routing and have got end to end connectivity but only over frame relay, not the HWIC-3G-HSPA. The sanitized running config for remote site A: version 15.1 service tcp-keepalives-in service tcp-keepalives-out service timestamps debug datetime msec service timestamps log datetime msec service password-encryption service udp-small-servers service tcp-small-servers ! hostname remoteA ! boot-start-marker boot-end-marker ! ! logging buffered 51200 warnings enable secret 5 censored ! no aaa new-model clock timezone wst 8 0 ! no ipv6 cef ip source-route ip cef ! ip domain name yourdomain.com multilink bundle-name authenticated ! chat-script gsm "" "ATDT*98*1#" TIMEOUT 30 "CONNECT" ! username admin privilege 15 secret 5 censored ! controller Cellular 0/1 ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.2.5 255.255.255.0 duplex auto speed auto ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 ip address 10.1.1.2 255.255.255.252 encapsulation frame-relay cdp enable frame-relay interface-dlci 16 frame-relay lmi-type ansi ! interface Cellular0/1/0 ip address negotiated encapsulation ppp dialer in-band dialer idle-timeout 2147483 dialer string gsm dialer-group 1 async mode interactive ppp chap hostname censored ppp chap password 7 censored cdp enable ! interface Cellular0/1/1 no ip address encapsulation ppp ! interface Dialer0 no ip address ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ip route 0.0.0.0 0.0.0.0 Serial0/0/0 210 permanent ip route 0.0.0.0 0.0.0.0 Cellular0/1/0 220 permanent ip route 172.31.2.0 255.255.255.0 Cellular0/1/0 permanent ip route 192.168.3.0 255.255.255.0 10.1.1.1 permanent ip route 192.168.3.0 255.255.255.0 Cellular0/1/0 210 permanent ! access-list 1 permit any dialer-list 1 protocol ip list 1 ! control-plane ! line con 0 logging synchronous login local line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line 0/1/0 exec-timeout 0 0 script dialer gsm login modem InOut no exec transport input all rxspeed 7200000 txspeed 5760000 line 0/1/1 no exec rxspeed 7200000 txspeed 5760000 line vty 0 4 access-class 23 in privilege level 15 password 7 censored login local transport input all line vty 5 15 access-class 23 in privilege level 15 password 7 censored login local transport input all line vty 16 1370 password 7 censored login transport input all ! scheduler allocate 20000 1000 end The sanitized running config for remote site B: version 15.1 service tcp-keepalives-in service tcp-keepalives-out service timestamps debug datetime msec service timestamps log datetime msec service password-encryption service udp-small-servers service tcp-small-servers ! hostname remoteB ! boot-start-marker boot-end-marker ! logging buffered 51200 warnings enable secret 5 censored ! no aaa new-model clock timezone wst 8 0 ! no ipv6 cef ip source-route ip cef ! no ip domain lookup ip domain name yourdomain.com multilink bundle-name authenticated ! chat-script gsm "" "ATDT*98*1#" TIMEOUT 30 "CONNECT" username admin privilege 15 secret 5 censored ! controller Cellular 0/1 ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.3.1 255.255.255.0 duplex auto speed auto ! interface GigabitEthernet0/1 no ip address shutdown duplex auto speed auto ! interface Serial0/0/0 ip address 10.1.1.1 255.255.255.252 encapsulation frame-relay clock rate 2000000 cdp enable frame-relay interface-dlci 16 frame-relay lmi-type ansi frame-relay intf-type dce ! interface Cellular0/1/0 ip address negotiated encapsulation ppp dialer in-band dialer idle-timeout 2147483 dialer string gsm dialer-group 1 async mode interactive ppp chap hostname censored ppp chap password 7 censored ppp ipcp dns request cdp enable ! interface Cellular0/1/1 no ip address encapsulation ppp ! interface Dialer0 no ip address ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ip route 0.0.0.0 0.0.0.0 Serial0/0/0 210 permanent ip route 0.0.0.0 0.0.0.0 Cellular0/1/0 220 permanent ip route 172.31.2.0 255.255.255.0 Cellular0/1/0 permanent ip route 192.168.2.0 255.255.255.0 10.1.1.2 permanent ip route 192.168.2.0 255.255.255.0 Cellular0/1/0 210 permanent ! kron occurrence PING in 1 recurring policy-list ICMP ! access-list 1 permit any dialer-list 1 protocol ip list 1 ! control-plane ! line con 0 logging synchronous login local line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line 0/1/0 exec-timeout 0 0 script dialer gsm login modem InOut no exec transport input all rxspeed 7200000 txspeed 5760000 line 0/1/1 no exec rxspeed 7200000 txspeed 5760000 line vty 0 4 access-class 23 in privilege level 15 password 7 censored login transport input all line vty 5 15 access-class 23 in privilege level 15 password 7 censored login transport input all line vty 16 1370 password 7 censored login transport input all ! scheduler allocate 20000 1000 end The last problem I'm having is the 3G interfaces go down after only a few minutes of inactivity. I've tried using kron to ping the local HWIC-3G-HSPA interface (cellular 0/1/0) every minute but that hasn't been successful. Manually pinging the IP assigned (by the telco) to ce0/1/0 does bring the interface up. Any ideas? Thanks

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Does Displaytag stash the "media type" in a page or request attribute?

- by Pointy

When you enable "export" from Displaytag, the tag code gives you links with special magic parameters that the tag recognizes as indicators that the table contents should be exported (as CSV, Excel, whatever). Well I'm interested in detecting the media type so that (for example) I can exclude columns that make no sense in an export (embedded action buttons, for one thing, or checkboxes for row selection). I suppose I could write a table decorator and use that to stick the media type on the request, but it'd be nice to avoid that if the tag already does it. The documentation is not clear on the subject; I guess I can start digging through the source code too.

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Why does IE prompt a security warning when viewing an XML file?

- by Tav

Opening an XML file in Internet explorer gives a security warning. IE has a nice collapsible tree view for viewing XML, but it's disabled by default and you get this scary error message about a potential security hole. http://www.leonmeijer.nl/archive/2008/04/27/106.aspx But why? How can simply viewing an XML file (not running any embedded macros in it or anything) possibly be a security hole? Sure, I get that running XSLT could potentially do some bad stuff, but we're not talking about executing anything. We're talking about viewing. Why can't IE simply display the XML file as text (plus with the collapsible tree viewer)? So why did they label this as a security hole? Can someone describe how simply viewing an XML document could be used as an attack document?

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[C#] What does MissingManifestResourceException mean and how to fix it?

- by Timwi

The situation: I have a class library, called RT.Servers, containing a few resources (of type byte[], but I don't think that's important) The same class library contains a method which returns one of those resources I have a simple program (with a reference to that library) that only calls that single method I get a MissingManifestResourceException with the following message: Could not find any resources appropriate for the specified culture or the neutral culture. Make sure "Servers.Resources.resources" was correctly embedded or linked into assembly "RT.Servers" at compile time, or that all the satellite assemblies required are loadable and fully signed. I have never played around with cultures, or with assembly signing, so I don't know what's going on here. Also, this works in another project which uses the same library. Any ideas? Edit: I checked the .resx file; all the resources are marked as "Culture=neutral" there. Also, I noticed a similar question and went to check the namespace in Resources.Designer.cs, but it's correct (it's "RT.Servers").

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Dynamics CRM 2013 rich text editor

- by user2962918

I am using Dynamics CRM 2013. How does one apply the rich text editor styling seen on the description field on the email form to other multiple line text fields? Viewing the source code it is obvious that the system is treating the rich text field very differently from the normal multiple line text fields in that instead of rendering a textarea it is rendering a table with an embedded iframe. In CRM 2011, I have used extensions that wrap up the TinyMCE editor but they were never very effective. It seems odd that I can't just check a box to do this to any text field in the settings when the behaviour is obviously built in. Thanks in advance. Richard.

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