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• How do you interface with a USB to Parallel adapter?

  - by Hans

  I'm currently doing a project where I have to interact with a circuit I made through the parallel port of a computer. However, my computer doesn't have a parallel port so I borrowed a Parallel to USB adapter cable. The cable didn't come with any drivers, but it's recognized by the device manager as a "USB Printing Support" controller, under the USB section. It seems that old parallel printers can be plugged in and work properly without any problems. So my question is, if I write a program in Java that tries to interact with a parallel port directly, will it work? And if not, can anyone give me some pointers as to what I need to do to interact with it? Thanks.

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• Extract paragraphs from Wikipedia API using PHP cURL

  - by Kane

  Here's what I'm trying to do using the Wikipedia (MediaWiki) API - http://en.wikipedia.org/w/api.php Do a GET on http://en.wikipedia.org/w/api.php?format=xml&action=opensearch&search=[keyword] to retrieve a list of suggested pages for the keyword Loop through each suggested page using a GET on http://en.wikipedia.org/w/api.php?format=json&action=query&export&titles=[page title] Extract any paragraphs found on the page into an array Do something with the array I'm stuck on #3. I can see a bunch of JSON data that includes "\n\n" between paragraphs, but for some reason the PHP explode() function doesn't work. Essentially I just want to grab the "meat" of each Wikipedia page (not titles or any formatting, just the content) and break it by paragraph into an array. Any ideas? Thanks!

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• PLS-00103: Encountered the symbol "end-of-file" in simple update block

  - by rageingnonsense

  Hello, The following Oracle statement: DECLARE ID NUMBER; BEGIN UPDATE myusername.terrainMap SET playerID = :playerID,tileLayout = :tileLayout WHERE ID = :ID END; Gives me the following error: ORA-06550: line 6, column 15: PL/SQL: ORA-00933: SQL command not properly ended ORA-06550: line 3, column 19: PL/SQL: SQL Statement ignored ORA-06550: line 6, column 18: PLS-00103: Encountered the symbol "end-of-file" when expecting one of the following: ( begin case declare end exception exit for goto if loop mod null pragma raise return select update while with <an identifier> <a double-quoted> I am pretty much at a loss. This appears to be a rather simple statement. If it helps any, I had a similar statement that performed an INSERT which used to work, but today has been giving me the same message.

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• How do I check if a user is authenticated with NickServ using POE::Component::IRC::State in Perl?

  - by Troy

  I'm trying to test whether a user is registered on FreeNode. nick_info() doesn't seem to return information about this, so I want to use $irc-yield(whois = $nick); and then grab the irc_whois event's reply. The problem is that I want to wait until this event is fired, so I created a global variable $whois_result and wrote a sub like this: sub whois { my $nick = $_[0]; $whois_result = 0; $irc->yield(whois => $nick); while($whois_result == 0) { } return $whois_result; } with the irc_whois handler looking like: sub on_whois { $whois_result = $_[ARG0]; print "DEBUG: irc_whois fired.\n"; } Unfortunately, the event can't fire while the loop is running so this hangs. I'm sure there's a better way to do this, but I'm not familiar enough with this kind of programming to know. Any help would be greatly appreciated.

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• Reducing piracy of iPhone applications

  - by Alex Reynolds

  What are accepted methods to reduce iPhone application piracy, which do not violate Apple's evaluation process? If my application "phones home" to provide the unique device ID on which it runs, what other information would I need to collect (e.g., the Apple ID used to purchase the application) to create a valid registration token that authorizes use of the application? Likewise, what code would I use to access that extra data? What seem to be the best available technical approaches to this problem, at the present time? (Please refrain from non-programming answers about how piracy is inevitable, etc.)

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• Android getWifiState to String

  - by ahsteele

  I am attempting to get the string representation of an Android device's current WiFi state. I am using the getWifiState() method of the WiFiManager and am getting an integer returned depending on the current state. This makes total sense as getWifiState() is supposed to return an integer. The method's documentation indicates that the possible return values translate to one of the following constant values 0 WIFI_STATE_DISABLING 1 WIFI_STATE_DISABLED 2 WIFI_STATE_ENABLING 3 WIFI_STATE_ENABLED 4 WIFI_STATE_UNKNOWN Is there an easy way to translate the integer returned from getWiFiState() to a string representation? I've looked at getIntExtra but am unsure of its use.

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• Help replace this SQL cursor with better code

  - by user318573

  Can anyone give me a hand improving the performance of this cursor logic from SQL 2000. It runs great in SQl2005 and SQL2008, but takes at least 20 minutes to run in SQL 2000. BTW, I would never choose to use a cursor, and I didn't write this code, just trying to get it to run faster. Upgrading this client to 2005/2008 is not an option in the immediate future. ------------------------------------------------------------------------------- ------- Rollup totals in the chart of accounts hierarchy ------------------------------------------------------------------------------- DECLARE @B_SubTotalAccountID int, @B_Debits money, @B_Credits money, @B_YTDDebits money, @B_YTDCredits money DECLARE Bal CURSOR FAST_FORWARD FOR SELECT SubTotalAccountID, Debits, Credits, YTDDebits, YTDCredits FROM xxx WHERE AccountType = 0 AND SubTotalAccountID Is Not Null and (abs(credits)+abs(debits)+abs(ytdcredits)+abs(ytddebits)<>0) OPEN Bal FETCH NEXT FROM Bal INTO @B_SubTotalAccountID, @B_Debits, @B_Credits, @B_YTDDebits, @B_YTDCredits --For Each Active Account WHILE @@FETCH_STATUS = 0 BEGIN --Loop Until end of subtotal chain is reached WHILE @B_SubTotalAccountID Is Not Null BEGIN UPDATE xxx2 SET Debits = Debits + @B_Debits, Credits = Credits + @B_Credits, YTDDebits = YTDDebits + @B_YTDDebits, YTDCredits = YTDCredits + @B_YTDCredits WHERE GLAccountID = @B_SubTotalAccountID SET @B_SubTotalAccountID = (SELECT SubTotalAccountID FROM xxx2 WHERE GLAccountID = @B_SubTotalAccountID) END FETCH NEXT FROM Bal INTO @B_SubTotalAccountID, @B_Debits, @B_Credits, @B_YTDDebits, @B_YTDCredits END CLOSE Bal DEALLOCATE Bal

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• iPad split controller that doesn't hide the left pane in portrait

  - by Tim Norman

  I am trying to implement a split view controller like UISplitViewController on the iPad, but I don't want the left pane to be hidden when the device is in portrait orientation. So I've created a UIViewController subclass for this in IB and it works fine without any sub-view controllers. Now I'm trying to wrap my head around what is required to setup and manage the two UIViewController objects for the left and right panes. In my app, they are going to both be UINavigationController with a UITableView in them. I've hit a mental road block about how to set this up and was hoping someone could point me to some sample code or give me a recommendation for architecture here...

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• How to check a local wifi connection

  - by Thomas Joos

  hi all, I'm writing an app which connects to a static ip adress in a local network. How can I check if I have a local network connection? I want to connect to http://192.168.2.5 and i tried using the Rechability class but it returns FALSE, while the device is definately connected ( when i don't do the check, the app works fine so there is a connection ): Reachability *r = [Reachability reachabilityWithHostName:@"http://192.168.2.5"]; NetworkStatus internetStatus = [r currentReachabilityStatus]; How should work this out? Thomas

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• Custom component which displays voice recognition button if available

  - by steff

  Hi evereyone, I'd like to create a custom component which supports voice recognition. It will primarily be an extended EditText which should show the microphone button for voice recognition if it is available. I wanted to to look at the search app-widget on the homescreen but I don't find it in the source. This is intended to use the voice recognition as some sort of dictation device, i.e. the user does not have to type but use his voice instead. So could anyone please point me in some direction? Thanks in advance, Steff

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• Make compiler copy characters using movsd

  - by Suma

  I would like to copy a relatively short sequence of memory (less than 1 KB, typically 2-200 bytes) in a time critical function. The best code for this on CPU side seems to be rep movsd. However I somehow cannot make my compiler to generate this code. I hoped (and I vaguely remember seeing so) using memcpy would do this using compiler built-in instrinsic, but based on disassembly and debugging it seems compiler is using call to memcpy/memmove library implementation instead. I also hoped the compiler might be smart enough to recognize following loop and use rep movsd on its own, but it seems it does not. char *dst; const char *src; // ... for (int r=size; --r>=0; ) *dst++ = *src++; Is there some way to make the Visual Studio compiler to generate rep movsd sequence other than using inline assembly?

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• Java: startingPath as "public static final" exception

  - by HH

  [Updated] Thanks to polygenelubricants's reply, the real problem is the exception from the method getCanonicalPath() because I cannot include try-catch-loop there. $ cat StartingPath.java import java.util.*; import java.io.*; public class StartingPath { public static final String startingPath = (new File(".")).getCanonicalPath(); public static void main(String[] args){ System.out.println(startingPath); } } $ javac StartingPath.java StartingPath.java:5: unreported exception java.io.IOException; must be caught or declared to be thrown public static final String startingPath = (new File(".")).getCanonicalPath(); ^ 1 error

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• Does a Collection<T> wrap an IList<T> or enumerate over the IList<T>?

  - by Brian Triplett

  If I am exposing a internal member via a Collection property via: public Collection<T> Entries { get { return new Collection<T>(this.fieldImplimentingIList<T>); } } When this property is called what happens? For example what happens when the following lines of code are called: T test = instanceOfAbove.Entries[i]; instanceOfAbove[i] = valueOfTypeT; It's clear that each time this property is called a new reference type is created but what acctually happens? Does it simply wrap the IList<T> underneath, does it enumerate over the IList<T> and to create a new Collection<T> instance? I'm concerned about performance if this property is used in a for loop.

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• .NET - downloading multiple pages from a website with a single DNS query

  - by lampak

  I'm using HttpRequest to download several pages from a website (in a loop). Simplifying it looks like this: HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create( "http://sub.domain.com/something/" + someString ); HttpWebResponse resp = (HttpWebResponse)req.GetResponse(); //do something I'm not quite sure actually but every request seems to resolve the address again (I don't know how to test if I'm right). I would like to boost it a little and resolve the address once and then reuse it for all requests. I can't work out how to force HttpRequest into using it, though. I have tried using Dns.GetHostAddresses, converting the result to a string and passing it as the address to HttpWebRequest.Create. Unfortunately, server returns error 404 then. I managed to google that's probably because the "Host" header of the http query doesn't match what the server expects. Is there a simple way to solve this?

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• How to get the playing file total time duration Media player

  - by Geetha

  Hi All, I use media player control to play mp3 files in asp.net application. I want to find When the playing process gets end and the total time require to finish the file using javascript. Code: <object id="mediaPlayer" classid="clsid:22D6F312-B0F6-11D0-94AB-0080C74C7E95" codebase="http://activex.microsoft.com/activex/controls/mplayer/en/nsmp2inf.cab#Version=5,1,52,701" height="1" standby="Loading Microsoft Windows Media Player components..." type="application/x-oleobject" width="1"> <param name="fileName" value="" /> <param name="animationatStart" value="true" /> <param name="transparentatStart" value="true" /> <param name="autoStart" value="true" /> <param name="showControls" value="true" /> <param name="volume" value="100" /> <param name="loop" value="true" /> </object> Geetha.

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• How do I ignore set and get when assigning or retrieving a value?

  - by cbsch

  Hello. Is it possible to ignore set and get when I'm assigning to or retrieving a value? In specific, I'm inheriting from a class that has a property declared like this: public Int32 Value { get; set; } What I'd like to do is to override it and do something useful in those set and get's. The problem appears when I override it, I also have to manually assign, or return the value from the property. If I do something like this: override public Int32 Value { get { return this.Value; } set { this.Value = value; // do something useful } Then I'm creating an infinite loop. Is there a way to set or get the value without invoking the code in set and get, or do I have to make a separate name for the actual variable?

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• An important question on iPhone file writing

  - by Kyle

  I use the NSHomeDirectory() function to get the app's home folder, and write to the Documents directory within that. I'm curious, though, what happens when the user downloads an update for the app in the appstore? Will it all be deleted? When I delete the app on the device, then reinstall it, its wiped out. So, I'm curious to know what will happen with an update. I can't find this in the documentation at all. Thanks alot for reading. I really tried to find this asked somewhere else first, but couldn't. Hopefully this page will be informative to guys like me who are confused on the subject.

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• Modelling boost::Lockable with semaphore rather than mutex (previously titled: Unlocking a mutex fr

  - by dan

  I'm using the C++ boost::thread library, which in my case means I'm using pthreads. Officially, a mutex must be unlocked from the same thread which locks it, and I want the effect of being able to lock in one thread and then unlock in another. There are many ways to accomplish this. One possibility would be to write a new mutex class which allows this behavior. For example: class inter_thread_mutex{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique_lock<boost::mutex> lck(mx); while(locked) cv.wait(lck); locked=true; } void unlock(){ { boost::lock_guard<boost::mutex> lck(mx); if(!locked) error(); locked=false; } cv.notify_one(); } // bool try_lock(); void error(); etc. } I should point out that the above code doesn't guarantee FIFO access, since if one thread calls lock() while another calls unlock(), this first thread may acquire the lock ahead of other threads which are waiting. (Come to think of it, the boost::thread documentation doesn't appear to make any explicit scheduling guarantees for either mutexes or condition variables). But let's just ignore that (and any other bugs) for now. My question is, if I decide to go this route, would I be able to use such a mutex as a model for the boost Lockable concept. For example, would anything go wrong if I use a boost::unique_lock< inter_thread_mutex for RAII-style access, and then pass this lock to boost::condition_variable_any.wait(), etc. On one hand I don't see why not. On the other hand, "I don't see why not" is usually a very bad way of determining whether something will work. The reason I ask is that if it turns out that I have to write wrapper classes for RAII locks and condition variables and whatever else, then I'd rather just find some other way to achieve the same effect. EDIT: The kind of behavior I want is basically as follows. I have an object, and it needs to be locked whenever it is modified. I want to lock the object from one thread, and do some work on it. Then I want to keep the object locked while I tell another worker thread to complete the work. So the first thread can go on and do something else while the worker thread finishes up. When the worker thread gets done, it unlocks the mutex. And I want the transition to be seemless so nobody else can get the mutex lock in between when thread 1 starts the work and thread 2 completes it. Something like inter_thread_mutex seems like it would work, and it would also allow the program to interact with it as if it were an ordinary mutex. So it seems like a clean solution. If there's a better solution, I'd be happy to hear that also. EDIT AGAIN: The reason I need locks to begin with is that there are multiple master threads, and the locks are there to prevent them from accessing shared objects concurrently in invalid ways. So the code already uses loop-level lock-free sequencing of operations at the master thread level. Also, in the original implementation, there were no worker threads, and the mutexes were ordinary kosher mutexes. The inter_thread_thingy came up as an optimization, primarily to improve response time. In many cases, it was sufficient to guarantee that the "first part" of operation A, occurs before the "first part" of operation B. As a dumb example, say I punch object 1 and give it a black eye. Then I tell object 1 to change it's internal structure to reflect all the tissue damage. I don't want to wait around for the tissue damage before I move on to punch object 2. However, I do want the tissue damage to occur as part of the same operation; for example, in the interim, I don't want any other thread to reconfigure the object in such a way that would make tissue damage an invalid operation. (yes, this example is imperfect in many ways, and no I'm not working on a game) So we made the change to a model where ownership of an object can be passed to a worker thread to complete an operation, and it actually works quite nicely; each master thread is able to get a lot more operations done because it doesn't need to wait for them all to complete. And, since the event sequencing at the master thread level is still loop-based, it is easy to write high-level master-thread operations, as they can be based on the assumption that an operation is complete when the corresponding function call returns. Finally, I thought it would be nice to use inter_thread mutex/semaphore thingies using RAII with boost locks to encapsulate the necessary synchronization that is required to make the whole thing work.

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• Blackberry ESS standalone mode && Outlook 2007

  - by new Blackberry developer

  Hi, I launch Blackberry ESS in standalone mode. However I don't have Outlook Express on my computer. Instead I have Outlook 2007 on my computer. I set up an email account in Outlook 2007 which uses 'localhost' as its pop3/smtp server. The port numbers I used are the same as those in http://www.blackberryforums.com/developer-forum/5590-sending-receiving-email-device-simulator.html. However I got the following exception. 'UnknownHostException:pop3.server'. I am wondering if Outlook 2007 works with ESS.

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• w3wp.exe in ASP.NET production app is using 100% CPU. How to find the problem ?

  - by Tucker

  Hi, we have an asp.net app in production where w3wp.exe is taking 100% CPU ( 4 cores - 4 threads at 25% ) and cpu load never goes down until we recycle the application pool ( the app is alone in the application pool ). Our error log has nothing, there is no exceptions being emitted ( or at least we don't catch them ) so we suspect it's code problem ( infinite loop / deadlock ). The problem only arises after some hours running with high load ( several thousand users ). There is any way to profile one of the EXISTING threads that is causing cpu load ? After taking a look to JetBrains's DotTrace Profiler seems like it's not possible for limitations of Profiling API and man, we haven't get to reproduce the problem in our testing environment. The app uses SQL Server 2005, LINQ2SQL and System.Transactions API. Any suggestion to find the problem ?

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• android activity class does not exists?

  - by user975234

  I have been developing a project in eclipse for an android app. An error which i frequently get is that of- activity class does not exist. But when i just save the manifest file once again the error vanishes and the program runs correctly. Why then do i get the same error again and again. ? Console error: [2011-11-18 15:08:38 - link] Starting activity acb.abc.LinkActivity on device emulator-5554 [2011-11-18 15:08:40 - link] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=acb.abc/.LinkActivity } [2011-11-18 15:08:40 - link] New package not yet registered with the system. Waiting 3 seconds before next attempt. [2011-11-18 15:08:40 - link] ActivityManager: Error: Activity class {acb.abc/acb.abc.LinkActivity} does not exist.

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• XML creation using DOM and MYSQL

  - by dbomb101

  I am trying to create a XML document from information extracted from a mysql table. I am using a tutorial to accomplish this http://www.tonymarston.net/php-mysql/dom.html#a5 what I want to do is to create each element separately, instead of creating them all at once as shown in the tutorial. In order to do that I am trying to place the specific field name into the foreach loop below, any help would be greatly appreciated. foreach ($row as where fieldname should go => $row['artistname']) { $artval = $doc->createTextNode($row['artistname']); $artval = $chil->appendChild($val); }

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• On WindowsMobile, how can i tell what other processes are reserving shared memory space?

  - by glutz78

  On WindowMobile 6.1, I am using VirtualAlloc to reserve 2MB chunks, which will return me an address from the large shared memory area so allocations do not count against my per process virtual space. (doc here: http://msdn.microsoft.com/en-us/library/aa908768.aspx) However, on some devices i notice that I am not able to reserve memory after a certain point. VirtualAlloc will return NULL (getlasterror() says out of memory). The only explanation for this that I see is that another process has already reserved a bunch of memory and my process is therefore unable to. Any idea where I can find a tool to show me the shared mem region of a WM device? Thanks.

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• iPhone - Bug using CADisplayLink and UIControls - bad to mix openGL and UIControls?

  - by Adam

  Having had problems using other methods, I've decided to stick with CADisplayLink to run my game loop. The animation is smooth now, but sometimes there's a problem where the buttons and other UI elements can't be used, can't be accessed by touch or changed programmatically. This includes UIButtons and UILabels. Has anyone encountered this before? Is it not a good idea in general to use interface builder and uicontrols on top of an OpenGL view? I've heard they don't play well together but haven't heard the reasons. Thanks!

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• Character Movement Animation

  - by Kartik Kolluri

  Hi Guys! I've read a lot around everywhere, but wasn't able to make a simple character movement animation. What I have is a PNG file and an associated PLIST file with all the frames for a "walking" animation of a character that I want to run when the user touches the screen. I want to loop that animation and also at the same time, move the character to the right or left. I want to use Cocos2D in doing this. Does anyone have any code pieces or suggestions on how to do that? Thanks in advance!

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