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• Does it make sense to have more than one UDP Datagram socket on standby? Are "simultaneous" packets

  - by Gubatron

  I'm coding a networking application on Android. I'm thinking of having a single UDP port and Datagram socket that receives all the datagrams that are sent to it and then have different processing queues for these messages. I'm doubting if I should have a second or third UDP socket on standby. Some messages will be very short (100bytes or so), but others will have to transfer files. My concern is, will the Android kernel drop the small messages if it's too busy handling the bigger ones? Update "The latter function calls sock_queue_rcv_skb() (in sock.h), which queues the UDP packet on the socket's receive buffer. If no more space is left on the buffer, the packet is discarded. Filtering also is performed by this function, which calls sk_filter() just like TCP did. Finally, data_ready() is called, and UDP packet reception is completed."

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• Integrate forum software into existing Zend site

  - by mrbubblesort

  I've searched around and haven't really found anything on this, so maybe someone here has tried this before. My company already has a website built with Zend, and we'd like to add in a forum as well. All I really need is something that will work with postgresql and has foreign language support (particularly Japanese, but if worst comes to worst, I'll just translate it myself). phpBB fits all my needs though. Is it possible to get the two working together? Or is there another forum software that'll work with Zend? Or is it better to just build the thing from scratch? Thanks!

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• Flex/Flash 4 datagrid literally displays XML

  - by Setori

  Problem: Flex/Flash4 client (built with FlashBuilder4) displays the xml sent from the server exactly as is - the datagrid keeps the format of the xml. I need the datagrid to parse the input and place the data in the correct rows and columns of the datagrid. flow: click on a date in the tree and it makes a server request for batch information in xml form. Using a CallResponder I then update the datagrid's dataProvider. [code] <fx:Script> <![CDATA[ import mx.controls.Alert; [Bindable]public var selectedTreeNode:XML; public function taskTreeChanged(event:Event):void { selectedTreeNode=Tree(event.target).selectedItem as XML; var searchHubId:String = selectedTreeNode.@hub; var searchDate:String = selectedTreeNode.@lbl; if((searchHubId == "") || (searchDate == "")){ return; } findShipmentBatches(searchDate,searchHubId); } protected function findShipmentBatches(searchDate:String, searchHubId:String):void{ findShipmentBatchesResult.token = actWs.findShipmentBatches(searchDate, searchHubId); } protected function updateBatchDataGridDP():void{ task_list_dg.dataProvider = findShipmentBatchesResult.lastResult; } ]]> </fx:Script> <fx:Declarations> <actws:ActWs id="actWs" fault="Alert.show(event.fault.faultString + '\n' + event.fault.faultDetail)" showBusyCursor="true"/> <s:CallResponder id="findShipmentBatchesResult" result="updateBatchDataGridDP()"/> </fx:Declarations> <mx:AdvancedDataGrid id="task_list_dg" width="100%" height="95%" paddingLeft="0" paddingTop="0" paddingBottom="0"> <mx:columns> <mx:AdvancedDataGridColumn headerText="Receiving date" dataField="rd"/> <mx:AdvancedDataGridColumn headerText="Msg type" dataField="mt"/> <mx:AdvancedDataGridColumn headerText="SSD" dataField="ssd"/> <mx:AdvancedDataGridColumn headerText="Shipping site" dataField="sss"/> <mx:AdvancedDataGridColumn headerText="File name" dataField="fn"/> <mx:AdvancedDataGridColumn headerText="Batch number" dataField="bn"/> </mx:columns> </mx:AdvancedDataGrid> [/code] I cannot upload a pic, but this is the xml: [code] 2010-04-23 16:35:51.0 PRESHIP 2010-02-15 00:00:00.0 100000009 DF-Ocean-PRESHIPSUM-Quanta-PACT-EMEA-Scheduled Ship Date 20100215.csv 10053 [/code] and the xml is pretty much displayed exactly as is in the datagrid columns... I would appreciate your assistance.

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• QWidget keyPressEvent override

  - by eaigner

  Hi there, I'm trying for half an eternity now overriding QWidgets keyPressEvent function in QT but it just won't work. I've to say i am new to CPP, but I know ObjC and standard C. My problem looks like this: class QSGameBoard : public QWidget { Q_OBJECT public: QSGameBoard(QWidget *p, int w, int h, QGraphicsScene *s); signals: void keyCaught(QKeyEvent *e); protected: virtual void keyPressEvent(QKeyEvent *event); }; QSGameBoard is my QWidget subclass and i need to override the keyPressEvent and fire a SIGNAL on each event to notify some registered objects. My overridden keyPressEvent in QSGameBoard.cpp looks like this: void QSGameBoard::keyPressEvent(QKeyEvent *event) { printf("\nkey event in board: %i", event->key()); //emit keyCaught(event); } When i change QSGameBoard:: to QWidget:: it receives the events, but i cant emit the signal because the compiler complains about the scope. And if i write it like this the function doesn't get called at all. What's the problem here?

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• JavaScript: 'foo.value' not working in IE?

  - by pete

  Hi! A few hours ago, I was instructed how to style a specific textarea with JS. The following piece of code (thanks again, Mario Menger) works like a charm in Firefox but unfortunately nothing happens in Internet Explorer (7 tested only so far). var foo = document.getElementById('HCB_textarea'); var defaultText = 'Your message here'; foo.value = defaultText; foo.style.color = '#888'; foo.onfocus = function(){ foo.style.color = '#000'; if ( foo.value == defaultText ) { foo.value = ''; } }; foo.onblur = function(){ foo.style.color = '#888'; if ( foo.value == '' ) { foo.value = defaultText; } }; I've already tried to replace 'value' by 'innerHTML' (for IE only) but to no effect. Any suggestions? TIA

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• Using C Structs which contains ObjC Objects?

  - by GuidoMB

  I'm using C structs in objc and I've created a function that assembles the structure like the one from the Cocoa API. The things is that this structure is not like NSRect o NSPoint this structure packs objc objects soo I'm seeing a potential memory leak here. Do I need to provide a function to 'release' the structure? I'am not creating a ISKNewsCategory class because there will be no behavior but Do you think this is a good approach or I should define the class even doe there will be no behavior? typedef struct ISK_NewsCategory { NSString *name; NSString *code } ISKNewsCategory; NS_INLINE ISKNewsCategory ISKMakeNewsCategory(NSString *name, NSString *code) { ISKNewsCategory category; category.name = [name retain]; category.code = [code retain]; return category; }

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• Interpolation of time series data in R

  - by Pierreten

  I'm not sure what i'm missing here, but i'm basically trying to compute interpolated values for a time series; when I directly plot the series, constraining the interpolation points with "interpolation.date.vector", the plot is correct: plot(date.vector,fact.vector,ylab='Quantity') lines(spline(date.vector,fact.vector,xout=interpolation.date.vector)) When I compute the interpolation, store it in an intermediate variable, and then plot the results; I get a radically incorrect result: intepolated.values <- spline(date.vector,fact.vector,xout=interpolation.date.vector) plot(intepolated.values$x,intepolated.values$y) lines(testinterp$x,testinterp$y) Doesn't the lines() function have to execute the spline() function to retrieve the interpolated points in the same way i'm doing it?

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• How to list directory hierarchy in PyGTK treeview widget?

  - by lyrae

  I am trying to generate a hierarchical directory listing in pyGTK. Currently, I have this following directory tree: /root folderA - subdirA - subA.py - a.py folderB - b.py I have written a function that -almost- seem to work: def go(root, piter = None): for filename in os.listdir(root): isdir = os.path.isdir(os.path.join(root, filename)) piter = self.treestore.append(piter, [filename]) if isdir == True: go(os.path.join(root, filename), piter) This is what i get when i run the app: I also think my function is inefficient and that i should be using os.walk(), since it already exists for such purpose. How can I, and what is the proper/most efficient way of generating a directory tree with pyGTK?

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• Not Recieving JSON object into my Zend Controller

  - by davykiash

  Am am sucessfully parsing and sending json values from my client for my server side controller to recieve and parse $("#test2").click(function() { $.ajax({ type: "POST", url: "<?php echo $this->baseUrl() ?>/expensetypes/add", data: JSON.stringify(wrapFormValues($('#expensetypes'))), contentType: "application/json; charset=utf-8", dataType: "json", success: function(msg){ alert( "Data Saved: " + msg ); } }); }); However in my controller the code $this->getRequest()->getPost() doesnt seem to recieve the json object that my client is sending though firebug clearly shows that my json object is being parsed and sent. What am I missing?

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• Parse error: syntax error, unexpected T_PUBLIC in ..... ?

  - by tonsils

  Hi, I am new to php and trying out this tutorial at : http://css-tricks.com/php-for-beginners-building-your-first-simple-cms/ Unfortunately I am getting the following error and can't seem to track down the reason: Parse error: syntax error, unexpected T_PUBLIC in ../simpleCMS.php on line 56 My code for simpleCMS.php is as is in the tutorial link above. FYI, my line 56 is the following line of code in simpleCMS.php public function display_admin() { Above this line is public function display_public() Can anyone possibly see what I could be doing wrong and again, my code is the same code from the tutorial website and have downloaded the files that came with it? Hoping someone can point me in the right direction. Furthermore, I am using Mac OS X MAMP to run my Apache/MySQL Server locally. My other question is, when I using the following command: mysql_connect($this->host,$this->username,$this->password) is my hostname 'localhost' alone or do I also have to include port alongside the localhost? Thanks again.

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• Problem getting correct parameters for C# P/Invoke call to C++ dll

  - by Jim Jones

  Trying to Interop a functionality from the Outside In API from Oracle. Have the following function: SCCERR EXOpenExport {VTHDOC hDoc, VTDWORD dwOutputId, VTDWORD dwSpecType, VTLPVOID pSpec, VTDWORD dwFlags, VTSYSPARAM dwReserved, VTLPVOID pCallbackFunc, VTSYSPARAM dwCallbackData, VTLPHEXPORT phExport); From the header files I reduced the parameters to: typedef VTSYSPARAM VTHDOC, VTLPHDOC * typedef DWORD_PTR VTSYSPARAM typedef unsigned long DWORD_PTR typedef unsigned long VTDWORD typedef VTVOID* VTLPVOID #define VTVOID void typedef VTHDOC VTHEXPORT, *VTLPEXPORT These are for 32 bit windows Going through the header files, the example programs, and the documentation I found: 1. That pSpec could be a pointer to a buffer or NULL, so I set it to a IntPtr.Zero (documentation). 2. That dwFlags and dwReserved according to the documentation "Must be set by the developer to 0". 3. That pCallbackFunc can be set to NULL if I don't want to handle callbacks. 4. That the last two are based on structs that I wrote C# wrappers for using the [StructLayout(LayoutKind.Sequential)]. Then instatiated an instance and generated the parameters by first creating a IntPtr with Marshal.AllocHGlobal(Marshal.SizeOf(instance)), then getting the address value which is passed as a uint for dwCallbackData and a IntPtr for phExport. The final parameter list is as follows: 1. phDoc as a IntPtr which was loaded with an address by the DAOpenDocument function called before. 2. dwOutputId as uint set to 1535 which represents FI_JPEGFIF 3. dwSpecType as int set to 2 which represents IOTYPE_ANSIPATH 4. pSpec as an IntPtr.Zero where the output will be written 5. dwFlags as uint set to 0 as directed 6. dwReserved as uint set to 0 as directed 7. pCallbackFunc as IntPtr set to NULL as I will handle results 8. dwCallBackDate as uint the address of a buffer for a struct 9. phExport as IntPtr to another struct buffer still get an undefined error from the API. Meaning that the call returns a 961 which is not defined in any of the header files. In the past I have gotten this when my choice of parameter types are incorrect. I started out using Interop Assistant which was helpful in learning how many of the parameter types get translated. It is however limited by how well I am able to glean the correct native type from the header files. For example the hDoc parameter used in the preceding function was defined as a non-filesytem handle, so attempted to use Marshal to create a handle, then used an IntPtr, and finally it turned out to be an int (actually it was &phDoc used here). So is there a more scientific way of doing this, other than trial and error? Jim

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• Not all parameters get sent in jquery ajax call

  - by rksprst

  I have a strange error where my jquery ajax request doesn't submit all the parameters. $.ajax({ url: "/ajax/doAssignTask", type: 'GET', contentType: "application/json", data: { "just_a_task": just_a_task, "fb_post_date": fb_post_date, "task_fb_postId": task_fb_postId, "sedia_task_guid": sedia_task_guid, "itemGuid": itemGuid, "itemType": itemType, "taskName": taskName, "assignedToUserGuid": assignedToUserGuid, "taskDescription": taskDescription }, success: function(data, status) { //success code }, error: function(xhr, desc, err) { //error code } }); But using firebug (and debugging) I can see that only these variables are posted: assignedToUserGuid itemGuid itemType just_a_task taskDescription taskName It's missing fb_post_date, task_fb_postId, and sedia_task_guid I have no idea what would cause it to post only some items and not others? Anyone know? Data is sent to asp.net controller that returns jsonresult (hence the contentType) Any help is appreciated. Thanks!

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• jQuery append Google Adsense to div..

  - by SoulieBaby

  Hi everyone, I'm having issues with google adsense and it loading before my jQuery and killing my codes, so I thought I'd try to append the Google Adsense javascript to the appropriate div using the document ready function, here's the code I'm trying to write: <script language="javascript" type="text/javascript"> $(document).ready(function(){ $(".googleBanners").html("<script language='javascript' type='text/javascript'>\n" + "google_ad_client = 'pub-8487967187298044';\n" + "google_ad_slot = '1088799521';\n" + "google_ad_width = 250;\n" + "google_ad_height = 250;\n" + "</" + "script>\n" + "<script language='javascript' src='http://pagead2.googlesyndication.com/pagead/show_ads.js' type='text/javascript'>" + "</" + "script>"); }); </script> But I'm not so good writing javascript/jQuery so if someone could help me implement this that would be fantastic. The error in FF I'm currently getting is "Error: google_protectAndRun is not defined". I'm not sure what that means, but I'm guessing I've written the jQuery code wrong.. lol

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• Wordpress "Home" link

  - by Johann

  Hi all, I'm working on a Sandbox based Wordpress theme and I would like to add a home link as a first item in the navigation. I know I should change the function in "sandbox_globalnav" in the functions.php file, which is: // Produces a list of pages in the header without whitespace function sandbox_globalnav() { if ( $menu = str_replace( array( "\r", "\n", "\t" ), '', wp_list_pages('title_li=&sort_column=menu_order&echo=0') ) ) $menu = '<ul>' . $menu . '</ul>'; $menu = '<div id="menu">' . $menu . "</div>\n"; echo apply_filters( 'globalnav_menu', $menu ); // Filter to override default globalnav: globalnav_menu } However, my PHP skills are really basic and I'm not sure where I should override this. Thanks!

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• RSA encryption results in server execution timeout

  - by Nilambari

  Hi, I am using PHP Crypt_RSA (http://pear.php.net/package/Crypt_RSA) for encrypting and decrypting the contents. Contents are of 1kb size. Following are the results: keylength = 1024 Encryption function takes time: 225 secs keylength = 2048 Encryption function takes time: 115 secs I need to reduce this execution time as most of the live apache servers have 120 sec limit for execution time. How to reduce this execution time? RSA alorithm docs says the only 1024 - 2048 keys are generated. I ACTUALLY tried to generate larger key, but it always results in execution timeout. How do i work on reducing encryption - decryption execution time? Thanks, Nila

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• Kernel panic when altering system_call in entry.S

  - by EpsilonVector

  I'm trying to implement a system call counter, and as a result I included an int value in task_struct, and a function that increments it in a separate file. This function is supposed to be called from system_call right before it actually calls the required sys_call (I have my reasons to call it before and not after). However, if I place it before the sys_call then after compiling and booting there's a kernel panic ("tried to kill init_idle"), and if I place it right after the sys_call, it works. What's the difference and how do I overcome this? Here's the relevant code ENTRY(system_call) pushl %eax # save orig_eax SAVE_ALL GET_CURRENT(%ebx) testb $0x02,tsk_ptrace(%ebx) # PT_TRACESYS jne tracesys cmpl $(NR_syscalls),%eax jae badsys call update_counter /*This causes a kernel panic*/ call *SYMBOL_NAME(sys_call_table)(,%eax,4) movl %eax,EAX(%esp) # save the return value

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• Getting a specific number of JSON items with jQuery from tumblr feed

  - by Kevin Whitaker

  Hello all. I'm trying to populate a page with X entries from my tumblr feed, and I'm wondering how I can only pull that X number from the JSON object it returns. Here's my code, pulled from another Stack Overflow post and modified: //Tumblr retrieval $.getJSON("http://tumblr-address/api/read/json?callback=?", function(data) { $.each(data.posts, function(i,posts){ var title = this["regular-title"]; var type = this.type; var date = this.date; var url = this["url-with-slug"]; $('#sideRail ol').prepend('<li><p><a href=' +url +'>' + title + '</a></p><p>' + date + '</p></li>'); }); }); I've tried using a while loop with a counter, but it just repeats everything X times before moving on to the next item in the list. Thanks for any help.

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• Reading ASCII numbers using "D" instead of "E" for scientific notation using C

  - by Arrieta

  Hello, I have a list of numbers which looks like this: 1.234D+1 or 1.234D-02. I want to read the file using C. The function atof will merely ignore the D and translate only the mantissa. The function fscanf will not accept the format '%10.6e' because it expects an E instead of a D in the exponent. When I ran into this problem in Python, I have up and merely used a string substitution before converting from string to float. But in C, I am sure there must be another way. So, how would you read a file with numbers using D instead of E for scientific notation? Notice that I do not mean how to read the strings themselves, but rather how to convert them to floats. Thanks.

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• Problems with contenttypes when loading a fixture in Django

  - by gerdemb

  I am having trouble loading Django fixtures into my MySQL database because of contenttypes conflicts. First I tried dumping the data from only my app like this: ./manage.py dumpdata escola > fixture.json but I kept getting missing foreign key problems, because my app "escola" uses tables from other applications. I kept adding additional apps until I got to this: ./manage.py dumpdata contenttypes auth escola > fixture.json Now the problem is the following constraint violation when I try to load the data as a test fixture: IntegrityError: (1062, "Duplicate entry 'escola-t23aluno' for key 2") It seems the problem is that Django is trying to dynamically recreate contenttypes with different primary key values that conflict with the primary key values from the fixture. This appears to be the same as bug documented here: http://code.djangoproject.com/ticket/7052 The problem is that the recommended workaround is to dump the contenttypes app which I'm already doing!? What gives? If it makes any difference I do have some custom model permissions as documented here: http://docs.djangoproject.com/en/dev/ref/models/options/#permissions

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• ld: symbol(s) not found with OpenSSL (libssl)

  - by Benjamin

  Hi all, I'm trying to build TorTunnel on my mac. I've successfully installed the Boost library and its development files. TorTunnel also requires the OpenSSL and its development files. I've got them installed in /usr/lib/libssl.dylib and /usr/include/openssl/. When I run the make command this is the error i'm getting: g++ -ggdb -g -O2 -lssl -lboost_system-xgcc42-mt-1_38 -o torproxy TorProxy.o HybridEncryption.o Connection.o Cell.o Directory.o ServerListing.o Util.o Circuit.o CellEncrypter.o RelayCellDispatcher.o CellConsumer.o ProxyShuffler.o CreateCell.o CreatedCell.o TorTunnel.o SocksConnection.o Network.o Undefined symbols: "_BN_hex2bn", referenced from: Circuit::initializeDhParameters() in Circuit.o "_BN_free", referenced from: Circuit::~Circuit()in Circuit.o Circuit::~Circuit()in Circuit.o CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o "_DH_generate_key", referenced from: Circuit::initializeDhParameters() in Circuit.o "_PEM_read_bio_RSAPublicKey", referenced from: ServerListing::getOnionKey() in ServerListing.o "_BIO_s_mem", referenced from: Connection::initializeSSL() in Connection.o Connection::initializeSSL() in Connection.o "_DH_free", referenced from: Circuit::~Circuit()in Circuit.o "_BIO_ctrl_pending", referenced from: Connection::writeFromBuffer(boost::function)in Connection.o "_RSA_size", referenced from: HybridEncryption::encryptInSingleChunk(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o HybridEncryption::encryptInHybridChunk(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o HybridEncryption::encrypt(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o "_RSA_public_encrypt", referenced from: HybridEncryption::encryptInSingleChunk(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o HybridEncryption::encryptInHybridChunk(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o "_BN_num_bits", referenced from: CreateCell::CreateCell(unsigned short, dh_st*, rsa_st*)in CreateCell.o CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o CreatedCell::isValid() in CreatedCell.o "_SHA1", referenced from: CellEncrypter::expandKeyMaterial(unsigned char*, int, unsigned char*, int)in CellEncrypter.o "_BN_bn2bin", referenced from: CreateCell::CreateCell(unsigned short, dh_st*, rsa_st*)in CreateCell.o "_BN_bin2bn", referenced from: CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o "_DH_compute_key", referenced from: CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o "_BIO_new", referenced from: Connection::initializeSSL() in Connection.o Connection::initializeSSL() in Connection.o "_BIO_new_mem_buf", referenced from: ServerListing::getOnionKey() in ServerListing.o "_AES_ctr128_encrypt", referenced from: HybridEncryption::AES_encrypt(unsigned char*, int, unsigned char*, unsigned char*, int)in HybridEncryption.o CellEncrypter::aesOperate(Cell&, aes_key_st*, unsigned char*, unsigned char*, unsigned int*)in CellEncrypter.o "_BIO_read", referenced from: Connection::writeFromBuffer(boost::function)in Connection.o "_SHA1_Update", referenced from: CellEncrypter::calculateDigest(SHAstate_st*, RelayCell&, unsigned char*)in CellEncrypter.o CellEncrypter::initKeyMaterial(unsigned char*)in CellEncrypter.o CellEncrypter::initKeyMaterial(unsigned char*)in CellEncrypter.o "_SHA1_Final", referenced from: CellEncrypter::calculateDigest(SHAstate_st*, RelayCell&, unsigned char*)in CellEncrypter.o "_DH_size", referenced from: CreatedCell::getKeyMaterial(unsigned char**, unsigned char**)in CreatedCell.o "_DH_new", referenced from: Circuit::initializeDhParameters() in Circuit.o "_BIO_write", referenced from: Connection::readIntoBufferComplete(boost::function, boost::system::error_code const&, unsigned long)in Connection.o "_RSA_free", referenced from: Circuit::~Circuit()in Circuit.o "_BN_dup", referenced from: Circuit::initializeDhParameters() in Circuit.o Circuit::initializeDhParameters() in Circuit.o "_BN_new", referenced from: Circuit::initializeDhParameters() in Circuit.o Circuit::initializeDhParameters() in Circuit.o "_SHA1_Init", referenced from: CellEncrypter::CellEncrypter()in CellEncrypter.o CellEncrypter::CellEncrypter()in CellEncrypter.o "_RAND_bytes", referenced from: HybridEncryption::encryptInHybridChunk(unsigned char*, int, unsigned char**, int*, rsa_st*)in HybridEncryption.o Util::getRandomId() in Util.o "_AES_set_encrypt_key", referenced from: HybridEncryption::AES_encrypt(unsigned char*, int, unsigned char*, unsigned char*, int)in HybridEncryption.o CellEncrypter::initKeyMaterial(unsigned char*)in CellEncrypter.o CellEncrypter::initKeyMaterial(unsigned char*)in CellEncrypter.o "_BN_set_word", referenced from: Circuit::initializeDhParameters() in Circuit.o "_RSA_new", referenced from: ServerListing::getOnionKey() in ServerListing.o ld: symbol(s) not found collect2: ld returned 1 exit status make: *** [torproxy] Error 1 Any idea how I could fix it?

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• how to remove dynamically loaded images in javascript

  - by jesse

  I'm loading in 3 images (named 1.jpg, 2.jpg, 3jpg) dynamically to 3 divs called "div1", "div2" and "div3". function loadImages() { for (var i = 1; i < 3; i++ ) { var img = document.createElement("img"); img.src = "vegetables/"+i+".jpg"; img.id = "a"+i+""; var divName = "div"+i+""; document.getElementById(divName).appendChild(img); } } That works, but the removing part I can't seem to get to work.. function removeImages() { for (var i = 1; i < 3; i++ ) { var oldImages = "a"+i+""; var divName = "div"+i+""; document.getElementById(divName).removeChild(oldImages); } } Thank you.

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• generate random opacity number using math random

  - by TechyDude

  I am trying to generate a random number for the css opacity. This is what I tried so far. CSS .test{ position : absolute; width : 15px; height : 15px; border-radius:15px; background-color : black; }? Script $(function() { for (var i = 0; i < 300; i++) { $("<div>", { class: "test", css: { opacity: randomOpacity } }).appendTo("body"); } function randomOpacity() { var opac = 0; opac = Math.random() < 1; console.log(opac); } randomize(); });? The Fiddle

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• [JS] XMLHttpRequest problem

  - by mcco

  I am trying to do "POST" with XMLHttpRequest in a firefox extension, and after that I try to get the "Location" header and open it in a new tab. For some reason, the XMLHttpRequest doesn't contain a location header. My code function web(url,request) { var http = new XMLHttpRequest(); http.open('POST',url,true); http.setRequestHeader('Content-Type','application/x-www-form-urlencoded'); http.onreadystatechange=function() { if(http.readyState == 2) { alert(http.getResponseHeader("Location")); } } http.send(request); } Also, if I change the alert to getAllResponseHeaders() to see all headers, I just don't see the location header there. If I try to spy on the request of the original site with Firebug, it does show me the location header in the response. Please help me resolve my issues. Thanks :) P.S. I'm also unable to open a link in new tab using window.open(url, this.window.title);, but as that's not directly related to the rest of this I'll post a separate question to ask about it.

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• How does Hadoop perform input splits?

  - by Deepak Konidena

  Hi, This is a conceptual question involving Hadoop/HDFS. Lets say you have a file containing 1 billion lines. And for the sake of simplicity, lets consider that each line is of the form <k,v> where k is the offset of the line from the beginning and value is the content of the line. Now, when we say that we want to run N map tasks, does the framework split the input file into N splits and run each map task on that split? or do we have to write a partitioning function that does the N splits and run each map task on the split generated? All i want to know is, whether the splits are done internally or do we have to split the data manually? More specifically, each time the map() function is called what are its Key key and Value val parameters? Thanks, Deepak

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• Python: Filter a dictionary

  - by Adam Matan

  Hi, I have a dictionary of points, say: >>> points={'a':(3,4), 'b':(1,2), 'c':(5,5), 'd':(3,3)} I want to create a new dictionary with all the points whose x and y value is smaller than 5, i.e. points 'a', 'b' and 'd'. According to the the book, each dictionary has the items() function, which returns a list of (key, pair) tuple: >>> points.items() [('a', (3, 4)), ('c', (5, 5)), ('b', (1, 2)), ('d', (3, 3))] So I have written this: >>> for item in [i for i in points.items() if i[1][0]<5 and i[1][1]<5]: ... points_small[item[0]]=item[1] ... >>> points_small {'a': (3, 4), 'b': (1, 2), 'd': (3, 3)} Is there a more elegant way? I was expecting Python to have some super-awesome dictionary.filter(f) function... Adam

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