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• Unity on Ubuntu 11.10 - The Dash Home button brings up the panel, but is empty

  - by David M. Coe

  The dash home button brings up a panel that is greyed out, but it is totally empty. It seems to be the very same issue as this: Dash home button brings up blank window which is unanswered. /usr/lib/nux/unity_support_test -p returns OpenGL vendor string: X.Org R300 Project OpenGL renderer string: Gallium 0.4 on ATI RV370 OpenGL version string: 2.1 Mesa 7.11 Not software rendered: yes Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: yes I've tried a unity --reset but that doesn't seem to work. Unity seems to reset, but I get the following warning over and over: cs space validation failed unity What should I do next to try and fix this? Edit: Attempted fixes: I've refomatted, did not work. I've done apt-get remove unity then apt-get update then apt-get install unity, did not work. I've switched to Unity 2d and this seems to work. How can I get regualar Unity working or atleast find the error?

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• Empty list in appengine datastore: java vs python

  - by lOranger

  I have the following java model class in AppEngine: public class Xyz ... { @Persistent private Set<Long> uvw; } When saving an object Xyz with an empty set uvw in Java, I get a "null" field (as listed in the appengine datastore viewer). When I try to load the same object in python (through remote_api), as defined by the following python model class: class Xys(db.Model): uvw = db.ListProperty(int) I get a "BadValueError: Property uvw is required". When saving another object of the same class in python with an empty uvw list, the datastore viewer print a "missing" field. Apparently empty lists storage handling differs between Java and python and lead to "incompatible" objects. Thus my question: Is there a way to, either: force Java to store an empty list as a "missing" field, force Python to gracefully accept a "null" list as an empty list when loading the object? Or any other suggestion on how to handle empty list field in both languages. Thanks for your answers!

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• empty() not a valid callback?

  - by user151841

  I'm trying to use empty() in array mapping in php. I'm getting errors that it's not a valid callback. $ cat test.php <? $arrays = array( 'arrEmpty' => array( '','','' ), ); foreach ( $arrays as $key => $array ) { echo $key . "\n"; echo array_reduce( $array, "empty" ); var_dump( array_map("empty", $array) ); echo "\n\n"; } $ php test.php arrEmpty Warning: array_reduce(): The second argument, 'empty', should be a valid callback in /var/www/authentication_class/test.php on line 12 Warning: array_map(): The first argument, 'empty', should be either NULL or a valid callback in /var/www/authentication_class/test.php on line 13 NULL Shouldn't this work? Long story: I'm trying to be (too?) clever and checking that all array values are not empty strings.

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• Remove Empty Attributes from XML

  - by er4z0r

  Hi, I have a buggy xml that contains empty attributes and I have a parser that coughs on empty attributes. I have no control over the generation of the xml nor over the parser that coughs on empty attrs. So what I want to do is a pre-processing step that simply removes all empty attributes. I have managed to find the empty attribus, but now I don't know how to remove them: XPathFactory xpf = XPathFactory.newInstance(); XPath xpath = xpf.newXPath(); XPathExpression expr = xpath.compile("//@*"); Object result = expr.evaluate(d, XPathConstants.NODESET); if (result != null) { NodeList nodes = (NodeList) result; for(int node=0;node<nodes.getLength();node++) { Node n = nodes.item(node); if(isEmpty(n.getTextContent())) { this.log.warn("Found empty attribute declaration "+n.toString()); NamedNodeMap parentAttrs = n.getParentNode().getAttributes(); parentAttrs.removeNamedItem(n.getNodeName()); } } } This code gives me a NPE when accessing n.getParentNode().getAttributes(). But how can I remove the empty attribute from an element, when I cannot access the element?

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• PHP & MYSQL: How can i neglect empty variables from select

  - by cash-cash

  hello all; if i have 4 variables and i want to select DISTINCT values form data base <?php $var1 = ""; //this variable can be blank $var2 = ""; //this variable can be blank $var3 = ""; //this variable can be blank $var4 = ""; //this variable can be blank $result = mysql_query("SELECT DISTINCT title,description FROM table WHERE **keywords ='$var1' OR author='$var2' OR date='$var3' OR forums='$var4'** "); ?> note: some or all variables ($var1,$var2,$var3,$var4) can be empty what i want: i want to neglect empty fields lets say that $var1 (keywords) is empty it will select all empty fileds, but i want if $var1 is empty the result will be like $result = mysql_query("SELECT DISTINCT title,description FROM table WHERE author='$var2' OR date='$var3' OR forums='$var4' "); if $var2 is empty the result will be like $result = mysql_query("SELECT DISTINCT title,description FROM table WHERE keywords ='$var1' OR date='$var3' OR forums='$var4' "); if $var1 and $var2 are empty the result will be like $result = mysql_query("SELECT DISTINCT title,description FROM table WHERE date='$var3' OR forums='$var4' "); and so on

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• Creating an empty Drawable in Android

  - by Kai

  Creating a Drawable that is completely empty seems like a common need, as a place holder, initial state, etc., but there doesn't seem to be a good way to do this... at least in XML. Several places refer to the system resource @android:drawable/empty but as far as I can tell (i.e., it's not in the reference docs, and aapt chokes saying that it can't find the resource) this doesn't exist. Is there a general way of referencing an empty Drawable, or do you end up creating a fake empty PNG for each project?

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• Jquery: Is there some way to make val() return an empty string instead of 'undefined' for an empty list?

  - by Chris

  With Jquery, is there some way to make val() return an empty string instead of 'undefined' when called against an empty list of elements? E.g., I have this code: var x = $('#my-textbox-id').not('.watermark').val(); The idea is that I want to get the value of my textbox, but I want an empty string if it is currently showing the watermark (i don't want the watermark value!). The selector works, but i don't want 'undefined' - I want an empty string ''.

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• Visual Studio 2010 tip: Cut empty lines

  - by koevoeter

  How many times you wanted to move 2 lines by cut and pasting them, but the line you cut last is actually a blank line and your actual code is removed from the clipboard? Visual Studio 2010 has an option that keeps cutting blank lines from overwriting the clipboard. Go and uncheck this one: Tools » Options » Text Editor » All Languages » General » Apply Cut or Copy commands to blank lines when there is no selection Extra (related) tip The (free) Visual Studio 2010 extension Visual Studio 2010 Pro Power Tools contains (apart from a bunch of other handy features) the commands Edit.MoveLineUp and Edit.MoveLineDown to do whatever they say they do and maps them automatically to keyboard shortcuts Alt+Up & Alt+Down. Resharper (not-free) has similar commands for moving lines, by default mapped to Ctrl+Alt+Shift+Up/Down.

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• Empty /var/log after running cron bash script

  - by Ortix92

  I wrote a little bash script and all of a sudden my /var/log folder is completely empty except for the log I created for the bash script. This is the script I'm running every hour with cron: #!/bin/bash STL_DIR=/path/to/some/folder/i/hid LOGFILE=/var/log/stl_upload.log now=`date` echo "----------Start of Transmission----------" 2>&1 | tee -a $LOGFILE echo "Starting transfer at $now" 2>&1 | tee -a $LOGFILE rsync -av -e ssh $STL_DIR [email protected]:/users/path/folder 2>&1 | tee -a $LOGFILE echo "----------End of transmission----------" 2>&1 | tee -a $LOGFILE printf "\n" 2>&1 | tee -a $LOGFILE I want to be clear that I'm not 100% certain this is related to the empty logs folder. So if anyone could give me a pointer as to what could be going on about the reason why my log folder is empty, that'd be great.

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• Rosegarden plugin list is empty

  - by Wes

  I've just installed rosegarden through apt. I've also installed jack and a low latency kernel through a PPA https://launchpad.net/~abogani/+archive/ppa. I've started jack-server and through the control panel I can see its wiring things through rosegarden. I've also tried installing qsynth and dssi both through apt. However I can't see any plug ins in the synth plug-in list. Therefore I'm unable to test if this works. I've tried launching qsynth before rosegarden and I've tried a few things however I just can't see any plugins. Does anyone know how to get this to work? I'm using ubuntu 11.04 or 11.10 I think. sudo apt-get install rosegarden -o APT::Install-Suggests=true synaptic sudo apt-get install synaptic synaptic sudo synaptic synaptic sudo apt-add-repository ppa:abogani/ppa sudo apt-get install linux-lowlatency sudo apt-get install dssi sudo apt-get install alsa-firmware-loaders alsa-tools alsa-tools-gui alsa-firmware sudo apt-get install alsa-firmware-loaders alsa-tools alsa-tools-gui sudo apt-get install blop caps cmt fil-plugins rev-plugins swh-plugins tap-plugins sudo apt-get install blepvco mcp-plugins omins

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• Upgrade to 12.04 results to empty Dash, no date & time either on the top panel

  - by Nicolas

  I've upgraded from Ubuntu netbook remix something to 12.04 LTS, and I've got two issues. (Got an Asus eeePc 32bits, Intel 945GME x86/MMX/SSE2 and Intel Atom CPU N270 @ 1.6Ghz x2) Nothing in the Dash. Only the "home" tab, other tabs are missing. No search results whatsoever. Missing elements in the system panel, privacy and date & time. No date & time on the right corner either. I've tried to reset unity with the terminal but the process was a whole mess full of errors. It did show date & time in the system panel (not on the top-right corner) while the process was going on in the terminal. But then it was such a mess (no more icons on the right corner amongst other things), and the process wouldn't complete, so I had to reboot the computer and get Unity as before, still no date & time and privacy.

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• Interface is too empty

  - by Nade Ali

  I have recently installed Ubuntu 12.04 0n my PC without any third-party software (cause i havent been able to get my dial-up to work). When i open Ubuntu after reboot, there is absolutely nothing on the desktop screen except for an 'Untitled' folder at the corner of the screen. There is no menu, no taskbars at the top whatever. I dont know why this is happening. The .iso from which i have booted amd installed Ubuntu is fine. I have already conducted an md5sum test and it was all fine. Looking forward to your response.

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• Static Application Switcher is empty after show dekstop

  - by Jepzen

  Im using the Static Application Switcher to configure my ALT + TAB to cycle trough all applications not grouped. So far so good. Then I press Super + D to "hide all normal windows" (show desktop). This setting is from Keyboard - Shortcuts - Navigation. This also works BUT After hide all normal windows has been activated and I press ALT + TAB nothing comes up. I suspect they have been hidden so well that the Application Switcher does not longer sees them. Anyone know if this can be fixed trough settings somewhere?

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• My Generation Drivers DropdownList Empty

  - by hmloo

  I just installed MyGeneration 1.3.1 on my Windows Vista, and when I try to setup the default settings there are no drivers to select from. but it's OK in my Windows XP machine. At last I got the answers from search engine, it is caused by multi .Net Frameworks coexist and MyMeta.dll is registered by the .Net v2.0 while it should be registered with the .Net v4.0. So we have to manually register the dll. Please follow these steps: 1. Run Visual Studio Command Prompt (2010) with "Run as Administrator". 2. Enter the command "regasm.exe "C:\Program Files\MyGeneration13\MyMeta.dll" /tlb: MyMeta.tlb" 3. Exit Command Prompt when successfully registered. 4. Run MyGeneration and the proplem should be disapear. Hope this helps. Thanks for reading.

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• Empty interface to combine multiple interfaces

  - by user1109519

  Suppose you have two interfaces: interface Readable { public void read(); } interface Writable { public void write(); } In some cases the implementing objects can only support one of these but in a lot of cases the implementations will support both interfaces. The people who use the interfaces will have to do something like: // can't write to it without explicit casting Readable myObject = new MyObject(); // can't read from it without explicit casting Writable myObject = new MyObject(); // tight coupling to actual implementation MyObject myObject = new MyObject(); None of these options is terribly convenient, even more so when considering that you want this as a method parameter. One solution would be to declare a wrapping interface: interface TheWholeShabam extends Readable, Writable {} But this has one specific problem: all implementations that support both Readable and Writable have to implement TheWholeShabam if they want to be compatible with people using the interface. Even though it offers nothing apart from the guaranteed presence of both interfaces. Is there a clean solution to this problem or should I go for the wrapper interface? UPDATE It is in fact often necessary to have an object that is both readable and writable so simply seperating the concerns in the arguments is not always a clean solution. UPDATE2 (extracted as answer so it's easier to comment on) UPDATE3 Please beware that the primary usecase for this is not streams (although they too must be supported). Streams make a very specific distinction between input and output and there is a clear separation of responsibilities. Rather, think of something like a bytebuffer where you need one object you can write to and read from, one object that has a very specific state attached to it. These objects exist because they are very useful for some things like asynchronous I/O, encodings,...

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• Software Center empty "No usefulness from server" "no username in config file"

  - by Theron G. Burrough

  I upgraded to 12.04 LTS and ran Software Center while a few things were running, and crashed. (2 GB RAM on a Netbook.) On reboot, Ubuntu One interface would not find any programs, neither installed (to run) nor available for download. So I launched Software Center, which opens, but does nothing. I click "Close" button and get a "Force Quit?" box. So I quit. Did research, learned to run Software Center from Terminal: 2012-04-29 23:14:36,978 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file Then tried the below without success: Reinstallation of software center: sudo apt-get install --reinstall software-center Didn't work. Found this in a post: remove the config file for software-center then log out and back in sudo rm -rf ~/.config/software-center Didn't work. Reinstalled Software Center with Synaptic Package Manager. Still no dice! And I am a Linux newbie, so I don't know where the Dickens that config file is. Help appreciated.

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• C++ Windows Forms application unhandled exception error when textbox empty

  - by cmorris1441

  I'm building a temperature conversion application in Visual Studio for a C++ course. It's a Windows Forms application and the code that I've written is below. There's other code to of course, but I'm not sure you need it to help me. My problem is, when I run the application if I don't have anything entered into either the txtFahrenheit or txtCelsius2 textboxes I get the following error: "An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll" The application only works right now when a number is entered into both of the textboxes. I was told to try and use this: Double::TryParse() but I'm brand new to C++ and can't figure out how to use it, even after checking the MSDN library. Here's my code: private: System::Void btnFtoC_Click(System::Object^ sender, System::EventArgs^ e) { // Convert the input in the Fahrenheit textbox to a double datatype named fahrenheit for manipulation double fahrenheit = Convert::ToDouble(txtFahrenheit->Text); // Set the result string to F * (5/9) -32 double result = fahrenheit * .5556 - 32; // Set the Celsius text box to display the result string txtCelsius->Text = result.ToString(); } private: System::Void btnCtoF_Click(System::Object^ sender, System::EventArgs^ e) { // Convert the input in the Celsius textbox to a double datatype name celsius for manipulation double celsius = Convert::ToDouble(txtCelsius2->Text); // Set the result2 string to C * (9/5) + 32 double result2 = celsius * 1.8 + 32; // Set the Fahrenheit text box to display the result2 string txtFahrenheit2->Text = result2.ToString(); }

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• after changing file from unix to dos it is having empty lines..how to handle this

  - by user2814717

  After converting file using **unix2dos** command it is having some empty lines. Please help me. How to handle this? I tried to delete empty lines as follow, but couldn't work. $ sed '/^$/d' /tmp/data.txt Hey following examples also didn't work. Pl help This is source data before using unix2dos. ID NAME DATE 1 BALA 09/23/2013 2 KRISHH 09/24/2013 3 billy 09/24/2013 After using unix2dos it is coming as ID NAME DATE 1 BALA 09/23/2013 2 KRISHH 09/24/2013 3 billy 09/24/2013 first and second record there is an empty line coming up..may be in bewteen data also Thanks

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• AS3 - At exactly 23 empty alpha channels, images below stop drawing

  - by user46851

  I noticed, while trying to draw large numbers of circles, that occasionally, there would be some kind of visual bug where some circles wouldn't draw properly. Well, I narrowed it down, and have noticed that if there is 23 or more objects with 00 for an alpha value on the same spot, then the objects below don't draw. It appears to be on a pixel-by-pixel basis, since parts of the image still draw. Originally, this problem was noticed with a class that inherited Sprite. It was confirmed to also be a problem with Sprites, and now Bitmaps, too. If anyone can find a lower-level class than Bitmap which doesn't have this problem, please speak up so we can try to find the origin of the problem. I prepared a small test class that demonstrates what I mean. You can change the integer value at line 20 in order to see the three tests I came up with to clearly show the problem. Is there any kind of workaround, or is this just a limit that I have to work with? Has anyone experienced this before? Is it possible I'm doing something wrong, despite the bare-bones implementation? package { import flash.display.Sprite; import flash.events.Event; import flash.display.Bitmap; import flash.display.BitmapData; public class Main extends Sprite { public function Main():void { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); // entry point Test(3); } private function Test(testInt:int):void { if(testInt==1){ addChild(new Bitmap(new BitmapData(200, 200, true, 0xFFFF0000))); for (var i:int = 0; i < 22; i++) { addChild(new Bitmap(new BitmapData(100, 100, true, 0x00000000))); } } if(testInt==2){ addChild(new Bitmap(new BitmapData(200, 200, true, 0xFFFF0000))); for (var j:int = 0; j < 23; j++) { addChild(new Bitmap(new BitmapData(100, 100, true, 0x00000000))); } } if(testInt==3){ addChild(new Bitmap(new BitmapData(200, 200, true, 0xFFFF0000))); for (var k:int = 0; k < 22; k++) { addChild(new Bitmap(new BitmapData(100, 100, true, 0x00000000))); } var M:Bitmap = new Bitmap(new BitmapData(100, 100, true, 0x00000000)); M.x += 50; M.y += 50; addChild(M); } } } }

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• logging with Openbox / Gnome shows empty Desktop

  - by Sandking

  I installed new 12.04 and Openbox. I logged in with GNOME/Openbox and now after system starts I see only Desktop background image and nothing more. When I right click I can do normal GNOME actions like create folder and nothing more really. alt+f2 doesn't start run window though I managed to create a folder and then with Nautilus start terminal but I really don't know what to do next. Two questions: Why doesn't Openbox start properly? How in this situation I can get back to GDM login screen and choose other option to log in?

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• Empty Disk when trying to install dual-boot system

  - by Lambda Dusk

  I recently purchased an SSD to speed up my computer experience. Before, I had Windows 7 and Ubuntu in a dual-boot system. The plan was to install Windows 8 on the SSD and then set aside ~30GB for the system files of Ubuntu. I installed Windows 8 just fine on the SSD, then I booted the Ubuntu install CD to make my partitions like always - but GParted tells me the entire SSD is unallocated. Now I am afraid I will lose my Windows installation if I try to do anything to it. Why does GParted think there is no partition on the SSD? Shouldn't it be 4 Partitions, like the Windows installer told me? And is it possible to ignore this and install Ubuntu on the hard disk (where it, frankly, already is) and somehow make it possible to install GRUB on the SSD to revert my dual-boot system without damaging the installed Win8?

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• Falsey values vs null, undefned, or empty string

  - by user687554

  I've worked with jQuery over the years. However, recently, I've found myself getting deeper into the JavaScript language. Recently, I've heard about "truthy" and falsey values. However, I don't fully understand them. Currently, I have some code that looks like this: var fields = options.fields || ['id', 'query']; I need to identify if fields is null, undefined, or has a length of 0. I know the long way is to do: if ((fields === null) || (fields === undefined) || (fields.length === 0)) { ... } My question is, is the following the same: if (!fields) { ... } Thank you!

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• how to set up ubuntu in an empty partition i created on my laptop hd

  - by user208472

  I took 50 gigs of space and partitioned it off in windows. I then removed rights from any user with access to the computer as it is part of a domain. I'm not pc literate enough to know exactly which options to select in order to install ubuntu into the partition. I do not know which selections to make for the otions that are shown on the partition window during the installation process. If anyone could inform me how to correctly do this it would be much appreciated !

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• PHP mySQL count number of fields not empty

  - by Pez Cuckow

  I have a database of users where they can send messages to other users (up to four) and the ID of the message they sent is in their user row. e.g. Name, Email, Msg1, Msg2, Msg3, Msg4 Pez, [email protected], 1, 55, 42, 5 //Send 4 messages Steve, [email protected], 0, 0, 0, 0 //Send 0 messages Leon, [email protected], 3, 0, 3, 5 //Send 3 messages How in a MySQL query can I get the amount of those message rows that are not empty or not equal to 0, allowing me to order by that? So it would return Pez - 4 Mesasges Leon - 3 Messages Steve - 0 Messages Im my mind something like order by count(!empty(msg1)+!empty(msg2)+!empty(msg3)+!empty(msg4)) Many thanks,

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• Jquery validations on form with no fields

  - by jcovert

  I have a table (in a form) populated with radio buttons (with a button for each value in a collection). If the collection is empty, nothing shows up in the table (which is fine). (I'm using Struts2) My trouble comes when validating that the user has selected one of these radio buttons when the submit button is clicked. I'm using JQUERY validations, and it works quite well UNLESS there are no radio buttons to select (collection is empty). $('#startProcessForm').validate({ rules: { selectedProcess: { required: true } }, messages: { selectedProcess: "Please select a process to start." } }); If the list IS empty, then there are no fields (radio button or otherwise) named "selectedProcess". So my question is this: How can I make "selectedProcess" exist AND fail the 'required:true' validation if there's nothing in the collection? I was thinking I could create an empty tag of the same name (selectedProcess) if the collection is empty? Here's what I'd guess would work but doesn't seem to: <s:if test="processes != null && !processes.isEmpty()"> <s:iterator value="processes" status="processesStatus"> <tr> <td><s:radio name="selectedProcess" list="{name}"></s:radio></td> </tr> </s:iterator> </s:if> <s:else> <tr> <td><a name="selectedProcess"></a></td> </tr> </s:else> Thanks!

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