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Articles indexed in April 2012

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• Ubuntu installation does not recognize drive partinioning

  - by Woltan

  I have a 1TB drive and installed Windows 7 on a 128GB partition. When I now try to install Ubuntu 11.04 it does not recognize the Windows partition but offers the complete 1TB drive to install Ubuntu on instead. It displays: However, in the Ubuntu Disk Utility the Windows partitions are recognized. What do I need to do in order for Ubuntu to recognize the Windows 7 partition and install Ubuntu as a dual boot? Response to comments The following commands were executed and the results are shown below: fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x34a38165 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 13 16318 130969600 7 HPFS/NTFS Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x14a714a6 Device Boot Start End Blocks Id System /dev/sdb1 1 60801 488384001 83 Linux parted -l Warning: Unable to open /dev/sr0 read-write (Read-only file system). /dev/sr0 has been opened read-only. Error: /dev/sr0: unrecognised disk label

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• How to troubleshoot GPU freezes?

  - by dlsmith2

  So in advance I'll just say I am a total linux newbie, so be kind. I just downloaded Ubuntu 11.10 and this is my first experience with Linux. I enjoy it so far and actually enjoy it except for when my computer freezes. This has been quite often so far. I've done a little research and it seems my problem is with the GPU. When it does freeze I can move the cursor but cannot click on anything. I also cannot run Alt+F2 xkill. So my only previous experience has been with Windows and I would normally solve an issue like this with Ctrl+Alt+Delete and just shut down the offending program. I do not know how to do this in Ubuntu and not even sure this would even work. Please help me if you can, how do I deal with a freeze without having to resort to a hard shutdown, I cannot seem to run the computer over one hour without experiencing this issue. I tried accessing my GRUB menu on startup but I can't even seem to do that. Also the only real program I have been running whenever this happens seems to be Firefox. Thank you, appreciate any help. After running lspci | grep VGA command prompt: 00:12.0 VGA compatible controller: nVidia Corporation C67 [GeForce 7150M / nForce 630M] (rev a2)*****

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• "Serious errors found HF checking the drive for /home" After Moving /home to external HFSplus partition

  - by Arctic Shadow

  I just installed Mac OS X 10.7 "Lion" and Ubuntu 11.10 on my MacBook Pro. Using these instructions: tuxation.com/creating-home-partition-mac-linux.html . After changing the location of my home folder to the new location, it gives me the error in the title, and my username no longer appears in the login screen. Using the "Other" option with my username seems to make it try to log in, but the screen quickly flashes between blank and a shell before kicking me back to the login screen without notice. I'm trying to share my home folder between Mac OS X and Ubuntu, using an hfsplus partition (unjournaled) between the two. The home partition seems to mount fine as /home, and I am able to modify it under Ubuntu. Below is the line I've added to fstab: /dev/sda3 /home hfsplus defaults 0 1 I should also note that I changed my account's username and home directory location to match this, though I've double checked that and everything seems in order there... Thank you in advance for any assistance. Edit: It seems that the /etc/passwd file didn't have my new home directory's location in it, so I changed that, and I am now able to log into my account, although I am still not listed in the login screen, and my username in the menu on the top right shows up as "[Invalid UTF-8]"...

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• Why does the file lens not search mounted samba shares?

  - by Kaput1982

  I've got several samba shares mounted in my home directory (mounted with the "mount.cifs" command). I can browse the shares just fine. From Nautilus I can search them just fine. My question is why doesn't the dash file lens search the mounts as well? I've also noticed files I open from the shares do not show up as recently used (again in the file lens). I've Googled around and I've been unable to come up with any thing.

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• What could be the reason for my resolution to be right running 11.10 on VirtualBox and not on machine?

  - by Hadrian de Oliveira

  When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well. But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox). What could be the reason for this happening? (Could the VB guest software influence on this?)

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• How to create a bootable system with a squashfs root

  - by cldfzn

  My goal is to be able to take a customized root file system loaded with the software I want. So far I've created a squashed filesystem using debootstrap and chroot to install the software I want on the system. The problem I am now running in to.. whenever I boot in to the system, my user accounts that were set up in the chroot do not work. First boot everything works out, second boot I can't log in. That is baffling to me. Any one know a reason or a place to start looking? Update To get a working system with a squashfs filesystem: sudo apt-get install live-boot live-boot-initramfs-tools extlinux sudo update-initramfs -u Create a squashfs file from a bootstrapped or running ubuntu filesystem with whatever packages you want available. https://help.ubuntu.com/community/LiveCDCustomizationFromScratch provides good instructions for creating a debootstrapped system to build on. Format the target drive with ext2/3/4 and enable the bootable flag. Create the folder layout on the target drive and install extlinux: mkdir -p ${TARGET}/boot/extlinux ${TARGET}/live extlinux -i ${TARGET}/boot/extlinux dd if=/usr/lib/syslinux/mbr.bin of=/dev/sdX #X is the drive letter cp /boot/vmlinuz-$(uname -r) ${TARGET}/boot/vmlinuz cp /boot/initrd.img-$(uname -r) ${TARGET}/boot/initrd cp filesystem.squashfs ${TARGET}/live Create ${TARGET}/boot/extlinux/extlinux.conf with the following contents: DEFAULT Live LABEL Live KERNEL /boot/vmlinuz APPEND initrd=/boot/initrd boot=live toram=filesystem.squashfs TIMEOUT 10 PROMPT 0 Now you should be able to boot from the target drive in to your squashed system.

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• Is hiding content with JavaScript or "text-indent: -9999px" bad for SEO?

  - by Samuel

  So apparently hiding content using "display: none" is bad for SEO and seen by googlebot as being deceptive. This according to a lot of the posts I read online and questions even on this site. But what if I hide keyword rich text using javascript? A jquery example: $(function() { $('#keywordRichTextContainer').hide(); }); or using visibility hidden: $(function() { $('#keywordRichTextContainer').css({ visibility: 'hidden', position: 'absolute' }); }); Would any of these techniques cause my site to be penalized? If googlebot can't read javascript then if I'm hiding through js it shouldn't know right? What about using "text-indent: -9999px"?

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• Incorporating XNA into an existing project

  - by Boreal

  My game as-is is using IrrlichtLime, which I'm beginning to dislike because it hides a lot of implementation and makes adding your own implementation incredibly complex. I don't really need the scene manager for anything and the only animation I need is manual (i.e. transforming the bones programmatically). However, I've only ever used XNA in the past as a starting point with the templates. How would I take my current project and add XNA to it?

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• std::vector::size with glDrawElements crashes?

  - by NoobScratcher

  ( win32 / OpenGL 3.3 / GLSL 330 ) I decided after a long time of trying to do a graphical user interface using just opengl graphics to go back to a gui toolkit and so in the process have had to port alot of my code to win32. But I have a problem with my glDrawElement function. my program compiles and runs fine until it gets to glDrawElements then crashes.. which is rather annoying right. so I was trying to figure out why and I found out its std::vector::size member not returning the correct amount of faces in the unsigned interger vector eg, "vector<unsigned int>faces; " so when I use cout << faces.size() << endl; I got 68 elements???? instead of 24 as you can see here in this .obj file: # Blender v2.61 (sub 0) OBJ File: '' # www.blender.org v 1.000000 -1.000000 -1.000000 v 1.000000 -1.000000 1.000000 v -1.000000 -1.000000 1.000000 v -1.000000 -1.000000 -1.000000 v 1.000000 1.000000 -0.999999 v 0.999999 1.000000 1.000001 v -1.000000 1.000000 1.000000 v -1.000000 1.000000 -1.000000 s off f 1 2 3 4 f 5 8 7 6 f 1 5 6 2 f 2 6 7 3 <--- 24 Faces not 68? f 3 7 8 4 f 5 1 4 8 I'm using a parser I created to get the faces/vertexes in my .obj file: char modelbuffer [20000]; int MAX_BUFF = 20000; unsigned int face[3]; FILE * pfile; pfile = fopen(szFileName, "rw"); while(fgets(modelbuffer, MAX_BUFF, pfile) != NULL) { if('v') { Point p; sscanf(modelbuffer, "v %f %f %f", &p.x, &p.y, &p.z); points.push_back(p); cout << " p.x = " << p.x << " p.y = " << p.y << " p.z = " << p.x << endl; } if('f') { sscanf(modelbuffer, "f %d %d %d %d", &face[0], &face[1], &face[2], &face[3]); cout << "face[0] = " << face[0] << " face[1] = " << face[1] << " face[2] = " << face[2] << " face[3] = " << face[3] << "\n"; faces.push_back(face[0] - 1); faces.push_back(face[1] - 1); faces.push_back(face[2] - 1); faces.push_back(face[3] - 1); cout << face[0] - 1 << face[1] - 1 << face[2] - 1 << face[3] - 1 << endl; } } using this struct to store the x,y,z positions also this vector was used with Point: vector<Point>points; struct Point { float x, y, z; }; If someone could tell me why its not working and how to fix it that would be awesome I also provide a pastebin to the full source code if you want a closer look. http://pastebin.com/gznYLVw7

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• Unable to find good parameters for behavior of a puck in Farseer

  - by Krumelur

  EDIT: I have tried all kinds of variations now. The last one was to adjust the linear velocity in each step: newVel = oldVel * 0.9f - all of this including your proposals kind of work, however in the end if the velocity is little enough, the puck sticks to the wall and slides either vertically or horizontally. I can't get rid of this behavior. I want it to bounce, no matter how slow it is. Retitution is 1 for all objects, Friction is 0 for all. There is no gravity. What am I possibly doing wrong? In my battle to learn and understand Farseer I'm trying to setup a simple Air Hockey like table with a puck on it. The table's border body is made up from: Vertices aBorders = new Vertices( 4 ); aBorders.Add( new Vector2( -fHalfWidth, fHalfHeight ) ); aBorders.Add( new Vector2( fHalfWidth, fHalfHeight ) ); aBorders.Add( new Vector2( fHalfWidth, -fHalfHeight ) ); aBorders.Add( new Vector2( -fHalfWidth, -fHalfHeight ) ); FixtureFactory.AttachLoopShape( aBorders, this ); this.CollisionCategories = Category.All; this.CollidesWith = Category.All; this.Position = Vector2.Zero; this.Restitution = 1f; this.Friction = 0f; The puck body is defined with: FixtureFactory.AttachCircle( DIAMETER_PHYSIC_UNITS / 2f, 0.5f, this ); this.Restitution = 0.1f; this.Friction = 0.5f; this.BodyType = FarseerPhysics.Dynamics.BodyType.Dynamic; this.LinearDamping = 0.5f; this.Mass = 0.2f; I'm applying a linear force to the puck: this.oPuck.ApplyLinearImpulse( new Vector2( 1f, 1f ) ); The problem is that the puck and the walls appear to be sticky. This means that the puck's velocity drops to zero to quickly below a certain velocity. The puck gets reflected by the walls a couple of times and then just sticks to the left wall and continues sliding downwards the left wall. This looks very unrealistic. What I'm really looking for is that a puck-wall-collision does slow down the puck only a tiny little bit. After tweaking all values left and right I was wondering if I'm doing something wrong. Maybe some expert can comment on the parameters?

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• HedgeWar code confusion

  - by BluFire

  I looked at an open source project(HedgeWars) that was built using many programming languages such as C++ and Java. While I was looking through the code, I couldn't help noticing that all the math and physics were gone from the Java code. HedgeWars I imported the project file called "SDL-android-project" which was a sub folder to "android build" and project files. My question is where is all the math and physics inside the code? Do I have to look at the C++ code in order to see it? I think Hedgewars was originally programmed in C++ but the files are confusing be because of its size and the fact that it has several programming languages inside.

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• In some games, we just let the main() loop be the Player object or Table object?

  - by ????

  I was thinking that let's say if there is a game of Blackjack or MasterMind, then we should have a class called Dealer or ComputerPal, which is how the computer interact with us (as a dealer for Blackjack or as the person giving hints for MasterMind). And then there should be a Player object, and the way to play one game is aPlayer.playGame but I noticed that a book was just using the main() loop to act as the player (or as the Controller of the game), calling the Dealer methods to dealer the cards, ask for player's action, etc... 1) Is this just a lazy way to model all the proper objects? 2) If more objects are to be added, who should call the aDealer.dealCards and then ask for aPlayer.askForAction? (because it is strange to let the Player handle all the logical steps). Should there be a Table object that handle all these logic and then to play one round of game, use aTable.playGame? What is a good object design for such game?

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• XNA - How do I change the texture of a 2D object?

  - by Adorjan

  I am on to make a table game, I successfully figured out how to make the arraw and to move the cursor on it (by tiles). Now I wanna find out how to make that if I hit the Enter key the tile's texture change to another. I tryed like this: if (input.KeyPressed(Keys.Enter)) { cell[X,Y].Cell_texture = tile_texture; } but it doesn't really work. Hope you can help. :) Thanks!

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• HTML5 clicking objects in canvas

  - by Dave

  I have a function in my JS that gets the user's mouse click on the canvas. Now lets say I have a random shape on my canvas (really its a PNG image which is rectangular) but i don't want to include any alpha space. My issue lies with lets say i click some where and it involves a pixel of one of the images. The first issue is how do you work out the pixel location is an object on the map (and not the grass tiles behind). Secondly if i clicked said image, if each image contains its own unique information how do you process the click to load the correct data. Note I don't use libraries I personally prefer the raw method. Relying on libraries doesn't teach me much I find.

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• Form Design ScriptControlClass

  - by raghumithra

  I am working on a form designer. We have two parts: first is designing form by placing controls, and second is writing VB code in rich text editor. How do i integrate design and code (events of the controls) in runtime? I am using ScriptControlClass Form4 f4 = new Form4(); f4.Name = "dgfdfg"; f4.Text = "Raghudfgmithra"; Button btn = new Button(); btn.Text = "HI"; btn.Left = 25; btn.Top = 50; btn.Name = "btnSubmit"; f4.Controls.Add(btn); script.AddObject("form", f4, true); script.AddCode("???????????); script.ExecuteStatement(????????????);

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• how to connect to ethernet printer throught python?

  - by Prasanth

  How can i connect and send data to a Ethernet receipt printer Epson-T88V through python2.7, i have set the ipaddress of the Ethernet printer manually and the utility software communication is also successful. How do i detect and connect to these printers and send data to print. Is there and module for Ethernet connection in python. Using more than one Ethernet printer and separate data to be printed simultaneously from a single system, i am using windows xp and python 2.7 hope i am clear Thanks.

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• Memory leak when declaring NSString from ABRecordCopyValue

  - by Ben Thompson

  I am using the following line of code... NSString *clientFirstName = (NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty); The 'analyse' feature on Xcode is saying that this giving rise to a potential memory leak. I am not releasing clientFirstName at all as I have neither alloc or retain'd it. However, I am conscious that ABRecordCopyValue may not be returning an object as say a command like [NSMutableArray arrayWithArray:someArray] would which might mean I am indeed creating a new object that I control and must release. Keen to hear thoughts...

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• How set the response header's Cache-Control in Sitecore?

  - by user822211

  By default, it looks like Sitecore does not cache pages. In web.config, set this <setting name="DisableBrowserCaching" value="false"/> and create pipeline processor page.Response.Cache.SetExpires(DateTime.Now.AddSeconds(60)); page.Response.Cache.SetCacheability(HttpCacheability.Public); but it did not work, the repose head stays no-cache. By the way, I add the pipeline in the renderLayout, anyone knows? thanks!

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• Why does String.Equals(Object obj) check to see if this == null?

  - by m-y

  // Determines whether two strings match. [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] public override bool Equals(Object obj) { //this is necessary to guard against reverse-pinvokes and //other callers who do not use the callvirt instruction if (this == null) throw new NullReferenceException(); String str = obj as String; if (str == null) return false; if (Object.ReferenceEquals(this, obj)) return true; return EqualsHelper(this, str); } The part I don't understand is the fact that it is checking for the current instance, this, against null. The comment is a bit confusing, so I was wondering what does that comment actually mean? Can anyone give an example of how this could break if that check was not there, and does this mean that I should also place that check in my classes?

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• Is a live internet connection required for push notification?

  - by Heshan Perera

  This maybe a silly question, but I need confirmation and I have no one else to ask. I am trying to understand the implications of implementing my own push notification for android mobile devices. This requires a continuous TCP connection to a server, though most of the time it will be idle. My assumption is that, even when idle, for the server to be able to push data to the client through the TCP connection, an active internet connection will always be required, and if the connection is disrupted (i.e. the user switches the connection off) this push will no longer be possible. Is this assumption correct ?

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• Facebook Like button - comment box with breif description and image

  - by Dave Smith

  On my website when the user selects the facebook like button they have the option to enter comments. This popup window to enter comments only contains the users avatar and place to enter comments. How can i include my pic and a brief description of the site directly below the comment??? At first I thought it was from the HTML title attribute or meta property="og:title" ... but populating these have no affect I have another site that contains both pic and a desc below the comment but the pic seems to be grabed at random -but always the same- from the site and the short desc I thought from the -title- attribute but its not - I changed the -title- and it still shows the same desc, its like its cached??? Any ideas how to control or populate a brief description and image within the comment section of a like button???

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• How to make buttons in python/pygame?

  - by user1334014

  I'm making a game in pygame and on the first screen I want there to be buttons that you can press to (i) start the game, (ii) load a new screen with instructions, and (iii) exit the program. I've found this code online for button making, but I don't really understand it (I'm not that good at object oriented programming). If I could get some explanation as to what it's doing that would be great. Also, when I use it and try to open a file on my computer using the file path, I get the error sh: filepath :Permission denied, which I don't know how to solve. #load_image is used in most pygame programs for loading images def load_image(name, colorkey=None): fullname = os.path.join('data', name) try: image = pygame.image.load(fullname) except pygame.error, message: print 'Cannot load image:', fullname raise SystemExit, message image = image.convert() if colorkey is not None: if colorkey is -1: colorkey = image.get_at((0,0)) image.set_colorkey(colorkey, RLEACCEL) return image, image.get_rect() class Button(pygame.sprite.Sprite): """Class used to create a button, use setCords to set position of topleft corner. Method pressed() returns a boolean and should be called inside the input loop.""" def __init__(self): pygame.sprite.Sprite.__init__(self) self.image, self.rect = load_image('button.png', -1) def setCords(self,x,y): self.rect.topleft = x,y def pressed(self,mouse): if mouse[0] > self.rect.topleft[0]: if mouse[1] > self.rect.topleft[1]: if mouse[0] < self.rect.bottomright[0]: if mouse[1] < self.rect.bottomright[1]: return True else: return False else: return False else: return False else: return False def main(): button = Button() #Button class is created button.setCords(200,200) #Button is displayed at 200,200 while 1: for event in pygame.event.get(): if event.type == MOUSEBUTTONDOWN: mouse = pygame.mouse.get_pos() if button.pressed(mouse): #Button's pressed method is called print ('button hit') if __name__ == '__main__': main() Thank you to anyone who can help me.

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• Translating a C# WCF app into Visual Basic

  - by MikeG

  I'm trying to write a simple/small Windows Communication Foundation service application in Visual Basic (but I am very novice in VB) and all the good examples I've found on the net are written in C#. So far I've gotten my WCF service application working but now I'm trying to add callback functionality and the program has gotten more complicated. In the C# example code I understand how everything works but I am having trouble translating into VB the portion of code that uses a delegate. Can someone please show the VB equivalent? Here is the C# code sample I'm using for reference: namespace WCFCallbacks { using System; using System.ServiceModel; [ServiceContract(CallbackContract = typeof(IMessageCallback))] public interface IMessage { [OperationContract] void AddMessage(string message); [OperationContract] bool Subscribe(); [OperationContract] bool Unsubscribe(); } interface IMessageCallback { [OperationContract(IsOneWay = true)] void OnMessageAdded(string message, DateTime timestamp); } } namespace WCFCallbacks { using System; using System.Collections.Generic; using System.ServiceModel; public class MessageService : IMessage { private static readonly List<IMessageCallback> subscribers = new List<IMessageCallback>(); //The code in this AddMessage method is what I'd like to see re-written in VB... public void AddMessage(string message) { subscribers.ForEach(delegate(IMessageCallback callback) { if (((ICommunicationObject)callback).State == CommunicationState.Opened) { callback.OnMessageAdded(message, DateTime.Now); } else { subscribers.Remove(callback); } }); } public bool Subscribe() { try { IMessageCallback callback = OperationContext.Current.GetCallbackChannel<IMessageCallback>(); if (!subscribers.Contains(callback)) subscribers.Add(callback); return true; } catch { return false; } } public bool Unsubscribe() { try { IMessageCallback callback = OperationContext.Current.GetCallbackChannel<IMessageCallback>(); if (!subscribers.Contains(callback)) subscribers.Remove(callback); return true; } catch { return false; } } } } I was thinking I could do something like this but I don't know how to pass the message string from AddMessage to DoSomething... Dim subscribers As New List(Of IMessageCallback) Public Sub AddMessage(ByVal message As String) Implements IMessage.AddMessage Dim action As Action(Of IMessageCallback) action = AddressOf DoSomething subscribers.ForEach(action) 'Or this instead of the above three lines: 'subscribers.ForEach(AddressOf DoSomething) End Sub Public Sub DoSomething(ByVal callback As IMessageCallback) 'I am also confused by: '((ICommunicationObject)callback).State 'Is that casting the callback object as type ICommunicationObject? 'How is that done in VB? End Sub

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• AJAX: Permission denied to access property in iframe

  - by Muhammad Sajid

  Hi I created an php website which uses for AJAX post and was live at http://sprook.com.au/ but my client change it's domain to http://www.sprookit.net/ from his service provider Godaddy and now the firebug says: Permission denied to access property 'stopAjax' here stopAjax is my method name. script is there: <div class="post_area"> <form action="post.php" method="post" id="addVideo" enctype="multipart/form-data" target="post" onsubmit="return startAjax(this);"> <iframe id="post" name="post" src="#" style="width:0;height:0;border:0px solid #fff;"></iframe> <table width="860" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="435">POST YOUR AD FREE<br /> <em>Paste embed code from YouTube</em></td> <td width="322"><input type="text" id="videoLink" name="videoLink" class="input_textbox" /> </td> <td width="95"><input type="submit" name="set_video_link" id="set_video_link" value="" class="submt_post" /> </td> </tr> <tr> <td>&nbsp;</td> <td><div id="process"> Connecting please wait <img src="images/loading.gif" /><br/> </div></td> </tr> </table> </form> </div> And all content comes from old domain i removed index file and it stoped working, therefore it is cleared that scripts run from old domain.

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• Build Path issue with Java Android project when starting Eclipse

  - by Matt Smith

  I booted up eclipse to start on a project, and without typing in a word I already have several errors. package department.namespace; import android.app.Activity; import android.os.Bundle; public class DepartmentActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } } At package department.namespace, it says: multiple marks at this line and the type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files The import android.os cannot be resolved. Override cannot be resolved as a type The method OnCreate(Bundle) is undefined for the type Activity R. cannot be resolved as a variable. Since this JUST came up when I started Eclipse, how do I fix this?

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