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• The Growing Importance of Network Virtualization

  - by user12608550

  The Growing Importance of Network Virtualization We often focus on server virtualization when we discuss cloud computing, but just as often we neglect to consider some of the critical implications of that technology. The ability to create virtual environments (or VEs [1]) means that we can create, destroy, activate and deactivate, and more importantly, MOVE them around within the cloud infrastructure. This elasticity and mobility has profound implications for how network services are defined, managed, and used to provide cloud services. It's not just servers that benefit from virtualization, it's the network as well. Network virtualization is becoming a hot topic, and not just for discussion but for companies like Oracle and others who have recently acquired net virtualization companies [2,3]. But even before this topic became so prominent, Solaris engineers were working on technologies in Solaris 11 to virtualize network services, known as Project Crossbow [4]. And why is network virtualization so important? Because old assumptions about network devices, topology, and management must be re-examined in light of the self-service, elasticity, and resource sharing requirements of cloud computing infrastructures. Static, hierarchical network designs, and inter-system traffic flows, need to be reconsidered and quite likely re-architected to take advantage of new features like virtual NICs and switches, bandwidth control, load balancing, and traffic isolation. For example, traditional multi-tier Web services (Web server, App server, DB server) that share net traffic over Ethernet wires can now be virtualized and hosted on shared-resource systems that communicate within a larger server at system bus speeds, increasing performance and reducing wired network traffic. And virtualized traffic flows can be monitored and adjusted as needed to optimize network performance for dynamically changing cloud workloads. Additionally, as VEs come and go and move around in the cloud, static network configuration methods cannot easily accommodate the routing and addressing flexibility that VE mobility implies; virtualizing the network itself is a requirement. Oracle Solaris 11 [5] includes key network virtualization technologies needed to implement cloud computing infrastructures. It includes features for the creation and management of virtual NICs and switches, and for the allocation and control of the traffic flows among VEs [6]. Additionally it allows for both sharing and dedication of hardware components to network tasks, such as allocating specific CPUs and vNICs to VEs, and even protocol-specific management of traffic. So, have a look at your current network topology and management practices in view of evolving cloud computing technologies. And don't simply duplicate the physical architecture of servers and connections in a virtualized environment…rethink the traffic flows among VEs and how they can be optimized using Oracle Solaris 11 and other Oracle products and services. [1] I use the term "virtual environment" or VE here instead of the more commonly used "virtual machine" or VM, because not all virtualized operating system environments are full OS kernels under the control of a hypervisor…in other words, not all VEs are VMs. In particular, VEs include Oracle Solaris zones, as well as SPARC VMs (previously called LDoms), and x86-based Solaris and Linux VMs running under hypervisors such as OEL, Xen, KVM, or VMware. [2] Oracle follows VMware into network virtualization space with Xsigo purchase; http://www.mercurynews.com/business/ci_21191001/oracle-follows-vmware-into-network-virtualization-space-xsigo [3] Oracle Buys Xsigo; http://www.oracle.com/us/corporate/press/1721421 [4] Oracle Solaris 11 Networking Virtualization Technology, http://www.oracle.com/technetwork/server-storage/solaris11/technologies/networkvirtualization-312278.html [5] Oracle Solaris 11; http://www.oracle.com/us/products/servers-storage/solaris/solaris11/overview/index.html [6] For example, the Solaris 11 'dladm' command can be used to limit the bandwidth of a virtual NIC, as follows: dladm create-vnic -l net0 -p maxbw=100M vnic0

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• Extreme Makeover, Phone Edition: Comcasts xfinity

  Mobile Makeover For many companies the first foray into Windows Phone 7 (WP7) may be in porting their existing mobile apps. It is tempting to simply transfer existing functionality, avoiding the additional design costs. Readdressing business needs and taking advantage of the WP7 platform can reduce cost and is essential to a successful re-launch. To better understand the advantage of new development lets examine a conceptual upgrade of Comcasts existing mobile app. Before Comcast has a great mobile app that provides several key features. The ability to browse the lineup using a guide, a client for Comcast email accounts, On Demand gallery, and much more. We will leverage these and build on them using some of the incredible WP7 features.   After With the proliferation of DVRs (Digital Video Recorders) and a variety of media devices (TV, PC, Mobile) content providers are challenged to find creative ways to build their brands. Every client touch point must provide both value added services as well as opportunities for marketing and up-sale; WP7 makes it easy to focus on those opportunities. The new app is an excellent vehicle for presenting Comcasts newly rebranded TV, Voice, and Internet services. These services now fly under the banner of xfinity and have been expanded to provide the best experience for Comcast customers. The Windows Phone 7 app will increase the surface area of this service revolution.   The home menu is simplified and highlights Comcasts Triple Play: Voice, TV, and Internet. The inbox has been replaced with a messages view, and message management is handled by a WP7 hub. The hub presents emails, tweets, and IMs from Comcast and other viewers the user follows on Twitter.  The popular view orders shows based on the users viewing history and current cable package. The first show Glee is both popular and participating in a conceptual co-marketing effort, so it receives prime positioning. The second spot goes to a hit show on a premium channel, in this example HBOs The Pacific, encouraging viewers to upgrade for this premium content. The remaining spots are ordered based on viewing history and popularity. Tapping the play button moves the user to the theatre where they can watch previews or full episodes streaming from Fancast. Tapping an extra presents the user with show details as well as interactive content that may be included as part of co-marketing efforts. Co-Marketing with Dynamic Content The success of Comcasts services are tied to the success of the networks and shows it purveys, making co-marketing efforts essential. In this concept FOX is co-marketing its popular show Glee. A customized panorama is updated with the latest gleeks tweets, streaming HD episodes, and extras featuring photos and video of the cast. If WP7 apps can be dynamically extended with web hosted .xap files, including sandboxed partner experiences would enable interactive features such as the Gleek Peek, in which a viewer can select a character from a panorama to view the actors profile. This dynamic inline experience has a tailored appeal to aspiring creatives and is technically possible with Windows Phone 7.   Summary The conceptual Comcast mobile app for Windows Phone 7 highlights just a few of the incredible experiences and business opportunities that can be unlocked with this latest mobile solution. It is critical that organizations recognize and take full advantage of these new capabilities. Simply porting existing mobile applications does not leverage these powerful tools; re-examining existing applications and upgrading them to Windows Phone 7 will prove essential to the continued growth and success of your brand.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Consolidation in a Database Cloud

  - by B R Clouse

  Consolidation of multiple databases onto a shared infrastructure is the next step after Standardization.  The potential consolidation density is a function of the extent to which the infrastructure is shared.  The three models provide increasing degrees of sharing: Server: each database is deployed in a dedicated VM. Hardware is shared, but most of the software infrastructure is not. Standardization is often applied incompletely since operating environments can be moved as-is onto the shared platform. The potential for VM sprawl is an additional downside. Database: multiple database instances are deployed on a shared software / hardware infrastructure. This model is very efficient and easily implemented with the features in the Oracle Database and supporting products. Many customers have moved to this model and achieved significant, measurable benefits. Schema: multiple schemas are deployed within a single database instance. The most efficient model, it places constraints on the environment. Usually this model will be implemented only by customers deploying their own applications.  (Note that a single deployment can combine Database and Schema consolidations.) Customer value: lower costs, better system utilization In this phase of the maturity model, under-utilized hardware can be used to host more workloads, or retired and those workloads migrated to consolidation platforms. Customers benefit from higher utilization of the hardware resources, resulting in reduced data center floor space, and lower power and cooling costs. And, the OpEx savings from Standardization are multiplied, since there are fewer physical components (both hardware and software) to manage. Customer value: higher productivity The OpEx benefits from Standardization are compounded since not only are there fewer types of things to manage, now there are fewer entities to manage. In this phase, customers discover that their IT staff has time to move away from "day-to-day" tasks and start investing in higher value activities. Database users benefit from consolidating onto shared infrastructures by relieving themselves of the requirement to maintain their own dedicated servers. Also, if the shared infrastructure offers capabilities such as High Availability / Disaster Recovery, which are often beyond the budget and skillset of a standalone database environment, then moving to the consolidation platform can provide access to those capabilities, resulting in less downtime. Capabilities / Characteristics In this phase, customers will typically deploy fixed-size clusters and consolidate on a cluster until that cluster is deemed "full," at which point a new cluster is built. Customers will define one or a few cluster architectures that are used wherever possible; occasionally there may be deployments which must be handled as exceptions. The "full" policy may be based on number of databases deployed on the cluster, or observed peak workload, etc. IT will own the provisioning of new databases on a cluster, making the decision of when and where to place new workloads. Resources may be managed dynamically, e.g., as a priority workload increases, it may be given more CPU and memory to handle the spike. Users will be charged at a fixed, relatively coarse level; or in some cases, no charging will be applied. Activities / Tasks Oracle offers several tools to plan a successful consolidation. Real Application Testing (RAT) has a feature to help plan and validate database consolidations. Enterprise Manager 12c's Cloud Management Pack for Database includes a planning module. Looking ahead, customers should start planning for the Services phase by defining the Service Catalog that will be made available for database services.

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• Shrinking a Linux OEL 6 virtual Box image (vdi) hosted on Windows 7

  - by AndyBaker

  v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Recently for a customer demonstration there was a requirement to build a virtual box image with Oracle Enterprise Manager Cloud Control 12c. This meant installing OEL Linux 6 as well as creating an 11gr2 database and Oracle Enterprise Manager Cloud Control 12c on a single virtual box. Storage was sized at 300Gb using dynamically allocated storage for the virtual box and about 10Gb was used for Linux and the initial build. After copying over all the binaries and performing all the installations the virtual box became in the region of 80Gb used size on the host operating system, however internally it only really needed around 20Gb. This meant 60Gb had been used when copying over all the binaries and although now free was not returned to the host operating system due to the growth of the virtual box storage '.vdi' file.  Once the ‘vdi’ storage had grown it is not shrunk automatically afterwards. Space is always tight on the laptop so it was desirable to shrink the virtual box back to a minimal size and here is the process that was followed. Install 'zerofree' Linux package into the OEL6 virtual box The RPM was downloaded and installed from a site similar to below; http://rpm.pbone.net/index.php3/stat/4/idpl/12548724/com/zerofree-1.0.1-5.el5.i386.rpm.html A simple internet search for ’zerofree Linux rpm’ was easy to perform and find the required rpm. Execute 'zerofree' package on the desired Linux file system To execute this package the desired file system needs to be mounted read only. The following steps outline this process. As root: # umount /u01 As root:# mount –o ro –t ext4 /u01 NOTE: The –o is options and the –t is the file system type found in the /etc/fstab. Next run zerofree against the required storage, this is located by a simple ‘df –h’ command to see the device associated with the mount. As root:# zerofree –v /dev/sda11   NOTE: This takes a while to run but the ‘-v’ option gives feedback on the process. What does Zerofree do? Zerofree’s purpose is to go through the file system and zero out any unused sectors on the volume so that the later stages can shrink the virtual box storage obtaining the free space back. When zerofree has completed the virtual box can be shutdown as the last stage is performed on the physical host where the virtual box vdi files are located. Compact the virtual box ‘.vdi’ files The final stage is to get virtual box to shrink back the storage that has been correctly flagged as free space after executing zerofree. On the physical host in this case a windows 7 laptop a DOS window was opened. At the prompt the first step is to put the virtual box binaries onto the PATH. C:\ >echo %PATH%   The above shows the current value of the PATH environment variable. C:\ >set PATH=%PATH%;c:\program files\Oracle\Virtual Box;   The above adds onto the existing path the virtual box binary location. C:\>cd c:\Users\xxxx\OEL6.1   The above changes directory to where the VDI files are located for the required virtual box machine. C:\Users\xxxxx\OEL6.1>VBoxManage.exe modifyhd zzzzzz.vdi compact  NOTE: The zzzzzz.vdi is the name of the required vdi file to shrink. Finally the above command is executed to perform the compact operation on the ‘.vdi’ file(s). This also takes a long time to complete but shrinks the VDI file back to a minimum size. In the case of the demonstration virtual box OEM12c this reduced the virtual box to 20Gb from 80Gb which was a great outcome to achieve.

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• Modernizr Rocks HTML5

  - by Laila

  HTML5 is a moving target.  At the moment, we don't know what will be in future versions.  In most circumstances, this really matters to the developer. When you're using Adobe Air, you can be reasonably sure what works, what is there, and what isn't, since you have a version of the browser built-in. With Metro, you can assume that you're going to be using at least IE 10.   If, however,  you are using HTML5 in a web application, then you are going to rely heavily on Feature Detection.  Feature-Detection is a collection of techniques that tell you, via JavaScript, whether the current browser has this feature natively implemented or not Feature Detection isn't just there for the esoteric stuff such as  Geo-location,  progress bars,  <canvas> support,  the new <input> types, Audio, Video, web workers or storage, but is required even for semantic markup, since old browsers make a pigs ear out of rendering this.  Feature detection can't rely just on reading the browser version and inferring from that what works. Instead, you must use JavaScript to check that an HTML5 feature is there before using it.  The problem with relying on the user-agent is that it takes a lot of historical data  to work out what version does what, and, anyway, the user-agent can be, and sometimes is, spoofed. The open-source library Modernizr  is just about the most essential  JavaScript library for anyone using HTML5, because it provides APIs to test for most of the CSS3 and HTML5 features before you use them, and is intelligent enough to alter semantic markup into 'legacy' 'markup  using shims  on page-load  for old browsers. It also allows you to check what video Codecs are installed for playing video. It also provides media queries  and conditional resource-loading (formerly YepNope.js.).  Generally, Modernizr gives you the choice of what you do about browsers that don't support the feature that you want. Often, the best choice is graceful degradation, but the resource-loading feature allows you to dynamically load JavaScript Shims to replace the standard API for missing or defective HTML5 functionality, called 'PolyFills'.  As the Modernizr site says 'Yes, not only can you use HTML5 today, but you can use it in the past, too!' The evolutionary progress of HTML5  requires a more defensive style of JavaScript programming where the programmer adopts a mindset of fearing the worst ( IE 6)  rather than assuming the best, whilst exploiting as many of the new HTML features as possible for the requirements of the site or HTML application.  Why would anyone want the distraction of developing their own techniques to do this when  Modernizr exists to do this for you? Laila

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• Faster Memory Allocation Using vmtasks

  - by Steve Sistare

  You may have noticed a new system process called "vmtasks" on Solaris 11 systems: % pgrep vmtasks 8 % prstat -p 8 PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP 8 root 0K 0K sleep 99 -20 9:10:59 0.0% vmtasks/32 What is vmtasks, and why should you care? In a nutshell, vmtasks accelerates creation, locking, and destruction of pages in shared memory segments. This is particularly helpful for locked memory, as creating a page of physical memory is much more expensive than creating a page of virtual memory. For example, an ISM segment (shmflag & SHM_SHARE_MMU) is locked in memory on the first shmat() call, and a DISM segment (shmflg & SHM_PAGEABLE) is locked using mlock() or memcntl(). Segment operations such as creation and locking are typically single threaded, performed by the thread making the system call. In many applications, the size of a shared memory segment is a large fraction of total physical memory, and the single-threaded initialization is a scalability bottleneck which increases application startup time. To break the bottleneck, we apply parallel processing, harnessing the power of the additional CPUs that are always present on modern platforms. For sufficiently large segments, as many of 16 threads of vmtasks are employed to assist an application thread during creation, locking, and destruction operations. The segment is implicitly divided at page boundaries, and each thread is given a chunk of pages to process. The per-page processing time can vary, so for dynamic load balancing, the number of chunks is greater than the number of threads, and threads grab chunks dynamically as they finish their work. Because the threads modify a single application address space in compressed time interval, contention on locks protecting VM data structures locks was a problem, and we had to re-scale a number of VM locks to get good parallel efficiency. The vmtasks process has 1 thread per CPU and may accelerate multiple segment operations simultaneously, but each operation gets at most 16 helper threads to avoid monopolizing CPU resources. We may reconsider this limit in the future. Acceleration using vmtasks is enabled out of the box, with no tuning required, and works for all Solaris platform architectures (SPARC sun4u, SPARC sun4v, x86). The following tables show the time to create + lock + destroy a large segment, normalized as milliseconds per gigabyte, before and after the introduction of vmtasks: ISM system ncpu before after speedup ------ ---- ------ ----- ------- x4600 32 1386 245 6X X7560 64 1016 153 7X M9000 512 1196 206 6X T5240 128 2506 234 11X T4-2 128 1197 107 11x DISM system ncpu before after speedup ------ ---- ------ ----- ------- x4600 32 1582 265 6X X7560 64 1116 158 7X M9000 512 1165 152 8X T5240 128 2796 198 14X (I am missing the data for T4 DISM, for no good reason; it works fine). The following table separates the creation and destruction times: ISM, T4-2 before after ------ ----- create 702 64 destroy 495 43 To put this in perspective, consider creating a 512 GB ISM segment on T4-2. Creating the segment would take 6 minutes with the old code, and only 33 seconds with the new. If this is your Oracle SGA, you save over 5 minutes when starting the database, and you also save when shutting it down prior to a restart. Those minutes go directly to your bottom line for service availability.

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• Project Time Tracker

  - by Geertjan

  Based on yesterday's blog entry, let's do something semi useful and display, in the project popup, which is available when you right-click a project in the Projects window, the time since the last change was made anywhere in the project, i.e., we can listen recursively to any changes done within a project and then update the popup with the newly acquired information, dynamically: import java.awt.event.ActionEvent; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.ArrayList; import java.util.Collection; import java.util.List; import javax.swing.AbstractAction; import org.netbeans.api.project.Project; import org.netbeans.api.project.ProjectUtils; import org.openide.awt.ActionID; import org.openide.awt.ActionReference; import org.openide.awt.ActionRegistration; import org.openide.awt.StatusDisplayer; import org.openide.filesystems.FileAttributeEvent; import org.openide.filesystems.FileChangeListener; import org.openide.filesystems.FileEvent; import org.openide.filesystems.FileRenameEvent; import org.openide.util.Lookup; import org.openide.util.LookupEvent; import org.openide.util.LookupListener; import org.openide.util.Utilities; import org.openide.util.WeakListeners; @ActionID( category = "Demo", id = "org.ptt.TrackProjectSelectionAction") @ActionRegistration( lazy = false, displayName = "NOT-USED") @ActionReference( path = "Projects/Actions", position = 0) public final class TrackProjectSelectionAction extends AbstractAction implements LookupListener, FileChangeListener { private Lookup.Result<Project> projects; private Project context; private Long startTime; private Long changedTime; private DateFormat formatter; private List<Project> timedProjects; public TrackProjectSelectionAction() { putValue("popupText", "Timer"); formatter = new SimpleDateFormat("HH:mm:ss"); timedProjects = new ArrayList<Project>(); projects = Utilities.actionsGlobalContext().lookupResult(Project.class); projects.addLookupListener( WeakListeners.create(LookupListener.class, this, projects)); resultChanged(new LookupEvent(projects)); } @Override public void resultChanged(LookupEvent le) { Collection<? extends Project> allProjects = projects.allInstances(); if (allProjects.size() == 1) { Project currentProject = allProjects.iterator().next(); if (!timedProjects.contains(currentProject)) { String currentProjectName = ProjectUtils.getInformation(currentProject).getDisplayName(); putValue("popupText", "Start Timer for Project: " + currentProjectName); StatusDisplayer.getDefault().setStatusText( "Current Project: " + currentProjectName); timedProjects.add(currentProject); context = currentProject; } } } @Override public void actionPerformed(ActionEvent e) { refresh(); } protected void refresh() { startTime = System.currentTimeMillis(); String formattedStartTime = formatter.format(startTime); putValue("popupText", "Timer started: " + formattedStartTime + " (" + ProjectUtils.getInformation(context).getDisplayName() + ")"); } @Override public void fileChanged(FileEvent fe) { changedTime = System.currentTimeMillis(); formatter = new SimpleDateFormat("mm:ss"); String formattedLapse = formatter.format(changedTime - startTime); putValue("popupText", "Time since last change: " + formattedLapse + " (" + ProjectUtils.getInformation(context).getDisplayName() + ")"); startTime = changedTime; } @Override public void fileFolderCreated(FileEvent fe) {} @Override public void fileDataCreated(FileEvent fe) {} @Override public void fileDeleted(FileEvent fe) {} @Override public void fileRenamed(FileRenameEvent fre) {} @Override public void fileAttributeChanged(FileAttributeEvent fae) {} } Some more work needs to be done to complete the above, i.e., for each project you somehow need to maintain the start time and last change and redisplay that whenever the user right-clicks the project.

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• Why I lose certain values from array?

  - by blankon91

  I've the code to input the values dynamically, when I use it to add the values for the first time, it's fine, but when I want to edit it, the old values didn't inserted on sql query but the new values inserted Here is the example: http://i.stack.imgur.com/dwugS.jpg here is the code: ============the function================= sub ShowItemfgEdit(query,selItemName,defValue,num,cdisable) response.write "<select " & cdisable & " num=""" & num & """ id=""itemCombo"" name=""" & selItemName & """ class=""label"" onchange=""varUsage.ChangeSatuanDt(this)"">" if NOT query.BOF then query.moveFirst WHILE NOT query.EOF tulis = "" if trim(defValue) = trim(query("ckdbarang")) then tulis = "selected" end if response.write "<option value=""" & trim(query("ckdbarang")) & """" & tulis & ">" & trim(query("ckdbarang")) & " - " & trim(query("vnamabarang")) query.moveNext WEND end if response.write "</select>" end sub ============calling the function================ <td class="rb" align="left"><% call ShowItemfgEdit(qGetItemfgGrp,"fitem",qGetUsageDt("ckdfg"),countLine,readonlyfg) %></td> ==============post the value====================== <input type="hidden" name="fitem" value=""> ================get the value=================== for i = 1 to request.form("hdnOrderNum") if request.form("selOrdItem_" & i) <> "" then 'bla...blaa...blaa... ckdfg = trim(request.form("fitem_" & i)) '<==here is the problem objCommand.commandText = "INSERT INTO IcTrPakaiDt " &_ "(id, id_h, ckdunitkey, cnopakai, dtglpakai, ckdbarang, ckdgudang, nqty1, nqty2, csatuan1, csatuan2, nqtypakai, csatuanpakai, vketerangan, cJnsPakai, ckdprodkey, ckdfg, ncountstart, ncountstop, ncounttotal) " &_ " VALUES " &_ " (" & idDt & ",'" & idHd & "','" & selLoc & "','" & nopakai & "','" & cDate(request.form("hdnUsageDate")) & "','" & trim(ckdbarang) & "','" & trim(ckdgudang) & "'," & nqty1 & "," & nqty2 & ",'" & trim(csatuan1) & "','" & trim(csatuan2) & "'," & nqtypakai & ",'" & csatuanpakai & "','" & trim(keteranganItem) & "','" & trim(cjnspakai) & "','" & ckdprodkey & "','" &ckdfg& "'," & cnt1 & "," & cnt2 & "," & totalcnt & ")" set qInsertPakaiDt = objCommand.Execute end if next problem: old value of ckdfg didn't inserted to query, but the new value inserted. How to fix this bug?

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• Google.com and clients1.google.com/generate_204

  - by David Murdoch

  I was looking into google.com's Net activity in firebug just because I was curious and noticed a request was returning "204 No Content." It turns out that a 204 No Content "is primarily intended to allow input for actions to take place without causing a change to the user agent's active document view, although any new or updated metainformation SHOULD be applied to the document currently in the user agent's active view." Whatever. I've looked into the JS source code and saw that "generate_204" is requested like this: (new Image).src="http://clients1.google.com/generate_204" No variable declaration/assignment at all. My first idea is that it was being used to track if Javascript is enabled. But the "(new Image).src='...'" call is called from a dynamically loaded external JS file anyway, so that would be pointless. Anyone have any ideas as to what the point could be? UPDATE "/generate_204" appears to be available on many google services/servers (e.g., maps.google.com/generate_204, maps.gstatic.com/generate_204, etc...). You can take advantage of this by pre-fetching the generate_204 pages for each google-owned service your web app may use. Like This: window.onload = function(){ var two_o_fours = [ // google maps domain ... "http://maps.google.com/generate_204", // google maps images domains ... "http://mt0.google.com/generate_204", "http://mt1.google.com/generate_204", "http://mt2.google.com/generate_204", "http://mt3.google.com/generate_204", // you can add your own 204 page for your subdomains too! "http://sub.domain.com/generate_204" ]; for(var i = 0, l = two_o_fours.length; i < l; ++i){ (new Image).src = two_o_fours[i]; } };

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• jqGrid dynamic select option - beforeEditCell not firing

  - by mango

  I'm creating a jqgrid with one drop down column. I need the options of the drop down columns to change dynamically so I thought I can catch the beforeCellEdit event. however it does not seem to be firing. any idea on what i am doing wrong? there is no error, and i did check that i have included the jqgrid edit js files. var lastsel2; jQuery(document).ready(function(){ jQuery("#projectList").jqGrid({ datatype: 'json', url:'projectDrv.jsp', mtype: 'GET', height: 250, colNames:['Node','Proposal #', 'Status', 'Vendor', 'Actions'], colModel :[ {name:'node', index:'node', width:100, editable:false, sortable:false}, {name:'proposal', index:'proposal', width:100, editable:false, resizable:true }, {name:'status', index:'status', width:100, resizable:true, sortable:false, editable:false }, {name:'vendor', index:'vendor', width:100, resizable:true, editable:false, sortable: false }, {name:'actions', index:'actions', width:100, resizable:true, sortable:false, editable: true, edittype:"select" } ], pager: '#pager', rowNum: 10, sortname: 'proposal', sortorder: 'desc', viewrecords: true, onSelectRow: function(id){ if (id && id!==lastsel2){ jQuery('#projectList').jqGrid('restoreRow',lastsel2); jQuery('#projectList').jqGrid('editRow',id,true); lastsel2 = id; } }, beforeEditCell: function(rowid, cellname, value, irow, icol) { alert("before edit here " + rowid); // set editoptions here } });

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• jqGrid dynamic select option

  - by Jo

  I'm creating a jqgrid with drop down columns and I'm using cell editing. I need the options of the drop down columns to change dynamically and I've tried implementing this by setting the column to be: { name: "AccountLookup", index: "AccountLookup", width: 90, editable: true, resizable: true, edittype: "select", formatter: "select" }, and then in the beforeCellEdit event I have: beforeEditCell: function(id, name, val, iRow, iCol) { if(name=='AccountLookup') { var listdata = GetLookupValues(id, name); if (listdata == null) listdata = "1:1"; jQuery("#grid").setColProp(name, { editoptions: { value: listdata.toString()} }) } }, GetLookupValues just returns a string in the format "1:One;2:Two" etc. That works fine however the options are populated one click behind - ie i click on AccountID in row 1, and the dropdown is empty, however when I then click on AccountID in row 3 the options I set in the row 1 click are shown in the row 3 click. And so on. So always one click behind. Is there another way of achieving what I need? Bacially the dropdown options displayed are always changing and I need to load them as user enters the cell for editing. Perhaps I can somehow get at the select control in the beforeEditCell event and manually enter its values instead of using the setColProp call? If so could I get an example of doing that please? Another thing - if the dropdown is empty and a user doesn't cancel the cell edit, the grid script throws an error. I'm using clientarray editing if that makes a difference. Greatly appreciate any help. Regards, Jo

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• What is Causing This Memory Leak in Delphi?

  - by lkessler

  I just can't figure out this memory leak that EurekaLog is reporting for my program. I'm using Delphi 2009. Here it is: Memory Leak: Type=Data; Total size=26; Count=1; The stack is: System.pas _UStrSetLength 17477 System.pas _UStrCat 17572 Process.pas InputGedcomFile 1145 That is all there is in the stack. EurekaLog is pointing me to the location where the memory that was not released was first allocated. According to it, the line in my program is line 1145 of InputGedcomFile. That line is: CurStruct0Key := 'HEAD' + Level0Key; where CurStruct0Key and Level0Key are simply defined in the procedure as local variables that should be dynamically handled by the Delphi memory manager when entering and leaving the procedure: var CurStruct0Key, Level0Key: string; So now I look at the _UStrCat procedure in the System Unit. Line 17572 is: CALL _UStrSetLength // Set length of Dest and I go to the _UStrSetLength procedure in the System Unit, and the relevant lines are: @@isUnicode: CMP [EAX-skew].StrRec.refCnt,1 // !!! MT safety JNE @@copyString // not unique, so copy SUB EAX,rOff // Offset EAX "S" to start of memory block ADD EDX,EDX // Double length to get size JO @@overflow ADD EDX,rOff+2 // Add string rec size JO @@overflow PUSH EAX // Put S on stack MOV EAX,ESP // to pass by reference CALL _ReallocMem POP EAX ADD EAX,rOff // Readjust MOV [EBX],EAX // Store MOV [EAX-skew].StrRec.length,ESI MOV WORD PTR [EAX+ESI*2],0 // Null terminate TEST EDI,EDI // Was a temp created? JZ @@exit PUSH EDI MOV EAX,ESP CALL _LStrClr POP EDI JMP @@exit where line 17477 is the "CALL _ReallocMem" line. So then what is the memory leak? Surely a simple concatenate of a string constant to a local string variable should not be causing a memory leak. Why is EurekaLog pointing me to the ReallocMem line in a _UStrSetLength routine that is part of Delphi? This is Delphi 2009 and I am using the new unicode strings. Any help or explanation here will be much appreciated.

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• managing images in an iphone/ipad universal app

  - by taber

  Hi, I'm just curious as to what methods people are using to dynamically use larger or smaller images in their universal iPhone/iPad apps. I created a large test image and I tried scaling down (using cocos2d) by 0.46875. After viewing that in the iPhone 4.0 simulator I found the results were pretty crappy... rough pixel edges, etc. Plus, loading huge image files for iPhone users when they don't need them is pretty lame. So I guess what I will probably have to do is save out two versions of every sprite... large (for the iPad side) and small (for iPhone/iPod Touch) then detect the user's device and spit out the proper sprite like so: NSString *deviceType = [UIDevice currentDevice].model; CCSprite *test; if([deviceType isEqualToString:@"iPad"]) { test = [CCSprite spriteWithFile:@"testBigHuge.png"]; } else { test = [CCSprite spriteWithFile:@"testRegularMcTiny.png"]; } [self addChild: test]; How are you guys doing this? I'd rather avoid sprinkling all of my code with if statements like this. I want to also avoid using .xib files since it's an OpenGL-based app. Thanks!

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• DynamicResource and Dynamic Items in ContextMenu on XamDataGrid

  - by miguel

  I would like to dynamically create a set of context menu options based upon some properties. Currently, I am creating a context menu as a DynamicResource with the visibility of the menu options bound to the properties, however, it seems that the DynamicResource is created only once, at runtime. Is this true? What I would like to do is have the menu generated each time, which will take into account the property changes on the data object. Please see the following XAML snippet: <Border DockPanel.Dock="Right" Margin="4,4,4,4" BorderBrush="Gray" BorderThickness="1" CornerRadius="3" > <igDP:XamDataGrid Height="Auto" Width="Auto" Style="{DynamicResource DefaultInfragisticsGridStyle}" Name="axeDataGrid" ActiveRecord="{Binding Path=SelectedItem, Mode=TwoWay}" DataSource="{Binding Path=Axes}" ContextMenuOpening="ContextMenuOpeningHandler"> <igDP:XamDataGrid.Resources> <Style TargetType="{x:Type igDP:DataRecordPresenter}" BasedOn="{x:Static Themes:DataPresenterAero.DataRecordPresenter}"/> <ContextMenu x:Key="RecordContextMenu"> <ContextMenu.Resources> <BooleanToVisibilityConverter x:Key="booleanToVisibilityConverter"/> </ContextMenu.Resources> <MenuItem Header="Cancel Axe" Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type igDP:XamDataGrid}}, Path=DataContext.CancelAxe}" Visibility="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type igDP:XamDataGrid}}, Path=DataContext.IsCancelAxeAllowed, Converter={StaticResource booleanToVisibilityConverter}, Mode=OneWay}"/> <MenuItem Header="Create RFQ" Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type igDP:XamDataGrid}}, Path=DataContext.CreateRFQ}" Visibility="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type igDP:XamDataGrid}}, Path=DataContext.IsCreateRfqAllowed, Converter={StaticResource booleanToVisibilityConverter}, Mode=OneWay}"/> </ContextMenu> <Style TargetType="{x:Type igDP:DataRecordCellArea}"> <Setter Property="ContextMenu" Value="{DynamicResource RecordContextMenu}" /> </Style>

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• Css code for the table

  - by Hulk

  Can some one please tell me how to make this table look better <table> <tr><th>Name</th><th>Address</th><th>occupation</th></tr> <tr><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td></tr> <tr><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td></tr> <tr><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td><td><textarea rows=10 cols=15></td></tr> </table> This table is dynamically generated and meaning there could me more rows with td containing textarea. Can any one please sugesst a a css code to beautify this table or may be a link Thanks..

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• dynamic GridView in CreateChildControls throws a "RegisterRequiresControlState can only be called be

  - by tbischel

  I am trying to add a GridView dynamically to a SharePoint Web Part. Right now, the first time I load the gridview, everything works fine. My gridview has an edit column enabled... so when I click that, it throws an exception when I try and add the gridview control on the postback. The exception: "RegisterRequiresControlState can only be called before and during PreRender" I've tried adding my controls in the CreateChildControls function, the OnInit, OnPageLoad, and OnPreRender... all exhibit the same problem. Does anyone know what might cause this kind of error? Edit: So to test this problem, I created a local GridView in the webpart, recreating all the properties in the one that failed. It actually worked this time through... the only difference that I could identify was that I had made the gridview a static variable in another class, where as here I initiated the gridview as a local variable. I even used the same initializing function for both the original and modified version, same difference. So why would creating a GridView locally affect the ability to add it to a web part?

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• WPF - Binding an ObservableCollection Dependency Property within a UserControl

  - by John

  I have a control class DragGrid : Grid { ... } which inherits from the original grid and enables dragging and resizing its child elements. I need to bind a custom DP named WorkItemsProperty to an observable collection of type WorkItem (implements INotifyPropertyChanged). Each element in the grid is bound to a collection item. Whenever the user adds a new item dynamically at runtime (the items cannot be declared in XAML!), or deletes an item from that collection, the WorkItems DP on the DragGrid should be updated, and the children in the grid (where each child represents a WorkItem collection item). My question is how does the DP notify the control about which child element in the grid must be removed, changed ('change' means user dragged an element, or resized it with the mouse) or added, and how would I identify which one of the existing children is the one that needs to be deleted or changed. I understand that this is where the DependencyPropertyChangedCallback comes in. But that only gets called when the DP property is set anew, not when something inside the collection changes (like add, remove item). So in the end, does the DragGrid control somehow need to subscribe to the CollectionChanged event? At what point would I hook up the event handler for that?

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• CSS window height problem with dynamic loaded css

  - by Michael Mao

  Hi all: Please go here and use username "admin" and password "endlesscomic" (without wrapper quotes) to see the web app demo. Basically what I am trying to do is to incrementally integrate my work to this web app, say, every nightly, for the client to check the progress. Also, he would like to see, at the very beginning, a mockup about the page layout. I am trying to use the 960 grid system to achieve this. So far, so good. Except one issue that when the "mockup.css" is loaded dynamically by jQuery, it "extends" the window to the bottom, something I do not wanna have... As an inexperienced web developer, I don't know which part is wrong. Below is my js: /* master.js */ $(document).ready(function() { $('#addDebugCss').click(function() { alertMessage('adding debug css...'); addCssToHead('./css/debug.css'); $('.grid-insider').css('opacity','0.5');//reset mockup background transparcy }); $('#addMockupCss').click(function() { alertMessage('adding mockup css...'); addCssToHead('./css/mockup.css'); $('.grid-insider').css('opacity','1');//set semi-background transparcy for mockup }); $('#resetCss').click(function() { alertMessage('rolling back to normal'); rollbackCss(new Array("./css/mockup.css", "./css/debug.css")); }); }); function alertMessage(msg) //TODO find a better modal prompt { alert(msg); } function addCssToHead(path_to_css) { $('<link rel="stylesheet" type="text/css" href="' + path_to_css + '" />').appendTo("head"); } function rollbackCss(set) { for(var i in set) { $('link[href="'+ set[i]+ '"]').remove(); } } Something should be added to the exteral mockup.css? Or something to change in my master.js? Thanks for any hints/suggestions in advance.

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• Building Dynamic Classes in Objective C

  - by kjell_

  I'm a somewhat competent ruby programmer. Yesterday I decided to finally try my hand with Apple's Cocoa frameworks. Help me see things the ObjC way? I'm trying to get my head around objc_allocateClassPair and objc_registerClassPair. My goal is to dynamically generate a few classes and then be able to use them as I would any other class. Does this work in Obj C? Having allocated and registered class A, I get a compile error when calling [[A alloc] init]; (it says 'A' Undeclared). I can only instantiate A using runtime's objc_getClass method. Is there any way to tell the compiler about A and pass it messages like I would NSString? A compiler flag or something? I have 10 or so other classes (B, C, …), all with the same superclass. I want to message them directly in code ([A classMethod], [B classMethod], …) without needing objc_getClass. Am I trying to be too dynamic here or just botching my implementation? It looks something like this… NSString *name = @"test"; Class newClass = objc_allocateClassPair([NSString class], [name UTF8String], 0); objc_registerClassPair(newClass); id a = [[objc_getClass("A") alloc] init]; NSLog(@"new class: %@ superclass: %@", a, [a superclass]); //[[A alloc] init]; blows up.

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• Using jquery validate with multiple fields of the same name

  - by Matt H

  I am trying to get jquery validate to work on multiple fields. Reason being I have dynamically generated fields added and they are simply a list of numbers. So I thought I'd put together a basic example and followed the concept from the accepted answer in the following link: http://stackoverflow.com/questions/931687/using-jquery-validate-plugin-to-validate-multiple-form-fields-with-identical-name However, it's not doing anything useful. Why is it not working? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <script src="http://code.jquery.com/jquery-latest.js"></script> <script type="text/javascript" src="http://dev.jquery.com/view/trunk/plugins/validate/lib/jquery.delegate.js"></script> <script type="text/javascript" src="http://dev.jquery.com/view/trunk/plugins/validate/jquery.validate.js"></script> <script> $("#submit").click(function(){ $("field").each(function(){ $(this).rules("add", { required: true, email: true, messages: { required: "Specify a valid email" } }); }) }); $(document).ready(function(){ $("#myform").validate(); }); </script> </head> <body> <form id="myform"> <label for="field">Required, email: </label> <input class="left" id="field" name="field" /> <input class="left" id="field" name="field" /> <input class="left" id="field" name="field" /> <input class="left" id="field" name="field" /> <br/> <input type="submit" value="Validate!" id="submit" name="submit" /> </form> </body> </html>

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• VS2010 Ultimate - Unable to launch ASP.NET Development Server

  - by sohum

  I've worked with ASP.NET once before and had a project where it was potentially useful, so I started creating an ASP.NET website as part of a solution that contained several C# class libraries. I'm using Visual Studio 2010 Ultimate Edition and Windows 7 Professional x64. The issue is that when I try to debug my website project, I get the following error message: Unable to launch the ASP.NET Development Server There's no other information (it seems a popular variant is the "port in use" error). Interestingly, I can run single pages on the application by right-clicking on the ASPX and selecting "View in Browser". This does not allow me to debug into my breakpoints, though. I have no clue what the problem could be. I'm running VS2010 in Administrator mode. One of the questions that popped up here suggested I uncomment the "127.0.0.1 localhost" line from my HOSTS file, which I did, and restarted VS with no luck. I also tried both setting a static port for the web server to run on as well as let it dynamically generate one. Both do not help the situation. Any help? Thanks.

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• CSS layout that fills available space

  - by Jared I

  I'm trying to do a seemingly simple webpage layout, but I'm hitting a wall. I'd like to do everything purely with CSS (no tables to much things up, and no javascript dynamically resizing things) I'd like to have: A heading with a fixed height A footer with a fixed height Left sidebar with a fixed width Right sidebar with a fixed width The whole layout always fills the entire viewport (i.e. if the user resizes the window, the layout grows to the new size) Put another way: |< Total width is 100% of viewport >| +--------------------------------------------------------------+ --- | Header with a fixed height | ^ |--------+-------------------------------------------+---------+ | | | | | | | | | Left | | Right | Total | with | Center grows in height/width | with | height | fixed | and has scrollbars if necessary | fixed | is | width | | width | 100% | | | | of | | | | viewport | | | | |--------+-------------------------------------------+---------| | Footer with a fixed height | v +--------------------------------------------------------------+ --- The parts that are giving me the most trouble are Having the sidebars and center have a height equal to the height of the viewport minus the heights of the header and footer Having the center have a width equal to the width of the viewport minus the widths of the two sidebars I have no problem requiring users to have a modern browser. I'm aware that similar questions to this have been asked before, such as Make a div fill remaining space (http://stackoverflow.com/questions/1717564) Three row tableless CSS layout with middle row that fills remaining space (http://stackoverflow.com/questions/1703455) Create 2 divs, one takes up remaining space (http://stackoverflow.com/questions/1717564) ... and the conclusion seems to be that there isn't a good solution. Those answers are somewhat old, so I'm hoping that someone knows the trick now.

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• Using SharePoint label to display document version in Word 2007 doesn't work when moved to another l

  - by ITManagerWhoCodes

  I am surfacing the Document Library version of a Word 2007 document by creating a Label ({version}) within the content type of the Document Library and adding it as a Quick-part Label in the Word 2007 document. This works great. The latest version always shows up when I open the Word document. I also added this Version quick-part field to the footer of the Word document and then added this document as a document template to my content type, "ContentTypeMain". Now, I can go to my Document Library and I can create a New instance of "ContentTypeMain" with the Version field automatically there. This works great as well. However, if I create another Document Library and add the same Content Type, "ContentTypeMain" to it, the value of the Version quick-part doesn't update or refresh. The only way is to add another copy of the Label quick-part. It seems like the Quick-Part Label that maps to the Document Library Version is unique to the Document Library. My application dynamically creates subsites using site definitions and list templates. Thus the document library in each of the subsites are all being created from the same List Template. I inspected the XML files under the hood of the Word Document and it does look like there is a GUID attached to the Quick-Part Version field.

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• Streaming to the Android MediaPlayer

  - by Rob Szumlakowski

  Hi. I'm trying to write a light-weight HTTP server in my app to feed dynamically generated MP3 data to the built-in Android MediaPlayer. I am not permitted to store my content on the SD card. My input data is essentially of an infinite length. I tell MediaPlayer that its data source should basically be something like "http://localhost/myfile.mp3". I've a simple server set up that waits for MediaPlayer to make this request. However, MediaPlayer isn't very cooperative. At first, it makes an HTTP GET and tries to grab the whole file. It times out if we try and simply dump data into the socket so we tried using the HTTP Range header to write data in chunks. MediaPlayer doesn't like this and doesn't keep requesting the subsequent chunks. Has anyone had any success streaming data directly into MediaPlayer? Do I need to implement an RTSP or Shoutcast server instead? Am I simply missing a critical HTTP header? What strategy should I use here? Rob Szumlakowski

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• Silverlight 3.0 Custom ListBox DataTemplate has a checkbox, checked event not firing

  - by Bhaskar

  The datatemplate for the ListBox is set dynamically by XamlReader.Load. I am subscribing to Checked event by getting the CheckBox object using VisualTreeHelper.GetChild. This event is not getting fired Code Snippet public void SetListBox() { lstBox.ItemTemplate = XamlReader.Load(@"<DataTemplate xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml' x:Name=""DropDownTemplate""><Grid x:Name='RootElement'><CheckBox x:Name='ChkList' Content='{Binding " + TextContent + "}' IsChecked='{Binding " + BindValue + ", Mode=TwoWay}'/></Grid></DataTemplate>") as DataTemplate; CheckBox chkList = (CheckBox)GetChildObject((DependencyObject)_lstBox.ItemTemplate.LoadContent(), "ChkList"); chkList.Checked += delegate { SetSelectedItemText(); }; } public CheckBox GetChildObject(DependencyObject obj, string name) { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++) { DependencyObject c = VisualTreeHelper.GetChild(obj, i); if (c.GetType().Equals(typeof(CheckBox)) && (String.IsNullOrEmpty(name) || ((FrameworkElement)c).Name == name)) { return (CheckBox)c; } DependencyObject gc = GetChildObject(c, name); if (gc != null) return (CheckBox)gc; } return null; } How to handle the checked event? Please help

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