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• Mobile (Client) to Amazon S3 (Server) - Architecture

  - by wasabii

  let's start off with the problem statement: My iOS application has a login form. When the user logs in, a call is made to my API and access granted or denied. If access was granted, I want the user to be able to upload pictures to his account and/or manage them. As storage I've picked Amazon S3, and I figured it'd be a good idea to have one bucket called "myappphotos" for instance, which contains lots of folders. The folder names are hashes of a user's email and a secret key. So, every user has his own, unique folder in my Amazon S3 bucket. Since I've just recently started working with AWS, here's my question: What are the best practices for setting up a system like this? I want the user to be able to upload pictures directly to Amazon S3, but of course I cannot hard-code the access key. So I need my API to somehow talk to Amazon and request an access token of sorts - only for the particular folder that belongs to the user I'm making the request for. Can anyone help me out and/or guide me to some sources where a similar problem was addressed? Don't think I'm the first one and the amazon documentation is so extensive that I don't really know where to start looking. Thanks a lot!

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• How would you manage development between many Staging branches?

  - by Trip

  We have a Staging Branch. then we came out with a Beta branch for users to move whenever they wanted to from old Production branch to the new features. Our plan seemed simple, we test on Staging, when items get QA'd, they get cherry-picked and deploy to Beta. Here's the problem! A bug will discreetly make its way on to Beta, and since Beta is a production environment, it needs fixes fast and accurate. But not all the QA's got done. Enter Git hell.. So I find a problem on Beta. No sweat, its already been fixed on Staging, but when I go to cherry-pick the item over, Beta barely has any of the other pre-requisites of code to implement this small change. Now Beta has a little here and a little there, and I can't imagine it as a code base being as stable as Staging. What's more, is I'm dealing with some insane Git conflicts, and having to monkey patch a bunch of things to make up for what Beta hasn't caught up with Staging. Can someone polite or non-polite terms, tell me what we're doing wrong here as far as assembling this project? Any awesome recommendations or workarounds or alternatives to the system we came up with?

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• determine an application's process name on linux (ubuntu)

  - by Jacob

  This is the situation: Working on (the next version of) a Unity quicklist editor, I would like to add a reliable way of "restarting" launcher icons. To do so, I need to remove the icon (editing gsettings) and replace it on the same position. So far no problem. However, if the application in question is running, user will possibly lose data, as the application will quit when it's icon is removed from the launcher. What I need is a reliable way to find an application's process name, to let the editor check in the list of running processes if the application is running, and send a warning message to the user that the icon can not be restarted if the application is running. What i did so far is make the editor look into the desktop file, to read the command, also read the command, stripped from the directory section, and furthermore look into possible remote scripts the desktop file command might refer to, looking for strings starting with "./" Although te method seems to work well with all applications I tested it on, I have the feeling there must be an easier way to cover the problem in an "all in one" way... Is there? also suggestions to catch more exceptional situations are welcome!

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• Delete Ubuntu and Grub from PC (and BIOS unaccessible)

  - by Temitope

  I've really done a mess while upgrading 12.04 to 12.10, or my PC did, or ubuntu did, I can't really tell. The situation now is I have a dual booting machine, Windows 7 and ubuntu 12.10 -When turning on the PC, I can't access boot options, I've tried every thing, esc, f1 f8, f10 (I have a Hp pavilion) but all I can see is a short-lasting screen with three lines reading something like "error:files not found" or "link not found". So the PC turns to the Grub loader screen. This is already a BIG problem. It means I can't change boot order, and I'm diperate, since it doensn't seem that repairing my operating systems will bring my BIOS back. -If I chose Ubuntu in grup, it loades but then frezes on the desktop, I may be having problem with unity3d, or compiz, which was reported to be crashing the first times I started ubuntu. Now, after turning off and on the pc several times, no crash is reported again. Ubuntu just load my background image and nothing else. Not the side menu, not the header, nothing. Althogh the system seems "functioning", when I press the power button on the PC, for example, the normal shutdown dialog window appears. -If I chose Windows, Grubs tells me that something is not found, and to press any key to continue; I do it and then Windows loads perfectly. What I now want to do is 1- use EasyBSD to change boot order and boot Windows partition first 2- delete the ubuntu partitions from within windows disk manager What I except happening is that My PC turns to, or near to factory booting settings: I press the power button and Windows loads without asking me nothing I have acess to all my hardisk from withing windows Is that what will really happen? Are there danger I'm not seeing? What I don't except happening is The BIOS access key return functioning How could I eventually solve this? I would like to reinstall Ubuntu, 32 bit version this time.

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• How complex/straightforward should my programming challenge response in an interview be? [closed]

  - by atraudes

  I've had a couple of interviews for programmer positions in the past couple of weeks, and just about all of them have presented me with programming challenges. Write a program with XX language that can solve XX puzzle or problem, etc. I've had no problem answering the questions. What I'm unsure about is what the depth and breadth my response should be. What would an ideal response look like? How much oomph and time should I spend on elements of the code that aren't crucial to it running (Comments, Javadoc, error handling, etc.)? What if I have 1 hour/6 hours/a whole weekend to spend on it? What are the most important aspects of my response to the interviewer? What's worked for you in the past or what worked on you as an interviewer? I'm definitely one of those folks that can go all out on a project and make it truly shine, but I don't want to give them the impression that I'm going to waste their time and money on stuff they may not want or care about. I have a sneaking feeling there is no "wrong" way to respond to the challenge; each response has a redeeming quality about it, and the goals of the interview are subjective. Regardless, I would love your thoughts and input on this.

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• Can't get my graphics driver (GMA 3150) to work

  - by bracus

  I've been searching like crazy trying to find a fix for this, it's the only thing that's not completely working on my setup. I see posts where people say it should be working but it just isn't. I have a Gateway LT2802u netbook and I installed 11.10 on this 2 days ago. Everything works except for accelerated graphics. At first I couldn't watch a simple flash video at all, but somehow I got it to work. Now the last problem I have is I can't watch HD videos, my screen resolution won't go higher than 1024x600, and my under my graphics driver it says "Unknown". After doing as much research as possible, I've come to the conclusion that it's the GMA 3150 graphics driver. There is a bunch of talk on it all over the interwebs but nothing lately. I've tried the fixes that some people have used but most when I try to get the package it's no longer there or available if that makes sense. I'm loving everything Ubuntu has to offer but it'll really bite if I can't use it any more because of this problem. Does anybody have any ideas? You'd really be helping a lot.

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• Trouble installing Ubuntu.

  - by CV13

  I have a blank 1TB hard drive that I have run ubuntu on before. I recently formatted it and am trying to reinstall Ubuntu 12.04 LTS on there. Using the Universal USB installer and the 64-bit iso file, I booted up my computer with only my 1TB hard drive connected. I go through the installation process normally, until I restart my computer at the end. Once restarted, I start to experience the problem deal with here. When I run it normally, it goes to a black screen with a blinking cursor. When I select the "Recovery Mode" option, a bunch of lines scroll across the screen, the last of which is "hostap_pci: Registered netdevice wifi0". It then stops there with a blinking cursor. When I follow the instructions on the page I linked to (replacing "quiet splash" with "nomodeset") and bunch of lines scroll through after I press Ctrl+x. The last line displayed is Adding 8386556k swap on /dev/sda5. Priority:-1 extents:1 across: 8386556k It then stops there with a blinking cursor. How do I fix this problem?

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• When should I decline to make a requested change?

  - by reuscam

  I work on the software side of a company that provides custom hardware with software running on top of it. Often times the hardware is not engineered well. In those cases, I am often asked first to troubleshoot the problem - of course the symptom is always "your software crashed" or something along those lines. Just recently we had another one of these incidents where power on a USB line is not reliable, and it causes a USB device to fail. This causes a usability problem in one of our applications. I have been asked by upper management to handle this better - continually monitor the USB device, and if it disappears, then reboot, or try to reset it. Doing either of these is not guaranteed to fix anything. Ultimately, the real fix is to correct the reliability of the device from the hardware side. I could improve performance, but not to 100%, and of course I would be using my already limited time to bloat code and add yet another device monitoring thread. So with all that said, how do I make a good decision about when to say that this needs to be a hardware fix, and only a hardware fix? Can I approach this quantitatively, and come up with some sort of definitive yes/no test? I'm sure its not that easy.

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• What is the most effective approach to learn an unfamiliar complex program? [closed]

  - by bdroc

  Possible Duplicate: How do you dive into large code bases? I have quite a bit of experience with different programming languages and writing small and functional programs for a variety of purposes. My coding skills aren't what I have a problem with. In fact, I've written a decent web application from scratch for my startup. However, I have trouble jumping into unfamiliar applications. What's the most effective way to approach learning a new program's structure and/or architecture so that I can start attacking the code effectively? Are there useful tools for their respective languages (Python and Java are my two primary languages)? Should I be starting with just looking at function names or documentation? How do you veterans approach this problem? I find this has to be with minimal help from coworkers or contributors who are already familiar with the application and have better things to do than help me. I'd love to practice this skill in an open source project so any suggestions for starting points (maybe mildly complex) would be great too!

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• I failed FizzBuzz, would you hire me? [closed]

  - by ja_programmer

  I'm a developer with a CS degree and have work experience doing development in a number of languages for almost 3 years. Today had an interview (2nd interview) with a panel of people. Overall it went quite well, I prepared for most of the questions and felt ready for anything. At the end of the interview, they gave me ONE programming question...a problem like FizzBuzz (without the print the number part). I believe I made too many mistakes and thus have "failed" it. Is all hope lost for me? Here is my code: void FizzBuzz() { for(int i = 0; i <= 100; i++) { bool isThree = i % 3; bool isFive = i % 5; if (isThree) { print "Fizz\n"; } else if(isFive) { print "Buzz\n"; } else { print "FizzBuzz\n"; } } } As you can see I messed up the bools which should have the syntax i % 3 == 0; If I'm remembering the question right I also put an else instead of an elseif with isThree && isFive. I was quite stressed, but that's no excuse for missing a simple problem. So the question is, if my work history and personality fit with the job and this is the only code you've seen, would you hire me?

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• Social Network ( Help) [on hold]

  - by brunocascio

  I am in a great "problem" so to speak , and I need opinions to decide. The problem is to create a social network without knowing the number of users who use it (but if thinking if they were sufficient ) . The question is which language and framework to use .... I do not mind having to learn new technologies and / or languages ??. I am among PHP ( Laravel - Symfony - other? ) Ruby ( Ruby on Rails 4? ) Javascript ( Ember , express, locomotive , other? ) Python ( Django ) Java ( Grails , Play, other?) I have experience in both PHP and frameworks. In Symfony developed part of it, but I got tired having to do a thousand configurations for all . I know very little about Ruby , but I saw very easy . I do not know are saying the performance. Javascript costs me to get used to their paradigm , and do not know if at all sure to cover everything with Javascript. Django and python ( very poor knowledge ) Java , experience in data structure and android , but not web . Regarding the / s databases: In my head I have to MongoDB and costs change of opinion by another database with respect to documentation and EASE performance . But .......... frameworks have no support at all clear . I also thought of mixing technologies for using a tecnlogía backend and the frontend other. As I read in the new social network Origo . They use Symfony for REST and javascript for the frontend . ( Backbone , Underscore and RequireJS ) What do you recommend me ?

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• DSOFramer closing Excel doc in another window. If unsaved data in file, dsoframer fails to open with

  - by Steve

  I'm using Microsoft's DSOFramer control to allow me to embed an Excel file in my dialog so the user can choose his sheet, then select his range of cells; it's used with an import button on my dialog. The problem is that when I call the DSOFramer's OPEN function, if I have Excel open in another window, it closes the Excel document (but leaves Excel running). If the document it tries to close has unsaved data, I get a dialog boxclosing Excel doc in another window. If unsaved data in file, dsoframer fails to open with a messagebox: "Attempt to access invalid address". I built the source, and stepped through, and its making a call in its CDsoDocObject::CreateFromFile function, calling BindToObject on an object of class IMoniker. The HR is 0x8001010a "The message filter indicated that the application is busy". On that failure, it tries to InstantiateDocObjectServer by classid of CLSID Microsoft Excel Worksheet... this fails with an HRESULT of 0x80040154 "Class not registered". The InstantiateDocObjectServer just calls CoCreateInstance on the classid, first with CLSCTX_LOCAL_SERVER, then (if that fails) with CLSCTX_INPROC_SERVER. I know DSOFramer is a popular sample project for embedding Office apps in various dialogs and forms. I'm hoping someone else has had this problem and might have some insight on how I can solve this. I really don't want it to close any other open Excel documents, and I really don't want it to error-out if it can't close the document due to unsaved data. Update 1: I've tried changing the classid that's passed in to "Excel.Application" (I know that class will resolve), but that didn't work. In CDsoDocObject, it tries to open key "HKEY_CLASSES_ROOT\CLSID{00024500-0000-0000-C000-000000000046}\DocObject", but fails. I've visually confirmed that the key is not present in my registry; The key is present for the guid, but there's no DocObject subkey. It then produces an error message box: "The associated COM server does not support ActiveX document embedding". I get similar (different key, of course) results when I try to use the Excel.Workbook programid. Update 2: I tried starting a 2nd instance of Excel, hoping that my automation would bind to it (being the most recently invoked) instead of the problem Excel instance, but it didn't seem to do that. Results were the same. My problem seems to have boiled down to this: I'm calling the BindToObject on an object of class IMoniker, and receiving 0x8001010A (RPC_E_SERVERCALL_RETRYLATER) "The message filter indicated that the application is busy". I've tried playing with the flags passed to the BindToObject (via the SetBindOptions), but nothing seems to make any difference. Update 3: It first tries to bind using an IMoniker class. If that fails, it calls CoCreateInstance for the clsid as a "fallback" method. This may work for other MS Office objects, but when it's Excel, the class is for the Worksheet. I modified the sample to CoCreateInstance _Application, then got the workbooks, then called the Workbooks::Open for the target file, which returns a Worksheet object. I then returned that pointer and merged back with the original sample code path. All working now.

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• W3WP crashes when initializing a collection

  - by asbjornu

  I've created an ASP.NET MVC application that has an initializer attached to the PreApplicationStartMethodAttribute. When initializing, a collection is instantiated that implements an interface I've defined. When I instantiate this collection, w3wp.exe crashes with the following two incomprehensible entries in the event log: Faulting application name: w3wp.exe, version: 7.5.7600.16385, time stamp: 0x4a5bd0eb Faulting module name: clr.dll, version: 4.0.30319.1, time stamp: 0x4ba21eeb Exception code: 0xc00000fd Fault offset: 0x0000000000001177 Faulting process id: 0x1348 Faulting application start time: 0x01cb0224882f4723 Faulting application path: c:\windows\system32\inetsrv\w3wp.exe Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll Report Id: c6a0941e-6e17-11df-864d-000acd16dcdb And: Fault bucket , type 0 Event Name: APPCRASH Response: Not available Cab Id: 0 Problem signature: P1: w3wp.exe P2: 7.5.7600.16385 P3: 4a5bd0eb P4: clr.dll P5: 4.0.30319.1 P6: 4ba21eeb P7: c00000fd P8: 0000000000001177 P9: P10: Attached files: These files may be available here: Analysis symbol: Rechecking for solution: 0 Report Id: c6a0941e-6e17-11df-864d-000acd16dcdb Report Status: 0 If I remove the instantiation of the collection, the application starts normally. If I leave the instantiation, w3wp crashes. If I modify the interface, w3wp still crashes. I've tried every variation I could come up with on the theme of keeping the instantiation but doing everything else differently, but w3wp still crashes. My biggest issue here is that I have absolutely no idea why w3wp is crashing. It's not a StackOverflowException or anything concrete like that, all I get is the unintelligent junk cited above. I've tried to use DebugDiag and IISState to debug the w3wp process, but DebugDiag is only available for post-dump analysis in x64 (I'm running on Windows 7 x64, so the w3wp process is thus 64 bit) and IISStat says the following when I try to run it: D:\Programs\iisstate>IISState.exe -p 9204 -d Symbol search path is: SRV*D:\Programs\iisstate\symbols*http://msdl.microsoft.com/download/symbols IISState is limited to processes associated with IIS. If you require a generic debugger, please use WinDBG or CDB. They are available for download from http://www.microsoft.com/ddk/debugging. This error may also occur if a debugger is already attached to the process being checked. Incorrect Process Attachment I've double-checked 10 times that the process ID of my w3wp process is correct. I'm suspecting that IISState too only can debug x86 processes. Setting a breakpoint anywhere in the application does absolutely nothing. The break point isn't hit and w3wp crashes as soon as the request comes through to IIS from the browser. Starting the application with F5 in Visual Studio 2010 or starting another application to get the w3wp process up and running and then attaching the VS2010 debugger to it and then visiting the faulting application doesn't help. I've also tried to add an HTTP module as described in KB-911816 as well as add this to my web.config file: <configuration> <runtime> <legacyUnhandledExceptionPolicy enabled="true" /> </runtime> </configuration> Needless to say, it makes absolutely no difference. So I'm left with no way to debug the w3wp process, no way to extract any information from it and complete garbage dumped in my event log. If anybody has any idea on how to debug this problem, please let me know! Update My collection was initialized based on RouteTable.Routes which might have thrown an exception (perhaps by not being initialized itself yet in such an early stage of the ASP.NET lifecycle). Postponing the communication with RouteTable.Routes until a later stage solved the problem. While I don't really need an answer to this question anymore, I still find it so obscure that I'll leave it for anyone to comment on and answer, because I found no existing posts on this problem anywhere, so it might be of good reference in the future.

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• Android: canvas.drawBitmap with Orientation(MagnetField)Sensor

  - by user368374

  hallo, i am developing Android app with orientation sensor. now i got problem. What i want to do is, change scale and position of bitmap which read from sd card. The scale and position depend on value from orientation sensor. i use canvas.drawBitmap(), then it cause problem. the app is just shut down. other drawXXX()methods have no problem..any suggestion? public class AnMagImgtestActivity extends Activity implements SensorEventListener { private SensorManager sensorManager; private MySurfaceView view; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE); view = new MySurfaceView(this); ///make it fullscreen getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); requestWindowFeature(Window.FEATURE_NO_TITLE); ///give screen a hiropon getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(view); } @Override protected void onResume() { super.onResume(); List sensors = sensorManager.getSensorList(Sensor.TYPE_ORIENTATION); if (sensors.size() 0) { Sensor sensor = sensors.get(0); sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME); } } @Override protected void onPause() { super.onPause(); sensorManager.unregisterListener(this); } @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { } @Override public void onSensorChanged(SensorEvent event) { view.onValueChanged(event.values); } class MySurfaceView extends SurfaceView implements SurfaceHolder.Callback{ public MySurfaceView(Context context) { super(context); getHolder().addCallback(this); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { onValueChanged(new float[3]); } @Override public void surfaceCreated(SurfaceHolder holder) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { } void onValueChanged(float[] values) { Canvas canvas = getHolder().lockCanvas(); //String imgfn = "/sdcard/seekcamera"+"/"+regcode+"/to"+"/"+tempnum+".jpg"; String imgfn = "/sdcard/seekcamera"+"/de"+"/to"+"1.jpg"; //String imgfn = "/sdcard/seekcamera"+"/00"+"/00"+"/"+"42.jpg"; File mf = new File(imgfn); Bitmap bitmap0 = BitmapFactory.decodeFile(mf.getPath()); if (canvas != null) { Paint paint = new Paint(); paint.setAntiAlias(true); paint.setColor(Color.GREEN); paint.setTextSize(12); canvas.drawColor(Color.BLACK); paint.setAlpha(200); for (int i = 0; i < values.length; i++) { canvas.drawText("values[" + i + "]: " + values[i], 0, paint.getTextSize() * (i + 1), paint); } paint.setColor(Color.WHITE); paint.setTextSize(100+values[2]); paint.setAlpha( (int) (255-values[2])); canvas.drawText("Germany", values[0]*1+20, paint.getTextSize() * 1+values[2]-80, paint); ///here is the problem.. canvas.drawBitmap(bitmap0, values[0],values[1], paint); getHolder().unlockCanvasAndPost(canvas); } } } }

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• Android ProgressDialog Progress Bar doing things in the right order

  - by FauxReal

  I just about got this, but I have a small problem in the order of things going off. Specifically, in my thread() I am setting up an array that is used by a Spinner. Problem is the Spinner is all set and done basically before my thread() is finished, so it sets itself up with a null array. How do I associate the spinners ArrayAdapter with an array that is being loaded by another thread? I've cut the code down to what I think is necessary to understand the problem, but just let me know if more is needed. The problem occurs whether or not refreshData() is called. Along the same lines, sometimes I want to call loadData() from the menu. Directly following loadData() if I try to fire a toast on the next line this causes a forceclose, which is also because of how I'm implementing ProgressDialog. THANK YOU FOR LOOKING public class CMSHome extends Activity { private static List<String> pmList = new ArrayList<String>(); // Instantiate helpers PMListHelper plh = new PMListHelper(); ProjectObjectHelper poc = new ProjectObjectHelper(); // These objects hold lists and methods for dealing with them private Employees employees; private Projects projects; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // Loads data from filesystem, or webservice if necessary loadData(); // Capture spinner and associate pmList with it through ArrayAdapter spinner = (Spinner) findViewById(R.id.spinner); ArrayAdapter<String> adapter = new ArrayAdapter<String>( this, android.R.layout.simple_spinner_item, pmList); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinner.setAdapter(adapter); //---the button is wired to an event handler--- Button btn1 = (Button)findViewById(R.id.btnGetProjects); btn1.setOnClickListener(btnListAllProjectsListener); spinner.setOnItemSelectedListener(new MyOnItemSelectedListener()); } private void loadData() { final ProgressDialog pd = ProgressDialog.show(this, "Please wait", "Loading Data...", true, false); new Thread(new Runnable(){ public void run(){ employees = plh.deserializeEmployeeData(); projects = poc.deserializeProjectData(); // Check to see if data actually loaded, if not then refresh if ((employees == null) || (projects == null)) { refreshData(); } // Load up pmList for spinner control pmList = employees.getPMList(); pd.dismiss(); } }).start(); } private void refreshData() { // Refresh data for Projects projects = poc.refreshData(); poc.saveProjectData(mCtx, projects); // Refresh data for PMList employees = plh.refreshData(); plh.savePMData(mCtx, employees); } } <---- EDIT ----- I tried changing loadData() to the following after Jims suggestion. Not sure if I did this right, still doesn't work: private void loadData() { final ProgressDialog pd = ProgressDialog.show(this, "Please wait", "Loading Data...", true, false); new Thread(new Runnable(){ public void run(){ employees = plh.deserializeEmployeeData(); projects = poc.deserializeProjectData(); // Check to see if data actually loaded, if not return false if ((employees == null) || (projects == null)) { refreshData(); } pd.dismiss(); runOnUiThread(new Runnable() { public void run(){ // Load up pmList for spinner control pmList = employees.getPMList(); } }); } }).start(); }

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• How to configure a GridView CommandField to trigger Full Page Update in UpdatePanel

  - by Frinavale

  I have 2 user controls on my page. One is used for searching, and the other is used for editing (along with a few other things). The user control that provides the search functionality uses a GridView to display the search results. This GridView has a CommandField used for editing (showEditButton="true"). I would like to place the GridView into an UpdatePanel so that paging through the search results will be smooth. The thing is that when the user clicks the Edit Link (the CommandField) I need to preform a full page postback so that the search user control can be hidden and the edit user control can be displayed. Edit: the reason I need to do a full page postback is because the edit user control is outside of the UpdatePanel that my GridView is in. It is not only outside the UpdatePanel, but it's in a completely different user control. I have no idea how to add the CommandField as a full page postback trigger to the UpdatePanel. The PostBackTrigger (which is used to indicate the controls cause a full page postback) takes a ControlID as a parameter; however the CommandButton does not have an ID...and you can see why I'm having a problem with this. Update on what else I've tried to solve the problem: I took a new approach to solving the problem. In my new approach, I used a TemplateField instead of a CommandField. I placed a LinkButton control in the TemplateField and gave it a name. During the GridView's RowDataBound event I retrieved the LinkButton control and added it to the UpdatePanel's Triggers. This is the ASP Markup for the UpdatePanel and the GridView <asp:UpdatePanel ID="SearchResultsUpdateSection" runat="server"> <ContentTemplate> <asp:GridView ID="SearchResultsGrid" runat="server" AllowPaging="true" AutoGenerateColumns="false"> <Columns> <asp:TemplateField> <HeaderTemplate></HeaderTemplate> <ItemTemplate> <asp:LinkButton ID="Edit" runat="server" Text="Edit"></asp:LinkButton> </ItemTemplate> </asp:TemplateField> <asp:BoundField ...... </Columns> </asp:GridView> </ContentTemplate> </asp:UpdatePanel> In my VB.NET code. I implemented a function that handles the GridView's RowDataBound event. In this method I find the LinkButton for the row being bound to, create a PostBackTrigger for the LinkButton, and add it to the UpdatePanel's Triggers. This means that a PostBackTrigger is created for every "edit" LinkButton in the GridView Edit: this did not create a PostBackTrigger for Every "edit" LinkButton because the ID is the same for all LinkButtons in the GridView. Private Sub SearchResultsGrid_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles SearchResultsGrod.RowDataBound If e.Row.RowType = DataControlRowType.Header Then ''I am doing stuff here that does not pertain to the problem Else Dim editLink As LinkButton = CType(e.Row.FindControl("Edit"), LinkButton) If editLink IsNot Nothing Then Dim fullPageTrigger As New PostBackTrigger fullPageTrigger.ControlID = editLink.ID SearchResultsUpdateSection.Triggers.Add(fullPageTrigger) End If End If End Sub And instead of handling the GridView's RowEditing event for editing purposes i use the RowCommand instead. Private Sub SearchResultsGrid_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles SearchResultsGrid.RowCommand RaiseEvent EditRecord(Me, New EventArgs()) End Sub This new approach didn't work at all because all of the LinkButtons in the GridView have the same ID. After reading the MSDN article on the UpdatePanel.Triggers Property I have the impression that Triggers can only be defined declaratively. This would mean that anything I did in the VB code wouldn't work. Any advise would be greatly appreciated. Thanks, -Frinny

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• How to stop OpenGL from applying blending to certain content? (cocos2d/iPhone/OpenGL)

  - by RexOnRoids

  Supporting Info: I use cocos2d to draw a sprite (graph background) on the screen (z:-1). I then use cocos2d to draw lines/points (z:0) on top of the background -- and make some calls to OpenGL blending functions before the drawing to SMOOTH out the lines. Problem: The problem is that: aside from producing smooth lines/points, calling these OpenGL blending functions seems to degrade the underlying sprite (graph background). So there is a tradeoff: I can either have (Case 1) a nice background and choppy lines/points, or I can have (Case 2) nice smooth lines/points and a degraded background. But obviously I need both. The Code: I have included code of the draw() method of the CCLayer for both cases explained above. As you can see, the code producing the difference between Case 1 and Case 2 seems to be 1 or 2 lines involving OpenGL Blending. Case 1 -- MainScene.h (CCLayer): -(void)draw{ int lastPointX = 0; int lastPointY = 0; GLfloat colorMAX = 255.0f; GLfloat valR; GLfloat valG; GLfloat valB; if([self.myGraphManager ready]){ valR = (255.0f/colorMAX)*1.0f; valG = (255.0f/colorMAX)*1.0f; valB = (255.0f/colorMAX)*1.0f; NSEnumerator *enumerator = [[self.myGraphManager.currentCanvas graphPoints] objectEnumerator]; GraphPoint* object; while ((object = [enumerator nextObject])) { if(object.filled){ /*Commenting out the following two lines induces a problem of making it impossible to have smooth lines/points, but has merit in that it does not degrade the background sprite.*/ //glEnable (GL_BLEND); //glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE); glEnable (GL_LINE_SMOOTH); glLineWidth(1.5f); glColor4f(valR, valG, valB, 1.0); ccDrawLine(ccp(lastPointX, lastPointY), ccp(object.position.x, object.position.y)); lastPointX = object.position.x; lastPointY = object.position.y; glPointSize(3.0f); glEnable(GL_POINT_SMOOTH); glHint(GL_POINT_SMOOTH_HINT, GL_NICEST); ccDrawPoint(ccp(lastPointX, lastPointY)); } } } } Case 2 -- MainScene.h (CCLayer): -(void)draw{ int lastPointX = 0; int lastPointY = 0; GLfloat colorMAX = 255.0f; GLfloat valR; GLfloat valG; GLfloat valB; if([self.myGraphManager ready]){ valR = (255.0f/colorMAX)*1.0f; valG = (255.0f/colorMAX)*1.0f; valB = (255.0f/colorMAX)*1.0f; NSEnumerator *enumerator = [[self.myGraphManager.currentCanvas graphPoints] objectEnumerator]; GraphPoint* object; while ((object = [enumerator nextObject])) { if(object.filled){ /*Enabling the following two lines gives nice smooth lines/points, but has a problem in that it degrades the background sprite.*/ glEnable (GL_BLEND); glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glHint (GL_LINE_SMOOTH_HINT, GL_DONT_CARE); glEnable (GL_LINE_SMOOTH); glLineWidth(1.5f); glColor4f(valR, valG, valB, 1.0); ccDrawLine(ccp(lastPointX, lastPointY), ccp(object.position.x, object.position.y)); lastPointX = object.position.x; lastPointY = object.position.y; glPointSize(3.0f); glEnable(GL_POINT_SMOOTH); glHint(GL_POINT_SMOOTH_HINT, GL_NICEST); ccDrawPoint(ccp(lastPointX, lastPointY)); } } } }

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• Curl Certificate Error when Using RVM to install Ruby 1.9.2

  - by Will Dennis

  RVM is running into a certificate error when trying to download ruby 1.9.2. It looks like curl is having a certificate issue but I am not sure how to bypass it. NAy help would be great. Thanks so much, I have included the exact error info below. $ rvm install 1.9.2 Installing Ruby from source to: /Users/willdennis/.rvm/rubies/ruby-1.9.2-p180, this may take a while depending on your cpu(s)... ruby-1.9.2-p180 - #fetching ERROR: Error running 'bunzip2 '/Users/willdennis/.rvm/archives/ruby-1.9.2-p180.tar.bz2'', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/extract.log ruby-1.9.2-p180 - #extracting ruby-1.9.2-p180 to /Users/willdennis/.rvm/src/ruby-1.9.2-p180 ruby-1.9.2-p180 - #extracted to /Users/willdennis/.rvm/src/ruby-1.9.2-p180 Fetching yaml-0.1.3.tar.gz to /Users/willdennis/.rvm/archives curl: (60) SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed More details here: http://curl.haxx.se/docs/sslcerts.html curl performs SSL certificate verification by default, using a "bundle" of Certificate Authority (CA) public keys (CA certs). The default bundle is named curl-ca-bundle.crt; you can specify an alternate file using the --cacert option. If this HTTPS server uses a certificate signed by a CA represented in the bundle, the certificate verification probably failed due to a problem with the certificate (it might be expired, or the name might not match the domain name in the URL). If you'd like to turn off curl's verification of the certificate, use the -k (or --insecure) option. ERROR: There was an error, please check /Users/willdennis/.rvm/log/ruby-1.9.2-p180/*.log. Next we'll try to fetch via http. Trying http:// URL instead. curl: (60) SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed More details here: http://curl.haxx.se/docs/sslcerts.html curl performs SSL certificate verification by default, using a "bundle" of Certificate Authority (CA) public keys (CA certs). The default bundle is named curl-ca-bundle.crt; you can specify an alternate file using the --cacert option. If this HTTPS server uses a certificate signed by a CA represented in the bundle, the certificate verification probably failed due to a problem with the certificate (it might be expired, or the name might not match the domain name in the URL). If you'd like to turn off curl's verification of the certificate, use the -k (or --insecure) option. ERROR: There was an error, please check /Users/willdennis/.rvm/log/ruby-1.9.2-p180/*.log Extracting yaml-0.1.3.tar.gz to /Users/willdennis/.rvm/src ERROR: Error running 'tar zxf /Users/willdennis/.rvm/archives/yaml-0.1.3.tar.gz -C /Users/willdennis/.rvm/src --no-same-owner', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/extract.log /Users/willdennis/.rvm/scripts/functions/packages: line 55: cd: /Users/willdennis/.rvm/src/yaml-0.1.3: No such file or directory Configuring yaml in /Users/willdennis/.rvm/src/yaml-0.1.3. ERROR: Error running ' ./configure --prefix="/Users/willdennis/.rvm/usr" ', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/configure.log Compiling yaml in /Users/willdennis/.rvm/src/yaml-0.1.3. ERROR: Error running '/usr/bin/make ', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/make.log Installing yaml to /Users/willdennis/.rvm/usr ERROR: Error running '/usr/bin/make install', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/yaml/make.install.log ruby-1.9.2-p180 - #configuring ERROR: Error running ' ./configure --prefix=/Users/willdennis/.rvm/rubies/ruby-1.9.2-p180 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/willdennis/.rvm/usr ', please read /Users/willdennis/.rvm/log/ruby-1.9.2-p180/configure.log ERROR: There has been an error while running configure. Halting the installation. Will

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• Forms Authentication works on dev server but not production server (same SQL db)

  - by Desmond

  Hi, I have the same problem as a previously solved question however, this solution did not help me. I have posted the previous question and answer below: http://stackoverflow.com/questions/2215963/forms-authentication-works-on-dev-server-but-not-production-server-same-sql-db/2963985#2963985 Question: I've never had this problem before, I'm at a total loss. I have a SQL Server 2008 database with ASP.NET Forms Authentication, profiles and roles created and is functional on the development workstation. I can login using the created users without problem. I back up the database on the development computer and restore it on the production server. I xcopy the DLLs and ASP.NET files to the server. I make the necessary changes in the web.config, changing the SQL connection strings to point to the production server database and upload it. I've made sure to generate a machine key and it is the same on both the development web.config and the production web.config. And yet, when I try to login on the production server, the same user that I'm able to login successfully with on the development computer, fails on the production server. There is other content in the database, the schema generated by FluentNHibernate. This content is able to be queried successfully on both development and production servers. This is mind boggling, I believe I've verified everything, but obviously it is still not working and I must have missed something. Please, any ideas? Answer: I ran into a problem with similar symptoms at one point by forgetting to set the applicationName attribute in the web.config under the membership providers element. Users are associated to a specific application. Since I didn't set the applicationName, it defaulted to the application path (something like "/MyApplication"). When it was moved to production, the path changed (for example to "/WebSiteFolder/SomeSubFolder /MyApplication"), so the application name defaulted to the new production path and an association could not be made to the original user accounts that were set up in development. Could your issues possibly be the same as mine? I have this already in my web.config but still get the issue. Any ideas? <membership> <providers> <clear/> <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" passwordStrengthRegularExpression="" applicationName="/"/> </providers> </membership> <profile> <providers> <clear/> <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="ApplicationServices" applicationName="/"/> </providers> </profile> <roleManager enabled="false"> <providers> <clear/> <add connectionStringName="ApplicationServices" applicationName="/" name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/> <add applicationName="/" name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/> </providers> </roleManager> Any help is greatly appriciated.

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• Dependency Injection: Jetty 7

  - by Malax

  Hi StackOverflow! My application requires several interface implementations which require a Jetty server to do their job. This is, however, not necessarily the case in every implementations of those interfaces so the Jetty server is only a dependency. Since it would be a huge amount of pain to wrap the entire jetty server with all its logging, connector and Handler configurations, I want to inject the server to those implementations with Spring. I decided that injecting the Server class is not a good idea because an implementation could stop the server even if its required at another location. Currently I inject empty HandlerList classes to those implementations and they register their handlers to avoid those problems. The Problem: Those handlers might interfere with other handlers for example: implementation one might register a handler for /foo and implementation two too... problem. Has anyone used Jetty in such an environment? And how could this problem be solved? My XML to clarify my problem: <bean id="jetty" class="org.eclipse.jetty.server.Server" destroy-method="stop"> <property name="connectors"> <list> <bean class="org.eclipse.jetty.server.bio.SocketConnector"> <property name="host" value="10.8.0.46" /> <property name="port" value="9999" /> </bean> </list> </property> <property name="handler"> <bean class="org.eclipse.jetty.server.handler.HandlerCollection"> <property name="handlers"> <list> <ref bean="jetty.handlerList" /> <bean class="org.eclipse.jetty.server.handler.RequestLogHandler"> <property name="requestLog"> <bean class="org.eclipse.jetty.server.NCSARequestLog"> <constructor-arg value="${jetty.logfile}" /> <property name="extended" value="false"/> </bean> </property> </bean> </list> </property> </bean> </property> <property name="sendServerVersion" value="false" /> </bean> <bean id="jetty.handlerList" class="org.eclipse.jetty.server.handler.HandlerList" /> If I require an empty HandlerList I use something like this where com.example.myapp.util.ioc.CreateHandlerListFactory is a org.springframework.beans.factory.FactoryBean which creates a new HandlerList within the given HandlerList. <constructor-arg> <bean class="com.example.myapp.util.ioc.CreateHandlerListFactory"> <constructor-arg ref="jetty.handlerList"/> </bean> </constructor-arg>

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• Deserializing Metafile

  - by Kildareflare

  I have an application that works with Enhanced Metafiles. I am able to create them, save them to disk as .emf and load them again no problem. I do this by using the gdi32.dll methods and the DLLImport attribute. However, to enable Version Tolerant Serialization I want to save the metafile in an object along with other data. This essentially means that I need to serialize the metafile data as a byte array and then deserialize it again in order to reconstruct the metafile. The problem I have is that the deserialized data would appear to be corrupted in some way, since the method that I use to reconstruct the Metafile raises a "Parameter not valid exception". At the very least the pixel format and resolutions have changed. Code use is below. [DllImport("gdi32.dll")] public static extern uint GetEnhMetaFileBits(IntPtr hemf, uint cbBuffer, byte[] lpbBuffer); [DllImport("gdi32.dll")] public static extern IntPtr SetEnhMetaFileBits(uint cbBuffer, byte[] lpBuffer); [DllImport("gdi32.dll")] public static extern bool DeleteEnhMetaFile(IntPtr hemf); The application creates a metafile image and passes it to the method below. private byte[] ConvertMetaFileToByteArray(Image image) { byte[] dataArray = null; Metafile mf = (Metafile)image; IntPtr enhMetafileHandle = mf.GetHenhmetafile(); uint bufferSize = GetEnhMetaFileBits(enhMetafileHandle, 0, null); if (enhMetafileHandle != IntPtr.Zero) { dataArray = new byte[bufferSize]; GetEnhMetaFileBits(enhMetafileHandle, bufferSize, dataArray); } DeleteEnhMetaFile(enhMetafileHandle); return dataArray; } At this point the dataArray is inserted into an object and serialized using a BinaryFormatter. The saved file is then deserialized again using a BinaryFormatter and the dataArray retrieved from the object. The dataArray is then used to reconstruct the original Metafile using the following method. public static Image ConvertByteArrayToMetafile(byte[] data) { Metafile mf = null; try { IntPtr hemf = SetEnhMetaFileBits((uint)data.Length, data); mf = new Metafile(hemf, true); } catch (Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); } return (Image)mf; } The reconstructed metafile is then saved saved to disk as a .emf (Model) at which point it can be accessed by the Presenter for display. private static void SaveFile(Image image, String filepath) { try { byte[] buffer = ConvertMetafileToByteArray(image); File.WriteAllBytes(filepath, buffer); //will overwrite file if it exists } catch (Exception ex) { System.Windows.Forms.MessageBox.Show(ex.Message); } } The problem is that the save to disk fails. If this same method is used to save the original Metafile before it is serialized everything is OK. So something is happening to the data during serialization/deserializtion. Indeed if I check the Metafile properties in the debugger I can see that the ImageFlags, PropertyID, resolution and pixelformats change. Original Format32bppRgb changes to Format32bppArgb Original Resolution 81 changes to 96 I've trawled though google and SO and this has helped me get this far but Im now stuck. Does any one have enough experience with Metafiles / serialization to help..? EDIT: If I serialize/deserialize the byte array directly (without embedding in another object) I get the same problem.

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• WCF and Firewalls

  - by Amitd

  Hi guys, As a part of learning WCF, I was trying to use a simple WCF client-server code . http://weblogs.asp.net/ralfw/archive/2007/04/14/a-truely-simple-example-to-get-started-with-wcf.aspx but I'm facing strange issues.I was trying out the following. Client(My) IP address is : 192.168.2.5 (internal behind firewall) Server IP address is : 192.168.50.30 port : 9050 (internal behind firewall) Servers LIVE/External IP (on internet ) : 121.225.xx.xx (accessible from internet) When I specify the above I.P address of server(192.168.50.30), the client connects successfully and can call servers methods. Now suppose if I want to give my friend (outside network/on internet) the client with server's live I.P, i get an ENDPOINTNOTFOUND exceptions. Surprisingly if I run the above client specifying LIVE IP(121.225.xx.xx) of server i also get the same exception. I tried to debug the problem but haven't found anything. Is it a problem with the company firewall not forwarding my request? or is it a problem with the server or client . Is something needed to be added to the server/client to overcome the same problem? Or are there any settings on the firewall that need to be changed like port forwarding? (our network admin has configured the port to be accessible from the internet.) is it a authentication issue? Code is available at . http://www.ralfw.de/weblog/wcfsimple.txt http://weblogs.asp.net/ralfw/archive/2007/04/14/a-truely-simple-example-to-get-started-with-wcf.aspx i have just separated the client and server part in separate assemblies.rest is same. using System; using System.Collections.Generic; using System.Text; using System.ServiceModel; namespace WCFSimple.Contract { [ServiceContract] public interface IService { [OperationContract] string Ping(string name); } } namespace WCFSimple.Server { [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] class ServiceImplementation : WCFSimple.Contract.IService { #region IService Members public string Ping(string name) { Console.WriteLine("SERVER - Processing Ping('{0}')", name); return "Hello, " + name; } #endregion } public class Program { private static System.Threading.AutoResetEvent stopFlag = new System.Threading.AutoResetEvent(false); public static void Main() { ServiceHost svh = new ServiceHost(typeof(ServiceImplementation)); svh.AddServiceEndpoint( typeof(WCFSimple.Contract.IService), new NetTcpBinding(), "net.tcp://localhost:8000"); svh.Open(); Console.WriteLine("SERVER - Running..."); stopFlag.WaitOne(); Console.WriteLine("SERVER - Shutting down..."); svh.Close(); Console.WriteLine("SERVER - Shut down!"); } public static void Stop() { stopFlag.Set(); } } } namespace WCFSimple { class Program { static void Main(string[] args) { Console.WriteLine("WCF Simple Demo"); // start server System.Threading.Thread thServer = new System.Threading.Thread(WCFSimple.Server.Program.Main); thServer.IsBackground = true; thServer.Start(); System.Threading.Thread.Sleep(1000); // wait for server to start up // run client ChannelFactory<WCFSimple.Contract.IService> scf; scf = new ChannelFactory<WCFSimple.Contract.IService>( new NetTcpBinding(), "net.tcp://localhost:8000"); WCFSimple.Contract.IService s; s = scf.CreateChannel(); while (true) { Console.Write("CLIENT - Name: "); string name = Console.ReadLine(); if (name == "") break; string response = s.Ping(name); Console.WriteLine("CLIENT - Response from service: " + response); } (s as ICommunicationObject).Close(); // shutdown server WCFSimple.Server.Program.Stop(); thServer.Join(); } } } Any help?

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• How do I use connect to DB2 with DBI and mod_perl?

  - by Matthew

  I'm having issues with getting DBI's IBM DB2 driver to work with mod_perl. My test script is: #!/usr/bin/perl use strict; use CGI; use Data::Dumper; use DBI; { my $q; my $dsn; my $username; my $password; my $sth; my $dbc; my $row; $q = CGI->new; print $q->header; print $q->start_html(); $dsn = "DBI:DB2:SAMPLE"; $username = "username"; $password = "password"; print "<pre>".$q->escapeHTML(Dumper(\%ENV))."</pre>"; $dbc = DBI->connect($dsn, $username, $password); $sth = $dbc->prepare("SELECT * FROM SOME_TABLE WHERE FIELD='SOMETHING'"); $sth->execute(); $row = $sth->fetchrow_hashref(); print "<pre>".$q->escapeHTML(Dumper($row))."</pre>"; print $q->end_html; } This script works as CGI but not under mod_perl. I get this error in apache's error log: DBD::DB2::dr connect warning: [unixODBC][Driver Manager]Data source name not found, and no default driver specified at /usr/lib/perl5/site_perl/5.8.8/Apache/DBI.pm line 190. DBI connect('SAMPLE','username',...) failed: [unixODBC][Driver Manager]Data source name not found, and no default driver specified at /data/www/perl/test.pl line 15 First of all, why is it using ODBC? The native DB2 driver is installed (hence it works as CGI). Running Apache 2.2.3, mod_perl 2.0.4 under RHEL5. This guy had the same problem as me: http://www.mail-archive.com/[email protected]/msg22909.html But I have no idea how he fixed it. What does mod_php4 have to do with mod_perl? Any help would be greatly appreciated, I'm having no luck with google. Update: As james2vegas pointed out, the problem has something to do with PHP: I disable PHP all together I get the a different error: Total Environment allocation failure! Did you set up your DB2 client environment? I believe this error is to do with environment variables not being set up correctly, namely DB2INSTANCE. However, I'm not able to turn off PHP to resolve this problem (I need it for some legacy applications). So I now have 2 questions: How can I fix the original issue without disabling PHP all together? How can I fix the environment issue? I've set DB2INSTANCE, DB2_PATH and SQLLIB variables correctly using SetEnv and PerlSetEnv in httpd.conf, but with no luck. Note: I've edited the code to determine if the problem was to do with Global Variable Persistence.

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• searchdisplaycontroller: change the text of the searchbar

  - by kudorgyozo

  Hello, SHORT DESCRIPTION OF PROBLEM: I want to set the text of a searchbar without automatically triggering the search display controller that is bound to it. LONG DESCRIPTION OF PROBLEM: I have an iphone application with a search bar and a search display controller. The searchdisplaycontroller is used for autocomplete. For autocomplete i use an sqlite database. The user enters the first few letters of a keyword and the result are shown in the table of the searchdisplaycontroller. An sql select query is executed for every character typed. this part works ok, the letters have been entered and the results are visible. The problem is the following: If the user selects a row from the table I want to change the text of the searchbar to the text that was selected in the autocomplete results table. I also want to hide the search display controller. This is not working. After the search display controller disappears the textbox in the search bar is empty. I have no idea what's wrong. I didn't think something so simple as changing the text of a textbox can get so complicated. I have tried to change the text in 2 methods: First in the didSelectRowAtIndexPath method (for the search results table of the search display controller), but that didn't help. The text was there while the search display controller was active (animating away) but after that the textbox was empty. - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSLog(@"didSelectRowAtIndexPath"); if (allKeywords.count 0) { didSelectKeyword = TRUE; self.selectedKeyword = (NSString *)[allKeywords objectAtIndex: indexPath.row]; NSLog(@"keyword didselectrow at idxp: %@", self.selectedKeyword); shouldReloadResults = FALSE; [[self.mainViewController keywordSearchBar] setText: selectedKeyword]; //shouldReloadResults = TRUE; [[mainViewController searchDisplayController] setActive:NO animated: YES]; } } I also tried to change it in the searchDisplayControllerDidEndSearch method but that didn't help either. The textbox was...again.. empty. edit: actually it wasnt empty the text was there but after the disappearing animation the results of the autocomplete table are still there. So it ends up getting worse. - (void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller { NSLog(@"searchDisplayControllerDidEndSearch"); if (didSelectKeyword) { shouldReloadResults = FALSE; NSLog(@"keyword sdc didendsearch: %@", selectedKeyword); [[mainViewController keywordSearchBar] setText: selectedKeyword]; // In this method i call another method which selects the data from sqlite. This part is working. - (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString { NSLog(@"shouldReloadResults : %i", shouldReloadResults); if (shouldReloadResults) { NSLog(@"shouldReloadTableForSearchString: %@", searchString); [self GetKeywords: searchString : @"GB"]; NSLog(@"shouldReloadTableForSearchString vege"); return YES; } return NO; } Please ask me if it's not clear what my problem is. I need your help. Thank you

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• Const references when dereferencing iterator on set, starting from Visual Studio 2010

  - by Patrick

  Starting from Visual Studio 2010, iterating over a set seems to return an iterator that dereferences the data as 'const data' instead of non-const. The following code is an example of something that does compile on Visual Studio 2005, but not on 2010 (this is an artificial example, but clearly illustrates the problem we found on our own code). In this example, I have a class that stores a position together with a temperature. I define comparison operators (not all them, just enough to illustrate the problem) that only use the position, not the temperature. The point is that for me two instances are identical if the position is identical; I don't care about the temperature. #include <set> class DataPoint { public: DataPoint (int x, int y) : m_x(x), m_y(y), m_temperature(0) {} void setTemperature(double t) {m_temperature = t;} bool operator<(const DataPoint& rhs) const { if (m_x==rhs.m_x) return m_y<rhs.m_y; else return m_x<rhs.m_x; } bool operator==(const DataPoint& rhs) const { if (m_x!=rhs.m_x) return false; if (m_y!=rhs.m_y) return false; return true; } private: int m_x; int m_y; double m_temperature; }; typedef std::set<DataPoint> DataPointCollection; void main(void) { DataPointCollection points; points.insert (DataPoint(1,1)); points.insert (DataPoint(1,1)); points.insert (DataPoint(1,2)); points.insert (DataPoint(1,3)); points.insert (DataPoint(1,1)); for (DataPointCollection::iterator it=points.begin();it!=points.end();++it) { DataPoint &point = *it; point.setTemperature(10); } } In the main routine I have a set to which I add some points. To check the correctness of the comparison operator, I add data points with the same position multiple times. When writing the contents of the set, I can clearly see there are only 3 points in the set. The for-loop loops over the set, and sets the temperature. Logically this is allowed, since the temperature is not used in the comparison operators. This code compiles correctly in Visual Studio 2005, but gives compilation errors in Visual Studio 2010 on the following line (in the for-loop): DataPoint &point = *it; The error given is that it can't assign a "const DataPoint" to a [non-const] "DataPoint &". It seems that you have no decent (= non-dirty) way of writing this code in VS2010 if you have a comparison operator that only compares parts of the data members. Possible solutions are: Adding a const-cast to the line where it gives an error Making temperature mutable and making setTemperature a const method But to me both solutions seem rather 'dirty'. It looks like the C++ standards committee overlooked this situation. Or not? What are clean solutions to solve this problem? Did some of you encounter this same problem and how did you solve it? Patrick

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