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• Subclassing QGraphicsItemGroup

  - by onurozcelik

  Hi everyone I have system that has classes derived from QGraphicsWidget. I manage derived class objects in layouts on QGraphicsScene. Now I need a compound item that contain two or more QGraphicsWidget in it and also I need to put that item inside my layout. So I choose QGraphicsItemGroup and write I class like this. class CompositeItem : public QGraphicsItemGroup,public QGraphicsLayoutItem { ... }; I only implemented sizeHint function again. When add CompositeItem instance to layout it does not shown. What may cause this? Where I made wrong?

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• Issue while access contacts of android

  - by Rishabh

  I am new for android development. I am trying read and write contacts to android addressbook. I tried following line of code for write name into android public class SecondApp extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ContentValues values = new ContentValues(); values.put(Contacts.People.NAME, "Rishabh"); ContentResolver cr = getContentResolver(); Uri uri = cr.insert(People.CONTENT_URI, values); but i am getting "The application has stopped unexpectedly. Please try again" message. what is wrong in it ? How can i access contacts of android ?

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• automatic enter login credentials while testing my app (from visual studio 2008)

  - by Michel

  Hi all, this is something that i don't want to program, but i was looking for a handy way of logging on to my web app. i'm building (and testing and running) my webapp over and over again, and here i've been provided a strong password. needless to say it's not so nice to enter my full user name + strong password 30 times a day. is there a nifty tool which lives in the background and when i open page localhost/mytestpage.aspx, it will say: "hey, let me type in michel and sdfs%^%gfhg in these two textboxes"?

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• Spatial domain to frequency domain

  - by John Elway

  I know about Fourier Transforms, but I don't know how to apply it here, and I think that is over the top. I gave my ideas of the responses, but I really don't know what I'm looking for... Supposed that you form a low-pass spatial filter h(x,y) that averages all the eight immediate neighbors of a pixel (x,y) but excludes itself. a. Find the equivalent frequency domain filter H(u,v): My answer is to (a): 1/8*H(u-1, v-1) + 1/8*H(u-1, v) + 1/8*H(u-1, v+1) + 1/8*H(u, v-1) + 0 + 1/8*H(u, v+1) + 1/8*H(u+1, v-1) + 1/8*H(u+1, v) + 1/8*H(u-1, v-1) is this the frequency domain? b. Show that your result is again a low-pass filter. does this have to do with the coefficients being positive?

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• If XmlException.SourceUri is read-only, what good is it?

  - by East of Nowhere

  I have a couple places in my code where it throwing a new System.Xml.XmlException seems appropriate. I could just do throw new XmlException("Your XML sucks go fix it then try again."); But I think it's better to take advantage whenever possible of members particular to the exception class (otherwise ya might as well throw a plain ol' Exception every time). SourceUri and LineNumber would be helpful, but they only have get methods, there's no way I can assign a value to them! There's only 3 constructor overloads and none of them have parameters for those members either; I can only initialize Message, nothing else. There has got to be some way to populate those data members with values, otherwise why does XmlException bother with them? I suppose I could make a new class that inherits XmlException and write a new constructor that initializes SourceUri etc. but still, there must be a way to just use XmlException. Right?

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• Android Class which extends Dialog, how to clear TextViews before it is displayed

  - by wuntee

  I have a class that extends android.app.Dialog, the layout is done in an xml file, and the setup (button listeners, etc) is done on the onCreate method. My problem is that whenever the dialog is displayed, then dismissed, and displayed again, the Editable TextViews are still populated with the information that was displayed previously. What is the common way to clear these text fields? Remember - this is a separate class that extends Dialog - so there is no 'onDialogCreate' like Activity has. Or, perhaps I am extending the wrong class? There is just a lot of processing being done, and do not want to have all the code in the main Activity. I would like it to be in a separate Class. I tried to extend AlertDialog, but it does not create the border like Dialog does. Any help would be great. The dialog is shown via the Activity: protected Dialog onCreateDialog(int id) { switch(id){ case DIALOG_NEW_SAFE: return(new NewSafeDialog(this)); default: return(null); } }

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• How do I know whether an application support OLE2 and which methods & attributes are exposed?

  - by Esti

  I want to call an ActiveX DLL or OLE2 object from ABAP. I already know the syntax of how to instantiate the object & execute the methods: data: my_object type ole2_object. create object my_object <ole2object>. call method of my_object <objectmethod>. But given a particular application, how do I know if this is supported, what the values/names of ole2object and objectmethod is? Transaction SOLE supplies a table of OLE Applications, among this is Excel.Application which I know can be instantiated as an OLE object, so it looks like you have to add the OLE2 app to this table first, but once again where can I read the data like CLSID & LibType from - is it published as part of the application?

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• Checkbox 'Checked' in ListView is restored after scrolling

  - by adrianrdzv

  I'm having the following problem: I have a ListActivity, which its ListView is composed by an icon, text and a checkbox (using LayoutInflater). The Adapter for the ListView extends ResourceCursorAdapter (i.e. the data source of the ListView is retrieved from a database, also the Checked status of each row) Everything works pretty Ok, except when I uncheck/check the checkbox in any row, if I scroll down until the modified checkbox is no longer visible, and then scroll up, the checkbox is restored to its original state. The database IS modified, this is not the problem (i.e. if I modify a row and exit the activity, and enter again, the modified row is displayed Ok). My guess is that this has something to do on how the list is rendered because for some reason the ListView "renders" the original state of all rows when it was first populated when scrolling. I've been looking around for this bug but I don't find anybody that had this problem. I appreciate any advice you have.

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• Silly CSS ref problem.

  - by Lucifer

  Hi All, I am having a very weird problem. I cannot for the life of me figure it out. The code for my page (at the moment), is this: <link rel="stylesheet" href="assets/css/default.css" /> But, why does it not load the stylesheet? When I move the stylesheet into the same location as the index.html page, and then change the references to it to point to the root dir, it works again? It never wants to work if the stylesheet is any more than 1 directory deep. Is this normal? Or should it still work?

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• Array value setting in javascript

  - by Dennis

  Hello. Again I'm still new to this javascript thing, so just would like to know if there is another way of setting the values of an array (just like declaring it); //correct way of declaring an array and reusing var adata = new Array('1','2','3'); //reusing of variable adata[0] = '4'; adata[1] = '5'; adata[2] = '6' ** This part is my question; I want to declare the values of the array just like declaring them to minimize the number of lines; //array declaration var data = new Array('1','2','3'); //reusing of variable data = ['4','5','6']; --- (as an example) I get an error msg "Invalid assignment left-hand side" is this possible? If so, what is the correct syntax? I hope I'm making sense. Thanking you in advance.

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• Sign in as different user when using Integrated Windows Authentication

  - by Sam

  I have restricted access to a site by using Integrated Windows Authentication and turning off anonymous access. This way I can then show them their real name (from looking up on Active Directory and using the server variable LOGON_USER) and do other related Active Directory tasks. How can I then prompt again for their user credentials, through a 'sign in as other user' link , showing the browser prompt (like you would get on a browser like Chrome or Firefox, or if the site was not in the 'Intranet' zone in IE) rather than a Web Form? Since SharePoint offers this functionality, I assume there is a way to do this through code, but I don't know what code can do this (using C#). I can send a 401 header which makes the prompt appear, but how do you then confirm if they are logged in?

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• Chained address rewrite in Wordpress

  - by kemp

  What I need to do is rewriting this address: (1) http://localhost/wordpress/fake/text-value to (2) http://localhost/wordpress/gallery?somevar=text-value Notes: the remapping must be transparent: the user always has to see address (1) gallery is a permalink to a wordpress page, not a real address I basically need to rewrite the address first (to modify it) and then feed it back to mod rewrite again (to let wordpress parse it its own way). Problems if I simply do RewriteRule ^fake$ http://localhost/wordpress/gallery [L] it works but the address in the browser changes, which is no good, if I do RewriteRule ^fake$ /wordpress/gallery [L] I get a 404. I tried different flags instead of [L] but to no avail. How can I get this to work?

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• Android: Displaying Video on VideoView

  - by AndroidDev93

  I'm trying to display a video in my sdcard on the video view. Here is my code: String name = Environment.getExternalStorageDirectory() + "/test.mp4"; final VideoView videoView = (VideoView)findViewById(R.id.videoView1); videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { public void onPrepared(MediaPlayer arg0) { videoView.start(); } }); videoView.setVideoPath(name); The file I am trying to open is called test.mp4 and its located within the sdcard folder. I get an error saying the application has unfortunately stopped. I would appreciate it if someone could help me. Thanks. EDIT : I used the debugger and found out that I get an InvocationTargetException. The detailed message says that : Failure delivering result ResultInfo{who=null, request=1001, result=-1, data=Intent { dat=file:///mnt/sdcard/test.mp4 }} to activity : java.lang.NullPointerException EDIT : I looked at the logcat again and it seems to give the error at videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { I'm guessing either videoView or MediaPlayer is null.

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• same logged in user assigned different session ids (in different browsers)

  - by Lyon

  Hi, I've implemented a mysql-based session interface in php. I just found out that if I log in to my account using browser A (e.g. Chrome), and then I log in to the same account in another browser B (e.g. IE), each browser is assigned 2 separate session ids. How can I make it such that when I log in again using browser B, I retain the active session of the previous browser A? The issue at hand is that I'm storing certain information in the session and the data not being synchronised between the same users in different browsers and is wrecking havoc. :S Is there a way to achieve this? Thanks!

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• When defining a class as internal, do you define what would usually be public fields as internal?

  - by devoured elysium

  When defining a class as internal, do you define what would usually be public fields as internal? Or do you leave them as public? I have a set of classes with public/private methods that I have decided to set as internal. Now, should I change the class' modifier to internal and let the rest of the methods/properties as they are (public/private) or switch them to (internal/private)? I don't see a big point in changing it to internal, and if by some reason later I want to set them back to public it's going to give a lot of work to have to put them back to public again. Any other thoughts on this?

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• TableAdapter to return ONLY selected columns? (VS2008)

  - by MattSlay

  (VS2008) I'm trying to configure a TableAdapter in a Typed DataSet to return only a certain subset of columns from the main schema of the table on which it is based, but it always returns the entire schema (all columns) with blank values in the columns I have omitted. The TableAdpater has the default Fill and GetData() methods that come from the wizard, which contain every column in the table, which is fine. I then added a new parameterized query method called GetActiveJobsByCustNo(CustNo), and I only included a few columns in the SQL query that I actually want to be in this table view. But, again, it returns all the columns in the master table schema, with empty values for the columns I omitted. The reason I am wanting this, is so I can just get a few columns back to use that table view with AutoGenerateColumns in an ASP.NET GridView. With it giving me back EVERY column i nthe schema, my presentation GridView contains way more columns that I want to show th user. And, I want to avoid have to declare the columns in the GridView.

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• Expandable listview with selectall checkbox : group itemclick and scrolling bug

  - by Samet

  I have an ExpandableListView with a checkbox next to group name and when expanded, child items with checkbox as well. Let's suppose I have 4 groups with 50 childs. When a group is expanded, and I click on select all checkbox, everything works fine, all checkbox are selected and keep their state if I scroll. But if I scroll untill the last child of the list, scrolling gets buggy after that ( scrolling to the top and then touching the screen to stop the scrolling doesn't work anymore), clicking on group doesn't work anymore too, untill I click on selectall checkbox again. Clicking on a child checkbox does nothing, I must click on selectall checkbox for everything to work. I changed Focusable state of the child checkbox, group checkbox and tried many ways, but I can not find a solution to this. Do you have an idea of where it is coming from?

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• Measuring device drivers CPU/IO utilization caused by my program

  - by Lior Kogan

  Sometimes code can utilize device drivers up to the point where the system is unresponsive. Lately I've optimized a WIN32/VC++ code which made the system almost unresponsive. The CPU usage, however, was very low. The reason was 1000's of creations and destruction of GDI objects (pens, brushes, etc.). Once I refactored the code to create all objects only once - the system became responsive again. This leads me to the question: Is there a way to measure CPU/IO usage of device drivers (GPU/disk/etc) for a given program / function / line of code?

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• Duplicate a Drupal installation from one server to another

  - by irot

  Hello. I have been developing a Drupal 6 site on my PC using XAMPP. I'm done now, and everything looks peachy. Problem is, I need to put all my content (including custom modules and themes) up onto a staging server which only has a fresh Drupal 6 install on it. I can't imagine having to set up all my custom content types and whatnot all over again on the staging server. So I ask, how does one go about doing what I need to do? Which is essentially duplicating my Drupal install from my PC, to the staging server. The staging server is running Linux, and I develop on a Windows PC, if that helps. Thanks in advance.

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• why the hell does x,y = zip(*zip(a,b)) work in Python?

  - by Mike Dewar

  OK I love Python's zip() function. Use it all the time, it's brilliant. Every now and again I want to do the opposite of zip(), think "I used to know how to do that", then google python unzip, then remember that one uses this magical * to unzip a zipped list of tuples. Like this: x = [1,2,3] y = [4,5,6] zipped = zip(x,y) unzipped_x, unzipped_y = zip(*zipped) unzipped_x Out[30]: (1, 2, 3) unzipped_y Out[31]: (4, 5, 6) What on earth is going on? What is that magical asterisk doing? Where else can it be applied and what other amazing awesome things in Python are so mysterious and hard to google?

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• Sharing view logic in Django

  - by Jeremy B.

  I've begun diving into Django again and I'm having trouble finding the parallel to some common concepts from my life in C#. While using .NET MVC I very often find myself creating a base controller which will provide a base action implementation to take care of the type of stuff I want to do on every request, like retrieving user information, getting localization values. Where I'm finding myself confused is how to do this in Django. I am getting more familiar with the MVT concept but I can't seem to find how to solve this scenario. I've looked at class based views and the generic views yet they didn't seem to work how I expected. What am I missing? How can i create default logic that each view will be instructed to run but not have to write it in each view method?

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• How can I get Hudson to be able to access JUnit?

  - by Bedwyr Humphreys

  I've got Hudson running on TOMCAT, it can build my Netbeans project using the ant build.xml, but it won't run any of my unit tests because of what I assume is a problem with the classpath: package org.junit does not exist [javac] import org.junit.After; [javac] ^ But I've got the junit-4.8.1.jar on the classpath in /etc/environment and I can successfuly run the junit tests from a console using java org.junit.runner.JUnitCore org.junit.tests.AllTests My CLASSPATH is set to /home/bedwyr/junit4.8.1/junit-4.8.1.jar:. Am I going wrong somewhere or is there anything else I need to set? [edit] What I did was to export/include (using the ide) all libraries (including Junit) hudson then reads all it needs from the subversion repo. I then ran into an issue with exposing hudson to the internet, and pretty soon gave up on tomcat on ubuntu server (again, to do with the tomcat security manager) - glassfish is a lot smoother and that's where I am now - apache front end with ajp_proxy to hudson on glassfish.

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• python and paramiko: how to check if end of ssh tunnel is still alive and reestablish if not?

  - by Christian

  Hello all, I'm trying to achieve the following: I have two hosts A and B. A establishes a remote port forwarding tunnel on B, i.e. B is the one a port is forwarded on to some where else and A is the one that sets up the tunnel. I tried the script rforward.py that ships with paramiko and it works very well so far. (I'm running rforward.py on A, which connects to B and forwards a port of B to somewhere else) However, when B is shutting down, A doesn't seem to recognize it. I'd rather like A to recognize that B is down and to try to reestablish the connection periodically in case B comes up again. Is there a way to do this? Thanks.

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• XML format for blogs and/or CMS

  - by user288713

  I'm writing my own blog/CMS engine (using WebApp and Google App Engine), and I'm looking for a light-weight XML format to use for content storage. Is there some already existing format that could be used for this purposes? Maybe some subset of the DocBook or ePub format? I had a look at those and they seem to be a little of overkill for what I want to do. Then again WXR (Wordpress eXtended RSS) or the one from Pluxml (pluxml.org) might be suited as well. Any ideas?

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• Silverlight 4 desktop application sometimes zooms when touching it... and cannot zoom out

  - by TimothyP

  Hi, I have a Silverlight 4 desktop application which I control using a touchscreen (on an HP Touchsmart). Most of the time it works fine but sometimes when clicking something everything just zooms in and every time it happens things get bigger and bigger. The only way to get the normal size again is by restarting the application. Has anybody got any idea what might be causing it ? Does not seem to happen in browser mode. Is there a way to prevent zooming? Thnx

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