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• Firefox only shows a black window over RDP

  - by Andrew Aylett

  I have a Windows 7 desktop running Firefox 4. If I remote-desktop (RDP) from another PC into my already-running session, the Firefox window turns black. Flash applications are still visible, if I'm on a tab with one, and I can apparently interact with Firefox normally, I just can't see anything in the window. I'm after an explanation, if possible, and (even better!) a workaround or fix that doesn't involve a different web browser :).

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• Should I use DTOs as my data models in MVVM?

  - by JonC

  I'm currently working on what will be my first real foray into using MVVM and have been reading various articles on how best to implement it. My current thoughts are to use my data models effectively as data transfer objects, make them serializable and have them exist on both the client and server sides. It seems like a logical step given that both object types are really just collections of property getters and setters and another layer in between seems like complete overkill. Obviously there would be issues with INotifyPropertyChanged not working correctly on the server side as there is no ViewModel to which to communicate, but as long as we are careful about constructing our proper domain model objects from data models in the service layer and not dealing the the data models on the server side I don't think it should be a big issue. I haven't found too much info about this approach in my reading, so I would like to know if this is a pretty standard thing, is this just assumed to be the de facto way of doing MVVM in a multi-tier environment? If I've got completely the wrong idea about things then thoughts on other approaches would be appreciated too.

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• Whats the best way to use linux on windows?

  - by rogerstone

  Hi, Hi which is the best way to use linux on windows?I am having windows 7 currently on dell laptop.I want to use linux for development of rails.I have seen that there are a lot options like running directly from usb or cd,installing it,Running it on a virtual box etc... .I would be using linux very frequently.Speed is one of my main concerns.So Which is a good way to go about it for my purpose? Thanks

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• Identify OpenVZ virtual machine from inside

  - by Alfred Godoy

  Is there any way for me to identify which OpenVZ container I am in, from inside the container? I am working on a setup where OpenVZ machines shall boot the same (read-only) disk image, so I can not configure them individually in the file system. I need a unique identification for each of the virtual servers, to be used by scripts running inside the OpenVZ containers. (I'm running Debian Lenny, BTW.)

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• Castle ActiveRecord: session error search and access to lazy loading property in different threads

  - by sc911

  Hi *, I've got a problem with an multi-threaded desktop application using Castle ActiveRecord in C#: To keep the GUI alive while searching for the objects based on userinput I'm using the BackgroundWorker for the search-function. Some of the properties of the objects, especially some HasMany-Relations, are marked as Lazy. Now, when the search is finished and the user selects an resulting object, some of the properties of this object should be displayed. But as the search was done by the BackgroundWorker in a different thread, accessing the properties fails as the session for the lazy-access is no longer available. What will be the best way to do the search in an extra thread to keep the GUI alive and to access all properties correctly including those marked as lazy? Thanks for any advise! Regards sc911

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• Jackrabbit: How to obtain list of DavResources by given url?

  - by kilonet

  Using Jackrabbit WebDAV library, how can I get list of all resources as DavResources objects?

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• HP Smart Array p400i with Intel X25-M 160 SSD

  - by user67304

  I have a pair of x25-M 160 Intel SSD's in an HP DL360 G5 with a p400i Smart Array running 512 BBWC. The disk performance I am getting on this box and another identical one does not come close to matching the same two drives running through a cheap 3ware RAID card. Any idea? I have played with the cache settings, but nothing allows me to get the same results. It seems like the Smart Array controller is the bottleneck.

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• Quickly retrieve the subset of properties used in a huge collection in C#

  - by ccornet

  I have a huge Collection (which I can cast as an enumerable using OfType<()) of objects. Each of these objects has a Category property, which is drawn from a list somewhere else in the application. This Collection can reach sizes of hundreds of items, but it is possible that only, say, 6/30 of the possible Categories are actually used. What is the fastest method to find these 6 Categories? The size of the huge Collection discourages me from just iterating across the entire thing and returning all unique values, so is there a faster method of accomplishing this? Ideally I'd collect the categories into a List.

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• Socket server stops accepting connections after a period of time

  - by Rob

  We have an async socket server written in C#. (running on Windows Web Server 2008) It works flawlessly up until it stop accepting new connections for an unknown reason. We have about 200 concurrent connections on average, however we keep a count of both connections created and connections dropped. These figures can reach as high as 10,000 or as low as only 1000 before it just stops! It can run for up to around 8 hours sometimes before it stops or it can run for about half hour, at the moment it's running for about an hour before we have another application bring it back up automatically when that can't connect (not exactly ideal). It doesn't appear like we're running out of sockets as we're closing them properly, we're also logging all errors and nothing is happening immediately before it stops. We can figure this out. Does anyone have any ideas what might be going on? I can paste code, but it generally just the same old async beginaccept/send code you see everywhere.

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• Explanation of contribute_to_class

  - by anon.

  I'm attempted to extend code, and have come across an issue, I don't understand a line of code. I know the outcome of it - but I don't understand how it happens and am naturally enough scared to change it. The line of code I've come across is this: MyGenericRelation().contribute_to_class(model, 'field_name') The result of this code is a field with 'field_name' is added to the 'model' and from what I gather the objects inside the field are a list of type X (part of MyGenericRelation). I'm wondering if anyone can explain how this works. As in, why do I get a list of X objects attached to 'field_name' and if does it have to be generic relations prior to contribute_to_class or would using an actual model type, say 'Y' just give me a list of Y's. To be honest, I am more interested in the affect and functionality of the contribute_to_class method.

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• R: Using sapply on vector of POSIXct

  - by Chris

  I have what may be a very simple question. I want to process a column of POSIXct objects from a dataframe and generate a vector of datetime strings. I tried to use the following sapply call dt <- sapply(df$datetime, function(x) format(x,"%Y-%m-%dT%H:%M:%S")) but to no avail. I keep getting the following error Error in prettyNum(.Internal(format(x, trim, digits, nsmall, width, 3L, : invalid 'trim' argument When I apply this function to a single POSIXct object from the column, I have no problem. So I'm stumped at the moment about what the problem is. Do I need to do something special with POSIXct objects?

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• django m2m how can i get m2m table elements in a view

  - by dana

  i have a model using m2m feature: class Classroom(models.Model): user = models.ForeignKey(User, related_name = 'classroom_creator') classname = models.CharField(max_length=140, unique = True) date = models.DateTimeField(auto_now=True) open_class = models.BooleanField(default=True) members = models.ManyToManyField(User,related_name="list of invited members", through = 'Membership') and i want to take all members of one class in a view and display them using the template system. In the view, i'm trying to take all the members from a classroom like that: def inside_classroom(request,classname): try: theclass = Classroom.objects.get(classname = classname) members = Members.objects.all() etc but it doesn't work,(though the db_table is named Classroom_Members) i guess i have to use another query for getting all the members from the classroom classname. also, i want to verify if the request.user is a member using (if request.user in members) how can i het those members? Thanks in advance!

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• How do I install Netatalk in Ubuntu 9.10 (tutorial)?

  - by Phobis

  I have never installed Netatalk before. I have to help someone get this up and running on a Ubuntu 9.10 server and I don't know if there is any special configuration or install steps I need to follow in Ubuntu 9.10 to get it up and running. I am doing this remotely through ssh, so I prefer instruction via command-line. Thanks!

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• How to spy on a Mac from a PC

  - by Phenom

  I have a desktop running Windows 7 and a Macbook Pro running Snow Leopard. If someone is using my Macbook Pro, and from my Windows 7 machine I want to see what they see on their screen, is there a way to do that?

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• ACCESS 2003 Excel 2003 : VBA for opening Excel file from Access and copying a pictre from excel the

  - by Justin

  So I have an excel workbook that has a nice global map of shaperange objects. With some very simple code I can change the colors, group and ungroup collections of countries into arrays, etc...and it works pretty well. However, I would like to bring this into Access. So I could copy and paste all the shapes into an access form manually, but then they become pictures and I cannot change the colors of the countries (shaperange objects) to have the map act interactively as I can in excel. So I am thinking that I know how to use excel functions from access, and how to open excel from access. Is there a way to copy an object from excel (I know the file name and the shape name that i mean to copy everytime), and bringing it back to access to paste on a form? Atypical, I know, all my Access questions are. Thanks!

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• How to code a C# Extension method to turn a Domain Model object into an Interface object?

  - by Dr. Zim

  When you have a domain object that needs to display as an interface control, like a drop down list, ifwdev suggested creating an extension method to add a .ToSelectList(). The originating object is a List of objects that have properties identical to the .Text and .Value properties of the drop down list. Basically, it's a List of SelectList objects, just not of the same class name. I imagine you could use reflection to turn the domain object into an interface object. Anyone have any suggestions for C# code that could do this? The SelectList is an MVC drop down list of SelectListItem. The idea of course is to do something like this in the view: <%= Html.DropDownList("City", (IEnumerable<SelectListItem>) ViewData["Cities"].ToSelectList() )

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• Online modelling tool for server desing / architecture

  - by 2ge

  I am looking for some online (the best is free) tool for designing our servers. We use almost 10 servers now, and it becoming mess, to remember, where, what service is running. So, I'd like to have some online modeling tool, where I can set up things like: - server host - server hw parameters - server os - server services with running programs I am looking for server designing tool like online SQL modeling on http://ondras.zarovi.cz/sql/demo/?keyword=default (WWW SQL designer) Any ideas ?

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• asp.mvc model design

  - by Radu D

  Hi, I am pretty new to MVC and I am looking for a way to design my models. I have the MVC web site project and another class library that takes care of data access and constructing the business objects. If I have in that assembly a class named Project that is a business object and I need to display all projects in a view ... should I make another model class Project? In this case the classes will be identical. Do I gain something from doing a new model class? I don't like having in views references to objects from another dll ... but i don't like duplicating the code neither. Did you encounter the same problem?

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• How to use DNS to redirect domain to specific port on my server

  - by Tomaszs

  I'm running a web server on port 80 and another on port 87. I would like to use DNS so that www.example.com goes to port 87. How can I accomplish this using DNS only? Canonical Question: This question was originally asking about running IIS and Apache on the same server, but the same concepts can be applied to any server software receiving connections from clients. The Answers below describe the technical problems with using DNS to assign a port number for a client to connect.

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• Use Cherokee Instead of nginx in Front of Varnish to Get HTTP 1.1 Optimizations?

  - by espeed

  We have been running nginx - uWSGI, and now we are evaluating putting Varnish as a caching layer between nginx and uWSGI (similar to http://www.heroku.com/how/architecture). But, nginx only supports HTTP 1.0 on the back so it will have to create new connections with Varnish for each request. Many recommend running nginx in front of Varnish, but wouldn't it make much more sense to use something like Cherokee so that you eliminate the HTTP connection overhead since it supports HTTP 1.1 on the back?

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• How do I access a web server on a virtualbox from the host machine

  - by Argh

  I have a windows Vista machine upon which VirtualBox is running ubuntu. In ubuntu I am running a webserver at the address http://127.0.0.1:3000/ How do I access this address from my host machine (the windows box)?

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• Oracle sysman password reset and enterprise manager

  - by Aboxy

  We are running oracle 10g.yesterday we had to reset sysman(and all other sys acounts)user with alter user command. Password change command worked by oracle enterprise manager does not see the database running. As per oracle docs,we did change the password(and encryption setting) and restarted the dbconsole service. Password does get encrypted after restarted but em still does not see the database online. Are we missing any other important step? Thanks Aboxy

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• Track/Display Array Index As Part Of Cout (C++)

  - by John Smith

  Hi, I have a command line C++ program that lets you enter basic information about a person (ID number, name, age, etc.) and I want to output to a console in the following manner: ------------------------------------------------------------------- Index ID # First Name Last Name Age ------------------------------------------------------------------- 0 1234 John Smith 25 The person objects are stored in an array of Persons and I've overload the ostream (<<) operator to print out all of the fields like you see. The dashed lines and header come from a displayHdg() function. Anyhow, I have not been able to figure out how to get the proper index value for the array. Ideally, I'd like to generate the indices for each line, but all my attempts have failed. The array is looped through and each object printed in the main() function, and the ostream is overloaded in a person class, so I tried to use global variables as well as static variables, and all of those produce incorrect numbering (i.e. show 0, 1 the first time (for 2 objects), then change to 1, 2 on the next display). Any ideas?

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• What is the best way to interoperably serialize a message?

  - by iwein

  I'm considering message serialization support for spring-integration. This would be useful for various wire level transports to implement guaranteed delivery, but also to allow interoperability with other messaging systems (e.g. through AMQP). The fundamental problem that arises is that a message containing Java object in it's payload and headers should be converted to a byte[] and/or written to a stream. Java's own serialization is clearly not going to cut it because that is not interoperable. My preference would be to create an interface that allows the user to implement the needed logic for all Objects that take part in serialization. Is this a sensible idea and what would the interface look like? Is there a standard interoperable way to serialize Objects that would make sense in this context?

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• proper Django ORM syntax to make this code work in MySQL

  - by gtujan

  I have the following django code working on an sqlite database but for some unknown reason I get a syntax error if I change the backend to MySQL...does django's ORM treat filtering differently in MySQL? def wsjson(request,imei): wstations = WS.objects.annotate(latest_wslog_date=Max('wslog__date'),latest_wslog_time=Max('wslog__time')) logs = WSLog.objects.filter(date__in=[b.latest_wslog_date for b in wstations],time__in=[b.latest_wslog_time for b in wstations],imei__exact=imei) data = serializers.serialize('json',logs) return HttpResponse(data,'application/javascript') The code basically gets the latest logs from WSlog corresponding to each record in WS and serializes it to json. Models are defined as: class WS(models.Model): name = models.CharField(max_length=20) imei = models.CharField(max_length=15) description = models.TextField() def __unicode__(self): return self.name class WSLog(models.Model): imei = models.CharField(max_length=15) date = models.DateField() time = models.TimeField() data1 = models.DecimalField(max_digits=8,decimal_places=3) data2 = models.DecimalField(max_digits=8,decimal_places=3) WS = models.ForeignKey(WS) def __unicode__(self): return self.imei

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