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  • How do I use the information about exceptions a method throws in .NET in my code?

    - by dotnetdev
    For many methods in .NET, the exceptions they can potentially throw can be as many as 7-8 (one or two methods in XmlDocument, Load() being one I think, can throw this many exceptions). Does this mean I have to write 8 catch blocks to catch all of these exceptions (it is best practise to catch an exception with a specific exception block and not just a general catch block of type Exception). How do I use this information? Thanks

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  • struct and arguments

    - by jay
    I am trying to modularize a function that used to add values to multiple structures in one call. Now I want to do one value addition per call, but I am not sure how to make a less specific argument reference. func ( [?] *val ) { }

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  • Backslash escaping in RegularExpressionValidator

    - by frogbot
    I need to ensure that the input value contains at least one dot, so i use the following: <asp:RegularExpressionValidator runat="server" ControlToValidate="MyInput" Text="*" ErrorMessage="must contain at least one dot" ValidationExpression="\.+" /> And that doesn't work. By inspecting the page source i can see that ASP.NET escapes the backslash character so in java-script it looks like "\\.+". Why does it do so and how do i prevent RegularExpressionValidator from escaping it?

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  • Command line scripts to restore the 4 system databases of MS SQL Server 2008

    - by ciscokid
    Hi there, can someone give me some advice on how to restore the 4 system databases (master, msdb, model, tempdb) of a sql server 2008 please? I've already done some testing myself (on restoring the master database) with the following commad line script as a result: ::set variables set dbname=master set dbdirectory=C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA title Restoring %dbname% database net stop mssqlserver cd C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\Binn sqlservr -m sqlcmd -Slocalhost -E -Q "restore database master from disk='c:\master.bak' WITH REPLACE" net start mssqlserver pause After the execution of the 'sqlservr -m' command (used to start the server instance in single-user mode, which is only necessary when restoring the MASTER database), the script stops. So in order to execute the last 2 commands I need to separate the script into 2 smaller scripts, and run them one after the other. Does anyone has an idea on how I can merge them into one single script that runs completely without any interruption? I also want to restore the other 3 system databases using command line scripts like this one. Can someone please advice me how I need to go on? I've already noticed that restoring the temdb is not so easy, but there has to be a way... Looking forward to your advice!

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  • Can Box Layout accept size of included elements?

    - by Roman
    I used myPanel.setLayout(new BoxLayout(myPanel, BoxLayout.Y_AXIS)); to order panels vertically (one under another one). But myPanel defined in the shown way change the included panel. In more details, it tries to set the same hight and width for the included panels. Can it be changed? Can BoxLayout adopt size of the included elements?

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  • What is the most efficient way to determine if a directed graph is singly connected?

    - by zebraman
    I am working on an assignment where one of the problems asks to derive an algorithm to check if a directed graph G=(V,E) is singly connected (there is at most one simple path from u to v for all distinct vertices u,v of V. Of course you can brute force check it, which is what I'm doing right now, but I want to know if there's a more efficient way. Could anyone point me in the right direction?

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  • How can I Duplicate a MSSQL Symmetric Key?

    - by rlb.usa
    We have a server with a database that has a symmetric key (Database - Security - Symmetric Key). We have a backup duplicate databases that we are using as a test databases, but we don't have this key in there. How can I duplicate this symmetric key (or make a new one exactly like the old) and put it in the existing databases? It has to have the same value and key-name as the other one. This is on MS SQL Server (edit) 2008 .

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  • Tables as relations in ER diagrams

    - by Richard Mar.
    Assume I have the following tables (**bold** - primary key, *italics* - foreign key): patient(**patient_id**, name) disease(**disease_id**, name) patient_disease(**p_d_id**, *patient_id*, *disease,_id* ) I want to draw the ER diagram for this. My idea is to make two entities, one for patient and one for disease, then make a n-to-n relation between them, with p_d_id as its attribute. Is that how it's supposed to be?

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  • jsf web application with icefaces compaonent

    - by chetan
    Hello friends, I try to run one program in myeclipse where after creating one web project I added JSF and ICEFaces capability in the program. now after configuring Jboss web server when I start it I found following error. ERROR [AbstractKernelController] Error installing to Parse: name=vfsfile:/E:/ctn%20sodtware/jboss-5.0.1.GA/server/default/deploy/1aprwebapp.war/ state=Not Installed mode=Manual requiredState=Parse org.jboss.deployers.spi.DeploymentException: Error creating managed object for vfsfile:/E:/ctn%20sodtware/jboss-5.0.1.GA/server/default/deploy/1aprwebapp.war/

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  • Linux VLAN Bridge

    - by raspi
    I have home network with VLANs, one for LAN, one for WLAN and one for internet. I'd like to use bridging so that instead of configuring these same VLANs to every machine, they had own VLAN ID and bridges were LAN, WLAN and internet. I've tried it but for some reason keep-alive/ttl seems to get broken because SSH sessions etc suddenly disconnects. We have this same setup working in workplace for 4+ years with 100+ customers but it's custom firewall/router hardware so accessing it is impossible. I know that it runs Linux. So what is Debian/Ubuntu default network settings doing wrong or is it just NIC driver/hw problem? I've tried to mess araund with ttl etc settings without any luck. The bad stuff is happening in the bridge because current VLAN-only setup works fine. interfaces: auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 allow-hotplug eth1 iface eth0 inet static iface eth1 inet static auto vlan111 auto vlan222 auto vlan333 auto vlan444 auto br0 auto br1 auto br2 # LAN iface vlan111 inet static vlan_raw_device eth0 # WLAN iface vlan222 inet static vlan_raw_device eth0 # ADSL Modem iface vlan333 inet static vlan_raw_device eth1 # Internet iface vlan444 inet static vlan_raw_device eth0 # LAN bridge iface br0 inet static address 192.168.0.1 netmask 255.255.255.0 bridge_ports eth0.111 bridge_stp on # Internet bridge iface br1 inet static address x.x.x.x netmask x.x.x.x gateway x.x.x.x bridge_ports eth1.333 eth0.444 bridge_stp on post-up iptables -t nat -A POSTROUTING -o br1 -j MASQUERADE pre-down iptables -t nat -D POSTROUTING -o br1 -j MASQUERADE # WLAN bridge iface br2 inet static address 192.168.1.1 netmask 255.255.255.0 bridge_ports eth0.222 bridge_stp on Sysctl: net.ipv4.conf.default.forwarding=1

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  • Open-sourcing a mobile app

    - by hgpc
    I'm considering making one of my most popular mobile apps into an open-source project. It has an Android and iPhone version. While I have used open-source projects and submitted feature requests and bug reports, I have never created an open-source project nor contributed with a patch to an existing one. What are the top things that I should take into account before opening the source of my project? What specific steps do you recommend taking for open-sourcing a mobile app?

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  • how to go about scaling a web-application ?

    - by phoenix24
    for someone whoes been primarily a web-application developer, and know not much about scaling/scalability techniques. I'll start by stating my application is written in Python, using Django; a fairly standard setup. I currently use Apache 2.2 for my webserver, and MySql for my database server; both running on the same vps server. Up until now, it was basically a prototype and merely 15-30 concurrent users at any given time; so I had no issues, but now since we'll be adding more users we'll have severe performance issues. So my question is how do i go about scaling my web-application? and my plan is as follows. Now I have just one vps server running, apache + mysql. Next, I plan to add another vps server, to run only MySql; so i'll have one web-server and one db server. Next, I'll add Memcache to the webserver for caching data; and taking some load off mysql. Next, another web-server for serving all the static content; Next, a vps server for load-balancing (nginx/varnish) behind which would be my two web-servers and then db-server. Does that sound like a workable strategy, please guide me around here.

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  • When machine is turned on, only the fan runs

    - by Gopal
    Hi, I have an issue slightly similar to this one posted here, http://superuser.com/questions/127016/troubleshooting-monitor-never-turns-on-system-fans-running-dvd-rom-does-not-op My configuration is as follows: EPOX 9NPA+ Ultra motherboard AMD Athlon 64 CPU Corsair 2 x 1GB PC3200 DDR RAM 1 DVD RW drive and 1 CD ROM Drive SATA 250 GB Hard drive 400W Power supply EVGA 256MB graphics card I have had this configuration for about four years. Last month, I started having issues in starting the machine. It wouldn't start when I press the ON button in the front of the case. So I used to pull out the power cord and plug it back in and then switch on in the front, and it used to work fine. And then one fine day, when I plugged in the power cord at the back, even without switching on the power-on button at the front, I saw that the fan at the back was running. So I opened the system. Then I could see that all the fans inside were running. I replaced the power supply. No luck there. Then I replaced the CMOS battery. Again nothing improved. Even when I removed all the cards and memory, I still get one short beep. That's it. Any idea how to proceed on this? Anything else could be checked? I want to confirm if this is a motherboard failure, before proceeding to replace it.

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  • Instance variables vs. class variables in Python

    - by deamon
    I have Python classes, of which I need only one instance at runtime, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (what won't happen), all instance should have the same configuration. I wonder which of the following options would be better or more "idiomatic" Python. Class variables: MyController(Controller): path = "something/" childs = [AController, BController] def action(request): pass Instance ariables: MyController(Controller): def __init__(self): self.path = "something/" self.childs = [AController, BController] def action(self, request): pass

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  • How can I duplicate a SQL Server symmetric key?

    - by rlb.usa
    We have a server with a database that has a symmetric key (Database - Security - Symmetric Key). We have a backup duplicate databases that we are using as a test databases, but we don't have this key in there. How can I duplicate this symmetric key (or make a new one exactly like the old) and put it in the existing databases? It has to have the same value and key-name as the other one. This is on SQL Server 2008.

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  • how calculate the count of views?

    - by Syom
    just yesterday i finished one site, which provides video watching. but now i need to show the number of views of each film. i never wrote such thing, so i don't know what to do. maybe i must add one field in mysql database, and increase it every time the video opened? but i use flash player, and i can't wrote script onclick of player. so, could you give me an idea... thanks

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  • Base class pointer vs inherited class pointer?

    - by Goose Bumper
    Suppose I have a class Dog that inherits from a class Animal. What is the difference between these two lines of code? Animal *a = new Dog(); Dog *d = new Dog(); In one, the pointer is for the base class, and in the other, the pointer is for the derived class. But when would this distinction become important? For polymorphism, either one would work exactly the same, right?

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  • Use tab bar inconjuction with navigation bar?

    - by bipolarpants
    Hello, I'm brand new to Objective C programing for the Iphone. I was wondering if it is possible to use a tab bar, and in one of the tabs have a navigation bar so that I could drill down? I tried to look for tutorials and found this one http://www.devx.com/wireless/Article/45161/1954, I got it to work as written but I couldn't figure out to display the data I wanted. Does anyone know how? or does anyone know a tutorial for complete beginners?

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  • Unlocking a mutex from a different thread (C++)

    - by dan
    I'm using the C++ boost::thread library, which in my case means I'm using pthreads. Officially, a mutex must be unlocked from the same thread which locks it, and I want the effect of being able to lock in one thread and then unlock in another. There are many ways to accomplish this. One possibility would be to write a new mutex class which allows this behavior. For example: class inter_thread_mutex{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique_lock<boost::mutex> lck(mx); while(locked) cv.wait(lck); locked=true; } void unlock(){ { boost::lock_guard<boost::mutex> lck(mx); if(!locked) error(); locked=false; } cv.notify_one(); } // bool try_lock(); void error(); etc. } I should point out that the above code doesn't guarantee FIFO access, since if one thread calls lock() while another calls unlock(), this first thread may acquire the lock ahead of other threads which are waiting. (Come to think of it, the boost::thread documentation doesn't appear to make any explicit scheduling guarantees for either mutexes or condition variables). But let's just ignore that (and any other bugs) for now. My question is, if I decide to go this route, would I be able to use such a mutex as a model for the boost Lockable concept. For example, would anything go wrong if I use a boost::unique_lock< inter_thread_mutex for RAII-style access, and then pass this lock to boost::condition_variable_any.wait(), etc. On one hand I don't see why not. On the other hand, "I don't see why not" is usually a very bad way of determining whether something will work. The reason I ask is that if it turns out that I have to write wrapper classes for RAII locks and condition variables and whatever else, then I'd rather just find some other way to achieve the same effect.

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  • outofmemory error for Windows 2008 server(64 bit) and JBOSS 5.0.1,64bit jvm

    - by Amar dhole
    Hi All, I have ear deployed in jboss 5.0.1, on windows 2008 which is 64 bit machine and we are using 64jvm, with this combination our VFS temp size increases a lot eventually all our physical hard drive space is used by replicating files. but if we change our JVm from 64 to 32 every thing looks ok. does any one one what is reason ?and possible solution as we want ot use 64bit jvm. Thanks

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