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  • INSERT DELAYED on locked tables blocks PHP processes to continue

    - by sw0x2A
    Our webservers write some tracking information into a MySQL database (using INSERT DELAYED into MyISAM table). When a huge SELECT query is executed on this table or when it is locked for another reason, the webserver processes (with INSERT DELAYED) are waiting for the database and in some cases the MaxServer limit is reached in Apaches, so they will stop serving requests. We use INSERT DELAYED because The DELAYED option for the INSERT statement is a MySQL extension to standard SQL that is very useful if you have clients that cannot or need not wait for the INSERT to complete. This is a common situation when you use MySQL for logging and you also periodically run SELECT and UPDATE statements that take a long time to complete. Quote from MySQL documentation. I am wondering why the Apache processes are waiting for the INSERT DELAYED to finish. And what can I do to just send the data and forget about it. (Since this is logging data, I do not care if we lose some entries.) Even when the table is locked the PHP script should just go on and should not wait for an answer of MySQL. (We do not want to setup Master-slave for this table but we are thinking about move this data to some NoSQL database. But for now I would like to know why INSERT DELAYED is not working as expected.)

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  • How can I determine the IP addresses allocated by DHCP on a router that I'm connected to?

    - by user234831
    This "router" is not a typical situation. I'm using my phone as a hotspot and can only configure a select number of DHCP options. I can manage the limit on how many devices/clients can use my phone as a hotspot. I have to select from a radio-button list with the options: 2,3,4,5, or 8 I can specify the DHCP starting IP address. In this case, it begins at 192.168.6.106 When I'm connected via WIFI to my phone, an ipconfig /all command shows me that the default gateway is 192.168.6.1 and my IPv4 address is 192.168.1.148. I have the luxury of connecting another device to the phone and that device was assigned 192.168.1.121. I've tried connecting to 192.168.6.1, hoping for some sort of router setup page that I'm used to seeing, but there is no such thing or maybe it's just a matter of incompatable operating systems. In summary, the "router" (phone) has an IP address of 192.168.6.1 and a DHCP server that begins at 192.168.6.106 and allows up to 8 connections. Normally, I would assume a range of 192.168.6.106 - 192.168.6.113, but connected clients are showing otherwise. How can I figure out which IP addresses are set aside by DHCP for clients?

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  • Portforwarding Combine Several Ports

    - by kiraitachi
    Hi I got a Raspberry Pi at A.A.A.B in my local network and I have set up a DMZ on my router so that any incoming traffic that comes to my router gets redirected to my raspberry pi wich I can connect via NO-IP adress. The problem is that I want to set up portforwarding since i got several services running on my Pi like SSH, torrent webgui, webalbum, etc. I had this already done before long time ago, but I forgot a bit the syntax and cant get to set it up. Router Help says: The Application allows you to do port forwarding, but only have the ports open when data flowing out of the trigger ports. When a program sends data out on outgoing ports called trigger ports, the device then allows incoming data on the open ports specified in your port triggering configuration. 1.Trigger Port Start Trigger Port Start Specify the start port on the device that would trigger the device to open ports for incoming data. 2.Trigger Port End Specify the end port on the device that would trigger the device to open ports for incoming data. You can enter a port number the same as the trigger port start or enter a larger port number to specify a port range. 3.Trigger Traffic Protocol Type Select the trigger traffic type. Open Port Specify all the ports to be opened. It's content could be: A single port only. A port range only. Start open port number and end port number should be separated by "-" . Combined several single port and several port ranges. Each single port or port range should be separated by "," . Open Traffic Protocol Type Select the open traffic type. This are the fields: http://es.tinypic.com/view.php?pic=n5lv1k&s=8 I think this is the syntax 1-7999,8001-9090,9092-65535. But each time I want to add it gives me an error. Any ideas?

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  • Dual boot Windows 8 and Ubuntu 12.10 across a reboot

    - by AK4749
    My Setup: I have two separate SSDs, and each contains an independently bootable OS - W8 and U12.10. From my extremely limited knowledge, this means each has a functioning EFI partition(?). My default boot order (GA-Z68XP-UD3P mobo with UEFI firmware update) boots the UEFI partition containing windows first, but if I enter the BIOS I can select the "ubuntu" entry to successfully boot ubuntu. Both drives are GPT, and are EFI boots. What I want to do: Reboot Windows 8, re-enter W8 (this is happening now due to the default boot order). What I want to change, however, is to boot into Ubuntu if i reboot from ubuntu. Essentially, I would like to work within one OS unless I consciously choose otherwise. Normally, I would not even ask to something I thought was impossible, but... Why I think this is possible: When trying EasyBCD to add ubuntu to the W8 UEFI bootloader, I noticed an "iReboot" addon or something that allows you to select which OS to boot into from within the OS. Note that I ended up not using the NeoGrub entry to chain Ubuntu off the W8 bootloader because I couldn't get much help with it. Is this possible? Have I had too much coffee and gone insane? Thank you all for your time, AK

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  • Change the background color of selected text in Google Docs to increase readability [migrated]

    - by gene_wood
    How can I override or change the background color of text selected in Google Docs? It is difficult for me to see the difference and I would like to increase the contrast or difference. After Google restyled Google Docs last year (or earlier this year), I've been unable to see selected text. It's possible this is a visual deficiency with my eyes. In Google Docs, under both Google Chrome (17.0.963.83 (Official Build 127885) m) and Firefox (11.0), when I select text inside a Google Doc, the selected text has a background of color #d6e0f5. Compare this to the default browser background color of #2f65c0. (I determined the color of the selected text background by taking a screenshot and using the color picker tool in Photoshop). I've tested this using a brand new Firefox profile as well as google chrome profile. Here's a section of a screenshot showing the selected text : I've tried using a userscript to override the CSS to go back to the default text selection color using the "Stylish" plugin with this css : ::selection { background:#2f65c0; color:#ffffff; } ::-moz-selection { background:#2f65c0; color:#ffffff; } ::-webkit-selection { background:#2f65c0; color:#ffffff; } This code works on other sites, but I'm unable to get it to work on Google Docs. (I tested on other sites but applying the userscript to a different domain and using bright yellow instead of the default dark blue #2f65c0.) When you use Google Docs, do you have the same color background for selected text or something different? (To test this, browse to docs.google.com , create a document, type text into the document, select the text with the mouse by dragging over it, take a screenshot, load the screenshot up in an image editor and determine the background color of the selected text.) This color differential (between light blue #d6e0f5 and white #fffff) may be easy to see for others and the problem lies with my eyes.

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  • How to optimize a postgreSQL server for a "write once, read many"-type infrastructure ?

    - by mhu
    Greetings, I am working on a piece of software that logs entries (and related tagging) in a PostgreSQL database for storage and retrieval. We never update any data once it has been inserted; we might remove it when the entry gets too old, but this is done at most once a day. Stored entries can be retrieved by users. The insertion of new entries can happen rather fast and regularly, thus the database will commonly hold several millions elements. The tables used are pretty simple : one table for ids, raw content and insertion date; and one table storing tags and their values associated to an id. User search mostly concern tags values, so SELECTs usually consist of JOIN queries on ids on the two tables. To sum it up : 2 tables Lots of INSERT no UPDATE some DELETE, once a day at most some user-generated SELECT with JOIN huge data set What would an optimal server configuration (software and hardware, I assume for example that RAID10 could help) be for my PostgreSQL server, given these requirements ? By optimal, I mean one that allows SELECT queries taking a reasonably little amount of time. I can provide more information about the current setup (like tables, indexes ...) if needed.

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  • Creating bootable Fedora USB with persistent storage

    - by dooffas
    I am attempting to burn the full Fedora 19 x86_64 DVD iso to a USB drive and have a separate partition on it for a kickstart file / other media that will be installed in the kickstart process. With the Ubuntu server 12 iso, you can simply dd the iso to the usb drive: dd if=/path/to/iso of=/dev/sdb Once the iso has been burnt, open gparted and create a ext2 parition in the allocated space. However, this does not seem to work with the Fedora ISO. When loading the USB drive in gparted I get a warning and an error: Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes. Error: The partition's data region doesn't occupy the entire partition. Ignoring both of these errors allows gparted to load the usb drive, however it shows a blank drive with no partition table. Has anyone come across this before? From what I have found, it may have something to do with the fact that Fedora use isohybrid.

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  • Linux Firefox copy/paste issue

    - by Daniel
    I'm using Firefox 15.0.1 on Fedora 17 without running gnome or kde. The problem I'm having is that whenever I select text outside of Firefox, for instance in xterm, the middle mouse button doesn't copy it inside Firefox, for instance in a text area, but rather brings up a context menu. A related problem is that whenever I middle click inside Firefox, for instance in a text input, the middle mouse button brings up a menu when I'd like it to paste. Even if I select Paste in the menu not the selected text (from outside Firefox) gets pasted but the last selected text inside Firefox. In about:config I tried "middlemouse.paste true" and also "middlemouse.paste false" together with the add-on Auto Copy but no combination worked. A middle mouse click always brings up a context menu. But the Auto Copy did help with automatically copying selected text to the clipboard. With Auto Copy the only problem I still have is pasting by middle button. Follow up: somehow the problem solved itself. After removing Auto Copy firefox works as I expect it to (as any X application). I can't figure out why it was not doing it before, probably I was messing too much with about:config and not restarting frequently enough.

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  • How can I stop outlook 2003 from crashing?

    - by Xavierjazz
    XP Outlook 2003 keeps crashing, sometimes freezing my whole computer. The STR: Have Outlook 2003 running (with the added "app" LOOKOUT for search and a pop mail as well as MS mail set up. The program loads and displays my reminders. I minimize the reminders. Outlook displays my email list. I have the "Reading pane" set to display right. There is often junk in my junk folder. When I click on the MS mail junk folder, there is sometimes junk with a blank description. Clicking on this to select and delete it is when the program is virtually certain to crash. Often when I reboot the program, the reading pane is again reset to the default, which is "no reading pane". If I change it back and then again click on the message the program often crashes. If I don't set the reading pane but select the message(s), they can be selected and removed. I then set the reading pane and things are okay for a period. This has been going on for some time now. As a part of trying to solve it, I did a deep scan with a number of "root kit" virus-removers. One did find 2 related root kit viruses and removed them. Ram seems okay, HDD shows okay. As I write this I realize that one thing I haven't tried is removing and re-installing LOOKOUT. I will do that now. Any other ideas or even better, solutions, would be most welcome.

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  • How to avoid en.voyages-sncf.com redirecting to uk.voyages-sncf.com?

    - by Mark Smith
    OK, so en.voyages-sncf.com is French Railways' English language website with full functionality for train booking in France - it sells iDTGV, offers seating options etc. uk.voyages-sncf.com is their UK subsidiary, with reduced functionality, no seat options, no iDTGV etc. Previously, I have been able to select 'Other countries (EUR)' top right and go from the uk version to the en version, or just type in the direct url 'en.voyages-sncf.com and go there. Now, they seem to have implemented an automatic redirect so whenever I enter 'en.voyages-sncf.com' on my UK-based PC or indeed try to select 'Other countries (EUR)' it automatically bumps me to uk.voyages-sncf.com, which I don't want. I can't get onto en.voyages-sncf at all. So, short of using a heavyweight solution like using a non-UK proxy server or downloading the TOR browser, is there any simple solution? Like telling my browser to go to en.voyages-sncf, go directly to en.voyages-sncf and no other site, do not pass go, do not collect £200, do not go anywhere else, ignore all redirects and do what you're told by ME, not by those Machiavellian so-and-sos?

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  • Formatting not retained in paste from Ditto (clipboard manager). Plain text pasted instead [Solved] Add supported types

    - by Jeff Kang
    I'm trying to use Ditto on the Ditto documentation. If I were to copy the table of contents, then paste it (without Ditto) to the word processor, I get http://i.imgur.com/V1GU3.png, and the formatting is maintained. As as a result of the copy operation, the table of contents also goes into the Saved Items List (= History List = Lists the Clips saved from the Clipboard) in Ditto’s Main Window: I open a blank document to paste from Ditto instead of the default clipboard, and press either Ctrl-`, the default Ditto window activation Global Hot Key, or click the tray icon. From this point, I can do 3 things to close the Ditto window, and place the item on the clipboard (the default clipboard?). Select the item, and press Enter Put the cursor on the item, and double-click Select the item, and press Ctrl-c 1) and 2) send a right-click where the cursor is, after the Ditto window closes (presumably to have the paste option ready to access?): Ctrl-c just closes the Ditto window. Whichever method is used, the contents are pasted in what I believe is plain text: http://i.imgur.com/mQAZH.png How do I keep the formatting that the default clipboard keeps? Thanks.

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  • Linux: how to "zoom" into a screen area à la Mac OS X?

    - by puccio
    It seems to me on Mac OS X it is possible to "zoom" (like a photocamera does) into a region of the screen. It is handy for example to put at full monitor size a video which would otherwise be limited to be just into a small window (ie. embedded in a web page and not watchable standalone.), obviously losing some quality due to the "zoom". Do you know of any tool or way to do the same thing on a Linux desktop (with Gnome as desktop manager if it is desktop manager dependant). Thanks in advance for any suggestion.

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  • VirtualBox bridged network not working as expected

    - by iby chenko
    I am having hard time getting Bridged network to work with VirtualBox. Idea is to have host as well as one or more guests on same LAN. Using NAT (default) I do get access to internet and any node on the LAN when working from one of the VM guests. However, no LAN node including host can access (or ping) guest in VM. I need to be able to use any guest as if it was a physical computer on the network (need to be accessed by any machine on LAN). According to my understanding of the VirtualBox documentation, this should be Bridged mode. I think I set it correctly, well, actually there is not much to it: 1. select Bridged mode in VM network setup 2. select physical NIC of the host to connect bridge to 3. start VM When I do this, each VM does get new IP address that corresponds to LAN settings : 192.168.1.100 192.168.1.102 192.168.1.103 etc. where host is 192.168.1.80 / 255.255.255.0 (IP addresses above 100 are served by DHCP server). This seem to be correct based on what I know about ethernet. From VM I can ping other nodes like 192.168.1.50 etc. and I still get ethernet access. So far so good... But I STILL cannot ping any of the other VMs (running ones of course). I cannot ping them from other VMs, from host or from other nodes on the LAN. Aside from fact that IP addresses handed to guests are now local, this still acts same as NAT. What is going on? What am I missing? Regards, I

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  • Hosting company that does Linux VPS and MS SQL

    - by danielmcq
    I'm looking for hosted solutions but there are so many companies that finding the right one using a Google search is a bit overwhelming. Ideally I would like a hosting company which has following options: -Linux VPSs - Individual VPSs should be fairly cheap since I plan on putting one or two services per VPS i.e web server on one (httpd and ColdFusion), an SVN server on another, etc. -Managed MS SQL databases - My company already has data in MS SQL databases and a lot of ColdFusion code written that has MS SQL specific commands in it. -Individually purchased dedicated IP addresses -Preferably located in the North America region My plan would be to setup one Linux VPS as a gateway/firewall/VPN server and have all of my traffic routed through so that my other servers would not use of bandwidth by talking to each other. The trick is also finding a company that does Linux VPS AND MS SQL databases. Does anybody know of any hosting companies offer what I'm looking for? Let me know if I need to add more details.

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  • Shell script to block proftp failled attempt

    - by Saif
    Hello, I want to filter and block failed attempt to access my proftp server. Here is an example line from the /var/log/secure file: Jan 2 18:38:25 server1 proftpd[17847]: spy1.XYZ.com (93.218.93.95[93.218.93.95]) - Maximum login attempts (3) exceeded There are several lines like this. I would like to block any attempts like this from any IP twice. Here's a script I'm trying to run to block those IPs. tail -1000 /var/log/secure | awk '/proftpd/ && /Maximum login/ { if (/attempts/) try[$7]++; else try[$11]++; } END { for (h in try) if (try[h] > 4) print h; }' | while read ip do /sbin/iptables -L -n | grep $ip > /dev/null if [ $? -eq 0 ] ; then # echo "already denied ip: [$ip]" ; true else logger -p authpriv.notice "*** Blocking ProFTPD attempt from: $ip" /sbin/iptables -I INPUT -s $ip -j DROP fi done how can I select the IP with "awk". with the current script it's selecting "(93.218.93.95[93.218.93.95])" this line completely. But i only want to select the IP.

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  • Cannot connect to a shared network drive

    - by dublintech
    I am using windows 7, I cannot connect to a shared network drive on another machine. I can ping the machine. I can remote desktop connect to the machine. The machine is on the same subnet My friend with the exact same laptop as me (and on the same network, same workgroup) can connect to the shared folder. The machine I am trying to connect to and my friends machine can both see shared folders on my machine. I also cannot see shared folders on the friends laptop. When I select diagnose, windows tells me nothing useful. When I select see details on the error pop up, I see: Error code: 0x80004005 (google doesn't help much) I can nbtstat -a the machine who has the shared folder. When I try with my firewall turned off the same happens. I have ensured my windows 7 has all updates. I run security essentials to ensure my laptop is clean. I run ccleaner to clean up my registry. Same error. I have tried with my laptop on both wireless and ethernet. As you can imagine, I am banging my head against the wall on this one.

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  • Windows 7 Shortdate Format Ignored

    - by Element
    I am moving a copy of an ASP.net web application running on a windows server 2003 box to a Windows 7 Laptop. On the win server 2003 box the locale was set to United States and shortdate format was M/DD/YYYY. On the Windows 7 machine it is DD/MM/YYYY which is breaking the application. I have tried changing all the locale settings under controlpanel-regions to United States and rebooting with no luck. I also tried explcitly setting the shortdate format to M/DD/YYYY under the region settings but the web application seems to ignore it. How can I change the Windows 7 shortdate format so an ASP.net application will recognize it ?

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  • Remote additional domain controllers

    - by user125248
    Is it possible to setup several additional domain controllers (ADC) at remote locations that are connected via medium bandwidth DSL (2-10 Mbit) WAN connections for a single domain (intranet.example.com)? And would it be a good idea? We have five sites and would like to have extremely high availability if any of the site were to lose their Internet connection. However each site is very small, and all are over a fairly small geographical area within the same region, so it would seem strange to have a PDC for each of the sites. If it were possible to have an ADC for each site, would the clients use the ADC or just use the PDC if it's available to them?

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  • WCF security via message headers

    - by exalted
    I'm trying to implement "some sort of" server-client & zero-config security for some WCF service. The best (as well as easiest to me) solution that I found on www is the one described at http://www.dotnetjack.com/post/Automate-passing-valuable-information-in-WCF-headers.aspx (client-side) and http://www.dotnetjack.com/post/Processing-custom-WCF-header-values-at-server-side.aspx (corrisponding server-side). Below is my implementation for RequestAuth (descibed in the first link above): using System; using System.Diagnostics; using System.ServiceModel; using System.ServiceModel.Configuration; using System.ServiceModel.Dispatcher; using System.ServiceModel.Description; using System.ServiceModel.Channels; namespace AuthLibrary { /// <summary> /// Ref: http://www.dotnetjack.com/post/Automate-passing-valuable-information-in-WCF-headers.aspx /// </summary> public class RequestAuth : BehaviorExtensionElement, IClientMessageInspector, IEndpointBehavior { [DebuggerBrowsable(DebuggerBrowsableState.Never)] private string headerName = "AuthKey"; [DebuggerBrowsable(DebuggerBrowsableState.Never)] private string headerNamespace = "http://some.url"; public override Type BehaviorType { get { return typeof(RequestAuth); } } protected override object CreateBehavior() { return new RequestAuth(); } #region IClientMessageInspector Members // Keeping in mind that I am SENDING something to the server, // I only need to implement the BeforeSendRequest method public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState) { throw new NotImplementedException(); } public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel) { MessageHeader<string> header = new MessageHeader<string>(); header.Actor = "Anyone"; header.Content = "TopSecretKey"; //Creating an untyped header to add to the WCF context MessageHeader unTypedHeader = header.GetUntypedHeader(headerName, headerNamespace); //Add the header to the current request request.Headers.Add(unTypedHeader); return null; } #endregion #region IEndpointBehavior Members public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters) { throw new NotImplementedException(); } public void ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime) { clientRuntime.MessageInspectors.Add(this); } public void ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher) { throw new NotImplementedException(); } public void Validate(ServiceEndpoint endpoint) { throw new NotImplementedException(); } #endregion } } So first I put this code in my client WinForms application, but then I had problems signing it, because I had to sign also all third-party references eventhough http://msdn.microsoft.com/en-us/library/h4fa028b(v=VS.80).aspx at section "What Should Not Be Strong-Named" states: In general, you should avoid strong-naming application EXE assemblies. A strongly named application or component cannot reference a weak-named component, so strong-naming an EXE prevents the EXE from referencing weak-named DLLs that are deployed with the application. For this reason, the Visual Studio project system does not strong-name application EXEs. Instead, it strong-names the Application manifest, which internally points to the weak-named application EXE. I expected VS to avoid this problem, but I had no luck there, it complained about all the unsigned references, so I created a separate "WCF Service Library" project inside my solution containing only code above and signed that one. At this point entire solution compiled just okay. And here's my problem: When I fired up "WCF Service Configuration Editor" I was able to add new behavior element extension (say "AuthExtension"), but then when I tried to add that extension to my end point behavior it gives me: Exception has been thrown by the target of an invocation. So I'm stuck here. Any ideas?

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  • How to expose service contract interfaces with multiple inheritance in WCF service on single endpoin

    - by Vaibhav Gawali
    I have only simple data types in method signature of service (such as int, string). My service class implements single ServiceContract interface say IMathService, and this interface in turn inherits from some other base interface say IAdderService. I want to expose the MathService using interface contract IAdderService as a service on a single endpoint. However some of the clinet's which know about IMathService should be able to access the extra services provided by IMathService on that single endpoint i.e. by just typecasting IAdderService to IMathService. //Interfaces and classes at server side [ServiceContract] public interface IAdderService { [OperationContract] int Add(int num1, int num2); } [ServiceContract] public interface IMathService : IAdderService { [OperationContract] int Substract(int num1, int num2); } public class MathService : IMathService { #region IMathService Members public int Substract(int num1, int num2) { return num1 - num2; } #endregion #region IAdderService Members public int Add(int num1, int num2) { return num1 + num2; } #endregion } //Run WCF service as a singleton instace MathService mathService = new MathService(); ServiceHost host = new ServiceHost(mathService); host.Open(); Server side Configuration: <configuration> <system.serviceModel> <services> <service name="IAdderService" behaviorConfiguration="AdderServiceServiceBehavior"> <endpoint address="net.pipe://localhost/AdderService" binding="netNamedPipeBinding" bindingConfiguration="Binding1" contract="TestApp.IAdderService" /> <endpoint address="mex" binding="mexNamedPipeBinding" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="net.pipe://localhost/AdderService"/> </baseAddresses> </host> </service> </services> <bindings> <netNamedPipeBinding> <binding name="Binding1" > <security mode = "None"> </security> </binding > </netNamedPipeBinding> </bindings> <behaviors> <serviceBehaviors> <behavior name="AdderServiceServiceBehavior"> <serviceMetadata /> <serviceDebug includeExceptionDetailInFaults="True" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> Client Side imeplementation: IAdderService adderService = new ChannelFactory<IAdderService>("AdderService").CreateChannel(); int result = adderService.Add(10, 11); IMathService mathService = adderService as IMathService; result = mathService.Substract(100, 9); Client side configuration: <configuration> <system.serviceModel> <client> <endpoint name="AdderService" address="net.pipe://localhost/AdderService" binding="netNamedPipeBinding" bindingConfiguration="Binding1" contract="TestApp.IAdderService" /> </client> <bindings> <netNamedPipeBinding> <binding name="Binding1" maxBufferSize="65536" maxConnections="10"> <security mode = "None"> </security> </binding > </netNamedPipeBinding> </bindings> </system.serviceModel> </configuration> Using above code and configuration I am not able to typecast IAdderService instnace to IMathService, it fails and I get null instance of IMathService at client side. My observation is if server exposes IMathService to client then client can safely typecast to IAdderService and vice versa is also possible. However if server exposes IAdderService then the typecast fails. Is there any solution to this? or am I doing it in a wrong way.

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  • Is it possible to specify a generic constraint for a type parameter to be convertible FROM another t

    - by fostandy
    Suppose I write a library with the following: public class Bar { /* ... */ } public class SomeWeirdClass<T> where T : ??? { public T BarMaker(Bar b) { // ... play with b T t = (T)b return (T) b; } } Later, I expect users to use my library by defining their own types which are convertible to Bar and using the SomeWeirdClass 'factory'. public class Foo { public static explicit operator Foo(Bar f) { return new Bar(); } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } this will compile if i set where T : Foo but the problem is that I don't know about Foo at the library's compile time, and I actually want something more like where T : some class that can be instantiated, given a Bar Is this possible? From my limited knowledge it does not seem to be, but the ingenuity of the .NET framework and its users always surprises me... This may or not be related to the idea of static interface methods - at least, I can see the value in being able to specify the presence of factory methods to create objects (similar to the same way that you can already perform where T : new()) edit: Solution - thanks to Nick and bzIm - For other readers I'll provide a completed solution as I understand it: edit2: This solution requires Foo to expose a public default constructor. For an even stupider better solution that does not require this see the very bottom of this post. public class Bar {} public class SomeWeirdClass<T> where T : IConvertibleFromBar<T>, new() { public T BarMaker(Bar b) { T t = new T(); t.Convert(b); return t; } } public interface IConvertibleFromBar<T> { T Convert(Bar b); } public class Foo : IConvertibleFromBar<Foo> { public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } edit2: Solution 2: Create a type convertor factory to use: #region library defined code public class Bar {} public class SomeWeirdClass<T, TFactory> where TFactory : IConvertorFactory<Bar, T>, new() { private static TFactory convertor = new TFactory(); public T BarMaker(Bar b) { return convertor.Convert(b); } } public interface IConvertorFactory<TFrom, TTo> { TTo Convert(TFrom from); } #endregion #region user defined code public class BarToFooConvertor : IConvertorFactory<Bar, Foo> { public Foo Convert(Bar from) { return (Foo) from; } } public class Foo { public Foo(int a) {} public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } #endregion public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo, BarToFooConvertor> weird = new SomeWeirdClass<Foo, BarToFooConvertor>(); Foo f = weird.BarMaker(b); } }

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  • Is it possible to specify a generic constraint for a type parameter to be convertible FROM another t

    - by fostandy
    Suppose I write a library with the following: public class Bar { /* ... */ } public class SomeWeirdClass<T> where T : ??? { public T BarMaker(Bar b) { // ... play with b T t = (T)b return (T) b; } } Later, I expect users to use my library by defining their own types which are convertible to Bar and using the SomeWeirdClass 'factory'. public class Foo { public static explicit operator Foo(Bar f) { return new Bar(); } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } this will compile if i set where T : Foo but the problem is that I don't know about Foo at the library's compile time, and I actually want something more like where T : some class that can be instantiated, given a Bar Is this possible? From my limited knowledge it does not seem to be, but the ingenuity of the .NET framework and its users always surprises me... This may or not be related to the idea of static interface methods - at least, I can see the value in being able to specify the presence of factory methods to create objects (similar to the same way that you can already perform where T : new()) edit: Solution - thanks to Nick and bzIm - For other readers I'll provide a completed solution as I understand it: edit2: This solution requires Foo to expose a public default constructor. For an even stupider better solution that does not require this see the very bottom of this post. public class Bar {} public class SomeWeirdClass<T> where T : IConvertibleFromBar<T>, new() { public T BarMaker(Bar b) { T t = new T(); t.Convert(b); return t; } } public interface IConvertibleFromBar<T> { T Convert(Bar b); } public class Foo : IConvertibleFromBar<Foo> { public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo> weird = new SomeWeirdClass<Foo>(); Foo f = weird.BarMaker(b); } } edit2: Solution 2: Create a type convertor factory to use: #region library defined code public class Bar {} public class SomeWeirdClass<T, TFactory> where TFactory : IConvertorFactory<Bar, T>, new() { private static TFactory convertor = new TFactory(); public T BarMaker(Bar b) { return convertor.Convert(b); } } public interface IConvertorFactory<TFrom, TTo> { TTo Convert(TFrom from); } #endregion #region user defined code public class BarToFooConvertor : IConvertorFactory<Bar, Foo> { public Foo Convert(Bar from) { return (Foo) from; } } public class Foo { public Foo(int a) {} public static explicit operator Foo(Bar f) { return null; } public Foo Convert(Bar b) { return (Foo) b; } } #endregion public class Demo { public static void demo() { Bar b = new Bar(); SomeWeirdClass<Foo, BarToFooConvertor> weird = new SomeWeirdClass<Foo, BarToFooConvertor>(); Foo f = weird.BarMaker(b); } }

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  • drupal - using variable_set, hook block and hook menu to save config values then print out in custom

    - by bert
    I am trying to 1) implement the hook menu and variable_set in the block hook and to solicit and store configuration values from user, 2) then use retrieve configuration values and 3) pass them out into a template using theme hook when page is shown. However I need a bit of a push on step two and three! // ===================== file: my_module.php function my_module_block($op = 'list', $delta = 0, $edit = array()) { switch($op) { case 'list': $blocks[0] = array( 'info' => t('Find Something'), // required value - this shows up in your list of blocks 'region' => 'left', // default region on the page 'weight' => 0, // position the block vertically within its column. 'visibility' => 1, // permit the block to be displayed for a given user. 'status' => TRUE, // enabled ); return $blocks; break; // case configure case 'configure': // not used ? // case save (save configuration values) case 'save': variable_set('my_module_text_bottom', $edit['my_module_text_bottom']); variable_set('my_module_text_top', $edit['my_module_text_top']); break; } } function my_module_menu(){ $items = array(); // add menu items $items['my_module'] = array( // add a menu item here... ); // administration setting - callback my_module_admin $items['admin/settings/my_module'] = array( 'title' => 'Lookup on Something', 'description' => 'Description of my module settings page', 'page callback' => 'drupal_get_form', 'page arguments' => array('my_module_admin'), 'access arguments' => array('access administration pages'), 'type' => MENU_NORMAL_ITEM, ); return $items; } // setup administrative default values (see: site configiration) function my_module_admin() { $form = array(); $form['my_module_text_top'] = array( '#type' => 'textarea', '#title' => t('Text of top of page'), '#default_value' => variable_get('my_module_text_top', 'my_module_text_top: This is configurable text found in the module configuration.'), '#size' => 1024, '#maxlength' => 1024, '#description' => t("text above the Find a Retailer block."), '#required' => TRUE, ); $form['my_module_text_bottom'] = array( '#type' => 'textarea', '#title' => t('Text at bottom of page'), '#default_value' => variable_get('my_module_text_bottom', 'my_module_text_bottom: This is configurable text found in the module configuration.'), '#size' => 1024, '#maxlength' => 1024, '#description' => t("text below the Find a Retailer block."), '#required' => TRUE, ); return system_settings_form($form); } // registering a theme function my_module_theme(){ return array( 'my_module_show' => array( 'arguments' => array('content' => "hello"), 'template' => 'my_module_show' ), ); } // implementing a theme function theme_my_module_show($content){ $output = '<ul>$content</ul>'; return $output; } function my_module(){ $output = ''; $variables = ""; $output .= theme('my_module_show', $variables); return $output; } // ===================== file: my_module_show.tpl.php print $text1; print $text2;

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  • Simple C# CSV Excel export class

    - by Chris
    Thought this might be handy for someone, this is an extremely simple CSV export class that I needed. Features: Extremely simple to use Escapes commas and quotes so excel handles them fine Exports date and datetimes in timezone-proof format Without further ado: using System; using System.Data.SqlTypes; using System.IO; using System.Text; using System.Collections.Generic; /// <summary> /// Simple CSV export /// Example: /// CsvExport myExport = new CsvExport(); /// /// myExport.AddRow(); /// myExport["Region"] = "New York, USA"; /// myExport["Sales"] = 100000; /// myExport["Date Opened"] = new DateTime(2003, 12, 31); /// /// myExport.AddRow(); /// myExport["Region"] = "Sydney \"in\" Australia"; /// myExport["Sales"] = 50000; /// myExport["Date Opened"] = new DateTime(2005, 1, 1, 9, 30, 0); /// /// Then you can do any of the following three output options: /// string myCsv = myExport.Export(); /// myExport.ExportToFile("Somefile.csv"); /// byte[] myCsvData = myExport.ExportToBytes(); /// </summary> public class CsvExport { /// <summary> /// To keep the ordered list of column names /// </summary> List<string> fields = new List<string>(); /// <summary> /// The list of rows /// </summary> List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>(); /// <summary> /// The current row /// </summary> Dictionary<string, object> currentRow { get { return rows[rows.Count - 1]; } } /// <summary> /// Set a value on this column /// </summary> public object this[string field] { set { // Keep track of the field names, because the dictionary loses the ordering if (!fields.Contains(field)) fields.Add(field); currentRow[field] = value; } } /// <summary> /// Call this before setting any fields on a row /// </summary> public void AddRow() { rows.Add(new Dictionary<string, object>()); } /// <summary> /// Converts a value to how it should output in a csv file /// If it has a comma, it needs surrounding with double quotes /// Eg Sydney, Australia -> "Sydney, Australia" /// Also if it contains any double quotes ("), then they need to be replaced with quad quotes[sic] ("") /// Eg "Dangerous Dan" McGrew -> """Dangerous Dan"" McGrew" /// </summary> string MakeValueCsvFriendly(object value) { if (value == null) return ""; if (value is INullable && ((INullable)value).IsNull) return ""; if (value is DateTime) { if (((DateTime)value).TimeOfDay.TotalSeconds==0) return ((DateTime)value).ToString("yyyy-MM-dd"); return ((DateTime)value).ToString("yyyy-MM-dd HH:mm:ss"); } string output = value.ToString(); if (output.Contains(",") || output.Contains("\"")) output = '"' + output.Replace("\"", "\"\"") + '"'; return output; } /// <summary> /// Output all rows as a CSV returning a string /// </summary> public string Export() { StringBuilder sb = new StringBuilder(); // The header foreach (string field in fields) sb.Append(field).Append(","); sb.AppendLine(); // The rows foreach (Dictionary<string, object> row in rows) { foreach (string field in fields) sb.Append(MakeValueCsvFriendly(row[field])).Append(","); sb.AppendLine(); } return sb.ToString(); } /// <summary> /// Exports to a file /// </summary> public void ExportToFile(string path) { File.WriteAllText(path, Export()); } /// <summary> /// Exports as raw UTF8 bytes /// </summary> public byte[] ExportToBytes() { return Encoding.UTF8.GetBytes(Export()); } }

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  • Issue allowing custom Xml Serialization/Deserialization on certain types of field

    - by sw1sh
    I've been working with Xml Serialization/Deserialization in .net and wanted a method where the serialization/deserialization process would only be applied to certain parts of an Xml fragment. This is so I can keep certain parts of the fragment in Xml after the deserialization process. To do this I thought it would be best to create a new class (XmlLiteral) that implemented IXmlSerializable and then wrote specific code for handling the IXmlSerializable.ReadXml and IXmlSerializable.WriteXml methods. In my example below this works for Serializing, however during the Deserialization process it fails to run for multiple uses of my XmlLiteral class. In my example below sTest1 gets populated correctly, but sTest2 and sTest3 are empty. I'm guessing I must be going wrong with the following lines but can't figure out why.. Any ideas at all? Private Sub ReadXml(ByVal reader As System.Xml.XmlReader) Implements IXmlSerializable.ReadXml Dim StringType As String = "" If reader.IsEmptyElement OrElse reader.Read() = False Then Exit Sub End If _src = reader.ReadOuterXml() End Sub Full listing: Imports System Imports System.Xml.Serialization Imports System.Xml Imports System.IO Imports System.Text Public Class XmlLiteralExample Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load Dim MyObjectInstance As New MyObject MyObjectInstance.aProperty = "MyValue" MyObjectInstance.XmlLiteral1 = New XmlLiteral("<test1>Some Value</test1>") MyObjectInstance.XmlLiteral2 = New XmlLiteral("<test2>Some Value</test2>") MyObjectInstance.XmlLiteral3 = New XmlLiteral("<test3>Some Value</test3>") ' quickly serialize the object to Xml Dim sw As New StringWriter(New StringBuilder()) Dim s As New XmlSerializer(MyObjectInstance.[GetType]()), xmlnsEmpty As New XmlSerializerNamespaces xmlnsEmpty.Add("", "") s.Serialize(sw, MyObjectInstance, xmlnsEmpty) Dim XElement As XElement = XElement.Parse(sw.ToString()) ' XElement reads as the following, so serialization works OK '<MyObject> ' <aProperty>MyValue</aProperty> ' <XmlLiteral1> ' <test1>Some Value</test1> ' </XmlLiteral1> ' <XmlLiteral2> ' <test2>Some Value</test2> ' </XmlLiteral2> ' <XmlLiteral3> ' <test3>Some Value</test3> ' </XmlLiteral3> '</MyObject> ' quickly deserialize the object back to an instance of MyObjectInstance2 Dim MyObjectInstance2 As New MyObject Dim xmlReader As XmlReader, x As XmlSerializer xmlReader = XElement.CreateReader x = New XmlSerializer(MyObjectInstance2.GetType()) MyObjectInstance2 = x.Deserialize(xmlReader) Dim sProperty As String = MyObjectInstance2.aProperty ' equal to "MyValue" Dim sTest1 As String = MyObjectInstance2.XmlLiteral1.Text ' contains <test1>Some Value</test1> Dim sTest2 As String = MyObjectInstance2.XmlLiteral2.Text ' is empty Dim sTest3 As String = MyObjectInstance2.XmlLiteral3.Text ' is empty ' sTest3 and sTest3 should be populated but are not? xmlReader = Nothing End Sub Public Class MyObject Private _aProperty As String Private _XmlLiteral1 As XmlLiteral Private _XmlLiteral2 As XmlLiteral Private _XmlLiteral3 As XmlLiteral Public Property aProperty As String Get Return _aProperty End Get Set(ByVal value As String) _aProperty = value End Set End Property Public Property XmlLiteral1 As XmlLiteral Get Return _XmlLiteral1 End Get Set(ByVal value As XmlLiteral) _XmlLiteral1 = value End Set End Property Public Property XmlLiteral2 As XmlLiteral Get Return _XmlLiteral2 End Get Set(ByVal value As XmlLiteral) _XmlLiteral2 = value End Set End Property Public Property XmlLiteral3 As XmlLiteral Get Return _XmlLiteral3 End Get Set(ByVal value As XmlLiteral) _XmlLiteral3 = value End Set End Property Public Sub New() _XmlLiteral1 = New XmlLiteral _XmlLiteral2 = New XmlLiteral _XmlLiteral3 = New XmlLiteral End Sub End Class <System.Xml.Serialization.XmlRootAttribute(Namespace:="", IsNullable:=False)> _ Public Class XmlLiteral Implements IXmlSerializable Private _src As String Public Property Text() As String Get Return _src End Get Set(ByVal value As String) _src = value End Set End Property Public Sub New() _src = "" End Sub Public Sub New(ByVal Text As String) _src = Text End Sub #Region "IXmlSerializable Members" Private Function GetSchema() As System.Xml.Schema.XmlSchema Implements IXmlSerializable.GetSchema Return Nothing End Function Private Sub ReadXml(ByVal reader As System.Xml.XmlReader) Implements IXmlSerializable.ReadXml Dim StringType As String = "" If reader.IsEmptyElement OrElse reader.Read() = False Then Exit Sub End If _src = reader.ReadOuterXml() End Sub Private Sub WriteXml(ByVal writer As System.Xml.XmlWriter) Implements IXmlSerializable.WriteXml writer.WriteRaw(_src) End Sub #End Region End Class End Class

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