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  • Caching linked pages in ASP.NET

    - by n0e
    I'm thinking of a way of creating a local backup for the pages I will be linking to from my site. This would be text-only, similar to Google's 'Copy' feature on the search pages. The idea is to be sure that the pages I would reference to, or cite from, do not dissapear from the Web in the near future. I know I could just keep local copies, but I will have A LOT of citations. What would be the best way of achieving this in ASP.NET? Some custom caching in database?

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  • Android Stream Data Over Wifi?

    - by Neb
    Im trying to make an app for android that will stream the data of the accelerometer to be used as a game controller on my pc over a local wifi connection. Is it possible to make some kind of wifi stream of the accelerometer values in the android app and then make the pc somehow 'read' this stream? Or would it just be better for the pc to make endless calls to the phone getting the newest accelerometer values from a local android server? It would also have to send commands from the phone such as 'button1 pressed', 'button1 released'.

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  • Impersonation on Windows 2000 to Windows XP Leaves Connections Open

    - by Tallek
    I'm running on a Windows 2000 Pro SP4 box (off domain) and trying to impersonate a local user on a Windows XP box (on domain). I'm using code very similar to the WindowsImpersonationContextFacade in the question posted here: http://stackoverflow.com/questions/879704/how-can-i-temporarily-impersonate-a-user-to-open-a-file. I am using impersonation to remotely start and stop windows services as well as access network shares (for some automated integration tests). To get this working, i had to use LOGON32_PROVIDER_DEFAULT and LOGON32_LOGON_NEW_CREDENTIALS when calling LogonUser. Everything worked beautifully ( Windows XP on domain to Windows XP on domain, Windows XP on domain to Windows Server 2003 off domain, and even Windows XP on domain to Windows 2000 off domain). The one issue was running on Windows 2000 Pro SP4 off the domain and trying to impersonate a local user on a Windows XP box running on the domain. To get the Windows 2000 piece working, i had to use LOGON32_PROVIDER_WINNT50 and LOGON32_LOGON_NEW_CREDENTIALS when calling LogonUser. This seemed to get me 95% of the way there, i could now impersonate the local user on the XP box and start/stop services as well as access a network share using the impersonated credentials. I'm running in to one problem though, calling Undo impersonation and closing the token handle seems to leave the connection to the remote box open. After about 10 or so impersonation calls, further impersonation attempts will fail with an error saying something about too many connections are currently open. If i look at the Computer Management - System Tools - Shared Folders - Sessions on my remote Windows XP box, i can see about 10 sessions open to the Windows 2000 box. I can manually close these (i think they may eventually close themselves, but not very quickly) and then impersonation begins working again few more times. This open session issue doesn't seem to be a problem in any of my other test scenarios, just when running locally on a Windows 2000 box. Any ideas? Edit 1: After some more testing and trying out many different things, this seems to be an issue with open sessions not being reused. On Windows 2000 only, every call to LogonUser to get a token and then using that token to impersonate seems to result in a new session being created. I'm guessing Windows XP & Windows Server 2003 are reusing open sessions since i don't seem to be having any issues with them. If I call LogonUser once, then cache the token, I seem to be able to make as many calls to impersonate as I need using the cached token without running in to the "too many connections" issue. This seems like an ugly work around though since i can't call CloseHandle() on my token every time i perform impersonation. Anybody have any thoughts or ideas, or am i stuck with this ugly hack? Thanks

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  • How to use CLEAR USB internet connection in Ubuntu (host) and WindowsXP (guest) using VirtualBox

    - by bithacker
    I'm trying to use CLEAR Motorola WiMax USB in Ubuntu as there is no support for linux as yet. I've installed windowsxp as guest in ubuntu and the version I'm using is 3.2.2. USB is connecting fine in WindowsXP but I can't use internet in Ubuntu. Can you please tell me how to do it. Here is the configuration that could help you guys. Thanks in advance. I'm using Two Network Adapters. Network Adapter 1: PCnet-FAST III (NAT) Adapter 2: PCnet-FAST III (Host-only adapter, 'vboxnet0') ipconfig [on Guest windowsXP] Windows IP Configuration Ethernet adapter Local Area Connection: PCnet-FAST III (NAT) Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 10.0.2.15 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.0.2.2 Ethernet adapter Local Area Connection 3: PCnet-FAST III (Host-only adapter, 'vboxnet0') Connection-specific DNS Suffix . : IP Address. . . . . . . . . . . . : 192.168.56.101 Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : Ethernet adapter Local Area Connection 2: Connection-specific DNS Suffix . : CLEAR Motorola USB IP Address. . . . . . . . . . . . : 10.168.242.33 Subnet Mask . . . . . . . . . . . : 255.255.192.0 Default Gateway . . . . . . . . . : 10.168.192.2 IFCONFIG [on Host Ubuntu] (Ethernet) eth0 Link encap:Ethernet HWaddr 00:14:22:b9:9d:76 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:16 eth1 (Wireless) Link encap:Ethernet HWaddr 00:13:ce:f0:9b:0d inet6 addr: fe80::213:ceff:fef0:9b0d/64 Scope:Link UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:1 errors:0 dropped:5 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:84 (84.0 B) Interrupt:17 Base address:0xe000 Memory:dfcff000-dfcfffff lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:2292 errors:0 dropped:0 overruns:0 frame:0 TX packets:2292 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:171952 (171.9 KB) TX bytes:171952 (171.9 KB) vboxnet0 Link encap:Ethernet HWaddr 0a:00:27:00:00:00 inet addr:192.168.56.1 Bcast:192.168.56.255 Mask:255.255.255.0 inet6 addr: fe80::800:27ff:fe00:0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:137 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:21174 (21.1 KB)

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  • Problem with glaux.h locating

    - by rodnower
    Hello, I try to compile code, that beggins with: #include<stdlib.h> #include<GL/gl.h> #include<glaux.h> with command: cc -o test test.c -I/usr/local/include -L/usr/local/lib -lMesaaux -lMesatk -lMesaGL -lXext -lX11 -lm But one of errors I got is: test.c:3:18: error: glaux.h: No such file or directory Then I try: yum provides glaux.h but yum find anything. Before all I installed Mesa with: yum install mesa* So, can anyone tell me from where I can get the header file? Thank you for ahead.

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  • Where to add the PHP script and MYSQL Dump code in the LAMP server?

    - by primal
    Hi, I dont know if this is the right place to ask this question. But as time is limited and here I have always got the right answers I am asking it away. I want to setup a login page on a local server so as to communicate with it via android. As time permits, I googled and found out the necessary php script and mySQL code needed for the same. I don't know where to add these code in the local server and connect them. :( (This is mainly for testing purpose as we would develop a website in Django latter on.) Any help would be much appreciated..

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  • Giving event control back to xaml/callee to access check/uncheck

    - by dovholuk
    Hi All, I've scoured the Internet but my search-foo must not work if it's out there cause I just can't find the proper search terms to get me the answer I am looking for. So I turn to the experts here as a last resort to point me in the right direction. What I'm trying to do is create a composite control of a text box and a list box but I want to allow the control consumer to decide what to do when say the checkbox is checked/unchecked and I just can't figure it out... Maybe i'm going about it all wrong. What I've done thus far is to: create a custom control that extends ListBox expose a custom DP named "Text" (for the Text box but it's not the important part) craft the generic.xaml so that the list items have a default ItemTemplate/DataTemplate inside the DataTemplate I'm trying to set the "Checked" or "Unchecked" events expose 'wrapper' events as DPs in the custom control that would get 'set' via the template when instatiated As soon as I try something like the following (inside generic.xaml): <DataTemplate> <...> <CheckBox Checked="{TemplateBinding MyCheckedDP}"/> <...> </DataTemplate> I get runtime exceptions, the designer - vs2010 - pukes out a LONG list of errors that are all very similar and nothing I do can make it work. I went so far as to try using the VisualTreeHelper but no magic combination I could find would work nor would it allow me to traverse the tree because when the OnApplyTemplate method fires the listbox items don't exist yet and aren't in the tree. So hopefully this all makes sense but if not please let me know and I'll edit the post for clarifications. Thanks to all for any pointers or thoughts... Like I said maybe I'm heading about it in the wrong way from the start... EDIT (Request for xaml) generic.xaml datatemplate: <DataTemplate > <StackPanel Orientation="Horizontal" > <local:FilterCheckbox x:Name="chk"> <TextBlock Text="{Binding Path=Display}" /> </local:FilterCheckbox> </StackPanel> </DataTemplate> usercontrol.xaml (invocation of custom control) <local:MyControl FancyName="This is the fancy name" ItemChecked="DoThisWhenACheckboxIsChecked" <-- this is where the consumer "ties" to the checkbox events ItemsSource="{Binding Source={StaticResource someDataSource}}" />

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  • Android ndk build mysteriously failing under cygwin with "Error 126"

    - by Jan Hudec
    I have a JNI application built by ndk-build (using Android NDK r5b and cygwin make 3.81). The build usually works, by occasionally fails with: ... Compile++ thumb : components <= Component.cpp make: *** [/c/.hudson/jobs/Nightly/workspace/application/obj/local/armeabi/objs/components/Component.o] Error 126 make: Leaving directory `/c/.hudson/jobs/Nightly/workspace/application/obj/local/armeabi/objs/components' There is no other error. Make than exits with status 2. It happens in different file each time (the name above is anonymized). It seems to happen more often with parallel builds, but sometimes happens with non-parallel builds too. Does anybody have an idea what it might be or at least how to debug it?

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  • Weird stack trace in exception "The incoming request does not match any route"

    - by Tassadaque
    i have published asp.net mvc application on iis 6 on the server(windows server 2003) from local machine. On server i have set the default page to default.aspx. but when i try to browse the site on server, it gives me exception "The incoming request does not match any route" One thing i noticed is that. Stack trace on line 5 is shown below. it has one weird thing that exception is still pointing to my local machine path [HttpException (0x80004005): The incoming request does not match any route.] System.Web.Routing.UrlRoutingHandler.ProcessRequest(HttpContextBase httpContext) +15589 System.Web.Routing.UrlRoutingHandler.ProcessRequest(HttpContext httpContext) +40 System.Web.Routing.UrlRoutingHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext context) +7 **UserManagement._Default.Page_Load(Object sender, EventArgs e) in D:\Evoletpublishnew\UserManagement\UserManagement\Default.aspx.cs:18** System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +50 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627

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  • "The provider is not compatible with the version of Oracle client"

    - by psyb0rg
    I just put my asp .net web service on a remote host. The service accesses an oracle db on my local machine. The service worked fine when it was running on localhost but since moving to a remote hos, I get The provider is not compatible with the version of Oracle client at Oracle.DataAccess.Client.OracleInit.Initialize() at Oracle.DataAccess.Client.OracleConnection..cctor() --- End of inner exception stack trace --- at Oracle.DataAccess.Client.OracleConnection..ctor(String connectionString) at.... I know the error is related to the data provider version running on the server/client. In my case, the only dll I referenced in the project was Oracle.DataAccess So how do I go about solving this? Note that I won't be able to change anything on the web host other than my own project. My local machine is running Oracle 11g Thanks.

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  • While loop in IL - why stloc.0 and ldloc.0?

    - by Michael Stum
    I'm trying to understand how a while loop looks in IL. I have written this C# function: static void Brackets() { while (memory[pointer] > 0) { // Snipped body of the while loop, as it's not important } } The IL looks like this: .method private hidebysig static void Brackets() cil managed { // Code size 37 (0x25) .maxstack 2 .locals init ([0] bool CS$4$0000) IL_0000: nop IL_0001: br.s IL_0012 IL_0003: nop // Snipped body of the while loop, as it's not important IL_0011: nop IL_0012: ldsfld uint8[] BFHelloWorldCSharp.Program::memory IL_0017: ldsfld int16 BFHelloWorldCSharp.Program::pointer IL_001c: ldelem.u1 IL_001d: ldc.i4.0 IL_001e: cgt IL_0020: stloc.0 IL_0021: ldloc.0 IL_0022: brtrue.s IL_0003 IL_0024: ret } // end of method Program::Brackets For the most part this is really simple, except for the part after cgt. What I don't understand is the local [0] and the stloc.0/ldloc.0. As far as I see it, cgt pushes the result to the stack, stloc.0 gets the result from the stack into the local variable, ldloc.0 pushes the result to the stack again and brtrue.s reads from the stack. What is the purpose of doing this? Couldn't this be shortened to just cgt followed by brtrue.s?

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  • LOAD DATA INFILE not working in mariadb

    - by Haseena
    Iam trying to migrate from mysql to mariadb. On this time I can face an issue with mariadb. When I can trying to load a data file into a table, it shows an error like : SQL Error (29): File 'C:/Documents and Settings/Administrator/Local Settings/Temp/SAMPLE/DATA_TEMP1351761841668/SampleFile0' not found (Errcode: 2) But the file already exists in the path.... Another one point is that the same command successfully works with MySQL. Is MariaDB has any permission issue? Login as Administrator. See below my query : load data infile "'C:/Documents and Settings/Administrator/Local Settings/Temp/SAMPLE/DATA_TEMP1351761841668/SampleFile0" into table SAMPLETABLE; When changing the path loke "C:/SampleFile0", its working properly. From Administrator folder it doesn't working. Can anyone help me in this regard??? Iam a newone in MariaDB.

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  • Are we asking too much of transactional memory?

    - by Carl Seleborg
    I've been reading up a lot about transactional memory lately. There is a bit of hype around TM, so a lot of people are enthusiastic about it, and it does provide solutions for painful problems with locking, but you regularly also see complaints: You can't do I/O You have to write your atomic sections so they can run several times (be careful with your local variables!) Software transactional memory offers poor performance [Insert your pet peeve here] I understand these concerns: more often than not, you find articles about STMs that only run on some particular hardware that supports some really nifty atomic operation (like LL/SC), or it has to be supported by some imaginary compiler, or it requires that all accesses to memory be transactional, it introduces type constraints monad-style, etc. And above all: these are real problems. This has lead me to ask myself: what speaks against local use of transactional memory as a replacement for locks? Would this already bring enough value, or must transactional memory be used all over the place if used at all?

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  • orale clients dead wait

    - by Macroideal
    hi all friends I meet a problem yestoday...maybe it's becoz it is april 1st... but it did exist. here i begin clarifying: i have 3 pcs in remote area..2 clients and 1 oracle server.. my app is running seperately in the two clients hourly connecting to the oracles,,my clients worked well be4 April 1th, but suddenly my app in the clients mechines went down...first i did not change any configurations.... i used libsqlora8 to connect the server...I went into a dead loop in the library...I tried sqlplus, but it dead there in my shell terminal, like it meets a infinite loop....no return until i pressed ctrl + c, the reason i guess is "infinite loop" somewhere..... btw, when i used my local pc to connect the server, it worked well...just from this phenomenon, wen can see the is problems lie in the client mechines..and i check the configuration file both in local mechine and client mechines..they are identical have you met a problem like this.... I dont hope it's frank of April 1st

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  • C# Localization - unexpected behaviour

    - by vikp
    Hi, I have the following line of code: <%= Html.Label((string) GetLocalResourceObject("Label_Email")) %> This generates a label within an HTML page. In the local resource file I have the following entry: Name: Label_Email Value:Email For some very strange reason when I load the page in the browser, it generates an HTML label with a value of "Email Address" instead of "Email". This is a serious problem for me because I need to localize the application and not have english word "address". When I replace Value in the local resouce file with "Email " (notice extra space), everything works fine, but this is a hack and I need to understand why my application is behaving this way. Thank you

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  • What are the pros and cons of using an in memory DB rather than a ThreadLocal

    - by Pangea
    We have been using ThreadLocal so far to carry some data so as to not clutter the API. However below are some of issues of using thread local that which I don't like: 1) Over the years the data items being carried in thread local has increased 2) Since we started using threads (for some light weight processing), we have also migrating these data to the threads in the pool and copying them back again I am thinking of using an in memory DB for these (we doesn't want to add this to the API). I wondering if this approach is good. What are the pros and cons? thx in advance.

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  • How to call ejabberdctl from PHP (Apache)

    - by Adil
    Hi, I am trying to call ejabberdctl from PHP but i keep getting an error code of 3 (Failed RPC connection to the node ejabberd@localhost: nodedown). My PHP script contains the following code to add friends : exec('sudo /opt/ejabberd-2.1.2/bin/ejabberdctl add_rosteritem adil.baig40122310029739 godudu.com chburaska0822431111022397 godudu.com chburaska0822431111022397 Friends both', $output, $retCode); exec('sudo /opt/ejabberd-2.1.2/bin/ejabberdctl add_rosteritem chburaska0822431111022397 godudu.com adil.baig40122310029739 godudu.com adil.baig40122310029739 Friends both', $output, $retCode); I have also added ejabberdctl to /etc/sudoers like so : # Custom entry for ejabberdctl, so it can be used via PHP www-data ALL= NOPASSWD: /opt/ejabberd-2.1.2/bin/ejabberdctl I have also added the ejabberd bin directory to /etc/environment, like so : PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/opt/ejabberd-2.1.2/bin" source /etc/environment Everytime i run the PHP script $retCode (the exec return code) returns 3, but if i run the same php file from the command line it works. Help!

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  • A generic error occurred in GDI+.

    - by Pinu
    A generic error occurred in GDI+ [ExternalException (0x80004005): A generic error occurred in GDI+.] System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams) +615257 I have a webpage in which a pdf is converted to png, and using the response.outputstream it is displayed. when i run this on my local machine is works fine. but when i run the same code on server is throws this exception. my question is , where i could look in for error. as there is no inner exception or any other information provided. only clue is that it's happening on Image.Save , but the same code works perfectly fine on my local machine , then y is it not working on production???

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  • Django queries Especial Caracters

    - by Jorge Machado
    Hi, I Working on location from google maps and using django to. My question is: I have a String in request.GET['descricao'] lets say it contains "Via rapida". In my database i have store = "Via Rápida" i'm doing : local = Local.objects.filter(name__icontains=request.GET['descricao']) with that i can get everthing fine like "Via Rapida" but the result that have "Via rápida" never get match in the query (ASCI caracter may be ?) what must i do given a string "Via rapida" match "via rápida" and "via rapida" ? Regular Expressions ? how ? Thanks

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  • How to bind a List to a WPF treeview using Xaml?

    - by Joan Venge
    I don't know how to bind a List of Drink to a WPF TreeView. struct Drink { public string Name { get; private set; } public int Popularity { get; private set; } public Drink ( string name, int popularity ) : this ( ) { this.Name = name; this.Popularity = popularity; } } List<Drink> coldDrinks = new List<Drink> ( ){ new Drink ( "Water", 1 ), new Drink ( "Fanta", 2 ), new Drink ( "Sprite", 3 ), new Drink ( "Coke", 4 ), new Drink ( "Milk", 5 ) }; } } I have searched the web, for instance saw here. But what's this even mean: ItemsSource="{x:Static local:TreeTest.BoatList}" x:? static? local? How do you specify a collection in your code in the xaml?

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  • Should Python 2.6 on OS X deal with multiple easy-install.pth files in $PYTHONPATH?

    - by ahd
    I am running ipython from sage and also am using some packages that aren't in sage (lxml, argparse) which are installed in my home directory. I have therefore ended up with a $PYTHONPATH of $HOME/sage/local/lib/python:$HOME/lib/python Python is reading and processing the first easy-install.pth it finds ($HOME/sage/local/lib/python/site-packages/easy-install.pth) but not the second, so eggs installed in $HOME/lib/python aren't added to the path. On reading the off-the-shelf site.py, I cannot for the life of me see why it's doing this. Can someone enlighten me? Or advise how to nudge Python into reading both easy-install.pth files? Consolidating both into one .pth file is a viable workaround for now, so this question is mostly for curiosity value.

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  • Passing Strings by Ref

    - by SGWellens
    Humbled yet again…DOH! No matter how much experience you acquire, no matter how smart you may be, no matter how hard you study, it is impossible to keep fully up to date on all the nuances of the technology we are exposed to. There will always be gaps in our knowledge: Little 'dead zones' of uncertainty. For me, this time, it was about passing string parameters to functions. I thought I knew this stuff cold. First, a little review... Value Types and Ref Integers and structs are value types (as opposed to reference types). When declared locally, their memory storage is on the stack; not on the heap. When passed to a function, the function gets a copy of the data and works on the copy. If a function needs to change a value type, you need to use the ref keyword.  Here's an example:     // ---- declaration -----------------     public struct MyStruct    {        public string StrTag;    }     // ---- functions -----------------------     void SetMyStruct(MyStruct myStruct)     // pass by value    {        myStruct.StrTag = "BBB";    }     void SetMyStruct(ref MyStruct myStruct)  // pass by ref    {        myStruct.StrTag = "CCC";    }     // ---- Usage -----------------------     protected void Button1_Click(object sender, EventArgs e)    {        MyStruct Data;        Data.StrTag = "AAA";         SetMyStruct(Data);        // Data.StrTag is still "AAA"         SetMyStruct(ref Data);        // Data.StrTag is now "CCC"    } No surprises here. All value types like ints, floats, datetimes, enums, structs, etc. work the same way. And now on to... Class Types and Ref     // ---- Declaration -----------------------------     public class MyClass    {        public string StrTag;    }     // ---- Functions ----------------------------     void SetMyClass(MyClass myClass)  // pass by 'value'    {        myClass.StrTag = "BBB";    }     void SetMyClass(ref MyClass myClass)   // pass by ref    {        myClass.StrTag = "CCC";    }     // ---- Usage ---------------------------------------     protected void Button2_Click(object sender, EventArgs e)    {        MyClass Data = new MyClass();        Data.StrTag = "AAA";         SetMyClass(Data);          // Data.StrTag is now "BBB"         SetMyClass(ref Data);        // Data.StrTag is now "CCC"    }  No surprises here either. Since Classes are reference types, you do not need the ref keyword to modify an object. What may seem a little strange is that with or without the ref keyword, the results are the same: The compiler knows what to do. So, why would you need to use the ref keyword when passing an object to a function? Because then you can change the reference itself…ie you can make it refer to a completely different object. Inside the function you can do: myClass = new MyClass() and the old object will be garbage collected and the new object will be returned to the caller. That ends the review. Now let's look at passing strings as parameters. The String Type and Ref Strings are reference types. So when you pass a String to a function, you do not need the ref keyword to change the string. Right? Wrong. Wrong, wrong, wrong. When I saw this, I was so surprised that I fell out of my chair. Getting up, I bumped my head on my desk (which really hurt). My bumping the desk caused a large speaker to fall off of a bookshelf and land squarely on my big toe. I was screaming in pain and hopping on one foot when I lost my balance and fell. I struck my head on the side of the desk (once again) and knocked myself out cold. When I woke up, I was in the hospital where due to a database error (thanks Oracle) the doctors had put casts on both my hands. I'm typing this ever so slowly with just my ton..tong ..tongu…tongue. But I digress. Okay, the only true part of that story is that I was a bit surprised. Here is what happens passing a String to a function.     // ---- Functions ----------------------------     void SetMyString(String myString)   // pass by 'value'    {        myString = "BBB";    }     void SetMyString(ref String myString)  // pass by ref    {        myString = "CCC";    }     // ---- Usage ---------------------------------     protected void Button3_Click(object sender, EventArgs e)    {        String MyString = "AAA";         SetMyString(MyString);        // MyString is still "AAA"  What!!!!         SetMyString(ref MyString);        // MyString is now "CCC"    } What the heck. We should not have to use the ref keyword when passing a String because Strings are reference types. Why didn't the string change? What is going on?   I spent hours unssuccessfully researching this anomaly until finally, I had a Eureka moment: This code: String MyString = "AAA"; Is semantically equivalent to this code (note this code doesn't actually compile): String MyString = new String(); MyString = "AAA"; Key Point: In the function, the copy of the reference is pointed to a new object and THAT object is modified. The original reference and what it points to is unchanged. You can simulate this behavior by modifying the class example code to look like this:      void SetMyClass(MyClass myClass)  // call by 'value'    {        //myClass.StrTag = "BBB";        myClass = new MyClass();        myClass.StrTag = "BBB";    } Now when you call the SetMyClass function without using ref, the parameter is unchanged...just like the string example.  I hope someone finds this useful. Steve Wellens

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  • How can I await the first completed async task of a list in .Net?

    - by Eyal
    My input is a long list of files located on an Amazon S3 server. I'd like to download the metadata of the files, compute the hashes of the local files, and compare the metadata hash with the local files' hash. Currently, I use a loop to start all the metadata downloads asynchronously, then as each completes, compute MD5 on the local file if needed and compare. Here's the code (just the relevant lines): Dim s3client As New AmazonS3Client(KeyId.Text, keySecret.Text) Dim responseTasks As New List(Of System.Tuple(Of ListViewItem, Task(Of GetObjectMetadataResponse))) For Each lvi As ListViewItem In lvStatus.Items Dim gomr As New Amazon.S3.Model.GetObjectMetadataRequest gomr.BucketName = S3FileDialog.GetBucketName(lvi.SubItems(2).Text) gomr.Key = S3FileDialog.GetPrefix(lvi.SubItems(2).Text) responseTasks.Add(New System.Tuple(Of ListViewItem, Task(Of GetObjectMetadataResponse))(lvi, s3client.GetObjectMetadataAsync(gomr))) Next For Each t As System.Tuple(Of ListViewItem, Task(Of GetObjectMetadataResponse)) In responseTasks Dim response As GetObjectMetadataResponse = Await t.Item2 If response.ETag.Trim(""""c) = MD5CalcFile(lvi.SubItems(1).Text) Then lvi.SubItems(3).Text = "Match" UpdateLvi(lvi) End If Next I've got two problems: I'm awaiting the reponses in the order that I made them. I'd rather process them in the order that they complete so that I get them faster. The MD5 calculation is long and synchronous. I tried making it async but the process locked up. I think that the MD5 task was added to the end of .Net's task list and it didn't get to run until all the downloads completed. Ideally, I process the response as they arrive, not in order, and the MD5 is asynchronous but gets a chance to run. Edit: Incorporating WhenAll, it looks like this now: Dim s3client As New Amazon.S3.AmazonS3Client(KeyId.Text, keySecret.Text) Dim responseTasks As New Dictionary(Of Task(Of GetObjectMetadataResponse), ListViewItem) For Each lvi As ListViewItem In lvStatus.Items Dim gomr As New Amazon.S3.Model.GetObjectMetadataRequest gomr.BucketName = S3FileDialog.GetBucketName(lvi.SubItems(2).Text) gomr.Key = S3FileDialog.GetPrefix(lvi.SubItems(2).Text) responseTasks.Add(s3client.GetObjectMetadataAsync(gomr), lvi) Next Dim startTime As DateTimeOffset = DateTimeOffset.Now Do While responseTasks.Count > 0 Dim currentTask As Task(Of GetObjectMetadataResponse) = Await Task.WhenAny(responseTasks.Keys) Dim response As GetObjectMetadataResponse = Await currentTask If response.ETag.Trim(""""c) = MD5CalcFile(lvi.SubItems(1).Text) Then lvi.SubItems(3).Text = "Match" UpdateLvi(lvi) End If Loop MsgBox((DateTimeOffset.Now - startTime).ToString) The UI locks up momentarily whenever MDSCalcFile is done. The whole loop takes about 45s and the first file's MD5 result happens within 1s of starting. If I change the line to: If response.ETag.Trim(""""c) = Await Task.Run(Function () MD5CalcFile(lvi.SubItems(1).Text)) Then The UI doesn't lock up when MD5CalcFile is done. The whole loop takes about 75s, up from 45s, and the first file's MD5 result happens after 40s of waiting.

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