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  • How to write Asynchronous LINQ query?

    - by Morgan Cheng
    After I read a bunch of LINQ related stuff, I suddenly realized that no articles introduce how to write asynchronous LINQ query. Suppose we use LINQ to SQL, below statement is clear. However, if the SQL database responds slowly, then the thread using this block of code would be hindered. var result = from item in Products where item.Price > 3 select item.Name; foreach (var name in result) { Console.WriteLine(name); } Seems that current LINQ query spec doesn't provide support to this. Is there any way to do asynchronous programming LINQ? It works like there is a callback notification when results are ready to use without any blocking delay on I/O.

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  • C or C++ to write a compiler?

    - by H.Josef
    I want to write a compiler for a custom markup language, I want to get optimum performance and I also want to have a good scalable design. Multi-paradigm programming language (C++) is more suitable to implement modern design patterns, but I think that will degrade performance a little bit (think of RTTI for example) which more or less might make C a better choice. I wonder what is the best language (C, C++ or even objective C) if someone wants to create a modern compiler (in the sense of complying to modern software engineering principles as a software) that is fast, efficient, and well designed.

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  • How to write this in different regex flavours

    - by taspeotis
    I have the following data: a b c d FROM:<uniquepattern1> e f g h TO:<uniquepattern2> i j k l FROM:<uniquepattern1> m n o p TO:<uniquepattern3> q r s t FROM:<uniquepattern4> u v w x TO:<uniquepattern5> I would like a regex query that can find the contents of TO: when FROM:<uniquepattern1> is encountered, so the results would be uniquepattern2 and uniquepattern3. I am hopeless with regex, I would appreciate any pointers on how to write this (lookahead parameters?) and any differences between regex on different platforms (eg the C# .NET Regex versus Grep vs Perl) that might be relevant here. Thank you.

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  • write client ip in iis 7.0 log over firewalls

    - by Guy Bertental
    Hi, I a solution for IIS 7.0 which runs on windows server 2008 64bit to write my clients IP to IIS logs while the server is behind firewalls and proxies (Pass X-Forwarded-For header value). I've tried to install the an ISAPI Filter written by Joe Pruitt. it works great on Windows Server 2003 32bit IIS 6.0, but seems to do nothing at all on windows server 2008 64bit IIS 7.0. Did anyone try this ISAPI filter on this version of OS? or have another solution? link to the Joe Pruitt's (from F5) ISAPI filter: http://devcentral.f5.com/weblogs/Joe/archive/2009/08/19/x_forwarded_for_log_filter_for_windows_servers.aspx best regards, guy bertental

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  • How to write custom reports in Drupal

    - by Nicholai
    What's the "right" way in Drupal to create reports? I was hoping to use a view but am not having much luck. My goal is to create a table of rows containing three fields: user name, location, SUM of volunteer hours. Once I have this part working, I plan to expose filters for Location and Date. Views Calc only allows you to group by one field. I know Crystal Reports and MSSQL Reporting Services and I was hoping to find a similar kind of thing for Drupal. Is there a framework, examples, or a module to help with this, or do I need to write a custom module implementing the views_alter_SQL hook to get the desired data for each report? EDIT: I ended up getting it to work with BIRT reports, which gave a lot more power than Views could allow. Code is on my blog: http://nicholaiburton.com/blog/2010/creating-custom-reports-for-drupal

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  • read url in binary mode in java

    - by Andrew Zawok
    In java I need to read a binary file from a site and write it to a disk file. This example http://java.sun.com/docs/books/tutorial/networking/urls/readingURL.html could read webpages succesfully, but when I try to read a binary file from my localhost server and write it to a disk file the contents change, corrupting the binary file. Using fc I see that 0x90 is changed to 0x3F and other changes. How do I acess the binary files (read url and write to file) without java or anything else changing ANY characters, like doing any newline conversions or character conversions or anything else, simply reading input url and writing it out as a file.

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  • Storing entity in XML, using MVVM to read/write in WPF Application

    - by Christian
    Say I've a class (model) called Instance with Properties DatbaseHostname, AccessManagerHostname, DatabaseUsername and DatabasePassword public class Instance { private string _DatabaseHostname; public string DatabaseHostname { get { return _DatabaseHostname; } set { _DatabaseHostname = value; } } private string _AccessManagerHostname; public string AccessManagerHostname { get { return _AccessManagerHostname; } set { _AccessManagerHostname = value; } } private string _DatabaseUsername; public string DatabaseUsername { get { return _DatabaseUsername; } set { _DatabaseUsername = value; } } private string _DatabasePassword; public string DatabasePassword { get { return _DatabasePassword; } set { _DatabasePassword = value; } } } I'm looking for a sample code to read/write this Model to XML (preferably linq2XML) = storing 1:n instances in XML. i can manage the the view and ViewModel part myself, although it would be nice if someone had a sample of that part too..

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  • How to write a linter?

    - by jbdavid
    In my day job I, and others on my team write a lot of hardware models in Verilog-AMS, a language supported primarily by commercial vendors and a few opensource simulator projects. One thing that would make supporting each others code more helpful would be a LINTER that would check our code for common problems and assist with enforcing a shared code formatting style. I of course want to be able to add my own rules and, after I prove their utility to myself, promote them to the rest of the team.. I don't mind doing the work that has to be done, but of course also want to leverage the work of other existing projects. Does having the allowed language syntax in a yacc or bison format give me a leg up? or should I just suck each language statement into a perl string, and use pattern matching to find the things I don't like? (most syntax and compilation errors are easily caught by the commercial tools.. but we have some of our own extentions.)

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  • sql server 2008 express one row write problem

    - by bojanskr
    Hi everyone, I have the most bizarre problem(at least it is bizarre to me) with MSSQL Server Express 2008. The problem is the following: On the development machine I use MS SQL Server 2008 Enterprise....I get some data from a WCF service and write that data to the db (simple as it can be)....I should point out however that the writing, it is done in a separate thread. BUt, anyway no problems during development...all the data is there. Then I set everything up(connection strings .\SQLEXPRESS, other settings) build in Release and copy that to a test machine that has MS SQL Server Express installed(because my application is a client application and it should work with Express)...I run the program....the program retrieves the data from the service...and when I look at the database...I'm in for a big suprise...there's only one row written(the first row received from the WCF service). I would really appreciate any help...I'm in a deadlock here. Thanks in advance. Bojan

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  • How to write Composition and Aggregation in java

    - by Mifas
    I want to know how to identify composition and aggregation code in java. I have C++ Code, But I don't understand how to write in java. Composition class A {}; class B { A composited_A; }; Aggregation via Pointer class A {}; class B { A* pointer_to_A; B(A anA){ pointer_to_A = &anA; } Can anyone please tell me how both are working in JAVA. (I know what is meant by Composition and aggregation ) };

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  • Cakephp doesn't write a cookie

    - by radious
    Hello! I have a problem with writing cookies in cakephp and even don't know how to debug it or where too look for a clue. I've inherited a project where cookie were only created using the Session component, of course i added 'Cookie' to $components array in app_controller and put this in beforeFilter: $this->Cookie->name = 'foo'; $this->Cookie->path = '/home/~nick'; $this->Cookie->domain = 'hostname'; $this->Cookie->secure = false; //i.e. only sent if using secure HTTPS $this->Cookie->key = 'some key'; and in some action i use: $this->Cookie->write('key', 'value'); I access page by http://hostname/home/~nick/foo and actually try to put even something so silly. I doesn't work. I would be really gratefully for any clue where to search problem. Thanks!

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  • Write a sql to get the last data

    - by Lu Lu
    Hello everyone, I have a Realtime table with example data: Symbol Date Value ABC 1/3/2009 03:05:01 327 -- is last data for 'ABC' ABC 1/2/2009 03:05:01 326 ABC 1/2/2009 02:05:01 323 ABC 1/2/2009 01:05:01 313 BBC 1/3/2009 03:05:01 458 -- is last data for 'BBC' BBC 1/2/2009 03:05:01 454 BBC 1/2/2009 02:05:01 453 BBC 1/2/2009 01:05:01 423 Please help me to write a sql to return last data for all symbol. The result is: Symbol Date Value ABC 1/3/2009 03:05:01 327 BBC 1/3/2009 03:05:01 458 P/s: I use sql server 2005. And Realtime data is very big, please optimize the sql code. Thanks.

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  • Jackson - suppressing serialization(write) of properties dynamically

    - by kapil.israni
    I am trying to convert java object to JSON object in Tomcat/jersey using Jackson. And want to suppress serialization(write) of certain properties dynamically. I can use JsonIgnore, but I want to make the ignore decision at runtime. Any ideas?? So as an example below, I want to suppress "id" field when i serialize the User object to JSON.. new ObjectMapper.writeValueAsString(user); class User { private String id = null; private String firstName = null; private String lastName = null; //getters //setters }//end class

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  • How to get a 64 bit dll with c source file, def file, link file by using command line in vc 6.0

    - by allan
    Hi, all My compile environment is windows xp and vc 6.0. Now I have a c source file(msgRout.c), def file(msgRout.def), link file(msgRout.link), then I use commands below to get a 32 bit dll: 1.cl /I ../include -c -W3 -Gs- -Z7 -Od -nologo -LD -D_X86_=1 -DWIN32 -D_WIN32 -D_MT -D_DLL msgRout.c 2.lib -out:msgRout.lib -def:msgRout.def -machine:i386 3.link /LIBPATH:../../Lib -nod -nologo -debug:full -dll @msgRout.link -out:msgRout.dll But the dll I got cannot be loaded on X64 application. it required a 64 bit dll. So here is my question: Can I get a 64 bit dll with vc 6.0? Using only above 3 commands alike, how can I get 64 bit dll? Many GREAT THANKS!!! Allan

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  • Tool to write linear temporal logic from UML 2.0 sequence diagram

    - by user326180
    i am working on checking model consistency of software. to do this i need to write linear temporal logic for UML 2.0 sequence diagram. if any body have any other tool for the same please response as soon as possible. I will be very obliged to you. i have found charmy tool have plugin for the same. Does anybody have source code for charmy tool(CHecking ARchitectural Model consistencY). It is not available on their website. Thanks in advance.

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  • how to write barcode in html format when using tcpdf

    - by JewelThief
    I am using TCPDF to generate PDF file using following command $pdf-writeHTML($htmlcontent, true, 0, true, 0); TCPDF also provides a way to create barcode with following commands $pdf-Cell(0, 0, 'C39+', 0, 1); $pdf-write1DBarcode('Code 39', 'C39+', '', '', 80, 15, 0.4, $style, 'N'); $pdf-Ln(); I want to be able to write barcode as part of the HTML code above. Is there easy way? I can potentially call a barcode image inthe writeHTML code above, but not sure how to use above barcode function ( or any in TCPDF) which would allow me to create image and then get that image into HTML generation

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  • How to write a SQL query for numerous conditions with lots of fields in ASP.NET

    - by Yongwei Xing
    Hi all I have a ASP.NET site. There is a table in the SQL Server with more than 30 fields. I need make a page on which there are many filters to query data from database based on the filters you select or input. One filter for one fields in the database. The filter would be dropdown list, textbox,checkbox or listbox. If you do not choose one filter, it means select all for this field. So there are lots of combination for these fields. Is there any simple way to write such page and query for this requirement? Best Regards,

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  • What are possible reasons for java.io.IOException: "The filename, directory name, or volume label sy

    - by Turismo
    I am trying to copy a file using the following code: File targetFile = new File(targetPath + File.separator + filename); ... targetFile.createNewFile(); fileInputStream = new FileInputStream(fileToCopy); fileOutputStream = new FileOutputStream(targetFile); byte[] buffer = new byte[64*1024]; int i = 0; while((i = fileInputStream.read(buffer)) != -1) { fileOutputStream.write(buffer, 0, i); } For some users the targetFile.createNewFile results in this exception: java.io.IOException: The filename, directory name, or volume label syntax is incorrect at java.io.WinNTFileSystem.createFileExclusively(Native Method) at java.io.File.createNewFile(File.java:850) Filename and directory name seem to be correct. The directory targetPath is even checked for existence before the copy code is executed and the filename looks like this: AB_timestamp.xml The user has write permissions to the targetPath and can copy the file without problems using the OS. As I don't have access to a machine this happens on yet and can't reproduce the problem on my own machine I turn to you for hints on the reason for this exception.

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  • Write subquery in Criteria of nHibernate.

    - by Bipul
    I read about subquery in Criteria, but I am still unable to grasp it properly. So, here I am taking one example and if somebody can help me writing that using subquery it will be great. Lets say we have table Employee{EmployeeId.(int),Name(string),Post(string),No_Of_years_working(int)} Now I want all the employees who are Managers and working for less than 10 years. I know that we can get the result without using subqueries but I wanna use subquery just to understand how it works in criteria. So, how I can write Criteria using subquery to get those employees. Thanks

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  • Linux - Create ftp account with read/write access to only 1 folder

    - by Gublooo
    Hey guys.... I have never worked on linux and dont plan on working on it either - The only command I probably know is "ls" :) I am hosting my website on Eapps and use their cpanel to setup everything so never worked with linux. Now I have this one time case - where I need to provide access to a contractor to fix the CSS issues on my website. He basically needs FTP (read/write) access to certain folders. At a high level - this is my code structure /home/webadmin/example.com/html/images /css /js /login.php /facebook.php /home/webadmin/example.com/application/library /views /models /controllers /config /bootstrap.php /home/webadmin/example.com/cgi-bin I want the new user to be able to have access to only these folders /home/webadmin/example.com/html/js /home/webadmin/example.com/html/css /home/webadmin/example.com/application/views He should not be able to view even the content of other folders including files like bootstrap.php or login.php etc If any sys admins can help me set this account up - will really appreciate it. Thanks

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  • how to write mute logic when mute state is unknown

    - by Delan Azabani
    I'm writing an indicator-sound clone for OSS4. Setting the volume works fine now, but I'm having trouble with the muting aspect of my program. A couple of facts about muting in OSS4: vmix doesn't have a mute (and we use vmix for volume control) also, the 'media keys' way of controlling volume doesn't set a mute control, but rather, volume = 0 The problem with this is, when reading the vmix volume and encountering zero, we don't know if the user has actually set it to zero, or has it set to some other value, but has mute on. How should I write my muting logic? git code, if that helps

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  • How do I write this as an expression?

    - by itchi
    I'm trying to rewrite a linq to entities query to an expression. My model is a School can have many Persons where Persons are inherited out to teachers, students, etc. The following query works for me: IQueryable<DAL.TEACHER> teacher = from p in School select p.PERSON as ESBDAL.TEACHER; How would I write this as a query expression? I thought something like: IQueryable<DAL.TEACHER> teacher = School.Select(x=>x.PERSON) as IQueryable<DAL.TEACHER>; ...but it does not. Am I misunderstanding the .Select()?

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  • Help to the way to write a query for the requirement

    - by Lu Lu
    I need to write a SQL-Server query but I don't know how to solve. I have a table RealtimeData with data: Time | Value 4/29/2009 12:00:00 AM | 3672.0000 4/29/2009 12:01:00 AM | 3645.0000 4/29/2009 12:02:00 AM | 3677.0000 4/29/2009 12:03:00 AM | 3634.0000 4/29/2009 12:04:00 AM | 3676.0000 4/30/2009 12:00:00 AM | 3671.0000 4/30/2009 12:01:00 AM | 3643.0000 4/30/2009 12:02:00 AM | 3672.0000 4/30/2009 12:03:00 AM | 3634.0000 4/30/2009 12:04:00 AM | 3632.0000 4/30/2009 12:05:00 AM | 3672.0000 5/1/2009 12:00:00 AM | 3673.0000 5/1/2009 12:01:00 AM | 3642.0000 5/1/2009 12:02:00 AM | 3672.0000 5/1/2009 12:03:00 AM | 3634.0000 5/1/2009 12:04:00 AM | 3635.0000 I want to get the EOD's data of days which exist in table. (EOD = end of day). With the my sample's data, I will need to reture a table like following: Time | Value 4/29/2009 | 3676.0000 4/30/2009 | 3672.0000 5/1/2009 | 3635.0000 Please help me to solve my problem. Thanks.

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  • How to write async background workers that work on WPF flowdocument

    - by iBe
    I'm trying to write a background worker that processes a flowdocument. I can't access the properties of flowdocument objects because of the thread verification. I tried to serialize the document and loaded it on the worker thread which actually solved the thread verfication issue. However, once the processing is complete I also need to use things like TextPointer objects. Those objects now point to a objects in the copy not the original. Can anyone suggest the best way to approach such background processing in WPF?

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  • Regexing it up with IIS re-write module

    - by Michael Jasper
    I am developing a profile-based web application where each user is assigned there own url through their username & iis rewrite mod's magic. A typical user's profile url would be http://www.mymark.com/mike Each user is also created a blog in a multi-user wordpress installation. The wordpress url would look like this: http://www.mymark.com/blog/mike I am trying to use the rewrite module to create more canonical urls for the user (http://www.mymark.com/mike/blog), and have tried several regex variations that I have created through RegExr(a regex generation tool) and come up with this as the pattern to match (www.|)mymark.com/([^/]+)/blog but haven't had any success so far. What am I doing wrong here? Here is a screen shot of my re-write rule:

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