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• What is the equivalent to Java's canvas object in C#?

  - by Winston

  I'm working on creating a basic application that will let a user draw (using a series of points) and I plan to do something with these points. If this were Java, I think I would probably use a canvas object and some Java2D calls to draw what I want. All the tutorials I've read on C#/Drawing involve writing your own paint method and adding it to the paint event for the form. However, I'm interested in having some traditional Form controls as well and I don't want to be drawing over them. So, is there a "Canvas" object where I can constrain what I'm drawing on? Also, is WinForms a poor choice given this use case? Would WPF have more features that would help enable me to do what I want? Or Silverlight?

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• Create an assembly in memory

  - by Jared I

  I'd like to create an assembly in memory, using an using the classes in Reflection.Emit Currently, I can create the assembly and get it's bytes using something like AssemblyBuilder builder = AppDomain.CurrentDomain.DefineDynamicAssembly(..., AssemblyBuilderAccess.Save); ... create the assembly ... builder.Save(targetFileName); using(FileStream fs = File.Open(targetFileName, FileMode.Open)) { ... read the bytes from the file stream ... } However, it does so by creating a file on the local filesystem. I don't actually need the file, just the bytes that would be in the file. Is it possible to create the assembly without writing any files?

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• XMLHttpRequest error in IE, works without issue in Chrome/FF

  - by culov

  function addRequest(req) { try { request = new XMLHttpRequest(); } catch (e) { try{ request = new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ try { request = new ActiveXObject("Microsoft.XMLHttp"); } catch (e) { alert("XMLHttpRequest error: " + e); } } } request.open("GET", req, true); request.send(null); return request; } As you can see, it IE apparently fails all 3 ways in which I try to make the request. I've been doing plenty of searches to try and find what may be the issue, but by all accounts ive read, the code ive posted above should work. i havent used jquery for AJAX, but ive seen it recommended when others have had issues with httprequest objects. could i just replace the mess above with a couple lines of jquery and assume that it will take care of IE's ugliness? Thanks!

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• Key logging in .NET

  - by Moshe

  Is it possible to write a key logger in Visual Basic.NET? Is this the right language to be using? So far, I've gotten a console app to read input and append to a file. 1)How can I make a .NET program "catch" all keyboard input? 2)How do I make a process not show up in Task Manager? This is not for a virus, but rather a parental control program for a specific clientele. No malicious intent here.

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• synchronized block in JSP tag class

  - by Sudhakar

  Hi, I am trying to find answer for the following ,for the past couple of days ,but couldnt find comprehensive answer Problem Statement I have a custom JSP tag class which handles a web form submission ,captures data and write it to same file in the filesystem. As all web applications,this can be triggeredsimultaneosly ,and i fear that multiple threads would be in action handling each of the submission (we all know thats how Servlet works.) CODE synchronized (this){ final String reportFileName = "testReport.csv"; File reportDir = new File( rootCsDirectory, "reports" ); if(!reportDir.isDirectory())reportDir.mkdir(); File reportFile = new File (reportDir, reportFileName); logReport(reportFile,reportContent.toString()); } ISSUE: - A File object can be opened by one thread for writing and at same time another thread might try to access and fail and throw an exception So i thought of synchronizing (on the object ) should solve the issue , but read some where that jsp engine would have pool of jsp tag objects, so i am afraid that synchronized (this) wont work and it should be changed to synchronized (this.getClass())

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• replace a text string

  - by shantanuo

  I want to replace the date found at the end of the "datadir" line with the current date. For e.g. my my.cnf file looks like this... # head /etc/my.cnf [mysqld] #mount -t tmpfs -o size=102m tmpfs /mnt #datadir=/mnt read-only datadir=/mysqlApr5 #datadir=/mysqlApr2 #datadir=/mysqlMar16 #datadir=/mysqlFeb25a Most of the lines are commented. I need to find the datadir line that is not commented and then replace the /mysqlApr4 with /mysqlApr20 datadir=/mysqlApr20 If it is possible I will like to comment the older datadir path. #datadir=/mysqlApr5 I can output the current date as: date '+%b%d' But I want to concat it with the word "/mysql" and replace or comment the current datadir line.

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• Any best practices with feedback colours?

  - by alex

  I have a few that I think are correct. These are background colours for messages. ERROR: red; INFO: blue; SUCCESS: green; NOT IMPORTANT INFO: yellow Have I got the blue and yellow around the wrong way? Any hex values that are a de facto standard for these? I am curious considering web development, but I think the answers will be agnostic. Here is an interesting thought (I'm sure I've read about it in an article). What colours would the errors be on Target's website, considering all their branding is red?

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• Entity Framework v4 examples and tutorials of conceptual model mapping

  - by Rody van Sambeek

  In an application I'm writing I have a fairly complicated Database model. I'd like to use EF4 to map this to a whole lot nicer conceptual model. However all the tutorials I've read are with samples of 2 or 3 tables which all map 1 on 1 to the conceptual model. I'd like to learn how to correctly map the database model to a different conceptual model using VS 2010. However I can't find any good tutorials or (preferabally) instruction video's. Somebody got any tips, links or even books?

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• when i try to save this file it creates and folder for the entire path

  - by girish

  ZipFileToCreate = "c:\user\desktop\webservice\file.zip"; so, when i try to save this file it creates the folder for the path like user\desktop\webservice\file\ why is it so, FileStream fs = new FileStream(ZipFileToCreate, FileMode.Open); byte[] data = new Byte[fs.Length]; BinaryReader br = new BinaryReader(fs); br.Read(data, 0, data.Length); br.Close(); Response.Clear(); Response.ContentType = "application/x-zip-compressed"; Response.AppendHeader("Content-Disposition", "filename=" + Parameter + ".zip"); DeleteOldFiles(); Response.BinaryWrite(data);

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• How to use Fluent style syntactic sugar with c# property declaration

  - by Thomas

  i never use fluent style code before. so first time i tried to develop Fluent style with c# property declaration but getting error. can any one help me. public class MailTemplate { string _MailBody = ""; public MailTemplate MailBody { get { return _MailBody; } set { _MailBody = value ; } } string _Subject = ""; public MailTemplate Subject { get { return _Subject; } set { _Subject = value; } } string _MailFrom = ""; public MailTemplate MailFrom { get { return _MailFrom; } set { _MailFrom = value; } } } please help me how could assign or initialize mail body and later also can read with same property name. i think proeprty can not be use in case of fluent style development. need some light here. thanks

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• Create a Sharepoint Blog comment in code ...

  - by Ren Hoek

  I have the need to create Sharepoint blog comments by code: SPSecurity.RunWithElevatedPrivileges(delegate() { sw.AllowUnsafeUpdates = true; SPList spList = SPContext.Current.Web.Lists["Kommentare"]; SPListItem listItem = spList.Items.Add(); listItem[listItem.Fields["Titel des Beitrags"].InternalName] = SPContext.Current.Item["Title"]; listItem[listItem.Fields["Titel"].InternalName] = titlearea.Value; listItem[listItem.Fields["Textkörper"].InternalName] = CommentArea.Value; listItem[SPBuiltInFieldId.Author] = curUser; // listItem[SPBuiltInFieldId.Modified] = curUser; listItem.Update(); //spList.Update(); sw.AllowUnsafeUpdates = false; }); but I allways get a "Invalid data has been used to update the list item. The field you are trying to update may be read only" I tried Systemupdate and the values seem to be valid. Has Anybody an idea? Greetings ren

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• Are fopen/fread/fgets PID-safe in C ?

  - by Jane

  Various users are browsing through a website 100% programmed in C (CGI). Each webpage uses fopen/fgets/fread to read common data (like navigation bars) from files. Would each call to fopen/fgets/fread interefere with each other if various people are browsing the same page ? If so, how can this be solved in C ? (This is a Linux server, compiling is done with gcc and this is for a CGI website programmed in C.) Example: FILE *DATAFILE = fopen(PATH, "r"); if ( DATAFILE != NULL ) { while ( fgets( LINE, BUFFER, DATAFILE ) ) { /* do something */ } }

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• Confused about using SpringMVC Vs JEE project in Netbeans

  - by Sanju

  Hi all, I want to start a my first JEE project. I have read a lot that springMVC framework is a good choice (never used though) My earlier experience with java is not much. only some small app development using Netbeans. so I have some experience using Netbeans. but I see that I can start a JEE project in Netbeans. so what kind of framework netbeans is using underneath. PS: My understanding of framework (e.g. SpringMVC) is that you follow rule of framework to configure your app. and then framework take care or linking your View, controller and model. so if i am using netbeans, do i need to take care of linking of my MVC by myself?

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• Connecting to multiple firebird Databases via Delphi

  - by Branden

  I am integrating a system with 2 other applications, 1 using a Firebird database whilst the other BIS (using ADO). My delphi application uses Firebird. I need to read data from my database, insert it into both the BIS database and the other application firebird database. I have created seperate data modules for each. Sending data to the ADO works fine, but when writing to the other Firebird DB (my db still open) I get strange errors. I have managed to isolate the problem to the second firebird DB. Small data writes seems fine. The data structures are completly different, so un able to use a synch tool. is there a way to overcome this by using multi threading or seperate memory space each Firebird instance uses?

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• Problem requesting a HTTPS with TCL

  - by Javier

  Hi Everybody, I'm trying to do the following request using TCL (OpenACS) http::register https 443 tls::socket set url "https://encrypted.google.com" set token [http::geturl $url -timeout 30000] set status [http::status $token] set answer [http::data $token] http::cleanup $token http::unregister https The problem is that when I read the $status variable I get "eof" and the $answer variable becomes empty. I tried enabling tls V.1 http::register https 443 [list tls::socket -tls1 1] and it works only for the site https://www.galileo.edu, but not for https://encrypted.google.com. The site what I'm trying to connect is https://graph.facebook.com/me/feed?access_token=... but it doesn't work. I used curl to retrieve the contents of the pages in HTTPS and it works, I have installed OpenSSL, so I can't see the problem, there is another way to do HTTPS connections with TCL?. I can't see if this is a problem of coding (maybe I'm registered wrong the https protocol) or maybe It is a bad configuration of my server. Hope somebody helps!! Thanks!

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• copy or clone a HSSFWorkbook

  - by Fortega

  Hi, Currently I am doing the following in a loop (at least 300 times): - create a HSSFWorkbook from a template file - add some values to specific cells in the workbook - save the workbook as a new excel file The first line takes about 70% of the time (reading excel file). What I would like to do is to take this out of the loop, and read the file only once. In the loop, I would like to copy or clone the template HSSFWorkbook. However, I can't find anything about copying/cloning a HSSFWorkbook. Did some of you do this before? Any tips?

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• How to access Outlook's Scheduler in asp.net

  - by Rajesh Rolen- DotNet Developer

  Please tell me how can i use/integrate/get Outlook's Scheduler in my asp.net application. i mean a person can use Outlook's scheduler to create his schedule..and i can show it in my asp.net application. or if any sample scheduler code/control is available than also give me link of it.. plez help me out.. thanks. i have just read about "Google Data API" and "Calendar Data API" plez tell me about it.. is it can provide me facilities of good scheduler?

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• Get clientid in user control from external javascript file

  - by Giorgi

  Hello, I am developing a user control (ascx) in ASP.NET which uses javascript for manipulating controls. Currently the javascript code is inlined and uses <%= somecontrol.ClientID %> to get the control it needs. I want to put the javascript file in external file but from external file I cannot use the above syntax for retrieving controls. I have read about possible solutions in this and this answers but the problem is that the user control can be placed multiple times on page. This means that the Controls array (mentioned in the answers) will be rendered several times with different items. As a result the script will not be able to retrieve the id it needs. If I put <%= ClientId %> in the name of array that holds items then I will have the same problem as I am trying to solve. Any ideas?

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• C1083 : Permission denied on .sbr files

  - by speps

  Hello, I am using Visual Studio 2005 (with SP1) and I am getting weird errors concerning .sbr files. These files, as I read on MSDN, are intermediate files for BSCMAKE to generate a .bsc file. The errors I get are, for example (on different builds) : 11string.cpp : fatal error C1083: Impossible d'ouvrir le fichier généré(e) par le compilateur : '.\debug\String.sbr' : Permission denied 58type.cpp : fatal error C1083: Impossible d'ouvrir le fichier généré(e) par le compilateur : '.\Debug/Type.sbr' : Permission denied Translation : cannot open compiler intermediate file It seems to be consistent (I have at least 5 or 6 examples like this) with a .cpp file being compiled twice in the same project, respectively : 11String.cpp *some warnings, 2 lines* 11String.cpp 58Type.cpp *some warnings and other files compiled, a lot of lines* 58Type.cpp I already checked the .vcproj files for duplicate entries and it does not seem to be the problem. I would appreciate any help regarding this issue. Deactivating the build of .bsc files seems to be a workaround but maybe someone has better information than this. Thanks.

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• Is it possible to control the destination folder when checking out a project from VSS 2005?

  - by swolff1978

  We are currently using VSS 2005 for source control - and please let me start by saying, I've read a lot of posts on Stackoverflow and I realize VSS is the devil. That being said... its what we have to work with now and I have a question about the checkout process. We have the code organized in a certain hierarchy on the vss server, but when we do a checkout we don't need that same hierarchy on our machines. Is there a way to control how visual studio 2008 and vss 2005 create the checkout destination folder so that I don't end up with the code being 9 folders deep on MY machine?

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• Possible Encoding Issue Reading HTM File using .Net Streamreader

  - by Brian Boatright

  I have an HTML file with a ® (copyright) and ™ (trademark) symbol in the text. These are just two among many other symbols. When I read the html file into a literal control it converts the symbols to something else. The copyright symbol converts to ? (open box in ff) The trademark symbol converts to ™ (as expected) If (System.IO.File.Exists(FullName)) Then Dim StreamReader1 As New System.IO.StreamReader(FullName) Contents.Text = StreamReader1.ReadToEnd() StreamReader1.Close() End If Contents is a <asp:Literal runat="server" ID="Contents"></asp:Literal> and it's the only control in the aspx page. From some research I think this is related to the encoding but I don't know why it would change how to fix it. The html file does not contain any Content-Type settings in the head section.

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• how i can open different linux terminal to output differnt kinds of debug information in python?

  - by Registered User KC

  Hi All, I need output different information to different terminal instances instead of print them in same output stream, say std.err or std.out. for example: I have 5 kinds of information say A-E need to be displayed on different terminal windows on same desktop, looks like [terminal 1] <- for displaying information A [terminal 2] <- for displaying information B [terminal 3] <- for displaying information C [terminal 4] <- for displaying information D [terminal 5] <- for displaying information E I know I can output them into different files, then open terminals read the file in loop, but what I want is python program can open terminal by program itself and print to them directly when it is needed. Is it possible? Thanks! KC

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• PostgreSQL 8.3 data types: xml vs varchar

  - by Sejanus

  There's xml data type in Postgres, I never used it before so I'd like to hear opinions. Downsides and upsides vs using regular varchar (or Text) column to store xml. The text I'm going to store is xml, well-formed, UTF-8. No need to search by it (I've read searching by xml is slow). This XML actually is data prepared for PDF generation with Apache FOP. XML can be generated dynamically from data found elsewhere (other Postgres tables), it's stored as is only so that I won't need to generate it twice. Kinda backup#2 for already generated PDF documents. Anything else to know? Good practices, performance, maintenance, etc?

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• Non-Relational DBMS Design Resources

  - by Matt Luongo

  Hey guys, As a personal project, I'm looking to build a rudimentary DBMS. I've read the relevant sections in Elmasri & Navathe (5ed), but could use a more focused text. The rub is that I want to play with novel non-relational data models. While a lot of E&N was great- indexing implementation details in particular- the more advanced DBMS implementation was only targeted to a relational model. I could also use something a bit more practical and detail-oriented, with real-world recommendations. I'd like to defer staring at DBMS source for a while if I can. Any ideas?

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• Deserializing a type at the current stream position with protobuf-net

  - by Arne Claassen

  I'm serializing several objects into a single stream, but when i try to read them back, i can't seem to get anything but the last object: ProtoBuf.Serializer.Serialize(stream, postA1); ProtoBuf.Serializer.Serialize(stream, postB2); stream.Position = 0; var postA2 = ProtoBuf.Serializer.Deserialize<Post>(stream); var postB2 = ProtoBuf.Serializer.Deserialize<Post>(stream); The first deserialize moves the stream to the end and postA2 contains the value of postB2, while postB2 is just an uninitialized instance. Is this expected behavior, and if so, how do you deserialize an object from a random position in a stream?

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