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• A good F# codebase to learn from

  - by Lucas

  Hi all, I've been teaching myself F# for a while now. I've read Programming F# by Chris Smith (great book) and I've written a few small scripts for getting the job done here and there. But IMO the best way to learn a new programming language—and more importantly, the idioms that come with it—is to read a good open source codebase written in that language. Naturally, writing code in that language is crucial, but in the beginning, you're basically struggling with your own ignorance about how things should be done. You could perform certain tasks one way or the other, but it takes experience to realize the flaws and virtues of each. Even after you've gotten a firm grasp of how things work, reading the code of people who have an even firmer one helps a great deal. Most would agree that the most insightful parts of any learn-a-programming-language book are the code examples, and reading a well-written open source codebase is the next level of that. So are there any out there for F#?

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• Forcing A Postback Asp.Net

  - by Nick LaMarca

  Please take a look at the following click event... Protected Sub btnDownloadEmpl_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDownloadEmpl.Click Dim emplTable As DataTable = SiteAccess.DownloadEmployee_H() Dim d As String = Format(Date.Now, "d") Dim ad() As String = d.Split("/") Dim fd As String = ad(0) & ad(1) Dim fn As String = "E_" & fd & ".csv" Response.ContentType = "text/csv" Response.AddHeader("Content-Disposition", "attachment; filename=" & fn) CreateCSVFile(emplTable, Response.Output) Response.Flush() Response.End() lblEmpl.Visible = True End Sub This code simply exports data from a datatable to a csv file. The problem here is lblEmpl.Visible=true never gets hit because this code doesnt cause a postback to the server. Even if I put the line of code lblEmpl.Visible=true at the top of the click event the line executes fine, but the page is never updated. How can I fix this?

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• making ajax request to another server

  - by santhosh

  Hi, I had a ajax sample code from W3Schools, where If i request ajax call to remote server the request getting fails. function loadXMLDoc() { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("myDiv").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","http://www.google.com",true); xmlhttp.send(); } How to solve this..?

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• Add RESTful Action

  - by Drew Rush

  The source of my information is section 2.9 here: [http://guides.rubyonrails.org/routing.html#connecting-urls-to-code][1] What I'm trying to do is add a custom action "search" and corresponding view. So, as it says to do in the documentation, I've added this code in my config/routes.rb file: resources :dimensions do collection do get "search" end end I've also defined in the dimensions_controller file: def search @dimensions = Dimension.all respond_to do |format| format.html # search.html.erb format.json { render json: @dimensions } end end I then stopped and restarted the rails server, but when I navigate to /dimensions/home, I'm still getting this error message: Couldn't find Dimension with id=search Also showing that my parameter is: {"id"=>"search"} So am I just missing another bit of code that gives the instruction to interpret /dimension/search as a collection action as opposed to the show action? Thanks for your time.

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• Context Menu SourceControl Error

  - by developer

  Hi All, I am trying to use contextmenu in my textbox control and I want to bind the textbox value to the value selected in context menu,below is my code <Window.CommandBindings> <CommandBinding Command="local:MyPanel.ChangeTextboxValue" Executed="ChangeTextboxValue_Executed"/> </Window.CommandBindings> CODE-BEHIND public static RoutedUICommand ChangeTextboxValue = new RoutedUICommand ("ChangeTextboxValue", "ChangeTextboxValue", typeof(MyPanel)); private void ChangeTextboxValue_Executed(object sender, ExecutedRoutedEventArgs e) { string oldvalue = Convert.ToString(e.Parameter); (((sender as MenuItem).Parent as ContextMenu).PlacementTarget as TextBox).Text = oldvalue; } oldvalue is the value I want the textbox controls value to change to. I am trying to use above code but it gives me the error, 'Object reference not set to an instance of object'. I tried to debug the app and I get ContextMenu as null.. .Any ideas why??

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• How to run a COM .dll on a remote server?

  - by PrgTrdr

  I have a legacy 3rd party COM .dll that is used to provide an Excel-callable interface to a proprietary database product. The .dll runs on the same physical machine as Excel. I have a need to execute the .dll (and the database it is calling) on a remote server while still maintaining simple Excel callability from the client. I'm totally confused by all the different MS technologies that seem to hint there is an easy way to do this. Can someone please point me in the right direction (easier is better)?

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• Switching function states

  - by webzide

  Dear experts, I would like to implement a API of Javascript that sort of resemble a light switch. For instance, there are two buttons on the actual HTML page act as the UI. Both of the buttons have event handlers that invokes a different function. Each function have codes that act like a state, for instance. button1.onclick=function (){ $("div").click( //code effects 2 ) } button2.onclick=function (){ $("div").click( //Code effects 2 ) } I the code works fine on the surface but the 2 state functions overlap. the effects is going to take place for the rest of the way until the next reload of the document. Basically what I want to achieve is that when 1 button is clicked, it will switch "OFF" the state of function invoked by the other button and vice versa. Thus, the effects achieved are unique are not overlapped. Is there anyway to achieve this or could any experts point me to the right direction. Thanks in advance.

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• I have three different websites and I want to create a single entry point for all of them but how?

  - by austin powers

  Hi all, We are creating three different websites using asp.net but for the user part we want to implement an approach so that each user only need to create an account in any of these three sites but use the same account in other websites too. here is what I've suggested : create a useracount.website.com server then put the sql server there and implement core user account library there such as (creating/editing/etc...) whenever a visitor needs to have an account or needs to login into out sites then we will redirect him to the useracount.website.com address and he/she should login from that point. and for the maintaining the user's states I've suggested to using cookies. and all of these scenarios should be implemented by asp.net and sql. please let me know with best approach cause I feel mine is not that good specially the cookie part. cheers.

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• When we run an aspx page with client side scripting on IIS, we get an ActiveX control error?

  - by Ananya

  we have implemented the code for installing the messenger theme pack using the client side scripting in a web page. We are creating an object of the messenger using the classid .Using this object we call the installcontent() method and try to install the messenger theme pack hosted at following path: http://www.messengerexpressions.com/assets/worldCup/cabs/en-gb.cab Our code initially checks whether the messenger is installed on the user machine or not. Then it checks for the user login ,once the messenger is installed on the machine. And if the user is signed-in , the messenger theme pack is installed. The code currently when hosted on IIS checks the “Sign-In of the user” but when it tries to install the theme pack an error is thrown “An ActiveX control on this page is unsafe.Your current security settings prohibit running unsafe control on this page.As a result,this page may not be display as intended.” Please let us know if any setting is required on IIS for running this piece of codeor anything that we are missing out.

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• Is there a size limitation for an Access DB destination in SSIS?

  - by Adam V

  I'm creating an SSIS package, which will read through a user's SQL database and populate the tables in an Access database. However, for the largest user databases, I start getting errors around the time the Access file reaches approx. 2 GB. Has anyone run into this problem? Is this a size limitation for this operation? More information: I'm getting the error code 0xC020907B, but no additional information that I can see. Error: 0xC0209029 at , [733]: SSIS Error Code DTS_E_INDUCEDTRANSFORMFAILUREONERROR. The "input "OLE DB Destination Input" (746)" failed because error code 0xC020907B occurred, and the error row disposition on "input "OLE DB Destination Input" (746)" specifies failure on error. An error occurred on the specified object of the specified component. There may be error messages posted before this with more information about the failure.

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• I don't get this C/C++ Joke

  - by Buttercup

  After reading this article on thedailywtf.com, I'm not sure that I really got the joke. It says there that some guy changed the code from int function() { int x; char data_string[15]; ... x = 2; strcpy(data_string,"data data data"); ... } to int function() { int x = 2; char data_string[15] = "data data data"; ... } everywhere in the code and that for some reason did inflate the size of the executable from 1 to 2 CDs (or maybe it didn't do that?). Obviously I'm not familiar enough with C/C++ to get this joke, but what seems strangest is that the 2nd code listing seems "cleaner"—at least from what I've been told in school (that is that initializing variables is a good thing, not a bad one).

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• Good overview tool / board for visualizing Subversion branch acitivity?

  - by Sam

  Our team is sometimes finding it a bit confusing and time-consuming to figure out which subversion operations have been perrformed on our different branches in Subversion. Example, when has the Development branch last been merged into the Trunk? When was this particular Tag created, based on what branch etc etc. All of this information can of course be extracted from the Subversion Log, but thats always a manual, time-consuming and error-prone process. Simplest solution seems to be a simple whiteboard with a visualization of all the different branches/tags/trunk in Subversion and people drawing on it, whenever something significant happens. But we're not averse to finding some kind of a digital solution as well, stored centrally. Obviously both systems depend on people actually maintaining the model, but you'll always more or less have that. What do you use as best practice for keeping a clear view on all Subversion operations in the current Sprint (or beyond)?

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• Trying to dynamically expand different divs with one function

  - by Matt Nathanson

  I'm trying to be able to dynamically expand / collapse multiple divs with the same code.... it's controlled with the click of a span (toggle) and then i'm trying to get the next id(the div that would slide up and down) $('span').toggle( function() { $('#albumholder').slideToggle(600); $(this).html('-');}, function() { $('#albumholder').slideToggle(600); $(this).html('+');} ); This code works to expand 1 div... but assume i have a divs #downloadholder#linksholderetc... How can i achieve the same effect with the same code? Thanks!

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• sharepoint spweb and spsite disposal

  - by user327045

  I've been using the following code in a .NET 1.1 SharePoint 2003 environment and it works great: try { site = SPControl.GetContextSite(Context); web = site.OpenWeb(); ... } catch (Exception export) { output.Write("Caught Exception: <br/><br/>"); output.Write(export.Message + "<br><br>"); output.Write(export.StackTrace); } finally { if (web != null) web.Dispose(); if (site != null) site.Dispose(); } However, I'm currently porting the code to a .NET 2.0 SharePoint 2007 environment and I get the following error message: "Trying to use an SPWeb object that has been closed or disposed and is no longer valid." If I comment out the Dispose() code, it works fine. But won't this cause memory leaks? What's the best way to fix the problem?

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• template static classes across dynamic linked libraries

  - by user322274

  Hello, I have a templated class with a static value, like this: template <class TYPE> class A{ static TYPE value; }; in the code of a dll I assign the static value: code of DLL_1 A<float>::value = 2.0; I wish the value to be shared by all the dlls I'm using, i.e. I want that: code of DLL_2 printf("value on DLL_2 %f",A<float>::value); print out "2.0" any clues? thx

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• Appending target="_blank" to links in an iframe without using <body onload>

  - by CincauHangus

  I'm trying to change the links in an iframe to load in a new window instead of the iframe itself. Currently I use this code in head: $(document).ready(function() { var oIFrame = document.getElementById("iframeID"); var oDoc = (oIFrame.contentWindow || oIFrame.contentDocument); if(oDoc.document) oDoc = oDoc.document; var links = oDoc.getElementsByTagName("a"); for(var i=0; i<links.length; i++) { links[i].target="_blank"; } }); However, the code above is triggered before the iframe is fully loaded with its contents. I know this code would work if it's triggered in the body onload attribute, but I'd like to avoid that method and implement it in a function or a file instead.

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• Javascript: sort objects

  - by tom

  function Player() { var score; this.getScore = function() { return score; } this.setScore = function(sc) { score = sc; } } function compare(playerA, playerB) { return playerA.getScore() - playerB.getScore(); } var players = []; players['player1'] = new Player(); players['player2'] = new Player(); Array(players).sort(compare); I have code that is similar to the above. When I step through the code with a debugger, the compare function never gets called and the array isn't sorted. I'm not sure what's wrong with my code?

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• Porting library from Java to Python

  - by Mike Griffith

  I'm about to port a smallish library from Java to Python and wanted some advice (smallish ~ a few thousand lines of code). I've studied the Java code a little, and noticed some design patterns that are common in both languages. However, there were definitely some Java-only idioms (singletons, etc) present that are generally not-well-received in Python-world. I know at least one tool (j2py) exists that will turn a .java file into a .py file by walking the AST. Some initial experimentation yielded less than favorable results. Should I even be considering using an automated tool to generate some code, or are the languages different enough that any tool would create enough re-work to have justified writing from scratch? If tools aren't the devil, are there any besides j2py that can at least handle same-project import management? I don't expect any tool to match 3rd party libraries from one language to a substitute in another.

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• How to release a string created inside a method in iphone?

  - by Warrior

  I have declared a local string inside the method.I am releasing the string inside the same method.I found my code crashing if release that object.If i dont release the string,code runs successfully.I have called that method in viewdidappear so that method is called while pushing and poping.Nothing gets printed in the console. Here is my code -(void)appendString{ NSString *locStr = [[NSString alloc] initWithString:@""]; for (int i=0;i<[result count]; i++) { locStr=[locStr stringByAppendingFormat:@"%@",[result objectAtIndex:i]]; } [str setString:locStr]; [locStr release]; } I am calling the "appendString" method from "viewDidAppear"."str" is a NSMutable string declared in .h class.How should i release the "locStr" .Please help me out

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• How to replace the image ?

  - by master123

  Below code displays the tree structure.When i click on the image Pic.gif,it has to get replaced by new image.Similarly pic1.gif to new image,pic6.gif to new image.Can you help mw with the code where exactly it fits in this code ???? var children = [{ text: 'family', icon: 'pic1.gif', children: [{ text: 'parent1', icon: 'pic2.gif', children: [{ icon: 'pic3.gif', text: 'children1', leaf: true}, { icon: 'pic4.gif', text: 'children2', leaf: true}, { icon: 'pic5.gif', text: 'children3', leaf: true}]}], }, { text: 'Parent2', icon: 'pic6.gif', children: [{ icon: 'pic7.gif', text: 'children4', leaf: true}, { icon: 'pic8.gif', text: 'children5', leaf: true}, { icon: 'pic9.gif', text: "children6", leaf: true}]}]; Ext.onReady(function() { var tree = new Ext.tree.TreePanel({ loader: new Ext.tree.TreeLoader(), width: 1000, height: 1000, renderTo: Ext.getBody(), root: new Ext.tree.AsyncTreeNode({ expanded: false, leaf: false, icon: 'pic.gif' , text: 'Head', children: children }) }); });

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• JPA atomic query/save for multithreaded app

  - by TofuBeer

  I am in the midst of changing my JPA code around to make use of threads. I have a separate entity manager and transaction for each thread. What I used to have (for the single threaded environment) was code like: // get object from the entity manager X x = getObjectX(jpaQuery); if(x == null) { x = new X(); x.setVariable(foo); entityManager.persist(x); } With that code in the multi threaded environment I am getting duplicate keys since, I assume, getObjectX returns null for a thread, then that thread is swapped out, the next thread calls getObjextX, also getting null, and then both threads will create and persist a new X(). Short of adding in synchronization, is there an atomic way to get/save-if-doesn't-exist a value with JPA or should I rethink my approach EDIT: I am using the latest Eclipselink and MySql 5.1

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• F#: Can't hide a type abbreviation in a signature? Why not?

  - by Nels Beckman

  In F#, I'd like to have what I see as a fairly standard Abstract Datatype: // in ADT.fsi module ADT type my_Type // in ADT.fs module ADT type my_Type = int In other words, code inside the module knows that my_Type is an int, but code outside does not. However, F# seems to have a restriction where type abbreviations specifically cannot be hidden by a signature. This code gives a compiler error, and the restriction is described here. If my_Type were instead a discriminated union, then there is no compiler error. My question is, why the restriction? I seem to remember being able to do this in SML and Ocaml, and furthermore, isn't this a pretty standard thing to do when creating an abstract datatype? Thanks

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• How to check if a process is running or got segfaulted or terminated in linux from its pid in my mai

  - by rkbang

  Hello all, I am invoking several processes in my main and I can get the pid of that processes. Now I want to wait until all this processes have been finished and then clear the shared memory block from my parent process. Also if any of the process not finished and segfaulted I want to kill that process. So how to check from the pid of processes in my parent process code that a process is finished without any error or it gave broke down becoz of runtime error or any other cause, so that I can kill that process. Also what if I want to see the status of some other process which is not a child process but its pid is known. Code is appreciated( I am not looking for script but code ).

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• Does any language have a while-else flow structure?

  - by dotancohen

  Consider this flow structure which I happen to use often: if ( hasPosts() ) { while ( hasPosts() ) { displayNextPost(); } } else { displayNoPostsContent(); } Are there any programming languages which have an optional else clause for while, which is to be run if the while loop is never entered? Thus, the code above would become: while ( hasPosts() ) { displayNextPost(); } else { displayNoPostsContent(); } I find it interesting that many languages have the do-while construct (run the while code once before checking the condition) yet I have never seen while-else addressed. There is precedent for running an N block of code based on what was run in N-1 block, such as the try-catch construct. I wasn't sure whether to post here or on programmers.SE. If this question is more appropriate there, then please move it. Thanks.

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• Windows equivalent of inb(), outb(), low level i/o

  - by Sebastian Dwornik

  I have some Linux code that monitors our hardware by collecting temperatures, voltages, and fan speeds, from the motherboard using inb(), outb(), inl(), etc. low level i/o functions. My challenge is to port that code over to run under Windows as a simple console app. But am puzzled in what functions Win32 (or .NET) provide that allow me permission to access direct memory mapped ports. I don't want to code a system driver either. My Windows tool preference is VS2008. (fyi) Is this possible?

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