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  • Go — variadic parameter functions weirdness

    - by ivanzoid
    I'm trying to write simple fmt.Printf wrapper which takes variable number of arguments, here is the code: func Die(format string, args ...interface{}) { str := fmt.Sprintf(format, args) fmt.Fprintf(os.Stderr, "%v\n", str) os.Exit(1) } But when I'm calling it: Die("foo") I get: foo%!(EXTRA []interface {}=[]) Can't figure why I'm getting this text after the "foo" & what is the correct way to create wrappers around fmt.Fprintf?

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  • .NET application per-machine/per-user licensing

    - by MainMa
    I am about to implement a very basic licensing feature for my application. A serial number may be granted per-machine (or per-operating-system) or per-user (as for CAL in Windows Server: if my application is used by several users on one machine or if it is used by one user on several machines). For per-operating-system licensing, I use SerialNumber of Win32_OperatingSystem. For per-user licensing, I use: WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent(); if (currentIdentity != null) { SecurityIdentifier userSid = currentIdentity.User.AccountDomainSid; Console.WriteLine(userSid); } A hash of an obtained OS serial number or SID is then stored in the database, associated with application serial; each time the program starts, it queries the server, sending hash of OS SN/SID and application serial. Is it a right thing to do it or is it completely wrong? Will it work on every Windows machine? (For example, using motherboard serial is wrong)

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  • User signup in REST API

    - by Bhaktavatsalam Nallanthighal
    I have a PHP web application that I want to make accessible across multiple clients. So, I'm trying to make it more like an API. My question is: How would I handle the creation of new users using the API? If I have a URL like http://example.com/user/signup which takes new user details and creates a new user via a POST request, wouldn't it be a problem that people can misuse it and create fake users easily?

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  • detachEvent not working with named anonymous functions

    - by Polshgiant
    I ran into a problem in IE8 today (Note that I only need to support IE) that I can't seem to explain: detachEvent wouldn't work when using a named anonymous function handler. document.getElementById('iframeid').attachEvent("onreadystatechange", function onIframeReadyStateChange() { if (event.srcElement.readyState != "complete") { return; } event.srcElement.detachEvent("onreadystatechange", onIframeReadyStateChange); // code here was running every time my iframe's readyState // changed to "complete" instead of only the first time }); I eventually figured out that changing onIframeReadyStateChange to use arguments.callee (which I normally avoid) instead solved the issue: document.getElementById('iframeid').attachEvent("onreadystatechange", function () { if (event.srcElement.readyState != "complete") { return; } event.srcElement.detachEvent("onreadystatechange", arguments.callee); // code here now runs only once no matter how many times the // iframe's readyState changes to "complete" }); What gives?! Shouldn't the first snippet work fine?

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  • Passing methods/functions as args in Objective C

    - by Baishampayan Ghose
    Hello, I am new to Objective C and I am trying to implement an async library which works with callbacks. I need to figure out a way to pass callback methods as args to my async methods so that the callback can be invoked when the task is finished. What is the best way to achieve this in Objective C? In Python, for example I could easily pass a function, but in Objective C it seems selectors are the way to go(?). Can anyone point me to an example from where I can get some ideas? Thanks in advance.

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  • Remaking this loop by user?

    - by Elliot
    I'm wondering if theres a best practice for what I'm trying to accomplish... First we have the model categories, categories, has_many posts. Now lets say, users add posts. Now, I have a page, that I want to display only the current user's posts by category. Lets say we have the following categories: A, B, and C User 1, has posted in Categories A and B. In my view I have something like: <% @categories.select {|cat| cat.posts.count > 0}.each do |category| %> <%= category.name %><br/> <% category.posts.select {|post| post.user == current_user}.each do |post| %> <%= post.content %><br/> <% end %> <% end %> For the most part its almost there. The issue is, it will still show an empty category if any posts have been entered in it at all (even if the current user has not input posts into that category. So the question boils down to: How do I make the following loop only count posts in the category from the current user? <% @categories.select {|cat| cat.posts.count 0}.each do |category| % Best, Elliot

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  • scala currying by nested functions or by multiple parameter lists

    - by Morgan Creighton
    In Scala, I can define a function with two parameter lists. def myAdd(x :Int)(y :Int) = x + y This makes it easy to define a partially applied function. val plusFive = myAdd(5) _ But, I can accomplish something similar by defining and returning a nested function. def myOtherAdd(x :Int) = { def f(y :Int) = x + y f _ } Cosmetically, I've moved the underscore, but this still feels like currying. val otherPlusFive = myOtherAdd(5) What criteria should I use to prefer one approach over the other?

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  • C# Encryption Functions

    - by KHALID
    i have table in my database that have senestive data such as password field i want to encrypt data before inserting it to table and then i want not to decrypt data but i want only to compare encrypted password with the input password without decrypting

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  • Understanding byte order and functions like CFSwapInt32HostToBig

    - by Typeoneerror
    I've got an enumeration in my game. A simple string message with an appended PacketType is being sent with the message (so it knows what to do with the message) over GameKit WIFI connection. I used Apple's GKRocket sample code as a starting point. The code itself is working fantastically; I just want to understand what the line with CFSwapInt32HostToBig is doing. What on earth does that do? and why does it need to do it? My guess is that it's making sure the PacketType value can be converted to an unsigned integer so it can send it reliably, but that doesn't sound all that correct to me. The documentation states "Converts a 32-bit integer from big-endian format to the host’s native byte order." but I don't understand what the means really. typedef enum { PacketTypeStart, // packet to notify games to start PacketTypeRequestSetup, // server wants client info PacketTypeSetup, // send client info to server PacketTypeSetupComplete, // round trip made for completion PacketTypeTurn, // packet to notify game that a turn is up PacketTypeRoll, // packet to send roll to players PacketTypeEnd // packet to end game } PacketType; // .... - (void)sendPacket:(NSData *)data ofType:(PacketType)type { NSLog(@"sendPacket:ofType(%d)", type); // create the data with enough space for a uint NSMutableData *newPacket = [NSMutableData dataWithCapacity:([data length]+sizeof(uint32_t))]; // Data is prefixed with the PacketType so the peer knows what to do with it. uint32_t swappedType = CFSwapInt32HostToBig((uint32_t)type); // add uint to data [newPacket appendBytes:&swappedType length:sizeof(uint32_t)]; // add the rest of the data [newPacket appendData:data]; // Send data checking for success or failure NSError *error; BOOL didSend = [_gkSession sendDataToAllPeers:newPacket withDataMode:GKSendDataReliable error:&error]; if (!didSend) { NSLog(@"error in sendDataToPeers: %@", [error localizedDescription]); } }

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  • Mapping functions of 2D numpy arrays

    - by perimosocordiae
    I have a function foo that takes a NxM numpy array as an argument and returns a scalar value. I have a AxNxM numpy array data, over which I'd like to map foo to give me a resultant numpy array of length A. Curently, I'm doing this: result = numpy.array([foo(x) for x in data]) It works, but it seems like I'm not taking advantage of the numpy magic (and speed). Is there a better way? I've looked at numpy.vectorize, and numpy.apply_along_axis, but neither works for a function of 2D arrays. EDIT: I'm doing boosted regression on 24x24 image patches, so my AxNxM is something like 1000x24x24. What I called foo above applies a Haar-like feature to a patch (so, not terribly computationally intensive).

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  • Reusing xalan transformer causing its extension functions break

    - by Leslie Norman
    I am using xalan 2.7.1 to validate my xml docs with xslt style sheet. It works fine for the first document and returns error message in case of error along with correct line and column number of xml source by making use of NodeInfo.lineNumber and NodeInfo.columnNumber extensions. The problem is when I try to reuse transformer to validate other xml docs, it successfully transforms the document but always returns lineNumber=columnNumber=-1 for all errors. Any idea? Here is my code: TransformerFactory tFactory = TransformerFactory.newInstance("org.apache.xalan.processor.TransformerFactoryImpl", null); tFactory.setAttribute(TransformerFactoryImpl.FEATURE_SOURCE_LOCATION, Boolean.TRUE); StreamSource xsltStreamSource = new StreamSource(new File("E:\\Temp\\Test\\myXslt.xsl")); Transformer transformer=null; try { transformer = tFactory.newTransformer(xsltStreamSource); ByteArrayOutputStream outStream = new ByteArrayOutputStream(); File srcFolder = new File("E:\\Temp\\Test"); for (File file :srcFolder.listFiles()) { if (file.getName().endsWith("xml")) { transformer.transform(new StreamSource(file), new StreamResult(outStream)); transformer.reset(); } } System.out.println(outStream.toString()); } catch (TransformerException e) { e.printStackTrace(); } Edit: New code after implementing @rsp suggestions: package mycompany; import java.io.File; import javax.xml.transform.ErrorListener; import javax.xml.transform.Source; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.stream.StreamResult; import javax.xml.transform.stream.StreamSource; import org.apache.xalan.processor.TransformerFactoryImpl; public class XsltTransformer { public static void main(String[] args) { TransformerFactory tFactory = TransformerFactory.newInstance("org.apache.xalan.processor.TransformerFactoryImpl", null); tFactory.setAttribute(TransformerFactoryImpl.FEATURE_SOURCE_LOCATION, Boolean.TRUE); StreamSource xsltStreamSource = new StreamSource(new File("E:\\Temp\\Test\\myXslt.xsl")); try { Transformer transformer = tFactory.newTransformer(xsltStreamSource); File srcFolder = new File("E:\\Temp\\Test"); for (File file : srcFolder.listFiles()) { if (file.getName().endsWith("xml")) { Source source = new StreamSource(file); StreamResult result = new StreamResult(System.out); XsltTransformer xsltTransformer = new XsltTransformer(); ErrorListenerImpl errorHandler = xsltTransformer.new ErrorListenerImpl(); transformer.setErrorListener(errorHandler); transformer.transform(source, result); if (errorHandler.e != null) { System.out.println("Transformation Exception: " + errorHandler.e.getMessage()); } transformer.reset(); } } } catch (TransformerException e) { e.printStackTrace(); } } private class ErrorListenerImpl implements ErrorListener { public TransformerException e = null; public void error(TransformerException exception) { this.e = exception; } public void fatalError(TransformerException exception) { this.e = exception; } public void warning(TransformerException exception) { this.e = exception; } } }

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  • Custom Windows Forms Control not exporting functions, not showing in tools list, showing as Text

    - by flavour404
    Hi, I have written a very simple control. C# Visual Studio 2008. Its output should be, and is a dll. I have added a reference to the dll within the project that I intend to use it with. The msdn article about how to write a control states that it should appear in the 'Add reference / projects' list, which it doesn't but I simply navigated to it under the 'browse' tab, went to the /bin folder and added the reference that way. I dragged it over to my toolbox, but it shows up as a 'Text:xhair_tool' and when i try and add it to a form, it won't, so what have I done wrong? It was created as a 'Windows forms control' project. It should export the one method which is 'Target' which return an array, as shown below. using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Text; using System.Windows.Forms; namespace xhair_tool { public partial class xhair : UserControl { public xhair() { InitializeComponent(); } private void xhair_Load(object sender, EventArgs e) { } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; Pen pen = new Pen(Color.Black, 1); SolidBrush redBrush = new SolidBrush(Color.Red); g.DrawLine(pen, 8, 0, 8, 7); g.DrawLine(pen, 8, 9, 8, 16); g.DrawLine(pen, 0, 8, 7, 8); g.DrawLine(pen, 9, 8, 16, 8); //ControlPaint.DrawReversibleLine(start, end, backColor) } /// <summary> /// Returns the point at the center of the crosshair /// </summary> /// <returns>int[x,y]</returns> public int[] Target { get { int[] _xy = new int[2]; _xy[0] = this.Left + 8; _xy[1] = this.Top + 8; return _xy; } } } } Thanks, R.

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  • user table with javaDB and Hibernate from within grails

    - by Ralf
    let's see if I can ask this in an understandable way... I started with grails and created a domain class called user. As far as I understand, Hibernate is used to map this domain class to the database. This works pretty fine with hsqldb. Now I tried to switch to javaDB and get an error message because the table is called "user" (which seems to be a reserved word for javaDB). So a statement like create table user ... will result in an error message. create table "user" ... works, but Hibernate seems not put put the table name in quotes. How can I configure Hibernate to use quotes in order to make it work with my table name? PS: yes, I know, I could map the domain class to another table name... :-)

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  • best practices - multiple functions vs single function with switch case

    - by Amit
    I have a situation where I need to perform several small (but similar) tasks. I can think of two ways to achieve this. First Approach: function doTask1(); function doTask2(); function doTask3(); function doTask4(); Second Approach: // TASK1, TASK2, ... TASK4 are all constants function doTask(TASK) { switch(TASK) { case TASK1: // do task1 break; case TASK2: // do task2 break; case TASK3: // do task3 break; case TASK4: // do task4 break; } } A few more tasks may be added in future (though the chances are rare. but this cannot be ruled out) Please suggest which of the two approaches (or if any other) is a best practice in such a situation.

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  • Scoping inside Javascript anonymous functions

    - by DCD
    I am trying to make a function return data from an ajax call that I can then use. The issue is the function itself is called by many objects, e.g.: function ajax_submit (obj) { var id = $(obj).attr('id'); var message = escape ($("#"+id+" .s_post").val ()); var submit_string = "action=post_message&message="+message; $.ajax({ type: "POST", url: document.location, data: submit_string, success: function(html, obj) { alert (html); } }); return false; } Which means that inside the anonymous 'success' function I have no way of knowing what the calling obj (or id) actually are. The only way I can think of doing it is to attach id to document but that just seems a bit too crude. Is there another way of doing this?

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  • calling Greasemonkey functions from web page

    - by well son
    Hi Can I call function() of my custom Greasemonkey from my page? For example, I created a GM script that contains do_this() function. I want my-web-site.com call the do_this() function. But I can't. I know, I can by doing unsafeWindow.do_this() but doing so prevents me from calling GM_xmlhttpRequest(). Any ideas?

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  • SQL Server 2008 database engine login failed for administrator user in windows 7

    - by Sadegh
    I installed SQL Server 2008 Enterprise Edition on Windows 7 Ultimate from sadegh user. This account exists in administrators role. after a few days I removed sadegh user from Windows and now I am using administrator user. But I can't login to SQL Server database engine using Windows authentication method and I receive this error message: TITLE: Connect to Server Cannot connect to SADEGH-PC. ADDITIONAL INFORMATION: Login failed for user 'Sadegh-PC\Administrator'. (Microsoft SQL Server, Error: 18456) For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=18456&LinkId=20476 please help me! thanks

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  • user table with javaDB and hybernate from within grails

    - by Ralf
    let's see if I can ask this in an understandable way... I started with grails and created a domain class called user. As far as I understand, hybernate is used to map this domain class to the database. This works pretty fine with hsqldb. Now I tried to switch to javaDB and get an error message because the table is called "user" (which seems to be a reserverd word for javaDB). So a statement like create table user ... will result in an error message. create table "user" ... works, but hybernate seems not put put the table name in quotes. How can I configure hybernate to use quotes in order to make it work with my table name? PS: yes, I know, I could map the domain class to another table name... :-)

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  • D callbacks in C functions

    - by Caspin
    I am writing D2 bindings for Lua. This is in one of the Lua header files. typedef int (*lua_CFunction) (lua_State *L); I assume the equivalent D2 statement would be: extern(C) alias int function( lua_State* L ) lua_CFunction; Lua also provides an api function: void lua_pushcfunction( lua_State* L, string name, lua_CFunction func ); If I want to push a D2 function does it have to be extern(C) or can I just use the function? int dfunc( lua_State* L ) { std.stdio.writeln("dfunc"); } extern(C) int cfunc( lua_State* L ) { std.stdio.writeln("cfunc"); } lua_State* L = lua_newstate(); lua_pushcfunction(L, "cfunc", &cfunc); //This will definitely work. lua_pushcfunction(L, "dfunc", &dfunc); //Will this work? If I can only use cfunc, why? I don't need to do anything like that in C++. I can just pass the address of a C++ function to C and everything just works.

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  • Passing switches to Xcode 3.1 user scripts

    - by MyztikJenz
    I have a user script that would be much more useful if it could dynamically change some of its execution dependent on what the user wanted. Passing simple switches would easily solve this problem but I don't see any way to do it. I also tried embedding a keyword in the script name, but Xcode copies the script to a guid-looking filename before execution, so that won't work either. So does anyone know of a way to call a user script with some sort of argument? (other that the normal %%%var%%% variables) Thanks! EDIT: User scripts are accessible via the script menu in Xcode's menubar (between the Window and Help menus). My question is not about "run script" build phase scripts. My apologies for leaving that somewhat ambiguous.

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