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• Git Diff with Beyond Compare

  - by Avanst

  I have succeeded in getting git to start Beyond Compare 3 as a diff tool however, when I do a diff, the file I am comparing against is not being loaded. Only the latest version of the file is loaded and nothing else, so there is nothing in the right pane of Beyond Compare. I am running git 1.6.3.1 with Cygwin with Beyond Compare 3. I have set up beyond compare as they suggest in the support part of their website with a script like such: #!/bin/sh # diff is called by git with 7 parameters: # path old-file old-hex old-mode new-file new-hex new-mode "path_to_bc3_executable" "$2" "$5" | cat Has anyone else encountered this problem and know a solution to this? Edit: I have followed the suggestions by VonC but I am still having exactly the same problem as before. I am kinda new to Git so perhaps I am not using the diff correctly. For example, I am trying to see the diff on a file with a command like such: git diff main.css Beyond Compare will then open and only display my current main.css in the left pane, there is nothing in the right pane. I would like the see my current main.css in the left pane compared to the HEAD, basically what I have last committed. My git-diff-wrapper.sh looks like this: #!/bin/sh # diff is called by git with 7 parameters: # path old-file old-hex old-mode new-file new-hex new-mode "c:/Program Files/Beyond Compare 3/BCompare.exe" "$2" "$5" | cat My git config looks like this for Diff: [diff] external = c:/cygwin/bin/git-diff-wrapper.sh

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• Design suggestion for expression tree evaluation with time-series data

  - by Lirik

  I have a (C#) genetic program that uses financial time-series data and it's currently working but I want to re-design the architecture to be more robust. My main goals are: sequentially present the time-series data to the expression trees. allow expression trees to access previous data rows when needed. to optimize performance of the data access while evaluating the expression trees. keep a common interface so various types of data can be used. Here are the possible approaches I've thought about: I can evaluate the expression tree by passing in a data row into the root node and let each child node use the same data row. I can evaluate the expression tree by passing in the data row index and letting each node get the data row from a shared DataSet (currently I'm passing the row index and going to multiple synchronized arrays to get the data). Hybrid: an immutable data set is accessible by all of the expression trees and each expression tree is evaluated by passing in a data row. The benefit of the first approach is that the data row is being passed into the expression tree and there is no further query done on the data set (which should increase performance in a multithreaded environment). The drawback is that the expression tree does not have access to the rest of the data (in case some of the functions need to do calculations using previous data rows). The benefit of the second approach is that the expression trees can access any data up to the latest data row, but unless I specify what that row is, I'll have to iterate through the rows and figure out which one is the last one. The benefit of the hybrid is that it should generally perform better and still provide access to the earlier data. It supports two basic "views" of data: the latest row and the previous rows. Do you guys know of any design patterns or do you have any tips that can help me build this type of system? Should I use a DataSet to hold and present the data, or are there more efficient ways to present rows of data while maintaining a simple interface? FYI: All of my code is written in C#.

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• Python byte per byte XOR decryption

  - by neurino

  I have an XOR encypted file by a VB.net program using this function to scramble: Public Class Crypter ... 'This Will convert String to bytes, then call the other function. Public Function Crypt(ByVal Data As String) As String Return Encoding.Default.GetString(Crypt(Encoding.Default.GetBytes(Data))) End Function 'This calls XorCrypt giving Key converted to bytes Public Function Crypt(ByVal Data() As Byte) As Byte() Return XorCrypt(Data, Encoding.Default.GetBytes(Me.Key)) End Function 'Xor Encryption. Private Function XorCrypt(ByVal Data() As Byte, ByVal Key() As Byte) As Byte() Dim i As Integer If Key.Length <> 0 Then For i = 0 To Data.Length - 1 Data(i) = Data(i) Xor Key(i Mod Key.Length) Next End If Return Data End Function End Class and saved this way: Dim Crypter As New Cryptic(Key) 'open destination file Dim objWriter As New StreamWriter(fileName) 'write crypted content objWriter.Write(Crypter.Crypt(data)) Now I have to reopen the file with Python but I have troubles getting single bytes, this is the XOR function in python: def crypto(self, data): 'crypto(self, data) -> str' return ''.join(chr((ord(x) ^ ord(y)) % 256) \ for (x, y) in izip(data.decode('utf-8'), cycle(self.key)) I had to add the % 256 since sometimes x is 256 i.e. not a single byte. This thing of two bytes being passed does not break the decryption because the key keeps "paired" with the following data. The problem is some decrypted character in the conversion is wrong. These chars are all accented letters like à, è, ì but just a few of the overall accented letters. The others are all correctly restored. I guess it could be due to the 256 mod but without it I of course get a chr exception... Thanks for your support

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• Java get user details

  - by LC

  I'm new to Java and I have to write a program to get user details which appear like this: Author’s Details **************** Name: J. Beans YOB: 1969 Age: 41 Book Details ************ Title: *Wonderful Java* ISBN: *978 0 470 10554 9* Publisher: *Wiley* This is what I've done but it does not work, can anyone help me to find out the problem ? import java.util.Scanner ; public class UserDetails { public static void main(String args[]) { System scan = new Scanner(System.in); input sname, fname, born, title, isbn, publisher; System.out.print("Please enter author's surname:"); sname = input.nextLine(); System.out.print("Please the initial of author's first name:"); fname = input.nextLine(); System.out.print("Please enter the year the author was born:"); born = input.nextLine(); System.out.print("Please enter the author's book title:"); title = input.nextLine(); System.out.print("Please enter the book's ISBN:"); isbn = input.nextLine(); System.out.print("Please enter the publisher of the book:"); publisher = input.nextLine; System.out.println("Author's detail"); System.out.println("**********************"); System.out.println("Name:" + fname + sname); System.out.println("YOB:" + born); System.out.println("Age" + born); System.out.println("Book Details"); System.out.println("**********************"); System.out.println("Title:" + "*" + title + "*"); System.out.println("ISBN:" + "*" + isbn + "*"); System.out.println("Publisher:" + "*" + publisher + "*"); } }

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• Can someone copyright an SQL query?

  - by Samutz

  I work for a school district. Every year we have to export a list of students from our student management system and send it to a company that handles our online exams. So to do this export, we had to hire someone who knew the inner workings of our student management system. He wrote an sql (Adaptive Sybase SQL Anywhere) query to export the students to a csv file like we needed. This was before I started working for the district, so for a while I assumed this was an actually application, until it came time for me to do the export myself. And every year he charges us $500 to update this query to export the students for the current year. So when I discovered it was only a query (.bat file and .sql file), my thought was "I can update this myself". All I have to do is change the years in the query (eg. 2009 to 2010). The query (.sql file) itself has this comment at the top: // This code was writtend by [the guy] // and is the property of [his company]...Copyright 2005,2006,2008,2009 // This code MAY NOT BE USED without the expressed written consent of // [his company]. (Yes, it really does says "writtend".) So now my boss is worried that we're violating the copyright. And that the guy is gonna find out that I updated the query myself because we haven't asked him to update it this year and take legal action. So back to the subject's question: Can he really copyright this query? And if so, is modifying it ourselves a copyright violation? In my mind, a single query isn't program code. It's more a command line command. But I don't know what it's considered legally.

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• A very weird problem with localization (ASP.NET MVC)

  - by Alex

  I'm using Web Developer 2010. I just created a resource file lang.resx with different values in english. Then I created a lang.FR-fr.resx with French equivalents. However after tryingto compile, I get Error 131 Task could not find "AL.exe" using the SdkToolsPath "C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\" or the registry key "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v7.0A". Make sure the SdkToolsPath is set and the tool exists in the correct processor specific location under the SdkToolsPath and that the Microsoft Windows SDK is installed This is so weird! If I remove FR-fr part, it will work, but there will be no translation of course. I went to that directory and found out that I don't have al.exe there. I managed to find it in .NET 2 folder, but after copying it didn't help. It throws an exception. I tried to reinstall .NET 4, to install Windows SDK, and it still doesn't work. Maybe I can somehow get this al.exe file?

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• Rendering LaTeX on third-party websites?

  - by A. Rex

  There are some sites on the web that render LaTeX into some more readable form, such as Wikipedia, some Wordpress blogs, and MathOverflow. They may use images, MathML, jsMath, or something like that. There are other sites on the web where LaTeX appears inline and is not rendered, such as the arXiv, various math forums, or my email. In fact, it is quite common to see an arXiv paper's abstract with raw LaTeX in it, e.g. this paper. Is there a plugin available for Firefox, or would it be possible to write one, that renders LaTeX within pages that do not provide a rendering mechanism themselves? (The LaTeX would be enclosed within dollar signs, e.g. $\pi$. See the arXiv link above.) Some notes: It may be impossible to render some of the code, because authors often copy-paste code directly from their source TeX files, which may contain things like "\cite{foo}" or undefined commands. These should be left alone. This question is a repost of a question from MathOverflow that was closed for not being related to math. There is one answer there, which is helpful, but perhaps Stack Overflow can provide better answers. I program a lot, but Javascript is not my specialty, so comments along the lines of "look at this library" are not particularly helpful to me (but may be to others).

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• Interfaces with structs, by reference using Generics

  - by Fraga

  I can't pass by reference an interface with a struct in it, what am I doing wrong? Here is the example code: class Processor<T> where T : new() { public Processor() { Data = new T(); } public T Data; } class PeriodsProcessor : Processor<Periods> { public PeriodsProcessor() { DataBase DB = new DataBase(); Console.WriteLine(Data.Value); DB.ModifyData<Period>(Data); Console.WriteLine(Data.Value); Console.ReadLine(); } } public class Period { public string Name; } public interface IDataTable<T> { string Value { get; set; } T Filter { get; set; } } [Serializable] public struct Periods : IDataTable<Period> { public string Value { get; set; } public Period Filter { get; set; } } public class DataBase { public void ModifyData<T>(IDataTable<T> data) where T : new() { data.Value = "CHANGE"; } } class Program { static void Main(string[] args) { PeriodsProcessor PeriodsProcessor = new PeriodsProcessor(); } }

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• How to scan convert right edges and slopes less than one?

  - by Zachary

  I'm writing a program which will use scan conversion on triangles to fill in the pixels contained within the triangle. One thing that has me confused is how to determine the x increment for the right edge of the triangle, or for slopes less than or equal to one. Here is the code I have to handle left edges with a slope greater than one (obtained from Computer Graphics: Principles and Practice second edition): for(y=ymin;y<=ymax;y++) { edge.increment+=edge.numerator; if(edge.increment>edge.denominator) { edge.x++; edge.increment -= edge.denominator; } } The numerator is set from (xMax-xMin), and the denominator is set from (yMax-yMin)...which makes sense as it represents the slope of the line. As you move up the scan lines (represented by the y values). X is incremented by 1/(denomniator/numerator) ...which results in x having a whole part and a fractional part. If the fractional part is greater than one, then the x value has to be incremented by 1 (as shown in edge.incrementedge.denominator). This works fine for any left handed lines with a slope greater than one, but I'm having trouble generalizing it for any edge, and google-ing has proved fruitless. Does anyone know the algorithm for that?

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• C# DllImport with c++ const char* not working correctly

  - by Shammah

  I have the following function in a C++ DLL extern "C" __declspec(dllexport) bool Exist(const char* name) { //if (g_Queues.find(name) != g_Queues.end()) // return true; //else // return false; return false; } Inside my C# class I have the following: [DllImport("Whisper.dll", EntryPoint="Exist", CallingConvention=CallingConvention.Cdecl)] public static extern bool Exist(string name); Yet, whenever I call my function it ALWAYS returns true, even when I commented out my little function and made it return false. I have the feeling there is something wrong with my calling convention or any other issue with P/Invoking my DLL, probably corresponding with the string and const char*, but for now I am completely clueless. What am I doing wrong? Why does it return true instead of false? EDIT: I have figured out this has nothing to do with the const char* or string, because the problem persists with an empty function. I've tried changing the calling convention between Cdecl and StdCall and neither work correctly. I've also managed to debug my DLL and it's being called correctly and does indeed return false, but once back into C# it somehow is true. Changing the CharSet also had no effect. I've made sure I've supplied my C# program with the latest and correct version of my DLL each time, so that shouldn't be an issue aswell. Again, I am completely clueless on why the result is true when I'm in fact returning false. EDIT2: SOReader provided me with a suggestion which fixes another important issue, see my comment. Sadly, it does not fix the return issue.

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• Using TPrinter in Delphi

  - by Milad

  Hello Experts I don't have any backgrounds in programming and this is my first shot. I wrote a Delphi program that is supposed to print on a result sheet. I work in an institute and we have to establish hundreds of result sheets every 2 months. It's really difficult to do that and different handwritings is also an important issue. My problem is that when i write this code : if PrintDialog.Execute() then begin with MyPrinter do begin MyPrinter.BeginDoc();//Start Printing //Prints First Name MyPrinter.Canvas.TextOut(FirstNameX,FirstNameY,EditFirstName.Text); //Prints Last Name MyPrinter.Canvas.TextOut(LastNameX,LastNameY,EditLastName.Text); //Prints Level MyPrinter.Canvas.TextOut(LevelX,LevelY,EditLevel.Text); //Prints Date MyPrinter.Canvas.TextOut(DateX,DateY,MEditDate.Text); //Prints Student Number MyPrinter.Canvas.TextOut(StdNumX,StdNumY,EditStdnumber.Text); .... MyPrinter.EndDoc();//End Printing end; end; I can't get the right coordinates to print properly. Am I missing something? How can I set the right coordinates? You know TPrinter uses pixels to get the coordinates but papers are measured in inches or centimeters. I'm really confused.I appreciate any help. Thanks in advance.

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• AssertionFailure: "null identifier" - FluentNH + SQLServerCE

  - by Stefan

  The code fails at session.Save(employee); with AssertionFailure "null identifier". What am I doing wrong? using FluentNHibernate.Cfg; using FluentNHibernate.Cfg.Db; using FluentNHibernate.Mapping; using NHibernate; using NHibernate.Cfg; using NHibernate.Tool.hbm2ddl; namespace FNHTest { public class Employee { public virtual int Id { get; private set; } public virtual string Name { get; set; } public virtual string Surname { get; set; } } public class EmployeeMap : ClassMap { public EmployeeMap() { Id(e = e.Id); Map(e = e.Name); Map(e = e.Surname); } } public class DB { private static ISessionFactory mySessionFactory = null; private static ISessionFactory SessionFactory { get { if (mySessionFactory == null) { mySessionFactory = Fluently.Configure() .Database(MsSqlCeConfiguration.Standard .ConnectionString("Data Source=MyDB.sdf")) .Mappings(m = m.FluentMappings.AddFromAssemblyOf()) .ExposeConfiguration(BuildSchema) .BuildSessionFactory(); } return mySessionFactory; } } private static void BuildSchema(Configuration configuration) { SchemaExport schemaExport = new SchemaExport(configuration); schemaExport.Execute(false, true, false); } public static ISession OpenSession() { return SessionFactory.OpenSession(); } } public class Program { public static void Main(string[] args) { var employee = new Employee { Name = "John", Surname = "Smith" }; using (ISession session = DB.OpenSession()) { session.Save(employee); } } } }

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• MySQL BinLog Statement Retrieval

  - by Jonathon

  I have seven 1G MySQL binlog files that I have to use to retrieve some "lost" information. I only need to get certain INSERT statements from the log (ex. where the statement starts with "INSERT INTO table SET field1="). If I just run a mysqlbinlog (even if per database and with using --short-form), I get a text file that is several hundred megabytes, which makes it almost impossible to then parse with any other program. Is there a way to just retrieve certain sql statements from the log? I don't need any of the ancillary information (timestamps, autoincrement #s, etc.). I just need a list of sql statements that match a certain string. Ideally, I would like to have a text file that just lists those sql statements, such as: INSERT INTO table SET field1='a'; INSERT INTO table SET field1='tommy'; INSERT INTO table SET field1='2'; I could get that by running mysqlbinlog to a text file and then parsing the results based upon a string, but the text file is way too big. It just times out any script I run and even makes it impossible to open in a text editor. Thanks for your help in advance.

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• Provisioning Api using java

  - by user268515

  Hi i'm working in java and tried to retrieve all the user in the domain for that i used Provisionin api............ Its working good But my idea is to Use 2-legged OAuth to retrieve the users from the domain Is it Possible? I dont how to specify the URL please Help me And i triede the following the program final String CONSUMER_KEY = "xxxxxxxxxx.com"; final String CONSUMER_SECRET = "12345678122154154df9"; final String DOMAIN = "xxxxxxxxxx.com"; GoogleOAuthParameters oauthParameters = new GoogleOAuthParameters(); oauthParameters.setOAuthConsumerKey(CONSUMER_KEY); oauthParameters.setOAuthConsumerSecret(CONSUMER_SECRET); oauthParameters.setOAuthType(OAuthType.TWO_LEGGED_OAUTH); OAuthHmacSha1Signer signer = new OAuthHmacSha1Signer(); URL feedUrl = new URL("https://apps-apis.google.com/a/feeds/" + DOMAIN + "/user/2.0/[email protected]"); userService = new UserService("Myapplication"); userService.setOAuthCredentials(oauthParameters, signer); userService.useSsl(); UserFeed allUsers = new UserFeed(); UserFeed allpage; Link nextLink; do { allpage = userService.getFeed(feedUrl, UserFeed.class); allUsers.getEntries().addAll(allpage.getEntries()); nextLink = allpage.getLink(Link.Rel.NEXT, Link.Type.ATOM); if (nextLink != null) { feedUrl = new URL(nextLink.getHref()); } }while (nextLink != null); return allUsers; } Its returing the error as com.google.gdata.util.AuthenticationException: Unknown authorization header

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• Java and dynamic variables

  - by Arvanem

  Hi folks, I am wondering whether it is possible to make dynamic variables in Java. In other words, variables that change depending on my instructions. FYI, I am making a trading program. A given merchant will have an array of items for sale for various prices. The dynamism I am calling for comes in because each category of items for sale has its own properties. For example, a book item has two properties: int pages, and boolean hardCover. In contrast, a bookmark item has one property, String pattern. Here are skeleton snippets of code so you can see what I am trying to do: public class Merchants extends /* certain parent class */ { // only 10 items for sale to begin with Stock[] itemsForSale = new Stock[10]; // Array holding Merchants public static Merchants[] merchantsArray = new Merchants[maxArrayLength]; // method to fill array of stock goes here } and public class Stock { int stockPrice; int stockQuantity; String stockType; // e.g. book and bookmark // Dynamic variables here, but they should only be invoked depending on stockType int pages; boolean hardCover; String pattern; }

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• how to make a name from random numbers?

  - by blood

  my program makes a random name that could have a-z this code makes a 16 char name but :( my code wont make the name and idk why :( can anyone show me what's wrong with this? char name[16]; void make_random_name() { byte loop = -1; for(;;) { loop++; srand((unsigned)time(0)); int random_integer; random_integer = (rand()%10)+1; switch(random_integer) { case '1': name[loop] = 'A'; break; case '2': name[loop] = 'B'; break; case '3': name[loop] = 'C'; break; case '4': name[loop] = 'D'; break; case '5': name[loop] = 'E'; break; case '6': name[loop] = 'F'; break; case '7': name[loop] = 'G'; break; case '8': name[loop] = 'Z'; break; case '9': name[loop] = 'H'; break; } cout << name << "\n"; if(loop > 15) { break; } } }

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• Flex 3 - Saving an image of a component

  - by Emma

  Im currently trying to work the imageSnapshot function in flex. Ive been looking hard but I cant seem to find a solution to my problem. I wish to take a screenshot of one of my components, to capture the final output of my program, since a plain "printscreen" cuts off some of the output due to it scrolling. My current code looks like - <mx:ApplicationControlBar dock="true"> <mx:Button label="Take snapshot of Profile" click="takeSnapshot();" /> </mx:ApplicationControlBar> Which when called does - private function takeSnapshot(even:Event=null):void { var imageSnap:ImageSnapshot = ImageSnapshot.captureImage(viewstack1); Now i think this is taking the image of the viewstack which I want... But Im stumped on what to do from here! Is it not possible to now just copy the image to the clipboard, or produce a new window in my browser with the entire image inside? If anyone has any other way to do this, suggestions would be wonderful. Thank you for your time.

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• Stack Overflow when debugging application in iPhone simulator

  - by mjdth

  I'm getting this every time I attempt to debug my app in the simulator: [Session started at 2010-05-11 16:16:52 -0500.] GNU gdb 6.3.50-20050815 (Apple version gdb-1467) (Wed Apr 21 06:57:21 UTC 2010) Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "x86_64-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 51573. Program received signal: “EXC_BAD_ACCESS”. Data Formatters temporarily unavailable, will re-try after a 'continue'. (Cannot call into the loader at present, it is locked.) I've looked around and found a few similar cases, but they all seem to be related to a missing file and an extra necessary build phase. I'm getting no notification of a missing file here so I'm not sure where to start to fix this and get the app running again. Thanks for any insight!

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• How To Generate Parameter Set for the Diffie-Hellman Key Agreement Algorithm in Android

  - by sebby_zml

  Hello everyone, I am working on mobile/server security related project. I am now stuck in generating a Diffie-Hellman key agreement part. It works fine in server side program but it is not working in mobile side. Thus, I assume that it is not compactible with Android. I used the following class to get the parameters. It returns a comma-separated string of 3 values. The first number is the prime modulus P. The second number is the base generator G. The third number is bit size of the random exponent L. My question is is there anything wrong with the code or it is not compactible for android?What kind of changes should I do? Your suggestion and guidance would be very much help for me. Thanks a lot in advance. public static String genDhParams() { try { // Create the parameter generator for a 1024-bit DH key pair AlgorithmParameterGenerator paramGen = AlgorithmParameterGenerator.getInstance("DH"); paramGen.init(1024); // Generate the parameters AlgorithmParameters params = paramGen.generateParameters(); DHParameterSpec dhSpec = (DHParameterSpec)params.getParameterSpec(DHParameterSpec.class); // Return the three values in a string return ""+dhSpec.getP()+","+dhSpec.getG()+","+dhSpec.getL(); } catch (NoSuchAlgorithmException e) { } catch (InvalidParameterSpecException e) { } return null; } Regards, Sebby

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• Make winform run away from the mouse.

  - by JACK IN THE CRACK

  Okay so I'm trying to make a little gag program that will "run away" from the mouse. So, to get the mouse coordinates for the whole screen and not just the form control I had to create a little helper: static class MouseHelper { [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetCursorPos(ref Point pt); public static Point GetPosition() { Point w32Mouse = new Point(); GetCursorPos(ref w32Mouse); return w32Mouse; } } Now I thought I was going to use the MouseMove event... but that doesn't work for outside the form control either so I have an auto-enabled timer on a 10ms loop called timerMouseMove. public partial class Form1 : Form { public Form1() { InitializeComponent(); } private bool CollisionCheck() { Point win32Mouse = MouseHelper.GetPosition(); if (win32Mouse.X <= Location.X || win32Mouse.X >= (Location.X + Width)) return false; if (win32Mouse.Y <= Location.Y || win32Mouse.Y >= (Location.Y + Height)) return false; return true; } private void timerMouseMove_Tick(object sender, EventArgs e) { if (CollisionCheck()) Location = new Point(Location.X + 1, Location.Y + 1); } } So this works out nicely, at least I have the collision checking working and whatnot. But now, how should I go about figuring which side of the form the mouse has collided with, so that I can update its location to move in the opposite direction the mouse collides with it? And such halp

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• Zend Framework or CakePHP?

  - by gorzan

  My group is going to attempt to build a new CMS from scratch, designed to serve the needs of our organization. It should be noted that none of us have any formal programming education, but we've picked up this and that from developing different websites, among others the one our community uses now. We've decided to program the new CMS in PHP, with total MVC seperation. Not wanting to re-invent all the little cogs and wheels needed for such a potentially large project as this, we've been looking into using a PHP framework, and some googling and blog-surfing landed us in a discussion: Zend vs Cake? Anyone have any useful input here? Also, any other tips for embarking on this project would be appreciated. (Except for suggestions for existing CMSes, we know they're out there.) EDIT: It seems I was a bit unclear. None of us are NEW to PHP - in fact, we all have fairly extensive experience from previous projects, including the current solution our community's website runs on which we built ourselves. The decision to not use an existing CMS is a very informed one, so although I appreciate all the good suggestions we really are going to do this ourselves. So. Zend vs Cake?

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• What's the Matlab equivalent of NULL, when it's calling COM/ActiveX methods?

  - by David M

  Hi, I maintain a program which can be automated via COM. Generally customers use VBS to do their scripting, but we have a couple of customers who use Matlab's ActiveX support and are having trouble calling COM object methods with a NULL parameter. They've asked how they do this in Matlab - and I've been scouring Mathworks' COM/ActiveX documentation for a day or so now and can't figure it out. Their example code might look something like this: function do_something() OurAppInstance = actxserver('Foo.Application'); OurAppInstance.Method('Hello', NULL) end where NULL is where in another language, we'd write NULL or nil or Nothing, or, of course, pass in an object. The problem is this is optional (and these are implemented as optional parameters in most, but not all, cases) - these methods expect to get NULL quite often. They tell me they've tried [] (which from my reading seemed the most likely) as well as '', Nothing, 'Nothing', None, Null, and 0. I have no idea how many of those are even valid Matlab keywords - certainly none work in this case. Can anyone help? What's Matlab's syntax for a null pointer / object for use as a COM method parameter? Update: Thanks for all the replies so far! Unfortunately, none of the answers seem to work, not even libpointer. The error is the same in all cases: Error: Type mismatch, argument 2 This parameter in the COM type library is described in RIDL as: HRESULT _stdcall OurMethod([in] BSTR strParamOne, [in, optional] OurCoClass* oParamTwo, [out, retval] VARIANT_BOOL* bResult); The coclass in question implements a single interface descending from IDispatch.

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• Can I ignore a SIGFPE resulting from division by zero?

  - by Mikeage

  I have a program which deliberately performs a divide by zero (and stores the result in a volatile variable) in order to halt in certain circumstances. However, I'd like to be able to disable this halting, without changing the macro that performs the division by zero. Is there any way to ignore it? I've tried using #include <signal.h> ... int main(void) { signal(SIGFPE, SIG_IGN); ... } but it still dies with the message "Floating point exception (core dumped)". I don't actually use the value, so I don't really care what's assigned to the variable; 0, random, undefined... EDIT: I know this is not the most portable, but it's intended for an embedded device which runs on many different OSes. The default halt action is to divide by zero; other platforms require different tricks to force a watchdog induced reboot (such as an infinite loop with interrupts disabled). For a PC (linux) test environment, I wanted to disable the halt on division by zero without relying on things like assert.

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• Writing language converter in ANTLR

  - by Stefan

  I'm writing a converter between some dialects of the same programming language. I've found a grammar on the net - it's complex and handles all the cases. Now I'm trying to write the appropriate actions. Most of the input is just going to be rewritten to output. What I need to do is parse function calls, do my magic (rename function, reorder arguments, etc) and write it. I'm using AST as output. When I come across a function call, I build a custom object structure (from classes defined in my target language), call the appropriate function and I have a string that represents the transformed function that I want to get. The problem is, what I'm supposed to do with that string? I'd like to replace the .text attribute of the enclosing rule, but setText() is only available on lexer rules and the rule's .text attribute is read-only. How to solve this problem? program : statement_list { output = $statement_list.text; } ; //... statement : expression_statement // ... ; expression_statement : function_call // ... ; function_call : ID '(' { /* build the object, assign name */ Function function = new Function(); //... } ( arg1 = expression { /* add first parameter */ } ( ',' arg2 = expression { /* add the rest of parameters */ } )* )? ')' { /* convert the function call */ string converted = Tools.Convert(function); // $setText(converted); // doesn't work // $functionCall.text = converted; // doesn't work } ;

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• Embedding Lua functions as member variables in Java

  - by Zarion

  Although the program I'm working on is in Java, answering this from a C perspective is also fine, considering that most of this is either language-agnostic, or happens on the Lua side of things. In the outline I have for the architecture of a game I'm programming, individual types of game objects within a particular class (eg: creatures, items, spells, etc.) are loaded from a data file. Most of their properties are simple data types, but I'd like a few of these members to actually contain simple scripts that define, for example, what an item does when it's used. The scripts will be extremely simple, since all fundamental game actions will be exposed through an API from Java. The Lua is simply responsible for stringing a couple of these basic functions together, and setting arguments. The question is largely about the best way to store a reference to a specific Lua function as a member of a Java class. I understand that if I store the Lua code as a string and call lua_dostring, Lua will compile the code fresh every time it's called. So the function needs to be defined somehow, and a reference to this specific function wrapped in a Java function object. One possibility that I've considered is, during the data loading process, when the loader encounters a script definition in a data file, it extracts this string, decorates the function name using the associated object's unique ID, calls lua_dostring on the string containing a full function definition, and then wraps the generated function name in a Java function object. A function declared in script run with lua_dostring should still be added to the global function table, correct? I'm just wondering if there's a better way of going about this. I admit that my knowledge of Lua at this point is rather superficial and theoretical, so it's possible that I'm overlooking something obvious.

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