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• Guaranteed COM object release?

  - by Jurily

  I wrote the following code under the assumption that Excel will die with Monkey: class ExcelMonkey { private static Excel.Application xl = new Excel.Application(); public static bool parse(string filename) { if (filename.Contains("foo")) { var workbook = xl.Workbooks.Open(filename); var sheet = workbook.Worksheets.get_Item(1); // do stuff return true; } return false; } } How do I make sure it does? Do I need to release workbook and sheet separately? I want to have Excel around for the lifetime of the program, it's a huge performance improvement.

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• How to inject dependencies into a custom UserNamePasswordValidator in WCF?

  - by Dannerbo

  I'm using a UserNamePasswordValidator in WCF along with Unity for my dependency injection, but since WCF creates the instance of the UserNamePasswordValidator, I cannot inject my container into the class. So how would one go about this? The simplest solution I can think of is to create a static proxy/wrapper class around a static instance of a UnityContainer, which exposes all the same methods... This way, any class can access the container, and I don't need to inject it everywhere. So I could just do UnityContainerWrapper.Resolve() anywhere in code. So basically this solution solves 2 problems for me, I can use it in classes that I'm not creating an instance of, and I can use it anywhere without having to inject the container into a bunch of classes. The only downside I can think of is that I'm now potentially exposing my container to a bunch of classes that wouldn't of had access to the container before. Not really sure if this is even a problem though?

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• Looking for suggestions: becoming a hireable, young programmer [closed]

  - by Dan

  I am a 17 year old Java programmer that has filled the last year with learning all of the ins and outs of Java - Using Eclipse, and the help of a friend of the family (a Java programming architect for some company), I have learned everything from serializing objects, basic networking, generics, reflection, multi-threading, code optimization and efficiency & some concurrency safety - built my own proxy class, and nowadays, I answer questions on Project Euler. I am seeking some suggestions though on where I go next, or where I go from here to get a job in programming. I dedicate at least an hour every day to coding, sometimes literally, the entire day, and I really have come to love the process. I just started reading Effective Java (v2), and learning Scala (as I see often, possibly the Java replacement) I will be going to college for Computer Science next year - and taking AP computer science this year (however, I took a practice exam and got an 87, only need a 60to70 to pass, so no need to study for it too much) -- I was wondering if getting the SE 7 OCA and OCP would help me in trying to get a programming job. I looked around and most people have said online that an OCA/OCP are practically useless, but, at my age do they make me any more credible? More or less, what would you recommend to get a job in programming these days - or distinguish yourself from the crowd? I have enough time and dedication to learn another language, or anything really. Thank you very much.

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• How to break the "php is a bad language" paradigm? [closed]

  - by dukeofgaming

  PHP is not a bad language (or at least not as bad as some may suggest). I had teachers that didn't even know PHP was object oriented until I told them. I've had clients that immediately distrust us when we say we are PHP developers and question us for not using chic languages and frameworks such as Django or RoR, or "enterprise and solid" languages such as Java and ASP.NET. Facebook is built on PHP. There are plenty of solid projects that power the web like Joomla and Drupal that are used in the enterprise and governments. There are frameworks and libraries that have some of the best architectures I've seen across all languages (Symfony 2, Doctrine). PHP has the best documentation I've seen and a big community of professionals. PHP has advanced OO features such as reflection, interfaces, let alone that PHP now supports horizontal reuse natively and cleanly through traits. There are bad programmers and script kiddies that give PHP a bad reputation, but power the PHP community at the same time, and because it is so easy to get stuff done PHP you can often do things the wrong way, granted, but why blame the language?. Now, to boil this down to an actual answerable question: what would be a good and solid and short and sweet argument to avoid being frowned upon and stop prejudice in one fell swoop and defend your honor when you say you are a PHP developer?. (free cookie with teh whipped cream to those with empirical evidence of convincing someone —client or other— on the spot) P.S.: We use Symfony, and the code ends being beautiful and maintainable

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• How to design a class for managing file path ?

  - by remi bourgarel

  Hi All In my app, I generate some xml file for instance : "/xml/product/123.xml" where 123 is the product's id and 123.xml contains informations about this product. I also have "/xml/customer/123.xml" where 123.xml contains informations about the client ... 123 How can I manage these file paths : 1/ - I create the file path directly in the seralization method ? 2/ I create 2 static class : CustomerSerializationPathManager and ProductSerializationPathManager with 1 method : getPath(int customerID) and getPath(int productID) 3/ I create one static class : SerializationPathManager with 2 method : getCustomerPath(int customerID) and getProductPath(int productID) 4/ something else I'd prefer the solution 3 cause if I think there's only one reason to change this class : I change the root directory. So I'd like to have your thoughts about it... thx

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• Handling exception form unmanaged dll in C#

  - by StuffHappens

  Hello. I have the following function written in C# public static string GetNominativeDeclension(string surnameNamePatronimic) { if(surnameNamePatronimic == null) throw new ArgumentNullException("surnameNamePatronimic"); IntPtr[] ptrs = null; try { ptrs = StringsToIntPtrArray(surnameNamePatronimic); int resultLen = MaxResultBufSize; int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen); ThrowException(err); return IntPtrToString(ptrs, resultLen); } catch { return surnameNamePatronimic; } finally { FreeIntPtr(ptrs); } } Function decGetNominativePadeg is in unmanaged dll [DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")] private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic, IntPtr result, ref Int32 resultLength); and throws an exception: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. The catch that is in C# code doesn't actually catch it. Why? How to handle this exception? Thank you for your help!

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• Efficiency of while(true) ServerSocket Listen

  - by Submerged

  I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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• Where do I find API key and API secret for Facebook?

  - by Sara

  Trying to connect to Facebook to make a statusupdate through my Android application. Got the whole thing running but I need API key + secret. Where can I create/get a hold of these? private static final String apiKey = "<YOUR API KEY>"; private static final String apiSecret = "<YOUR SECRET KEY>"; Tried the same thing with Twitter and then I just "created" an application and recieved "ConsumerKEY" and "ConsumerSECRET", but what is the deal with Facebook?

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• Oracle Java Olympics Between Russia, Ukraine, Belarus, Ukraine and Kazakhstan

  - by Tori Wieldt

  Last month, 151 universities in 11 locations (Saint-Petersburg, Moscow, Donetsk, Tomsk, Odessa, Rostov-on-Don, Ekaterinburg, Khabarovsk, Almaty, Kiev, and Samara) competed in the second round of the Oracle Java Olympics. For two weeks in February, the best university students from Russia, Ukraine, Belarus, Ukraine and Kazakhstan were invited to compete with each other and prove just how good they are in Java programming.  A team of engineers from Oracle Development center in Saint-Petersburg prepared the set of problems to solve during the competition. To win, participants needed to show deep knowledge of Java technologies from Classloader and NIO to Reflection and JavaDB. Students in each location had a PC with Oracle JDK 1.7u2 and Netbeans 7.1.  As a testing system, the organizers used the open source software Ejudge (with several tweaks specifically for the competition).  Participants submitted their solutions to the remote server where they were tested by prepared test harnesses. All results were posted in real-time. "I followed the competition coming in from the many sites, and it was a really exciting experience, like a horse race or football game!" exclaimed Java Evangelist Alexander Belokrylov. Congratulations to everyone who competed! The Olympic finals will on April 4th. 

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• What did you learn today?

  - by Rajesh Pillai

  What did you learn today? Everyday teaches you something, some lesson or the other. Some day you learn a new language, a new skill or a new hobby or visit some new place, learn music, have a different dining experience, learn swimming, make some good friends, get in touch with some old friend etc. etc…. Each of these things teaches you something… So, what did you learn today? Some of the learnings from my past weeks are outlined below… Respect others. Don’t underestimate them. (Though I never consciously do so) Be careful with your words because words have different meanings if the context is not clear. Spend some time for your personal stuff and allow others do so. Every individual is different, their skills different, their thoughts are different, their perceptions are different. So, be polite. Time management. (This is a tough skill to master). At the end of the day I keep looking for more time so may be you. So, again What did you learn today? This reflection is important because if you don’t know what you are learning at every stage in your life, then your are not learning and not growing. In short you are not living. Learning is not memorization but it is self realization….. Happy learning!!!

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• Employing elegance in order to evade importing elephants: a case of excessive dll Imports

  - by user994179

  I am writing C# code that interfaces to a legacy (Feb 2012) C program, using DllImport. It works fine, but I need to call more than 30 different functions, turning my normally impeccable, exquisite code into something of near-elephantine proportions. Surely there must be a way around this? [Warning: those with weak stomachs may want to avert their eyes from what follows]: [DllImport("C:\\Users\\mitt\\Documents\\Visual Studio 2010\\Projects\\mrSolution\\mr\\x64\\Debug\\mrDll.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)] public static extern bool mrEngine_initialize( [In, Out, MarshalAs(UnmanagedType.LPStruct)] PLOT_SPEC PlotSpec); [DllImport("C:\\Users\\mitt\\Documents\\Visual Studio 2010\\Projects\\mrSolution\\mr\\x64\\Debug\\mrDll.dll", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)] public static extern bool mrEngine_getDataPoint( [In, Out, MarshalAs(UnmanagedType.LPStruct)] PLOT_SPEC PlotSpec);

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• IF Statement has strange behavior

  - by BSchlinker

  I've developed a 'custom' cout, so that I can display text to console and also print it to a log file. This cout class is passed a different integer on initialization, with the integer representing the verbosity level of the message. If the current verbosity level is greater then or equal to the verbosity level of the message, the message should print. The problem is, I have messages printing even when the current verbosity level is too low. I went ahead and debugged it, expecting to find the problem. Instead, I found multiple scenarios where my if statements are not working as expected. The statement if(ilralevel_passed <= ilralevel_set) will sometimes proceed even if ilralevel_set is LESS then ilralevel_passed. You can see this behavior in the following picture (my apologizes for using Twitpic) http://twitpic.com/1xtx4g/full. Notice how ilralevel_set is equal to zero, and ilralevel_passed is equal to one. Yet, the if statement has returned true and is now moving forward to pass the line to cout. I've never seen this type of behavior before and I'm not exactly sure how to proceed debugging it. I'm not able to isolate the behavior either -- it only occurs in certain parts of my program. Any suggestions are appreciated as always. // Here is an example use of the function: // ilra_status << setfill('0') << setw(2) << dispatchtime.tm_sec << endl; // ilra_warning << "Dispatch time (seconds): " << mktime(&dispatchtime) << endl; // Here is the 'custom' cout function: #ifndef ILRA_H_ #define ILRA_H_ // System libraries #include <iostream> #include <ostream> #include <sstream> #include <iomanip> // Definitions #define ilra_talk ilra(__FUNCTION__,0) #define ilra_update ilra(__FUNCTION__,0) #define ilra_error ilra(__FUNCTION__,1) #define ilra_warning ilra(__FUNCTION__,2) #define ilra_status ilra(__FUNCTION__,3) // Statics static int ilralevel_set = 0; static int ilralevel_passed; // Classes class ilra { public: // constructor / destructor ilra(const std::string &funcName, int toset) { ilralevel_passed = toset; } ~ilra(){}; // enable / disable irla functions static void ilra_verbose_level(int toset){ ilralevel_set = toset; } // output template <class T> ilra &operator<<(const T &v) { if(ilralevel_passed <= ilralevel_set) std::cout << v; return *this; } ilra &operator<<(std::ostream&(*f)(std::ostream&)) { if(ilralevel_passed <= ilralevel_set) std::cout << *f; return *this; } }; // end of the class #endif /* ILRA_H_ */

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• How to get or own your own IP address?

  - by Cory

  The website we running let people register their own URL and redirect to our website to their user account. Lets it is something similar to Blogspot.com where users can have their own URL. The problem is that in order to do this we need to have static IP address for the DNS redirection to work. We can easily get static IP addresses from most hosting companies, but if we change our hosting company it means we will have to force all our users to change their DNS setting to our new IP address. This if very problematic. Is there a way of owning our own IP address that we can take it with us to wherever hosting company we decide to go with? Or there there other easier solutions out there?

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• ASP.NET MVC - Alternative to Role Provider?

  - by ebb

  Hey there, I'm trying to avoid the use of the Role Provider and Membership Provider since its way too clumsy in my opinion, and therefore I'm trying to making my own "version" which is less clumsy and more manageable/flexible. Now is my question.. is there an alternative to the Role Provider which is decent? (I know that I can do custom Role provier, membership provider etc.) By more manageable/flexible I mean that I'm limited to use the Roles static class and not implement directly into my service layer which interact with the database context, instead I'm bound to use the Roles static class which has its own database context etc, also the table names is awful.. Thanks in advance.

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• wglCreateContext in C# failing but not in managed C++

  - by SeeR

  I'm trying to use opengl in C#. I have following code which fails with error 2000 ERROR_INVALID_PIXEL_FORMAT First definitions: [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)] public static extern IntPtr GetDC(IntPtr hWnd); [StructLayout(LayoutKind.Sequential)] public struct PIXELFORMATDESCRIPTOR { public void Init() { nSize = (ushort) Marshal.SizeOf(typeof (PIXELFORMATDESCRIPTOR)); nVersion = 1; dwFlags = PFD_FLAGS.PFD_DRAW_TO_WINDOW | PFD_FLAGS.PFD_SUPPORT_OPENGL | PFD_FLAGS.PFD_DOUBLEBUFFER | PFD_FLAGS.PFD_SUPPORT_COMPOSITION; iPixelType = PFD_PIXEL_TYPE.PFD_TYPE_RGBA; cColorBits = 24; cRedBits = cRedShift = cGreenBits = cGreenShift = cBlueBits = cBlueShift = 0; cAlphaBits = cAlphaShift = 0; cAccumBits = cAccumRedBits = cAccumGreenBits = cAccumBlueBits = cAccumAlphaBits = 0; cDepthBits = 32; cStencilBits = cAuxBuffers = 0; iLayerType = PFD_LAYER_TYPES.PFD_MAIN_PLANE; bReserved = 0; dwLayerMask = dwVisibleMask = dwDamageMask = 0; } ushort nSize; ushort nVersion; PFD_FLAGS dwFlags; PFD_PIXEL_TYPE iPixelType; byte cColorBits; byte cRedBits; byte cRedShift; byte cGreenBits; byte cGreenShift; byte cBlueBits; byte cBlueShift; byte cAlphaBits; byte cAlphaShift; byte cAccumBits; byte cAccumRedBits; byte cAccumGreenBits; byte cAccumBlueBits; byte cAccumAlphaBits; byte cDepthBits; byte cStencilBits; byte cAuxBuffers; PFD_LAYER_TYPES iLayerType; byte bReserved; uint dwLayerMask; uint dwVisibleMask; uint dwDamageMask; } [Flags] public enum PFD_FLAGS : uint { PFD_DOUBLEBUFFER = 0x00000001, PFD_STEREO = 0x00000002, PFD_DRAW_TO_WINDOW = 0x00000004, PFD_DRAW_TO_BITMAP = 0x00000008, PFD_SUPPORT_GDI = 0x00000010, PFD_SUPPORT_OPENGL = 0x00000020, PFD_GENERIC_FORMAT = 0x00000040, PFD_NEED_PALETTE = 0x00000080, PFD_NEED_SYSTEM_PALETTE = 0x00000100, PFD_SWAP_EXCHANGE = 0x00000200, PFD_SWAP_COPY = 0x00000400, PFD_SWAP_LAYER_BUFFERS = 0x00000800, PFD_GENERIC_ACCELERATED = 0x00001000, PFD_SUPPORT_DIRECTDRAW = 0x00002000, PFD_DIRECT3D_ACCELERATED = 0x00004000, PFD_SUPPORT_COMPOSITION = 0x00008000, PFD_DEPTH_DONTCARE = 0x20000000, PFD_DOUBLEBUFFER_DONTCARE = 0x40000000, PFD_STEREO_DONTCARE = 0x80000000 } public enum PFD_LAYER_TYPES : byte { PFD_MAIN_PLANE = 0, PFD_OVERLAY_PLANE = 1, PFD_UNDERLAY_PLANE = 255 } public enum PFD_PIXEL_TYPE : byte { PFD_TYPE_RGBA = 0, PFD_TYPE_COLORINDEX = 1 } [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)] public static extern int ChoosePixelFormat(IntPtr hdc, [In] ref PIXELFORMATDESCRIPTOR ppfd); [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)] public static extern bool SetPixelFormat(IntPtr hdc, int iPixelFormat, ref PIXELFORMATDESCRIPTOR ppfd); [DllImport("opengl32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)] public static extern IntPtr wglCreateContext(IntPtr hDC); And now the code that fails: IntPtr dc = Win.GetDC(hwnd); var pixelformatdescriptor = new GL.PIXELFORMATDESCRIPTOR(); pixelformatdescriptor.Init(); var pixelFormat = GL.ChoosePixelFormat(dc, ref pixelformatdescriptor); if(!GL.SetPixelFormat(dc, pixelFormat, ref pixelformatdescriptor)) throw new Win32Exception(Marshal.GetLastWin32Error()); IntPtr hglrc; if((hglrc = GL.wglCreateContext(dc)) == IntPtr.Zero) throw new Win32Exception(Marshal.GetLastWin32Error()); //<----- here I have exception the same code in managed C++ is working HDC dc = GetDC(hWnd); PIXELFORMATDESCRIPTOR pf; pf.nSize = sizeof(PIXELFORMATDESCRIPTOR); pf.nVersion = 1; pf.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER | PFD_SUPPORT_COMPOSITION; pf.cColorBits = 24; pf.cRedBits = pf.cRedShift = pf.cGreenBits = pf.cGreenShift = pf.cBlueBits = pf.cBlueShift = 0; pf.cAlphaBits = pf.cAlphaShift = 0; pf.cAccumBits = pf.cAccumRedBits = pf.cAccumGreenBits = pf.cAccumBlueBits = pf.cAccumAlphaBits = 0; pf.cDepthBits = 32; pf.cStencilBits = pf.cAuxBuffers = 0; pf.iLayerType = PFD_MAIN_PLANE; pf.bReserved = 0; pf.dwLayerMask = pf.dwVisibleMask = pf.dwDamageMask = 0; int ipf = ChoosePixelFormat(dc, &pf); SetPixelFormat(dc, ipf, &pf); HGLRC hglrc = wglCreateContext(dc); I've tried it on VIsta 64-bit with ATI graphic card and on Windows XP 32-bit with Nvidia with the same result in both cases. Also I want to mention that I don't want to use any already written framework for it. Can anyone show me where is the bug in C# code that is causing the exception?

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• java checked exception in a catch clause compilation error

  - by srandpersonia

  Hi, I was expecting an compilation error in the following program because of the throw statement in the catch block as IOException is a checked exception and it is not caught by another try block within the catch block. But I am getting "Hurray!" printed. Any explanation would be much appreciated. According to JLS 11.2.3, http://java.sun.com/docs/books/jls/third_edition/html/exceptions.html It is a compile-time error if a method or constructor body can throw some exception type E when both of the following hold: * E is a checked exception type * E is not a subtype of some type declared in the throws clause of the method or constructor. import java.io.*; public class Test{ public static void main(String args[]) { System.out.println(method()); } public static int method() { try{ throw new Exception(); } catch(Exception e){ throw new IOException(); //No compile time error } finally{ System.out.println("Hurray!"); } } } Thanks in advance.

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• How can I have a serializable struct that wraps it's self as an int32 implicitly? in C#?

  - by firoso

  Long story short, I have a struct (see below) that contains exactly one field: private int value; I've also implemented implicit conversion operators: public static implicit operator int(Outlet val) { return val.value; } public static implicit operator Outlet(int val) { return new Outlet(val); } I've implemented all of the following : IComparable, IComparable<Cart>, IComparable<int>, IConvertible, IEquatable<Cart>, IEquatable<int>, IFormattable I'm at a point where I really have no clue why, but whenever I serialize this object, I get no value. For instance, with XmlSerialization: <Outlet /> Also, I'm not solely concerned about XmlSerialization, I'm concerned about ALL serialization (binary for instance) How can I ensure that this serializes properly? NOTE: I did this because mapping an int,int dictionary seemed rather poorly typed to me when explicit objects with validation behavior were desired.

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• Grails / GORM, Disable First-level Cache

  - by Stephen Swensen

  Suppose I have the following Domain class mapping to a legacy table, utilizing read-only second-level cache, and having a transient field: class DomainObject { static def transients = ['userId'] Long id Long userId static mapping = { cache usage: 'read-only' table 'SOME_TABLE' } } I have a problem, references to DomainObject are being shared due to first-level caching, and thus transient fields are writing over each other. For example, def r1 = DomainObject.get(1) r1.userId = 22 def r2 = DomainObject.get(1) r2.userId = 34 assert r1.userId == 34 That is, r1 and r2 are references to the same instance. This is undesirable, I would like to cache the table data without sharing references. Any ideas? [Edit] Understanding the situation better now, I believe my question boils down to the following: Is there anyway to disable first level cache for a specific domain class while still using second level cache?

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• WPF ListView in GridView mode Highlighting problem

  - by xenik

  While reskining GridView (ListView with more columns), I ran into a problem, that I couldn't change the color of the Highlighted row. I searched the internet and found out, that adding this can help. <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent" /> <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" /> This solved the issue for some people but it didnt help me. The Highlight color was still in system default. I finally managed to change the color of the selected row, but the highlight is still visible around the border of the row plus i need to get rid of the Highlight in the ColumnHeaders. Heres the code, where my approach doesn't work. sth sthelse

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• I can't Open my excel file in c#

  - by Ruben Guico

  Hi, Below is my code, i tried to open my excel file in my c# application but the program give's me an error message "Cannot Access "my excel.xls". But when I specify the file path in my string path variable it works, the problem is I need to get the file path from an openFileDialog. using System; using System.IO; using System.Collections.Generic; using System.Text; using System.Data; using System.Windows.Forms; using System.Data.OleDb; using System.Reflection; using MOIE = Microsoft.Office.Interop.Excel; using OFFICE = Microsoft.Office.Core; namespace EmpUploader { public class ExcelCon { private OleDbDataReader reader = null; private OleDbCommand excelCommand = new OleDbCommand(); private OleDbDataAdapter adapter = new OleDbDataAdapter(); private DataTable excelData = new DataTable(); private MOIE.ApplicationClass objExcel = new MOIE.ApplicationClass(); private MOIE.Workbook wb = null; private string myConn = ""; private string strSQL = ""; private string err = ""; private string path2 = ""; private int sheetCount = 0; private OleDbConnection Con = new OleDbConnection(""); #region "excel interop prarameters" private static object xl_missing = Type.Missing; private static object xl_true = true; private static object xl_false = false; private object xl_update_links = xl_missing; private object xl_read_only = xl_missing; private object xl_format = xl_missing; private object xl_password = xl_missing; private object xl_write_res_password = xl_missing; private object xl_ignore_read_only = xl_missing; private object xl_origin = xl_missing; private object xl_delimiter = xl_missing; private object xl_editable = xl_missing; private object xl_notify = xl_missing; private object xl_converter = xl_missing; private object xl_add_to_mru = xl_missing; private object xl_local = xl_missing; private object xl_corrupt_load = xl_missing; #endregion } //MY CODE FOR OPENING THE EXCEL //note that my file path came from an openfiledialog public void InitializeConnection(string path) { //connection string for excel myConn = @"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + path + "; Extended Properties =Excel 8.0"; Con.ConnectionString = myConn; Con.Open(); //this is the sample specified path that worked when i test my application //path = @"C:\shinetsu p5 emp list.xls"; objExcel.Visible = false; wb = objExcel.Workbooks.Open(path, xl_update_links, xl_read_only, xl_format, xl_password, xl_write_res_password, xl_ignore_read_only, xl_origin, xl_delimiter, xl_editable, xl_notify, xl_converter, xl_add_to_mru, xl_local, xl_corrupt_load); sheetCount = wb.Worksheets.Count; } }

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• How to encrypt and save a binary stream after serialization and read it back?

  - by Anindya Chatterjee

  I am having some problems in using CryptoStream when I want to encrypt a binary stream after binary serialization and save it to a file. I am getting the following exception System.ArgumentException : Stream was not readable. Can anybody please show me how to encrypt a binary stream and save it to a file and deserialize it back correctly? The code is as follows: class Program { public static void Main(string[] args) { var b = new B {Name = "BB"}; WriteFile<B>(@"C:\test.bin", b, true); var bb = ReadFile<B>(@"C:\test.bin", true); Console.WriteLine(b.Name == bb.Name); Console.ReadLine(); } public static T ReadFile<T>(string file, bool decrypt) { T bObj = default(T); var _binaryFormatter = new BinaryFormatter(); Stream buffer = null; using (var stream = new FileStream(file, FileMode.OpenOrCreate)) { if(decrypt) { const string strEncrypt = "*#4$%^.++q~!cfr0(_!#$@$!&#&#*&@(7cy9rn8r265&$@&*E^184t44tq2cr9o3r6329"; byte[] dv = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; CryptoStream cs; DESCryptoServiceProvider des = null; var byKey = Encoding.UTF8.GetBytes(strEncrypt.Substring(0, 8)); using (des = new DESCryptoServiceProvider()) { cs = new CryptoStream(stream, des.CreateEncryptor(byKey, dv), CryptoStreamMode.Read); } buffer = cs; } else buffer = stream; try { bObj = (T) _binaryFormatter.Deserialize(buffer); } catch(SerializationException ex) { Console.WriteLine(ex.Message); } } return bObj; } public static void WriteFile<T>(string file, T bObj, bool encrypt) { var _binaryFormatter = new BinaryFormatter(); Stream buffer; using (var stream = new FileStream(file, FileMode.Create)) { try { if(encrypt) { const string strEncrypt = "*#4$%^.++q~!cfr0(_!#$@$!&#&#*&@(7cy9rn8r265&$@&*E^184t44tq2cr9o3r6329"; byte[] dv = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; CryptoStream cs; DESCryptoServiceProvider des = null; var byKey = Encoding.UTF8.GetBytes(strEncrypt.Substring(0, 8)); using (des = new DESCryptoServiceProvider()) { cs = new CryptoStream(stream, des.CreateEncryptor(byKey, dv), CryptoStreamMode.Write); buffer = cs; } } else buffer = stream; _binaryFormatter.Serialize(buffer, bObj); buffer.Flush(); } catch(SerializationException ex) { Console.WriteLine(ex.Message); } } } } [Serializable] public class B { public string Name {get; set;} } It throws the serialization exception as follows The input stream is not a valid binary format. The starting contents (in bytes) are: 3F-17-2E-20-80-56-A3-2A-46-63-22-C4-49-56-22-B4-DA ...

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• Clean Code Development & Flexible work environment - MSCC 26.10.2013

  Finally, some spare time to summarize my impressions and experiences of the recent meetup of Mauritius Software Craftsmanship Community. I already posted my comment on the event and on our social media networks: Professional - It's getting better with our meetups and I really appreciated that 'seniors' and 'juniors' were present today. Despite running a little bit out of time it was really great to see more students coming to the gathering. This time we changed location for our Saturday meetup and it worked out very well. A big thank you to Ebene Accelerator, namely Mrs Poonum, for the ability to use their meeting rooms for our community get-together. Already some weeks ago I had a very pleasant conversation with her about the MSCC aims, 'mission' and how we organise things. Additionally, I think that an environment like the Ebene Accelerator is a good choice as it acts as an incubator for young developers and start-ups. Reactions from other craftsmen Before I put my thoughts about our recent meeting down, I'd like to mention and cross-link to some of the other craftsmen that were present: "MSCC meet up is a massive knowledge gaining strategies for students, future entrepreneurs, or for geeks all around. Knowledge sharing becomes a fun. For those who have not been able to made it do subscribe on our MSCC meet up group at meetup.com." -- Nitin on Learning is fun with #MSCC #Ebene Accelerator "We then talked about the IT industry in Mauritius, salary issues in various field like system administration, software development etc. We analysed the reasons why people tend to hop from one company to another. That was a fun debate." -- Ish on MSCC meetup - Gang of Geeks "Flexible Learning Environment was quite interesting since these lines struck cords : "You're not a secretary....9 to 5 shouldn't suit you"....This allowed reflection...deep reflection....especially regarding the local mindset...which should be changed in a way which would promote creativity rather than choking it till death..." -- Yannick on 2nd MSCC Monthly Meet-up And others on Facebook... ;-) Visual impressions are available on our Meetup event page. More first time attendees We great pleasure I noticed that we have once again more first time visitors. A quick overlook showed that we had a majority of UoM students in first, second or last year. Some of them are already participating in the UoM Computer Club or are nominated as members of the Microsoft Student Partner (MSP) programme. Personally, I really appreciate the fact that the MSCC is able to gather such a broad audience. And as I wrote initially, the MSCC is technology-agnostic; we want IT people from any segment of this business. Of course, students which are about to delve into the 'real world' of working are highly welcome, and I hope that they might get one or other glimpse of experience or advice from employees. Sticking to the schedule? No, not really... And honestly, it was a good choice to go a little bit of the beaten tracks. I mean, yes we have a 'rough' agenda of topics that we would like to talk about or having a presentation about. But we keep it 'agile'. Due to the high number of new faces, we initiated another quick round of introductions and I gave a really brief overview of the MSCC. Next, we started to reflect on the Clean Code Developer (CCD) - Red Grade which we introduced on the last meetup. Nirvan was the lucky one and he did a good job on summarizing the various abbreviations of the first level of being a CCD. Actually, more interesting, we exchanged experience about the principles and practices of Red Grade, and it was very informative to get to know that Yann actually 'interviewed' a couple of friends, other students, local guys working in IT companies as well as some IT friends from India in order to counter-check on what he learned first-hand about Clean Code. Currently, he is reading the book of Robert C. Martin on that topic and I'm looking forward to his review soon. More output generates more input What seems to be like a personal mantra is working out pretty well for me since the beginning of this year. Being more active on social media networks, writing more article on my blog, starting the Mauritius Software Craftsmanship Community, and contributing more to other online communities has helped me to receive more project requests, job offers and possibilities to expand my business at IOS Indian Ocean Software Ltd. Actually, it is not a coincidence that one of the questions new craftsmen should answer during registration asks about having a personal blog. Whether you are just curious about IT, right in the middle of your Computer Studies, or already working in software development or system administration since a while you should consider to advertise and market yourself online. Easiest way to resolve this are to have online profiles on professional social media networks like LinkedIn, Xing, Twitter, and Google+ (no Facebook should be considered for private only), and considering to have a personal blog. Why? -- Be yourself, be proud of your work, and let other people know that you're passionate about your profession. Trust me, this is going to open up opportunities you might not have dreamt about... Exchanging ideas about having a professional online presence - MSCC meetup on the 26th October 2013 Furthermore, consider to put your Curriculum Vitae online, too. There are quite a number of service providers like 1ClickCV, Stack Overflow Careers 2.0, etc. which give you the ability to have an up to date CV online. At least put it on your site, next to your personal blog. Similar to what you would be able to see on my site here. Cyber Island Mauritius - are we there? A couple of weeks ago I got a 'cold' message on LinkedIn from someone living in the U.S. asking about the circumstances and conditions of the IT world of Mauritius. He has a great business idea, venture capital and is currently looking for a team of software developers (mainly mobile - iOS) for a new startup here in Mauritius. Since then we exchanged quite some details through private messages and Skype conversations, and I suggested that it might be a good chance to join our meetup through a conference call and see for yourself about potential candidates. During approximately 30 to 40 minutes the brief idea of the new startup was presented - very promising state-of-the-art technology aspects and integration of various public APIs -, and we had a good Q&A session about it. Also thanks to the excellent bandwidth provided by the Ebene Accelerator the video conference between three parties went absolutely well. Clean Code Developer - Orange Grade Hahaha - nice one... Being at the Orange Tower at Ebene and then talking about an Orange Grade as CCD. Well, once again I provided an overview of the principles and practices in that rank of Clean Code, and similar to our last meetup we discussed on the various aspect of each principle, whether someone already got in touch with it during studies or work, and how it could affect their future view on their source code. Following are the principles and practices of Clean Code Developer - Orange Grade: CCD Orange Grade - Principles Single Level of Abstraction (SLA) Single Responsibility Principle (SRP) Separation of Concerns (SoC) Source Code conventions CCD Orange Grade - Practices Issue Tracking Automated Integration Tests Reading, Reading, Reading Reviews Especially the part on reading technical books got some extra attention. We quickly gathered our views on that and came up with a result that ranges between Zero (0) and up to Fifteen (15) book titles per year. Personally, I'm keeping my progress between Six (6) and Eight (8) titles per year, but at least One (1) per quarter of a year. Which is also connected to the fact that I'm participating in the O'Reilly Reader Review Program and have a another benefit to get access to free books only by writing and publishing a review afterwards. We also had a good exchange on the extended topic of 'Reviews' - which to my opinion is abnormal difficult here in Mauritius for various reasons. As far as I can tell from my experience working with Mauritian software developers, either as colleagues, employees or during consulting services there are unfortunately two dominant pattern on that topic: Keeping quiet Running away Honestly, I have no evidence about why these are the two 'solutions' on reviews but that's the situation that I had to face over the last couple of years. Sitting together and talking about problematic issues, tackling down root causes of de-motivational activities and working on general improvements doesn't seem to have a ground within the IT world of Mauritius. Are you a typist or a creative software craftsman? - MSCC meetup on the 26th October 2013 One very good example that we talked about was the fact of 'job hoppers' as you can easily observe it on someone's CV - those people change job every single year; for no obvious reason! Frankly speaking, I wouldn't even consider an IT person like to for an interview. As a company you're investing money and effort into the abilities of your employees. Hiring someone that won't stay for a longer period is out of question. And sorry to say, these kind of IT guys smell fishy about their capabilities and more likely to cause problems than actually produce productive results. One of the reasons why there is a probation period on an employment contract is to give you the liberty to leave as early as possible in case that you don't like your new position. Don't fool yourself or waste other people's time and money by hanging around a full year only to snatch off the bonus payment... Future outlook: Developer's Conference Even though it is not official yet I already mentioned it several times during our weekly Code & Coffee sessions. The MSCC is looking forward to be able to organise or to contribute to an upcoming IT event. Currently, the rough schedule is set for April 2014 but this mainly depends on availability of location(s), a decent time frame for preparations, and the underlying procedures with public bodies to have it approved and so on. As soon as the information about date and location has been fixed there will be a 'Call for Papers' period in order to attract local IT enthusiasts to apply for a session slot and talk about their field of work and their passion in IT. More to come for sure... My resume of the day It was a great gathering and I am very pleased about the fact that we had another 15 craftsmen (plus 2 businessmen on conference call plus 2 young apprentices) in the same room, talking about IT related topics and sharing their experience as employees and students. Personally, I really appreciated the feedback from the students about their current view on their future career, and I really hope that some of them are going to pursue their dreams. Start promoting yourself and it will happen... Looking forward to your blogs! And last but not least our numbers on Meetup and Facebook have been increased as a direct consequence of this meetup. Please, spread the word about the MSCC and get your friends and colleagues to join our official site. The higher the number of craftsmen we have the better chances we have t achieve something great! Thanks!

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• Is there a simpler way to convert a byte array to a 2-byte-size hexadecimal string?

  - by Tom Brito

  Is there a simpler way of implement this? Or a implemented method in JDK or other lib? /** * Convert a byte array to 2-byte-size hexadecimal String. */ public static String to2DigitsHex(byte[] bytes) { String hexData = ""; for (int i = 0; i < bytes.length; i++) { int intV = bytes[i] & 0xFF; // positive int String hexV = Integer.toHexString(intV); if (hexV.length() < 2) { hexV = "0" + hexV; } hexData += hexV; } return hexData; } public static void main(String[] args) { System.out.println(to2DigitsHex(new byte[] {8, 10, 12})); } the output is: "08 0A 0C" (without the spaces)

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• Apress "Pro DLR in .NET 4' - ISBN 978-1-430203066-3 - Initial comments

  - by TATWORTH

  The dynamic language runtime (DLR) is a radical development of Dot Net. In some ways it is like the Laser was 40 years, a solution looking for a problem. At the moment the DLR supports languages such as Iron Ruby and Iron Python, together with dynamic extensions for C# and VB.NET. Where DLR will also score is the ability to write your own Dot Net language for specialist areas. So how does this book fare in introducing the DLR? It is a book that will require careful study and perhaps reading several times before fully understanding the subject. You will need to spend time trying out the sample code. So who would I recommend this book to? I recommend it to C# development teams for their library. I recommend it to individuals who not only know C# but have a good history of learning other computer languages. It is not a book that can just be "dipped into", but will require one or more reads from start to finish. This is no reflection on the skill of the author but of the newness of the material.

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• Managing EntityConnection lifetime

  - by kervin

  There have been many question on managing EntityContext lifetime, e.g. http://stackoverflow.com/questions/813457/instantiating-a-context-in-linq-to-entities I've come to the conclusion that the entity context should be considered a unit-of-work and therefore not reused. Great. But while doing some research for speeding up my database access, I ran into this blog post... Improving Entity Framework Performance The post argues that EFs poor performance compared to other frameworks is often due to the EntityConnection object being created each time a new EntityContext object is needed. To test this I manually created a static EntityConnection in Global.asax.cs Application_Start(). I then converted all my context using statements to using( MyObjContext currContext = new MyObjeContext(globalStaticEFConnection) { .... } This seems to have sped things up a bit without any errors so far as far as I can tell. But is this safe? Does using a applicationwide static EntityConnection introduce race conditions? Best regards, Kervin

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