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• How to layout class definition when inheriting from multiple interfaces

  - by gabr

  Given two interface definitions ... IOmniWorkItem = interface ['{3CE2762F-B7A3-4490-BF22-2109C042EAD1}'] function GetData: TOmniValue; function GetResult: TOmniValue; function GetUniqueID: int64; procedure SetResult(const value: TOmniValue); // procedure Cancel; function DetachException: Exception; function FatalException: Exception; function IsCanceled: boolean; function IsExceptional: boolean; property Data: TOmniValue read GetData; property Result: TOmniValue read GetResult write SetResult; property UniqueID: int64 read GetUniqueID; end; IOmniWorkItemEx = interface ['{3B48D012-CF1C-4B47-A4A0-3072A9067A3E}'] function GetOnWorkItemDone: TOmniWorkItemDoneDelegate; function GetOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; procedure SetOnWorkItemDone(const Value: TOmniWorkItemDoneDelegate); procedure SetOnWorkItemDone_Asy(const Value: TOmniWorkItemDoneDelegate); // property OnWorkItemDone: TOmniWorkItemDoneDelegate read GetOnWorkItemDone write SetOnWorkItemDone; property OnWorkItemDone_Asy: TOmniWorkItemDoneDelegate read GetOnWorkItemDone_Asy write SetOnWorkItemDone_Asy; end; ... what are your ideas of laying out class declaration that inherits from both of them? My current idea (but I don't know if I'm happy with it): TOmniWorkItem = class(TInterfacedObject, IOmniWorkItem, IOmniWorkItemEx) strict private FData : TOmniValue; FOnWorkItemDone : TOmniWorkItemDoneDelegate; FOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; FResult : TOmniValue; FUniqueID : int64; strict protected procedure FreeException; protected //IOmniWorkItem function GetData: TOmniValue; function GetResult: TOmniValue; function GetUniqueID: int64; procedure SetResult(const value: TOmniValue); protected //IOmniWorkItemEx function GetOnWorkItemDone: TOmniWorkItemDoneDelegate; function GetOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; procedure SetOnWorkItemDone(const Value: TOmniWorkItemDoneDelegate); procedure SetOnWorkItemDone_Asy(const Value: TOmniWorkItemDoneDelegate); public constructor Create(const data: TOmniValue; uniqueID: int64); destructor Destroy; override; public //IOmniWorkItem procedure Cancel; function DetachException: Exception; function FatalException: Exception; function IsCanceled: boolean; function IsExceptional: boolean; property Data: TOmniValue read GetData; property Result: TOmniValue read GetResult write SetResult; property UniqueID: int64 read GetUniqueID; public //IOmniWorkItemEx property OnWorkItemDone: TOmniWorkItemDoneDelegate read GetOnWorkItemDone write SetOnWorkItemDone; property OnWorkItemDone_Asy: TOmniWorkItemDoneDelegate read GetOnWorkItemDone_Asy write SetOnWorkItemDone_Asy; end; As noted in answers, composition is a good approach for this example but I'm not sure it applies in all cases. Sometimes I'm using multiple inheritance just to split read and write access to some property into public (typically read-only) and private (typically write-only) part. Does composition still apply here? I'm not really sure as I would have to move the property in question out from the main class and I'm not sure that's the correct way to do it. Example: // public part of the interface interface IOmniWorkItemConfig = interface function OnExecute(const aTask: TOmniBackgroundWorkerDelegate): IOmniWorkItemConfig; function OnRequestDone(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; function OnRequestDone_Asy(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; end; // private part of the interface IOmniWorkItemConfigEx = interface ['{42CEC5CB-404F-4868-AE81-6A13AD7E3C6B}'] function GetOnExecute: TOmniBackgroundWorkerDelegate; function GetOnRequestDone: TOmniWorkItemDoneDelegate; function GetOnRequestDone_Asy: TOmniWorkItemDoneDelegate; end; // implementing class TOmniWorkItemConfig = class(TInterfacedObject, IOmniWorkItemConfig, IOmniWorkItemConfigEx) strict private FOnExecute : TOmniBackgroundWorkerDelegate; FOnRequestDone : TOmniWorkItemDoneDelegate; FOnRequestDone_Asy: TOmniWorkItemDoneDelegate; public constructor Create(defaults: IOmniWorkItemConfig = nil); public //IOmniWorkItemConfig function OnExecute(const aTask: TOmniBackgroundWorkerDelegate): IOmniWorkItemConfig; function OnRequestDone(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; function OnRequestDone_Asy(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; public //IOmniWorkItemConfigEx function GetOnExecute: TOmniBackgroundWorkerDelegate; function GetOnRequestDone: TOmniWorkItemDoneDelegate; function GetOnRequestDone_Asy: TOmniWorkItemDoneDelegate; end;

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• How customers view and interact with a company

  The Harvard Business Review article written by Rayport and Jaworski is aptly titled “Best Face Forward” because it sheds light on how customers view and interact with a company. In the past most business interaction between customers was performed in a face to face meeting where one party would present an item for sale and then the other would decide whether to purchase the item. In addition, if there was a problem with a purchased item then they would bring the item back to the person who sold the item for resolution. One of my earliest examples of witnessing this was when I was around 6 or 7 years old and I was allowed to spend the summer in Tennessee with my Grandparents. My Grandfather had just written a book about the local history of his town and was selling them to his friends and local bookstores. I still remember he offered to pay me a small commission for every book I helped him sell because I was carrying the books around for him. Every sale he made was face to face with his customers which allowed him to share his excitement for the book with everyone. In today’s modern world there is less and less human interaction as the use of computers and other technologies allow us to communicate within seconds even though both parties may be across the globe or just next door. That being said, customers view a company through multiple access points called faces that represent the ability to interact without actually seeing a human face. As a software engineer this is a good and a bad thing because direct human interaction and technology based interaction have both good and bad attributes based on the customer. How organizations coordinate business and IT functions, to provide quality service varies based on each individual business and the goals and directives put in place by its management. According to Rayport and Jaworski, the type of interaction used through a particular access point may lend itself to be people-dominate, machine-dominate, or a combination of both. The method by which a company communicates information through an access point is a strategic choice that relates costs and customer outcomes. To simplify this, the choice is based on what can give the customer the best experience interacting with the company when the cost of the interaction is also a factor. I personally see examples of this every day at work. The company website is machine-dominate with people updating and maintaining information, our groups department is people dominate because most of the customer interaction is done at the customers location and is backed up by machine based data sources, and our sales/member service department is a hybrid because employees work in tandem with machines in order for them to assist customers with signing up or any other issue they may have. The positive and negative aspects of human and machine interfaces are a key aspect in deciding which interface to use when allowing customers to access a company or a combination of the two. Rayport and Jaworski also used MIT professor Erik Brynjolfsson preliminary catalog of human and machine strengths. He stated that humans outperform machines in judgment, pattern recognition, exception processing, insight, and creativity. I have found this to be true based on the example of how sales and member service reps at my company handle a multitude of questions and various situations with a lot of unknown variables. A machine interface could never effectively be able to handle these scenarios because there are too many variables to consider and would not have the built-in logic to process each customer’s claims and needs. In addition, he also stated that machines outperform humans in collecting, storing, transmitting and routine processing. An example of this would be my employer’s website. Customers can simply go online and purchase a product without even talking to a sales or member services representative. The information is then stored in a database so that the customer can always go back and review there order, and access their selected services. A human, no matter how smart they are would never be able to keep track of hundreds of thousands of customers let alone know what they purchased or how much they paid. In today’s technology driven economy every company must offer their customers multiple methods of accessibly in order to survive. The more of an opportunity a company has to create a positive experience for their customers, in my opinion, they more likely the customer will return to that company again. I have noticed this with my personal shopping habits and experiences. References Rayport, J., & Jaworski, B. (2004). Best Face Forward. Harvard Business Review, 82(12), 47-58. Retrieved from Business Source Complete database.

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• Passing class names or objects?

  - by nischayn22

  I have a switch statement switch ( $id ) { case 'abc': return 'Animal'; case 'xyz': return 'Human'; //many more } I am returning class names,and use them to call some of their static functions using call_user_func(). Instead I can also create a object of that class, return that and then call the static function from that object as $object::method($param) switch ( $id ) { case 'abc': return new Animal; case 'xyz': return new Human; //many more } Which way is efficient? To make this question broader : I have classes that have mostly all static methods right now, putting them into classes is kind of a grouping idea here (for example the DB table structure of Animal is given by class Animal and so for Human class). I need to access many functions from these classes so the switch needs to give me access to the class

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• Let other computer view my localhost over a network...

  - by Smickie

  Hi, I have apache and what not running on my local machine (mac), there also another mac on the local network. How does this other machine access my localhost? For example I have a local website at example.local.net in my vhost. How can another computer on the network navigate to this site? Cheers!

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• What happens when the computer restarts to a Google gears worker?

  - by JavaRocky

  Regarding the worker pool. What happens when the computer restarts? Does the worker continue where it left off?

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• How do I solve subset-sum in polynomial time on a deterministic computer?

  - by stackoverflowuser2010

  I need to solve the subset-sum problem in polynomial time on a deterministic computer. How do I do that, and should I program in C, C++, Java, or C#?

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• Implementing a SMTP server on a personal computer (windows).

  - by DomingoSL

  I need a very simple SMTP server running on my computer for notification software that I developed. I tried "Free SMTP SERVER" and "QK SMTP SERVER 3", but for some reason they don't work, they always give me a time out error. Do you know some good SMTP server software? Thanks.

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• How to test to see if a computer has Excel installed (any version)?

  - by JPJedi

  I have a windows form application that when it starts needs to see if the user has Excel installed on the computer and if not display a message informing user that part of functionality will be disabled. Is their an easy way to perform this check? Working in Visual Studio 2008 with VB.Net

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• What is fastest way for a .Net program to index all images on a user's computer?

  - by Ole Jak

  What is fastest way for .Net programm to index all images on users computer? fastest - same pc configuration, diferent time (seconds) .Net programm - beter C# to index - get a list of absolute links (like c://bla-bla/file ) and save tham into file (index.txt) all images (like JPEGs, PNGs, BMPs)

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• What's the right way to communicate between 2 or more .Net applications running on a same computer w

  - by Ivan

  If my applications run on a same computer or even on different computers in a same LAN and need intense and quick communication, it seems illogical for me to use text-encoded web services and HTTP. I could possibly use IP/TCP/UDP sockets and invent my own protocols, but believe there is a standard way for .Net applications to send/receive object instances (and, maybe, even sharing an object by reference?). Can you tell me what's that standard way? I am only interested in .Net Framework 4 applications and don't need to support legacy frameworks.

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• Can we write a script to do something when a dialup connection is made to my computer?

  - by Elias Haileselassie

  This is the situation, I have configured a dial up server and i want to play a sound or pop up message when a daipup connection is made to my computer from a specific location? and I thing it can be done with configuration file or some script or to run some exe when a dail up connection is made to my server.please give me some ideas

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• How do I logout from a computer using shell ?

  - by baltusaj

  How can I log out of my computer using shell such the log-in window appears again? I need this functionality in one my Linux script.

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• Java: how can I react to computer shutdown in windows xp?

  - by Stas

  Hi! Is it possible make some handler that will do something when user shutdown computer with Java on Windows XP (optional, win7)? How? Thanks.

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• Does computer graphics have a practic use besides games/movies/pictures ?

  - by HJ-INCPP

  Hello, I am learning Computer Graphics at the university and I'm trying to figure out the use of it ... and I fail. Only games and movies stick in to my mind, I'm sure there are other uses for, let's say, graphic algorithms, openGL, 2D and 3D, 3ds Max ... Is it useful later on ? Where do I need it ? Thank you

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• Best way to solve programming problem without a computer?

  - by Kevin

  What is the best way to solve programming questions when you are givien a question to write a program, in an exam for example where you have no computer to test it. Is there a certain technique that people use to help them solve these type of written problems? Or is it all down to knowlegde of the language?

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• If I want to use a specific font that I know it is not available in most of the user's computer

  - by mayur

  Hi All, If I want to use a specific font that I know it is not available in most of the user's computer, is it possoble to embed the font in my web site in some way? I have gone to some web site using special fonts as text, but not as image. I wonder how it works. Thanks Mayur

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• How to Fix a Slow Computer in Simple Steps... [closed]

  - by jayseo

  Hello All I found one article about fixing PC in simple steps. http://top4registrycleanerreviews.com/how-to-fix-a-slow-computer-in-simple-steps.html Is all these steps are enough or not?

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• how to get network connection list in my computer with .NET?

  - by jozi

  how to get network connection list in my computer with c# vpn list or other in windows 7 this path Control Panel\Network and Internet\Network Connections i need for write a function to connect to internet in c#

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• every language eventually compiled into low-level computer language?

  - by fayer

  isn't every language compiled into low-level computer language? if so, shouldn't all languages have the same performance? just wondering...

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• How Adobe AIR program can to index all images on a user's computer?

  - by Ole Jak

  What is the fastest way for a Adobe AIR program program to index all images on a users' computer? Using Open Source ActionScript-3, MXML Libs and classes. Fastest - Same pc configuration, different time (seconds) To index - get a list of absolute links (like c://bla-bla/file ) and save them into file (index.txt) All images (like JPEGs, PNGs)

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• python: how/where to put a simple libary installed in a well-known-place on my computer

  - by Jason S

  I need to put a python script somewhere on my computer so that in another file I can use it. How do I do this and where do I put it? And where in the python documentation do I learn how to do this? I'm a beginner + don't use python much. library file: MyLib.py put in a well-known place def myfunc(): .... other file SourceFile.py located elsewhere, doesn't need to know where MyLib.py is: something = MyLib.myfunc()

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• how to show a messege box for restart computer after installation in c#?

  - by Ashwin

  hi i want to know about how to display a messege box to display a messege "Pleace restart your computer" with yes and no option is user click on yes then system restart. This messege box want to show after complition of installation. if is there any idiea about that then please help and i also want to knw if is there any code for that then where i place this code in installer class of elsewhere?

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• How to limit use to only one computer per installation?

  - by DanSogaard

  I'm about to release my application which is built in C# VS2008 to my customer, and I want to prevent copy abuse post deployment, since it's easy to copy installation files to another machine and use the application. I want to limit usage to only one computer per installation.

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• developing on a computer by remote desktoping into it, experiences?

  - by Blankman

  Hi, Does anyone (out of choice or forced) develop on a computer that they have to remote desktop into? How has your experiences been with it? I can see the advantages as you can basically code from anyplace in the world so long as you have a fast enough connection. Duplicate http://stackoverflow.com/questions/424869/reasons-to-use-a-vm-for-development

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• How to display a page in my browser with python code that is run locally on my computer with "GAE" S

  - by brilliant

  When I run this code on my computer with the help of "Google App Engine SDK", it displays (in my browser) the HTML code of the Google home page: from google.appengine.api import urlfetch url = "http://www.google.com/" result = urlfetch.fetch(url) print result.content How can I make it display the page itself? I mean I want to see that page in my browser the way it would normally be seen by any user of the internet.

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