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Re: static variables in methods Tom Archer5-May-02 4:46 Tom Archer 5-May-02 4:46  Don't you find that omission completely indefensable? Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Nish Nishant5-May-02 9:33 Nish Nishant 5-May-02 9:33  What purpose would be served by making a local scope variable static? Nish The posting stats are now in PDF:- http://www.busterboy.org/codeproject/ Feel free to make your comments. Updated - May 04th, Saturday Re: static variables in methods Tom Archer5-May-02 9:40 Tom Archer 5-May-02 9:40  Helps when writing recursive functions Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Nish Nishant5-May-02 9:51 Nish Nishant 5-May-02 9:51  Tom Archer wrote: Helps when writing recursive functions Oh! Can you further enlighten a confused newbie? Nish The posting stats are now in PDF:- http://www.busterboy.org/codeproject/ Feel free to make your comments. Updated - May 04th, Saturday Re: static variables in methods Tom Archer5-May-02 10:04 Tom Archer 5-May-02 10:04  On what a recursive function is or when you'd use one or ...? Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Nish Nishant5-May-02 10:09 Nish Nishant 5-May-02 10:09  Tom Archer wrote: On what a recursive function is or when you'd use one or ...? Blast!!! Not that!!!! I meant, I wanted to know how a static variable was going to be useful in a recursive function!!! Nish!!!! The posting stats are now in PDF:- http://www.busterboy.org/codeproject/ Feel free to make your comments. Updated - May 04th, Saturday Re: static variables in methods Tom Archer5-May-02 10:20 Tom Archer 5-May-02 10:20  That's a lot of excitement Nish. Are you sure you're taking your Lithium like you're supposed to If you write a function that can call itself (a recursive function) one way to maintain state information is via static variables because they won't reinitilaize in the function's prolog. Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Nish Nishant5-May-02 10:24 Nish Nishant 5-May-02 10:24  Tom Archer wrote: Are you sure you're taking your Lithium like you're supposed to Gosh! Not that old AI bot thing again Tom Archer wrote: If you write a function that can call itself (a recursive function) one way to maintain state information is via static variables because they won't reinitilaize in the function's prolog. I thought of that actually. But I thought since it was Tom Archer saying it, there ought to be a more complicated explantion to it Didn;'t think that the obvious one would be the only one. Nish The posting stats are now in PDF:- http://www.busterboy.org/codeproject/ Feel free to make your comments. Updated - May 04th, Saturday Re: static variables in methods Tom Archer5-May-02 10:35 Tom Archer 5-May-02 10:35  Sometimes even I can't over-complicate something Seriously, maintaining state information across call boundaries is the main reason for using static variables within a method. Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Nick Parker5-May-02 16:33 Nick Parker 5-May-02 16:33  Tom Archer wrote: On what a recursive function is or when you'd use one or ...? I think this is Tom trying to be funny. Nick Parker Re: static variables in methods Daniel Turini7-May-02 12:48 Daniel Turini 7-May-02 12:48  And can lead to several multithreaded problems if not carefully coded... Crivo Automated Credit Assessment Re: static variables in methods tomiga5-May-02 19:45 tomiga 5-May-02 19:45  Static variables sometimes are very usefull. You can use it or not... but in my opinion programmer should decided what he wants to use (in this case simply language dosn't support it - that's a pity) Tomiga Re: static variables in methods Neil Van Note5-May-02 20:08 Neil Van Note 5-May-02 20:08  The language supports class scope static variables; I don't see any reason why it should go any further. I have yet to see an instance, from an OOP standpoint, where it would beneficial to do otherwise. Regards Re: static variables in methods James T. Johnson5-May-02 14:17 James T. Johnson 5-May-02 14:17  Tom Archer wrote: Don't you find that omission completely indefensable? Yes, while you can fake it by putting static variables in the class; it doesn't do anything for variables you would like to keep localized only to the method. Maybe we can see it in v.next? James Simplicity Rules! Re: static variables in methods Neil Van Note5-May-02 14:58 Neil Van Note 5-May-02 14:58  In C++, static locals are shared among all instances of a class, not very useful for state information of a recursive function. I don't know if a C# incarnation would follow the same pattern. In C++ I have never found a good reason to use the feature unless it was for returning the reference to a static object that required more aggressive initialization than just plain assignment or to defer potentially expensive initialization of such an object until it was actually used (which could be never). Regards Re: static variables in methods James T. Johnson5-May-02 15:22 James T. Johnson 5-May-02 15:22  Neil Van Note wrote: In C++, static locals are shared among all instances of a class, not very useful for state information of a recursive function. Doh! You're right here; guess a regular class-level variable would be the solution James Simplicity Rules! Re: static variables in methods Tom Archer5-May-02 16:36 Tom Archer 5-May-02 16:36  Neil Van Note wrote: In C++, static locals are shared among all instances of a class, not very useful for state information of a recursive function. I disagree. You're making the assumption that the class will be instantiated many times. Neil Van Note wrote: In C++ I have never found a good reason to use the feature One example is how window procs were/are written without MFC. Another example if when iterating over a chain of entities where each function call works on a given link and a static variable is used to keep track of current position. Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: static variables in methods Neil Van Note5-May-02 17:28 Neil Van Note 5-May-02 17:28  Tom Archer wrote: I disagree. You're making the assumption that the class will be instantiated many times. In this case, I am. And you are assuming the class is a singleton, this was not noted in the discussion, and I have to assume that it is not and point the fact out. I code very defensively. Tom Archer wrote: One example is how window procs were/are written without MFC What does a local static have to do with the implementation of a class borne window procedure? This can be achieved very easily without it, and prove to be much more reusable. Tom Archer wrote: Another example if when iterating over a chain of entities where each function call works on a given link and a static variable is used to keep track of current position I cannot picture a situation where it would be used this way and prove more elegant than other straight forward solutions. Do you have an example? Regards Re: static variables in methods Eric Gunnerson (msft)7-May-02 9:27 Eric Gunnerson (msft) 7-May-02 9:27  IIRC, there are two reasons we didn't do it: 1) You don't get much additional utility over an instance or static variable. 2) They tend to cause subtle problems when you start dealing with multi-threaded use. They're also harder to find when you're looking for such issues. assembly (technical problem) tomiga4-May-02 3:05 tomiga 4-May-02 3:05  I was added an ActiveX control (MSChart) to my C# project and during running an exception is raised: An unhandled exception of type 'System.Resources.MissingManifestResourceException' occurred in mscorlib.dll Additional information: Could not find any resources appropriate for the specified culture (or the neutral culture) in the given assembly. Make sure "MainForm.resources" was correctly embedded or linked into assembly "Analyzer". baseName: MainForm locationInfo: Analyzer.View.MainForm resource file name: MainForm.resources assembly: Analyzer, Version=1.0.854.24542, Culture=neutral, PublicKeyToken=null What should I do (step by step solvation if possible, please) sqlconnection open dialog tomiga4-May-02 1:10 tomiga 4-May-02 1:10  Welcome How to show dialog which allows user to choose data source befor open connection to database. Using Visul C++ you can do: conn.Open(NULL) and what about C# (I use SqlConnection class) Tomiga can .net serve like an VBA? 3-May-02 19:59 3-May-02 19:59  I had just read the article "Runtime C# Expression Evaluator" in codeproject. It seems the compiler of C# or other .net language can be called by user program. Maybe it is possible to make new .net application customized by prepareing a interface to accept outside script (any language). Then user program call the comiler to compile the script as a plugin. Then we can have plugins by any language you like. can it be realized? Re: can .net serve like an VBA? Tom Archer4-May-02 4:14 Tom Archer 4-May-02 4:14  If I understand you correctly, you're asking if it's possible to add scripting language capabilities to unmanaged application that accept .NET languages. The answer is Absolutely! In order to implement this, you need to write a "CLR host" for the unmanaged application. In fact, Yukon - the next version of SQL Server - is still unmanaged, yet will allow users to program stored procedures with .NET languages (instead of being confined to using TSQL). Cheers, Tom Archer Author, Inside C# Author, Visual C++.NET Bible A total abstainer is one who abstains from everything but abstention, and especially from inactivity in the af Re: can .net serve like an VBA? 4-May-02 14:09 4-May-02 14:09  Thank for your info. My English is rather limited. What i really mean is if we create a fairly large application, we will need some macro or plugin ability just like VBA in Word, or VBS in Visual Studio. Now if the compiler is provided by language vender and we can call compiler in runtime and run the compiled result, then we have the capability to contain any language as a macro or plugin tool. So user will use C# or even Fortran to write plugin for NewWord. Can it be realized? Re: can .net serve like an VBA? James T. Johnson4-May-02 21:11 James T. Johnson 4-May-02 21:11  nova chen wrote: Now if the compiler is provided by language vender and we can call compiler in runtime and run the compiled result, then we have the capability to contain any language as a macro or plugin tool. So user will use C# or even Fortran to write plugin for NewWord. Can it be realized? Yes, but the Fortran.NET compiler would have to be on the users computer in order to use it. You also need to expose an API/object model to the script writers so they can do something to interact with your program. James Simplicity Rules!

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