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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! any tools to analyse performance of C# 3-May-02 19:32 3-May-02 19:32  Is there any tools to analyse the performance of C# program? What i care about is the speed of procedures in an algorithm. I use VS7, but can't find a tool like profiler in VC6. Tried to write a profiler for C# like the QProfile in CodeGuru, but i find it impossible because C# doesn't accept static variable in procedure. Then measure the time cost of a single procedure is not easy, or will cost a lot (for example use a string name or a unique number as a hash key to show which procedure is the profiler reached). Any suggestion? Re: any tools to analyse performance of C# Neil Van Note3-May-02 20:48 Neil Van Note 3-May-02 20:48  I have been using Compuware/Numega DevPartner Profiler (Community Edition). It's Free. Still waiting for the sales rep to call back when the Studio suite is available for VS.NET, they said around june for the upgrade from version 6.6. It's not Free. Re: any tools to analyse performance of C# Neil Van Note3-May-02 23:28 Neil Van Note 3-May-02 23:28  BTW, If you do decide to check out the afore mentioned tool, a word of warning. The installer that I used did NOT suggest to reboot my machine after it was finished. Reboot your machine after installing it and before you actually run it. Otherwise VS.NET might do it for you. It BSOD’d my machine. Sorry if it already bit you, it’s just been a long time since I installed it, it slipped my mind. Regards Re: any tools to analyse performance of C# Maxwell Chen4-May-02 0:25 Maxwell Chen 4-May-02 0:25  Neil Van Note wrote: It BSOD’d my machine. What's "BSOD" ?? Maxwell Chen People say "No news is good news". Then, no code is good code!? Re: any tools to analyse performance of C# James T. Johnson4-May-02 0:28 James T. Johnson 4-May-02 0:28  Blue Screen of Death, in other words windows got messed up to the point it couldn't recover. James Simplicity Rules! Re: any tools to analyse performance of C# Neil Van Note4-May-02 1:14 Neil Van Note 4-May-02 1:14  Like James said, It torked my machine bad enough that it decided it was time for a reboot. Although, Under XP I choose to call it the Black Screen of Death... I thought is was cute how XP volunteers to phone home to MSFT after a crash though. Re: any tools to analyse performance of C# 4-May-02 14:38 4-May-02 14:38  Ohh, a fairly good tool. I download and run the 6.7 prerelease. It work smoothly and have not find any BSOD yet But still some limits according to my usage, I wanna analyse some procedure not all. The later solution give too many data that confused my eyes. i will rather have a library like QProfile. You can manually write a static object in a procedure you focused. when in its contruction take a time mark and in its destruction take another. then have the subtration of them, we have a time span of one run. Finally have several run's spans summed, you have the time cost of this procedure in your application. But this design is difficult to apply on C# because it shorts of the feature of static variable in procedure(function). Re: any tools to analyse performance of C# Neil Van Note5-May-02 15:27 Neil Van Note 5-May-02 15:27  It does have such features, plus an API, although I don't know if they are present in the community version. DoubleBuffering and String Question Nick Parker3-May-02 9:59 Nick Parker 3-May-02 9:59  Can someone give a a good explanation of what DoubleBuffering is. Also while I am making requests , since the String data type is immutable(Am I correct?) is there a mutable data type like StringBuffer available in C# like there is in other languages? Someone clear me up on this. Thanks. Nick Parker Re: DoubleBuffering and String Question Neil Van Note3-May-02 10:35 Neil Van Note 3-May-02 10:35  System.Text.StringBuilder Re: DoubleBuffering and String Question Neil Van Note3-May-02 10:37 Neil Van Note 3-May-02 10:37  In short, double buffering is the act drawing to an off-screen graphics context and then blitting it to the screen in one action. Sorry No time for a good explanation. Re: DoubleBuffering and String Question Daniel Turini7-May-02 13:04 Daniel Turini 7-May-02 13:04  DoubleBuffering is a common graphics drawing algorithm. Basically, you "draw" everything in a bitmap in memory. When a screen refresh occurs, you put your drawn bitmap on the video memory. This way, you avoid partially drawn frames: they are ugly and kills action and animation on a game or multimedia app, for example. Even a common form on the screen can be improved with doublebuffering, because the app appears to be faster and more responsive. Movement with double buffering usually is very smooth. But there is no free lunch. First, you have two writes and a performance hit: one write on main memory, second a data transfer to the video card (ok, normally very fast). Second problem: because you only transfer the buffer to screen when it's drawn, performance falls at fractions of video refresh speed. E.g: you make a simple animation and double buffer to a 60Hz video mode. So, you get 60 FPS (frames per second). So, you start adding more details to each frame and keeping 60FPS. Suddenly, you add a little more detail and animation falls to 30FPS. A little more and 15FPS. A little more and 7 FPS. So, your very responsive app can become a slow one. I'm not sure (because of my english) if I was clear enough. There are (lots of) other animation algorithms and some workarounds to the problems I told you, but the basic issues are those. Crivo Automated Credit Assessment Re: DoubleBuffering and String Question Nick Parker8-May-02 3:31 Nick Parker 8-May-02 3:31  Thanks that was a great explanation really, very well put. Nick Parker DoubleBuffer in Window Form Controls... Joshua Guy3-May-02 9:11 Joshua Guy 3-May-02 9:11  I have create a custom Windows form control and enabled the built in double buffering with: this.SetStyle(ControlStyles.DoubleBuffer & ControlStyles.UserPaint & ControlStyles.AllPaintingInWmPaint, true); but this does not help my flicker problem at all... From what I have read that will work in controls, Right?.?. Joshua Guy Sonork ID: 100.9944 ICQ: 519642 Hotmail: JoshuaJGuy@hotmail.com Re: DoubleBuffer in Window Form Controls... Neil Van Note3-May-02 9:20 Neil Van Note 3-May-02 9:20  this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint, true);

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