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Attributes allow you to decorate code with various properties at compile time.
Then at runtime those properties can be examined and the data extracted. I'm thinking about writing an article for CP about this topic, I just need to come up with a different use for attributes so it doesn't clash with my commercial product 
An attribute can be nothing more than a flag, SerializableAttribute, or it can perform something useful, ToolboxBitmapAttribute.
I suppose, you could think of an attribute as a readonly property on a type.
VS.NET uses attributes internally, if you design a usercontrol numerous attributes can be applied to the class and its properties to effect the visual and usage outcome. You can specify the toolbox bitmap, which properties show up in the properties box, whether those properties are readonly, and if it has an UI Editor.
From what I've read COM doesn't let you specify many attributes, where .NET allows you to place an attribute on anything (even attributes have an attribute, AttributeUsage which specifies where it is valid to use an attribute)
James
Sonork ID: 100.11138 - Hasaki
"My words but a whisper -- your deafness a SHOUT.
I may make you feel but I can't make you think." - Thick as a Brick, Jethro Tull 1972
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James T. Johnson wrote:
I'm thinking about writing an article for CP about this topic,
And I would be your first reader.
I also read some of the msdn articles about this attributed programming. The key definition they give is...
Attributes, a new feature in Visual C++, are designed to simplify COM programming and .NET Framework common language runtime development. When you include attributes in your source files, the compiler works with provider dynamic-link libraries (DLL) to insert code or modify the code in the generated object files.
Unfortunately, I just got only a few information about attributes. But I am now wondering how I can apply attributes in my programming? What are the advantages of using attributes over properties... And finally how to create and use a owner-defined attributee???
Will your article cover these..........(Oh! please tell me yes)
omkamal
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omkamal wrote:
What are the advantages of using attributes over properties
I don't like saying one technique is better than another; its really just personal preference, but I hope when I'm done you'll find where using attributes makes sense and where a static property makes sense
omkamal wrote:
Will your article cover these..........(Oh! please tell me yes)
Right now I'm thinking of covering "Using existing attributes" and "Creating and using your own attributes", plus any glue that seems neccessary to blend the two topics. Plus I plan on including an example of writing and using your own attributes.
James
Sonork ID: 100.11138 - Hasaki
"My words but a whisper -- your deafness a SHOUT.
I may make you feel but I can't make you think." - Thick as a Brick, Jethro Tull 1972
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In .NET VC when viewing "Class View" one can click on a class in the tree and then click the lightning bolt (events), the dialog (messages) or the rhombus thingy (overrides) to create message maps and such. My question is, mine doesn't work anymore in my project. How do I get it to work again? This is just like the crap in VC.6 when the class view would get screwed up their. I hate this crap. Someone tell me what file to delete or modify to get it working again.
Thank you!
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Since I didnt have enough space in my disk, I did not install the documentation for VS.NET release version. But when I tried to convert one of my older c# application which uses the System.Windows namespace, to VS.NET final version, it is throwing a compilation error for "Windows is not found in the system namespace".
Did they move it? Or did they remove it?
omkamal
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I am not sure what was in System.Windows but the only ones I have that sound alike are System.Win32, System.Windows.Forms and System.Windows.Forms.Design.
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Never mind. I got it. My project was not referencing to the required dlls. So dont worry they are all there.
omkamal
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I realize this question has probably been asked and anwered already, but I'm am now ready to move from 6.0 to .NET. I want to continue with MFC and to ease myself into the .NET framework gradually. However, I am just curioes as to how much MFC has changed under .NET. Have they added a lot to it? Does moving into that environment buy that much for you? Or is it just as well to develope MFC apps with 6.0? In other words, is it just the same old MFC with a new wrapper?
"Thank you, thank you very much" Elvis.
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MFC has new classes, CString is templatized.
New stuff in ATL.
Faster Compiler.
Better IDE - excepted for touching up resource images.
Real easy to import VC6.0 projects.
Around thumbs up.
![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
Normski. - Professional Windows Programmer
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Thanks. How about XML support in the new MFC? Is that there? I've been hacking around with some DOM and SAX2 stuff and basically thinking it sucks. Has that improved?
I'm trying to find some documentation but can't seem find so much as a class heirarchy chart.
"Thank you, thank you very much" Elvis.
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Stan Shannon wrote:
Thanks. How about XML support in the new MFC? Is that there? I've been hacking around with some DOM and SAX2 stuff and basically thinking it sucks. Has that improved?
Yeah I know what you mean. AFAIK the only XML support is thru the .NET framework, which mean you have to branch into some managed code.
Normski. - Professional Windows Programmer
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Norm Almond wrote:
which mean you have to branch into some managed code
Oh, well, I suppose I have to make the leap sometime. Thanks, again.
"Thank you, thank you very much" Elvis.
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I have a couple of questions/concerns about GDI+.
I've seen a few people say that GDI+ was much slower than GDI. Messages were from October of last year, so I wonder if this have been improved in the final release of .NET (if it was updated at all)?
Also I am trying to figure out what is the deal with NULL pens (PS_NULL) in GDI+. I cannot seem to find anything about it. Do I just set my Pen* to NULL and do things like this:
if( pMyPen )
myGraphics.DoSomethingWithPen(pMyPen,...);
But it seems that executing if's in the loop will be much slower than passing a PS_NULL pen every once in the while. What am I missing here?
Thank you.
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1/ I rewrote a GDI paint program in GDI+ prior to OCtober and had no speed issues.
2/ Make the pen a color with an alpha of 0 and it will be transparent.
Christian
I have come to clean zee pooollll. - Michael Martin Dec 30, 2001
Picture the daffodil. And while you do that, I'll be over here going through your stuff.
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Thank you Christian. (I was hoping you were hanging around here about this time  )
1. I need to render a ton (A TON = maybe hundreds of thousands of iterations) of 2D shapes as fast as I can. Do you think it will be comparable to GDI speedwise.
2. Cool. How come I did not think of that? *scratching head* 
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Konstantin Vasserman wrote:
I need to render a ton (A TON = maybe hundreds of thousands of iterations) of 2D shapes as fast as I can. Do you think it will be comparable to GDI speedwise.
Even GDI is not good for real time stuff, that is why we have Direct Draw. The difference is if you use DD, you can build a GDI+ surface from DD directly, and vice versa, far more easily than using GDI.
As for the difference, I suspect there will be one, but not a huge one.
Christian
I have come to clean zee pooollll. - Michael Martin Dec 30, 2001
Picture the daffodil. And while you do that, I'll be over here going through your stuff.
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I have an app that can be extended by developing COM-Addins.
I can do this by creating an IDL and deploying a TLB. So, every customer can implement an interface and I create components at runtime by ProgID using CreateObject.
Ok, I assume there's something simillar (or even, better) in .NET. How do I do this in .NET ? I've seen something like Reflection or Remoting, but it seems too much trouble when compared to COM. Is there an easier way ?
Crivo
Automated Credit Assessment
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Hai,
I am trying to install VS.NET final version. While installing, at first it says to setup Windows Component Update. But when I click the link in the wizard, it says, "Setup has detected that another program requires to reboot the machine. Click ok to reboot the machine and start setup again....".
I have rebooted my machine zillion times. But no luck. I keep getting the same message. I have uninstalled all my previous versions of .NET. Any idea why this occurs? Is there any registry settings that I can change so that this would let me go thru the installation.
Please help me. I have a project deadline to meet.
omkamal
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There is a readme.html file on disk1,about these troubleshooting.
I don't have those disks now to check them for you but I remember that
some other programs need to be uninstall too,so check that file.
(Do you have SQLSerever installed,maybe for it,just guess)
omkamal wrote:
Is there any registry settings that I can change so that this would let me go thru the installation.
I didn't change any registery setting manually when I installed .Net finall
version
Mazy
Don't Marry a Person You Can Live With...
Marry Someone You Can Not Live Without
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The three main things that VS.NET readme.html says about uninstalling are...
1. Uninstall any previous versions of VS.NET -- Yes I did. check.
2. Uninstall any previous versions of .NET framework -- Yep. check.
3. Stop .NET Framework Support service, if listed in Services -- I couldnt find it. So thats a check too.
Its still not working... Strange thing is. I opened up the moreinfo.htm file in the Windows Componenet Update. I read how to bypass this component update if you have all the updates in your machine. It also said, how to install individual components that are missing in your macine. Certain things were missing in my machine. One of them FP Server extensions 2000. So I went to the corresponding folder in the CD to run the installation. Guess what, it said, "This version of FrontPage Server extensions cannot run on Windows 2000 machines. Visit http://www.microsoft.com/frontpage/fpse for details. I did go there I found, FPSE 2002. Ok. Latest version. So I installed that on my machine. Now it asks me to install IE6.0. But when I try to install IE6.0 I get the same error message.
"Another program needs to reboot your machine to complete its setup process. Please reboot and run setup again".
What the heck is the problem?
omkamal
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So switch to task manager and terminate all processes that you think they are not neccessary,or uninstall all program that you think they are not important or you can uninstall them temporary.
Mazy
Don't Marry a Person You Can Live With...
Marry Someone You Can Not Live Without
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Mazdak wrote:
uninstall all program that you think they are not important or you can uninstall them temporary.
Nope. No luck. 
I have uninstalled, SQL Server 2000 utilities, VB6.0, VI 6.0. I am only left with VS 6.0 (only VC in it). I can also go ahead and uninstall it. But do you think that could solve the problem??? I am a little skeptical!!!
omkamal
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Try running [CD-ROM]:\setup\Setup.exe /NO_BSLN_CHECK from Disk 1 (disable autorun or press shift while loading CD 1 into drive)
For example:
D:\setup\setup.exe /NO_BSLN_CHECK
This way, setup will run without running WCU.
Be sure to update your system using the standalone installers on the WCU disk
Crivo
Automated Credit Assessment
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I read this suggestion from moreinfo.htm in the Windows Component Update CD. But I am not able to install IE6.0. Can I install it after installing VS.NET??
omkamal
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