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Hi all
I wrote a Windows service and I installed the same on two machines. I gotto start the first instance of the windows service, if and onlt if the second one isnt running. I tried implementing this using the ServiceProcess class. At the time of executing the ServiceController.Stop line, am getting an exception saying that "Unable to open the service at this machine".
Is there anyway to do this?
Thanks in advance
Karthik
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Hi!
I have such problem:
- i make 3-tiered application, in which data access layer work on standalone computer (Server).
- I have some clients which use this server.
On server I have Framework 1.0 only!
But clients can have differ configurations:
- only framework 1.0
- only framework 1.1
- both frameworks
in case when client has only 1.1 version server sometimes throw strange exceptions. On Remoting of OleDbType I have exception that server can not create instance of object on his side.
<br />
'FastReporting.exe': Loaded 'c:\windows\assembly\gac\system.data\1.0.5000.0__b77a5c561934e089\system.data.dll', No symbols loaded.<br />
Strong Thread Exception: Exception: File or assembly name System.Data, or one of its dependencies, was not found.<br />
Does anybody know how to configure client or server to remove such problem?
Good Luck
Alex Kucherenko
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This is not realy whar i Need...
I can not install framework 1.0 for each client...
framework 1.1 does not contains dll version supported by server.
That is why I can not say client to downgrade version to 1.0.3300 dlls.
and server can not be upgrade to 1.0.5000 version, because server does not contains 1.1 framework dlls.
so here we have problem that 1.0 version dlls not compatible with 1.1 version.
Downgrade to previous version of framework does not work (in my case)!!!
must I synchronize versions of framewors on server and clients?
I don't want to do this... I think that must be a way how to configure server and clients.
Good Luck
Alex Kucherenko
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Add a FastReporting.exe.config file with this content:
<?xml version ="1.0"?>
<configuration>
<startup>
<requiredRuntime safemode="true" imageVersion="v1.0.3705" version="v1.0.3705" />
</startup>
</configuration>
Try some variations.
Why cant you just upgrade the server? Both runtimes should automatically be used for different assemblies.
<pre><a TITLE="See my user info" href=http://www.codeproject.com/script/profile/whos_who.asp?id=38829>leppie<a>::<a TITLE="Go to all articles written by me" href=http://www.codeproject.com/script/articles/list_articles.asp?userid=38829>AllocCPArticle</a>(<a TITLE="Go to my latest, greatest article!" href=http://www.codeproject.com/useritems/dfamachine.asp >Generic DFA State Machine for .NET</a>);</pre>
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Upgrade server is still the only one solution for this problem...
I want to find more then one solution (if it exists  ).
Thanks for help.
Good Luck
Alex Kucherenko
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OK first some easy stuff:
There is a few good articles in April 2003 MSDN on sidebyside execution.
What is happening in your case (afai can figure it out):
1. Server defines an interface
2. Client implements interface
3. Client send inteface to the server
4. Server loads implemetation class. KABOOM!!!
How can this be? Simple, the client has made a reference to the culprit assembly (OleDB in your case, that is new in 1.1). This is however not desirable.
Like I said, installing 1.1 on the server, should automatically resolve these issues. Not doing this, leaves with 3 options:
1. Prevent the client from using "new" libaries. This not however desirable either, although I think the 1.1 compiler can compile for 1.0 compatibilty (this would be nice).
2. Use Remoting. This will be painfull, but will allow you to do more.
3. Compile any source at a single point, e.g. the server.
So I guess its back to the drawing boards for you 
Hope it helps 
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Does anyone know what factors affect the memory size an object will consume by simply creating a new instance? I know that member-level value-types will consume memory respective of their data type (Int32 consumes 4 bytes, etc.). What about code? Does a class that contains no member variables, but 2000 lines of code consume any memory by simply instantiating a new one?
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CBoland wrote:
Does anyone know what factors affect the memory size an object will consume by simply creating a new instance? I know that member-level value-types will consume memory respective of their data type (Int32 consumes 4 bytes, etc.). What about code? Does a class that contains no member variables, but 2000 lines of code consume any memory by simply instantiating a new one?
Generally, no. Since .NET is garbage collected, an instance of a class needs some information for garbage collection and Reflection. IIRC, any Object instance on .NET takes 16 bytes of memory. Another common source of "hidden" memory consumption on OOP environments are virtual methods.
ORACLE One Real A$#h%le Called Lary Ellison
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Code shouldnt affect memory.. but if you have declared any virtual functions or derived from some some asbtract base class.. it will as vtable does require some space..
And any static variables also consume.. but only once..
aravinthan
<hr>
Visit me:
http:
When you know something.. its meant to share with others :-) for otherwise that knowledge has no worth:-)
mail me:
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<hr>
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Hi guys.....Im trying to run this application on mi VS.net and (considering that Im kinda of a newbie on this) I cant follow the instructions cuz they dont match.
Can someone please take a look at this and let me know what they think...
http://www.devbuzz.com/content/zinc_evb_comm_control_pg1.asp
any help?
X-ZD Designs
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Hi all, hope some one can help here
I have this in C#:
void Save(){}
bool Execute(){}
bool Process()
{
Save();
return Execute();
}
.NET generates the following IL:
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: call instance void Save()
IL_0006: ldarg.0
IL_0007: callvirt instance bool Execute()
IL_000c: stloc.0
IL_000d: ldloc.0
IL_000e: ret
Now why does it not do this?
IL_0000: ldarg.0
IL_0001: call instance void Save()
IL_0006: ldarg.0
IL_0007: callvirt instance bool Execute()
IL_000c: ret
I mean this does mean this "do" this same doesnt it? Is there a reason for this behaviour?
Cheers
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Theoretically, there’s no good reason to optimize IL code, so I think MS didn’t put too much effort on it. What you showed should be done by the JIT, anyways.
ORACLE One Real A$#h%le Called Lary Ellison
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Daniel Turini wrote:
Theoretically, there’s no good reason to optimize IL code, so I think MS didn’t put too much effort on it. What you showed should be done by the JIT, anyways.
Thanks 
So those 2 are == ? If I write IL manually, can I write it either way then?
What triggered me to ask this , is that method overhead does add up, even though its only about 5ns a call, but call that 100,000 times and it makes sense to inline a method, if possible. It appears the JIT is NOT inlining small methods eg operater overloads. Is there a way to force this without having to manually edit the IL?
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leppie wrote:
So those 2 are == ? If I write IL manually, can I write it either way then?
What triggered me to ask this , is that method overhead does add up, even though its only about 5ns a call, but call that 100,000 times and it makes sense to inline a method, if possible. It appears the JIT is NOT inlining small methods eg operater overloads. Is there a way to force this without having to manually edit the IL?
==? In theory, yes.
IIRC, the JIT inlines any method with less than 32 IL bytes.
One thing to notice is that the JIT can't inline a virtual method, because the proper method to call is only known at the time of the call, and can change from call to call. BTW, virtual method calls are very expensive.
If you need such degree of control, I suggest you that, before going into ILASM, try managed C++, at least for the critical part. It's not that beautiful, but you still have templates and some form of inline control.
And if the "inline" keyword doesn't help, you can always resort to macros
ORACLE One Real A$#h%le Called Lary Ellison
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Daniel Turini wrote:
BTW, virtual method calls are very expensive.
I didnt spot that 
The whole program will be ported to C (for CS) once I have finished it, so I will keep those things in mind. Maybe make some IL "macros" ?
Thanks for the help
PS: You know of any good (free) IL resources, besides SSCLI and the Tool Developer Guide?
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leppie wrote:
PS: You know of any good (free) IL resources, besides SSCLI and the Tool Developer Guide?
Nope. Actually, I almost only use the good old compile, "let's see in ILDASM" and System.Reflection.Emit documentation.
The cordbg.exe, if you don't mind using a so beautiful interface, is a very good source for finding how the JIT is behaving. It's a bit hard, you need to know x86 ASM (it's not THAT different from IL), generate a Release version with debug info, and use "m JitOptimizations=1" to be sure that JIT will optimize code. Then, debug with that beautiful interface until you reach the call you need to check and use "dis" to see the native instructions.
ORACLE One Real A$#h%le Called Lary Ellison
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Daniel Turini wrote:
Then, debug with that beautiful interface until you reach the call you need to check and use "dis" to see the native instructions.
I tried that, and the debugger skipped the bp with JITOpt 1, so I assume it gets inlined.
Just one final question (I promise):
How does one view the contents of the evaluation stack?
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For a long time I've found it convenient to stick pictures I want to share with friends in the wwwroot folder and send a link, rather than sending the whole file to them. It's worked perfectly until now. It seems to have stopped working as soon as I installed the v1.1 Framework, and those who try to access even old content now get a 404 error or an access violation message. I can't even troubleshoot it myself because it works fine for me here. Paul Watson suggested a change to a setting in machine.config, processModel.user = SYSTEM instead of machine, but it didn't help. What else might need to be changed to restore the functionality of the server?
[EDIT]
Thanks to some judicious testing by Paul, the culprit was revealed to be the firewall, installed the same week as the Framework. I hate it when I can't even test things myself!!![/EDIT]
"Ask not for whom the bell tolls;
It tolls for thee..."
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hi there.
i want to write a control for comfortable scrolling on a touchscreen (in fact only two buttons up/down )
now i'm searching for the right method for scrolling the client-area up or down..
any idea?
thanks,
phil
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I have System.Windows.Forms.Panel with scroll area
larger than the visible window of the panel and
AutoScroll property on the Panel element set to true.
I have placed few UI elements in the panel that are
outside the visible window of the panel, which needs to
be scrolled to be seen. By default these elements are set
to visible=false.
However, when I toggle the "Visible" property TRUE/FALSE
on the elements that are outside the Panel's visible
window area, the scrollbar provided by
System.Windows.Forms.Panel does show up but it
miscalculates and displaces
the elements in the panel arbitrarily. Did any one run
into this problem. Any workarounds?
Thanks in advance.
Best Regards
Ven
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How do I take an arbitrary string and UTF8 encode it using System.Text.Encoding.UTF8? I found out how to write strings and how to convert byte data, but not how to convert strings. You'd think this would be easier; maybe I'm missing something.
(I'm using C# by the way).
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Use Encoding class in System.Text namespace.
Basically to convert, you first set up encoding. Let's say you have a simple string that you named simpleS. Here is the code that would convert:
Encoding ascii = Encoding.ASCII;
Encoding utf8 = Encoding.UTF8;
byte[] simpleBytes = ascii.GetBytes(simpleS);
byte[] newbytes = Encoding.Encode(ascii, utf8, simpleBytes);
that's it. Key here is static Encode method provided by Encoding class. Once you have the new byte array, you can convert it to char array of utf8 encoded chars.
I hope this is of some help. MSDN documentation also has a very similar example and more stuff on this encoding. I know I used it for the project I worked some time ago.
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the method of msdn can only used in the case that you exactly know which
version of framework installed in client machine.
But generally we are in this case that we build a application under
framework1.1 and we don't know the version of framework on client machine.So
it seems the only way that we can do is bet the version of client.My god!!!
I mean we can not let the same copy of 1.1 application run either on framework1.1 or on framework1.0.
Is that true??
lost my way
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why don't you just install the 1.1 framework? The two frameworks will run side by side - the only issues I have come across is that 1.0 ASP.NET apps will have to cope wioth the new 1.1 security feature of not allowing tags (and other things) to be placed in element data. i.e "<a" typed="" in="" an="" edit="" box="" will="" throw="" error="" 1.1="" and="" 1.0="" if="" not="" handled="" or="" prepared="" for="" when="" is="" installed.=""
<p="" align="right">Technically speaking the dictionary would define Visual Basic users as programmers.
But here again, a very generalized, liberal definition is being employed and it's wrong
- just plain wrong - Tom Archer 5/12/02
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I am sure a lot of you have come across .NET based portals such as IBuySpy and DotNetNuke.
Has anyone else come across other portals based on the .NET framework?
The only other one I have come across is PassagePortal (www.cubiccompass.com).
Any suggestions? And any suggestions to other portal frameworks written in say perl/php/asp/jsp etc
(I am sure there must be a few I have missed in my google searching)
Technically speaking the dictionary would define Visual Basic users as programmers.
But here again, a very generalized, liberal definition is being employed and it's wrong
- just plain wrong - Tom Archer 5/12/02
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