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The linux GUI also can't appease the average computer user...but that's another point.
Anyway, the loop to which you're referring is called a message pump. It just picks messages off the queue, gives hooks a chance to process it (and alternatively throw it out or modify it), then sends it down the right chain. And technically, there aren't really events in the Win32 API. Everything comes down to messages, more aptly called notifications. (Events can come from unmanaged code, however, through the CCW from connection points)
How Mono and dotGNU plan on doing it is beyond me. The Windows messaging system is both a blessing and a curse: in many ways, it makes application coding easy since you're handling notifications and don't have to manage a huge set of callbacks. For the same reason, it can also be bad. It's easy to loose messages down the chain if notified parents aren't careful. It's also a pain to port since no other OS (I've seen) works this way.
Frankly, though, I think they could redo System.Windows.Forms.dll without using Windows messaging. Sure, it wouldn't be the assembly from the .NET Framework BCL, but it could still have the same public classes and have it signed by the same key (for which I'm sure they'd have to send it to MS for official signing). Yeah, I know that defeats the purpose, but using a messaging system would be a fundamental change in a lot of libraries!
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Version: 3.21
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I understand the windows message pump (I just didn't remember than name). My question is how do other operating systems do it? They use events instead? Is that through subclassing/inheritance kinda like the MFC classes try to do?
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How would subclassing have anything to do with Windows messages? MFC is merely wrapper classes that handle those same exact messages but provide a OO way of doing it. Messages are still there, and you can still interact with them directly. If other OSes want to run the assemblies "as-is" from Windows, they're going to have to actually implement messages since the System.Windows.Forms.dll assemblies uses messages internally. That's probably why Mono et. al. are providing their own support for the BCL.
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Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
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>>
same public classes and have it signed by the same key (for which I'm sure they'd have to send it to MS for official signing). Yeah, I know that defeats the purpose...
<<
Absolutely agree that this defeats the purpose (unless MSFT is behind it).
However, I maybe wrong, but is it enough to be signed with the same MS key?
I maybe missing something, but isn't assembly hash value should match too -- If so I'm completelty confused, how would they be able to run WinForm.Control written on WinOS on Mono?...
"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me
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Yeah, the hash would have to be the same. So unless Mono or dotGNU added kernel support for messaging, System.Windows.Forms.dll won't be running on either.
BTW, good signature! Now if only PHB's though like us and hired real programmers rather than el cheapo code monkeys!
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The X Window System in Linux does use a message pump if I remember correctly.
Currently Mono plans to sovle the Forms problem in 2 ways (as is typical of open source).
1) Use Wine to run the Window Forms.
2) Use a completely different graphics API. The current leaders are Gtk# and Qt#
Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n
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Actually, on the Mono site there are provided different version. There is a type that is built using the Linux GUI and one that is going to use Wine32 to emulate Windows API. Their goal is to be completely compatible.
Personally, I wouldn't mind one that is compatible on both but does not using the standard Windows.Forms. As long as they came up with something that worked on both, I would switch 
Rocky Moore <><
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In a recent thread on the ndoc development list (for which I contribute), we were talking about the documentation of static constructors and that got me to thinking:
In most of my work, I use the approach for creating singleton objects by makeing a private constructor, then having a static property that returns an instance from which I can call other public or internal methods or properties. The whole thing looks like this:
public class Test
{
private string text;
private static Test instance;
private static volatile object syncRoot = new Object();
private Test()
{
this.text = "Test";
}
public static Test Instance
{
get
{
if (instance == null)
lock (syncRoot)
if (instance == null)
instance = new Test();
return instance;
}
}
public string Text
{
get { return this.text; }
}
}
This seems to be the method that Microsoft uses in the .NET BCL. And it works good. I do use static constructors in some things that aren't so sensative (like wrapping some GetDevice Win32 API code).
What I'm wondering is if static constructors work just as good as the method above? I haven't been able to find any documentation that discusses this in any detail, but my first reaction is that the first method is better because monitors are used and if would be thread-safe. But does the CLR invoke static constructors in a thread-safe manner on its own?
Reminiscent of my younger years...
10 LOAD "SCISSORS"
20 RUN
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acorrding to this article, the best way is thus:
sealed class Singleton
{
private Singleton() {}
public static readonly Singleton Instance = new Singleton();
}
as for your threading question: "What about thread-safe initialization? The Framework addresses this too. The Framework internally guarantees thread safety on static type initialization."
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Essentially, this is the same as using a static constructor. All statics that are initialized are done so in the .cctor specialname (the static constructor). Using the above syntax is merely a shorthand. So, you've actually described the same process.
The first method I described and coded doesn't rely about a static constructor except for the synchronization object, which is only used by the Monitor and is not indicative of the singleton itself.
I appreciate your answer though. The latter part was good to know. I've always suspected based on evidence, but I've never been able to find it in the documentation which I've read from start to finish several times. (and, oh, how the ending makes me cry! :P)
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I am making a photoshop-like toolbox, everything is fine except one probelm.
I have a form object as a childform of my main form.(after set the TopLevel property to false)
then the titlebar of the toolbox form would always be under the gray state?
So what's the matter with my implement?
thanks!
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But in this realization, what if I need another form with the same demand?
I mean, I want several forms being activated at the same time(not the gray title).
The function works well without this requirement, but I just want it to act as the normal expectation.
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What I exactly want is to show several forms as some 'toolboxes', and I don't want them to act like some dialogs that only one of them has its title bar highlighted at one point.And aslo these 'toolboxes' should act like the childs of the main form(constrained inside the bound of the main form and has a certain relative loocation in the main form).
Some child forms would do the second requirement, but the title bar thing cannot be satisfied.
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Thanks for your reply and code
But it seems you haven't got my point...
in your realization form2 and form3 still cannot have both of their title bar highlighted at the same time.
I can set the form3.TopMost property to true and form2.TopMost property to false to bring form3 to the top level(title bar highlighted) and bring form2 drawn behind(gray title bar). That's all I can do now.
The photoshop toolbox and layer panel etc. are somekind of forms that work like 'always at top', even above the mainform.
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thanks
Is it complex to use windows hooks to do the work?
Or only some invoke of win32 apis?
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Has anyone ever seen an documentation/examples on building a stand alone webserver? I'm intersted in creating a FREE tiny webserver that will allow advanced webserver like functions but able to be run from a CD/DVD or Hard Drive. I know that it is possible becase there are a couple of products like this out there.
If anyone has any ideas please let me know. I could really use a sample program with code. Or at least information that will point me in the right direction.
Thanks,
Josh
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There are several articles here on CP that deal with such issues, including reading from sockets, handling basic HTTP headers (which is relaly quite easy - it's what to do with some of them that gets difficult at times!), and serving pages. And, heck, since you're doing this in .NET, it wouldn't be hard to host ASP.NET pages. There's an entire namespace for this in .NET, and the classes are all there. There's really not much you have to do to provide basic services to ASP.NET pages (and controls, etc.).
One thing I would add (if you haven't already thought of it) is to effectively use caching, especially when run from a CD/DVD drive, as these things have very long latency times and very slow read times. It does sound like an interesting idea, though!
Reminiscent of my younger years...
10 LOAD "SCISSORS"
20 RUN
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Here is a table of a lot of Run-Time routines and then their mappings into the .NET World...
Link[^]
Good for those of us who have to work in both...
-Nathan
---------------------------
Hmmm... what's a signature?
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Yummy !
..Ctrl-P
..thanks !
FOR
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Great link, thanks.
-Nick Parker
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WiB wrote:
How to pass arguments in OnStart method of service?
Service supposed to start automatically at a boot time.
There is no way to pass arguments to a service at boot time, that is because the Windows API CreateService does not take any "default" argument. However, if you can create a service that is not started automatically at boot time and create a second service whose job is to start the first service at boot time, then you can pass arguments to the first service (using the StartService API).
<Edit>It is probably easier to</Edit> do it (the second service) in C/C++, by the way. If you don't want to bother writing a service in C/C++, you can use XYNTService[^] to start your service, passing any argument you want from the "command line" defined in the .ini file.
Click here to see my articles and software tools
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WiB wrote:
If I have an .INI file with arguments I can read this .INI file in OnStart method of service and I don't need to create second service, do I?
Yes, if you are satisfied with reading data from a file, then you don't really need to pass any argument. The second service makes it possible to pass arguments through command line at boot time.
WiB wrote:
In C# there is ServiceController class that controls services. What's the problem to create second service in C#?
No problem, I should have said "it is probably easier to ..."
Click here to see my articles and software tools
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WiB wrote:
If I start second service by calling StartService from first service, how do I pass arguments in service?
The StartService API can take arguments for the service to be started, if a service calls StartService to start another service, the arguments will be passed to the other service as if you have typed them from the command line. Of course, you have to get the arguments from within the first service. You don't need to do much when using a tool like XYNTService.
Here is how to use XYNTService to do what you need:
a) Copy XYNTService.exe to your local machine and install it with the following command:
<br />
XYNTService.exe -i<br />
b) Save the following text as file XYNTService.ini in the same folder:
<br />
[Settings]<br />
ProcCount = 1<br />
[Process0]<br />
CommandLine = c:\MyDir\XYNTService.exe -r MyService Arg1 Arg2 Arg3<br />
c) Reboot the machine.
When the machine is started, XYNTService will execute commands defined in the XYNTService.ini file, in this case, the command is
<br />
XYNTService.exe -r MyService Arg1 Arg2 Arg3<br />
The above command will call StartService passing Arg1, Arg2, and Arg3 to the service named MyService, MyService must not auto start at boot time. To stop your service from the command line, use the following
<br />
XYNTService.exe -k MyService<br />
Hope this helps.
Click here to see my articles and software tools
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[edit] the forum went beserk there for a second. no problem then