.NET (Core and Framework) Discussion Boards

Joao Vaz13-Feb-03 20:48

13-Feb-03 20:48

.S.Rod. wrote:
I am not aware of such stuff inside the .NET CLR.

You've got dedicated functions in the WIN32 File I/O APIs, including ReadDirectoryChangesW, etc.

Thanks , I resorted to another technique , using win32 api on one client side app , and recording the data on the database on the Server side.

.S.Rod. wrote:
Now this require WIN32 interop.

Oh well, perphaps on the 2nd version, they'll put the rest of the windows api on it (insert dreamer icon here...)

Cheers,Joao Vaz
And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary.-Shog9

Remember just because a good thing comes to an end, doesn't mean that the next one can't be better.-Chris Meech

Re: Checking file changes

Giles21-Feb-03 3:59

Giles

21-Feb-03 3:59

This class implements the equivelent Win API calls to monitor a file, or change in a directory.

System.IO.FileSystemWatcher

Quote from a clever bloke :

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones." - Albert Einstein

Re: Checking file changes

Stephane Rodriguez.22-Feb-03 0:44

Stephane Rodriguez.

22-Feb-03 0:44

Yo!

Re: Checking file changes

Giles23-Feb-03 5:17

Giles

23-Feb-03 5:17

I'm guessing that the kitchen sink is in there somewhere. The .NET class lib seems to have everything, its just a case of finding it. Big Grin | :-D

Quote from a clever bloke :

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones." - Albert Einstein

Re: Checking file changes

Stephane Rodriguez.23-Feb-03 5:25

Stephane Rodriguez.

23-Feb-03 5:25

What we are lacking is a Find option in Anakrino! Wink | ;)

(unfortunately, I have tried to recompile this masterpiece but couldn't download everything required to do so).

Re: Checking file changes

Giles21-Feb-03 3:58

Giles

21-Feb-03 3:58

Could have a look at System.IO.FileSystemWatcher

Quote from a clever bloke :

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones." - Albert Einstein

Re: Checking file changes

Joao Vaz21-Feb-03 6:19

Joao Vaz

21-Feb-03 6:19

Giles wrote:
Could have a look at System.IO.FileSystemWatcher

This resolves the things on the server-side, and since I already resolved the client-side problem Smile | :)

Thanks

Cheers,Joao Vaz
And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary.-Shog9

Remember just because a good thing comes to an end, doesn't mean that the next one can't be better.-Chris Meech

User controls in toolbox?

Jörgen Sigvardsson8-Feb-03 7:51

Jörgen Sigvardsson

8-Feb-03 7:51

This may be totally wrong forum, but I couldn't find a general forum for Visual Studio .NET.

Is there a way to put my own .NET user controls in the IDE toolbox and then just drag and drop them onto my forms? That would be very nice indeed.

--
"It is amazing how f-ing crazy I really am."

Re: User controls in toolbox?

leppie8-Feb-03 9:05

leppie

8-Feb-03 9:05

Right click the toolbox, select Customize toolbox..., browse for your assembly, and there . Magic! All Component derived classes will be on the toolbox, ready to drag onto the form. NOTE: youre class MUST have a default constructor.

Smile | :)

MyDUMeter: a .NET DUMeter clone

Re: User controls in toolbox?

Jörgen Sigvardsson8-Feb-03 9:14

Jörgen Sigvardsson

8-Feb-03 9:14

Sweet!

I didn't spot the Browse button before. This is excellent! VS.NET is even smart enough to not lock the assembly. (The control I'm working on is in the same project, thus it's possible to recompile/link)

Thanks for your reply!

--
"It is amazing how f-ing crazy I really am."

Re: User controls in toolbox?

leppie8-Feb-03 9:23

leppie

8-Feb-03 9:23

Jörgen Sigvardsson wrote:
VS.NET is even smart enough to not lock the assembly. (The control I'm working on is in the same project, thus it's possible to recompile/link)

It would be easier to click (in project), Add, Inherited UserControl and select the control. Smile | :)

Also gives you more control over the UI.

MyDUMeter: a .NET DUMeter clone

Re: User controls in toolbox?

James T. Johnson8-Feb-03 12:33

James T. Johnson

8-Feb-03 12:33

Jörgen Sigvardsson wrote:
Is there a way to put my own .NET user controls in the IDE toolbox and then just drag and drop them onto my forms? That would be very nice indeed.

In the next version of VS.NET (2003) it gets easier. Tt has a tab dedicated to user controls in your project so you can just drag/drop from there. The functionality is there in VS.NET 2002 (user controls are at the very bottom of the Windows Forms tab), but it is a bit buggy in that sometimes it doesn't show the controls.

I'm not sure if either version will show user controls that are contained in other projects than the one you are working on.

James

"It is self repeating, of unknown pattern"
Data - Star Trek: The Next Generation

Re: User controls in toolbox?

Jörgen Sigvardsson8-Feb-03 13:00

Jörgen Sigvardsson

8-Feb-03 13:00

James T. Johnson wrote:
In the next version of VS.NET (2003) it gets easier. Tt has a tab dedicated to user controls in your project so you can just drag/drop from there.

Heh, that's how I imagined it should work! I think I've dragged pretty much everything in VS.NET that's detachable into that damn toolbox. Thanks to leppie, I sorted it out though. I did manage at one point to drag the code(!?) of the control into the toolbox. Unsure | :~

James T. Johnson wrote:
I'm not sure if either version will show user controls that are contained in other projects than the one you are working on.

It would be nice if it would work like many Java IDE's: You register a user control as "reusable" and it'll be in the IDE for future use. Preferrably you can label it with a category tag such as "Textboxes", "Listviews", etc. And of course, the IDE should report what assemblies these controls live in so you don't have to search for them all night just before shipment day.. Roll eyes | :rolleyes:

I often find myself reimplementing wheels over and over again. I think this would save me a couple of hours per project. This was possible in VC6 with ActiveX controls, I see no reason why it couldn't be the same in VS.NET with .NET controls.

--
"And God said, Let us make man in our image"

using Process.Container

Kiff5-Feb-03 12:42

Kiff

5-Feb-03 12:42

How to add new Components to Process.Container property?

I get a null object reference error when using Process.Container.Add().

XmlSerializer needs default constructor

moredip5-Feb-03 6:25

moredip

5-Feb-03 6:25

Hi all,

Does anyone have a nifty workaround for the fact that a class that uses XML Serialisation is required to have a default constructor?

I've got a class AuthorInfo, that has a readonly ID variable, that is set in the constructor:

//C# Class...
public class AuthorInfo
{
public readonly m_ID;

public AuthorInfo( uint ID )
{
m_ID = ID;
...
...
}
...
...
}

I'd like this class to be serialised to XML but as noted in MSDN:

"A class must have a default constructor to be serialized by XmlSerializer"

I don't really want to create a default constructor for this class, as I'd like to enforce the fact that it can't be created without an ID being supplied.

Can anyone think of a good way to do this? The only thing I can think of off the top of my head is to create an internal helper class that just deals with Serialisaton. That seems a bit messy to me, and would be awkward to use with Web Services (which is what I'm doing).

Any suggestions/comments appreciated...

TIA,

Pete

Re: XmlSerializer needs default constructor

Giles13-Feb-03 5:50

Giles

13-Feb-03 5:50

You could use a Static Constructor to initialise an internal static countID variable to zero, that just gets incremented and stored in a non-static member as a new ID in the default constructor. Other than that and what relationship the ID has to other data its a little difficult to say.

Quote from a clever bloke :

"I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones." - Albert Einstein

Need help regarding marshaling

Thomas Freudenberg5-Feb-03 4:50

Thomas Freudenberg

5-Feb-03 4:50

Hi all,

in my C# app I have to call a function in a legacy Win32 DLL. This function fills a complex struct. Unfortunately, I don't know how to port the data structure to .NET. Here's a simple example:

public class Test
{
    [StructLayout(LayoutKind.Sequential)]
    public class Test
    {
        int i;
    }
 
    [StructLayout(LayoutKind.Sequential)]
    public class Test2
    {
        [MarshalAs(UnmanagedType.ByValArray, SizeConst=10)]
        public Test1[] tests;
    }
 
    public Test()
    {
        int size = Marshal.SizeOf(typeof(Test2));
    }
}

In the constructor, Marshal.SizeOf throws the exception Type Test2 can not be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

How do I marshal fixed size arrays of struct properly?

Thanks in advance.

Regards
Thomas

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Re: Need help regarding marshaling

Heath Stewart5-Feb-03 4:57

Heath Stewart

5-Feb-03 4:57

First, those need to be structs. Second, you may need to specify the Test1 struct size, not just the number of elements. If you expect a variable number of elements, you should look at the SizeParam(?) property of the MarshalAsAttribute to specify the index of a member that specifies the number of elements in the struct array.

Reminiscent of my younger years...
10 LOAD "SCISSORS"
20 RUN

Re: Need help regarding marshaling

Thomas Freudenberg5-Feb-03 5:03

Thomas Freudenberg

5-Feb-03 5:03

Heath Stewart wrote:
First, those need to be structs.

Ok, but it doesn't help at the moment.

Heath Stewart wrote:
Second, you may need to specify the Test1 struct size, not just the number of elements. If you expect a variable number of elements, you should look at the SizeParam(?) property of the MarshalAsAttribute to specify the index of a member that specifies the number of elements in the struct array.

It's fixed sized, therefore I used SizeConst. Confused | :confused:

Thanks anyway.

Regards
Thomas

Re: Need help regarding marshaling

leppie5-Feb-03 6:12

leppie

5-Feb-03 6:12

I had the same problem and the only way is to Marshal it as a byte[] array and not the encapsulating class. If the class has more members, things become a bit more difficult.

MyDUMeter: a .NET DUMeter clone

Re: Need help regarding marshaling

Thomas Freudenberg5-Feb-03 6:27

Thomas Freudenberg

5-Feb-03 6:27

leppie wrote:
If the class has more members, things become a bit more difficult.

In fact, the structurs are cascaded about three levels Dead | X|

Regards
Thomas

Re: Need help regarding marshaling

leppie5-Feb-03 7:00

leppie

5-Feb-03 7:00

I think it is time for a Custom Marshaller. You need to implement this interface.

public interface ICustomMarshaler
{
 public void CleanUpManagedData(object ManagedObj);
 public void CleanUpNativeData(IntPtr pNativeData);
 public int GetNativeDataSize();
 public IntPtr MarshalManagedToNative(object ManagedObj);
 public object MarshalNativeToManaged(IntPtr pNativeData);
}

And set MarshalAs(UnmanagedType.CustomMarshaler) on the class. From there you should havenough control to marshal just about anything. Note: You can now make classes without Layout.

Cheers Smile | :)

MyDUMeter: a .NET DUMeter clone

Re: Need help regarding marshaling

Thomas Freudenberg5-Feb-03 7:05

Thomas Freudenberg

5-Feb-03 7:05

leppie wrote:
I think it is time for a Custom Marshaller.

OMG | :OMG:

Ok, it's an opportunity to learn something new Wink | ;)

BTW, I am not the only one with this problem: http://www.dotnet247.com/247reference/msgs/28/141537.aspx[^]

Regards
Thomas

Problem with ASPNET Worker Process (aspnet_wp.exe)

Vasudevan Deepak Kumar4-Feb-03 22:40

Vasudevan Deepak Kumar

4-Feb-03 22:40

Hi,

This is my followup to my previous question. Even after I choose to 'End Process'/'End Process Tree' of aspnet_wp.exe, because it is taking too much of resources, it keeps spawning a new instance, and even after ensuring that no HTTP requests are being sent. I have closed all browsers and all VS.NET windows.

And this instance is taking too much of memory too.

What is the problem?

Deepak Kumar Vasudevan
http://deepak.portland.co.uk/

Re: Problem with ASPNET Worker Process (aspnet_wp.exe)

leppie5-Feb-03 10:19

leppie

5-Feb-03 10:19

Deepak Kumar Vasudevan wrote:
Even after I choose to 'End Process'/'End Process Tree' of aspnet_wp.exe, because it is taking too much of resources, it keeps spawning a new instance, and even after ensuring that no HTTP requests are being sent. I have closed all browsers and all VS.NET windows.

This is default behaviour. In case one application crashes another.

Deepak Kumar Vasudevan wrote:
And this instance is taking too much of memory too.

It should not be. ASP.NET is stateless in nature. WHy is it taking so much memory? Can you not unload some memory?

MyDUMeter: a .NET DUMeter clone

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