.NET (Core and Framework) Discussion Boards

Stefan Bolder2-Nov-02 0:17

Stefan Bolder

2-Nov-02 0:17

I have an application that uses a custom image format.
What I am trying to do is make it possible to switch to
'thumbnails' in an explorer window, and have it show the thumbnails,
or when selected show it as a preview in the left pane (just like JPG's
and GIF's do already). How do I go about doing this? Just register the file type? or do I need to fiddle with the .net system.drawing.image encoder class?

Thanks!

Re: image encoder? II

Stefan Bolder2-Nov-02 0:41

Stefan Bolder

2-Nov-02 0:41

Forgot to Add: I REALLY want this custom fileformat to be openable by
the 'windows picture and fax viewer' as well.

Re: image encoder? II

Stephane Rodriguez.2-Nov-02 1:52

Stephane Rodriguez.

2-Nov-02 1:52

Why should it be anything different than standard listctrl thmubnailing such as the one detailed here[^] ?

Countdown Countdown before me becoming an Artech employee : D-28.

Re: image encoder? II

Stefan Bolder2-Nov-02 22:40

Stefan Bolder

2-Nov-02 22:40

because I want the thumbnail to be in windows, not my own app?
Just add 'native support' for that certain fileformat so that
explorer.exe will display it in thumbnail mode.

Re: image encoder? II

Stephane Rodriguez.2-Nov-02 22:40

Stephane Rodriguez.

2-Nov-02 22:40

Ok, why .NET then?

Browsing folders in thumbnail/preview mode is already slow. If you add .NET on top of that, nobody will stand it more than 30 seconds.

You are doing low-level here, and COM/C++ is the de facto language for that.

My 0.5 cent.

Back to real work : D-27.

EventHandler Behavior

EricK71-Nov-02 9:16

EricK7

1-Nov-02 9:16

I have a Windows.Form that handles events from an object that is executing on a different Thread. I use the following code (modified for posting) to handle events that use a custom EventArgs class:

Private Sub TheEventHandler(ByVal sender As Object, ByVal args As CustomEventArgs)
    If Me.InvokeRequired Then
        Me.BeginInvoke(New TheClass.CustomEventHandler(AddressOf TheEventHandler), New Object() {sender, args})
    Else
        ...
    End If
End Sub

This works fine. I use the following code (modified as well) for handling events that are defined using EventHandler and are passed EventArgs.Empty:

Private Sub TheEventHandler(ByVal sender As Object, ByVal args As EventArgs)
    If Me.InvokeRequired Then
        Me.BeginInvoke(New EventHandler(AddressOf TheEventHandler), New Object() {sender, args})
    Else
        ...
    End If
End Sub

When the code is executing on the non-GUI thread, the sender variable references the object executing on the other Thread (as it should since I fire the event passing Me as the source). However, after the "recursive" call to itself back on the GUI thread, the sender object references the Form that is handling the event. Why is the object being passed into BeginInvoke as the first item in the args array being replaced by the Form object? This doesn't happen in the case of non-EventHandler events (at least ones I created).

Any ideas?

I know I can get around it by just writing my own empty EventHandler delegate, but that seems silly...

Remoting hangs when accessing a class with a COM + Reference

Dam_f31-Oct-02 7:29

Dam_f

31-Oct-02 7:29

I am using .NET Remoting to access a Class Library that I created in VB.NET.
This class library contains a reference to a COM + component that is used by
several functions. I am able to get the Remoting to work for most functions
but as soon as I try and call a function that is using the COM + component
the app freezes. I don't get any error messages, it just seems to hang. Is
there something I need to do in order to use a COM + component when
Remoting?

.NET Remoting

Dam_f31-Oct-02 4:59

Dam_f

31-Oct-02 4:59

I am using .NET Remoting to access a Class Library that I created in VB.NET. This class library contains a reference to a COM + component that is used by several functions. I am able to get the Remoting to work for most functions but as soon as I try and call a function that is using the COM + component the app freezes. I don't get any error messages, it just seems to hang. Is there something I need to do in order to use a COM + component when Remoting?

Re: .NET Remoting

ian mariano2-Nov-02 7:48

ian mariano

2-Nov-02 7:48

YOu have to use COM interop services of .NET to use unmanaged COM/COM+:

Interoperating with Unmanaged Code[^]

"The greatest danger to humanity is humanity without an open mind."
- Ian Mariano

http://www.ian-space.com/

Problem with ServiceProcessInstaller and multiple service instances

User 2237029-Oct-02 23:57

User 22370

29-Oct-02 23:57

I have a .NET service that creates multiple instances of the service from the same executable. According to the documentation I only require a single ServiceProcessInstaller class and a ServiceInstaller class for each instance of the server. This is true also for services that contain more than one service.

The problem I have is with using a user account to run the service. Setting the ServiceProcessInstaller.Account property to the user value and entering a password and login always yields an error during the installation process saying that the account/password combination is invalid.

Now the peculiar part - this only happens on NT4 boxes, Win2K and XP do not exhibit this problem. The number of instances of the service is controlled by a configuration file, setting the number of instances to 1 also causes the problem to go away.

I can find little or no information about this on either newsgroups or MS support pages. Can anyone else confirm this is actually more than a local problem that we have? Better still, does anyone know a solution to the problem?

Thanks,

Jason.

modified 10-Jul-19 21:02pm.

config file not found :-(

Anonymous28-Oct-02 22:36

Anonymous

28-Oct-02 22:36

Hi all,

I have a windows application that uses remoting and is hosted in IIS. Its name is test.exe and the client config is called test.exe.config. They are both in the same virtual dir.

If I start it locally, the statement RemotingConfiguration.Configure("plato.exe.config"); executes fine and everything works.

However, if I start the application from its URL, i get a file not found exception: the config file could not be found.

The idea is: I start the application with its URL, the application should read the client config file that's on the server to get the remoting configuration out of it (instead of hardcoding it in the exe).

I searched but cannot find a solution for this. Anyone? Eek! | :eek:

Re: config file not found :-(

Stephane Rodriguez.28-Oct-02 22:43

Stephane Rodriguez.

28-Oct-02 22:43

In a browser-based scenario, the HTML file must use the <link> element to explicitly point to the configuration file.

How low can you go ?
(MS rant)

Re: config file not found :-(

Anonymous29-Oct-02 1:39

Anonymous

29-Oct-02 1:39

Thanks for the quick response. Could you give some details of how I should do that?

The html file looks simple:

Start Plato

In Plato.exe, there's a line with:

RemotingConfiguration.Configure("plato.exe.config");

and here it fails because config file is not found.

Thanks!

Re: config file not found :-(

Stephane Rodriguez.29-Oct-02 1:51

Stephane Rodriguez.

29-Oct-02 1:51

ref[^]

How low can you go ?
(MS rant)

Re: config file not found :-(

Heath Stewart6-Nov-02 6:22

Heath Stewart

6-Nov-02 6:22

First, your "rel" attribute needs to have a value of "configuration", not just "config". Also, the default machine.config configurations don't allow any access to the "bin" subdirectory. Your application and it's associated .config file should be in a publicly-accessible directory.

Also, when you're dealing with Web-deployed apps such as we are (very, very big), make sure you run "gacutil /cdl" to clear the TAC (note: not GAC) from time to time, especially if you're not using automatically versioning in the AssemblyVersion attribute (we're not because of configuration headaches).

"Well, I wouldn't say I've been missing it, Bob." - Peter Gibbons

But... i don't need a html file

Anonymous29-Oct-02 1:51

Anonymous

29-Oct-02 1:51

I just type in the URL to the executable, for example: http://dev/plato/bin/plato.exe, so I don't really need a html file...

So the problem remains: how can I make the following line:

RemotingConfiguration.Configure("plato.exe.config");

not throw a 'file not found' exception when i start the application via its URL?

About SDK1.1

Gale_Sea28-Oct-02 3:10

Gale_Sea

28-Oct-02 3:10

How can i install the .net Framework SDK 1.1 successfully after i having installed the visual studio.net ? everytime i try to setup the SDK,it was interrupted with Message "Before you can install Tools or Samples,Microsoft.NET Framework1.1 must be installed...".What's the problem,can you help me?Thanks

Re: About SDK1.1

James T. Johnson28-Oct-02 3:14

James T. Johnson

28-Oct-02 3:14

The message is a bit confusing if you don't have the page still open for the SDK... In order to install the SDK for .NET 1.1 you need to first install the runtime for 1.1.

I don't have the links handy at the moment but you should be able to get the runtime from the same place you got the SDK link.

James
Sig code stolen from David Wulff

Re: About SDK1.1

Gale_Sea28-Oct-02 3:41

Gale_Sea

28-Oct-02 3:41

I got the SDK from MS site,but i can't find the RunTime you said,and my .net Framework is version 1.0.

Re: About SDK1.1

James T. Johnson28-Oct-02 4:13

James T. Johnson

28-Oct-02 4:13

.NET Framework 1.1 Runtime:
http://www.microsoft.com/downloads/release.asp?ReleaseID=43361[^]

and for those who are interested

.NET Framework 1.1 SDK:
http://www.microsoft.com/downloads/release.asp?ReleaseID=43360[^]

And just to clear up a question you (or someone who has seen this thread) will probably ask next, in order to use VS.NET to develop for .NET framework 1.1 you need to be using the beta of VS.NET 2003 - "Everett" (only available to select people at the moment). The current release only supports .NET 1.0.

James
Sig code stolen from David Wulff

Help me!!!

Anonymous28-Oct-02 3:06

Anonymous

28-Oct-02 3:06

Thread.Suspend causes 100% cpu usage?

Jon Rista27-Oct-02 17:56

Jon Rista

27-Oct-02 17:56

I have a custom listview control that spawns a worker thread. This thread periodically updates the information in the list, in particular a time column. There are times when this control is not in view, or is completely disabled. When I call Thread.Suspend() on this worker thread, my cpu utilization topps out at 100% and stays there. I can't figure out why this is happening, and I'd like to avoid aborting the thread and restarting it every time the GUI hides this listview.

Has anyone encountered such a problem before, or does anyone know why calling Suspend on a thread causes cpu usage to go up to 100%? Thanks.

VS.Net Collection Editor

zorifila27-Oct-02 2:44

zorifila

27-Oct-02 2:44

Hi,

I wrote a Collection Class(viz: MYCollection)
(Derived from Collection Base).
And have added methods for Add() and Remove().
I have used this Class in a Custom Control,
and exposed a Property of type MyCollection.

Now, the VS.Net IDE does show the Collection Editor
Dialog Box for the Property,but when I add items to the
collection using the Collection Editor, the changes
are not persisted. (ie: The IDE does not Generate code
for the Items added to the collection).

What is to be done to persist the Items Added using
the Collection Editor (ie: to make the VS.Net generate code for the Added Items, just like it does for ListView
Items Collection, for Example)

Someone please help me....

Thanks

Re: VS.Net Collection Editor

leppie27-Oct-02 3:11

leppie

27-Oct-02 3:11

If you look at the CollectionEditor class you will see you only need to implement the indexer (this[index]) in your derived class for this to work.

Cheers Smile | :)

"There are no stupid question's, just stupid people."

using own libraries concerning proxy...

brotkopp26-Oct-02 4:40

brotkopp

26-Oct-02 4:40

Hi there,

here is my problem: i need a certain class to be used in a webmethod an a client. In order to do so i made a little library called ChatLib containing the class ChatMsg. Both, webservice and client, have the line "using Chatlib;", but the proxy (which is generated by the Visual Studio) seems to do something different.

The Compiler tells me that he is not able to convert 'chatclient02.localhost.ChatMsg' to 'ChatLib.ChatMsg' (referring to a line in the windows form, where i want to start the webmethod).
(in german: "Implizite Konvertierung des Typs 'chatclient02.localhost.ChatMsg' zu 'ChatLib.ChatMsg' nicht möglich.")

exchanging the line "using Chatlib;" by "using chatclient02.localhost;" in the client makes the compiler happy but the program does not run properly which means that there are system exceptions thrown.

i would be grateful for every answer especially those, that support the usage of Visual Studio.NET

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.