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It uses decoders, encoders, mixers, and variuos DMOs install on the system. You'll still need an encoder, but you can get those from various places and some programs will install one as well.
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Ok, thanks for your help.
Is this DirectSound specifics or do I look other places in the DirectX 9.0 SDK?
Since I am a beginner with all this, would you give me a URL into MSDN or something so that I know where to start?
Sorry if all these are newbe questions 
Øyvind
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You can find all the information about DirectX (and links to more information) at http://msdn.microsoft.com/directx[^]. And, yes, I do believe this is a function of the DirectSound APIs, but I'm not exactly sure since I haven't worked much with DirectX. The SDK installs many samples in C++, C#, and VB.NET.
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In an application that I am working on, I have a custom Configuration Section that returns a collection of plug-ins that are held in the .config file. It works fine the first time you try to load the plug-ins. But if you unload the collection, and then try to re-run the procedure to get the list from the configuration file, it returns the collection from cache instead of refreshing the list. Consequently, the collection that is in cache contains a list of plug-ins that are all disposed. Is there anyway around this? Thanks for all your help.
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If you mean like ASP.NET, then you'll actually need an application host to host your AppDomain in which your executable runs. Once an AppDomain is created and your application is executed in it, you can't change the config settings. ASP.NET uses its ISAPI filter to host the CLR. When the ASP.NET application detects changes to the config file, the AppDomain is unloaded and the host recreates it.
Also, if you're doing plug-ins, all you can specify is assemblies or types. Obviously, you cannot specify an instance (though serialized data could help create an instance). In either case - even if the plug-in was originally disposed - you need only re-instantiate the Type to create a new instance of your plug-in. Basically, don't store the objects in a collection - store the types and have a method that creates an instance from that type.
For example, I wrote a custom configuration section that stores such types (like is common in many of .NET's configuration sections) and creates an instance of class that contains not only that collection of types but a static method that creates an object based on a friendly type name that I pass in (searching the collection for that name, creating the type, and returning the object to me). Basically, my section handler and configuration object act like the Windows registry when it comes to COM objects.
One other option is to have a class that is initialized from the configuration object created from your configuration section handler that also watches the config file for changes (you can easily get the path to the .config file from AppDomain.SetupInformation.ConfigurationFile) and then uses similar code as the section handler to re-read the values into the object. It's a cluge, but it might be better than having to create a CLR host for your application (which can be either native or managed, BTW).
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I am creating an app that closly resembles MS Windows Explorer. Thetrouble is, I have no idea how the thumbnail objects were created that represent image files. Also, what oblect are the thumbnails and filenames placed in?
Mr. Mike
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From what I have read somewhere...
With your image item you call some method like, GetThumbnail or CreateThumbNail and Windwos actually stores these thumbnails and when another program calls GetThumbnail or whatever it is, it checks to see if a thumbnail is already present for that image. If so it returns that one, if not it creates a new one.
I also read that there is no way of creating a new thumbnail once one is created, only way is to manually delete the thumbnail image from the disk. Because Windows may create a thumbnail for displaying in Explorer and then its too small for what you want so it stretches it in your app and it looks horrible.
I have only read all this along time ago, never worked with any of it though. Thought this might be of some help to get you started.
Look in the .Net class library for the System.Drawing.Imaging.Image class and see if a Get or Create Thumbnail method is some where there.
Hope that helps.
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It's stored in a system image list, and there is a way to purge the list itself.
Also, the method to which you're referring is System.Drawing.Image.GetThumbnailImage.
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This really is an application-specific problem. Explorer's ListView (the common control 6 ListVew32) uses a system image list and many, many other things to query files type handlers for a certain interface (IThumbnailCapture) which returns an image that it stores in a cache (in this case, a hidden system file named thumbs.db).
For your application, you could do something similar, although using the default controls leave much to be desired (not everything from Windows' common controls is wrapped in the .NET equivalents).
Get thumbnails for your ListViewItems, add them to the ListView's LargeImageList property, and then set the appropriate ListViewItems' ImageIndex property to the index in which the thumbnail was inserted. In effect, these become the icons for the ListViewItems.
Unfortunately, if you want the thumbnail view that Explorer boasts, it won't be an easy task. First, you must make sure your application is bound to common controls 6 (in .NET 1.1, call Application.EnableVisualStyles before calling Application.Run in your program's entry point, Main), or use a manifest file (see my article list for an article that describes it). Then you'll have to P/Invoke lots of Win32 native functions and override a lot of functonality. Not fun. 
I hope at least I gave you some idea of what Explorer does for the functionality you want. Again, though, it's really up to you about how to do it since you control the code in your app.
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I have an application that connects to a database where the user has to log in to access the app. The login screen is the first screen the user encounters and requires the user to enter username/psswd info along with database info (i.e. database name, server name, etc...). I want to set it up so that when the app is run it will pull up the info entered by the user from the last time. What is the best way to approach this? I thought of XML serialization, but as I understand it, this is not a secure method and therefore passwd info should not be stored in passwd file. I already make a database connection in this form, so if I could I would like to store this data in the database, but I cannot make the connection string until the user enters that info. I suppose I could do the mix of the two, but how will that affect performance? Any one have thoughts.
Thanks in advance.
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Why don't you just write it to the registry using an Encryption algorithm?
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Using the registry is not recommended for .NET applications. Instead (to the original poster) you can still encrypt the password and save it to the .config file (named yourappname.exe.config) either in the <appSettings> or to your own section that you can create using an implementation of IConfigurationSectionHandler. Using .config files is far more robust for .NET apps because it centralizes application settings.
The idea would still be the same, though, and there's many ways to accomplish the task.
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Storing (and ESPECIALLY retrieving) a password is never secure. Why would you want to retrieve the password from a file? You should never have to retrieve a password, it should always be given to you by the user.
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I'm not a security expert, but there's one thing I've picked up...
In general, you should never store a password. I think it's a bad idea to even store an encrypted one. If you store an encrypted one and your keys are compromised, decrypting it is trivial.
Store the hash of a password and "salt" that hash. It's preferable to have your salt have something in it that varies per user. Assuming the user-list and password hash is compromised, salting prevents a hacker from gaining easy entry. Having your salt have something unique per user in it prevents comparing a known account with a known password and finding another account with that same password.
Then hash what they input and check it against the stored hash.
Do a search for hash's and salt for some more info.
I, for one, do not think the problem was that the band was down. I think that the problem may have been that there was a Stonehenge monument on the stage that was in danger of being crushed by a dwarf.
-David St. Hubbins
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I try to retrieve the bitmap displayed in a static control with a call to appropriate windows API.
I get a non zero bitmap handle, but the following code generate the exception reported.
imageHandle= SendMessage (handle,STM_GETIMAGE,IMAGE_BITMAP,0);
Bitmap bitmap = Bitmap.FromHbitmap(imageHandle);
System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.
What's the problem?
thanks.
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Why is your managed app getting a handle to an image using SendMessage? I assume the image is in a native control? Is it in another application apart from yours? If so, handles are not valid across application boundaries.
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Yes, im trying to get the icon of a label control (Static) belonging to
a dialog popped up by another app.
Window handle remains valid across application context, i'm able to
enumerate all the components contained in dialogs owned by other applications
and get all their properties, but every thing fails when i try to access images.
There's a way to have managed code to access other application contexts?
thanks.
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Roger J wrote:
since it is free i hope i wont get too flamed for this ..
As long as the code is free, its ok, you are under obligation to submit an article within the next 90 days. 
leppie::AllocCPArticle("Zee blog");
Seen on my Campus BBS: Linux is free...coz no-one wants to pay for it.
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Just an FYI:
You should take a look at that page with the Mozilla 1.5 browser. It gets really screwed up.
I, for one, do not think the problem was that the band was down. I think that the problem may have been that there was a Stonehenge monument on the stage that was in danger of being crushed by a dwarf.
-David St. Hubbins
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What is an easy way to change a return key to act like the tab key in a c# windows application for all controls on a windows form?
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You could handle the Control.KeyDown event and use SendKeys.Send to send a tab:
this.myForm.KeyPreview = true;
this.myForm.KeyDown += new KeyEventHandler(this.myForm_KeyDown);
private void myForm_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
e.Handled = true;
SendKeys.Send("{TAB}");
}
}There's other ways through P/Invoking PostMessage, but doing it this way should work and keeps all your code managed.
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Thank you for your reply.
I had tried this, but I tried it again (using the designer and adding the code to check: if(e.KeyCode == Keys.Enter) and what I found again was that this only seems to work if you place the _KeyDown check for each control rather than at the form level. Is there a way to trap the key stroke globally since setting the: [this.myForm.KeyPreview = true;this.myForm.KeyDown += new KeyEventHandler(this.myForm_KeyDown);] does not seem to do it?
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That's why I included myForm.KeyPreview = true in my example code.
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Thank you again for your response.
I tried as you suggested (the code you suggested is generated by the .NET studio by changing KeyPreview in the form properties to the "True" value) and the same result occured ... the return key was not trapped and the cursor did not advance to the next tab field. The following code was generated:
this.KeyPreview = true;
where "this" is the form.
When I changed the event handler for each field to access the function "GlAcctMaster_KeyDown", it worked fine. It generated the following code:
this.Text_Description.KeyDown += new System.Windows.Forms.KeyEventHandler(this.GlAcctMaster_KeyDown);
I much appreciate your responses.
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