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I have a main form that uses AddOwnedForm to allow these forms to draw on top of the main form.
The problem I am having is with a control that I created by inheriting from System.Windows.Forms.Control.
When I display this control, which belongs to the main form, it will draw properly until it tries to write on top of an area occupied by an owned form.
Is there a way to allow a control to draw on top of anything.
I tried using SetTopLevel but that seems to turn it into a form and puts a forms border around it.
I have seen the build in ComboBox control pop up its listbox over anything so I figure it must be possible.
Does anyone have any ideas?
Thanks,
Jay
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Try overridding the CreateParams property and doing something like so:
protected virtual System.Windows.Forms.CreateParams CreateParams
{
get
{
CreateParams parms = base.CreateParams;
parms.Style |= WS_POPUP;
return parms;
}
}I'm not totally positive this will work, but it's worth a try.
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Unfortunately that did not work the way I needed. When you modify a control to have the WS_POPUP style it no longer acts as a child on the form and processing of other controls does not work.
Thanks for the suggestion.
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I'm using NetworkStream to read from a TCPClient.
I'm testing DataAvailable before reading to keep by thread from blocking on read.
The docs say that if the remote end has closed the connection, a call to DataAvailable should throw a SocketException, which I canb catch.
Unfortunatly, the exception isn't getting thrown, so my code keeps spinning on DataAvailable forever, never knowing that the connection has been closed. There don't seem to be any other properties or methods in either TCPClient or NetworkStream that I can use to get the connection state without potentially blocking.
Am I missing something? Is there another way to determine if the connection is active without risking a block?
Thanks.
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Most of the TCP code I've done runs in its own thread, so I never worry about blocking. That said, I'll take a few shots at it  .
Have you considered the asynchronous version of Read (BeginRead)? It's an asynchronous call, so it's non-blocking.
I once did a simple test application (non-robust) and wanted a Read to timeout after a certain amount of time (this isn't exactly what you want, but keep reading). In order to do this, I needed to get at the Socket itself (TCPClient.Client). Since this property is protected, I ended up having to create my own class (TCPTimeoutClient or some such). Once you get to the actual Socket, you can do all sorts of extra things (take a look at Socket.Available and Socket.Select for instance). I'm not sure if these Socket versions would behave differently, but it might be worth a shot?
I hope some of my babbling might help a little.
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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Hi C#-people,
I have a ListView, that contains directories and files.
I was wondering how I can popup the context menu (which contains items such as 'open with', 'add to zip', 'Copy', 'Paste', etc...) if I right click on these files/directories.
Can anyone point me in the right direction?
Thanks!
Kind regards
Ludwig
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This is really not as easy as you might hope and - to do so in C# - will require recreating countless interfaces, enum, structs, and consts already defined in various headers for Win32 shell programming.
See my answer to a somewhat similar problem to an early question today: http://www.codeproject.com/script/comments/forums.asp?msg=669971&forumid=1649#xx669971xx[^]
While this isn't exactly what you're looking for, you're now going to have to play the part of the Windows shell and pass an ITEMIDLIST - which is going to be hard enough in an application that knows little about the actual shell - to a default context menu while accessing the registry to query for other context menu handlers for the associated file type. I give several links in that previous post. You should read the documentation at the targets of those links about shell programming. There's a lot involved so you might consider just handling generic operations like copy, cut, and paste (if they represent real files, you can simply use the DragDropFormats.Files clipboard format and put a string[] array of filenames into the DataObject for the drag-n-drop or clipboard operation like cut and copy (using the appropriate DragDropEffects). That clipboard format is one the shell recognizes and will cut or copy the files appropriately.
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Hi all.
I need to get internet expl. selected text to process in my C# application.
Any clear help will be appreciated.
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Get the IHTMLDocument2 interface from the WebBrowser control (include the Microsoft.mshtml assembly in your project and get it from the WebBrowser.Document property, which may be null), then get the selection property (which may be null). This gets an IHTMLSelectionObject from which you can use the type property to determine the selection type (text, insertion point, control, etc.) and the createRange method to create a suitable object to work with the actual selection (like a TextRange). See the documentation for IHTMLSelectionObject in the MSDN Library for more detailed information).
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Ughhh ugly and messy COM interfaces. Can't wait for Whidbey's managed web browser control.
The graveyards are filled with indispensible men.
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I haven't had a time to look at it (or eat, or drink, or breathe) lately. Is the WebBrowser control completely managed (inside and out), or is it just a nicer CCW for the existing WebBrowser COM control (wrapping mshtml and providing IHLink and all that jazz)?
I know our app would definitely benefit from that, especially when the Microsoft.mshtml.dll assembly is almost 8 MB! 
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I didnt understand what you tried to tell.
What web browser? Do i have to create mine in order to get the selected text?
Say there is an instance of ie open , after that my app is run , and typing a hotkey I see the selected text. I want this.
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"IE" as you call it is nothing more than an application that hosts the WebBrowser control (which hosts MSHTML). Read the documentation for the Internet Explorer SDK. Read information specifically about IHTMLDocument2 and its selection property. If you don't understand how to get the IHTMLDocument2 object, there are plenty of articles here on CP about it. Just search for "WebBrowser" or "IHTMLDocument2".
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Hi,
I create in the folder DEBUG or RELEASE some settings files for my executable.
When I compile my project, the compiler delete the settings files and recreate a new folder DEBUG or RELEASE with the compiled files
So how can I do for disable this option.
Best Regards
youssef
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What do you mean by "settings file"? Do you mean the .config file? If this is the case, remove the app.config file from your project, which is a specially named file that's name is changed and it is copied to the output directory. Usually this is desired behavior so that you can source-manage the configuration file.
Otherwise, you may have a pre- or post-build configuration (only in VS.NET 2003 and up for C# and VB.NET) that is deleting these files because the project compilers only replace files in the output directories that it actually creates.
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Hello.
I'm using an ActiveX Control in my .NET project and I have to use a method that originally accepted a IStream.
The .NET type library importer has modified the parameter of this method and now looks like this Interop::MyActiveXControl::IStream.
The problem that I have is that I can't create directly a Interop::MyActiveXControl::IStream because this is an interface.
I have created a System::IO::MemoryStream and fill it with data but this type can't be converted ( or I don't know how ) to convert to Interop::MyActiveXControl::IStream.
Any ideas ??
Thanks in advance.
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Create a new class and implement that interface. There won't be a class generated for it because the parameter is an interface, unless your COM library exposed a class that already implements it elsewhere.
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I wrote an application a while back that used WIN32 C++ to query a list box in another application for its contents (using SendMessage).
I would like to do the same in C#, but instead of using SendMessage, I would like to associate the HWND with a ListBox instance.
I can get the HWND for the listbox that is in another app, and I tried using Control.FromHandle, but it returns null. If, however, I put a listbox in my own application it works. This made me suspect that it is a security issue and just not possible.
Thanks for any help.
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An HWND is not global but specific for an application's domain. (It's essentially a pointer). It is therefore not possible to use an HWND outside of that application.
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i want to retrieve the group-membership of all ad-users.
the performance with the directorysearcher-class seems to be very poor.
what do you think is the the fastest way?
thanks for your hints!
reagrds, thilo.
CODE:
Dim adEntry As New DirectoryEntry("LDAP://lan", "xxx", "yyy", AuthenticationTypes.Secure)
Dim adSearcher As New DirectorySearcher(adEntry)
Dim adSearchResult As SearchResult
Dim AllResults As SearchResultCollection
adSearcher.Filter = "(objectCategory=user)"
adSearcher.SearchScope = SearchScope.Subtree
adSearcher.SizeLimit = 65535
adSearcher.PageSize = 65535
adSearcher.PropertiesToLoad.Add("cn")
adSearcher.PropertiesToLoad.Add("sAMAccountName")
adSearcher.PropertiesToLoad.Add("memberOf")
Dim intCount As Int32 = 0
Dim strSoft As String
Dim strUser As String
Dim ArrSoftware As New ArrayList
' alle gefundenen ad-user...
AllResults = adSearcher.FindAll()
For Each adSearchResult In AllResults
' wenn die user-id ok ist...
If Not IsNothing(adSearchResult.Properties("sAMAccountName")) Then
strUser = Convert.ToString(adSearchResult.Properties("sAMAccountName")(0)).Trim.ToLower
Debug.WriteLine(strUser)
Try
' wenn der user mitglied von gruppen ist...
If adSearchResult.Properties("memberOf").Count Then
ArrSoftware.Clear()
' jede gruppe in der der user mitglied ist...
For Each strSoft In adSearchResult.Properties("memberOf")
ArrSoftware.Add(strSoft)
End If
Next
' datensätze in datenbank
If ArrSoftware.Count > 0 Then ApplInsert(strUser, ArrSoftware)
End If
Catch
' nix zu tun
End Try
End If
Next
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Unfortunatley, you don't have a lot of choices if you want to use pure .NET code. If this is a major problem, you could try doing this in a thread or a worker thread (see the ThreadPool class), being sure to use Invoke for ApplInsert if it modifies a UI (since controls are created on the main UI thread and should only be modified on that thread). You could also create a delegate for the ApplInsert method and use BeginInvoke (won't necessarily show-up via IntelliSense, but the compiler creates them automatically, at least the C# compiler does, which brings me to my next statement...)
Also, this VB.NET code and you posted it in the C# forum. Fortunately, .NET allows coders to use different languages that use the base class library (BCL) - as well as other assemblies - to produce the (almost) the same IL that is language-independant. I must warn you, though, posting VB.NET in the C# forum might get you beat up! 
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ok. thanks.
sorry for that vb.net-stuff!
regards, thilo.
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Hi, All.
Please, help. I need to create a COM Object for remote data accessing. It will connect to SQL server.
Is there any samples or articles?
I need just a little sample code to catch the idea...
Vital
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Are you referring to create a .NET assembly (DLL) written in C# that contains interop code to create a CCW for COM clients to use?
First, worry about writing the class to access SQL Server. That's trivial and you can find articles all over CP and the rest of the 'net on this, or look at the System.Data.SqlClient namespace classes, structs, enums, and interfaces. There's a ton of documentation and examples in there.
To create the CCW, take a look at Nick Parker's article here: http://www.codeproject.com/dotnet/nettocom.asp[^]. Use regasm.exe to register the DLL, then COM clients can access it. If you create your class interfaces with the attribute InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch) (or with ComInterfaceType.InterfaceIsDual), then automation clients like VB and VBA (and all your scripting languages) can access the COM object.
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