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Without using a keyboard and mouse hook, this is not possible on XP nor any Windows platform. You should not do this, either. If you want to disable input messages to be handled, set Cursor.Current to Cursors.WaitCursor. This disables input processing for the entire application. This is all you should do, accordingly to Windows programming guidelines.
If your application modifies system state, be sure to tell the user that and that they should wait. Give them a progress bar if possible, and nice friendly wait message.
Also if possible, make your operation atomic. Depending on what you do, you could use transactions to make sure the batch of operations fails or completes as a whole. If your performing database routines, all major RDBMS's support atomic operations. You can futher use transactions in ADO.NET using IDbTransaction implementations like SqlTransaction and OleDbTransaction, etc.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Second, I did found a way to lock the keyboard and mouse on XP (and actually every platform) which is very much supported by microsoft.
Here is the link to the msdn help page:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/UserInput/KeyboardInput/KeyboardInputReference/KeyboardInputFunctions/BlockInput.asp[^]
(or you can just look for "BlockInput" function - BOOL BlockInput(BOOL fBlockIt); - this is the win32 version of the function, the win16 version is "lockInput").
Note that I am only using it as part of my company need to make some actions on the user computer without the user intervention, when using a 3rd party application which I have no other control of except using the SendKey function to the other application window. During this time I don't want the user to accidently do some damage. This is highly rare and we are trying to avoid this situation at all cost but ironicly, sometimes this is the best way to actually raise the service quality we give to the users (and yes, we display a progress bar and a message).
Thanks again,
Haim.
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I want to retirieve the password and name of the user who has currently logged in into the system. If possible also let me know how to retieve user details and password of the user who has currently logged into the Portal Server 2003. I am trying to integrate an application which login with the information user has provided to login in to the sharepoint serve.
Thanks in advance
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You can't retrieve the password, unless a network administrator has stupidly enabled plain-text passwords, and that's only for support very old legacy systems. If you could retrieve the password, what's stopping a cracker?
You can retrieve the username but how you do that depends on the context. In ASP.NET if user impersonation and Windows authentication is enabled, you can use the User property you'll find on the Page class and on other classes. This retrieves the IPrincipal, from which you can get an IIdentity that defines the Name property.
Using SharePoint, this would work because SharePoint defaults to NTLM authentication (IIRC, that's all it supports). You shouldn't have to re-authenticate the user, either, so long as the authentication request is to the same domain or forest in an Active Directory network (depending on the network setup).
If you use Kerberos authentication, this authentication should be transparent as well within the same network or forest, depending on the trust model implemented.
It's best you talk to your network administrator to figure out what's possible on your network.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Can i retrieve the login details from a sharepoint portal server?
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Same way I mentioned before. Read about the Page.User property. If you need help specific to SharePoint, I suggest you try a search for "SharePoint" on google[^]. There's many sites full of helpful information. Your problem is not specific to C#.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Thankyou, with ur help i am able to get the details of the user who has logged-in into the portal server. I have another problem. I have a webpart and depending on the user who has logged in, i need to display a webpage. I am unable to do it, any suggestion?
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When I initially started .Net Forms I was gladdened by the provision of the Dock property and used it everywhere in resizable forms. It saved all the layout functionality that used to have be written in the Resize event from VB. However there were occasions when I would have to Dock a Panel in the form with a padding and then dock other controls inside that to get the right look and feel.
So then you look a little closer at the .Net offerings and discover that you can avoid these extra controls by using Anchor instead.
My question is one of developer choice. Is there a preferred method out there that people are using to layout their UI's? Does anyone favour Anchor over Dock?
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I used to prefer anchoring controls (people with a Java background might prefer docking  ), but meanwhile mostly converted.
The reason was that with visual inheritance you'll get weird/incorrect results when you anchor a control to the right or lower border of the container and this container is resized in a derived form. That's why I try to use docking now wherever I can.
mav
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You should not base your usage of Dock vs. Anchor on preference, but requirements. Dock and Anchor do two different things, but they can seem similar when you anchor opposing sides. It's the ability to anchor adjecent sides that makes the two unique. If you want a Button to always stay in the lower-right corner, you anchor it to the bottom and right sides. You can't do that with docking. All you can do is dock to the bottom, but that will also work like anchoring it to the left side in addition. What you're left with doing is using a complex hierarchy of controls like the Panel or other container controls to support this. The extra window handles to track - not to mention the extra memory for these controls - is not required.
Also, some container controls allow you to set the padding for docked child controls, but this still doesn't afford you the same level of control for anchoring. You can anchor a control 8 pixels from the left edge of a parent control and 16 pixels from the top, and it will stay there (for example, depending on the anchored sides). With docking, that is much more difficult.
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Software Design Engineer
Developer Division Sustained Engineering
Microsoft
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Hi All,
i've a tricky little problem with AutoScroll functionality that i can't seem to overcome. I have a panel with its autoscroll property set to true. On the panel i have several combo boxes which are surrounded by some graphics implemented with GDI+. My problem is as follows .. say a combo box at the bottom of the panel has focus, when i click on the panel i want it to gain focus but not refresh and redraw itself at its initial position i.e. (0,0). In other words when the panel gets focus i still want to be able to view the combo box at the bottom of the panel which had previously been the active control.
Is there any way of preventing the panel from redrawing itself at its initial (0,0) position???
Or is it possible to calculate the autoscroll position prior to giving the panel focus then explicitly setting the autoscroll position to the desired position.
Any ideas and suggestions are very welcome and appreciated!
Thanks,
Paul Griffin
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Simple math and the ScrollableControl.AutoScrollPosition (inheritted by derivative classes like Panel). Just be sure to read the .NET Framework SDK documentation about when to use client- and screen-based coordinates (which can be easily converted using methods like Control.PointToClient and Control.PointToScreen).
If you have a ComboBox that is partly hidden and want to make sure that it's completely visible without scrolling it to the client point 0,0 for its container, find out how much is hidden and offset the current AutoScrollPosition by that amount:
int offset = comboBox1.Bottom - this.Height;
Point p = this.AutoScrollPosition;
p.X -= offset;
this.AutoScrollPosition = p; This is only an example, but hopefully gives you some idea. Also, do not simple set AutoScrollPosition.X to something. A Point is a value type - not a reference type - and needs to be copied first before being modified. If you set AutoScrollPosition.X to some offset, you'll notice no change because a copy was made but never assigned to AutoScrollPosition again.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Hi Heath,
thanks for your response! Your suggestion is actually the way i had approached the problem. In the MouseDown event handler for my panel i create a vertical offset from the MouseEventArgs e.Y. as follows:
int offset = e.Y ;<br />
this.myPanel.Focus();<br />
<br />
Point p = this.myPanel.AutoScrollPosition;<br />
p.Y = offset;<br />
this.myPanel.AutoScrollPosition = p;
When i debug the code i see that p does get initialised to the correct value but the assignment to AutoScrollPosition never works. AutoScrollPosition always remains (0,0)???
Any ideas as to what is happening here?? 
Thanks again!
Paul Griffin
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Your offset isn't an offset at all. You need to off-set the current Point (the AutoScrollPosition) by a certain amount like I did in my example. What you're doing now would make the Location of your control scroll to the top which would be 0,0 (the position within the container control).
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Hi Heath,
sorry if i seem to be missing the point! Perhaps i need to re-phrase what it is i'm trying to accomplish. I'm trying to get a panel with AutoScroll set to true to scroll to a certain location i.e. the location last clicked before i gave focus to the panel thus causing it to redraw at its initial position.
No in your example you use this.AutoScrollPosition = p;
i assume for me this would be mypanel.AutoScrollPosition = p;
but when i do this and debug it if i step over the assignment the AutoScrollPosition value = (0,0);
so i understand that i need to offset the AutoScrollPosition .. i just can't seem to get it to change from (0,0)
again i appreciate your help here! this is starting to drive me mad!
Paul Griffin
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It's what you do to the Point before assigning it back to mypanel.AutoScrollPosition that matters. If you haven't already, read about the ScrollableControl.AutoScrollPosition and pay close attention to the the note just before the example.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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Hi Heath,
just to let you know i finally cracked it, a combination of thinking about your posts properly and spotting a very stupid mistake i was making.
Thanks a lot for your replies!
Paul Griffin
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Reading that back still didn't sound right i'll try one more time.
The sequence of events are as follows:
1. My panel receives focus and using the mouse wheel or scroll bar itself i scroll to some point on the panel.
2. I click on a second control e.g. a combo box.
3. I'm now finished using the combo box and i would like the panel to regain focus so that i can continue scrolling it.
4. I click back onto the panel, the panel_MouseDown event handler fires in which i include the line panel.Focus();
Problem:
Each time this line is executed the panel redraws itself with the scrollbar at its initial position and i have to scroll all the way down to where i was before i can continue to the next control lower down on the panel.
May sound like a trivial problem but as i've said repeatedly the functionality to set the scroll bar position explicitly doesn't seem to be there!
There hope that describes the situation a bit more clearly! 
Paul Griffin
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Hi everybody,
I am developing a game for a pocket pc. There are picture boxes with images loaded @ runtime that forms a rectangle like shape.
How u play is , u have to create chains(draw line) combining images of same type (there are 4 types of images). To do this I need to find the shortest path between 2 images and the path should not be blocked by any other type of image.
A line also need to be drawn joining the images.
Can anyone please help me!!!!!!!!!!!!!!!!!!!!!
Thanks
Casper
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Hi,
I am developing a game for a pocket pc. There are picture boxes with images loaded @ runtime that forms a rectangle like shape.
How u play is , u have to create chains(draw line) combining images of same type (there are 4 types of images). To do this I need to find the shortest path between 2 images and the path should not be blocked by any other type of image.
A line also need to be drawn joining the images.
Can u please help me!!!!!!!!!!!!!!!!!!!!!
Thanks
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Have a look at C# : A-Star is born or at Quickgraph
Or look for "Dijkstra algorithm" on google.
Maybe post/send some code to explain the situation... curous as how it all looks myself.
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I had a previous post regarding how to design a socket based client-server system with C#.net which will scale very well. http://www.codeproject.com/script/comments/forums.asp?msg=913692&forumid=1649#xx913692xx[^]
Heath gave a very interesting response, which told me:
(1) Use Web Services or .net remoting to free yourself from the socket level details
(2) Try to use WSE DIME for file transfers
I am reading on these.
A further question in this context:
I have observed that many clients do not allow incoming http connections inside their firewall. They typically have the DMZ firewall configuration. The Web Server will be in the DMZ and app servers will be inside. They also do not permit to have their business logic sitting on the IIS machine.
So even though I have a Web service based entry to my system, it still has to do socket communication with my server sitting inside the firewall over an admin allowed port.
Browser/WinForm Clients
<->DMZ<-> [Allows only http]
Web Service (IIS)
<->Firewall<-> [Allows only my chosen port]
My Server (With DB/NTFS/Network access)
Am I missing something? Are there any better options?
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In the scenario you described, your solution is correct. But again don't consider simple socket communications. .NET Remoting can work over any port without IIS, you just need a different host. Windows Services, for example (those deriving from ServiceBase and installed with the ServiceInstaller and ServiceProcessInstaller classes), make great hosts.
The solution depends entirely on your network topology. If your external web servers sits in a DMZ and has limited access to the inside network through well-known ports (like HTTP), then one solution is to use .NET Remoting or Web Services to talk to an internal web server (perhaps a virtual end-point for SQL Server, even) through port 80 (or whatever port the web server is configured on).
There's not a single solution for any given scenario.
To learn more about .NET Remoting, I recommend picking up "Microsoft .NET Remoting" from Microsoft Press[^] or "Advanced .NET Remoting" from Ingo Rammer[^], both very good books (although the latter is for intermediate and advanced .NET Remoting developers, while the former is for beginning and intermediate .NET Remoting developers).
The only point I was making before was that the wire protocol isn't enough. You still need to define a data transfer protocol with any application and platform. .NET Remoting and Web Services (which are an industry standard and not specific to .NET) describe both. .NET Remoting is comrised of independant wire and transfer protocols (i.e., binary or SOAP over HTTP or TCP - "out of the box"), while Web Services use SOAP over HTTP.
If you want to use sockets, you'll need to define your own protocols.
This also depends on legacy systems, too. If you have a legacy socket server in place and want to continue using it, then you'll have to use the protocol you already defined with the socket classes in the BCL.
The nice thing about Web Services is, though, that many legacy servers now support HTTP daemons, which aren't too hard to implement (basically) anyway. Developing a Web Services need not be hard, either, so long as you explore the SOAP and WSDL specifications and implement them accordingly. I've seem scenarios where older AS/400s implemented Web Services. IBM was a key player in the push for Web Services, so many of their upgraded OS images support them through WebSphere or some other system (I must admit I don't follow IBM these days).
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles]
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I tried to do some C# for the first time and decided
to try and use one of my C++ COM classes from it.
Using the class from C# gives this definition of a method.
MyInterface1.A(out MyInterface2 ppIFace)
Trying to call it as this will fail with a syntax error.
MyInterface2 IFace2;
MyInterface1 IFace1;
IFace1.A(IFace2)
How do i call this method from C# ?
/Magnus
- I don't necessarily agree with everything I say
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With C# you'll have to specify if a parameter is a ref or out parameter not only at the method declaration but at every call.
So writing
IFace1.A(out IFace2); should do the trick.
Regards,
mav
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