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Most, if not all, firewall programs work by using an NDIS Hook to (in simplified terms) see all the packets fly through the network adapter. They get a chance to examine every packet that passes through and can optionally pass the packet to the network adapter (on the way out) or pass it on to Windows (on the way in). A firewall works by just dropping any packet it doesn't like the look of.
In answer to #3. If you want to close a port then all you need to do in your NDIS Hooked code is to block any packets on that port. As you examine every packet as is passed through, this means that you just don't pass the packed on the ports you want closed.
"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar
The Second EuroCPian Event will be in Brussels on the 4th of September
Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!
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Really i thought that using the hook would wind up degrading performance, and that a seperate socket layer was used. Interesting thanks 
Discovery consist of seeing what everybody has seen and thinking what nobody has thought -- Albert Szent-Györgyi
Name the greatest of all the inventors: accident --Mark Twain
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I've created a user control and added a designer for it so I can add some custom code that will setup the form to work with the control. Problem is, I have keep track of the number of these controls that have been created. Reason is that I need to display them in a certain order. So, let my control be called jControl... then I need to generate something like the following: jControlsCollection.Add(jControlk.layered ? jControlk.layer : k); This way, I can draw the jControls in the order that they are created in the designer if I want, or set some layer that they should appear on. I have the code to put the code into the forms document, but don't have a way to get k(the kth control that I just created in the designer).
Also, while debugging my designer, I've noticed that: public override object Serialize(IDesignerSerializationManager manager, object value); gets called just about any time some happens to the control... even when the control is deleted... so I need a way to tell what happend to the control(like when it was first constructed(maybe by using a constructor, not sure... I don't know much about what I'm doing... just what I want to do ;/). I can't seem to find much information on it, and the info that is doesn't go into much detail about what I want to do.
Anways, any help would be appreciated! Thanks, JS
P.S. How can I generate code for the controls only once. Basically, I would like to setup my form to use the controls(declare a jControlsCollection and add the controls to it). i.e. generate the code for only once and only if there is atleast one jControl on the form).
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The fact of the matter is that you can't control how the designer does things, only how it interacts with your code. In fact, in many of the more well-written topics in the .NET Framework SDK covering design-time functionality, this is basically stated.
Serialize is called on any container being designed (if applicable) when anything happens because the source code must be kept in-sync.
The fortunate thing is that controls are instantiated as they would be at runtime by the designer. If you want to keep track of information about a control (such as how many are created), then add a static field (probably a private static field) and increment that in your constructor. You can also decrement that in the finalizer (written in descructor notation as ~<classname()>) or implement IDisposable, which the designer should call when done with your object (you can never be gauranteed of when the finalizer is called by the GC).
Still, though, a collection (ICollection implementation, presumably) has a Count property. The kth element is Count - 1. Why can't you use that for whatever you're doing? And the order of the controls if the order in which they were added (unless you inserted a control before the end of the collection, of course).
Microsoft MVP, Visual C#
My Articles
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well, I tried to messa round with that stuff and doesn't seem to work(For me atleast, I just started recoding after a couple of years and I'm not up to par at the moment). I've tried that static method and problem is, constructor is called even when deleted the control. I've tried the IDisposable, but not sure how it works(seems to not be called all the time or sometimes to many times(used code reference from .NET sdk). The only thing that seems to be consistant is that the serializer gets called each time and for all controls when one is added or deleted to the form design(so, when I add the 4th control, it will call serializer 4 times). I got all this through debugging.
Heres what I need to do(create designer to generate):
// Is created only when one or more jControl's exist
// Is deleted when there are no jControl's
jControlsCollection jControls = new jControlsCollection();
//
// jControlk
//
// The next lines are generated by the base serializer
this.jControlk = new ns_jControl.jControl();
this.jControlk.Location = new System.Drawing.Point(56, 32);
this.jControlk.Name = "jControl1";
this.jControlk.Size = new System.Drawing.Size(112, 96);
this.jControlk.TabIndex = 0;
// I want to add this line
// the problem being, how do I figure how what k is in my code generator
// Only way I can think of is by extracting it from one of the previous code statements
// But that seems like a hack to me, and theres gotta be a better way...
this.jControls.Add(this.jControlk)
P.S. I know it can be done because the default code generator does it. It adds "this.SuspendLayout();" only once.
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this.SuspendLayout is for the Form or UserControl itself (hence, this). But your code is added only once, too. Just because Serialize is called more than once at design-time doesn't mean your serialized code is repeated over and over again - just look at the source. As I said before, this is how the designer keeps in sync with the source code. How else could it be done?
I gave you a link to an article that gives a good example. You can also use DesignerSerializationVisibilityAttribute with DesignerSerializationVisibility.Content as the argument on the property which has hte collection of jControlk*. This tells the designer to serialize the contents of the collection to your source file, but it seems to work only for reference types (not value types, like structs, enums, and the primitives). If you need to do more advanced customization, then you need to implement a designer serializer. Again, there are many articles here on CodeProject, including the one I linked you before. You really should read these, as well as the class documentation for related classes.
Finally, you really should take a look at Naming Guidelines[^] in the .NET Framework SDK. If you plan on releasing this as a library, following these guidelines keeps your types consistently named with every other type, which is important for Rapid Application Development (RAD) and helps the developers using your product (and a pleased client is a paying client). Consistent naming is not required, but is highly recommended.
Microsoft MVP, Visual C#
My Articles
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Hi all,
I'm currently trying to use the SetupDiGetDeviceInterfaceDetail function of the Setupapi.dll.
But unfortunately I can't get it working.
Here's my definition of the function:
[StructLayout(LayoutKind.Sequential, Pack=1)]
public class SP_DEVICE_INTERFACE_DETAIL_DATA
{
public int cbSize;
public short DevicePath;
}
[DllImport("Setupapi.dll", SetLastError = true)]
public static extern Boolean
SetupDiGetDeviceInterfaceDetail(
IntPtr DeviceInfoSet,
ref SP_DEVICE_INTERFACE_DETAIL_DATA DeviceInterfaceData,
IntPtr DeviceInterfaceDetailData,
int DeviceInterfaceDetailDataSize,
out int RequiredSize,
IntPtr DeviceInfoData);
Here's the piece of code where I call the function:
public void WDMEnumeration()
{
StringBuilder DeviceName = new StringBuilder();
Guid guid = MEDIA_GUID;
IntPtr NewDeviceInfoSet;
Win32APIfunctions.SP_DEVINFO_DATA DeviceInfoData= new Win32APIfunctions.SP_DEVINFO_DATA();
NewDeviceInfoSet=Win32APIfunctions.SetupDiGetClassDevsA(ref guid, 0, IntPtr.Zero, DIGCF_PRESENT);
if( NewDeviceInfoSet.ToInt32() == -1 )
{
throw new System.ApplicationException("device information is unavailable!");
}
for(uint uiDeviceIndex=0; uiDeviceIndex<MAXCARDS; uiDeviceIndex++)
{
DeviceInfoData.cbSize = 28;
DeviceInfoData.DevInst=0;
DeviceInfoData.ClassGuid=System.Guid.Empty;
DeviceInfoData.Reserved=0;
bool bResult = Win32APIfunctions.SetupDiEnumDeviceInfo(NewDeviceInfoSet, uiDeviceIndex, DeviceInfoData);
if(bResult == false)
{
Win32APIfunctions.SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
throw new System.ApplicationException("no such device!");
}
DeviceName.Capacity=MAX_DEV_LEN;
bResult = Win32APIfunctions.SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet, DeviceInfoData, SPDRP_FRIENDLYNAME, 0,DeviceName, MAX_DEV_LEN, IntPtr.Zero);
if(bResult == false)
{
bResult = Win32APIfunctions.SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet ,DeviceInfoData, SPDRP_DEVICEDESC, 0, DeviceName, MAX_DEV_LEN, IntPtr.Zero);
if(bResult == false)
{
Win32APIfunctions.SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);
throw new System.ApplicationException("incorrect device name!");
}
}
int dummy = DeviceName.ToString().IndexOf("Cinergy");
if(dummy != -1)
{
Win32APIfunctions.SP_DEVICE_INTERFACE_DETAIL_DATA dummyData = new Win32APIfunctions.SP_DEVICE_INTERFACE_DETAIL_DATA();
dummyData.cbSize = Marshal.SizeOf(dummyData);
int iRequiredSize=0;
Win32APIfunctions.SetupDiGetDeviceInterfaceDetail(NewDeviceInfoSet, ref dummyData, IntPtr.Zero, iRequiredSize, out iRequiredSize, IntPtr.Zero);
int iLastError = Marshal.GetLastWin32Error();
}
}
}
iLastError is always 87, which means ERROR_INVALID_PARAMETER.
But what am I doing wrong?
Best Regards
Bernd
Edit: Is there a way to format the source code in these forums? [code][/code] doesn't seem to work.
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Pain_Elemental wrote:
Is there a way to format the source code in these forums? [code][/code] doesn't seem to work.
Use <code></code> for inline code and <pre></pre> for block code (which is actually what you should use in your case).
First of all, I noticed a lot of problems with your marshaling and your declarations. A DWORD is actually a uint, but an int will work (though you should use MarshalAsAttribute to make sure it's marshaled correctly), and the second field of SP_DEVICE_INTERFACE_DETAIL_DATA is a TCHAR[], which is actually a string using the right encoding. Whenever you see that T in a char array type in Win32 APIs, it means that the string is ANSI on Windows and Unicode on Windows NT (depend on the #defines, of course; but Windows doesn't natively support Unicode). The correct declaration of the two structs and the function are as follows:
[StructLayout(LayoutKind.Sequential)]
private struct SpDeviceInterfaceData
{
public uint cbSize;
public Guid InterfaceClassGuid;
public uint Flags;
public IntPtr Reserved;
public SpDeviceInterfaceData(uint cbSize, Guid InterfaceClassGuid,
uint Flags)
{
this.cbSize = cbSize;
this.InterfaceClassGuid = InterfaceClassGuid;
this.Flags = Flags;
this.Reserved = IntPtr.Zero;
}
}
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
private struct SpDeviceInterfaceDetailData
{
public uint cbSize;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=1)]
public string DevicePath;
}
[StructLayout(LayoutKind.Sequential)]
private struct SpDevInfoData
{
public uint cbSize;
public Guid ClassGuid;
public uint DevInst;
public IntPtr Reserved;
}
[DllImport("setupapi.dll")]
private static extern bool SetupDiGetDeviceInterfaceDetail(
IntPtr DeviceInfoSet,
ref SpDeviceInterfaceData DeviceInterfaceData,
out SpDeviceInterfaceDetailData DeviceInterfaceDetailData,
uint DeviceInterfaceDetailDataSize,
out uint RequiredSize,
out SpDevInfoData DeviceInfoData);From here you should be able to make the right calls. The problem with not marshaling data correctly is that things get in the wrong place. Lets say you just assume that a string field is Unicode string (how strings are stored in .NET, actually) but it's actually an ANSI field because it's running on Windows. Only half the string will be read (depending on the API implementation, a single character might only be read since the second byte may be interpreted as NULL). Or many people make the mistake of thinking that an unmanaged LONG is a long in C# (an Int64). A LONG is only 32 bits. This pushes the stack and extra 4 bytes, and it's that stack that provides the data for which a function executes.
That is most likely the reason for that error your getting. The wrong data was being sent (as far as the function call was concerned) so it returns a "wrong params" error.
Microsoft MVP, Visual C#
My Articles
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Thanks!
I just copied my definition of the structs and function from an other message board, because I am not familiar with this PInvoke stuff.
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Hi Guys
Anyone knows the event , when we click on the row header for selecting a row ? also which is the event when we drag a row for resizing it ?
Pls help , its urgent
bye
krishnadevan.
If u can Dream.. U can DO it
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hi
how i access to controls of a project in another project in a solution with two projects?
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You have to add a reference to your project, which can be found under the "Projects" tabpage in the "Add Reference" dialog.
www.troschuetz.de
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thanks
but i want access to controls of second project in stratup project .startup project dont make dll file and cant add it to second project reference.
please help more.
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I don't exactly get what you want to do 
Which output types do your projects have?
In which project are the controls defined and where do you want to use them?
If they are defined in the second project and should be used in the startup-project, your startup-project must have a reference to the second project. In this case it's not important which output type it has.
www.troschuetz.de
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hi
controls defiend in Startup project and i want assign them by second project thus i want access controls startup projects controls in second project.
thanks
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Think I got it this time.
As you cannot reference your startup project which defines the controls you could either
move the controls to your second project and reference this in your startup project, so you can still use the controls there or
create a third project which contains the controls and is referenced by your two existing projects.
www.troschuetz.de
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Hi all
I'm a newbie to C# and trialing the mail checker 1.0. What I would like to do is extend the source code so that when I receive a new mail notifier for 1 new message, I can click text in that box and be taken to that email in my default email client. Is this difficuilt to do? Does anyone have sample code I could refer to for ideas?
Your help is greatly appreciated.
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We can't tell you if it's difficult to do, because that functionality is specific to the product (unless someone else looking at this has actually used it). If you have questions about a specific product, you need to ask the company (developer forums, newsgroups, whatever the company might have). This forum is for questions relating to C# and the .NET Framework, not for specific products (that's what a company's support sections/teams are for).
Microsoft MVP, Visual C#
My Articles
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Hi all,
I have a tricky situation, with which I would very much appreciate a little advice:
I have a C# Control for embedding a flash swf in a page.
The 'codebase' and 'pluginspage' attributes of the object tag require urls
(e.g. http://www.macromedia.com/go/getflashplayer)
If the page is being served over https, of course that url should change to:
https://www.macromedia.com/go/getflashplayer
...to prevent the browser alerting you about mixing secure and non-secure objects.
Now here's the problem:
Our hosting environment has a linux server as the only outward-facing IP, and we are using the apache proxy pass module to serve our .net sites from a windows machine.
So the linux box serves on http or https. The windows box is only http.
My C# control, sitting on the windows box needs to know which to embed the flash as.
I hoped I could use the IsSecureConnection property of the request object, but that only sees the request from the linux box, which is http.
The full path of the url is no help either - same thing.
I hope I have explained this sufficiently well. If anyone has any ideas I would love to hear them.
Many thanks
Steven
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Any future questions about ASP.NET (in any language) should actually be posted in the ASP.NET[^] forum.
ASP.NET will only know what it is asked. If the linux box is asking requesting a resource over HTTP, that's all it will know. You need some way to tell the Windows box which is being requested. I recommend taking a look at the apache mod APIs for that caching proxy mod you're using to see if there's any exported APIs, otherwise there's really no way to tell.
One more idea is to actually have to separate URLs (they could map the same directory/file, though) so that the ASP.NET page (or whatever) can easily distinguish between the two requests. You can't use IIS's virtual directory functionality because this will actually create a separate web application with a different AppDomains. Instead, you could either use two separate pages or use a custom IHttpHandler implementation which is pretty easy. Read a recent article in MSDN, Serving Dynamic Content with HTTP Handlers[^], for a good example and discussion.
Microsoft MVP, Visual C#
My Articles
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Hi Heath,
Thank you so much for replying so fully, and I'm sorry I haven't got back to you till now.
Point taken about which forum this should be on.
The separate URL idea could be a winner, also I noticed the REMOTE_PORT header variable is different in both cases so may be able to do something there.
I read the articles on HTTP Handlers, thank you - very interesting.
In fact though, I thought of a rather lazy, well - frankly low down and dirty way of getting around this:
I can just have the codebase url as https the whole time! It seems to work perfectly well and is certainly a lot more straight forward. Do you think this is sufficient?
Thank you again for getting back to me
Best Wishes
Steven
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It would work, but you're putting an extra burden on the client and server to encrypt communications to send the control(s). It may be negligible, however, so it really is up to your implementation.
Microsoft MVP, Visual C#
My Articles
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Hi
I have a problem which I think is basically due to my lack of understanding as to the order that events are processed.
I have an .aspx page to which I want to programtically add all its controls (so that I can change the look of the application by simply modifying a couple of classes). I've based this on Peter Provost's article "ASP.Net Templates - Using Inheritance" (http://www.codeproject.com/aspnet/page_templates.asp).
The code almost works except that not all of my controls get added to my form as intended - the earlier-added ones do, the later-added ones do not. This is the kind of rendered HTML I get:
<div><label for="txt4">4</label><input name="txt4" id="txt4" type="text" /></div>
<div><label for="txt5">5</label><input name="txt5" id="txt5" type="text" /></div>
<form name="frmApp" method="post" action="company.aspx" id="frmApp">
<input type="hidden" name="__VIEWSTATE" value="dDw1MzgxOzs+kxSQNMEmk8WT5ck725Xa7SNOEg4=" />
<div><label for="txt0">0</label><input name="txt0" id="txt0" type="text" /></div>
<div><label for="txt1">1</label><input name="txt1" id="txt1" type="text" /></div>
<div><label for="txt2">2</label><input name="txt2" id="txt2" type="text" /></div>
<div><label for="txt3">3</label><input name="txt3" id="txt3" type="text" /></div>
</form>
My guess is that this is because the later-added controls have not been correctly initialised before the page is rendered.
Can anyone enlighten me?
Many thanks in advance.
Gary
==============
The .aspx file
==============
<%@ Page Inherits="CompanyPage" Src="classes/company_page.cs" %>
====================
The Code-behind file
====================
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using MyNamespace;
public class CompanyPage : MyNamespace.ExtendedPage{
//--------------------------------------------------------------------------------------------------
protected override void OnInit(System.EventArgs e){
for(int i = 0; i < 10; i++){
//add some text boxes and labels to the page
this.AddTextBox("Text" + i, "txt" + i);
}
base.OnInit(e);
}
//--------------------------------------------------------------------------------------------------
}
===========================
The Base Classes (compiled)
===========================
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
namespace MyNamespace{
public class BasicPage : System.Web.UI.Page{
//--------------------------------------------------------------------------------------------------
protected String Footer{
get{
return("...</body></html>");
}
}
//--------------------------------------------------------------------------------------------------
protected String Header{
get{
return("<html><head>...");
}
}
//--------------------------------------------------------------------------------------------------
}
public class ExtendedPage : BasicPage{
//--------------------------------------------------------------------------------------------------
protected void AddTextBox(String strLabel, String strName){
this.Controls.Add(new LiteralControl("<div>"));
this.Controls.Add(new LiteralControl("<label for=\"" + strName + "\">" + strLabel + "</label>"));
HtmlInputText ctrl = new HtmlInputText();
ctrl.ID = strName;
this.Controls.Add(ctrl);
this.Controls.Add(new LiteralControl("</div>\n"));
}
//--------------------------------------------------------------------------------------------------
private void AddExistingControls(HtmlForm form){
//****************************************************
// Add existing controls to form and remove from class
//****************************************************
for(int i = 0; i < this.Controls.Count; i++){
//get first control in collection
System.Web.UI.Control ctrl = this.Controls[0];
//add control to form
form.Controls.Add(ctrl);
//remove control (gets added back along with form in BuildPage)
this.Controls.Remove(ctrl);
}
}
//--------------------------------------------------------------------------------------------------
protected void BuildPage(HtmlForm form){
//***************
// Build the page
//***************
//this.Controls.Clear();
//add page header
this.Controls.AddAt(0, new LiteralControl(Header));
//add form
this.Controls.Add(form);
//add page footer
this.Controls.Add(new LiteralControl(Footer));
}
//--------------------------------------------------------------------------------------------------
private HtmlForm GetForm(){
//********************************************************
// Returns HtmlForm containing controls added to sub-class
//********************************************************
HtmlForm form = new HtmlForm();
form.ID = "frmApp";
//objects passed by reference!
AddExistingControls(form);
return form;
}
//--------------------------------------------------------------------------------------------------
protected override void OnInit(System.EventArgs e){
BuildPage(GetForm());
base.OnInit(e);
}
//--------------------------------------------------------------------------------------------------
}
}
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