Re: Sys-wide keyboard hook - C# Discussion Boards

Re: About shared assembly.

24-Jul-02 23:54

Feng Qin wrote:
1.I can add an assembly to cache, but I cannot find it in dialog when you click "Add reference", how can I let my assembly to the dialog's .net assembly list?

In the registry you will find a key where it lists all the directories it will search for. On my computer this is located at HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramework\AssemblyFolders. Just follow the pattern there and you'll be able to add your install folder to the list so that your assembly is listed in the "Add Reference" dialog.

If you don't want to modify the registry you can put the assembly in the %WINDIR%\Microsoft.NET\Framework\v1.0.3750\ directory and you should see it in the "Add Reference..." dialog. This is one of the directories that is specified in the registry in the above location.

James
"Java is free - and worth every penny." - Christian Graus

Feng Qin25-Jul-02 0:03

Feng Qin

25-Jul-02 0:03

Thank you, James, but how about 2nd question?

I'm amumu, and you?

Re: About shared assembly.

James T. Johnson25-Jul-02 0:08

Re: Sys-wide keyboard hook

25-Jul-02 0:08

I've never used the binding redirect before so I can't really comment on how to get it working properly.

James
"Java is free - and worth every penny." - Christian Graus

Sys-wide keyboard hook

Anonymous24-Jul-02 19:14

Anonymous

24-Jul-02 19:14

I need to hook the keyboard messages system wide. This can be done by using SetWindowsHookEx() to do this.

HHOOK SetWindowsHookEx(int idHook, HOOKPROC lpfn, HINSTANCE hMod, DWORD dwThreadId);

I got everything to work except the third param. What do I use for a handle if I want to do System wide hook?

Thanks for your time

Luis Alonso Ramos24-Jul-02 21:02

Re: Sys-wide keyboard hook

24-Jul-02 21:02

This is not a C# question, but I'll answer anyway. Use 0 as the thread ID. Also, you will need to put your hook funcion in a DLL, so it can be loaded in every process.

-- LuisR

──────────────
  Luis Alonso Ramos
  Chihuahua, Mexico
  www.luisalonsoramos.com

"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein

Alex Korchemniy25-Jul-02 7:20

Alex Korchemniy

25-Jul-02 7:20

Thanks for the information provided.

This is what I have right now:
public void StartHook()
{
int hookType = (int)NativeMethods.WH.KEYBOARD;
myHookProc = new NativeHookMethods.HookProc(this.hookProc);
hookHandle = NativeHookMethods.SetWindowsHookEx(hookType,
myHookProc, ??? Confused | :confused:

??, 0);
}

What do I put in the third parameter? Please help

Re: Sys-wide keyboard hook

Luis Alonso Ramos25-Jul-02 10:57

25-Jul-02 10:57

So it's C# after all?

See the docs for SetWindowsHookEx here:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp[^]

the hMod (third) parameter contains the module handle of the module (EXE or DLL, must be DLL if systemwide) that contains the hook procedure.

I'd recommend you to write the DLL with the hook function in straigth Win32 SDK code, so it is smaller (imagine having to load all .NET runtimes in every process??) Export two routines to start and stop the hook, and from the hook procedure you could send a message to your app's window (written in C#).

-- LuisR

──────────────
  Luis Alonso Ramos
  Chihuahua, Mexico
  www.luisalonsoramos.com

"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein

Copy Constructor

Johnny Zee24-Jul-02 16:54

Johnny Zee

24-Jul-02 16:54

Anybody can help me how can I implement C++ Copy Constructor in C# with a generic example.

Thanks in advance

James T. Johnson24-Jul-02 18:08

24-Jul-02 18:08

You do it just like you would with C++; however the more correct method is to implement the ICloneable interface.

class Foo : ICloneable
{
  public int bar;
  public SomeClass baz;
  
  public Foo()
  {
    bar = 0;
    baz = new SomeClass();
  }
  
  public Foo(Foo sourceCopy)
  {
    bar = sourceCopy.bar;
    baz = sourceCopy.baz; // <- be careful see Clone method
  }
  
  public Foo Clone()
  {
    Foo f = new Foo();
    f.bar = bar;
    f.baz = new SomeClass();
    // Perform operations on f.baz
    // so that its state is the same as
    // this.baz
  
    return f;
  }

  object ICloneable.Clone()
  {
     return Clone(); // Call the strongly-typed
     // Clone method
  }
}

James
"Java is free - and worth every penny." - Christian Graus

Johnny Zee25-Jul-02 2:27

Johnny Zee

25-Jul-02 2:27

Thanks James you are always a good resource.

albean28-Jul-02 14:22

albean

28-Jul-02 14:22

Hi,

I was wondering if the the Clone() method in the Foo class needs to be public. I've been using C# now for about 10 minutes,;P so please forgive me if this is a dumb question.

Thanks.

James T. Johnson28-Jul-02 16:01

Re: ConfigurationSettings

28-Jul-02 16:01

Its not a dumb question at all because the answer isn't obvious.

In the Foo class there are two different implementations of Clone(), one which is a member of the class and the other is Foo's implementation of ICloneable.

Interfaces in C# (and .NET) require that their members be public; so when I specifically implemented the Clone method as Foo's implementation of ICloneable I didn't need to specify the public access modifier.

In C# there are two different ways to implement an interface.

The first method is by adding a public member for each item in the interface you are implementing. Most people probably use this technique to implement an interface.

interface IBar
{
  object Bar();
}
 
class Foo : IBar
{
  ....
  
  public object Bar()
  {
     ....
  }
}

The second method is to specify in the member's signature what interface it is implementing.

class Baz : IBar
{
  ...
 
  object IBar.Bar()
  {
    ....
  }
}

Unlike the first method the only way to use this member is cast the object to the interface (IBar ib = (IBar) myBaz;). Now you can use the member as if it were any other interface.

This also gives an advantage for the users of your class. You can provide two different implementations of a member: one to be used when dealing with the interface, the other to be used when dealing with the class itself.

Most of the collections in the .NET class library do this to provide a strongly-typed collection while also implementing the generic interfaces that provide a standard way of using a collection.

Hope that answers your question

James
"Java is free - and worth every penny." - Christian Graus

ConfigurationSettings

Steve Severance24-Jul-02 13:12

Steve Severance

24-Jul-02 13:12

I am trying to read a custom config section but its not working. ConfigurationSetting.GetConfig() returns null;
CONFIG FILE:
<configuration>
<configSections>
<section name="data" type="System.Configuration.SingleTagSectionHandler"/>
</configSections>

<data Server="GODSWORKSTATION" Username="MedWizard" Password="MedWizard" Security="SSPI"
PersistSecurity="false" Pooling="false" MinPool="20" MaxPool="1000" NetworkLibrary="dbmssocn"/>
</configuration>

CODE:
IDictionary valueTable = (IDictionary)ConfigurationSettings.GetConfig("data");

string Server = (string)valueTable["Server"];
string Username = (string)valueTable["Username"];
string Password = (string)valueTable["Password"];
string Encrypt = (string)valueTable["Encrypt"];
string Security = (string)valueTable["Security"];

Any ideas? Thanks.

Steve

Not all who wander are lost...

James T. Johnson24-Jul-02 16:18

Re: ConfigurationSettings

24-Jul-02 16:18

You need to change the section line to specify the full assembly name (since the assembly has a strong name this means the typename, the assembly name, version, and public key token).

<section name="data" type="System.Configuration.SingleTagSectionHandler, System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>

I have an article that's done but needs formatting and proofreading before I post it.

James
"Java is free - and worth every penny." - Christian Graus

jparsons25-Jul-02 2:45

jparsons

25-Jul-02 2:45

I'm getting a 404 on your article.

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Re: ConfigurationSettings

James T. Johnson25-Jul-02 2:50

25-Jul-02 2:50

Oops

it should have been configurationhandler not section Smile | :)

Correct link[^]

James
"Java is free - and worth every penny." - Christian Graus

Namespace Hell

stephen woolhead24-Jul-02 13:12

stephen woolhead

24-Jul-02 13:12

I have a c# project that is causing me problems at the moment.

I have a file that looks like this

------------

using System ;

namespace MyNameSpace.System
{
public class Test
{
public Test ()
{
System.Diagnostics.Trace.Writeline ("Hello World!") ;
}
}
}

------------

the problem is that when I compile this it VS complains that the namespace Diagnostics does not exist in MyNameSpace.System

Also when I type System. the intelisense gives me a choice of 'Test' only i.e. my clases in the MyNameSpace.System namespace.

if I change the line to
Diagnostics.Trace.Writeline ("Hello World!")
dropping the System it all compiles.

Is this normal namespace behaviour? If not (hope not as this sucks) anyone got any idea on how to fix it?

Thanks

Stephen.

James T. Johnson24-Jul-02 16:08

24-Jul-02 16:08

Stephen Woolhead wrote:
Is this normal namespace behaviour?

Yep. Perhaps Eric can explain it better (I just spent 10 minutes trying to and couldn't get it out right) but IIRC namespaces are evaluated from right to left, so the System matches before it gets to the root System namespace; however Diagnostics doesn't match until it gets to the root System namespace.

James
"Java is free - and worth every penny." - Christian Graus

stephen woolhead24-Jul-02 22:13

stephen woolhead

24-Jul-02 22:13

Just seemed strange to me that as I was in the namespace MyNameSpace.System and had a using statement for System when I was used System.Diagnostics, that it should resolve to MyNameSpace.System.Diagnostics instead of trying the following

MyNameSpace.System.System.Diagnostics (Current namespace)
System.System.Diagnostics (Using System Statement)
System.Diagnostics (using the global namespace)

Of which the last one would have been resolved.

Is there a way to say that this is the start of the namespace do not append to anything, something like ::System in C++ ?

Thanks

Stephen

James T. Johnson25-Jul-02 0:16

25-Jul-02 0:16

Stephen Woolhead wrote:
Just seemed strange to me

It does to me too; perhaps this will be addressed in the future (so that it tries all the way up instead of stopping at the first failure -- MyNameSpace.System.Diagnostics)

Stephen Woolhead wrote:
Is there a way to say that this is the start of the namespace do not append to anything

Not that I know of, I think something is needed at any rate.

James
"Java is free - and worth every penny." - Christian Graus

Problems with ListView and columns

jparsons25-Jul-02 2:49

jparsons

25-Jul-02 2:49

Stephen Woolhead wrote:
Is there a way to say that this is the start of the namespace do not append to anything, something like ::System in C++ ?

No but you can try this code example. It's an almost solution to the problem.

using System;
using WinSystem=System;

namespace Test.System { 

	public class Test {
		public static void Main(String[] args) { 
			WinSystem.Console.WriteLine("Hello World");
		}
	}
}

Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n

Luis Alonso Ramos24-Jul-02 9:53

Re: Problems with ListView and columns

24-Jul-02 9:53

Hi everybody!

I have the following code in the constructor:

        lstUsers = new ListView();<br />
        lstUsers.Parent = this;<br />
        lstUsers.Location = new Point(0, panelTitle.Height);<br />
        lstUsers.Size = new Size(Width, Height - lstUsers.Location.Y + 1);<br />
        lstUsers.Anchor = AnchorStyles.Left | AnchorStyles.Top |<br />
            AnchorStyles.Right | AnchorStyles.Bottom;<br />
        lstUsers.View = View.Details;<br />
<br />
        lstUsers.Columns.Add("Clave",    150, HorizontalAlignment.Left);<br />
        lstUsers.Columns.Add("Nombre",   250, HorizontalAlignment.Left);<br />
        lstUsers.Columns.Add("Permisos", 100, HorizontalAlignment.Right);<br />

The list view appears ok, and when I add items, I can see them in large icon mode (if I remove the View = Details), but in Details mode I don't see anything... not even the column headers (after adding the columns I verified and Columns.Items.Count is indeed 3)

Any ideas???

-- LuisR

──────────────
  Luis Alonso Ramos
  Chihuahua, Mexico
  www.luisalonsoramos.com

"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein

leppie24-Jul-02 20:44

leppie

24-Jul-02 20:44

Hi, try adding

listUsers.HeaderStyle = System.Windows.Forms.ColumnHeaderStyle.Nonclickable;

or Clickable.

Hope this helps Smile | :)

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: Problems with ListView and columns

Luis Alonso Ramos24-Jul-02 21:01