.NET (Core and Framework)

16-Feb-06 18:31

Ok, I am using a global hook, and I am wondering how I can keep the keys from sending to the active program.

I searched around the net and CodeProject and I just can't figure it out. I'm not terribly familiar with WindowsAPI stuff.

Thanks in advance.

-- modified at 19:33 Friday 17th February, 2006

George L. Jackson17-Feb-06 13:22

George L. Jackson

17-Feb-06 13:22

You just figured it out? So, what is your problem? Smile | :)

-- modified at 19:23 Friday 17th February, 2006

digiwombat17-Feb-06 13:33

17-Feb-06 13:33

Just *can't* figure out.

Why is it that we always leave out the mosti mportant words? haha.

George L. Jackson17-Feb-06 13:33

George L. Jackson

17-Feb-06 13:33

This might help: http://msdn2.microsoft.com/en-us/library/system.windows.forms.application.addmessagefilter.aspx[^]

<br />
static void Main() <br />
{<br />
    Application.AddMessageFilter(new TestMessageFilter());<br />
    Application.Run(new Form1());<br />
}<br />
<br />
public class TestMessageFilter : IMessageFilter <br />
{<br />
    public bool PreFilterMessage(ref Message m) <br />
    {<br />
        const int WM_KEYDOWN= 0x0100;<br />
        // Blocks all the messages relating to the left mouse button.<br />
        if (m.Msg==WM_KEYDOWN) <br />
        {<br />
            MessageBox.Show("KeyDown hitted"); <br />
        }<br />
<br />
        return false;<br />
    }<br />
}<br />
<br />

-- modified at 19:54 Friday 17th February, 2006

[Marc]17-Feb-06 13:46

[Marc]

17-Feb-06 13:46

What type of hook are you using? A really global hook that captures all keyboard events from the whole system, or a hook that only applies to one application? Maybe you can show us a bit of code?

"..Commit yourself to quality from day one..it's better to do nothing at all than to do something badly.."
-- Mark McCormick

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digiwombat17-Feb-06 14:08

17-Feb-06 14:08

It is a global keyboard hook. I am using the Kennedy.ManagedHooks DLL from this site. I enable it with a hotkey, and disable it the same way.

public Form1()<br />
        {<br />
            // Alt = 1, Ctrl = 2, Shift = 4, Win = 8<br />
            Form1.RegisterHotKey(this.Handle,this.GetType().GetHashCode(), 8, (int)'P');<br />
            InitializeComponent();<br />
            keyboardHook = new Kennedy.ManagedHooks.KeyboardTracking();<br />
            keyboardHook.KeyboardEvent += new Kennedy.ManagedHooks.KeyboardTracking.KeyboardEventHandler(keyboardHook_KeyboardEventExt);<br />
            <br />
        }<br />
protected override void WndProc(ref Message m)<br />
        {<br />
            if (m.Msg == 0x0312)<br />
                if (keyboardHook.IsHooked)<br />
                {<br />
                    keyboardHook.UninstallHook();<br />
                    input = false;<br />
                    textBox4.Text = "";<br />
                }<br />
                else<br />
                {<br />
                    textBox4.Text = "";<br />
                    keyboardHook.InstallHook();<br />
                    input = true;<br />
                }<br />
             base.WndProc(ref m);<br />
        }<br />
 private void keyboardHook_KeyboardEventExt(Kennedy.ManagedHooks.KeyboardEvents kEvent, Keys key)<br />
        {<br />
            bool shi;<br />
            if(keyboardHook.ShiftPressed == true)<br />
                shi = true;<br />
            else<br />
                shi = false;<br />
            if(kEvent == KeyboardEvents.KeyDown){<br />
                string msg;<br />
                //snipped out some key parsing junk.<br />
                if(shi == true)<br />
                    msg = key.ToString();<br />
                else<br />
                    msg = key.ToString().ToLower();<br />
                textBox4.Text += msg;<br />
            }<br />
}<br />

I think that covers all the relevant code from my end of the application. If there are any questions about what anything does more specifically, I can answer those. The Hotkey works fine, and I am planning to add the message filter or whatever when it hotkeys in and remove it when they hotkey out of the hook, obviously. Thanks for the help thus far.

Dave Kreskowiak17-Feb-06 14:59

17-Feb-06 14:59

Well, in the "real" global hook implementation I did in C++, years ago, the solution is simple. You just don't pass the keystroke message up the hook chain. But I don't see a way to do that, or more to the point NOT do that, using this library. At least it's not obvious in the code you've posted.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

digiwombat17-Feb-06 17:16

17-Feb-06 17:16

Also, I am using WH_KEYBOARD_LL to hook, if that helps out more.

digiwombat17-Feb-06 18:06

17-Feb-06 18:06

Ok, I am just going to use blockinput() I think. It blocks the mouse too, but oh well.

Dave Kreskowiak18-Feb-06 3:33

18-Feb-06 3:33

All you need to do to eat the key message is NOT call the CallNextHookEx function in your KeyboardProc handler. It's that simple...

LowLevelKeyboardProc Function[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

-- modified at 9:33 Saturday 18th February, 2006

digiwombat18-Feb-06 10:40

Letting the Parent handle the click

18-Feb-06 10:40

Thanks! I'll go mess around with my hooking code.

flash with .net

Vineet Rajan16-Feb-06 6:15

Vineet Rajan

16-Feb-06 6:15

hi all

can anyone tell me how to import a flash file into a .NET winForm ? please suggest appropriate class libraries.

thanks

Eric Schaefer16-Feb-06 2:35

Eric Schaefer

16-Feb-06 2:35

Hi!

I want to compose a large UserControl of many sub-controls. These children may also be composed of many other controls.
All the childs and grandchilds are not supposed to handle Click events themselves. How can the event be propagated to the parent without subscribing to the Click events of all children and grandchildren and grandgrandchildren an so on?

Thanks,
Eric

Windows Forms and 3rd Party API's

robasmith15-Feb-06 9:27

robasmith

15-Feb-06 9:27

Please excuse my ignorance on this whole .NET thing but I guess everyone in this field eventually gets around to it...

From what I understand, Windows Forms are the next generation of MFC designed for use in a .NET, managed code environment. Is that correct?

Does this mean I have to write managed code to use 3rd party api's that are built on Windows Forms (i.e., Dundas Chart, Gauge and Diagram products)?

Or, can I continue to write unmanaged code and still utilize Windows Forms based api's in C++ code? In other words, can I use the Dundas products in unmanaged C++ code?

Thanks in advance!

Bob

Re: Windows Forms and 3rd Party API's

Dave Kreskowiak15-Feb-06 14:32

Converting from WinHelp to HTML Help

15-Feb-06 14:32

If the component is a managed code class library, then no you can't use it directly from unmanaged code. You'd have to go through a COM to get at the managed classes, if those classes are exposed to COM.

Exposing .NET Framework Components to COM[^]

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

ellenu15-Feb-06 6:40

ellenu

15-Feb-06 6:40

I was wondering how much work is involved on the developer's side to convert an application to calling WinHelp to HTML (or Web) Help.

Are there some standard steps a programmer should go through to ensure this transition is clean and works properly? This is for a .NET environment.

If you've been through this, any information would be helpful.

Thank you,
ellenu

Flex Cell 2.0 .net Framework

welbert14-Feb-06 15:03

welbert

14-Feb-06 15:03

need help where to download a free full version of FlexCell 2.0 .net framework..... really appreciated if you can provide a link where i can download it for free...

tnx tnx tnx and more power............... Cool | :cool:

Re: Flex Cell 2.0 .net Framework

Judah Gabriel Himango15-Feb-06 8:12

Judah Gabriel Himango

15-Feb-06 8:12

You can download a free trial[^].

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Connor's Christmas Spectacular!
Judah Himango

The request failed with HTTP status 401: Unauthorized

Paul_Taylor14-Feb-06 14:12

Paul_Taylor

14-Feb-06 14:12

I'd love to hear from anyone with an opinion on how to go about resolving the problem below:

I have a Web Service that allows for files to be uploaded. Because of the default limitation of 4MB in parameters, I allow repeated calls to the file upload function sending chunks of the file at a time. The Web Service then appends the file together at the server end. All works perfectly when running the Web Service on my computer, but when running the Web Service on a server (of which I am an Administrator) there is an issue.

In my Test program that calls the Web Service I setup Authentication:
l_wsService.PreAuthenticate = True
l_wsService.Credentials = CredentialCache.DefaultCredentials

My first call to the file uploading function works successfully. It's the second call to the same function that fails with the error "The request failed with HTTP status 401: Unauthorized". The program never gets inside the function the second time, failing on this error before it reaches the function. After the first call I reload one parameter with the next chunk of the file but don't change anything to do with the service or it's authentication settings.

When I have a file small enough not to break into chunks I can upload it and make subsequent calls to different functions within this same Web Service without a problem. When I have multiple small files the uploading of the second file fails.

My questions are:
How can I get this to work?
If this is a security problem then why does it only occur on the second call to this one function?

Regards,
Paul

-- modified at 20:14 Tuesday 14th February, 2006

Re: The request failed with HTTP status 401: Unauthorized

Paul_Taylor14-Feb-06 18:30

Paul_Taylor

14-Feb-06 18:30

Worked out the answer:
l_wsService.PreAuthenticate = False

It seems to go against everything that I have read on other websites, but it works.

I'd still love for someone to explain exactly why.

Regards,
Paul.
Smile | :)

console.writeline windows application equivalent

LuluSailor14-Feb-06 8:06

LuluSailor

14-Feb-06 8:06

What is the windows based equivalent to System.Console.WriteLine? I read somewhere (but now cannot find where!) that when your are developing a Windows Application, you should avoid using System.Console.WriteLine and use something else instead.... what would this be? I want something very simple that I can quickly use just like System.Console.WriteLine.

Why I am asking...I am learning C# but prefer to learn using C# project that are Windows Applications. The examples in books use System.Console.Writeline. The code might contain a bunch of writeline statements for showing your results.

I know I could change the C# Output Type temporarily to Console Application and continue to use the System.Console.WriteLine. This solves my problem, but not in the way I would like to solve this. I thought there was some windows-based equivalent to System.Console.Writeline.

Re: console.writeline windows application equivalent

Dave Kreskowiak14-Feb-06 10:08