Re: How to detect arrows key in key press event handler? - C# Discussion Boards

Re: Creating a number of buttons with different onclick commands

Matjaz-xyz5-Nov-08 5:02

Matjaz-xyz

5-Nov-08 5:02

Thank you BOTH for your answers! I just learned how to make something new with your help. Thanks a lot!!!! Smile | :)

And thanks for adding some more samples and explanation with the code as otherwise i wouldnt fully understand the first sample from cocoon Smile | :)

Thanks again Smile | :)

If u guys come to Slovenia one day - i owe u a beer Wink | ;)

Força Barça!

How to detect arrows key in key press event handler?

cocoonwls4-Nov-08 19:12

cocoonwls

4-Nov-08 19:12

dear all,

I would like to know how can i detect the arrows key (left and right) when key press event handler in window application?

thanks in advance.

regards
cocoonwls

Re: How to detect arrows key in key press event handler?

Pedram Behroozi4-Nov-08 19:33

Pedram Behroozi

4-Nov-08 19:33

The KeyPress event is not raised by noncharacter keys; however, the noncharacter keys do raise the KeyDown and KeyUp events.

in KeyDown or KeyUp events you can detect arrows by e.KeyCode.

When you're alone in the Dark, Fear will protect you...

Re: How to detect arrows key in key press event handler? [modified]

Matjaz-xyz4-Nov-08 19:34

Matjaz-xyz

4-Nov-08 19:34

Simple. With ASCII Code.

lets take an example of pressing the keys in just form1:

if(e.KeyChar==37)<br />
                txtStatus.Text = "You've pressed the left arrow key.";<br />
            if(e.KeyChar==38)<br />
                txtStatus.Text = "You've pressed the up arrow key.";<br />
            if(e.KeyChar==39)<br />
                txtStatus.Text = "You've pressed the right arrow key.";

This is just a small example to get you started and so that u get to know the use of ASCII char tables.
Edit: Well it would be, if it would work... kinda forgot how i used this stuff.

Heres a good link on explanating the keypress control:
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.keypress(VS.71).aspx[^]

Greets,
Matjaž

Força Barça!

modified on Wednesday, November 5, 2008 1:54 AM

Re: How to detect arrows key in key press event handler? [modified]

cocoonwls4-Nov-08 20:10

cocoonwls

4-Nov-08 20:10

Hi Pedram Behroozi and max00slo,

I have tried it before, for other char is OK, but i just can't detect the arrows key.It never fire the keydown event. What i am do in my application is, i create the keydown event handler in one of my custom UI control, and it will pass the event args to one of my class via a abstract class.

any ideas are welcome.
thanks in advance

cocoonwls

modified on Wednesday, November 5, 2008 2:16 AM

Re: How to detect arrows key in key press event handler?

Pedram Behroozi4-Nov-08 22:35

Pedram Behroozi

4-Nov-08 22:35

cocoonwls wrote:
i just can't detect the arrows key

Didn't this work?

if (e.KeyCode == Keys.Right)
{
    ...
}

When you're alone in the Dark, Fear will protect you...

Re: How to detect arrows key in key press event handler?

cocoonwls4-Nov-08 23:12

cocoonwls

4-Nov-08 23:12

Thanks for reply.
yes, i also try it .keycode, but still can't fix it.. Frown | :(

Re: How to detect arrows key in key press event handler?

dan!sh 4-Nov-08 22:03

dan!sh

4-Nov-08 22:03

You will need to override ProcessCmdKey method to catch the arrow key press.

HAPPY DIWALI[^]

Re: How to detect arrows key in key press event handler?

cocoonwls4-Nov-08 23:15

cocoonwls

4-Nov-08 23:15

Hi d@nish,

Can you please give me a simple explain on it, where should i put the override code, and should i add the virtual method on it(for override)?

thanks in advance
cocoonwls

Re: How to detect arrows key in key press event handler?

dan!sh 5-Nov-08 0:16

dan!sh

5-Nov-08 0:16

You just need to override the method in your class. This VB.Net[^] code should get you going with it.

HAPPY DIWALI[^]

Re: How to detect arrows key in key press event handler?

cocoonwls6-Nov-08 15:15

cocoonwls

6-Nov-08 15:15

Thanks

i got it!

Re: How to detect arrows key in key press event handler?

vaynenick18-Jun-14 22:19

vaynenick

18-Jun-14 22:19

you must derive a new class that is based on the class of the control that you want, and you override the ProcessCmdKey().

Syntax:

C#:
 protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    //handle your keys here
}

Full source code..C# Arrow Key Press

Vayne

PictureBox and ThumbNail code causing Application to NOT close.

swjam4-Nov-08 19:02

swjam

4-Nov-08 19:02

I've got the following code that attaches a thumbnail image coming from an ImageList to a PictureBox. However, it is causing my application to not close once the code block gets executed. I suspect this has got to do with the resource(the photo file) not being released properly, I may be wrong though. Any experts advice would be greatly appreciated. All the best!

<br />
      Image.GetThumbnailImageAbort myCallback =<br />
                                       new Image.GetThumbnailImageAbort(ThumbnailCallback);<br />
      Image myThumbnail = this.imageList1.Images[0].GetThumbnailImage(this.pictureBox1.Size.Width-5, this.pictureBox1.Size.Height-5, myCallback, IntPtr.Zero);<br />
//      e.Graphics.DrawImage(myThumbnail, 150, 75);<br />
 <br />
      this.pictureBox1.Image = myThumbnail;<br />
      this.pictureBox1.SizeMode = PictureBoxSizeMode.CenterImage;

----------------------------------------------------------
"unzip; strip; touch; finger; mount; fsck; more; yes; unmount; sleep" - my daily unix command list

Re: PictureBox and ThumbNail code causing Application to NOT close.

Simon P Stevens4-Nov-08 22:34

Simon P Stevens

4-Nov-08 22:34

The code works fine for me.

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        Image.GetThumbnailImageAbort myCallback = new Image.GetThumbnailImageAbort(ThumbnailCallback);
        Image myThumbnail = this.imageList1.Images[0].GetThumbnailImage(this.pictureBox1.Size.Width - 5, this.pictureBox1.Size.Height - 5, myCallback, IntPtr.Zero);
        this.pictureBox1.Image = myThumbnail;
        this.pictureBox1.SizeMode = PictureBoxSizeMode.CenterImage;
    }

    private bool ThumbnailCallback()
    {
        return true;
    }
}

And the app exits fine.

Failure to exit is usually caused by a thread not terminating correctly. Does your abort callback get triggered? Does it correctly return?

You don't need to release the Image. This is handled by the Imagelist for you provided that you have added your image list via the designer or correctly disposed of it manually, either way though, this wouldn't prevent your app from closing.

After you have closed your app, and it's stuck without terminating, try hitting the pause button and looking at the call stack to see where it is stuck.

Simon

how to remove whitespace(<p><\p> )using stringbuilder in c#</p>

raj2313624-Nov-08 18:49

raj231362

4-Nov-08 18:49

hello all,

i am new in window apllication c#. when i load rtf file in richtextbox control with every new paragraph with

and <\p>.
i have done this..but can't remove whitespace.
he show with blankspace

<\p>.

like..there is five paragraph in file.

aaaaaaaaaaaaaaaaaaaaaaaaaa<\p>

<\p>

aaaaaaaaaaaaaaaaaaaaaaaaaa<\p>

aaaaaaaaaaaaaaaaaaaaaaaaaa<\p>

here, i want to remove two blanckspaces..

Re: how to remove whitespace(<\p> )using stringbuilder in c#

leppie4-Nov-08 20:58

leppie

4-Nov-08 20:58

what is <\p> ?

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 beta 1 - out now!
((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))

Re: how to remove whitespace(<\p> )using stringbuilder in c#

raj2313624-Nov-08 21:49

raj231362

4-Nov-08 21:49

Thanks leppie.

how To Add Product key Setup

Piyush Vardhan Singh4-Nov-08 18:39

Piyush Vardhan Singh

4-Nov-08 18:39

how To Add Product key Setup please help me

Piyush Vardhan Singh
p_vardhan14@rediffmail.com
http://holyschoolofvaranasi.blogspot.com
http://holytravelsofvaranasi.blogspot.com

Re: how To Add Product key Setup

leppie4-Nov-08 20:58

leppie

4-Nov-08 20:58

We cant help if we dont know your specific problem.

xacc.ide - now with TabsToSpaces support
IronScheme - 1.0 beta 1 - out now!
((lambda (x) `((lambda (x) ,x) ',x)) '`((lambda (x) ,x) ',x))

RegisterHotKey help

MeekLogic4-Nov-08 18:30

MeekLogic

4-Nov-08 18:30

I want to modify this RegisterHotKey func to allow me to set it using HashKey instead of a shortcut key but I'm not exactly sure how to do this.

this is the code for registering the hotkey in the object

protected bool RegisterHotkey(Shortcut key)
{   //register hotkey
    int mod=0;
    Keys k2=Keys.None;
    if (((int)key & (int)Keys.Alt)==(int)Keys.Alt) {mod+=(int)Win32.Modifiers.MOD_ALT;k2=Keys.Alt;}
    if (((int)key & (int)Keys.Shift)==(int)Keys.Shift) {mod+=(int)Win32.Modifiers.MOD_SHIFT;k2=Keys.Shift;}
    if (((int)key & (int)Keys.Control)==(int)Keys.Control) {mod+=(int)Win32.Modifiers.MOD_CONTROL;k2=Keys.Control;}

    System.Diagnostics.Debug.Write(mod.ToString()+" ");
    System.Diagnostics.Debug.WriteLine((((int)key)-((int)k2)).ToString());

    return Win32.User32.RegisterHotKey(m_Window.Handle, this.GetType().GetHashCode(), (int)mod, ((int)key) - ((int)k2));
}

Set a license screen in deployment of Window based project.

sumit70344-Nov-08 17:36

sumit7034

4-Nov-08 17:36

Hi guys,

I have created a windows based project for my client and it works fine for him. He is my client and want to sell this product to further clients, so for this he wants that in deployment of the project a screen should appear that shows about to insert a license key and it must match with a license which is stored in an online database.

Creation of database and checking of license key is I think is not typical, but the typical act is how to create a screen which appears in the deployment of that project and appears at the time of installation.

If any one help me then I will be highly thankful to that person.

Thanks in Advance

Re: Set a license screen in deployment of Window based project.

cyber-drugs5-Nov-08 0:29

cyber-drugs

5-Nov-08 0:29

What you are after, sounds like a Splash Screen:

www.codeproject.com/KB/cs/prettygoodsplashscreen.aspx[^]

You can add additional arguments in the code, which check to see if the project is registered or not, and if it is already registered, to not even display the Splash Screen, and just head to the main screen.

Reading Message from MSMQ and DIsplaying

honeyss4-Nov-08 17:31

honeyss

4-Nov-08 17:31

Hi,
I want to display the messages from Queue in consoleapplication.I am able to read the queues.But while displaying, if i had 6 messages in queue and in that i am able to display only 3.Please help me out in solving this.
My code is as follows:

string QueueName = ".\\Private$\\TestQ";

MessageQueue.EnableConnectionCache = false;
//// open the selected message queue
this.messageQueue = new MessageQueue(QueueName, QueueAccessMode.Receive);
while (true)
{
System.Messaging.Message message = new System.Messaging.Message();
MessageQueueTransaction msgTx = new MessageQueueTransaction();
MessageDetails messageDetails = null;
try
{
msgTx.Begin();
message.Formatter = new BinaryMessageFormatter();
message = messageQueue.Receive(new TimeSpan(0, 0, 0, 10), msgTx);

if (message.Body != null)
{
messageDetails = (MessageDetails)message.Body;

Console.WriteLine(messageDetails.ApplicationName + "\t" + messageDetails.ThreadName + "\t" + messageDetails.Status + "\t" + messageDetails.TimeStamp);
}

msgTx.Commit();
messageQueue.BeginReceive();

}

Thanks in Advance

Re: Reading Message from MSMQ and DIsplaying

Jimmanuel5-Nov-08 1:06

Jimmanuel

5-Nov-08 1:06

is messageQueue subscribed to receive the callback from the BeginReceive() call? if not that'll probably discard every other message in the queue.

Print screen including the cursor image working except for IBeam cursor

xax4-Nov-08 15:59

xax

4-Nov-08 15:59

I've tried to capture the desktop with the cursor image using different codes and none manages to draw the IBeam cursor. If I use the Cursor.Current, I always get the waitcursor; using API, I get the correct cursor. Is there a workaround?

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.