C# Discussion Boards - CodeProject

to get the character which mouse pointer focus on

21-Nov-03 4:26

To do this in .NET (this is the C# forum after all), use the NotifyIcon component, which you can find in your toolbox. It's easy to use.

If it doesn't do everything you need, there are several articles here on CP that discuss / create more advanced components that use the shell API's Shell_NotifyIcon (which the NotifyIcon component does internally as well - just doesn't always expose everything you might need to use).

-----BEGIN GEEK CODE BLOCK-----
Version: 3.21
GCS/G/MU d- s: a- C++++ UL@ P++(+++) L+(--) E--- W+++ N++ o+ K? w++++ O- M(+) V? PS-- PE Y++ PGP++ t++@ 5 X+++ R+@ tv+ b(-)>b++ DI++++ D+ G e++>+++ h---* r+++ y+++
-----END GEEK CODE BLOCK-----

katoya21-Nov-03 3:16

katoya

21-Nov-03 3:16

I want to write a program to get the character which mouse pointer focus on.
Just like that first move the mouse pointer on some character for a while and i could get which character or word it pointed.
It is so diffucult to find proper way to do this.
I have try to use IDataObject d = Clipboard.GetDataObject(); and other thing..
But it fails. because some in some case i could find the character but others no.
Could anyone suggest me one good way suited for every control?
Example......
when i use a MS WORD application.. And put some word there like.
HELP
|
mouse pointer pointed that word and i could get that word is "HELP"....

Thanks in advanced. Big Grin | :-D

Kato

Help with FolderBrowserDialog...

Søren Christensen21-Nov-03 3:16

Søren Christensen

21-Nov-03 3:16

Hi
I need to have a folder browser in my program - and i then added one, but i doesnt work. I then look at msdn.com where i found this pice of code

<br />
using System;<br />
using System.Drawing;<br />
using System.Windows.Forms;<br />
using System.IO;<br />
<br />
public class FolderBrowserDialogExampleForm : System.Windows.Forms.Form<br />
{<br />
    private FolderBrowserDialog folderBrowserDialog1;<br />
    private OpenFileDialog openFileDialog1;<br />
    <br />
    private RichTextBox richTextBox1;<br />
<br />
    private MainMenu mainMenu1;<br />
    private MenuItem fileMenuItem, openMenuItem;<br />
    private MenuItem folderMenuItem, closeMenuItem;<br />
    <br />
    private string openFileName, folderName;<br />
<br />
    private bool fileOpened = false;<br />
<br />
    // The main entry point for the application.<br />
    static void Main() <br />
    {<br />
        Application.Run(new FolderBrowserDialogExampleForm());<br />
    }<br />
<br />
<br />
    // Constructor.<br />
    public FolderBrowserDialogExampleForm()<br />
    {<br />
        this.mainMenu1 = new System.Windows.Forms.MainMenu();<br />
        this.fileMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.openMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.folderMenuItem = new System.Windows.Forms.MenuItem();<br />
        this.closeMenuItem = new System.Windows.Forms.MenuItem();<br />
<br />
        this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();<br />
        this.folderBrowserDialog1 = new System.Windows.Forms.FolderBrowserDialog();<br />
        this.richTextBox1 = new System.Windows.Forms.RichTextBox();<br />
<br />
        this.mainMenu1.MenuItems.Add(this.fileMenuItem);<br />
        this.fileMenuItem.MenuItems.AddRange(<br />
                            new System.Windows.Forms.MenuItem[] {this.openMenuItem,<br />
                                                                 this.closeMenuItem,<br />
                                                                 this.folderMenuItem});<br />
        this.fileMenuItem.Text = "File";<br />
<br />
        this.openMenuItem.Text = "Open...";<br />
        this.openMenuItem.Click += new System.EventHandler(this.openMenuItem_Click);<br />
<br />
        this.folderMenuItem.Text = "Select Directory...";<br />
        this.folderMenuItem.Click += new System.EventHandler(this.folderMenuItem_Click);<br />
<br />
        this.closeMenuItem.Text = "Close";<br />
        this.closeMenuItem.Click += new System.EventHandler(this.closeMenuItem_Click);<br />
        this.closeMenuItem.Enabled = false;<br />
<br />
        this.openFileDialog1.DefaultExt = "rtf";<br />
        this.openFileDialog1.Filter = "rtf files (*.rtf)|*.rtf";<br />
<br />
        // Set the help text description for the FolderBrowserDialog.<br />
        this.folderBrowserDialog1.Description = <br />
            "Select the directory that you want to use as the default.";<br />
<br />
        // Do not allow the user to create new files via the FolderBrowserDialog.<br />
        this.folderBrowserDialog1.ShowNewFolderButton = false;<br />
<br />
        // Default to the My Documents folder.<br />
        this.folderBrowserDialog1.RootFolder = Environment.SpecialFolder.Personal;<br />
<br />
        this.richTextBox1.AcceptsTab = true;<br />
        this.richTextBox1.Location = new System.Drawing.Point(8, 8);<br />
        this.richTextBox1.Size = new System.Drawing.Size(280, 344);<br />
        this.richTextBox1.Anchor = AnchorStyles.Top | AnchorStyles.Left | <br />
                                   AnchorStyles.Bottom | AnchorStyles.Right;<br />
<br />
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);<br />
        this.ClientSize = new System.Drawing.Size(296, 360);<br />
        this.Controls.Add(this.richTextBox1);<br />
        this.Menu = this.mainMenu1;<br />
        this.Text = "RTF Document Browser";<br />
    }<br />
<br />
    // Bring up a dialog to open a file.<br />
    private void openMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        // If a file is not opened, then set the initial directory to the<br />
        // FolderBrowserDialog.SelectedPath value.<br />
        if (!fileOpened) {<br />
            openFileDialog1.InitialDirectory = folderBrowserDialog1.SelectedPath;<br />
            openFileDialog1.FileName = null;<br />
        }<br />
<br />
        // Display the openFile dialog.<br />
        DialogResult result = openFileDialog1.ShowDialog();<br />
<br />
        // OK button was pressed.<br />
        if(result == DialogResult.OK) <br />
        {<br />
            openFileName = openFileDialog1.FileName;<br />
            try<br />
            {<br />
                // Output the requested file in richTextBox1.<br />
                Stream s = openFileDialog1.OpenFile();<br />
                richTextBox1.LoadFile(s, RichTextBoxStreamType.RichText);<br />
                s.Close();    <br />
            <br />
                fileOpened = true;<br />
<br />
            } <br />
            catch(Exception exp)<br />
            {<br />
                MessageBox.Show("An error occurred while attempting to load the file. The error is:" <br />
                                + System.Environment.NewLine + exp.ToString() + System.Environment.NewLine);<br />
                fileOpened = false;<br />
            }<br />
            Invalidate();<br />
<br />
            closeMenuItem.Enabled = fileOpened;<br />
        }<br />
<br />
        // Cancel button was pressed.<br />
        else if(result == DialogResult.Cancel) <br />
        {<br />
            return;<br />
        }<br />
    }<br />
<br />
<br />
    // Close the current file.<br />
    private void closeMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        richTextBox1.Text = "";<br />
        fileOpened = false;<br />
<br />
        closeMenuItem.Enabled = false;<br />
    }<br />
<br />
<br />
    // Bring up a dialog to chose a folder path in which to open or save a file.<br />
    private void folderMenuItem_Click(object sender, System.EventArgs e)<br />
    {<br />
        // Show the FolderBrowserDialog.<br />
        DialogResult result = folderBrowserDialog1.ShowDialog();        <br />
        if( result == DialogResult.OK )<br />
        {<br />
            folderName = folderBrowserDialog1.SelectedPath;           <br />
             if(!fileOpened)<br />
            {<br />
                // No file is opened, bring up openFileDialog in selected path.<br />
                openFileDialog1.InitialDirectory = folderName;<br />
                openFileDialog1.FileName = null;<br />
                openMenuItem.PerformClick();<br />
            } <br />
        }<br />
    }<br />
}<br />

When I copy this into my IDE, and run it - it works fine, but when i write the linies used for the FolderBrowserDialog it doesn´t work. I cant find the System.Enviroment.SpecialFolder enum. I cant find it at msdn.com - but they use it...

Can anyone help me...

thanks in advance

Søren Christensen

Re: Help with FolderBrowserDialog...

Heath Stewart21-Nov-03 4:15

CaptureSound a DirectX code sample

21-Nov-03 4:15

Sometimes VS.NET has a problem showing nested classes, structs, and enums. The System.Environment.SpecialFolder enum is a next enum of the Environment class. Just type it and you should be fine. For information, type "SpecialFolder" in VS.NET's index. Don't forget the power of using the integrated help already on your system, since it is often hard to find things on MSDN because their search doesn't include a simple index like VS.NET's integrated MSDN help.

Also, if you need one in .NET 1.0 (FolderBrowserDialog is only available in .NET 1.1) there is an easy way. Click on "Add References", click the COM tab, and find "Microsoft Shell Controls and Automation". Then you can use simple code like this to get the default one that already exists in Windows (which provides a consistent UI in your app, too):

Shell32.Shell shell = new Shell32.ShellClass();
Shell32.Folder folder = shell.BrowseForFolder(
  this.Handle.ToInt32(), 
  "Destination", 
  0x8000, // See function "BrowseForFolder" in MSDN for customization values
  Shell32.ShellSpecialFolderConstants.ssfDRIVES);
if (folder != null) return ((Folder2)folder).Self.Path;
else return null;

thomasa21-Nov-03 3:01

thomasa

21-Nov-03 3:01

Hey

I've downloaded and installed the DirectX 9.0 SDK from Microsoft.com,
and tried to understand the C# CaptureSound sample that was included.
It seems that it only can capture/save sound for a short periode of time, so you only get the last bits of the sound that was captured.
I think (not realy shore), that it is an integer problem, since it's buffer values is made up of integers, but it can't realy be only that, since there are no values that goes to infinity.

How can I make it capture all of the sound?

Thanks in advance for your help Rose | [Rose]

,
Thomas

Re: CaptureSound a DirectX code sample

Heath Stewart21-Nov-03 4:22

Lets see Heath answer this one then!

21-Nov-03 4:22

In the same, they allocate a buffer to a certain size and read data into it until it's full or you disable the capture. In a rea;-world application, you must keep reading into the buffer and write it out when it's full (it'd be good to have two buffers so you can write a full on in one thread and start reading into the next buffer, then switch and repeat).

It's kind of like reading in a large file using a Stream or TextReader: you should use Stream.Read or TextReader.ReadBlock with a decent buffer size in a loop until data smaller than the buffer is read (the streams and readers take care of the EOF for you).

Martin Cross20-Nov-03 22:59

Martin Cross

20-Nov-03 22:59

The Problem:
I'm running C# and VB.NET projects from sourcesafe, with four developers working on the projects at any given time. The majority of any file references such as .DLLs and .SNK files are done via relative file paths i.e. ..\..\DataAccessLayer.snk.

In some cases, this relative approach doesn't work for some PCs that the developers use. Instead they need to use: \VMR\DAL\DataAccessLayer.snk

OK, you still with me? Good good. Now here's the final straw. We now have a project where neither of these file paths are allowing the project to compile. Instead it needs an explicit path name including the drive letter:

Assembly: AssemblyKeyFile("E:\VMR\DAL\DataAccessLayer.snk")

Unfortunately, I cannot impose that every developer keeps their source code on the same drive letter on their machines. The projects must support being installed onto various drive letters.

Firstly I cannot understand why a file path will work correctly on one machine and not another - and I have ensured that all the files etc. are in place as they should be.

So, unless there's some dumb user option I'm missing here, does anyone know why .NET behaves differently like this? Can I make it work 100% of the time without specifying a drive letter?

Nick Parker21-Nov-03 3:18

Nick Parker

21-Nov-03 3:18

Martin Cross wrote:
So, unless there's some dumb user option I'm missing here, does anyone know why .NET behaves differently like this? Can I make it work 100% of the time without specifying a drive letter?

Just a thought, but why not always map to the UNC path (this way it's the same for every developer), who cares what drive letter any of your developers map to a network share, that could always change per developer as you are noting. In this case, there is even an article on CP to help with UNC paths: Network Shares and UNC paths[^].

P.S. - I'm sure Heath will respond to this eventually, I give him an hour or two. Wink | ;)

-Nick Parker
DeveloperNotes.com

Martin Cross21-Nov-03 3:45

Martin Cross

21-Nov-03 3:45

Network shares aren't the solution. A lot of us grab the latest version onto laptops and work from home using disconnected checkouts (dangerous I know).

So, am I not the only one where the file paths are a bit iffy then?

Heath Stewart21-Nov-03 3:54

21-Nov-03 3:54

Simple: don't use files. Instead of using the AssemblyKeyFileAttribute use the AssemblyKeyNameAttribute. Import the key pair into a key container using sn -i KeyFile.snk MyCompany and then specify "MyCompany" (or whatever, so long as it matches) as the sole parameter to the latter attribute's constructor. You only need to do this once.

The only thing that isn't documented is whether the key container must exist as a machine container or a user container. It probably doesn't matter, but just a heads-up.

For a brief description, see my article: Using XML Digital Signatures for Application Licensing[^]. The articles not about your problem, but the solution is discussed a little (about key containers, that is).

How to avoid menu on RMouse button

Martin Cross21-Nov-03 4:31

Martin Cross

21-Nov-03 4:31

Good grief man! That's beautiful. Blush | :O

Thanks < bows down as he backs away slowly >

A.Wegierski20-Nov-03 20:38

A.Wegierski

20-Nov-03 20:38

I use right mouse button to open next form in overridden OnMouseDown() method in overridden DataGrid (standard DataGrid works ok). Before this, automatic menu (copy, paste etc.) is opened - while creating new form. How to avoid it? Only OnKey...() has Handled property - but OnKey isn't fired.

-or-
How to add my item to automatic menu (copy, paste etc.)?
Thx in advance.

Hi,
AW

Re: How to avoid menu on RMouse button

Heath Stewart21-Nov-03 3:58

Re: How to avoid menu on RMouse button

21-Nov-03 3:58

I'm not sure I quite follow, but if you want to change the default context menu, this is a bit tricky and not always possible. Instead, you could create your own ContextMenu (drag one from the Toolbox and design it like any other menu) and assign that to the DataGrid.ContextMenu property. That will completely replace the default context menu, but for things like Cut, Copy, and Paste, it's not hard to reproduce that functionality.

You can get the current cell from DataGrid.CurrentCell then cut or copy that text, or replace or append the text with your own paste handler.

A.Wegierski21-Nov-03 17:44

A.Wegierski

21-Nov-03 17:44

It's right. But I thought, that someone could solve this problem in simpler way. Thx.

Hi,
AW

Re: How to avoid menu on RMouse button

Heath Stewart22-Nov-03 11:14

22-Nov-03 11:14

Not everything you need is exposed in .NET because the framework would be huge! This isn't a hard solution, either.

Blobbing

MitchDG20-Nov-03 20:15

MitchDG

20-Nov-03 20:15

I have been sitting with a blob issue for the last day or so now. I am inserting a < 8k blob (image) into my MSSQL database from a OpenDialog Box, which I then from the database try and display in a PictureBox.

This is not working, purely becuase no matter what I do I keep on getting a "System Error" which makes no sense... I stream the image in and stream it out... into the picturebox. Anyone have any thoughts? Help?

Stitch

Re: Blobbing

MitchDG20-Nov-03 21:43

MitchDG

20-Nov-03 21:43

I got this working... thanx

socket listening error

jtmtv1820-Nov-03 17:21

20-Nov-03 17:21

i had wrote a set of class's for sending serialized objects over the net using sockets not to long ago..it worked perfectly then. I wrote a few programs (chat/file sharing) using the classes and they also worked perfectly. Just tonight i went back to use it agian with some new idea's and i have noticed i cant get my sockets to listen all of a sudden. i traced the error down to when the socket calls BeginAccept (the listening socket which is already done doing the setup to be in the listening state). I dont know if this is a code problem because i know for sure i havent touched the code when i used it, i just used the compiled dll's.I tryed uninstalling my old fire wall to see if thats the problem *zone alarm* but it didnt seem to fix it. The sending portion seems to work but the error only lies when i try to call begin accept intialy, This happens so when a connection does come in it is ready to accept it.here is the code with the error.

<br />
IPEndPoint ipe = new IPEndPoint(GetMachineIPAddress(),39888);<br />
					MainListener= new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);<br />
					MainListener.Bind(ipe);<br />
					MainListener.Listen(300);<br />
					Thread.Sleep(10);<br />
//code excutes fine until the line below. which locks the thread indefinitly.<br />
					MainListener.BeginAccept(new AsyncCallback(MainListenerBeginAccept),MainListener);				<br />

if anyone wants to see the full code i would send it...its large and uses compression/serializing/encryption/ect/bla bla bla.

thanks alot for your help with this.

Jesse M

The Code Project Is Your Friend...

Ronny Andersson21-Nov-03 1:12

Ronny Andersson

21-Nov-03 1:12

do you call EndAccept in your AcyncCallBack method? Something like this:

private void MainListenerBeginAccept(IAsyncResult asyncresult)
{
    Socket s = (Socket)ar.AsyncState;
    Socket s2 = s.EndAccept(ar);
    // use s2 to communicate with client.
}

Note I haven't tried it out, so it may or may not work. If you like I can have a look at your MainListenerBeginAccept method.

Ronny Andersson

jtmtv1821-Nov-03 8:08

21-Nov-03 8:08

yeah i do....here is the method i use. try running the code in junction with this and see if it works...

private void MainListenerBeginAccept(IAsyncResult e)
{
try
{
//MessageBox.Show("Acception connection");
Socket main = (Socket)e.AsyncState;
Socket secondary = main.EndAccept(e);
if(secondary!=null)
{
StateObject tr = new StateObject();
//MessageBox.Show(secondary.Available.ToString()+" ava");
tr.buffer = new byte[bufferSize];
tr.MainSocket = main;
tr.socket = secondary;
//
//Console.WriteLine("Beging To Accept");
//
SocketsConnected.Add(secondary);
//
//secondary.BeginReceive(tr.buffer,0,tr.buffer.Length,SocketFlags.None,new AsyncCallback(PendingConnectionReveive),tr);
}
MainListener.BeginAccept(new AsyncCallback(MainListenerBeginAccept),MainListener);
}
catch(System.ObjectDisposedException){}
catch(Exception ex)
{

OnError(this,ex);
}
}

The Code Project Is Your Friend...

Ronny Andersson22-Nov-03 1:41

Ronny Andersson

22-Nov-03 1:41

I wrote a small test prog this morning just for fun. It is a very primitive
and small webserver it only sends a greeting back to the webbrowser.
Try it out locally on your machine with a webbrowser, then try it out
with between two machines. Try changing the port from 80 to something else
(I marked the line in red bold in the code) and try calling it again
if it doesn't work I agree with you it might be a firewall problem.
I've only got one PC at home so I cannot test it between two PCs.
God Luck

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace TestSocket
{
    class MiniWebServer
    {	
        public static void OnAcceptConnection(IAsyncResult ar)
        {
            Socket serverSock = (Socket)ar.AsyncState;
            Socket clientSocket = serverSock.EndAccept(ar);
            try
            {
                serverSock.BeginAccept(new AsyncCallback(MiniWebServer.OnAcceptConnection),serverSock);
                ClientStateObject cso = new ClientStateObject();
                cso.worksocket = clientSocket;
                clientSocket.BeginReceive(cso.buffer, 0, 256, SocketFlags.None, 
                new AsyncCallback(MiniWebServer.OnDataReceived), cso);
            }
            catch(Exception e)
            {
                serverSock.Close();
                Console.WriteLine(e.ToString());
            }
        }

        public static void OnDataReceived(IAsyncResult ar)
        {
            ClientStateObject cso = (ClientStateObject)ar.AsyncState;
            try
            {
                int read = cso.worksocket.EndReceive(ar);
                Console.WriteLine(Encoding.ASCII.GetString(cso.buffer,0,read).ToString());
                if(read == 256)
                {
                    cso.worksocket.BeginReceive(cso.buffer,0,256,SocketFlags.None,
                        new AsyncCallback(MiniWebServer.OnDataReceived), cso);
                }
                else
                {
                    cso.buffer = Encoding.ASCII.GetBytes("<html><body>Hello from the MiniWebServer</body></html>");
                    cso.worksocket.BeginSend(cso.buffer, 0, cso.buffer.Length, SocketFlags.None, 
                    new AsyncCallback(OnDataSent), cso);
                }
            }
            catch(Exception e)
            {
                cso.worksocket.Close();
                Console.WriteLine(e.ToString());
            }
       }

       public static void OnDataSent(IAsyncResult ar)
       {
           ClientStateObject cso = (ClientStateObject)ar.AsyncState;
           try
           {
               int sent = cso.worksocket.EndSend(ar);
           }
           catch(Exception e)
           {
               Console.WriteLine(e.ToString());
           }
           finally
           {
               cso.worksocket.Close();
           }
        }

        [STAThread]
        static void Main(string[] args)
        {
            Socket serverSock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            <code>IPEndPoint endPoint = new IPEndPoint(0,80);</code>
            serverSock.Bind(endPoint);
            serverSock.Listen(1000);

            serverSock.BeginAccept(new AsyncCallback(MiniWebServer.OnAcceptConnection),serverSock);
            Console.ReadLine();
        }

        private class ClientStateObject
        {
            public Socket worksocket;
            public byte[] buffer = new byte[256];
        }
    }
}

Ronny Andersson
www.codelive.com

jtmtv1822-Nov-03 3:02

22-Nov-03 3:02

i think it might be something my firewall because i cant even get a response out of this line of code

serverSock.BeginAccept(new AsyncCallback(MiniWebServer.OnAcceptConnection),serverSock);

it locks the program up every single time. i also noticed something strange...i like to seed my Random class with the current time..so i pass in this

Random rn = new Random((int)DateTime.Now.Ticks);

but every time i ran the code line above it would throw a stack overflow exception. I also tryed uninstalling / disabling the firewall and it didnt seem to do anything.Should i try reinstalling the framework or something ? any ideas ?

The Code Project Is Your Friend...

jtmtv1822-Nov-03 3:10