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Class Library Delegate Event Passing To Another Executable?

Posted on 2012-12-28
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Last Modified: 2013-01-12
Me again, this time building a Class Library with a  Delegate and Event which I would like to pass it's Status to Form1 in another executable. Here's what I have so far, it doesn't error, just doesnt' show in the Form1 textbox. I'm guessing it's a threading issue.

Note: the 'FtpClientStatusEventHandler' and event works within it's own project.

My ultimate goal is to pass status messages from my .dll class library to any subscribing exe or possibly another .dll

[.dll]
namespace FtpClientManager
{
    public delegate void FtpClientStatusEventHandler(string statusMessage);

    public interface IFtpClient
    {        
        event FtpClientStatusEventHandler StatusMessage;
     }
}  

[.exe]
using FtpClientManager;

 public partial class Form1 : Form
 {
        IFtpClient ftpClient = new FtpClient();

        public Form1()
        {
            InitializeComponent();
         
            ftpClient.StatusMessage += new FtpClientStatusEventHandler(ftpClient_StatusMessage);
        }

 void ftpClient_StatusMessage(string statusMessage)
        {
            if (textBox2.InvokeRequired)
            {
                textBox2.Invoke((MethodInvoker)delegate { textBox2.Text = textBox2.Text + "\n\n" + statusMessage; });
            }
            else
            {
                textBox2.Text = textBox2.Text + "\n\n" + statusMessage;
            }
        }
}
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Question by:pointeman
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8 Comments
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 38728826
try using like this
 void ftpClient_StatusMessage(string statusMessage)
        {
                textBox2.Text = textBox2.Text + "\n\n" + statusMessage;
        }

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0
 

Author Comment

by:pointeman
ID: 38732473
1. I run a debugger and no message is getting to the 'statusMessage'.
2. No errors, just not showing message.
3. I have referenced the .dll correctly like so:

using FtpClientManager;

public partial class Form1 : Form
    {     
        IFtpClient ftpClient = new FtpClient();

        public Form1()
        {
            InitializeComponent();

            ftpClient.StatusMessage += new FtpClientStatusEventHandler([b]ftpClient_StatusMessage[/b]); //is active on Form1 load
        }

void ftpClient_StatusMessage(string [b]statusMessage[/b]) // no message here
        {
            textBox2.Text = textBox2.Text + "\n\n" + statusMessage;
        }
      

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LVL 19

Accepted Solution

by:
Melih SARICA earned 500 total points
ID: 38735917
Are u sure that dll ftpclient Sending  Status messages  ?
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Author Comment

by:pointeman
ID: 38747414
Yes, because it works within a Desktop app.
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 38749080
Are u sure ur handling the correct event? There can be something to handle that event. or Insome cases i saw that u must set a percentange for the client to triggered event.
0
 

Author Comment

by:pointeman
ID: 38750444
Well then can you write some code to make your point?
0
 
LVL 19

Expert Comment

by:Melih SARICA
ID: 38751234
Do u ave ur FTP client's Soucer Code ? The DLL one..
If not.. if its a Shareware or freeware what is ur DLL FTP Clients Name..
0
 

Author Closing Comment

by:pointeman
ID: 38770924
The FTP client code is running synchronous and blocking, so the message delegate is not working.
0

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