Run Thread when form open.Plz urgent.

[abid gee]

Please give a kind look on my question. and please comments.

I am Using C# as development tool of Dot Net 2.0.
I wrote a function read_data() that read data from Serial Port
continuously.Till application gets close.
But When Form loaded read_data() function take tooo much CPU. Even I can
not see Application controls.
Some body told me, Use Threading.



I need your help. I have used Thread just for study purpose. Not for
Professional application.

(I used in Main () function for a dummy application.)



But i don't know how to implement Threads, When a Form gets load?



I would be grateful if you would just mention frew lines.

That supports/give me hint...





Sincerely,





Mr. Khurram Nazir.

 

[Morten Wennevik [C# MVP]]

Hi,

Typically in the form's Page_Load event you create a Thread and start it,
keep a handle to this thread since you have to end it when your form
closes. The Thread reads from the serial port and invoke your GUI-thread
when it has data to post. Read Jon Skeet's article on multi-threading and
pay particular attention to page 7 (Threading in Windows Forms).

[Multi-threading in .NET: Introduction and suggestions]
http://www.yoda.arachsys.com/csharp/threads/

 

[John Duval]

Hi Khurram,

Sounds like you have 2 problems:
1) your read_data function is pegging the CPU
2) you are not servicing the message pump on your UI thread (which is
why your UI is not repainting)

To solve #1, you might want to consider putting in a sleep. Hard to
say without knowing what read_data does
To solve #2, you should create a separate "worker" thread for
read_data(), something like this:

private static bool _continue = true;
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

Thread thread = new Thread(Program.read_data);
thread.Start();

Application.Run(new Form1());

_continue = false;
}

private static void read_data()
{
while (_continue)
{
// <put your worker code here>

// you might want to consider sleeping like this if you don't want
to peg the CPU
Thread.Sleep(1000);
}
}

There are some more sophisticated things you can do with inter-thread
communication (e.g. have the main thread tell the other thread to
pause processing, etc...), but this should get you started in the
right direction.

Hope that helps,
John