C# Discussion Boards - CodeProject

manojk_batra4-Oct-05 6:32

4-Oct-05 6:32

Dear All,

I want to check the CPU Usage in C#. May be through Perfprmance counters?? Can I get sample code for that.

With Regards
Manoj

Re: CPU Usage

Heath Stewart4-Oct-05 10:53

Heath Stewart

4-Oct-05 10:53

What type of CPU usage you want to check is important. You can browse the various performance counters and read their descriptions using the Server Explorer tab in Visual Studio - right-clicking on the perf counter you want and select Properties - or use perfmon.exe o NT-based Windows OSes.

An example of just getting values every .5 seconds follows:

using System;
using System.Diagnostics;
using System.Threading;
 
class Usage
{
  static void Main()
  {
    using (PerformanceCounter pc = new PerformanceCounter())
    {
      // Use a specific counter for all CPUs.
      pc.CategoryName = "Processor";
      pc.CounterName = "% User Time";
      pc.InstanceName = "_Total";
 
      Console.Error.WriteLine("Total % User Time:");
      Console.Error.WriteLine("Press any key to exit...");
 
      ThreadPool.QueueUserWorkItem(new WaitCallback(Count), pc);
      Console.Read();
 
      Console.Error.WriteLine("Done");
    }
  }
 
  static void Count(object state)
  {
    PerformanceCounter pc = state as PerformanceCounter;
    while (pc != null)
    {
      Console.WriteLine("{0,3:f2}%", pc.NextValue());
      Thread.Sleep(500);
    }
  }
}

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft

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Re: CPU Usage

manojk_batra4-Oct-05 18:04

manojk_batra

4-Oct-05 18:04

Thanks you lot.

Actually I want to implement cluster. in which I want to check CPU Usage before assigning it to computation.

With Regards
Manoj

Re: CPU Usage

Heath Stewart5-Oct-05 6:47

Heath Stewart

5-Oct-05 6:47

You can still use the performance counters and should consider taking a brief running average before giving more work to a CPU. CPU usage goes up and down and performance counters only have so much resolution between ticks (no where near as fast as a CPU tick).

There is actually APIS for clustering in Windows available either as automation objects (which you can use with a Runtime-Callable Wrapper (RCW) created by tlbimp.exe) or native functions you can P/Invoke. See http://msdn.microsoft.com/library/en-us/mscs/mscs/windows_clustering.asp[^] for details.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Customer Product-lifecycle Experience
Microsoft

[My Articles] [My Blog]

Displaying an owned form when main form is shown

Luis Alonso Ramos4-Oct-05 5:11

Luis Alonso Ramos

4-Oct-05 5:11

Hello,

I have an MDI application. At the start of Main I call EnableVisualStyles and DoEvents to enable XP theming and everything works fine.

But now, I'm trying to automatically simulate a click event for a menu item to display a login form on top of that MDI parent.

First I tried to display the form the first time the Activated event is fired for the MDI parent, and it kind of works, but the main form is displayed partially resized (titlebar is resized to saved position, but not client area) and only totally paints itself after the login form is closed.

I have a timer, so I tried setting a flag and displaying the form the first time the Tick event fires for the timer, before clearing the flag. This to wait for the form to process all the creation events. And it works perfect, except that I don't get visual styles in any of my application's dialogs (but I do in toolbars and message boxes.)

I'm using .NET 1.1 (VS 2003) on Windows XP.

So, any ideas?

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

Solved!

Luis Alonso Ramos4-Oct-05 5:42

Luis Alonso Ramos

4-Oct-05 5:42

I just removed the calls to EnableVisualStyles and DoEvents and added an app.manifest file. Everything works great now! Smile | :)

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

Re: Displaying an owned form when main form is shown

mav.northwind4-Oct-05 7:07

mav.northwind

4-Oct-05 7:07

Hi!

You could also try using the Application.Idle event instead of your timer. That way the menu item click is simulated when the application is finished initializing the main form.

Regards,
mav

Remoting URI question ?

Member 127995794-Oct-05 5:10

Member 12799579

4-Oct-05 5:10

I am new to remoting and have created 3 projects on the same machine

1) Server object
2) Server activation object
3) Client

The client calls the server activation object which includes specifying a URI to show where the Server activation application resides. This client code might look something like this...

TcpClientChannel ch = new TcpClientChannel();
ChannelServices.RegisterChannel(ch);

RemotingConfiguration.RegisterWellKnownClientType(
typeof(SAO_server_single_call.clsSAO_singlecall),
"tcp:davelaptop:1234/clsSAO_singlecall");

objSAO_singlecall = new SAO_server_single_call.clsSAO_singlecall();

Can anybody tell me how to work out how the URI should be constructed? I've not used them much before. My computer is called 'davelaptop' and the client activation server project lives at 'D:\Work\Exercise\RemotingTest\RemotingTest\TestServer'

Can anyone tell me what the URI should look like or tell me where I'm going wrong?

Thanks in advance - Dave

Re: Remoting URI question ?

S. Senthil Kumar4-Oct-05 6:07

S. Senthil Kumar

4-Oct-05 6:07

The URI doesn't have anything to do with the physical location of the server. You only need to provide the port number of the channel which you registered on the server. For example, if your server code looked like this

ChannelServices.RegisterChannel(new TcpChannel(8082));
RemotingConfiguration.ApplicationName = "HelloServiceApplication";
RemotingConfiguration.RegisterWellKnownServiceType( typeof(HelloService),
                                                            "MyUri",
                                                         WellKnownObjectMode.SingleCall 
                                                          );

Then the client call will look like

RemotingConfiguration.RegisterWellKnownClientType(
typeof(SAO_server_single_call.clsSAO_singlecall),
"tcp://localhost:8082/HelloServiceApplication/MyUri");

Quoted from MSDN[^]

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Autocompletion

PaulaM4-Oct-05 5:07

PaulaM

4-Oct-05 5:07

im using visual studio beta 2
i have richtextbox and listbox in my C# windows application.
my application works like intellisense/Autocomplete like typing System, then a "."
inside Visual Studio .NET will show a drop down list of types for the System namespace.
when i type a recognized word into the richtextbox then a period/fullstop,
a listbox appears.

problem:
how do i position my listbox to appear right after the period('.') i would have typed in my richtextbox

code example would be appreciated

thanks Smile | :)

regards paula

Re: Autocompletion

Daniel Grunwald4-Oct-05 5:54

Daniel Grunwald

4-Oct-05 5:54

listBox.Location = richTextBox.GetPositionFromCharIndex(richTextBox.SelectionStart);

wav file + c#

g00fyman4-Oct-05 3:26

g00fyman

4-Oct-05 3:26

how do i play short wav file in c# then stop when it finishes.

i have a timer that will fire when a remote server goes offline, the timer_tick fires every 10000 millisec, and the wav file is 1.5 secs long.

when i use the code below and play synchronisly it just repeats continouslyand seems to stall the form, as i cant click the button to shut it up Frown | :(

if i play it asynchronously, then it plays over the top of itself repeatedly Frown | :(

how can i just play it one every 10 seconds until i cancel it ?

<br />
if(online)<br />
      {<br />
        this.stationStatus.Text = "ONLINE";<br />
        this.stationStatusPicture.Image = this.statusImages.Images[0];<br />
      }<br />
      else<br />
      {<br />
        this.recogniseAlertButton.Visible = true;<br />
<br />
        offlineTimer = new Timer();<br />
        offlineTimer.Interval = 10000;<br />
        offlineTimer.Tick += new EventHandler(offlineTimer_Tick);<br />
        offlineTimer.Start();<br />
      }  <br />
<br />
WSounds ws;<br />
    private void offlineTimer_Tick(object sender, EventArgs e)<br />
    {<br />
      ws = new WSounds();<br />
       <br />
      try<br />
      {<br />
        ws.Play("offline.wav", ws.SND_FILENAME/*|ws.SND_ASYNC*/);<br />
<br />
        this.stationStatus.Text = "OFFLINE";<br />
        this.stationStatusPicture.Image = this.statusImages.Images[1];<br />
      }<br />
      catch(IOException ioe)<br />
      {<br />
        Debug.WriteLine(ioe.Message);<br />
      }<br />
    }<br />
<br />
public class WSounds<br />
  {<br />
    [DllImport("WinMM.dll")]<br />
    public static extern bool  PlaySound(string fname, int Mod, int flag);<br />
<br />
    // these are the SoundFlags we are using more in mmsystem.h<br />
    public int SND_ASYNC    = 0x0001;     // play asynchronously<br />
    public int SND_FILENAME = 0x00020000; // use file name<br />
    public int SND_PURGE    = 0x0040;     // purge non-static events<br />
<br />
    public void Play(string fname, int SoundFlags)<br />
    {<br />
      PlaySound(fname, 0, SoundFlags);<br />
    }<br />
<br />
    public void StopPlay()<br />
    {<br />
      PlaySound(null, 0, SND_PURGE);<br />
    }<br />
  }<br />

kid regards,
g00fy

handling table SQL in 1 class?

mpw_4-Oct-05 2:34

mpw_

4-Oct-05 2:34

How is SQL generally handled? I'm building my first application for windows using c# and have just finished up the base class for the application forms to inherit from.

Next, I'm wondering how to handle the SQL (connection, selects, inserts, updates, deletes) and wondering if these should all go into there own class. One class per table or something like that as opposed to having each form use it's own set of SQL. ex: Customer form loads a grid using customer table. Customer search populates a listbox from customer table and displays this in a dialog. Customer edit takes an existing record (or allows the creation of a new record). 3 seperate forms. Should 1 class handle the customer SQL or would you handle that individually in each of the 3 forms? (frmGrid, frmSearch, frmEdit) I'm concerned that if anything changes (and it probably will) within the table, I'd need to search through each form that uses that table to handle mod's.

Thanks for any guidance you can offer!

Re: handling table SQL in 1 class?

Wjousts4-Oct-05 3:26

Wjousts

4-Oct-05 3:26

I usually put all my database handling into one class and have any forms that need to access the database keep a reference to that class. I have my database class manage the connection, all the different data adapters and all the data tables.

Re: handling table SQL in 1 class?

mpw_4-Oct-05 3:45

mpw_

4-Oct-05 3:45

Excellent and thank you for such a quick response. I'll start in on this today!

Re: handling table SQL in 1 class?

g00fyman4-Oct-05 3:31

g00fyman

4-Oct-05 3:31

ORM.NET and you won't look back

find it here

regs,
g00fy

Re: handling table SQL in 1 class?

mpw_4-Oct-05 4:11

mpw_

4-Oct-05 4:11

Awesome link. I'm not familiar with ORM, so I've bookmarked that URL and will give it a read!

Thanks

Form Inheritance

PHDENG814-Oct-05 2:08

PHDENG81

4-Oct-05 2:08

I have a project with a main form that accesses inherited forms with their appropriate .dll's. I have several that work fine. However, the latest form gives me the following error when I try to compile the main form:

" "_Form() is inaccessible due to its protection level

I understand what it is saying. I just dont see why. I am able to compile and run the inherited form separately with no problem. However, once I call it from my main form, I receive the previous error. Any help would be much appreciated. Thanks.

D

Re: Form Inheritance

spif20014-Oct-05 2:10

spif2001

4-Oct-05 2:10

Is the _Form declared as protected instead of public as it should be?

I'm in the high-fidelity first class traveling set.
And I think I need a Lear jet.

Re: Form Inheritance

PHDENG814-Oct-05 2:21

PHDENG81

4-Oct-05 2:21

spif,

Thanks for the quick response. However, the form is declared as public. public _Form(){}

Any other ideas? I am assuming it isn't a user control because it would give me this error when I run the application stand-alone. What could it be?

D

Re: Form Inheritance

PHDENG814-Oct-05 2:31

PHDENG81

4-Oct-05 2:31

spif,

Thanks again for your help. You got me going in the right direction. The form was declared null within the protected override void dispose method. Thanks again for everything.

Re: Form Inheritance

spif20014-Oct-05 2:32

spif2001

4-Oct-05 2:32

Try to write the whole namespace in front of the initialization.

ex.

System.Windows.Forms.Form f = new System.Windows.Forms.Form();

^^replace with the _Form's namespace.

There may be another Form with same name which is inaccesable (private or protected)

I'm in the high-fidelity first class traveling set.
And I think I need a Lear jet.

hi all

magnifique4-Oct-05 1:44

magnifique

4-Oct-05 1:44

how can i import data from any access,oracle dbase to sql server

Re: hi all

Guffa4-Oct-05 2:06

Guffa

4-Oct-05 2:06

Using DTS.

---
b { font-weight: normal; }

Deriving a class variable from a string

MrEyes4-Oct-05 1:39

MrEyes

4-Oct-05 1:39

I have to admit its an odd thread title, but it almost describes what I want to do.

Let say I have the following class

class Duck
{
 public string name;
 public int age;
 public bool isMale;
}

I need to be able to access these class vars from strings. Lets say I have the following instance of the Duck class

Duck myDuck = new Duck();
myDuck.name = "fred";
myDuck.age = "2";
myDuck.isMale = false;

Elsewhere in the code I have the following strings, and I need to use these strings to access the member variables of the myDuck instance. I know this could be done with if/else/switch etc but I am curious to learn if there is a way to do this with less code.

string varName_DuckName = "name";
int varName_DuckAge = "age";
bool varName_duckIsMale = "isMale";

And example (ish) of what I want to do already exists in the .NET framework for the Color class where you can call:

Color.FromName("red")

So I would like to be able to do something like

bool b = (bool)myDuck.FromName("isMale")

Which is the case of the example above would set b as false

post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42

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