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I need the total elapsed time of "Idle" to calculate % cpu usage per process. WMI & performance counters are too slow because of their thread.sleep(1000) requirement.
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Try opening a command window and type tasklist /? to get all the options.
You'll find that there is /NH to remove the column headers and /FO CSV to dump the output in comma separated value format.
The output from "tasklist /v /nh /fo csv" will be something like this:
"System Idle Process","0","Console","0","28 K","Running","NT AUTHORITY\SYSTEM","71:33:38","N/A"
"System","4","Console","0","256 K","Running","NT AUTHORITY\SYSTEM","0:24:32","N/A"
"smss.exe","1680","Console","0","924 K","Running","NT AUTHORITY\SYSTEM","0:00:00","N/A"
It will be advantageous to capture the output as lines rather than one long string. For this use ReadLine in a loop instead of ReadToEnd.
The final step is subdivision of each line at the comma delimiters to get the individual fields (use the String.Split method).
Alan
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Excellent!
The difficult we do right away...
...the impossible takes slightly longer.
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Hi Alan,
Nice catch on the /nh /fo /csv thing.
Quick question though...
How would you suggest trimming the '"' quote marks from the values & given that you can't split on ',' commas because e.g. "csrss.exe","996","Console","0","7,372 K" (the comma in the memory component 7,732K) would cause a problem.
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Hi Luc, gee thanks...didn't know you cared...
The issue is that if you run
Process p = new Process();
p.StartInfo = new ProcessStartInfo("tasklist");
p.StartInfo.Arguments = " /v /nh /fo csv";
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.UseShellExecute = false;
p.Start();
while (true)
{
string o = p.StandardOutput.ReadLine();
if (!string.IsNullOrEmpty(o))
{
string [] s = o.Split(',');
Console.WriteLine(o);
Console.ReadLine();
}
}
occasionally, you only get the last 2 values of the first line. Also, you can't do this
Console.WriteLine(a.Remove(0,1).Remove(a.Length -1,1)); without an exception 'System.ArgumentOutOfRangeException: Index and count must refer to a location within the string. Parameter name: count' which doesn't make much sense because if:-
string s = "bob";
s = s.Remove(s.length -1,1)
result = bo
why is Remove(a.Length -1,1) causing an exception?
Could anyone make any (relevant) suggestions...
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CCodeNewbie wrote: Console.WriteLine(a.Remove(0,1).Remove(a.Length -1,1));
It is way better to write 5 simple lines you understand, than one complex one you think you understand but you don't.
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There are a few things I don't understand with this.
Why does this...
string o = p.StandardOutput.ReadLine();
o = o.Replace("\n", string.Empty);
if (!string.IsNullOrEmpty(o))
{
Console.WriteLine(o);
}
...which gives me...
"System Idle Process","0","Console","0","28 K","Running","NT AUTHORITY\SYSTEM","46:49:36","N/A"
work perfectly, but this...
string o = p.StandardOutput.ReadLine();
o = o.Replace("\n", string.Empty);
if (!string.IsNullOrEmpty(o))
{
string [] s = o.Split(',');
string a = s[0];
string b = s[1];
string c = s[2];
Console.WriteLine(a + b + c);
}
give me a flashing cursor and when I hit enter I get...
"System""4""Console"
where has "System Idle Process" gone?...
and despite having this...
if (!string.IsNullOrEmpty(o))
I still get-
System.NullReferenceException: Object reference not set to an instance of an object.
Aargh!!!
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CCodeNewbie wrote: and despite having this...
if (!string.IsNullOrEmpty(o))
I still get-
System.NullReferenceException: Object reference not set to an instance of an object.
..you're not getting the exception on that particular line, are you?
if (!string.IsNullOrEmpty(null))
This is allowed, and doesn't result in an exception.
It helps if you chop your function up into smaller bits. That way you'll also be looking at less code when there's a failure.
You might also want to dump the entire exception to the console;
try
{
}
catch(Exception e)
{
Console.WriteLine(e.ToString());
}
The exception will tell you which line blew up.
..and as someone else mentioned in this thread, it's easier to write a lot of simple statements than to maintain a single complex one.
Bastard Programmer from Hell 
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That's the irritating part, it doesn't blow up. It just outputs only part of the first line.
just ran it, worked perfectly. ran it again & got Quote: "81:15:36","N/A"
as the first line..
Quote: You might also want to dump the entire exception to the console;
I always put everything inside try..catch, I am not experienced enough to be able to accurately predict what the code is going to do.
try
{
Process p = new Process();
p.StartInfo = new ProcessStartInfo("tasklist");
p.StartInfo.Arguments = " /v /nh /fo csv";
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.UseShellExecute = false;
p.Start();
while (true)
{
string o = p.StandardOutput.ReadLine();
if (!string.IsNullOrEmpty(o))
{
Console.WriteLine(o);
string[] s = o.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
string a = s[0];
string b = s[1];
string c = s[2];
Console.WriteLine(a + " : " + b + " : " + c);
Console.ReadLine();
}
}
}
catch (Exception se)
{
Console.WriteLine(se.ToString());
Console.ReadLine();
}
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ran it again and got
81:33:06","N/A"
"System Idle Process" : "0" : "Console"
WT? Could it be that "while (true)" is exiting properly? I am noticing that the Console window doesn't close after the last Readline().
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An illustration of what I mean:-
string o = p.StandardOutput.ReadLine();
if (!string.IsNullOrEmpty(o))
{
string[] s = o.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
string a = s[0];
string b = s[1];
string c = s[2];
Console.WriteLine(o);
Console.WriteLine(a + " : " + b + " : " + c);
Console.ReadLine();
}
results in
"System Idle Process","0","Console","0","28 K","Running","NT AUTHORITY\SYSTEM","64:59:34","N/A"
"System","4","Console","0","264 K","Running","NT AUTHORITY\SYSTEM","0:11:53","N/A"
"System" : "4" : "Console"
Why is there no entry under the "System Idle Process" like the bolded entry under "System"?
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I found this link:
http://www.dreamincode.net/forums/topic/152297-c%23-log-in-to-website-programmatically/
and it kinda shows how to log into a twitter account. Im trying to do
the same thing to a yahoo account or godaddy account or anything else
just to understand this more.
Can anyone show me how to log into something like yahoo or godaddy or
something else other than twitter? Please any response any one can
give me will be greatly appreciated.
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i use this code
SqlCommand cmd1 = new SqlCommand("insert into '" + comboBox6.SelectedItem.ToString() + "' (name,address,telephone,website,email,info,place_id,cor_x,cor_y)values(" + "'" + textBox_name.Text + "','" + textBox_address.Text + "','" + textBox_telephone.Text + "','" + textBox_website.Text + "','" + textBox_email.Text + "','" + richTextBox_info.Text + "' , select id from places where name= '"+ comboBox6.SelectedItem.ToString() +"','" + textBox_corx.Text + "','" + textBox_cory.Text + "') ", con);
and this error showed
Incorrect syntax near the keyword 'select'.
Incorrect syntax near ','.
what should i do ?
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I don't know, but that would be easier to read if you used String.Format and a parameterized query (which you should do anyway).
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I don't think you want single quotes around your table name on the 'insert' command.
Jack of all trades ~ Master of none.
modified 6-Apr-12 20:25pm.
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I would use two SQL statements, one to get the place ID from its name, then the big insert which needs the result of the former statement.
And I would:
- never publish code in a proportional font (they invented PRE tags to get readable code here);
- not build such complex statements; why not building a string first, so you can see it, log it, whatever;
- not take user input without validating it;
- use SqlParameters.
And finally you could consider creating a stored procedure to do this.
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Presently working with C# programming book and using Visual Studio 2008 Tem Suite. One exercise requires that I insert the text:
MessageBox.Show ("Contact List 1.0. \nWritten by: Your Name", "About");
Although I have done this once successfully, I have not been able to repeat because the text within the parentheses is now shown in RED. The message box appears containing the notification "ClassSystem.String Represents text as a series of Unicode characters"
I am a novice and have tried to search this but have not found information to correct this issue. Guidance sought
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mauricemcse wrote: MessageBox.Show ("Contact List 1.0. \nWritten by: Your Name", "About");
There is nothing wrong with this code.
mauricemcse wrote: I have not been able to repeat because the text within the parentheses is now
shown in RED.
It's red by default. It's called "syntax coloring" so you can easily see that the item is a string. If you do not like the red color, you can change it from your Tools->Options menu item.
Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Please stand in front of my pistol, smile and wait for the flash - JSOP 2012
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The text being shown in red is just Visual Studio's way of telling you that it is a literal string. MessageBox is a light blue because it's a class. Show is black because it's a function, and so on.
The "Class System.String..." message that appears when you hold the mouse pointer over it is Visual Studio telling you about Strings. If you hold the mouse over MessageBox or over Show you will see other helpful messages about them.
What issue is it that you are trying to correct?
BDF
I often make very large prints from unexposed film, and every one of them turns out to be a picture of myself as I once dreamed I would be.
-- BillWoodruff
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The first attempt at the code insertion did not demonstrate a red font and so when the exercise was repeated I assumed the red font was an indication of a problem. I have visited other forums where such queries are met with hostility or ridicule. I am truly appreciative of the responses I get here.
Cordially,
mauriceMCSE
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Depends on the question here -- and timing.
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It's strange that the first attempt wasn't colored red. Best not to waste time trying to figure out why not, I suppose. I wish you success in your future coding exercises.
BDF
I often make very large prints from unexposed film, and every one of them turns out to be a picture of myself as I once dreamed I would be.
-- BillWoodruff
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As mentioned, these are the default colors for the text editor. You can always change and customize these colors as described here[^].
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Hi,
In my class library project, I have class1 and class2.
I difined both of them as public and tried to access class2 functions in class1 by creating objects. When I expose this library project dll to other test project, I would like to restrict access to class2. Pls guide me. Thanks in advance
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