Develop Reference

Asynchronous Call to Timer

I am trying to create an application that shows the system statistics but it also executes a timer each second to update the current CPU clock speed. I have tried numerous solutions but none seem to work for me. I will attach my code below. I am using the System.Management DLL to call the stats I am wanting. Thank you!
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Management;
namespace ezCPU
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.Text = this.Text + " - v" + Application.ProductVersion;
getCPUInfo();
}
public string convertClockSpeed(string s)
{
double clockSpeed = Convert.ToDouble(s);
double newClockSpeed = (clockSpeed / 1000);
return Math.Round(newClockSpeed, 2).ToString() + " GHz";
}
public void getCPUInfo()
{
ManagementObjectSearcher myProcessorObject = new ManagementObjectSearcher("select * from Win32_Processor");
foreach (ManagementObject obj in myProcessorObject.Get())
{
string cpuName = obj["Name"].ToString();
txtCPUName.Text = cpuName;
string cpuManufacturer = obj["Manufacturer"].ToString();
if (cpuManufacturer == "GenuineIntel")
{
txtCPUManufacturer.Text = "Genuine Intel";
}
else
{
txtCPUManufacturer.Text = cpuManufacturer;
}
string cpuCores = obj["NumberOfCores"].ToString();
txtCores.Text = cpuCores;
string cpuThreads = obj["ThreadCount"].ToString();
txtThreads.Text = cpuThreads;
string cpuMaxSpeed = obj["MaxClockSpeed"].ToString();
txtClockSpeed.Text = convertClockSpeed(cpuMaxSpeed);
}
}
private void cpuTimer_Tick(object sender, EventArgs e)
{
ManagementObjectSearcher myProcessorObject = new ManagementObjectSearcher("select * from Win32_Processor");
foreach(ManagementObject obj in myProcessorObject.Get())
{
string currentClockSpeed = obj["CurrentClockSpeed"].ToString();
txtCPUSpeed.Text = convertClockSpeed(currentClockSpeed);
}
}
}
}
This is the result of the code. However, I am unable to move the form around while it is still updating.

Have you tried the windows forms timer? It has the elapsed event that even spins up a background thread to do the work, keeping your ui responsive:
https://learn.microsoft.com/en-us/dotnet/api/system.timers.timer.elapsed?redirectedfrom=MSDN&view=netframework-4.8
public class Form1: Form
{
public System.Windows.Forms.Timer aTimer = new System.Windows.Forms.Timer();
public Form1()
{
InitializeComponent();
// Create a timer and set a two second interval.
aTimer.Interval = 2000;
// Hook up the tick event for the timer.
aTimer.Tick += OnTimedEvent;
// Have the timer fire repeated events (true is the default)
aTimer.AutoReset = true;
// Start the timer
aTimer.Enabled = true;
Console.WriteLine("Press the Enter key to exit the program at any time... ");
Console.ReadLine();
}
private void OnTimedEvent(object sender, EventArgs e)
{
// update your statistics here
}
}
If you want to update the ui there, then the tick event is the way to go: https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.timer.tick?view=netframework-4.8

disabling a button in c# socket

I have created two buttons in c#. Is there any way to deactivate a button if anything goes wrong in the other button's function. I am giving a sample code fragment. There are two buttons. one is for connect and other is for browse files. I want to disable the browse button if the connectivity fails in the connect button. How to do this?
Sample code fragment:
using System;
using System.Drawing;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Collections.Generic;
class Client:Form
{
public Client()
{
Size = new Size(400, 380);
Button connect = new Button();
connect.Parent = this;
connect.Text = "Connect";
connect.Location = new Point(295, 20);
connect.Size = new Size(6 * Font.Height, 2 * Font.Height);
connect.Click += new EventHandler(ButtonConnectOnClick);
Button browse = new Button();
browse.Parent = this;
browse.Text = "Browse";
browse.Location = new Point(220, 20);
browse.Size = new Size(6 * Font.Height, 2 * Font.Height);
browse.Click += new EventHandler(ButtonbrowseOnClick);
}
void ButtonConnectOnClick(object obj, EventArgs ea)
{
tcpClient = new TcpClient("127.0.0.1", 1234);
}
[STAThread]
public static void Main()
{
Application.Run(new Client());
}
}
Another Question:
Is there any way to reset the button (say, the browse button) activity at a certain time and wait for clicking again?

You can just use a global flag:
bool connectButtonBroken = false;
private void ButtonbrowseOnClick(object sender, EventArgs e)
{
if(!connectButtonBroken)
{
//do code
}
}

Just wrap your connect call in a Try/Catch block and disable the other button in the Catch:
catch (Exception)
{
ButtonConnect.Enabled = false;
}
You should probably re-enable it just before the end of the Try with this:
ButtonConnect.Enabled = true;
You will need to store a reference to your dynamically created Connect button in a variable called ButtonConnect in a form level variable instead of a local one in the constructor for this to work.

Delegate loads the Alert Form but I can't use any of the components.. its stuck

The problem is below. Here's my code...
// Contents of Form1.cs
// Usual includes
namespace ProcessMonitor
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public Boolean getStatus()
{
// Returns true if the system is active
if (label1.Text.Equals("Active"))
return true;
return false;
}
private void button1_Click(object sender, EventArgs e)
{
if(getStatus())
{
label1.Text = "Not Active";
button1.Text = "Activate";
}
else
{
label1.Text = "Active";
button1.Text = "Deactivate";
}
}
private void Form1_Load(object sender, EventArgs e)
{
Monitor mon = new Monitor(this);
mon.Run();
}
}
}
// Contents of Monitor.cs
// Usual includes
using System.Management;
using System.Diagnostics;
using System.Threading;
namespace ProcessMonitor
{
class Monitor
{
Form1 parent;
private void ShowAlert(Alert al)
{
al.Show();
}
public Monitor(Form1 parent)
{
this.parent = parent;
}
public void InvokeMethod()
{
//This function will be on main thread if called by Control.Invoke/Control.BeginInvoke
Alert frm = new Alert(this.parent);
frm.Show();
}
// This method that will be called when the thread is started
public void Run()
{
var query = new WqlEventQuery("__InstanceCreationEvent", new TimeSpan(0, 0, 0, 0, 1),
"TargetInstance isa \"Win32_Process\");
while (true)
{
using (var watcher = new ManagementEventWatcher(query))
{
ManagementBaseObject mo = watcher.WaitForNextEvent();a
//MessageBox.Show("Created process: " + ((ManagementBaseObject)mo["TargetInstance"])["Name"] + ",Path: " + ((ManagementBaseObject)mo["TargetInstance"])["ExecutablePath"]);
ManagementBaseObject o = (ManagementBaseObject)mo["TargetInstance"];
String str = "";
foreach (PropertyData s in o.Properties)
{
str += s.Name + ":" + s.Value + "\n";
}
this.parent.Invoke(new MethodInvoker(InvokeMethod), null);
}
}
}
}
}
Alert.cs is just a blank form with a label that says “new process has started”. I intend to display the name of the process and location, pid, etc. by passing it to this alert form via the Thread (i.e. class Monitor). I have deliberately made the thread load in form_load so that I can resolve this error first. Adding it as a thread properly after the main form loads fully is a later task. I need to fix this first..
The delegate creates the Alert form but I can’t click on it, its just stuck. Need help to solve this.

Your while loop in Run is blocking the UI thread.
by passing it to this alert form via the Thread
You never actually create a new thread or task here - you just run code which executes in the UI thread, and causes an infinite loop. This will prevent the main form, as well as your Alert form, from ever displaying messages.
You need to push this into a background thread in order for it to work, ie:
private void Form1_Load(object sender, EventArgs e)
{
ThreadPool.QueueUserWorkItem(_ =>
{
Monitor mon = new Monitor(this);
mon.Run();
});
}

Windows Form - Running python script, redirected output delayed

I'm running a windows form with a background worker to update a textbox based on the output of a python script. Its all working pretty well, except the redirected output is not in real time; its delayed pretty significantly.
Any ideas how I can increase the redirected outputs response time?
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;
using System.IO;
namespace JiraHeartBeat
{
public partial class Form1 : Form
{
delegate void AppendTextDelegate(string text);
BackgroundWorker Worker = new BackgroundWorker();
public Form1()
{
InitializeComponent();
Worker.DoWork += new DoWorkEventHandler(Worker_DoWork);
Worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);
}
void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
StartButton.PerformClick();
}
private void StartButton_Click(object sender, EventArgs e)
{
if (!Worker.IsBusy)
{
Worker.RunWorkerAsync();
}
}
public void Worker_DoWork(object sender, DoWorkEventArgs e)
{
Process pro = new Process();
pro.StartInfo.RedirectStandardOutput = true;
pro.StartInfo.RedirectStandardError = true;
pro.StartInfo.UseShellExecute = false;
pro.StartInfo.CreateNoWindow = true;
pro.EnableRaisingEvents = true;
pro.OutputDataReceived += new DataReceivedEventHandler(OnDataReceived);
pro.ErrorDataReceived += new DataReceivedEventHandler(OnDataReceived);
pro.StartInfo.FileName = "C:\\Python27\\python.exe";
pro.StartInfo.Arguments = "\"C:\\Python27\\myscript.py\"";
try
{
pro.Start();
pro.BeginOutputReadLine();
pro.BeginErrorReadLine();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
Thread.Sleep(5000 * 60);
}
public void OnDataReceived(object sender, DataReceivedEventArgs e)
{
if (e.Data != null)
{
string temp = (e.Data) + Environment.NewLine;
appendText(temp);
}
}
public void appendText(string text)
{
if (ResultTextBox.InvokeRequired)
{
ResultTextBox.Invoke(new AppendTextDelegate(appendText), new object[] { text });
}
else
{
ResultTextBox.AppendText(text);
}
}
}
}

Actually, the issue is that Python does not redirect output until the script is complete. I believe IronPython will redirect while the script is running (have not tested this though), but unfortunately, regular Python must wait for the script to end before redirecting output.

Try removing the below line from the Worker_DoWork, I suspect it is delaying the execution of the RunWorkerCompleted event.
Thread.Sleep(5000 * 60);
EDIT
Since the above approach was attempted and did not solve the problem entirely I investigated a bit further and confirmed that when capturing the output from a python script the response is delayed. However, by adding a call to sys.stdout.flush() I was able to get the desired behavior. Here is the python script I used which worked successfully in my test.
import time
import sys
for x in xrange(0,11):
print x
time.sleep(1)
sys.stdout.flush()

How to take screenshot of webpage in C#

I am totally new to C# coding - I am trying to take screen shots of webpages whose URLs are initially picked up form a notepad uploaded on the same form.
As I read through the documentation on the web_browser control in MSDN.. I did arrive at the following code - yet when I run, I only get white screens
I tried uploading a .txt with (google/yahoo URLs as test data in 2 lines)
Can someone please say what more should I take care apart from handling which should get what I want as I read in MSDN.
P.S: pls forgive if I'm terribly wrong in coding style .. as aforesaid I'm just starting my C# coding :)
Code that I tried...
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace MSDN_wbc_tut1
{
public partial class Form1 : Form
{
public int temp = 0;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void FileUploadButton1_Click(object sender, EventArgs e)
{
//once a file is uploaded i want Pgm to read contents & browse them as URLS
OpenFileDialog openFileDialog = new OpenFileDialog();
openFileDialog.CheckFileExists = true;
openFileDialog.AddExtension = true;
openFileDialog.Multiselect = true;
//Filtering for Text files alone
openFileDialog.Filter = "text files (*.txt)|*.txt";
//if file is selected we must then do our coding part to proceed hecneforth
if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
//my code to say pgm wat to do once upload done...
//Getting my Chosen file's name
string Fileuploaded = openFileDialog.FileName;
//Read all line opens files - reads till EOF & closes ,prevents a while condition
string[] FileuploadedContent = System.IO.File.ReadAllLines(Fileuploaded);
foreach (string s in FileuploadedContent)
{
NavigateContent(s);
}
}
}
private void NavigateContent(string lineasurl)
{
// Add an event handler that images the document after it loads.
try
{
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler
(takescreen);
webBrowser1.Navigate(new Uri(lineasurl));
//webBrowser1.Navigate(lineasurl); also works
}
catch (System.UriFormatException)
{
return;
}
}
private void takescreen(object sender, WebBrowserDocumentCompletedEventArgs e)
{
//specifying sample values for image or screenshot size
int x = 600, y = 700;
Bitmap bitmap = new Bitmap(x, y);
webBrowser1.DrawToBitmap(bitmap, new Rectangle(0, 0, x, y));
//to give each screen a unique name - i append some no onto it
temp = temp + 1;
string TempFname = "Screenshotref" + temp.ToString() + "." + "jpg";
bitmap.Save(TempFname);
}
}
}