Develop Reference

Serial Communication Port will get Closed after clicking on Close button in C#

I am working on project in C# windows form application.
In this project main Form contain subform for communication of serial port. SubForm "Connect" have two buttons Connect and Close. Also 5 comboboxes to select baudrate, Com name,parity, stopbits and databits.
When I click on Connect button after selecting all settings from comboboxes. port gets connected and connect button becomes Disconnect. And I will close the Connect form
Now my problem is that when I reopen the form, without clicking on Disconnect button when i Close the form , the Comport will disconnected. I don't want that ComPort close.
Please help me to solve this bug. I don't know where I did mistake. Thanks in advance.
Connect Class Code
public partial class Connect : Form
{
public bool Connect_Status = false;
public Connect()
{
InitializeComponent();
COM_List();
}
private void COM_List()
{
for (int i = 0; i < CommPortManager.Instance.GetCommList().Count; i++)
{
cb_CommPort.Items.Add(CommPortManager.Instance.GetCommList()[i]);
}
}
private void btn_Connect_Click(object sender, EventArgs e)
{
if (btn_Connect.Text == "Connect")
{
CommPortManager.Instance.PortName = cb_CommPort.Text;
CommPortManager.Instance.BaudRate = cb_BaudRate.Text;
CommPortManager.Instance.Parity = cb_Parity.Text;
CommPortManager.Instance.StopBits = cb_StopBits.Text;
CommPortManager.Instance.DataBits = cb_DataBits.Text;
if ((cb_CommPort.Text == "") || (cb_BaudRate.Text == "") || (cb_Parity.Text == "") || (cb_DataBits.Text == "") || (cb_StopBits.Text == ""))
{
if (cb_CommPort.Text == "")
{
MessageBox.Show("Please select COM Port and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_BaudRate.Text == "")
{
MessageBox.Show("Please select BaudRate and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_Parity.Text == "")
{
MessageBox.Show("Please select Parity and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if (cb_DataBits.Text == "")
{
MessageBox.Show("Please select DataBits and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else if(cb_StopBits.Text == "")
{
MessageBox.Show("Please select StopBits and then Connect", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
Connect_Status = false;
}
else
{
if (CommPortManager.Instance.COM_Open() == false)
{
MessageBox.Show("Could not open the COM port. Most likely it is already in use, has been removed, or is unavailable.", "TestCertificate", MessageBoxButtons.OK, MessageBoxIcon.Information);
Connect_Status = false;
}
else
{
//CommPortManager.Instance.COM_Close();
Connect_Status = true;
btn_Connect.Text = "Disconnect";
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
btn_Connect.BackColor = System.Drawing.Color.Salmon;
}
}
}
else
{
CommPortManager.Instance.COM_Close();
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}
private void btn_Close_Click(object sender, EventArgs e)
{
this.Close();
}
private void Connect_Load(object sender, EventArgs e)
{
//code here to setup the value;
cb_CommPort.Text = CommPortManager.Instance.PortName;
cb_BaudRate.Text = CommPortManager.Instance.BaudRate;
cb_Parity.Text = CommPortManager.Instance.Parity;
cb_StopBits.Text = CommPortManager.Instance.StopBits;
cb_DataBits.Text = CommPortManager.Instance.DataBits;
if (CommPortManager.Instance.IsOpen == true)
{
btn_Connect.Text = "Disconnect";
btn_Connect.BackColor = System.Drawing.Color.Salmon;
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
}
else
{
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}
}

I suspect that the form load event. you need to set the connection status true when its open
private void Connect_Load(object sender, EventArgs e)
{
//code here to setup the value;
cb_CommPort.Text = CommPortManager.Instance.PortName;
cb_BaudRate.Text = CommPortManager.Instance.BaudRate;
cb_Parity.Text = CommPortManager.Instance.Parity;
cb_StopBits.Text = CommPortManager.Instance.StopBits;
cb_DataBits.Text = CommPortManager.Instance.DataBits;
if (CommPortManager.Instance.IsOpen == true)
{
Connect_Status = true;
btn_Connect.Text = "Disconnect";
btn_Connect.BackColor = System.Drawing.Color.Salmon;
cb_CommPort.Enabled = false;
cb_BaudRate.Enabled = false;
cb_DataBits.Enabled = false;
cb_Parity.Enabled = false;
cb_StopBits.Enabled = false;
}
else
{
btn_Connect.Text = "Connect";
Connect_Status = false;
cb_CommPort.Enabled = true;
cb_BaudRate.Enabled = true;
cb_DataBits.Enabled = true;
cb_Parity.Enabled = true;
cb_StopBits.Enabled = true;
btn_Connect.BackColor = System.Drawing.Color.DarkTurquoise;
}
}

It looks like that if you press Connect it changes your btn_Connect.Text to
Disconnect (if the port is open)
now the button text is "Disconnect" and if (btn_Connect.Text == "Connect") is now false and the else is called which does CommPortManager.Instance.COM_Close();

How to open form inside method, submit button and then come back to original method and continue?

Our application requires that a witness must authenticate before a logged in user can perform enrollment operations (Enroll and Delete).
This is not an issue for Enrolling as I can add a check (IsWitnessApproved) to an enrollment_OnStartEnroll method I.E. before the Capture method is called and fired.
However, this is not possible for Deletion as I don't have access to a point where the enrollment_OnDelete method hasn't fired.
I haven't been able to get a response to this issue from Digital Persona so I'm now looking at work-arounds.
I'm exploring if its possible to open up a new form (WitnessApproval) inside the enrollment_OnDelete method, approve the witness in the form (btnConfirmWitness_Click) and then come back into the method and continue on with the deletion?
enrollment_OnDelete method:
private void enrollment_OnDelete(DPCtlUruNet.EnrollmentControl enrollmentControl, Constants.ResultCode result, int fingerPosition)
{
if (!witnessApproved)
{
WitnessApproval witnessApproval = new WitnessApproval();
witnessApproval.Show();
}
else
{
int fingerMask = GetFingerMask(fingerPosition);
if (enrollmentControl.Reader != null)
{
try
{
// Delete from database
new EnrollmentDAL().DeleteEnrolledFingerprint(Settings.Default.Username, fingerMask, txt_WitnessName.Text);
MessageBox.Show("Fingerprint deleted.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
pbFingerprint.Image = null;
pbFingerprint.Visible = false;
btnCancel.Visible = false;
witnessApproved = false;
txt_WitnessName.Text = String.Empty;
txt_WitnessPassword.Text = String.Empty;
}
catch (Exception ex)
{
MessageBox.Show("There was a problem deleting the fingerprint.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
new Util().LogError(ex);
}
}
else
{
MessageBox.Show("No Reader Connected.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
_sender.Fmds.Remove(fingerPosition);
}
}
Selected WitnessApproval methods:
private void btnConfirmWitness_Click(object sender, EventArgs e)
{
lbl_Validation.Visible = false;
if (txt_WitnessName.Text == String.Empty)
{
SetMessage("Please enter a Witness.");
return;
}
if (txt_WitnessPassword.Text == String.Empty)
{
SetMessage("Please enter a Password.");
return;
}
if (txt_WitnessName.Text == Settings.Default.Username)
{
SetMessage("User and witness cannot be the same.");
return;
}
bool IsValidate = Membership.ValidateUser(txt_WitnessName.Text, txt_WitnessPassword.Text);
Settings.Default.WitnessName = txt_WitnessName.Text;
Settings.Default.WitnessPassword = txt_WitnessPassword.Text;
if (IsValidate)
{
this.Close();
// Allow enrollment operations
}
else
{
SetMessage("Witness credentials invalid.");
}
}
private void btnCancelWitness_Click(object sender, EventArgs e)
{
this.Close();
// DO NOT Allow enrollment operations
witnessCancelled = true;
}
private void SetMessage(string message)
{
lbl_Validation.Visible = true;
lbl_Validation.Text = message;
}

How to open form inside method, submit button and then come back to original method and continue?
There is ShowDialog method for this purposes.
Here is usage example from MSDN:
public void ShowMyDialogBox()
{
Form2 testDialog = new Form2();
// Show testDialog as a modal dialog and determine if DialogResult = OK.
if (testDialog.ShowDialog(this) == DialogResult.OK)
{
// Read the contents of testDialog's TextBox.
this.txtResult.Text = testDialog.TextBox1.Text;
}
else
{
this.txtResult.Text = "Cancelled";
}
testDialog.Dispose();
}
In your case, Form2 is WitnessApproval.
In WitnessApproval Form button handlers you will also need to set DialogResult to true when the witness is approved or to false when user cancelled operation.

how to release thread is required in multiple thread?

As title, how to release thread is required in multiple thread ?
Ex : I have 5 thread is waiting. I only want thread position 3 is released
I use autoresetevent/manualresetevent/monitor.wait and monitor.pulse but all release thread follow FIFO
help me !!!
UPDATED:
This is form1:
private BackgroundWorker[] threadArray;
public static ManualResetEvent _manualResetEvent = new ManualResetEvent(false);
private void btn_Start_Scraping_Click(object sender, EventArgs e)
{
threadArray = new BackgroundWorker[listView_Site.Items.Count];
for (var f = 0; f < listView_Site.Items.Count; f++)
{
threadArray[f] = new BackgroundWorker();
threadArray[f].DoWork += new DoWorkEventHandler(BackgroundWorkerFilesDoWork);
threadArray[f].RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorkerFilesRunWorkerCompleted);
threadArray[f].ProgressChanged += new ProgressChangedEventHandler(BackgroundWorkerFilesProgressChanged);
threadArray[f].WorkerReportsProgress = true;
threadArray[f].WorkerSupportsCancellation = true;
threadArray[f].RunWorkerAsync(listView_Site.Items[f].Tag.ToString());
}
}
private void BackgroundWorkerFilesDoWork(object sender, DoWorkEventArgs e)
{
....// all above code is fine
requestCaptcha = (HttpWebRequest)WebRequest.Create(uriCaptchaPage);
requestCaptcha.Pipelined = true;
requestCaptcha.KeepAlive = true;
requestCaptcha.AllowAutoRedirect = false;
//request.Proxy = null;
requestCaptcha.Timeout = 60000;
requestCaptcha.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
requestCaptcha.CookieContainer = sessionID;
request.ServicePoint.Expect100Continue = false;
requestCaptcha.Method = "GET";
requestCaptcha.Referer = uriloginPage.AbsoluteUri;
//get response.
responseCaptcha = (HttpWebResponse)requestCaptcha.GetResponse();
Stream imagestream = responseCaptcha.GetResponseStream();
if (imagestream != null)
{
Image image = Image.FromStream(imagestream);
if (Directory.Exists(Application.StartupPath + "\\Captcha") == false)
{
Directory.CreateDirectory(Application.StartupPath + "\\Captcha");
}
switch (responseCaptcha.ContentType)
{
case "image/jpeg":
{
saveLocation += ".jpg";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation,ImageFormat.Jpeg);
break;
}
case "image/gif":
{
saveLocation += ".gif";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation, ImageFormat.Gif);
break;
}
case "image/png":
{
saveLocation += ".png";
if (File.Exists(saveLocation))
{
File.Delete(saveLocation);
}
image.Save(saveLocation, ImageFormat.Png);
break;
}
}
//show form2 to enter captcha
lock (_lockObj)
{
if (Application.OpenForms.OfType<frmCaptchaQuestion>().Any() == false)
{
DoOnUIThread(delegate()
{
_formCaptchaQuestion.CreatePanelCaptcha(uriloginPage, saveLocation,idHomePage);
_formCaptchaQuestion.Show();
});
}
else
{
DoOnUIThread(() => _formCaptchaQuestion.CreatePanelCaptcha(uriloginPage, saveLocation,idHomePage));
}
}
//wait and get captcha from form2 and only run thread is required
//this is my problem <<<<========================================
lock (_lockObj)
{
//_manualResetEvent.WaitOne(30000);
//_manualResetEvent.Reset();
//if (clsValueStatic.CaptchaText != null)
//{
// foreach (var id in clsValueStatic.CaptchaText)
// {
while (!_go)
{
Monitor.Wait(_lockObj);
}
// }
//}
}
requestCaptcha = (HttpWebRequest)WebRequest.Create(uriActionLoginPage);
requestCaptcha.Pipelined = true;
requestCaptcha.KeepAlive = true;
requestCaptcha.AllowAutoRedirect = false;
//request.Proxy = null;
requestCaptcha.Timeout = 60000;
requestCaptcha.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");
requestCaptcha.CookieContainer = sessionID;
request.ServicePoint.Expect100Continue = false;
requestCaptcha.Method = "GET";
}
Form2:
private void textBoxCaptcha_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
var textBox = sender as TextBoxX;
if (textBox != null)
{
clsValueStatic.CaptchaText = textBox.Text.Trim();
textBox.Parent.Parent.Dispose();
frmScrapingAnalysis._manualResetEvent.Set();
}
}
}
PS : Form1 have 1 button to start multiple backgroundworker and show form2 then all backgroundworker wait to get text captcha of textbox from form2
my way want when user enter text of backgroundworker is shown on form2 then only the backgroundworker is released. All other backgroundworker still wait

Cannot change WPF controls status before starting thread

I want to change wpf controls status after click button start.
The picture is what I want.
Following is my code
private bool _bWorking = false;
public delegate void UpdateStatusDelegate();
private void SetStatus(bool bEnable)
{
if (bEnable)
{
tbName.IsReadOnly = false;
barStatus.Visibility = Visibility.Hidden;
btnStart.IsEnabled = true;
btnStop.IsEnabled = false;
btnClose.IsEnabled = true;
}
else
{
tbName.IsReadOnly = true;
barStatus.Visibility = Visibility.Visible;
btnStart.IsEnabled = false;
btnStop.IsEnabled = true;
btnClose.IsEnabled = false;
}
}
internal void UpdateStatus()
{
SetStatus(true);
_bWorking = false;
}
private void ThreadFunc()
{
//for (; ; )
//{
// // do something here
// if (_bWorking == false)
// break;
//}
Thread.Sleep(500);
this.Dispatcher.Invoke(new UpdateStatusDelegate(UpdateStatus));
}
private void btnStart_Click(object sender, RoutedEventArgs e)
{
_bWorking = true;
SetStatus(false);
this.UpdateLayout();//this.InvalidateVisual();
try
{
Thread t = new Thread(new ThreadStart(() =>
{
ThreadFunc();
}));
t.IsBackground = true;
t.Name = "test status";
t.Start();
while (t.IsAlive)
{
// wait thread exit
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void btnStop_Click(object sender, RoutedEventArgs e)
{
_bWorking = false;
SetStatus(true);
}
But actually after I click button start, the UI seems frozen, and the thread exited, the UI become normal.
my VS is VS2010.
Force a WPF control to refresh?
this post is not work for me.
edit summary:
add delegate void UpdateStatusDelegate() and function UpdateStatus() to my code

// wait thread exit
The whole point of a background thread is to not wait for it by blocking your UI thread. Don't.
Instead, have the thread notify your UI when it's done.

Try to use BackgroundWorker component it might help you. For more information check the MSDN article

workable code
public delegate void UpdateStatusDelegate();
private bool _bWorking = false;
private void SetStatus(bool bEnable)
{
if (bEnable)
{
tbName.IsReadOnly = false;
barStatus.Visibility = Visibility.Hidden;
btnStart.IsEnabled = true;
btnStop.IsEnabled = false;
btnClose.IsEnabled = true;
}
else
{
tbName.IsReadOnly = true;
barStatus.Visibility = Visibility.Visible;
btnStart.IsEnabled = false;
btnStop.IsEnabled = true;
btnClose.IsEnabled = false;
}
}
internal void UpdateStatus()
{
SetStatus(true);
}
private void ThreadFunc()
{
try
{
// use Stopwatch to simulate jobs
var watch = Stopwatch.StartNew();
for (; ; )
{
var elapsedMs = watch.ElapsedMilliseconds;
if (elapsedMs > 10000 // 10 seconds
|| _bWorking == false)
{
break;
}
}
watch.Stop();
this.Dispatcher.Invoke(new UpdateStatusDelegate(UpdateStatus));
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
_bWorking = false;
}
private void btnStart_Click(object sender, RoutedEventArgs e)
{
try
{
_bWorking = true;
SetStatus(false);
Thread t = new Thread(new ThreadStart(() =>
{
ThreadFunc();
}));
t.IsBackground = true;
t.Name = "test status";
t.Start();
//while (t.IsAlive)
{
// wait thread exit
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void btnStop_Click(object sender, RoutedEventArgs e)
{
_bWorking = false;
SetStatus(true);
}

Handling errors while inside a button

I have a windows form that involes filling out textboxes with information and then clicking connect. I have error messages that pops up if any of the textboxes are empty but when I hit OK the program just continues and I end up getting run-time errors because there's insufficient information, and the program crashes. What I want is for the program to go back to the point before I hit "Connect" whenever any textbox is not filled out correctly.
This is the code:
private void cmdConnect_Click(object sender, EventArgs e)
{
if (cmdConnect.Text == "Connect")
{
if (txtGroup.Text == "")
{
txtGroup.Text = "_Group01";
}
if (txtItemID.Text == "")
{
MessageBox.Show("Please enter ItemID.", "Connect Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
switch (cboServer.Text)
{
case "":
MessageBox.Show("Please select and OPC server", "Connect Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
break;
case "RSLinx Remote OPC Server":
if (txtMachine.Text == "")
{
MessageBox.Show("Please enter a machine name for remote connection", "Connect Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
break;
}
else
{
oOpcServer.Connect(cboServer.Text, txtMachine.Text);
}
break;
case "RSLinx OPC Server":
oOpcServer.Connect(cboServer.Text);
break;
default:
if (txtMachine.Text == "")
{
oOpcServer.Connect(cboServer.Text);
}
else
{
oOpcServer.Connect(cboServer.Text, txtMachine.Text);
}
break;
}
oOpcGroup = oOpcServer.OPCGroups.Add(txtGroup.Text);
oOpcGroup.IsSubscribed = true;
oOpcGroup.IsActive = false;
oOpcGroup.UpdateRate = 1000;
ClHandle = 1;
oOpcGroup.OPCItems.DefaultAccessPath = txtAccessPath.Text;
oOpcGroup.OPCItems.AddItem(txtItemID.Text, ClHandle);
cmdItemWrite.Enabled = true;
cmdItemRead.Enabled = true;
cmdSyncWrite.Enabled = true;
cmdSyncRead.Enabled = true;
cmdAsyncWrite.Enabled = true;
cmdAsyncRead.Enabled = true;
cmdAdvise.Enabled = true;
txtSubValue.Enabled = true;
cboServer.Enabled = false;
txtMachine.Enabled = false;
txtGroup.Enabled = false;
txtAccessPath.Enabled = false;
txtItemID.Enabled = false;
cmdConnect.Text = "Disconnect";
}
else
{
oOpcServer.OPCGroups.RemoveAll();
oOpcGroup = null;
oOpcServer.Disconnect();
cmdConnect.Text = "Connect";
cmdItemWrite.Enabled = false;
cmdItemRead.Enabled = false;
cmdSyncWrite.Enabled = false;
cmdSyncRead.Enabled = false;
cmdAsyncWrite.Enabled = false;
cmdAsyncRead.Enabled = false;
cmdAdvise.Enabled = false;
txtSubValue.Enabled = false;
cboServer.Enabled = true;
txtMachine.Enabled = true;
txtGroup.Enabled = true;
txtAccessPath.Enabled = true;
txtItemID.Enabled = true;
}
oOpcGroup.DataChange += new RsiOPCAuto.DIOPCGroupEvent_DataChangeEventHandler(oOpcGroup_DataChange);
}

Adding a return statment after each message box would do the trick and cause the method to exit without doing the work at end.

Simplest solution, as Dervall mentioned is adding return statements after each MessageBox.Show call. But more elegant solution is using validation and error provider to highlight incorrect input data prior to executing connect logic.
Anyway, here is some thoughts on refactoring your code.
private void cmdConnect_Click(object sender, EventArgs e)
{
if (cmdConnect.Text == "Disconnect")
{
Disconnect();
SetControlsToDisconnectedState();
return;
}
if (String.IsNullOrWhiteSpace(txtGroup.Text))
txtGroup.Text = "_Group01";
if (String.IsNullOrWhiteSpace(txtItemID.Text))
{
ShowErrorMessage("Connect Error", "Please enter ItemID.");
return;
}
if (String.IsNullOrWhiteSpace(cboServer.Text))
{
ShowErrorMessage("Connect Error", "Please select and OPC server");
return;
}
Connect(cboServer.Text, txtMachine.Text);
DoSomethingWithGroup(txtGroup.Text, txtAccessPath.Text, txtItemID.Text);
SetControlsToConnectedState();
}
What changed:
It's more readable, when you verify which text on button, then which it don't have
Method ShowErrorMessage does exactly what it says
Verify text with IsNullOrWhiteSpace because it could be full of white spaces
Control state changing moved to separate code
Connecting/Disconnecting now separated from UI
Here other methods:
private void ShowErrorMessage(string title, string message)
{
MessageBox.Show(message, title, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
private void SetControlsToConnectedState()
{
UpdateControls(true);
}
private void SetControlsToDisconnectedState()
{
UpdateControls(false);
}
private void UpdateControls(bool isConnected)
{
cmdConnect.Text = isConnected ? "Disconnect" : "Connect";
cmdItemWrite.Enabled = isConnected;
cmdItemRead.Enabled = isConnected;
cmdSyncWrite.Enabled = isConnected;
cmdSyncRead.Enabled = isConnected;
cmdAsyncWrite.Enabled = isConnected;
cmdAsyncRead.Enabled = isConnected;
cmdAdvise.Enabled = isConnected;
txtSubValue.Enabled = isConnected;
cboServer.Enabled = !isConnected;
txtMachine.Enabled = !isConnected;
txtGroup.Enabled = !isConnected;
txtAccessPath.Enabled = !isConnected;
txtItemID.Enabled = !isConnected;
}
private void Disconnect()
{
oOpcServer.OPCGroups.RemoveAll();
oOpcGroup = null;
oOpcServer.Disconnect();
}
private void Connect(string serverName, string machineName)
{
switch (serverName)
{
case "RSLinx Remote OPC Server":
if (String.IsNullOrWhiteSpace(machineName))
{
ShowErrorMessage("Connect Error", "Please enter a machine name for remote connection");
return;
}
oOpcServer.Connect(serverName, machineName);
break;
case "RSLinx OPC Server":
oOpcServer.Connect(serverName);
break;
default:
if (String.IsNullOrWhiteSpace(machineName))
oOpcServer.Connect(serverName);
else
oOpcServer.Connect(serverName, machineName);
break;
}
}
private void DoSomethingWithGroup(string groupName, string accessPath, string itemID)
{
oOpcGroup = oOpcServer.OPCGroups.Add(groupName);
oOpcGroup.IsSubscribed = true;
oOpcGroup.IsActive = false;
oOpcGroup.UpdateRate = 1000;
ClHandle = 1;
oOpcGroup.OPCItems.DefaultAccessPath = accessPath;
oOpcGroup.OPCItems.AddItem(itemID, ClHandle);
oOpcGroup.DataChange += new RsiOPCAuto.DIOPCGroupEvent_DataChangeEventHandler(oOpcGroup_DataChange);
}