PipeExec Component

Properties   Methods   Events   Config Settings   Errors  

PipeExec provides an easy way to start and interact with a process over Stdin, Stdout, and Stderr.

Syntax

nsoftware.IPWorksIPC.PipeExec

Remarks

The PipeExec component provides a way to launch a process and then send/receive data to/from the process. To begin set ProcessFileName to the path of the process on disk. Optionally set ProcessArgs and ProcessWorkingDir.

Call StartProcess to start the process. Next call Send to send data to the process. Received data will be provided through the Stdout and Stderr events.

To terminate the process call StopProcess.

Example Code Pipeexec exec = new Pipeexec(); exec.OnStdout += exec_OnStdout; exec.ProcessFileName = @"C:\Windows\system32\cmd.exe"; exec.ProcessArgs = "/Q"; exec.StartProcess(); exec.Stdin = "dir" + System.Environment.NewLine; while (true) //Wait for output exec.DoEvents(); static void exec_OnStdout(object sender, PipeexecStdoutEventArgs e) { Console.WriteLine(e.Text); }

Property List

The following is the full list of the properties of the component with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the component with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the component with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the component with short descriptions. Click on the links for further details.

AcceptData Property (PipeExec Component)

Enables or disables data reception (the Stdout and Stderr events).

Syntax

• C#
• VB.NET

public bool AcceptData { get; set; }

Public Property AcceptData As Boolean

Default Value

True

Remarks

This property enables or disables data reception (the Stdout and Stderr events). Setting this property to False, temporarily disables data reception. Setting this property to True, re-enables data reception.

This property is not available at design time.

BytesSent Property (PipeExec Component)

The number of bytes actually sent after a call to the SendStdinText or SendStdinBytes method.

Syntax

• C#
• VB.NET

public int BytesSent { get; }

Public ReadOnly Property BytesSent As Integer

Default Value

0

Remarks

This property indicates how many bytes were sent after the last call to SendStdinText or SendStdinBytes. Please check the SendStdinText or SendStdinBytes method for more information. Note: that BytesSent will always return 0 when the component is operating in synchronous mode (i.e., the Timeout property is set to a positive value.)

This property is read-only and not available at design time.

EOL Property (PipeExec Component)

This property is used to break the incoming data stream into chunks separated by EOL .

Syntax

• C#
• VB.NET

public string EOL { get; set; }
public byte[] EOLB { get; set; }

Public Property EOL As String
Public Property EOLB As Byte()

Default Value

""

Remarks

This property is used to define boundaries in the input stream using the value of the property.

This property is especially useful with ASCII files. Setting it to CRLF ("\r\n") enables the incoming ASCII text stream to split into defined lines. In this case, one event is fired for each line received (as well as in packet boundaries). The CRLF ("\r\n") bytes are discarded.

This property is a binary string. Notably, this means that it can be more than one byte long, and it can contain NULL bytes.

ProcessArgs Property (PipeExec Component)

The arguments to pass to the process

Syntax

• C#
• VB.NET

public string ProcessArgs { get; set; }

Public Property ProcessArgs As String

Default Value

""

Remarks

This property specifies the arguments that will be passed to the process when it is started.

This property is not available at design time.

ProcessFileName Property (PipeExec Component)

The path to the file on disk to execute.

Syntax

• C#
• VB.NET

public string ProcessFileName { get; set; }

Public Property ProcessFileName As String

Default Value

""

Remarks

This property specifies the path to the file on disk that will be executed. ProcessArgs optionally specifies the arguments that will be passed. ProcessWorkingDir optionally specifies the working directory in which the process will run.

This property is not available at design time.

ProcessRunning Property (PipeExec Component)

Whether the process is running.

Syntax

• C#
• VB.NET

public bool ProcessRunning { get; }

Public ReadOnly Property ProcessRunning As Boolean

Default Value

False

Remarks

This property indicates whether the process specified by ProcessFileName is running.

After calling StartProcess this property returns True. After calling StopProcess this property returns False.

This property is read-only and not available at design time.

ProcessWorkingDir Property (PipeExec Component)

The working directory of the process.

Syntax

• C#
• VB.NET

public string ProcessWorkingDir { get; set; }

Public Property ProcessWorkingDir As String

Default Value

""

Remarks

This property optionally specifies the working directory in which the process will run.

This property is not available at design time.

SingleLineMode Property (PipeExec Component)

This property includes a special mode for line-oriented protocols.

Syntax

• C#
• VB.NET

public bool SingleLineMode { get; set; }

Public Property SingleLineMode As Boolean

Default Value

False

Remarks

When this property is set to True, the component treats the incoming data stream as lines separated by carriage return line feed (CRLF), CR, or LF. The EOL property is ignored.

When this property is set to True, AcceptData automatically will be set to False. Please refer to the GetLine method for more information.

This property is not available at design time.

Timeout Property (PipeExec Component)

This property includes the timeout for the component.

Syntax

• C#
• VB.NET

public int Timeout { get; set; }

Public Property Timeout As Integer

Default Value

60

Remarks

This property defines the timeout when sending data. When SSLEnabled is False a value of 0 means data will be sent asynchronously and a positive value means data is sent synchronously. When SSLEnabled is True all data is sent synchronously regardless of the Timeout value. Please see the notes below for details.

Plaintext

If the Timeout property is set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data cannot be sent immediately.

If Timeout is set to a positive value, data is sent in a blocking manner and the component will wait for the operation to complete before returning control. The component will handle any potential WOULDBLOCK errors internally and automatically retry the operation for a maximum of Timeout seconds.

SSL

If the Timeout property is set to 0, all operations will run uninterrupted until successful completion or an error condition is encountered.

If Timeout is set to a positive value, the component will wait for the operation to complete before returning control.

Additional Notes

The component will use DoEvents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive.

If Timeout expires, and the operation is not yet complete, the component throws an exception.

Note: By default, all timeouts are inactivity timeouts, that is, the timeout period is extended by Timeout seconds when any amount of data is successfully sent or received.

The default value for the Timeout property is 60 seconds.

Config Method (PipeExec Component)

Sets or retrieves a configuration setting.

Syntax

• C#
• VB.NET

public string Config(string configurationString);

Async Version
public async Task<string> Config(string configurationString);
public async Task<string> Config(string configurationString, CancellationToken cancellationToken);

Public Function Config(ByVal ConfigurationString As String) As String

Async Version
Public Function Config(ByVal ConfigurationString As String) As Task(Of String)
Public Function Config(ByVal ConfigurationString As String, cancellationToken As CancellationToken) As Task(Of String)

Remarks

Config is a generic method available in every component. It is used to set and retrieve configuration settings for the component.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the component, access to these internal properties is provided through the Config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

DoEvents Method (PipeExec Component)

This method processes events from the internal message queue.

Syntax

• C#
• VB.NET

public void DoEvents();

Async Version
public async Task DoEvents();
public async Task DoEvents(CancellationToken cancellationToken);

Public Sub DoEvents()

Async Version
Public Sub DoEvents() As Task
Public Sub DoEvents(cancellationToken As CancellationToken) As Task

Remarks

When DoEvents is called, the component processes any available events. If no events are available, it waits for a preset period of time, and then returns.

GetLine Method (PipeExec Component)

This method gets a line of text from the server.

Syntax

• C#
• VB.NET

public string GetLine();

Async Version
public async Task<string> GetLine();
public async Task<string> GetLine(CancellationToken cancellationToken);

Public Function GetLine() As String

Async Version
Public Function GetLine() As Task(Of String)
Public Function GetLine(cancellationToken As CancellationToken) As Task(Of String)

Remarks

This method gets a line of text from the server. This method is an alternative method of receiving data for line-oriented protocols. The component will block if necessary and then will return the received line. AcceptData will be set automatically to True when the method is called, and then will be set to False after a line is received.

Please refer to the SingleLineMode property for more information.

Interrupt Method (PipeExec Component)

This method interrupts the current action.

Syntax

• C#
• VB.NET

public void Interrupt();

Async Version
public async Task Interrupt();
public async Task Interrupt(CancellationToken cancellationToken);

Public Sub Interrupt()

Async Version
Public Sub Interrupt() As Task
Public Sub Interrupt(cancellationToken As CancellationToken) As Task

Remarks

This method interrupts the current action. If you use SendFile to upload a file, the component will run synchronously until the upload is completed. This method will allow you to stop the file from uploading without disconnecting from the host.

Send Method (PipeExec Component)

Sends data over the connected pipe.

Syntax

• C#
• VB.NET

public void Send(byte[] text);

Async Version
public async Task Send(byte[] text);
public async Task Send(byte[] text, CancellationToken cancellationToken);

Public Sub Send(ByVal Text As String)

Async Version
Public Sub Send(ByVal Text As String) As Task
Public Sub Send(ByVal Text As String, cancellationToken As CancellationToken) As Task

Remarks

This method sends data to the server.

SendFile Method (PipeExec Component)

Sends the file over the connected pipe.

Syntax

• C#
• VB.NET

public void SendFile(string fileName);

Async Version
public async Task SendFile(string fileName);
public async Task SendFile(string fileName, CancellationToken cancellationToken);

Public Sub SendFile(ByVal FileName As String)

Async Version
Public Sub SendFile(ByVal FileName As String) As Task
Public Sub SendFile(ByVal FileName As String, cancellationToken As CancellationToken) As Task

Remarks

This method sends the specified file to the server/process over the connected pipe.

Timeout must be set to a positive value so that the component will operate synchronously.

SendLine Method (PipeExec Component)

This method sends a string followed by a newline.

Syntax

• C#
• VB.NET

public void SendLine(string text);

Async Version
public async Task SendLine(string text);
public async Task SendLine(string text, CancellationToken cancellationToken);

Public Sub SendLine(ByVal Text As String)

Async Version
Public Sub SendLine(ByVal Text As String) As Task
Public Sub SendLine(ByVal Text As String, cancellationToken As CancellationToken) As Task

Remarks

This method sends a string followed by a newline. This method is used to send data with line-oriented protocols. The line is followed by CRLF ("\r\n") .

Please refer to the GetLine method and SingleLineMode property for more information.

SendStdinBytes Method (PipeExec Component)

This method sends binary data over the connected pipe.

Syntax

• C#
• VB.NET

public void SendStdinBytes(byte[] data);

Async Version
public async Task SendStdinBytes(byte[] data);
public async Task SendStdinBytes(byte[] data, CancellationToken cancellationToken);

Public Sub SendStdinBytes(ByVal Data As String)

Async Version
Public Sub SendStdinBytes(ByVal Data As String) As Task
Public Sub SendStdinBytes(ByVal Data As String, cancellationToken As CancellationToken) As Task

Remarks

This method sends the specified binary data to the server over Stdin. To send text, use the SendStdinText method instead.

When Timeout is set to 0 the component will behave asynchronously. If you are sending data to the receiving process faster than it can process it, the outgoing queue might fill up. When this happens, the component fails with exception 10035: "[10035] Operation would block" (WSAEWOULDBLOCK). You can check this error, and then try to send the data again. The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again. (However, please note that ReadyToSend is not fired when part of the data is successfully sent).

SendStdinText Method (PipeExec Component)

This method sends text over the connected pipe.

Syntax

• C#
• VB.NET

public void SendStdinText(string text);

Async Version
public async Task SendStdinText(string text);
public async Task SendStdinText(string text, CancellationToken cancellationToken);

Public Sub SendStdinText(ByVal Text As String)

Async Version
Public Sub SendStdinText(ByVal Text As String) As Task
Public Sub SendStdinText(ByVal Text As String, cancellationToken As CancellationToken) As Task

Remarks

This method sends the specified text to the server over Stdin. To send binary data, use the SendStdinBytes method instead.

When Timeout is set to 0 the component will behave asynchronously. If you are sending data to the receiving process faster than it can process it, the outgoing queue might fill up. When this happens, the component fails with exception 10035: "[10035] Operation would block" (WSAEWOULDBLOCK). You can check this error, and then try to send the data again. The BytesSent property shows how many bytes were sent (if any). If 0 bytes were sent, then you can wait for the ReadyToSend event before attempting to send data again. (However, please note that ReadyToSend is not fired when part of the data is successfully sent).

StartProcess Method (PipeExec Component)

Starts the process.

Syntax

• C#
• VB.NET

public void StartProcess();

Async Version
public async Task StartProcess();
public async Task StartProcess(CancellationToken cancellationToken);

Public Sub StartProcess()

Async Version
Public Sub StartProcess() As Task
Public Sub StartProcess(cancellationToken As CancellationToken) As Task

Remarks

This method starts the process specified by StartProcess. After starting the process data may be sent to the process by calling Send, SendLine, Send.

Data received from the process will be available from the Stdout and Stderr events.

The following properties are applicable when calling this method:

• ProcessFileName (required)
• ProcessArgs
• ProcessWorkingDir

StopProcess Method (PipeExec Component)

Stops the process.

Syntax

• C#
• VB.NET

public void StopProcess();

Async Version
public async Task StopProcess();
public async Task StopProcess(CancellationToken cancellationToken);

Public Sub StopProcess()

Async Version
Public Sub StopProcess() As Task
Public Sub StopProcess(cancellationToken As CancellationToken) As Task

Remarks

This method stops the process.

Error Event (PipeExec Component)

Fired when information is available about errors during data delivery.

Syntax

• C#
• VB.NET

public event OnErrorHandler OnError;

public delegate void OnErrorHandler(object sender, PipeExecErrorEventArgs e);

public class PipeExecErrorEventArgs : EventArgs {
  public int ErrorCode { get; }
  public string Description { get; }
}

Public Event OnError As OnErrorHandler

Public Delegate Sub OnErrorHandler(sender As Object, e As PipeExecErrorEventArgs)

Public Class PipeExecErrorEventArgs Inherits EventArgs
  Public ReadOnly Property ErrorCode As Integer
  Public ReadOnly Property Description As String
End Class

Remarks

The Error event is fired in case of exceptional conditions during message processing. Normally the component throws an exception.

The ErrorCode parameter contains an error code, and the Description parameter contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ReadyToSend Event (PipeExec Component)

Fired when the component is ready to send data.

Syntax

• C#
• VB.NET

public event OnReadyToSendHandler OnReadyToSend;

public delegate void OnReadyToSendHandler(object sender, PipeExecReadyToSendEventArgs e);

public class PipeExecReadyToSendEventArgs : EventArgs {
}

Public Event OnReadyToSend As OnReadyToSendHandler

Public Delegate Sub OnReadyToSendHandler(sender As Object, e As PipeExecReadyToSendEventArgs)

Public Class PipeExecReadyToSendEventArgs Inherits EventArgs
End Class

Remarks

The ReadyToSend event indicates that the underlying pipe is ready to accept data again after a failed send. The event is also fired immediately after a connection to the remote host is established.

Stderr Event (PipeExec Component)

Fired when data come in through stderr.

Syntax

• C#
• VB.NET

public event OnStderrHandler OnStderr;

public delegate void OnStderrHandler(object sender, PipeExecStderrEventArgs e);

public class PipeExecStderrEventArgs : EventArgs {
  public string Text { get; }
  public byte[] TextB { get; }
  public bool EOL { get; }
}

Public Event OnStderr As OnStderrHandler

Public Delegate Sub OnStderrHandler(sender As Object, e As PipeExecStderrEventArgs)

Public Class PipeExecStderrEventArgs Inherits EventArgs
  Public ReadOnly Property Text As String
  Public ReadOnly Property TextB As Byte()
  Public ReadOnly Property EOL As Boolean
End Class

Remarks

The Stderr event is fired every time the process outputs a line in its standard output. The incoming data is provided through the Text parameter.

Stdout Event (PipeExec Component)

Fired when data come in through stdout.

Syntax

• C#
• VB.NET

public event OnStdoutHandler OnStdout;

public delegate void OnStdoutHandler(object sender, PipeExecStdoutEventArgs e);

public class PipeExecStdoutEventArgs : EventArgs {
  public string Text { get; }
  public byte[] TextB { get; }
  public bool EOL { get; }
}

Public Event OnStdout As OnStdoutHandler

Public Delegate Sub OnStdoutHandler(sender As Object, e As PipeExecStdoutEventArgs)

Public Class PipeExecStdoutEventArgs Inherits EventArgs
  Public ReadOnly Property Text As String
  Public ReadOnly Property TextB As Byte()
  Public ReadOnly Property EOL As Boolean
End Class

Remarks

The Stdout event is fired every time the process outputs a line in its standard output. The incoming data is provided through the Text parameter.

EOL indicates whether or not the EOL string was found at the end of Text. If the EOL string was found, then EOL is True.

If Text is part of a data portion of length larger than MaxLineLength with no EOL strings in it, then EOL is False. Note: This means that one or more DataIn events with EOL set to False can be received during a connection.

If the EOL property is "" (empty string), then EOL can be disregarded (it is always True).

Config Settings (PipeExec Component)

PipeExec Config Settings

Base Config Settings

Trappable Errors (PipeExec Component)

PipeExec Errors