NetCode Component

Properties   Methods   Events   Config Settings   Errors  

The NetCode component can be used to encode or decode files or strings using a variety of popular encoding formats, such as Base64, UUencode, and URL. UUEncode , MIME's Base64 Quoted-Printable , and URL encoding formats, as well as secure hash functions such as MD5 and SHA1, are currently supported.

Syntax

nsoftware.IPWorks.NetCode

Remarks

The encoding format is specified by the Format property. The binary data, or the name of the file containing binary data, is specified by the DecodedData property and the encoded data or filename is specified by the EncodedData property. The FileName property may be used to override the default file names or to specify a directory during uuencoding. After uudecoding, the FileName property contains the fully specified file name of the decoded file.

Understanding Encoding/Decoding

Most mail systems use only 7 bits to transmit messages. A binary file, such as an archive or a non-plaintext-formatted file produced from a text processor should be first encoded in 7-bit code before email transfer.

Decoding is the inverse process (i.e., creation of the original file from the encoded data). Encoded data are often split over several files because of the size limit placed on the email message. Each message is preceded by information about this splitting, as well as the mail header. NetCode supports this case in both directions:

- During encoding, setting the MaxFileSize configuration setting to the maximum size of a message body instructs NetCode to split the encoded data over several files. Multiple filenames can be specified by using question marks "?" (see the EncodedData property for more information).

- During decoding, the body messages can be saved in separate files named namexxx.ext, where xxx is a numeral starting at 000 and ext is ".uue", ".b16", or ".q_p" according to Format. These multiple filenames should be given to EncodedData.

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.

DecodedData Property (NetCode Component)

This property includes the decoded data.

Syntax

• C#
• VB.NET

public string DecodedData { get; set; }
public byte[] DecodedDataB { get; set; }

Public Property DecodedData As String
Public Property DecodedDataB As Byte()

Default Value

""

Remarks

This property contains the decoded data. When uuencoding, the value of FileName is the filename that will be written in EncodedData. If FileName is empty, an error will be returned.

This property is not available at design time.

DecodedFile Property (NetCode Component)

This property includes the filename of the decoded data.

Syntax

• C#
• VB.NET

public string DecodedFile { get; set; }

Public Property DecodedFile As String

Default Value

""

Remarks

This property contains the filename of the decoded data. When uuencoding, the value of FileName is the filename that will be written in EncodedData. If FileName is empty, the value of the DecodedFile property is taken, if a valid file has been specified. It is recommended that EncodedData contains the full path and that FileName contains only the filename so that no problems occur while uudecoding in a foreign system.

When decoding, the component tries to generate the name for the created file in the following order: DecodedFile, FileName, or when the format is UUEncode, the specified filename in the uuencoded data. If DecodedFile or FileName end with a backslash "\" they are interpreted as directories, and the component will try to create the given filename in this directory. If this is the case, FileName shows the name of the file that was created.

EncodedData Property (NetCode Component)

This property includes the encoded data.

Syntax

• C#
• VB.NET

public string EncodedData { get; set; }
public byte[] EncodedDataB { get; set; }

Public Property EncodedData As String
Public Property EncodedDataB As Byte()

Default Value

""

Remarks

This property contains the data that either have been encoded or are set to be decoded.

This property is not available at design time.

EncodedFile Property (NetCode Component)

This property includes the filename of the encoded data.

Syntax

• C#
• VB.NET

public string EncodedFile { get; set; }

Public Property EncodedFile As String

Default Value

""

Remarks

This property contains the filename of the encoded data. If the encoded data are spread over several files, the filenames are passed to EncodedFile in the form name?. Question marks "?" are expanded to numerals starting with 0. The filenames should exist as path\file000.ext and are passed to EncodedFile in the form name???. Question marks "?" are expanded to numerals starting with 000 (the number of zeros "0" equals that of question marks "?").

The component appends the extension ".uue", ".b16", or ".q_p" depending on Format immediately after the generated numbers. FileCnt contains the number of encoded files.

See also the Format property, and the MaxFileSize configuration setting when working with multiple files.

FileCnt Property (NetCode Component)

This property shows the number of encoded files the component has read from or written into.

Syntax

• C#
• VB.NET

public int FileCnt { get; }

Public ReadOnly Property FileCnt As Integer

Default Value

0

Remarks

This property shows the number of encoded files the component has read from or written into. If the user specifies one or more questions marks "?" in EncodedFile, they will be expanded from 000 to FileCnt - 1 (the number of question marks "?" specifies the number of figures).

Please refer to EncodedFile for filename conventions.

This property is read-only.

FileName Property (NetCode Component)

This property includes the destination filename for the encoded data.

Syntax

• C#
• VB.NET

public string FileName { get; set; }

Public Property FileName As String

Default Value

""

Remarks

This property contains the destination filename for the encoded data. When uuencoding, this property contains the filename that is specified in the uuencoded data.

When decoding, if the value of the property is not empty, it shows the component where to write the decoded data. It can be either the filename or the directory where the file should be written. If is should be written to a directory, it should end with a backslash "\".

After a decode operation, this property contains the filename for the created file. If the file couldn't be created because of an illegal filename, examining this property might provide a hint about the reason of the failure.

This property must be set to "" (empty string) after each decode operation because it contains the full specification of the file.

An error occurs if a uuencoding operation is initiated with an empty FileName.

If you want to first check the uuencoded filename before creating it on disk, you may assign an illegal directory name to this property (always use a closing backslash "\" to denote it as a directory), then trap the error and check the filename appended to this property.

Format Property (NetCode Component)

This property includes the type of encoding to be used.

Syntax

• C#
• VB.NET

public NetCodeFormats Format { get; set; }

enum NetCodeFormats {
  fmtUUEncode,
  fmtBase64,
  fmtQP,
  fmtURL,
  fmtJIS,
  fmtYEncode,
  fmtMD5Hash,
  fmtSHA1Hash,
  fmtHex,
  fmtHTML,
  fmtHMAC,
  fmtUTF8,
  fmtUTF7,
  fmtBase32,
  fmtBase64URL,
  fmtSHA256Hash,
  fmtPunycode
}

Public Property Format As NetcodeFormats

Enum NetCodeFormats
  fmtUUEncode
  fmtBase64
  fmtQP
  fmtURL
  fmtJIS
  fmtYEncode
  fmtMD5Hash
  fmtSHA1Hash
  fmtHex
  fmtHTML
  fmtHMAC
  fmtUTF8
  fmtUTF7
  fmtBase32
  fmtBase64URL
  fmtSHA256Hash
  fmtPunycode
End Enum

Default Value

0

Remarks

This property contains the type of encoding to be used. The following are the possible values for this property, and the corresponding descriptions:

Mode Property (NetCode Component)

This property includes the UNIX-style filemode when uuencoding and uudecoding.

Syntax

• C#
• VB.NET

public string Mode { get; set; }

Public Property Mode As String

Default Value

"0755"

Remarks

This property contains the UNIX-style filemode when uuencoding and uudecoding. The filemode is usually an octal number, such as 755 or 600, which gives the protections of that file. If the file to uudecode is correctly read, then this property contains the protection string given in the uuencoded data.

This is given for compatibility with other systems and is used only when Format is fmtUUE.

Overwrite Property (NetCode Component)

This property controls whether created file(s) should overwrite already existing file(s).

Syntax

• C#
• VB.NET

public bool Overwrite { get; set; }

Public Property Overwrite As Boolean

Default Value

False

Remarks

This property controls whether created file(s) should overwrite already existing file(s).

Note: More than one file may be created during uuencoding.

ProgressStep Property (NetCode Component)

This property controls the granularity at which the Progress event is fired. Values are 0-100.

Syntax

• C#
• VB.NET

public int ProgressStep { get; set; }

Public Property ProgressStep As Integer

Default Value

1

Remarks

This property controls the granularity at which the Progress event is fired. Values are 0-100. If this property is not 0, the Progress event will be fired when 0%, n* ProgressStep and 100% of input data are read.

If this property is 0, the Progress event is disabled.

Config Method (NetCode 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.

Decode Method (NetCode Component)

This method decodes a string.

Syntax

• C#
• VB.NET

public void Decode();

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

Public Sub Decode()

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

Remarks

This method decodes according to the Format type. The component will decode the data in the input stream if SetInputStream has been set to a valid stream. If this stream is null, the component will then try to read the data from the file set by the EncodedFile property. If no valid file has been specified, the component will use the EncodedData property.

The resulting decoded data are written to the output stream if one has been set. If not, the component will attempt to write the decoded data to the DecodedFile. If no file was specified, the decoded data may be retrieved through the DecodedData property.

When UUDecoding the created filename will by default be the one specified in the uuencoded data. The FileName property will contain this value. DecodedFile or, if DecodedFile is empty, FileName can be used to override this value.

When YDecoding, the source path and filename is specified in EncodedFile and the destination path and filename in DecodedFile. If the encoded data indicate the name of the original file before decoding, this value will be stored in the FileName property. To decode a multipart message, all parts must be concatenated in order in the source file.

Encode Method (NetCode Component)

This method encodes the data.

Syntax

• C#
• VB.NET

public void Encode();

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

Public Sub Encode()

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

Remarks

This method encodes the data according to the Format type. The component will encode the data in the input stream if SetInputStream has been set to a valid stream. If this stream is null, the component will then try to read the data from the file set by the DecodedFile property. If no valid file has been specified, the component will use the DecodedData property.

The resulting encoded data are written to the output stream if one has been set. If not, the component will attempt to write the encoded data to the EncodedFile. If no file was specified, the encoded data may be retrieved through the EncodedData property.

The data are considered binary while uuencoding and Base64 Formats, and text during QuotedPrintable ones.

When uuencoding or yencoding, the filename encoded into the data is taken from the FileName property.

The current version of NetCode does not create message headers. If a MIME standard encoding is used, such as Base64 Encoding or Quoted Printable Encoding, the user should fill the header values appropriately.

If EncodedFile and MaxFileSize is set and the encoded data take more space than MaxFileSize, the data are split over several files. In this case, the user can specify more than one filename by passing them to EncodedFile in the form name?. The filenames should exist as path\file0.ext, path\file1.ext ... Question marks "?" are expanded to numerals starting with 0. NetCode appends the extension ".uue", ".b16", or ".q_p" (depending on the value of Format) to the filename.

Reset Method (NetCode Component)

This method will reset the component.

Syntax

• C#
• VB.NET

public void Reset();

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

Public Sub Reset()

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

Remarks

This method will reset the component's properties to their default values.

ResetData Method (NetCode Component)

This method resets the values of all data and stream properties.

Syntax

• C#
• VB.NET

public void ResetData();

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

Public Sub ResetData()

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

Remarks

This method resets the values of all data and stream properties. It is an easy way to reset the component's properties before another call to Encode or Decode. The input and output streams and the data and file properties will all be reset.

SetInputStream Method (NetCode Component)

This method sets the input stream of data.

Syntax

• C#
• VB.NET

public void SetInputStream(System.IO.Stream inputStream);

Async Version
public async Task SetInputStream(System.IO.Stream inputStream);
public async Task SetInputStream(System.IO.Stream inputStream, CancellationToken cancellationToken);

Public Sub SetInputStream(ByVal InputStream As System.IO.Stream)

Async Version
Public Sub SetInputStream(ByVal InputStream As System.IO.Stream) As Task
Public Sub SetInputStream(ByVal InputStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

Use this method to set the input stream of data for the component to read from. If Encode or Decode is called, and this is not null, the data will be read from this stream when the specified action occurs. You may reset this by calling ResetData.

SetOutputStream Method (NetCode Component)

This method sets the output stream of data.

Syntax

• C#
• VB.NET

public void SetOutputStream(System.IO.Stream outputStream);

Async Version
public async Task SetOutputStream(System.IO.Stream outputStream);
public async Task SetOutputStream(System.IO.Stream outputStream, CancellationToken cancellationToken);

Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream)

Async Version
Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream) As Task
Public Sub SetOutputStream(ByVal OutputStream As System.IO.Stream, cancellationToken As CancellationToken) As Task

Remarks

Use this method to set the output stream of data for the component to write. If Encode or Decode is called, and this is not null, the data will be written to this stream when the specified action occurs. You may reset this by calling ResetData.

Error Event (NetCode 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, NetCodeErrorEventArgs e);

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

Public Event OnError As OnErrorHandler

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

Public Class NetCodeErrorEventArgs 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.

Progress Event (NetCode Component)

This event occurs when PercentDone of the input is read.

Syntax

• C#
• VB.NET

public event OnProgressHandler OnProgress;

public delegate void OnProgressHandler(object sender, NetCodeProgressEventArgs e);

public class NetCodeProgressEventArgs : EventArgs {
  public int PercentDone { get; }
}

Public Event OnProgress As OnProgressHandler

Public Delegate Sub OnProgressHandler(sender As Object, e As NetCodeProgressEventArgs)

Public Class NetCodeProgressEventArgs Inherits EventArgs
  Public ReadOnly Property PercentDone As Integer
End Class

Remarks

The ProgressStep property determines how often the event is fired.

Config Settings (NetCode Component)

NetCode Config Settings

Base Config Settings

Trappable Errors (NetCode Component)

NetCode Errors