ZipEntry Xojo Plugin Reference Documentation

ZipEntry

Current Version: 9.5.0.97

Represents a single file or directory entry within a Chilkat Zip object. A zip entry can be one of 5 types (see the description of the EntryType property below).

Object Creation

Dim zipEntry As New Chilkat.ZipEntry

Properties

Comment
Comment As String

The comment stored within the Zip for this entry.

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CompressedLength
CompressedLength As UInt32 (read-only)

The size in bytes of this entry's file data when compression is applied

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CompressedLength64
CompressedLength64 As Int64 (read-only)

The size in bytes of this entry's file data when compression is applied

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CompressionLevel
CompressionLevel As Int32

The compression level. 0 = no compression, while 9 = maximum compression. The default is 6.

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CompressionMethod
CompressionMethod As Int32

Set to 0 for no compression, or 8 for the Deflate algorithm. The Deflate algorithm is the default algorithm of the most popular Zip utility programs, such as WinZip

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Crc
Crc As Int32 (read-only)

The CRC for the zip entry. For AES encrypted entries, the CRC value will be 0. (See http://www.winzip.com/aes_info.htm#CRC )

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DebugLogFilePath
DebugLogFilePath As String

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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EncryptionKeyLen
EncryptionKeyLen As Int32 (read-only)
Introduced in version 9.5.0.69

If this entry is AES encrypted, then this property contains the AES key length (128, 192, or 256). If the entry is not AES encrypted, then the value is 0.

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EntryID
EntryID As Int32 (read-only)

A unique ID assigned to the entry while the object is instantiated in memory.

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EntryType
EntryType As Int32 (read-only)

Indicates the origin of the entry. There are three possible values:

  1. Mapped Entry: An entry in an existing Zip file.
  2. File Entry: A file not yet in memory, but referenced. These entries are added by calling AppendFiles, AppendFilesEx, AppendOneFileOrDir, etc.
  3. Data Entry: An entry containing uncompressed data from memory. These entries are added by calling AppendData, AppendString, etc.
  4. Null Entry: An entry that no longer exists in the .zip.
  5. New Directory Entry: A directory entry added by calling AppendNewDir.
When the zip is written by calling WriteZip or WriteToMemory, all of the zip entries are transformed into mapped entries. They become entries that contain the compressed data within the .zip that was just created. (The WriteZip method call effectively writes the zip and then opens it, replacing all of the existing entries with mapped entries.)

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FileDateTimeStr
FileDateTimeStr As String

The local last-modified date/time in RFC822 string format.

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FileName
FileName As String

The file name of the Zip entry.

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FileNameHex
FileNameHex As String (read-only)

A string containing the hex encoded raw filename bytes found in the Zip entry.

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HeartbeatMs
HeartbeatMs As Int32

The number of milliseconds between each AbortCheck event callback. The AbortCheck callback allows an application to abort inflate/extract/unzip calls prior to completion. If HeartbeatMs is 0 (the default), no AbortCheck event callbacks will fire.

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IsAesEncrypted
IsAesEncrypted As Boolean (read-only)
Introduced in version 9.5.0.69

True if the entry is AES encrypted. This property can only be True for entries already contained in a .zip (i.e. entries obtained from a zip archive that was opened via OpenZip, OpenBd, OpenFromMemory, etc.) The property is False if the entry contained in the zip is not AES encrypted.

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IsDirectory
IsDirectory As Boolean (read-only)

True if the Zip entry is a directory, false if it is a file.

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LastErrorHtml
LastErrorHtml As String (read-only)

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
LastErrorText As String (read-only)

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorXml
LastErrorXml As String (read-only)

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
LastMethodSuccess As Boolean

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = True and failure = False.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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TextFlag
TextFlag As Boolean

Controls whether the "text flag" of the internal file attributes for this entry within the zip is set. This is a bit flag that indicates whether the file contents are text or binary. It is for informational use and it is not imperative that this bit flag is accurately set. The ability to set this bit flag is only provided to satisfy certain cases where another application might be sensitive to the flag.

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UncompressedLength
UncompressedLength As UInt32 (read-only)

The size in bytes of this entry's file data when uncompressed.

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UncompressedLength64
UncompressedLength64 As Int64 (read-only)

The size in bytes of this entry's file data when uncompressed.

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VerboseLogging
VerboseLogging As Boolean

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As String (read-only)

Version of the component/library, such as "9.5.0.94"

More Information and Examples
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Methods

AppendData
Function AppendData(inData As MemoryBlock) As Boolean

Appends binary data to the zip entry's file contents.

Returns True for success, False for failure.

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AppendDataAsync (1)
Function AppendDataAsync(inData As MemoryBlock) As Chilkat.Task

Creates an asynchronous task to call the AppendData method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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AppendString
Function AppendString(strContent As String, charset As String) As Boolean

Appends text data to the zip entry's file contents. The text is appended using the character encoding specified by the charset, which can be "utf-8", "ansi", etc.

Returns True for success, False for failure.

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AppendStringAsync (1)
Function AppendStringAsync(strContent As String, charset As String) As Chilkat.Task

Creates an asynchronous task to call the AppendString method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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Copy
Function Copy() As MemoryBlock

Returns the compressed data as a byte array.

Note: The Copy method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry"). This is the case when an existing .zip is opened (from memory or from a file), or after the .zip has been written (by calling WriteZip or WriteToMemory). If a zip entry is created via AppendData, AppendFiles, etc., then it does not yet contain compressed data. When the zip is written, each entry becomes a "mapped entry" (The value of the EntryType property becomes 0.)

Returns Nil on failure

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CopyToBase64
Function CopyToBase64() As String

Returns the compressed data as a Base64-encoded string. It is only possible to retrieve the compressed data from a pre-existing .zip that has been opened or after writing the .zip but not closing it.

Note: The CopyToBase64 method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry").

Returns Nil on failure

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CopyToHex
Function CopyToHex() As String

Returns the compressed data as a hexidecimal encoded string. It is only possible to retrieve the compressed data from a pre-existing .zip that has been opened or after writing the .zip but not closing it.

Note: The CopyToBase64 method can only be called if the zip entry already contains compressed data (i.e. it is a "mapped entry").

Returns Nil on failure

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Extract
Function Extract(dirPath As String) As Boolean

Unzips this entry into the specified base directory. The file is unzipped to the subdirectory according to the relative path stored with the entry in the Zip. Use ExtractInto to unzip into a specific directory regardless of the path information stored in the Zip.

Returns True for success, False for failure.

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ExtractAsync (1)
Function ExtractAsync(dirPath As String) As Chilkat.Task

Creates an asynchronous task to call the Extract method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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ExtractInto
Function ExtractInto(dirPath As String) As Boolean

Unzip a file into a specific directory. If this entry is a directory, then nothing occurs. (An application can check the IsDirectory property and instead call Extract if it is desired to create the directory. )

Returns True for success, False for failure.

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ExtractIntoAsync (1)
Function ExtractIntoAsync(dirPath As String) As Chilkat.Task

Creates an asynchronous task to call the ExtractInto method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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GetDt
Function GetDt() As Chilkat.CkDateTime

Returns the last-modified date/time of this zip entry.

Returns Nil on failure

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Inflate
Function Inflate() As MemoryBlock

Inflate a file within a Zip directly into memory.

Returns Nil on failure

More Information and Examples
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InflateAsync (1)
Function InflateAsync() As Chilkat.Task

Creates an asynchronous task to call the Inflate method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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LoadTaskCaller
Function LoadTaskCaller(task As Chilkat.Task) As Boolean
Introduced in version 9.5.0.80

Loads the caller of the task's async method.

Returns True for success, False for failure.

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NextEntry
Function NextEntry() As Chilkat.ZipEntry

Return the next entry (file or directory) within the Zip

Returns Nil on failure

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NextMatchingEntry
Function NextMatchingEntry(matchStr As String) As Chilkat.ZipEntry
Introduced in version 9.5.0.50

Returns the next entry having a filename matching the matchStr. The "*" characters matches 0 or more of any character. The full filename, including path, is used when matching against the pattern.

Returns Nil on failure

More Information and Examples
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ReplaceData
Function ReplaceData(inData As MemoryBlock) As Boolean

Replaces the zip entry's existing contents with new data.

Returns True for success, False for failure.

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ReplaceString
Function ReplaceString(strContent As String, charset As String) As Boolean

Replaces the zip entry's existing contents with new text data. The text will be stored using the character encoding as specified by charset, which can be "utf-8", "ansi", etc.

Returns True for success, False for failure.

More Information and Examples
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SetDt
Sub SetDt(dt As Chilkat.CkDateTime)

Sets the last-modified date/time for this zip entry.

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UnzipToBd
Function UnzipToBd(binData As Chilkat.BinData) As Boolean
Introduced in version 9.5.0.67

Unzips the entry contents into the binData.

Returns True for success, False for failure.

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UnzipToBdAsync (1)
Function UnzipToBdAsync(binData As Chilkat.BinData) As Chilkat.Task
Introduced in version 9.5.0.67

Creates an asynchronous task to call the UnzipToBd method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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UnzipToSb
Function UnzipToSb(lineEndingBehavior As Int32, srcCharset As String, sb As Chilkat.StringBuilder) As Boolean
Introduced in version 9.5.0.67

Unzips a text file to the sb. The contents of sb are appended with the unzipped file. The lineEndingBehavior is as follows:

0 = leave unchanged.
1 = convert all to bare LF's
2 = convert all to CRLF's

The srcCharset tells the component how to interpret the bytes of the uncompressed file -- i.e. as utf-8, utf-16, windows-1252, etc.

Returns True for success, False for failure.

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UnzipToSbAsync (1)
Function UnzipToSbAsync(lineEndingBehavior As Int32, srcCharset As String, sb As Chilkat.StringBuilder) As Chilkat.Task
Introduced in version 9.5.0.67

Creates an asynchronous task to call the UnzipToSb method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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UnzipToStream
Function UnzipToStream(toStream As Chilkat.Stream) As Boolean
Introduced in version 9.5.0.67

Unzips a file within a Zip to a stream. If called synchronously, the toStream must have a sink, such as a file or another stream object. If called asynchronously, then the foreground thread can read the stream.

Returns True for success, False for failure.

More Information and Examples
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UnzipToStreamAsync (1)
Function UnzipToStreamAsync(toStream As Chilkat.Stream) As Chilkat.Task
Introduced in version 9.5.0.67

Creates an asynchronous task to call the UnzipToStream method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

More Information and Examples
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UnzipToString
Function UnzipToString(lineEndingBehavior As Int32, srcCharset As String) As String

Inflate and return the uncompressed data as a string The lineEndingBehavior is as follows:

0 = leave unchanged.
1 = convert all to bare LF's
2 = convert all to CRLF's

The srcCharset tells the component how to interpret the bytes of the uncompressed file -- i.e. as utf-8, utf-16, windows-1252, etc.

Returns Nil on failure

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UnzipToStringAsync (1)
Function UnzipToStringAsync(lineEndingBehavior As Int32, srcCharset As String) As Chilkat.Task

Creates an asynchronous task to call the UnzipToString method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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Events

To implement events, your application would define and implement a class that is a subclass of Chilkat.ZipEntry. Your custom class would implement (i.e. override) some or all of the event methods.

For example:

class MyZipEntry
    Inherits Chilkat.ZipEntry

    Function AbortCheck() As Boolean

    Function PercentDone(pctDone As Int32) As Boolean

    Sub ProgressInfo(name As String, value As String)

    Sub TaskCompleted(task As Chilkat.Task)


End Class
AbortCheck
Function AbortCheck() As Boolean

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

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PercentDone
Function PercentDone(pctDone As Int32) As Boolean

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to True will cause the method to abort and return a failed status (or whatever return value indicates failure).

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ProgressInfo
Sub ProgressInfo(name As String, value As String)

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

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TaskCompleted
Sub TaskCompleted(task As Chilkat.Task)

Called in the background thread when an asynchronous task completes.

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