UnixCompress DataFlex Reference Documentation

UnixCompress

Current Version: 10.1.2

Requires Chilkat Bundle License

UNIX (.Z) compression component.

Object Creation

// (Dataflex programs use the 32-bit Chilkat ActiveX)
Handle hoUnixCompress
Get Create(RefClass(cComUnixCompress)) to hoUnixCompress

Properties

AbortCurrent

Function ComAbortCurrent Returns Boolean
Procedure Set ComAbortCurrent Boolean value

Introduced in version 9.5.0.58

When set to True, causes the currently running method to abort. Methods that always finish quickly (i.e.have no length file operations or network communications) are not affected. If no method is running, then this property is automatically reset to False when the next method is called. When the abort occurs, this property is reset to False. Both synchronous and asynchronous method calls can be aborted. (A synchronous method call could be aborted by setting this property from a separate thread.)

DebugLogFilePath

Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.

Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.

Possible causes of hangs include:

A timeout property set to 0, indicating an infinite timeout.
A hang occurring within an event callback in the application code.
An internal bug in the Chilkat code causing the hang.

More Information and Examples

Example showing how to use DebugLogFilePath.

LastBinaryResult

Function ComLastBinaryResult Returns Variant

This property is mainly used in SQL Server stored procedures to retrieve binary data from the last method call that returned binary data. It is only accessible if Chilkat.Global.KeepBinaryResult is set to True. This feature allows for the retrieval of large varbinary results in an SQL Server environment, which has restrictions on returning large data via method calls, though temp tables can handle binary properties.

LastErrorHtml

Function ComLastErrorHtml Returns String

Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

LastErrorText

Function ComLastErrorText Returns String

Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

More Information and Examples

Concept of LastErrorText LastErrorText Standard Information

LastErrorXml

Function ComLastErrorXml Returns String

Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

LastMethodSuccess

Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value

Indicates the success or failure of the most recent method call: True means success, False means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.

LastStringResult

Function ComLastStringResult Returns String

In SQL Server stored procedures, this property holds the string return value of the most recent method call that returns a string. It is accessible only when Chilkat.Global.KeepStringResult is set to TRUE. SQL Server has limitations on string lengths returned from methods and properties, but temp tables can be used to access large strings.

More Information and Examples

Long Strings Returned by ActiveX Methods in SQL Server

LastStringResultLen

Function ComLastStringResultLen Returns Integer

The length, in characters, of the string contained in the LastStringResult property.

VerboseLogging

Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

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.

Version

Function ComVersion Returns String

Version of the component/library, such as "10.1.0"

More Information and Examples

How to get the Chilkat version at runtime.

Methods

CompressFile

Function ComCompressFile String inFilename String destPath Returns Boolean

Compresses a file to create a UNIX compressed file (.Z). This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.

Returns True for success, False for failure.

CompressFileAsync ⁽¹⁾

Function ComCompressFileAsync String inFilename String destPath Returns cComChilkatTask

Creates an asynchronous task to call the CompressFile method with the arguments provided.

Returns null on failure

CompressFileToMem

Function ComCompressFileToMem String inFilename Returns Variant

Unix compresses a file to an in-memory image of a .Z file. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns null on failure

CompressFileToMemAsync ⁽¹⁾

Function ComCompressFileToMemAsync String inFilename Returns cComChilkatTask

Creates an asynchronous task to call the CompressFileToMem method with the arguments provided.

Returns null on failure

CompressMemory

Function ComCompressMemory Variant inData Returns Variant

Compresses in-memory data to an in-memory image of a .Z file. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns null on failure

CompressMemToFile

Function ComCompressMemToFile Variant inData String destPath Returns Boolean

Unix compresses and creates a .Z file from in-memory data. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns True for success, False for failure.

CompressString

Function ComCompressString String inStr String charset Returns Variant

Compresses a string to an in-memory image of a .Z file. Prior to compression, the string is converted to the character encoding specified by charset. The charset can be any one of a large number of character encodings, such as "utf-8", "iso-8859-1", "Windows-1252", "ucs-2", etc.

Returns null on failure

More Information and Examples

List of Valid Charsets

CompressStringToFile

Function ComCompressStringToFile String inStr String charset String destPath Returns Boolean

Unix compresses and creates a .Z file from string data. The charset specifies the character encoding used for the byte representation of the characters when compressed. The charset can be any one of a large number of character encodings, such as "utf-8", "iso-8859-1", "Windows-1252", "ucs-2", etc.

Returns True for success, False for failure.

More Information and Examples

List of Valid Charsets

LoadTaskCaller

Function ComLoadTaskCaller cComChilkatTask task Returns Boolean

Introduced in version 9.5.0.80

Loads the caller of the task's async method.

Returns True for success, False for failure.

ReadFile

Function ComReadFile String filename Returns Variant

Convenience method to read an entire file and return as a byte array.

Returns null on failure

UncompressFile

Function ComUncompressFile String inFilename String destPath Returns Boolean

Uncompresses a .Z file. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns True for success, False for failure.

UncompressFileAsync ⁽¹⁾

Function ComUncompressFileAsync String inFilename String destPath Returns cComChilkatTask

Creates an asynchronous task to call the UncompressFile method with the arguments provided.

Returns null on failure

UncompressFileToMem

Function ComUncompressFileToMem String inFilename Returns Variant

Uncompresses a .Z file directly to memory. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns null on failure

UncompressFileToMemAsync ⁽¹⁾

Function ComUncompressFileToMemAsync String inFilename Returns cComChilkatTask

Creates an asynchronous task to call the UncompressFileToMem method with the arguments provided.

Returns null on failure

UncompressFileToString

Function ComUncompressFileToString String zFilename String charset Returns String

Uncompresses a .Z file that contains a text file. The contents of the text file are returned as a string. The character encoding of the text file is specified by charset. Typical charsets are "iso-8859-1", "utf-8", "windows-1252", "shift_JIS", "big5", etc.

Returns null on failure

More Information and Examples

List of Valid Charsets

UncompressFileToStringAsync ⁽¹⁾

Function ComUncompressFileToStringAsync String zFilename String charset Returns cComChilkatTask

Creates an asynchronous task to call the UncompressFileToString method with the arguments provided.

Returns null on failure

UncompressMemory

Function ComUncompressMemory Variant inData Returns Variant

Uncompresses from an in-memory image of a .Z file directly into memory. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns null on failure

UncompressMemToFile

Function ComUncompressMemToFile Variant inData String destPath Returns Boolean

Uncompresses from an in-memory image of a .Z file to a file. (This compression uses the LZW (Lempel-Ziv-Welch) compression algorithm.)

Returns True for success, False for failure.

UncompressString

Function ComUncompressString Variant inCompressedData String charset Returns String

Uncompresses from an in-memory image of a .Z file directly to a string. The charset specifies the character encoding used to interpret the bytes resulting from the decompression. The charset can be any one of a large number of character encodings, such as "utf-8", "iso-8859-1", "Windows-1252", "ucs-2", etc.

Returns null on failure

More Information and Examples

List of Valid Charsets

UnTarZ

Function ComUnTarZ String zFilename String destDir Boolean bNoAbsolute Returns Boolean

Unpacks a .tar.Z file. The decompress and untar occur in streaming mode. There are no temporary files and the memory footprint is constant (and small) while untarring.

Returns True for success, False for failure.

UnTarZAsync ⁽¹⁾

Function ComUnTarZAsync String zFilename String destDir Boolean bNoAbsolute Returns cComChilkatTask

Creates an asynchronous task to call the UnTarZ method with the arguments provided.

Returns null on failure

WriteFile

Function ComWriteFile String filename Variant binaryData Returns Boolean

Convenience method for writing the contents of a byte array to a file.

Returns True for success, False for failure.