Bz2 DataFlex Reference Documentation

Bz2

Provides the ability to create and unzip .bz2 compressed files using the BZip2 compression algorithm.

Object Creation

Handle hoBz2
Get Create(RefClass(cComChilkatBz2)) to hoBz2

Properties

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.)

Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

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.

Function ComLastBinaryResult Returns Variant

Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

Function ComLastErrorHtml Returns String

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.

Function ComLastErrorText Returns String

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.

Concept of LastErrorText

LastErrorText Standard Information

Function ComLastErrorXml Returns String

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.

Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value

Introduced in version 9.5.0.52

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.

Function ComLastStringResult Returns String

Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

Long Strings Returned by ActiveX Methods in SQL Server

Function ComLastStringResultLen Returns Integer

Introduced in version 9.5.0.53

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

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.

Function ComVersion Returns String

Version of the component/library, such as "9.5.0.63"

Methods

Function ComCompressFile String inFilename String toPath Returns Boolean

Compresses a file to create a BZip2 compressed file (.bz2).

Returns True for success, False for failure.

Function ComCompressFileAsync String inFilename String toPath Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComCompressFileToMem String inFilename Returns Variant

BZip2 compresses a file to an in-memory image of a .bz2 file.

Returns null on failure

Function ComCompressFileToMemAsync String inFilename Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComCompressMemory Variant inData Returns Variant

Compresses in-memory data to an in-memory image of a .bz2 file.

Returns null on failure

Function ComCompressMemoryAsync Variant inData Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComCompressMemToFile Variant inData String toPath Returns Boolean

BZip2 compresses and creates a .bz2 file from in-memory data.

Returns True for success, False for failure.

Function ComCompressMemToFileAsync Variant inData String toPath Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComUncompressFile String inFilename String toPath Returns Boolean

Unzips a .bz2 file.

Returns True for success, False for failure.

Function ComUncompressFileAsync String inFilename String toPath Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComUncompressFileToMem String inFilename Returns Variant

Unzips a .bz2 file directly to memory.

Returns null on failure

Function ComUncompressFileToMemAsync String inFilename Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComUncompressMemory Variant inData Returns Variant

Unzips from an in-memory image of a .bz2 file directly into memory.

Returns null on failure

Function ComUncompressMemoryAsync Variant inData Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComUncompressMemToFile Variant inData String toPath Returns Boolean

Unzips from an in-memory image of a .bz2 file to a file.

Returns True for success, False for failure.

Function ComUncompressMemToFileAsync Variant inData String toPath Returns cComChilkatTask

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

Returns null on failure

How to Run an Asynchronous Task

Function ComUnlockComponent String regCode Returns Boolean

Unlocks the component allowing for the full functionality to be used. If a purchased unlock code is passed, there is no expiration. Any other string automatically begins a fully-functional 30-day trial the first time UnlockComponent is called.

Returns True for success, False for failure.

Diagnosing UnlockComponent Problems

UnlockComponent LastErrorText shows exact string passed to it.

Verify UnlockComponent Success w/ Permanent Unlock Code

LastErrorText Standard Information