CkUnixCompressW Unicode C++ Reference Documentation

CkUnixCompressW

Current Version: 9.5.0.73

UNIX (.Z) compression component.

Object Creation

// Local variable on the stack
CkUnixCompressW obj;

// Dynamically allocate/delete
CkUnixCompressW *pObj = new CkUnixCompressW();
// ...
delete pObj;

Properties

AbortCurrent
bool get_AbortCurrent(void);
void put_AbortCurrent(bool newVal);
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.)

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DebugLogFilePath
void get_DebugLogFilePath(CkString &str);
const wchar_t *debugLogFilePath(void);
void put_DebugLogFilePath(const wchar_t *str);

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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HeartbeatMs
int get_HeartbeatMs(void);
void put_HeartbeatMs(int newVal);

The number of milliseconds between each AbortCheck event callback. The AbortCheck callback allows an application to abort any method call prior to completion. If HeartbeatMs is 0 (the default), no AbortCheck event callbacks will fire.

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LastErrorHtml
void get_LastErrorHtml(CkString &str);
const wchar_t *lastErrorHtml(void);

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
void get_LastErrorText(CkString &str);
const wchar_t *lastErrorText(void);

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
void get_LastErrorXml(CkString &str);
const wchar_t *lastErrorXml(void);

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
bool get_LastMethodSuccess(void);
void put_LastMethodSuccess(bool newVal);
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.

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VerboseLogging
bool get_VerboseLogging(void);
void put_VerboseLogging(bool newVal);

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
void get_Version(CkString &str);
const wchar_t *version(void);

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

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Methods

CompressFile
bool CompressFile(const wchar_t *inFilename, const wchar_t *destPath);

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.

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CompressFileAsync (1)
CkTaskW *CompressFileAsync(const wchar_t *inFilename, const wchar_t *destPath);

Creates an asynchronous task to call the CompressFile 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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CompressFileToMem
bool CompressFileToMem(const wchar_t *inFilename, CkByteData &outData);
const wchar_t *compressFileToMem(const wchar_t *inFilename);

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

Returns true for success, false for failure.

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CompressFileToMemAsync (1)
CkTaskW *CompressFileToMemAsync(const wchar_t *inFilename);

Creates an asynchronous task to call the CompressFileToMem 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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CompressMemory
bool CompressMemory(const void *inData, CkByteData &outData);
const wchar_t *compressMemory(const void *inData);

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

Returns true for success, false for failure.

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CompressMemToFile
bool CompressMemToFile(const void *inData, const wchar_t *destPath);

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.

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CompressString
bool CompressString(const wchar_t *inStr, const wchar_t *charset, CkByteData &outBytes);
const wchar_t *compressString(const wchar_t *inStr, const wchar_t *charset);

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 true for success, false for failure.

More Information and Examples
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CompressStringToFile
bool CompressStringToFile(const wchar_t *inStr, const wchar_t *charset, const wchar_t *destPath);

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
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IsUnlocked
bool IsUnlocked(void);

Returns true if the component has been unlocked. (For ActiveX, returns 1 if unlocked.)

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SaveLastError
bool SaveLastError(const wchar_t *path);

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns true for success, false for failure.

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UncompressFile
bool UncompressFile(const wchar_t *inFilename, const wchar_t *destPath);

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

Returns true for success, false for failure.

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UncompressFileAsync (1)
CkTaskW *UncompressFileAsync(const wchar_t *inFilename, const wchar_t *destPath);

Creates an asynchronous task to call the UncompressFile 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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UncompressFileToMem
bool UncompressFileToMem(const wchar_t *inFilename, CkByteData &outData);
const wchar_t *uncompressFileToMem(const wchar_t *inFilename);

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

Returns true for success, false for failure.

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UncompressFileToMemAsync (1)
CkTaskW *UncompressFileToMemAsync(const wchar_t *inFilename);

Creates an asynchronous task to call the UncompressFileToMem 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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UncompressFileToString
bool UncompressFileToString(const wchar_t *zFilename, const wchar_t *charset, CkString &outStr);
const wchar_t *uncompressFileToString(const wchar_t *zFilename, const wchar_t *charset);

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 true for success, false for failure.

More Information and Examples
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UncompressFileToStringAsync (1)
CkTaskW *UncompressFileToStringAsync(const wchar_t *zFilename, const wchar_t *charset);

Creates an asynchronous task to call the UncompressFileToString 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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UncompressMemory
bool UncompressMemory(const void *inData, CkByteData &outData);
const wchar_t *uncompressMemory(const void *inData);

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

Returns true for success, false for failure.

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UncompressMemToFile
bool UncompressMemToFile(const void *inData, const wchar_t *destPath);

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.

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UncompressString
bool UncompressString(const void *inCompressedData, const wchar_t *charset, CkString &outStr);
const wchar_t *uncompressString(const void *inCompressedData, const wchar_t *charset);

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 true for success, false for failure.

More Information and Examples
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UnlockComponent
bool UnlockComponent(const wchar_t *unlockCode);

Unlocks the component allowing for the full functionality to be used.

Returns true for success, false for failure.

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UnTarZ
bool UnTarZ(const wchar_t *zFilename, const wchar_t *destDir, bool bNoAbsolute);

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.

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UnTarZAsync (1)
CkTaskW *UnTarZAsync(const wchar_t *zFilename, const wchar_t *destDir, bool bNoAbsolute);

Creates an asynchronous task to call the UnTarZ 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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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Events

To implement an event callback, your application would define and implement a class that inherits from CkBaseProgressW. Your application can implement methods to override some or all of the default/empty method implementations of the CkBaseProgressW base class.

For example:

  CkUnixCompressW unixcompress;

  MyUnixCompressProgressW callbackObj;

  unixcompress.put_EventCallbackObject(&callbackObj);

MyUnixCompressProgressW example:

#include "CkBaseProgressW.h"

class MyUnixCompressProgressW : public CkBaseProgressW {

  public:
    MyUnixCompressProgressW();
    virtual ~MyUnixCompressProgressW();

    void AbortCheck(bool  *abort);

    void BinaryData(const unsigned char *data, unsigned int length);

    void PercentDone(int pctDone, bool  *abort);

    void ProgressInfo(const wchar_t *name, const wchar_t *value);

    void TaskCompleted(CkTaskW &task);

    void TextData(const wchar_t *data);

};
AbortCheck
void AbortCheck(bool *abort);

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
void PercentDone(int pctDone, bool *abort);

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
void ProgressInfo(const wchar_t *name, const wchar_t *value);

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
void TaskCompleted(CkTaskW &task);

Called in the background thread when an asynchronous task completes.

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