CkZipCrc Python Reference Documentation

CkZipCrc

Current Version: 9.5.0.97

Calculate a Zip CRC checksum for a file or in-memory data.

Object Creation

obj = chilkat.CkZipCrc()

Properties

DebugLogFilePath
# strVal is a string
# ckStr is a CkString
zipCrc.get_DebugLogFilePath(ckStr);
strVal = zipCrc.debugLogFilePath();
zipCrc.put_DebugLogFilePath(strVal);

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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LastErrorHtml
# strVal is a string
# ckStr is a CkString
zipCrc.get_LastErrorHtml(ckStr);
strVal = zipCrc.lastErrorHtml();

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
# strVal is a string
# ckStr is a CkString
zipCrc.get_LastErrorText(ckStr);
strVal = zipCrc.lastErrorText();

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
# strVal is a string
# ckStr is a CkString
zipCrc.get_LastErrorXml(ckStr);
strVal = zipCrc.lastErrorXml();

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
# boolVal is a boolean
boolVal = zipCrc.get_LastMethodSuccess();
zipCrc.put_LastMethodSuccess(boolVal);

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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Utf8
# boolVal is a boolean
boolVal = zipCrc.get_Utf8();
zipCrc.put_Utf8(boolVal);

When set to True, all "const char *" arguments are interpreted as utf-8 strings. If set to False (the default), then "const char *" arguments are interpreted as ANSI strings. Also, when set to True, and Chilkat method returning a "const char *" is returning the utf-8 representation. If set to False, all "const char *" return values are ANSI strings.

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VerboseLogging
# boolVal is a boolean
boolVal = zipCrc.get_VerboseLogging();
zipCrc.put_VerboseLogging(boolVal);

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
# strVal is a string
# ckStr is a CkString
zipCrc.get_Version(ckStr);
strVal = zipCrc.version();

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

More Information and Examples
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Methods

BeginStream
zipCrc.BeginStream();

Provides a way to calculate a CRC by streaming the data a chunk at a time. An application would start by calling BeginStream. Then it would add data by calling MoreData for each additional chunk. After the last chunk has been processed, the EndStream method is called to return the CRC.

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CalculateCrc
# data is a CkByteData
retInt = zipCrc.CalculateCrc(data);

Calculates a 32-bit CRC for in-memory byte data. This is the 32-bit CRC that would be found in a Zip file header if a file containing the data was added to a zip archive. Returns the CRC32 of the data.

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CrcBd
# bd is a CkBinData
retInt = zipCrc.CrcBd(bd);
Introduced in version 9.5.0.75

Calculates a CRC32 for the bytes contained in bd.

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CrcSb
# sb is a CkStringBuilder
# charset is a string
retInt = zipCrc.CrcSb(sb, charset);
Introduced in version 9.5.0.75

Calculates a CRC32 for the string contained in sb. The charset is the byte representation to be used for the sb when calculating the CRC32. It can be utf-8, utf-16, windows-1252, iso-8859-1, or any of the character encodings (charsets) listed at the link below.

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CrcString
# str is a string
# charset is a string
retInt = zipCrc.CrcString(str, charset);
Introduced in version 9.5.0.75

Calculates a CRC32 for a string. The charset is the byte representation to be used for the str when calculating the CRC32. It can be utf-8, utf-16, windows-1252, iso-8859-1, or any of the character encodings (charsets) listed at the link below.

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EndStream
retInt = zipCrc.EndStream();

Finalizes and returns the Zip CRC value calculated by calling BeginStream followed by multiple calls to MoreData.

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FileCrc
# path is a string
retInt = zipCrc.FileCrc(path);

Calculates the CRC32 of a file. The data contained in the file is streamed for the calculation to keep the memory footprint small and constant. Returns the CRC32 of the file.

More Information and Examples
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FileCrcAsync (1)
# returns a CkTask
# path is a string
ret_task = zipCrc.FileCrcAsync(path);

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

Returns None on failure

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LoadTaskCaller
# task is a CkTask
status = zipCrc.LoadTaskCaller(task);
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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MoreData
# data is a CkByteData
zipCrc.MoreData(data);

Adds additional data to the CRC currently being calculated. (See BeginStream for more information.)

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ToHex
# crc is an integer
# outStr is a CkString (output)
status = zipCrc.ToHex(crc, outStr);
retStr = zipCrc.toHex(crc);

Converts a 32-bit integer to a hex string.

Returns True for success, False for failure.

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