CkZipEntry C++ Reference Documentation

CkZipEntry

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).

Properties

void get_Comment(CkString &str);
const char *comment(void);
void put_Comment(const char *ansiOrUtf8Str);

The comment stored within the Zip for this entry.

unsigned long get_CompressedLength(void);

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

__int64 get_CompressedLength64(void);

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

void get_CompressedLengthStr(CkString &str);
const char *compressedLengthStr(void);

The size in decimal string format of this file when Zip compression is applied.

int get_CompressionLevel(void);
void put_CompressionLevel(int newVal);

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

int get_CompressionMethod(void);
void put_CompressionMethod(int newVal);

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

int get_Crc(void);

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 )

void get_DebugLogFilePath(CkString &str);
const char *debugLogFilePath(void);
void put_DebugLogFilePath(const char *ansiOrUtf8Str);

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.

int get_EncryptionKeyLen(void);

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.

int get_EntryID(void);

The unique ID assigned by Zip.NET while the object is instantiated in memory.

int get_EntryType(void);

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.)

SYSTEMTIME & get_FileDateTime(void);
void put_FileDateTime(SYSTEMTIME &newVal);

This property is deprecated. It will be removed in a future version.

The local last-modified date/time.

void get_FileDateTimeStr(CkString &str);
const char *fileDateTimeStr(void);
void put_FileDateTimeStr(const char *ansiOrUtf8Str);

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

void get_FileName(CkString &str);
const char *fileName(void);
void put_FileName(const char *ansiOrUtf8Str);

The file name of the Zip entry.

(C++) Set Entry Filepath (in output Zip) when Zipping

(MFC) Set Entry Filepath (in output Zip) when Zipping

void get_FileNameHex(CkString &str);
const char *fileNameHex(void);

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

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 inflate/extract/unzip calls prior to completion. If HeartbeatMs is 0 (the default), no AbortCheck event callbacks will fire.

bool get_IsAesEncrypted(void);

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.

bool get_IsDirectory(void);

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

void get_LastErrorHtml(CkString &str);
const char *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.

void get_LastErrorText(CkString &str);
const char *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.

Concept of LastErrorText

LastErrorText Standard Information

void get_LastErrorXml(CkString &str);
const char *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.

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.

bool get_TextFlag(void);
void put_TextFlag(bool newVal);

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.

unsigned long get_UncompressedLength(void);

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

__int64 get_UncompressedLength64(void);

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

void get_UncompressedLengthStr(CkString &str);
const char *uncompressedLengthStr(void);

The size in bytes (in decimal string format) of this zip entry's data when uncompressed.

bool get_Utf8(void);
void put_Utf8(bool newVal);

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.

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.

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

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

Methods

bool AppendData(CkByteData &inData);

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

Returns true for success, false for failure.

CkTask *AppendDataAsync(CkByteData &inData);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

bool AppendString(const char *strContent, const char *charset);

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.

CkTask *AppendStringAsync(const char *strContent, const char *charset);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

bool Copy(CkByteData &outData);

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 true for success, false for failure.

bool CopyToBase64(CkString &outStr);
const char *copyToBase64(void);

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 true for success, false for failure.

bool CopyToHex(CkString &outStr);
const char *copyToHex(void);

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 true for success, false for failure.

bool Extract(const char *dirPath);

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.

CkTask *ExtractAsync(const char *dirPath);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

bool ExtractInto(const char *dirPath);

Unzip a file into a specific directory

Returns true for success, false for failure.

CkTask *ExtractIntoAsync(const char *dirPath);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

CkDateTime *GetDt(void);

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

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

Returns NULL on failure

bool Inflate(CkByteData &outData);

Inflate a file within a Zip directly into memory.

Returns true for success, false for failure.

CkTask *InflateAsync(void);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

CkZipEntry *NextEntry(void);

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

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

Returns NULL on failure

CkZipEntry *NextMatchingEntry(const char *matchStr);

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.

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

Returns NULL on failure

(C++) Iterate over Matching Filenames

(MFC) Iterate over Matching Filenames

bool ReplaceData(CkByteData &inData);

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

Returns true for success, false for failure.

bool ReplaceString(const char *strContent, const char *charset);

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.

(C++) Replace/Update a FIle in a .zip

(MFC) Replace/Update a FIle in a .zip

bool SaveLastError(const char *path);

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

Returns true for success, false for failure.

void SetDt(CkDateTime &dt);

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

bool UnzipToBd(CkBinData &binData);

Introduced in version 9.5.0.67

Unzips the entry contents into the binData.

Returns true for success, false for failure.

CkTask *UnzipToBdAsync(CkBinData &binData);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

bool UnzipToSb(int lineEndingBehavior, const char *srcCharset, CkStringBuilder &sb);

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.

CkTask *UnzipToSbAsync(int lineEndingBehavior, const char *srcCharset, CkStringBuilder &sb);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

bool UnzipToStream(CkStream &toStream);

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.

(C++) Unzip Binary File to Stream

(MFC) Unzip Binary File to Stream

CkTask *UnzipToStreamAsync(CkStream &toStream);

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.

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

Returns NULL on failure

(C++) Unzip One File to a Stream

(MFC) Unzip One File to a Stream

bool UnzipToString(int lineEndingBehavior, const char *srcCharset, CkString &outStr);
const char *unzipToString(int lineEndingBehavior, const char *srcCharset);

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 true for success, false for failure.

(C++) Iterate over Matching Filenames

(MFC) Iterate over Matching Filenames

(C++) Download a Zip from a URL and OpenFromMemory. (No .zip fie is created)

(MFC) Download a Zip from a URL and OpenFromMemory. (No .zip fie is created)

CkTask *UnzipToStringAsync(int lineEndingBehavior, const char *srcCharset);

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.

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

Returns NULL on failure

(C++) How to Run an Asynchronous Task

(MFC) How to Run an Asynchronous Task

Events

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

For example:

  CkZipEntry zipentry;

  MyZipEntryProgress callbackObj;

  zipentry.put_EventCallbackObject(&callbackObj);

MyZipEntryProgress example:

#include "CkBaseProgress.h"

class MyZipEntryProgress : public CkBaseProgress {

  public:
    MyZipEntryProgress();
    virtual ~MyZipEntryProgress();

    void AbortCheck(bool  *abort);

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

    void PercentDone(int pctDone, bool  *abort);

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

    void TaskCompleted(CkTask &task);

    void TextData(const char *data);

};

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.

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

Binary data provided by certain methods.

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).

void ProgressInfo(const char *name, const char *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.

void TaskCompleted(CkTask &task);

Called in the background thread when an asynchronous task completes.

void TextData(const char *data);

Text data provided by certain methods.