Zip VB.NET WinRT Reference Documentation

Zip

Current Version: 9.5.0.73

Zip compression component.

Object Creation

Dim obj As New Chilkat.Zip()

Properties

AbortCurrent
AbortCurrent As Boolean
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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AppendFromDir
AppendFromDir As String

When files are added to a Zip archive, they are appended from this directory. For example, to add all the files under c:/abc/123/myAppDir, this property could be set to "c:/abc/123", and "myAppDir/*" would be passed to AppendFiles. The path that is saved in the .zip would be "myAppDir/". (The value of the AppendFromDir property does not become part of the file path saved in the .zip.)

More Information and Examples
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CaseSensitive
CaseSensitive As Boolean

If True then all methods that get or search for zip entries by name will use case-sensitive filename matching. If False then filename matching will be case insensitive. Methods affected by this property include GetEntryByName, UnzipMatching, FirstMatchingEntry, etc.

The default value is False.

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ClearArchiveAttribute
ClearArchiveAttribute As Boolean

Set this to True to clear the FILE_ATTRIBUTE_ARCHIVE file attribute of each file during a zipping operation.

The default value is False.

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ClearReadOnlyAttr
ClearReadOnlyAttr As Boolean

If True, the read-only attribute is automatically cleared when unzipping. The default value of this property is False, which leaves the read-only attribute unchanged when unzipping.

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Comment
Comment As String

The global Zip file comment.

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DebugLogFilePath
DebugLogFilePath As String

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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DecryptPassword
DecryptPassword As String

When opening a password-protected or AES encrypted Zip, this is the password to be used for decryption. Encrypted Zips may be opened without setting a password, but the contents cannot be unzipped without setting this password.

Note:The SetPassword method has the effect of setting both this property as well as the EncryptPassword property. The SetPassword method should no longer be used. It has been replaced by the DecryptPassword and EncryptPassword properties to make it possible to open an encrypted zip and re-write it with a new password.

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DiscardPaths
DiscardPaths As Boolean

If True, discards all file path information when zipping. The default value is False.

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Encryption
Encryption As Integer

Indicate whether the Zip is to be strong encrypted or not. Valid values are 0 (not encrypted) or 4 (AES encrypted). When this property is set to the value 4, WinZip AES compatible encrypted zip archives are produced.

Note: Prior to Chilkat v9.4.1, other possible values for this property were: 1 (blowfish), 2 (twofish), and 3 (rijndael). These settings originally provided a way to produce strong encrypted zips prior to when the AES encrypted Zip standard existed. Using these legacy values (1, 2, or 3) produced encrypted zips that only applications using Chilkat could read. Chilkat no longer supports these custom modes of encryption. If using an older version of Chilkat with one of these deprecated encryption modes, make sure to decrypt using the old Chilkat version and re-encrypt using mode 4 (WinZip compatible AES encryption) prior to updating to the new Chilkat version.

Important:The Encryption and PasswordProtect properties are mutually exclusive. PasswordProtect corresponds to the older Zip 2.0 encryption, commonly referred to as a "password-protected" zip. If the PasswordProtect is set to True, the Encryption property should be set to 0. If the Encryption property is set to a non-zero value, then PasswordProtect should be set to False. A zip cannot be both password-protected and strong-encrypted.

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EncryptKeyLength
EncryptKeyLength As Integer

The encryption key length if AES, Blowfish, Twofish, or WinZip-compatible AES encryption is used. This value must be 128, 192, or 256. The default value is 128.

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EncryptPassword
EncryptPassword As String

The password used when writing a password-protected or strong-encrytped Zip.

Note:The SetPassword method has the effect of setting both this property as well as the DecryptPassword property. The SetPassword method should no longer be used. It has been replaced by the DecryptPassword and EncryptPassword properties to make it possible to open an encrypted zip and re-write it with a new password.

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FileCount
FileCount As Integer (ReadOnly)

The number of files (excluding directories) contained within the Zip.

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FileName
FileName As String

The path (absolute or relative) of the Zip archive. This is the path of the file that is created or overwritten when the zip is saved.

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HasZipFormatErrors
HasZipFormatErrors As Boolean (ReadOnly)

True if the opened zip contained file format errors (that were not severe enough to prevent the zip from being opened and parsed).

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HeartbeatMs
HeartbeatMs As Integer

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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IgnoreAccessDenied
IgnoreAccessDenied As Boolean

If True, then files that cannot be read due to "access denied" (i.e. a file permission error) will be ignored and the call to WriteZip, WriteZipAndClose, WriteExe, etc. will return a success status. If False, then the "access denied" filesystem errors are not ignored and any occurrence will cause the zip writing to fail. The default value is True.

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LastErrorHtml
LastErrorHtml As String (ReadOnly)

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
LastErrorText As String (ReadOnly)

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
LastErrorXml As String (ReadOnly)

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
LastMethodSuccess As Boolean
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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NumEntries
NumEntries As Integer (ReadOnly)

The number of entries in the Zip, including both files and directories.

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OemCodePage
OemCodePage As Integer

Sets the OEM code page to be used for Unicode filenames. This property defaults to the OEM code page of the computer.

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OverwriteExisting
OverwriteExisting As Boolean

Determines whether existing files are overwritten during unzipping. The default is True, which means that already-existing files will be overwritten. Set this property = False to prevent existing files from being overwritten when unzipping.

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PasswordProtect
PasswordProtect As Boolean

True if the Zip should be password-protected using older Zip 2.0 encryption, commonly referred to as "password-protection".

This property is set when a zip archive is opened by any of the Open* methods, such as OpenZip, OpenFromMemory, etc.

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PathPrefix
PathPrefix As String

A prefix that is added to each filename when zipping. One might set the PathPrefix to "subdir/" so that files are unzipped to a specified subdirectory when unzipping.

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PercentDoneScale
PercentDoneScale As Integer
Introduced in version 9.5.0.49

This property is only valid in programming environment and languages that allow for event callbacks.

Sets the value to be defined as 100% complete for the purpose of PercentDone event callbacks. The defaut value of 100 means that at most 100 event PercentDone callbacks will occur in a method that (1) is event enabled and (2) is such that it is possible to measure progress as a percentage completed. This property may be set to larger numbers to get more fine-grained PercentDone callbacks. For example, setting this property equal to 1000 will provide callbacks with .1 percent granularity. For example, a value of 453 would indicate 45.3% competed. This property is clamped to a minimum value of 10, and a maximum value of 100000.

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PwdProtCharset
PwdProtCharset As String
Introduced in version 9.5.0.73

For older password-protected Zip archives (Zip 2.0 encryption), specifies the charset used for the binary representation of the decrypt password. The default value is "ansi". Other possible choices are cp850, cp437, or any of the code pages listed at the link below.

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TempDir
TempDir As String

The temporary directory to use when unzipping files. When running in ASP or ASP.NET, the default value of TempDir is set to the directory where the .zip is being written. Set this property to override the default.

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TextFlag
TextFlag As Boolean

If set to True, the component will set the "text flag" for each file having these filename extensions: .txt, .xml, .htm, and .html. It will also preserve the "text flag" for existing zips that are opened and rewritten. By default, this property is set to False.

It is generally not necessary to set the text flag for a zip entry.

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VerboseLogging
VerboseLogging As Boolean

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
Version As String (ReadOnly)

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

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Zipx
Zipx As Boolean

Starting in v9.4.1, Chilkat Zip will automatically unzip ZIPX files using any of the following compression methods: BZIP2, PPMd, LZMA, and Deflate64 ("Deflate64" is a trademark of PKWare, Inc.)

This property, however, controls whether or not a ZipX is automatically produced where the best compression algorithm for each file is automatically chosen based on file type. This property is for writing zip archives. It does not apply to when unzipping ZIPX archives, Chilkat Zip automatically handles the various compression algorithms when unzipping.

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ZipxDefaultAlg
ZipxDefaultAlg As String

The default compression algorithm to be used when creating ZIPX archives. The default value is "deflate". Other possible values are "ppmd", "lzma", "bzip2" and "deflate64". When writing a ZIPX archive, if the file extension does not indicate an obvious choice for the appropriate compression algorithm, then the ZipxDefaultAlg is used.

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Methods

AddNoCompressExtension
Sub AddNoCompressExtension(ByVal fileExtension As String)

Attempting to compress already-compressed data is usually a waste of CPU cycles with little or no benefit. In fact, it is possible that attempting to compress already-compressed data results in a slightly increased size. The Zip file format allows for files to be "stored" rather than compressed. This allows the file data to be streamed directly into a .zip without compression.

An instance of the Zip object has an internal list of "no compress" extensions. A filename with a "no compress" extension is "stored" rather than compressed. Additional "no compress" extensions may be added by calling this method (once per file extension). You should pass the file extension, such as ".xyz" in fileExtension.

"no compress" extensions may be removed by calling RemoveNoCompressExtension.

The default "no compress" extensions are: .zip, .gif, .jpg, .gz, .rar, .jar, .tgz, .bz2, .z, .rpm, .msi, .png

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AppendBase64
Function AppendBase64(ByVal fileName As String, ByVal encodedCompressedData As String) As ZipEntry

Creates a new Zip entry and initializes it with already-compressed data that is Base64 encoded. (The ZipEntry.CopyBase64 method can be used to retrieve the compressed data in Base64 format.)

Note 1: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Note 2: It is assumed that the compressed data is unencrypted deflated data. (Meaning data compressed using the "deflate" compression algorithm.)

Returns Nothing on failure

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AppendBd
Function AppendBd(ByVal pathInZip As String, ByVal byteData As BinData) As ZipEntry
Introduced in version 9.5.0.70

Appends the contents of byteData as a new entry to this zip object. The zip entry object containing the data is returned.

Returns Nothing on failure

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AppendCompressed
Function AppendCompressed(ByVal filename As String, ByVal inData As Byte()) As ZipEntry

Append memory data that is already Zip-compressed to the Zip object. The ZipEntry object containing the compressed data is returned. Note: This method appends the compressed data for a single zip entry. To load an entire in-memory .zip, call OpenFromMemory instead.

Note 1: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Note 2: It is assumed that the compressed data is unencrypted deflated data. (Meaning data compressed using the "deflate" compression algorithm.)

Returns Nothing on failure

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AppendData
Function AppendData(ByVal fileName As String, ByVal inData As Byte()) As ZipEntry

Appends in-memory data as a new entry to a Zip object. The ZipEntry object containing the data is returned.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

More Information and Examples
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AppendDataEncoded
Function AppendDataEncoded(ByVal filename As String, ByVal encoding As String, ByVal data As String) As ZipEntry
Introduced in version 9.5.0.59

Appends in-memory data as a new entry to a Zip object. The filename is the filename of the entry as it will appear within the zip. The encoding is the encoding of the data, such as "base64", "hex", etc. The full list of encodings is listed at the web page linked below.

Returns the zip entry object.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

More Information and Examples
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AppendFiles
<Awaitable> Function AppendFilesAsyncAsync(ByVal filePattern As String, ByVal recurse As Boolean) As IAsyncOperation(Of Boolean)

Appends one or more files to the Zip object. The filePattern can use the "*" wildcard character for 0 or more of any characterSet recurse equal to True to recursively add all subdirectories, or False to only add files in the current directory.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns True for success, False for failure.

More Information and Examples
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AppendFilesEx
<Awaitable> Function AppendFilesExAsyncAsync(ByVal filePattern As String, ByVal recurse As Boolean, ByVal saveExtraPath As Boolean, ByVal archiveOnly As Boolean, ByVal includeHidden As Boolean, ByVal includeSystem As Boolean) As IAsyncOperation(Of Boolean)

Appends one or more files to the Zip object. The filePattern can use the "*" and "?" wildcard characters where "*" means 0 or more of any character and "?" means any single character. The recurse controls whether directories are recursively traversed. Set recurse equal to True to append files and subdirectories in the directory tree. Set recurse equal to False to add files only from the indicated directory.

The saveExtraPath only applies when the filePattern is an absolute path pattern, such as "C:/temp/abc/*.txt". If saveExtraPath is True, then the absolute path will be included in the zip entry filenames as relative paths. For example, "temp/abc/xyz.txt".

The archiveOnly, includeHidden, and includeSystem flags only apply when on the Windows operating system. If archiveOnly is True, then only files that have the archive bit set will be included in the zip. If includeHidden is False, then hidden files are not included. If includeSystem is False, then files having the System attribute are not included.

Note: This method does not write the zip archive. It simply adds references to the files that will be included in the .zip when the WriteZip or WriteZipAndClose methods are eventually called. Files and/or data may be added to the zip object by calling any combination of the Append* methods before finally writing the zip via one of the Write* methods.

Returns True for success, False for failure.

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AppendHex
Function AppendHex(ByVal fileName As String, ByVal encodedCompressedData As String) As ZipEntry

Creates a new Zip entry and initializes it with already-compressed data that is hexidecimal encoded. (The ZipEntry.CopyHex method can be used to retrieve the compressed data in Hex format.)

Note 1: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Note 2: It is assumed that the compressed data is unencrypted deflated data. (Meaning data compressed using the "deflate" compression algorithm.)

Returns Nothing on failure

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AppendMultiple
<Awaitable> Function AppendMultipleAsyncAsync(ByVal fileSpecs As StringArray, ByVal recurse As Boolean) As IAsyncOperation(Of Boolean)

This method is the same as calling AppendFiles multiple times - once for each file pattern in fileSpecs

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns True for success, False for failure.

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AppendNew
Function AppendNew(ByVal fileName As String) As ZipEntry

Appends a new and empty entry to the Zip object and returns the ZipEntry object. Data can be appended to the entry by calling ZipEntry.AppendData.

Important: To append an already-existing file, call the AppendOneFileOrDir method. The AppendNew method inserts a new and empty file entry within the Zip object. The purpose of AppendNew is to either create an empty file within the Zip, or to create a new file entry which can then be filled with data by calling the entry's AppendData method.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

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AppendNewDir
Function AppendNewDir(ByVal dirName As String) As ZipEntry

Adds an entry to the zip so that when it unzips, a new directory (with no files) is created. The directory does not need to exist on the local filesystem when calling this method. The dirName is simply a string that is used as the directory path for the entry added to the zip. The zip entry object is returned.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

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AppendOneFileOrDir
<Awaitable> Function AppendOneFileOrDirAsyncAsync(ByVal fileOrDirPath As String, ByVal saveExtraPath As Boolean) As IAsyncOperation(Of Boolean)

Appends a single file or directory to the Zip object. The saveExtraPath applies when fileOrDirPath is an absolute (non-relative) path. If saveExtraPath is True, then the absolute path is made relative and saved in the zip. For example, if the fileOrDirPath is "C:/temp/xyz/test.txt" and saveExtraPath is True, then the path in the zip will be "./temp/xyz/test.txt". If however, fileOrDirPath contains a relative path, then saveExtraPath has no effect.

Returns True for success, False for failure.

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AppendString
Function AppendString(ByVal internalZipFilepath As String, ByVal textData As String) As ZipEntry

Adds an in-memory string to the Zip object. The textData argument is converted to the ANSI charset before being added to the Zip. If the Zip were written to disk by calling WriteZip, and later unzipped, the entry would unzip to an ANSI text file.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

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AppendString2
Function AppendString2(ByVal internalZipFilepath As String, ByVal textData As String, ByVal charset As String) As ZipEntry

Same as AppendString, but allows the charset to be specified. The textData is converted to charset before being added to the zip. The internalZipFilepath is the path of the file that will be stored within the zip.

Note: This method only updates the zip object. To update (rewrite) a zip file, either the WriteZip or WriteZipAndClose method would need to be called.

Returns Nothing on failure

More Information and Examples
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AppendZip
Function AppendZip(ByVal zipFileName As String) As Boolean

Adds the contents of another existing Zip file to this Zip object.

Returns True for success, False for failure.

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CloseZip
Sub CloseZip()

Closes an open Zip file. This is identical to calling NewZip. (NewZip closes the current Zip file, if open, and initializes the Zip object to be empty. Zip files are only created when WriteZip is called.)

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DeleteEntry
Function DeleteEntry(ByVal entry As ZipEntry) As Boolean

Removes a Zip entry from the calling Zip object.

Returns True for success, False for failure.

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ExcludeDir
Sub ExcludeDir(ByVal dirName As String)

Adds a directory name to be excluded when AppendFiles is called to add an entire directory tree. All directories having a name equal to an excluded directory will not be included when AppendFiles (or AppendFileEx) is called. Multiple directories can be excluded by calling ExcludeDir multiple times. The name comparison is case-insensitive.

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Extract
<Awaitable> Function ExtractAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Boolean)

Unzip all the files into the specified directory. Subdirectories are automatically created as needed.

Returns True for success, False for failure.

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ExtractInto
<Awaitable> Function ExtractIntoAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Boolean)

Unzips all the files in a Zip into a single directory regardless of the path stored in the Zip

Returns True for success, False for failure.

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ExtractMatching
<Awaitable> Function ExtractMatchingAsyncAsync(ByVal dirPath As String, ByVal pattern As String) As IAsyncOperation(Of Boolean)

Unzip all files matching a wildcard pattern.

Returns True for success, False for failure.

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ExtractNewer
<Awaitable> Function ExtractNewerAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Boolean)

Extracts only the files that have more recent last-modified-times than the files on disk. This allows you to easily refresh only the files that have been updated.

Returns True for success, False for failure.

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ExtractOne
<Awaitable> Function ExtractOneAsyncAsync(ByVal entry As ZipEntry, ByVal dirPath As String) As IAsyncOperation(Of Boolean)
This method is deprecated. It will be removed in a future version.

Identical to calling ZipEntry.Extract. This method is deprecated and the Extract method of the zip entry should be called instead.

Returns True for success, False for failure.

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FirstEntry
Function FirstEntry() As ZipEntry

Return the first entry in the Zip. Call ZipEntry.NextEntry to iterate over the entries in a Zip until a NULL is returned.

Returns Nothing on failure

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FirstMatchingEntry
Function FirstMatchingEntry(ByVal pattern As String) As ZipEntry

Returns the first entry having a filename matching a pattern. The "*" characters matches 0 or more of any character. The full filename, including path, is used when matching against the pattern. A NULL is returned if nothing matches.

Returns Nothing on failure

More Information and Examples
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GetDirectoryAsXML
Function GetDirectoryAsXML() As String

Return the contents of the Zip file directory in an XML formatted string

Returns Nothing on failure

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GetEntryByID
Function GetEntryByID(ByVal entryID As Integer) As ZipEntry

Retrieves a ZipEntry by ID. Chilkat Zip.NET automatically assigns a unique ID to each ZipEntry in the Zip. This feature makes it easy to associate an item in a UI control with a ZipEntry.

Returns Nothing on failure

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GetEntryByIndex
Function GetEntryByIndex(ByVal index As Integer) As ZipEntry

Retrieves a ZipEntry by index. The first entry is at index 0. This will return directory entries as well as files.

Returns Nothing on failure

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GetEntryByName
Function GetEntryByName(ByVal entryName As String) As ZipEntry

Returns a ZipEntry by filename. If a full or partial path is part of the filename, this must be included in the filename parameter.

Returns Nothing on failure

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GetExclusions
Function GetExclusions() As StringArray

Returns the current collection of exclusion patterns that have been set by SetExclusions.

Returns Nothing on failure

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InsertNew
Function InsertNew(ByVal fileName As String, ByVal beforeIndex As Integer) As ZipEntry

Inserts a new and empty entry into the Zip object. To insert at the beginning of the Zip, beforeIndex should be 0. The ZipEntry's FileName property is initialized to fileName parameter.

Returns Nothing on failure

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IsNoCompressExtension
Function IsNoCompressExtension(ByVal fileExtension As String) As Boolean

Returns True if the fileExtension is contained in the set of "no compress" extensions, otherwise returns False. (See the documentation for the AddNoCompressExtension method.) The fileExtension may be passed with or without the ".". For example, both ".jpg" and "jpg" are acceptable.

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IsPasswordProtected
Function IsPasswordProtected(ByVal zipFilename As String) As Boolean

Return True if a Zip file is password protected

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IsUnlocked
Function IsUnlocked() As Boolean

Returns True if the class is already unlocked, otherwise returns False.

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NewZip
Function NewZip(ByVal zipFilePath As String) As Boolean

Clears and initializes the contents of the Zip object. If a Zip file was open, it is closed and all entries are removed from the object. The FileName property is set to the zipFilePath argument.

More Information and Examples
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OpenBd
Function OpenBd(ByVal binData As BinData) As Boolean
Introduced in version 9.5.0.66

Open a Zip contained in binData.

When a zip is opened, the PasswordProtect and Encryption properties will be appropriately set. If the zip is password protected (i.e. uses older Zip 2.0 encrypion), then the PasswordProtect property will be set to True. If the zip is strong encrypted, the Encryption property will be set to a value 1 through 4, where 4 indicates WinZip compatible AES encryption.

Returns True for success, False for failure.

More Information and Examples
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OpenFromByteData
Function OpenFromByteData(ByVal byteData As Byte()) As Boolean

Same as OpenFromMemory.

When a zip is opened, the PasswordProtect and Encryption properties will be appropriately set. If the zip is password protected (i.e. uses older Zip 2.0 encrypion), then the PasswordProtect property will be set to True. If the zip is strong encrypted, the Encryption property will be set to a value 1 through 4, where 4 indicates WinZip compatible AES encryption.

Returns True for success, False for failure.

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OpenFromMemory
Function OpenFromMemory(ByVal inData As Byte()) As Boolean

Open a Zip that is completely in-memory. This allows for Zip files to be opened from non-filesystem sources, such as a database.

When a zip is opened, the PasswordProtect and Encryption properties will be appropriately set. If the zip is password protected (i.e. uses older Zip 2.0 encrypion), then the PasswordProtect property will be set to True. If the zip is strong encrypted, the Encryption property will be set to a value 1 through 4, where 4 indicates WinZip compatible AES encryption.

Returns True for success, False for failure.

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OpenZip
<Awaitable> Function OpenZipAsyncAsync(ByVal zipPath As String) As IAsyncOperation(Of Boolean)

Opens a Zip archive. Encrypted and password-protected zips may be opened without providing the password, but their contents may not be unzipped unless the correct password is provided via the DecryptPassword proprety, or the SetPassword method.

When a zip is opened, the PasswordProtect and Encryption properties will be appropriately set. If the zip is password protected (i.e. uses older Zip 2.0 encrypion), then the PasswordProtect property will be set to True. If the zip is strong encrypted, the Encryption property will be set to a value 1 through 4, where 4 indicates WinZip compatible AES encryption.

Returns True for success, False for failure.

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QuickAppend
<Awaitable> Function QuickAppendAsyncAsync(ByVal ZipFileName As String) As IAsyncOperation(Of Boolean)

Efficiently appends additional files to an existing zip archive. QuickAppend leaves all entries in the existing .zip untouched. It operates by appending new files and updating the internal "central directory" of the zip archive.

Returns True for success, False for failure.

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RemoveNoCompressExtension
Sub RemoveNoCompressExtension(ByVal fileExtension As String)

Removes a file extension from the zip object's internal list of "no compress" extensions. (For more information, see AddNoCompressExtension.)

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SetCompressionLevel
Sub SetCompressionLevel(ByVal level As Integer)

Sets the compression level for all file and data entries. The compression level for a mapped entry (i.e. an entry that is contained within an opened .zip, cannot be changed.) The default compression level is 6. A compression level of 0 is equivalent to no compression. The maximum compression level is 9.

The zip.SetCompressionLevel method must be called after appending the files (i.e. after the calls to AppendFile*, AppendData, or AppendOneFileOrDir).

A single call to SetCompressionLevel will set the compression level for all existing file and data entries.

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SetExclusions
Sub SetExclusions(ByVal excludePatterns As StringArray)

Specify a collection of exclusion patterns to be used when adding files to a Zip. Each pattern in the collection can use the "*" wildcard character, where "*" indicates 0 or more occurrences of any character.

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SetPassword
Sub SetPassword(ByVal password As String)

Set the password for an encrypted or password-protected Zip.

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UnlockComponent
Function UnlockComponent(ByVal regCode As String) As 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.

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Unzip
<Awaitable> Function UnzipAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Integer)

Unzips and returns the number of files unzipped, or -1 if a failure occurs. Subdirectories are automatically created during the unzipping process.

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UnzipInto
<Awaitable> Function UnzipIntoAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Integer)

Unzips and returns the number of files unzipped, or -1 if a failure occurs. All files in the Zip are unzipped into the specfied dirPath regardless of the directory path information contained in the Zip. This has the effect of collapsing all files into a single directory. If several files in the Zip have the same name, the files unzipped last will overwrite the files already unzipped.

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UnzipMatching
<Awaitable> Function UnzipMatchingAsyncAsync(ByVal dirPath As String, ByVal pattern As String, ByVal verbose As Boolean) As IAsyncOperation(Of Integer)

Same as Unzip, but only unzips files matching a pattern. If no wildcard characters ('*') are used, then only files that exactly match the pattern will be unzipped. The "*" characters matches 0 or more of any character.

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UnzipMatchingInto
<Awaitable> Function UnzipMatchingIntoAsyncAsync(ByVal dirPath As String, ByVal pattern As String, ByVal verbose As Boolean) As IAsyncOperation(Of Integer)

Unzips matching files into a single directory, ignoring all path information stored in the Zip.

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UnzipNewer
<Awaitable> Function UnzipNewerAsyncAsync(ByVal dirPath As String) As IAsyncOperation(Of Integer)

Same as Unzip, but only files that don't already exist on disk, or have later file modification dates are unzipped.

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VerifyPassword
Function VerifyPassword() As Boolean

Tests the current DecryptPassword setting against the currently opened zip. Returns True if the password is valid, otherwise returns False.

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WriteBd
<Awaitable> Function WriteBdAsyncAsync(ByVal binData As BinData) As IAsyncOperation(Of Boolean)
Introduced in version 9.5.0.66

Same as WriteZip, but instead of writing the Zip to a file, it writes to binData. Zips that are written to binData can be opened by calling OpenBd. Note: Both WriteBd and OpenBd are added in Chilkat v9.5.0.66

Returns True for success, False for failure.

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WriteToMemory
<Awaitable> Function WriteToMemoryAsyncAsync() As IAsyncOperation(Of Byte())

Same as WriteZip, but instead of writing the Zip to a file, it writes to memory. Zips that are written to memory can also be opened from memory by calling OpenFromMemory.

Returns an empty byte array on failure

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WriteZip
<Awaitable> Function WriteZipAsyncAsync() As IAsyncOperation(Of Boolean)

Saves the Zip to a file and implictly re-opens it so further operations can continue. Use WriteZipAndClose to write and close the Zip. There is no limitation on the size of files that may be contained within a .zip, the total number of files in a .zip, or the total size of a .zip. If necessary, WriteZip will use the ZIP64 file format extensions when 4GB or file count limitations of the old zip file format are exceeded.

Returns True for success, False for failure.

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WriteZipAndClose
<Awaitable> Function WriteZipAndCloseAsyncAsync() As IAsyncOperation(Of Boolean)

Saves the Zip to a file and closes it. On return, the Zip object will be in the state as if NewZip had been called. There is no limitation on the size of files that may be contained within a .zip, the total number of files in a .zip, or the total size of a .zip. If necessary, WriteZip will use the ZIP64 file format extensions when 4GB or file count limitations of the old zip file format are exceeded.

Returns True for success, False for failure.

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Events