CkoMht Objective-C Reference Documentation

CkoMht

Current Version: 9.5.0.75

Chilkat MHT can generate email objects from HTML files and URLs, and convert HTML to MHT or EML files.

Object Creation

CkoMht *obj = [[CkoMht alloc] init];

Properties

AbortCurrent
@property (nonatomic) BOOL AbortCurrent;
Introduced in version 9.5.0.58

When set to YES, 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 NO when the next method is called. When the abort occurs, this property is reset to NO. 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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BaseUrl
@property (nonatomic, copy) NSString *BaseUrl;

When processing an HTML file or string (not a website URL), this defines the base URL to be used when converting relative HREFs to absolute HREFs.

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ConnectTimeout
@property (nonatomic, copy) NSNumber *ConnectTimeout;

The amount of time in seconds to wait before timing out when connecting to an HTTP server. The default value is 10 seconds.

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DebugHtmlAfter
@property (nonatomic, copy) NSString *DebugHtmlAfter;

A filename to save the result HTML when converting a URL, file, or HTML string. If problems are experienced, the before/after HTML can be analyzed to help determine the cause.

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DebugHtmlBefore
@property (nonatomic, copy) NSString *DebugHtmlBefore;

A filename to save the input HTML when converting a URL, file, or HTML string. If problems are experienced, the before/after HTML can be analyzed to help determine the cause.

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DebugLogFilePath
@property (nonatomic, copy) NSString *DebugLogFilePath;

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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DebugTagCleaning
@property (nonatomic) BOOL DebugTagCleaning;

When YES causes the Mht class to be much more verbose in its logging. The default is NO.

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EmbedImages
@property (nonatomic) BOOL EmbedImages;

Controls whether images are embedded in the MHT/EML, or whether the IMG SRC attributes are left as external URL references. If false, the IMG SRC tags are converted to absolute URLs (if necessary) and the images are not embedded within the MHT/EML.

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EmbedLocalOnly
@property (nonatomic) BOOL EmbedLocalOnly;

If YES, only images found on the local filesystem (i.e. links to files) will be embedded within the MHT.

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FetchFromCache
@property (nonatomic) BOOL FetchFromCache;

If YES, page parts such as images, style sheets, etc. will be fetched from the disk cache if possible. The disk cache root may be defined by calling AddCacheRoot. The default value is NO.

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HeartbeatMs
@property (nonatomic, copy) NSNumber *HeartbeatMs;

The time interval, in milliseconds, between AbortCheck event callbacks. The heartbeat/AbortCheck provides a means for an application to abort any MHT method before completion.

The default value is 0, which means that no AbortCheck events will be fired.

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IgnoreMustRevalidate
@property (nonatomic) BOOL IgnoreMustRevalidate;

Some HTTP responses contain a "Cache-Control: must-revalidate" header. If this is present, the server is requesting that the client always issue a revalidate HTTP request instead of serving the page directly from cache. If IgnoreMustRevalidate is set to YES, then Chilkat MHT will serve the page directly from cache without revalidating until the page is no longer fresh. (assuming that FetchFromCache is set to YES)

The default value of this property is NO.

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IgnoreNoCache
@property (nonatomic) BOOL IgnoreNoCache;

Some HTTP responses contain headers of various types that indicate that the page should not be cached. Chilkat MHT will adhere to this unless this property is set to YES.

The default value of this property is NO.

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LastErrorHtml
@property (nonatomic, readonly, copy) NSString *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
@property (nonatomic, readonly, copy) NSString *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
@property (nonatomic, readonly, copy) NSString *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
@property (nonatomic) BOOL LastMethodSuccess;
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of YES indicates success, a value of NO 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 = YES and failure = NO.
  • 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 YES. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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NoScripts
@property (nonatomic) BOOL NoScripts;

Only applies when creating MHT files. Scripts are always removed when creating EML or emails from HTML. If set to YES, then all scripts are removed, if set to NO (the default) then scripts are not removed.

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NtlmAuth
@property (nonatomic) BOOL NtlmAuth;

Setting this property to YES causes the MHT component to use NTLM authentication (also known as IWA -- or Integrated Windows Authentication) when authentication with an HTTP server.

The default value of this property is NO.

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NumCacheLevels
@property (nonatomic, copy) NSNumber *NumCacheLevels;

The number of directory levels to be used under each cache root. The default is 0, meaning that each cached item is stored in a cache root directory. A value of 1 causes each cached page to be stored in one of 255 subdirectories named "0","1", "2", ..."255" under a cache root. A value of 2 causes two levels of subdirectories ("0..255/0..255") under each cache root. The MHT control automatically creates subdirectories as needed. The reason for mutliple levels is to alleviate problems that may arise when huge numbers of files are stored in a single directory. For example, Windows Explorer does not behave well when trying to display the contents of directories with thousands of files.

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NumCacheRoots
@property (nonatomic, readonly, copy) NSNumber *NumCacheRoots;

The number of cache roots to be used for the disk cache. This allows the disk cache spread out over multiple disk drives. Each cache root is a string indicating the drive letter and directory path. For example, "E:\Cache". To create a cache with four roots, call AddCacheRoot once for each directory root.

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PreferIpv6
@property (nonatomic) BOOL PreferIpv6;

If YES, then use IPv6 over IPv4 when both are supported for a particular domain. The default value of this property is NO, which will choose IPv4 over IPv6.

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PreferMHTScripts
@property (nonatomic) BOOL PreferMHTScripts;

This property provides a means for the noscript option to be selected when possible. If PreferMHTScripts = NO, then scripts with noscript alternatives are removed and the noscript content is kept. If YES (the default), then scripts are preserved and the noscript options are discarded.

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Proxy
@property (nonatomic, copy) NSString *Proxy;

(Optional) A proxy host:port if a proxy is necessary to access the Internet. The proxy string should be formatted as "hostname:port", such as "www.chilkatsoft.com:100".

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ProxyLogin
@property (nonatomic, copy) NSString *ProxyLogin;

If an HTTP proxy is used and it requires authentication, this property specifies the HTTP proxy login.

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ProxyPassword
@property (nonatomic, copy) NSString *ProxyPassword;

If an HTTP proxy is used and it requires authentication, this property specifies the HTTP proxy password.

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ReadTimeout
@property (nonatomic, copy) NSNumber *ReadTimeout;

The amount of time in seconds to wait before timing out when reading from an HTTP server. The ReadTimeout is the amount of time that needs to elapse while no additional data is forthcoming. During a long data transfer, if the data stream halts for more than this amount, it will timeout. Otherwise, there is no limit on the length of time for the entire data transfer.

The default value is 20 seconds.

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RequireSslCertVerify
@property (nonatomic) BOOL RequireSslCertVerify;

If YES, then the HTTP client will verify the server's SSL certificate. The certificate is expired, or if the cert's signature is invalid, the connection is not allowed. The default value of this property is NO.

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SocksHostname
@property (nonatomic, copy) NSString *SocksHostname;

The SOCKS4/SOCKS5 hostname or IPv4 address (in dotted decimal notation). This property is only used if the SocksVersion property is set to 4 or 5).

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SocksPassword
@property (nonatomic, copy) NSString *SocksPassword;

The SOCKS5 password (if required). The SOCKS4 protocol does not include the use of a password, so this does not apply to SOCKS4.

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SocksPort
@property (nonatomic, copy) NSNumber *SocksPort;

The SOCKS4/SOCKS5 proxy port. The default value is 1080. This property only applies if a SOCKS proxy is used (if the SocksVersion property is set to 4 or 5).

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SocksUsername
@property (nonatomic, copy) NSString *SocksUsername;

The SOCKS4/SOCKS5 proxy username. This property is only used if the SocksVersion property is set to 4 or 5).

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SocksVersion
@property (nonatomic, copy) NSNumber *SocksVersion;

SocksVersion May be set to one of the following integer values:

0 - No SOCKS proxy is used. This is the default.
4 - Connect via a SOCKS4 proxy.
5 - Connect via a SOCKS5 proxy.

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UnpackDirect
@property (nonatomic) BOOL UnpackDirect;
Introduced in version 9.5.0.47

If YES, then the UnpackMHT and UnpackMHTString methods will unpack the MHT directly with no transformations. Normally, the related parts are unpacked to a "parts" sub-directory, and the unpacked HTML is edited to update references to point to the unpacked image and script files. When unpacking direct, the HTML is not edited, and the related parts are unpacked to sub-directories rooted in the directory where HTML file is created (i.e. the unpack directory). When unpacking direct, the "partsSubDir" argument of the UnpackMHT* methods is unused.

Note: It is only possible to directly unpack MHT files where the Content-Location headers DO NOT contain URLs. The MHT must be such that the Content-Location headers of the related items contain relative paths.

Note: The default value of this property is NO.

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UnpackUseRelPaths
@property (nonatomic) BOOL UnpackUseRelPaths;

Controls whether absolute or relative paths are used when referencing images in the unpacked HTML. The default value is YES indicating that relative paths will be used. To use absolute paths, set this property value equal to NO.

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UpdateCache
@property (nonatomic) BOOL UpdateCache;

Controls whether the cache is automatically updated with the responses from HTTP GET requests. If YES, the disk cache is updated, if NO (the default), the cache is not updated.

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UseCids
@property (nonatomic) BOOL UseCids;

Controls whether CID URLs are used for embedded references when generating MHT or EML documents. If UseCids is NO, then URLs are left unchanged and the embedded items will contain "content-location" headers that match the URLs in the HTML. If YES, CIDs are generated and the URLs within the HTML are replaced with "CID:" links.

The default value of this property is YES.

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UseFilename
@property (nonatomic) BOOL UseFilename;

If YES, a "filename" attribute is added to each Content-Disposition MIME header field for each embedded item (image, style sheet, etc.). If NO, then no filename attribute is added.

The default value of this property is YES.

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UseIEProxy
@property (nonatomic) BOOL UseIEProxy;

If YES, the proxy host/port used by Internet Explorer will also be used by Chilkat MHT.

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UseInline
@property (nonatomic) BOOL UseInline;

If YES, an "inline" attribute is added to each Content-Disposition MIME header field for each embedded item (image, style sheet, etc.). If NO, then no inline attribute is added.

The default value of this property is YES.

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VerboseLogging
@property (nonatomic) BOOL VerboseLogging;

If set to YES, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is NO. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
@property (nonatomic, readonly, copy) NSString *Version;

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

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WebSiteLogin
@property (nonatomic, copy) NSString *WebSiteLogin;

(Optional) Specifies the login if a a Web page is accessed that requires a login

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WebSiteLoginDomain
@property (nonatomic, copy) NSString *WebSiteLoginDomain;

The optional domain name to be used with NTLM / Kerberos / Negotiate authentication.

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WebSitePassword
@property (nonatomic, copy) NSString *WebSitePassword;

Optional) Specifies the password if a a Web page is accessed that requires a login and password

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Methods

AddCacheRoot
- (void)AddCacheRoot:(NSString *)dir;

If disk caching is used, this must be called once for each cache root. For example, if the cache is spread across D:\cacheRoot, E:\cacheRoot, and F:\cacheRoot, an application would setup the cache object by calling AddRoot three times -- once with "D:\cacheRoot", once with "E:\cacheRoot", and once with "F:\cacheRoot".

More Information and Examples
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AddCustomHeader
- (void)AddCustomHeader:(NSString *)name
    value:(NSString *)value;

Adds a custom HTTP header to all HTTP requests sent by the MHT component. To add multiple header fields, call this method once for each custom header.

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AddExternalStyleSheet
- (void)AddExternalStyleSheet:(NSString *)url;

(This method rarely needs to be called.) Includes an additional style sheet that would not normally be included with the HTML. This method is provided for cases when style sheet names are constructed and dynamically included in Javascript such that MHT .NET cannot know beforehand what stylesheet to embed. MHT .NET by default downloads and embeds all stylesheets externally referenced by the HTML

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ClearCustomHeaders
- (void)ClearCustomHeaders;

Removes all custom headers that may have accumulated from previous calls to AddCustomHeader.

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ExcludeImagesMatching
- (void)ExcludeImagesMatching:(NSString *)pattern;

(This method rarely needs to be called.) Tells Chilkat MHT .NET to not embed any images whose URL matches a pattern. Sometimes images can be referenced within style sheets and not actually used when rendering the page. In cases like those, the image will appear as an attachment in the HTML email. This feature allows you to explicitly remove those images from the email so no attachments appear.

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GetAndSaveEML
- (BOOL)GetAndSaveEML:(NSString *)url
    emlPath:(NSString *)emlPath;

Creates an EML file from a web page or HTML file. All external images and style sheets are downloaded and embedded in the EML file.

Returns YES for success, NO for failure.

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GetAndSaveEMLAsync (1)
- (CkoTask *)GetAndSaveEMLAsync:(NSString *)url
    emlPath:(NSString *)emlPath;

Creates an asynchronous task to call the GetAndSaveEML 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.

Returns nil on failure

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GetAndSaveMHT
- (BOOL)GetAndSaveMHT:(NSString *)url
    mhtPath:(NSString *)mhtPath;

Creates an MHT file from a web page or local HTML file. All external images, scripts, and style sheets are downloaded and embedded in the MHT file.

Returns YES for success, NO for failure.

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GetAndSaveMHTAsync (1)
- (CkoTask *)GetAndSaveMHTAsync:(NSString *)url
    mhtPath:(NSString *)mhtPath;

Creates an asynchronous task to call the GetAndSaveMHT 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.

Returns nil on failure

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GetAndZipEML
- (BOOL)GetAndZipEML:(NSString *)url
    zipEntryFilename:(NSString *)zipEntryFilename
    zipPath:(NSString *)zipPath;

Creates an EML file from a web page or HTML file, compresses, and appends to a new or existing Zip file. All external images and style sheets are downloaded and embedded in the EML.

Returns YES for success, NO for failure.

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GetAndZipEMLAsync (1)
- (CkoTask *)GetAndZipEMLAsync:(NSString *)url
    zipEntryFilename:(NSString *)zipEntryFilename
    zipPath:(NSString *)zipPath;

Creates an asynchronous task to call the GetAndZipEML 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.

Returns nil on failure

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GetAndZipMHT
- (BOOL)GetAndZipMHT:(NSString *)url
    zipEntryFilename:(NSString *)zipEntryFilename
    zipPath:(NSString *)zipPath;

Creates an MHT file from a web page or HTML file, compresses, and appends to a new or existing Zip file. All external images and style sheets are downloaded and embedded in the MHT.

Returns YES for success, NO for failure.

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GetAndZipMHTAsync (1)
- (CkoTask *)GetAndZipMHTAsync:(NSString *)url
    zipEntryFilename:(NSString *)zipEntryFilename
    zipPath:(NSString *)zipPath;

Creates an asynchronous task to call the GetAndZipMHT 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.

Returns nil on failure

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GetCacheRoot
- (NSString *)GetCacheRoot:(NSNumber *)index;

Returns the Nth cache root (indexing begins at 0). Cache roots are set by calling AddCacheRoot one or more times.

Returns nil on failure

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GetEML
- (NSString *)GetEML:(NSString *)url;

Creates EML from a web page or HTML file, and returns the EML (MIME) message data as a string.

Returns nil on failure

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GetEMLAsync (1)
- (CkoTask *)GetEMLAsync:(NSString *)url;

Creates an asynchronous task to call the GetEML 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.

Returns nil on failure

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GetMHT
- (NSString *)GetMHT:(NSString *)url;

Creates MHT from a web page or local HTML file, and returns the MHT (MIME) message data as a string

Returns nil on failure

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GetMHTAsync (1)
- (CkoTask *)GetMHTAsync:(NSString *)url;

Creates an asynchronous task to call the GetMHT 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.

Returns nil on failure

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HtmlToEML
- (NSString *)HtmlToEML:(NSString *)htmlText;

Creates an in-memory EML string from an in-memory HTML string. All external images and style sheets are downloaded and embedded in the EML string that is returned.

Returns nil on failure

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HtmlToEMLAsync (1)
- (CkoTask *)HtmlToEMLAsync:(NSString *)htmlText;

Creates an asynchronous task to call the HtmlToEML 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.

Returns nil on failure

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HtmlToEMLFile
- (BOOL)HtmlToEMLFile:(NSString *)html
    emlPath:(NSString *)emlPath;

Creates an EML file from an in-memory HTML string. All external images and style sheets are downloaded and embedded in the EML file.

Returns YES for success, NO for failure.

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HtmlToEMLFileAsync (1)
- (CkoTask *)HtmlToEMLFileAsync:(NSString *)html
    emlPath:(NSString *)emlPath;

Creates an asynchronous task to call the HtmlToEMLFile 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.

Returns nil on failure

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HtmlToMHT
- (NSString *)HtmlToMHT:(NSString *)htmlText;

Creates an in-memory MHT web archive from an in-memory HTML string. All external images and style sheets are downloaded and embedded in the MHT string.

Returns nil on failure

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HtmlToMHTAsync (1)
- (CkoTask *)HtmlToMHTAsync:(NSString *)htmlText;

Creates an asynchronous task to call the HtmlToMHT 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.

Returns nil on failure

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HtmlToMHTFile
- (BOOL)HtmlToMHTFile:(NSString *)html
    mhtPath:(NSString *)mhtPath;

Creates an MHT file from an in-memory HTML string. All external images and style sheets are downloaded and embedded in the MHT file.

Returns YES for success, NO for failure.

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HtmlToMHTFileAsync (1)
- (CkoTask *)HtmlToMHTFileAsync:(NSString *)html
    mhtPath:(NSString *)mhtPath;

Creates an asynchronous task to call the HtmlToMHTFile 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.

Returns nil on failure

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IsUnlocked
- (BOOL)IsUnlocked;

Returns YES if the MHT component is unlocked.

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RemoveCustomHeader
- (void)RemoveCustomHeader:(NSString *)name;

Removes a custom header by header field name.

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RestoreDefaults
- (void)RestoreDefaults;

Restores the default property settings.

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SaveLastError
- (BOOL)SaveLastError:(NSString *)path;

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

Returns YES for success, NO for failure.

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UnlockComponent
- (BOOL)UnlockComponent:(NSString *)unlockCode;

Unlocks the component allowing for the full functionality to be used. Returns YES if the unlock code is valid.

Returns YES for success, NO for failure.

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UnpackMHT
- (BOOL)UnpackMHT:(NSString *)mhtPath
    unpackDir:(NSString *)unpackDir
    htmlFilename:(NSString *)htmlFilename
    partsSubDir:(NSString *)partsSubDir;

Unpacks the contents of a MHT file. The destination directory is specified by unpackDir. The name of the HTML file created is specified by htmlFilename, and supporting files (images, javascripts, etc.) are created in partsSubDir, which is automatically created if it does not already exist.

Returns YES for success, NO for failure.

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UnpackMHTString
- (BOOL)UnpackMHTString:(NSString *)mhtContents
    unpackDir:(NSString *)unpackDir
    htmlFilename:(NSString *)htmlFilename
    partsSubDir:(NSString *)partsSubDir;

Same as UnpackMHT, except the MHT is passed in as an in-memory string.

Returns YES for success, NO for failure.

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Events

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

For example:

  CkoMht *mht = [[CkoMht alloc] init];

  MyMhtProgress *callbackObj = [[MyMhtProgress alloc] init];

  [mht setEventCallbackObject:callbackObj];

MyMhtProgress interface example:

#import "CkoMhtProgress.h"

@interface MyMhtProgress : CkoBaseProgress {

}

    - (id)init;
    - (void)dealloc;
    - (void)dispose;

    - (void)AbortCheck:(BOOL *)abort;

    - (void)BinaryData:(NSData *)data 
        length:(NSNumber *)length;

    - (void)PercentDone:(NSNumber *)pctDone 
        abort:(BOOL *)abort;

    - (void)ProgressInfo:(NSString *)name 
        value:(NSString *)value;

    - (void)TaskCompleted:(CkoTask *)task;

    - (void)TextData:(NSString *)data;

@end
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:(NSNumber *)pctDone
    abort:(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 YES will cause the method to abort and return a failed status (or whatever return value indicates failure).

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ProgressInfo
- (void)ProgressInfo:(NSString *)name
    value:(NSString *)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:(CkoTask *)task;

Called in the background thread when an asynchronous task completes.

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