Log DataFlex Reference Documentation

Log

Handy logging class exposing much of the functionality used internally by Chilkat for LastErrorText, LastErrorXml, and LastErrorHtml.

Object Creation

Handle hoLog
Get Create(RefClass(cComChilkatLog)) to hoLog

Properties

Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

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.

Function ComLastBinaryResult Returns Variant

Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

Function ComLastErrorHtml Returns String

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.

Function ComLastErrorText Returns String

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.

Function ComLastErrorXml Returns String

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.

Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value

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.

Function ComLastStringResult Returns String

Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

Long Strings Returned by ActiveX Methods in SQL Server

Function ComLastStringResultLen Returns Integer

Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

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.

Function ComVersion Returns String

Version of the component/library, such as "9.4.1.42"

Methods

Procedure ComClear String initialTag

Introduced in version 9.5.0.44

Clears the log. The initialTag is the initial top-level context tag for the new log.

Procedure ComEnterContext String tag

Introduced in version 9.5.0.44

Enters a new context labelled with the given tag. Must be paired with a matching call to LeaveContext.

Procedure ComLeaveContext

Introduced in version 9.5.0.44

Leaves the current context. A context that is entered and exited without any logging within the context is automatically removed from the log. (To say it another way: Empty contexts are automaticallly removed from the log upon leaving the context.)

Procedure ComLogData String tag String message

Introduced in version 9.5.0.44

Adds a tagged message to the log (i.e. a name/value pair).

Procedure ComLogDataBase64 String tag Variant data

Introduced in version 9.5.0.44

Logs binary data in base64 format.

Procedure ComLogDataHex String tag Variant data

Introduced in version 9.5.0.44

Logs binary data in hex format.

Procedure ComLogDataMax String tag String message Integer maxNumChars

Introduced in version 9.5.0.44

Logs a string, but only up to the 1st maxNumChars characters of the string.

Procedure ComLogDateTime String tag Boolean gmt

Introduced in version 9.5.0.44

Logs the current date/time in RFC822 format. If gmt is True, then the GMT/UTC time is logged. Otherwise it is the local time.

Procedure ComLogError String message

Introduced in version 9.5.0.44

Logs an error within the current context.

Procedure ComLogInfo String message

Introduced in version 9.5.0.44

Logs an informational message within the current context.

Procedure ComLogInt String tag Integer value

Introduced in version 9.5.0.44

Logs an integer.

Procedure ComLogTimestamp String tag

Introduced in version 9.5.0.44

Logs the current time in HH:MM:SS:mmm format.