Log Delphi DLL Reference Documentation

Log

Current Version: 9.5.0.73

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

Create/Dispose

var
myObject: HCkLog;

begin
myObject := CkLog_Create();

// ...

CkLog_Dispose(myObject);
end;
function CkLog_Create: HCkLog; stdcall;

Creates an instance of the HCkLog object and returns a handle (i.e. a Pointer). The handle is passed in the 1st argument for the functions listed on this page.

procedure CkLog_Dispose(handle: HCkLog); stdcall;

Objects created by calling CkLog_Create must be freed by calling this method. A memory leak occurs if a handle is not disposed by calling this function.

Properties

DebugLogFilePath
procedure CkLog_getDebugLogFilePath(objHandle: HCkLog; outPropVal: HCkString); stdcall;
procedure CkLog_putDebugLogFilePath(objHandle: HCkLog; newPropVal: PWideChar); stdcall;
function CkLog__debugLogFilePath(objHandle: HCkLog): PWideChar; stdcall;

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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LastErrorHtml
procedure CkLog_getLastErrorHtml(objHandle: HCkLog; outPropVal: HCkString); stdcall;
function CkLog__lastErrorHtml(objHandle: HCkLog): PWideChar; stdcall;

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
procedure CkLog_getLastErrorText(objHandle: HCkLog; outPropVal: HCkString); stdcall;
function CkLog__lastErrorText(objHandle: HCkLog): PWideChar; stdcall;

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
procedure CkLog_getLastErrorXml(objHandle: HCkLog; outPropVal: HCkString); stdcall;
function CkLog__lastErrorXml(objHandle: HCkLog): PWideChar; stdcall;

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
function CkLog_getLastMethodSuccess(objHandle: HCkLog): wordbool; stdcall;
procedure CkLog_putLastMethodSuccess(objHandle: HCkLog; newPropVal: wordbool); stdcall;
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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VerboseLogging
function CkLog_getVerboseLogging(objHandle: HCkLog): wordbool; stdcall;
procedure CkLog_putVerboseLogging(objHandle: HCkLog; newPropVal: wordbool); stdcall;

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
procedure CkLog_getVersion(objHandle: HCkLog; outPropVal: HCkString); stdcall;
function CkLog__version(objHandle: HCkLog): PWideChar; stdcall;

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

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Methods

Clear
procedure CkLog_Clear(objHandle: HCkLog;
    initialTag: PWideChar) stdcall;
Introduced in version 9.5.0.44

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

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EnterContext
procedure CkLog_EnterContext(objHandle: HCkLog;
    tag: PWideChar) stdcall;
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.

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LeaveContext
procedure CkLog_LeaveContext(objHandle: HCkLog) stdcall;
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.)

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LogData
procedure CkLog_LogData(objHandle: HCkLog;
    tag: PWideChar;
    message: PWideChar) stdcall;
Introduced in version 9.5.0.44

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

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LogDataBase64
procedure CkLog_LogDataBase64(objHandle: HCkLog;
    tag: PWideChar;
    data: HCkByteData) stdcall;
Introduced in version 9.5.0.44

Logs binary data in base64 format.

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LogDataHex
procedure CkLog_LogDataHex(objHandle: HCkLog;
    tag: PWideChar;
    data: HCkByteData) stdcall;
Introduced in version 9.5.0.44

Logs binary data in hex format.

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LogDataMax
procedure CkLog_LogDataMax(objHandle: HCkLog;
    tag: PWideChar;
    message: PWideChar;
    maxNumChars: Integer) stdcall;
Introduced in version 9.5.0.44

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

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LogDateTime
procedure CkLog_LogDateTime(objHandle: HCkLog;
    tag: PWideChar;
    gmt: wordbool) stdcall;
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.

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LogError
procedure CkLog_LogError(objHandle: HCkLog;
    message: PWideChar) stdcall;
Introduced in version 9.5.0.44

Logs an error within the current context.

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LogInfo
procedure CkLog_LogInfo(objHandle: HCkLog;
    message: PWideChar) stdcall;
Introduced in version 9.5.0.44

Logs an informational message within the current context.

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LogInt
procedure CkLog_LogInt(objHandle: HCkLog;
    tag: PWideChar;
    value: Integer) stdcall;
Introduced in version 9.5.0.44

Logs an integer.

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LogInt64
procedure CkLog_LogInt64(objHandle: HCkLog;
    tag: PWideChar;
    value: Int64) stdcall;
Introduced in version 9.5.0.44

Logs a 64-bit integer.

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LogTimestamp
procedure CkLog_LogTimestamp(objHandle: HCkLog;
    tag: PWideChar) stdcall;
Introduced in version 9.5.0.44

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

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SaveLastError
function CkLog_SaveLastError(objHandle: HCkLog;
    path: PWideChar): wordbool; stdcall;

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

Returns True for success, False for failure.

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