1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<fpdoc-descriptions>
<package name="fcl">
<!--
====================================================================
eventlog
====================================================================
-->
<module name="eventlog">
<short>Unit implementing system log class</short>
<descr>
<p>The <file>EventLog</file> unit implements the <link id="TEventLog"/>
component, which is a component that can be used to send log messages to the
system log (if it is available) or to a file.</p>
</descr>
<!-- unresolved type reference Visibility: default -->
<element name="SysUtils">
<short>Exception and string formatting support.</short>
</element>
<!-- unresolved type reference Visibility: default -->
<element name="Classes">
<short><var>TComponent</var> and other classes support.</short>
</element>
<!--
********************************************************************
#fcl.eventlog.TEventLog
********************************************************************
-->
<!-- enumeration type Visibility: default -->
<element name="TEventType">
<short>Type of event</short>
<descr>
<var>TEventType</var> determines the type of event. Depending on the system
logger, the log event may end up in different places, or may be displayed in
a different manner. A suitable mapping is shown for each system. In the case
of Windows, the formatting of the message is done differently, and a
different icon is shown for each type of message.
</descr>
</element>
<!-- enumeration value Visibility: default -->
<element name="TEventType.etCustom">
<short>Custom event type.</short>
</element>
<!-- enumeration value Visibility: default -->
<element name="TEventType.etInfo">
<short>Informational event</short>
</element>
<!-- enumeration value Visibility: default -->
<element name="TEventType.etWarning">
<short>Warning event</short>
</element>
<!-- enumeration value Visibility: default -->
<element name="TEventType.etError">
<short>Error event</short>
</element>
<!-- enumeration value Visibility: default -->
<element name="TEventType.etDebug">
<short>Debug event</short>
</element>
<!-- enumeration type Visibility: default -->
<element name="TLogType">
<short>Type of log</short>
<descr>
<p>
<var>TLogType</var> determines where the log messages are written.
It is the type of the <link id="TEventLog.LogType"/> property. It can have 2
values:
</p>
<dl>
<dt>ltFile</dt>
<dd>This is used to write all messages to file. if no system logging
mechanism exists, this is used as a fallback mechanism.</dd>
<dt>ltSystem</dt>
<dd>This is used to send all messages to the system log mechanism. Which log
mechanism this is, depends on the operating system.</dd>
</dl>
</descr>
<seealso>
<link id="TEventLog.LogType"/>
</seealso>
</element>
<!-- enumeration value Visibility: default -->
<element name="TLogType.ltSystem">
<short>Use the system log</short>
</element>
<!-- enumeration value Visibility: default -->
<element name="TLogType.ltFile">
<short>Write to file</short>
</element>
<!-- procedure type Visibility: default -->
<element name="TLogCodeEvent">
<short>Callback type to retrieve custom event codes</short>
<descr>
<var>TLogCodeEvent</var> is the event type for the <link
id="TEventLog.OnGetCustomEvent">OnGetCustomEvent</link> and
<link id="TEventLog.OnGetCustomEventID">OnGetCustomEventID</link>
event handlers. It should return a OS system log code for the
<var>etCustom</var> log event or event ID type in the <var>Code</var> parameter.
</descr>
<seealso>
<link id="TEventLog.OnGetCustomEvent"/>
<link id="TEventLog.OnGetCustomEventID"/>
<link id="TLogCategoryEvent"/>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TLogCodeEvent.Sender">
<short><var>TEventLog</var> instance that triggered the event</short>
</element>
<!-- argument Visibility: default -->
<element name="TLogCodeEvent.Code">
<short>Code to return</short>
</element>
<!-- procedure type Visibility: default -->
<element name="TLogCategoryEvent">
<short>Callback type to return custom category code</short>
<descr>
<var>TLogCategoryEvent</var> is the event type for the <link
id="TEventLog.OnGetCustomCategory"/> event handler. It should
return a OS event category code for the <var>etCustom</var>
log event type in the <var>Code</var> parameter.
</descr>
<seealso>
<link id="TEventLog.OnGetCustomCategory"/>
<link id="TLogCodeEvent"/>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TLogCategoryEvent.Sender">
<short><var>TEventLog</var> instance that triggered the event</short>
</element>
<!-- argument Visibility: default -->
<element name="TLogCategoryEvent.Code">
<short>OS category code</short>
</element>
<!-- object Visibility: default -->
<element name="TEventLog">
<short>Event logging class</short>
<descr>
<var>TEventLog</var> is a component which can be used to send messages to
the system log. In case no system log exists (such as on Windows 95/98 or
DOS), the messages are written to a file. Messages can be logged using the
general <link id="TEventLog.Log">Log</link> call, or the specialized
<link id="TEventLog.Warning">Warning</link>,
<link id="TEventLog.Error">Error</link>,
<link id="TEventLog.Info">Info</link> or
<link id="TEventLog.Debug">Debug</link> calls, which have the event type
predefined.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
<link id="TEventLog.Warning">Warning</link>
<link id="TEventLog.Error">Error</link>
<link id="TEventLog.Info">Info</link>
<link id="TEventLog.Debug">Debug</link>
</seealso>
</element>
<!-- destructor Visibility: public -->
<element name="TEventLog.Destroy">
<short>Clean up <var>TEventLog</var> instance</short>
<descr>
<var>Destroy</var> cleans up the <var>TEventLog</var> instance.
It cleans any log structures that might have been set up to
perform logging, by setting the <link id="TEventLog.Active">Active</link>
property to False.
</descr>
<seealso>
<link id="TEventLog.Active">Active</link>
</seealso>
</element>
<!-- function Visibility: public -->
<element name="TEventLog.EventTypeToString">
<short>Create a string representation of an event type</short>
<descr>
<var>EventTypeToString</var> converts the event type <var>E</var> to a
suitable string representation for logging purposes. It's mainly used when
writing messages to file, as the system log usually has it's own mechanisms
for displaying the various event types.
</descr>
<seealso>
<link id="#rtl.sysutils.TEventType"/>
</seealso>
</element>
<!-- function result Visibility: default -->
<element name="TEventLog.EventTypeToString.Result">
<short>String representation of <var>E</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.EventTypeToString.E">
<short>Event type to convert to string</short>
</element>
<!-- function Visibility: public -->
<element name="TEventLog.RegisterMessageFile">
<short>Register message file</short>
<descr>
<p>
<var>RegisterMessageFile</var> is used on Windows to register the file
<var>AFileName</var> containing the formatting strings for the system
messages. This should be a file containing resource strings. If
<var>AFileName</var> is empty, the filename of the application binary is
substituted.
</p>
<p> When a
message is logged to the windows system log, Windows looks for
a formatting string in the file registered with this call.
</p>
<p>
There are 2 kinds of formatting strings:
</p>
<p>
<b>Category strings</b> these should be numbered from 1 to 4
</p>
<dl>
<dt>1</dt><dd>Should contain the description of the <var>etInfo</var> event type.</dd>
<dt>2</dt><dd>Should contain the description of the <var>etWarning</var> event type.</dd>
<dt>4</dt><dd>Should contain the description of the <var>etError</var> event type.</dd>
<dt>4</dt><dd>Should contain the description of the <var>etDebug</var> event type.</dd>
</dl>
<p>
None of these strings should have a string substitution placeholder.
</p>
<p>
The second type of strings are the <b>message definitions</b>. Their number starts
at <link id="TEventLog.EventIDOffset">EventIDOffset</link> (default is 1000)
and each string should have 1 placeholder.
</p>
<p>
Free Pascal comes with a <file>fclel.res</file> resource file which contains
default values for the 8 strings, in English. It can be linked in the
application binary with the statement
</p>
<code>
{$R fclel.res}
</code>
<p>
This file is generated from the <file>fclel.mc</file> and <file>fclel.rc</file>
files that are distributed with the Free Pascal sources.
</p>
<p>
If the strings are not registered, windows will still display the event
messages, but they will not be formatted nicely.
</p>
<p>
Note that while any messages logged with the event logger are displayed in
the event viewer in Windows locks the file registered here. This usually
means that the binary is locked.
</p>
<p>
On non-windows operating systems, this call is ignored.
</p>
</descr>
<errors>
If <var>AFileName</var> is invalid, false is returned.
</errors>
</element>
<!-- function result Visibility: default -->
<element name="TEventLog.RegisterMessageFile.Result">
<short><var>True</var> if the call was successful, <var>False</var> if not.</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.RegisterMessageFile.AFileName">
<short>Filename with messages as resource strings.</short>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Log">
<short>Log a message to the system log.</short>
<descr>
<p>
<var>Log</var> sends a log message to the system log. The message is either
the parameter <var>Msg</var> as is, or is formatted from the <var>Fmt</var>
and <var>Args</var> parameters. If <var>EventType</var> is specified, then
it is used as the message event type. If <var>EventType</var> is omitted,
then the event type is determined from
<link id="TEventLog.DefaultEventType">DefaultEventType</link>.
</p>
<p>
If <var>EventType</var> is <var>etCustom</var>, then the
<link id="TEventLog.OnGetCustomEvent">OnGetCustomEvent</link>,
<link id="TEventLog.OnGetCustomEventID">OnGetCustomEventID</link> and
<link id="TEventLog.OnGetCustomCategory">OnGetCustomCategory</link>.
</p>
<p>
The other logging calls: <link id="TEventLog.Info">Info</link>,
<link id="TEventLog.Warning">Warning</link>,
<link id="TEventLog.Error">Error</link> and
<link id="TEventLog.Debug">Debug</link> use the <var>Log</var>
call to do the actual work.
</p>
</descr>
<seealso>
<link id="TEventLog.Info">Info</link>
<link id="TEventLog.Warning">Warning</link>
<link id="TEventLog.Error">Error</link>
<link id="TEventLog.Debug">Debug</link>
<link id="TEventLog.OnGetCustomEvent">OnGetCustomEvent</link>
<link id="TEventLog.OnGetCustomEventID">OnGetCustomEventID</link>
<link id="TEventLog.OnGetCustomCategory">OnGetCustomCategory</link>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Log.EventType">
<short>Event type to use.</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Log.Msg">
<short>Complete log message</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Log.Fmt">
<short>Format string for <var>Args</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Log.Args">
<short>Arguments to be formatted with <var>Fmt</var></short>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Warning">
<short>Log a warning message.</short>
<descr>
<var>Warning</var> is a utility function which logs a message with the
<var>etWarning</var> type. The message is either the parameter <var>Msg</var>
as is, or is formatted from the <var>Fmt</var> and <var>Args</var> parameters.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
<link id="TEventLog.Info">Info</link>
<link id="TEventLog.Error">Error</link>
<link id="TEventLog.Debug">Debug</link>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Warning.Msg">
<short>Complete warning message</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Warning.Fmt">
<short>Formatting string for <var>Args</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Warning.Args">
<short>Arguments to format message with</short>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Error">
<short>Log an error message to</short>
<descr>
<var>Error</var> is a utility function which logs a message with the
<var>etError</var> type. The message is either the parameter
<var>Msg</var> as is, or is formatted from the <var>Fmt</var>
and <var>Args</var> parameters.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
<link id="TEventLog.Info">Info</link>
<link id="TEventLog.Warning">Warning</link>
<link id="TEventLog.Debug">Debug</link>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Error.Msg">
<short>Complete error message</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Error.Fmt">
<short>Formatting string for <var>Args</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Error.Args">
<short>Arguments to format message with</short>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Debug">
<short>Log a debug message</short>
<descr>
<var>Debug</var> is a utility function which logs a message with the
<var>etDebug</var> type. The message is either the parameter
<var>Msg</var> as is, or is formatted from the <var>Fmt</var>
and <var>Args</var> parameters.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
<link id="TEventLog.Info">Info</link>
<link id="TEventLog.Warning">Warning</link>
<link id="TEventLog.Error">Error</link>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Debug.Msg">
<short>Complete debug message</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Debug.Fmt">
<short>Formatting string for <var>Args</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Debug.Args">
<short>Arguments to format message with</short>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Info">
<short>Log an informational message</short>
<descr>
<var>Info</var> is a utility function which logs a message with the
<var>etInfo</var> type. The message is either the parameter
<var>Msg</var> as is, or is formatted from the <var>Fmt</var>
and <var>Args</var> parameters.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
<link id="TEventLog.Warning">Warning</link>
<link id="TEventLog.Error">Error</link>
<link id="TEventLog.Debug">Debug</link>
</seealso>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Info.Msg">
<short>Complete information message</short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Info.Fmt">
<short>Formatting string for <var>Args</var></short>
</element>
<!-- argument Visibility: default -->
<element name="TEventLog.Info.Args">
<short>Arguments to format message with</short>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.Identification">
<short>Identification string for messages</short>
<descr>
<var>Identification</var> is used as a string identifying the source of the
messages in the system log. If it is empty, the filename part of the application
binary is used.
</descr>
<seealso>
<link id="TEventLog.Active">Active</link>
<link id="TEventLog.TimeStampFormat">TimeStampFormat</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.LogType">
<short>Log type</short>
<descr>
<var>LogType</var> is the type of the log: if it is <var>ltSystem</var>,
then the system log is used, if it is available. If it is <var>ltFile</var>
or there is no system log available, then the log messages are written to a
file. The name for the log file is taken from the <link
id="TEventLog.FileName">FileName</link> property.
</descr>
<seealso>
<link id="TEventLog.FileName">FileName</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.Active">
<short>Activate the log mechanism</short>
<descr>
<p>
<var>Active</var> determines whether the log mechanism is active: if set to
<var>True</var>, the component connects to the system log mechanism, or
opens the log file if needed. Any attempt to log a message while the log is
not active will try to set this property to <var>True</var>. Disconnecting from the system log or
closing the log file is done by setting the <var>Active</var> property to
<var>False</var>.
</p>
<p>
If the connection to the system logger fails, or the log file cannot be
opened, then setting this property may result in an exception.
</p>
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.DefaultEventType">
<short>Default event type for the <link
id="#fcl.eventlog.TEventLog.Log">Log</link> call.</short>
<descr>
<var>DefaultEventType</var> is the event type used by the <link
id="TEventLog.Log">Log</link> call if it's <var>EventType</var> parameter
is omitted.
</descr>
<seealso>
<link id="TEventLog.Log">Log</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.FileName">
<short>File name for log file</short>
<descr>
<var>FileName</var> is the name of the log file used to log messages if no
system logger is available or the <link id="TEventLog.LogType">LogType</link>
is <var>ltFile</var>. If none is specified, then the name of the application
binary is used, with the extension replaced by <file>.log</file>. The file
is then located in the <file>/tmp</file> directory on UNIX-like systems, or
in the application directory for Dos/Windows like systems.
</descr>
<seealso>
<link id="TEventlog.LogType">LogType</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.TimeStampFormat">
<short>Format for the timestamp string</short>
<descr>
<var>TimeStampFormat</var> is the formatting string used to create a
timestamp string when writing log messages to file. It should have a format
suitable for the <link
id="#rtl.sysutils.formatdateTime">FormatDateTime</link> call. If it is left
empty, then <var>yyyy-mm-dd hh:nn:ss.zzz</var> is used.
</descr>
<seealso>
<link id="TEventLog.Identification"/>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.CustomLogType">
<short>Custom log type ID</short>
<descr>
<var>CustomLogType</var> is used in the <link
id="TEventLog.EventTypeToString">EventTypeToString</link> to format the custom log
event type string.
</descr>
<seealso>
<link id="TEventLog.EventTypeToString">EventTypeToString</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.EventIDOffset">
<short>Offset for event ID messages identifiers</short>
<descr>
<p>
<var>EventIDOffset</var> is the offset for the message formatting strings in the windows resource
file. This property is ignored on other platforms.
</p>
<p>
The message strings in the file registered with the <link
id="TEventLog.RegisterMessageFile">RegisterMessageFile</link> call are
windows resource strings. They each have a unique ID, which must be
communicated to windows. In the resource file distributed by Free Pascal,
the resource strings are numbered from 1000 to 1004. The actual number
communicated to windows is formed by adding the ordinal value of the
message's eventtype to <var>EventIDOffset</var> (which is by default 1000),
which means that by default, the string numbers are:
</p>
<dl>
<dt>1000</dt><dd>Custom event types</dd>
<dt>1001</dt><dd>Information event type</dd>
<dt>1002</dt><dd>Warning event type</dd>
<dt>1003</dt><dd>Error event type</dd>
<dt>1004</dt><dd>Debug event type</dd>
</dl>
</descr>
<seealso>
<link id="TEventLog.RegisterMessageFile">RegisterMessageFile</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.OnGetCustomCategory">
<short>Event to retrieve custom message category</short>
<descr>
<var>OnGetCustomCategory</var> is called on the windows platform to
determine the category of a custom event type. It should return an ID
which will be used by windows to look up the string which describes the
message category in the file containing the resource strings.
</descr>
<seealso>
<link id="TEventLog.OnGetCustomEventID">OnGetCustomEventID</link>
<link id="TEventLog.OnGetCustomEvent">OnGetCustomEvent</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.OnGetCustomEventID">
<short>Event to retrieve custom event ID</short>
<descr>
<var>OnGetCustomEventID</var> is called on the windows platform to
determine the category of a custom event type. It should return an ID
which will be used by windows to look up the string which formats the
message, in the file containing the resource strings.
</descr>
<seealso>
<link id="TEventLog.OnGetCustomCategory">OnGetCustomCategory</link>
<link id="TEventLog.OnGetCustomEvent">OnGetCustomEvent</link>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.OnGetCustomEvent">
<short>Event to retrieve custom event Code</short>
<descr>
<var>OnGetCustomEvent</var> is called on the windows platform to
determine the event code of a custom event type. It should return
an ID.
</descr>
<seealso>
<link id="TEventLog.OnGetCustomCategory">OnGetCustomCategory</link>
<link id="TEventLog.OnGetCustomEventID">OnGetCustomEventID</link>
</seealso>
</element>
<!--
********************************************************************
#fcl.eventlog.ELogError
********************************************************************
-->
<!-- object Visibility: default -->
<element name="ELogError">
<short>Exception raised on errors in the <var>TEventLog</var> component</short>
<descr>
<var>ELogError</var> is the exception used in the <link id="TEventLog"/>
component to indicate errors.
</descr>
<seealso>
<link id="TEventLog"/>
</seealso>
</element>
<!-- resource string Visibility: default -->
<element name="SLogInfo">
<short>Informational message name</short>
</element>
<!-- resource string Visibility: default -->
<element name="SLogWarning">
<short>Warning message name</short>
</element>
<!-- resource string Visibility: default -->
<element name="SLogError">
<short>Error message name</short>
</element>
<!-- resource string Visibility: default -->
<element name="SLogDebug">
<short>Debug message name</short>
</element>
<!-- resource string Visibility: default -->
<element name="SLogCustom">
<short>Custom message formatting string</short>
</element>
<element name="SErrLogFailedMsg">
<short>Message used to format an error when an error exception is raised.</short>
</element>
<element name="TEventLog.RaiseExceptionOnError">
<short>Determines whether logging errors are reported or ignored</short>
<descr>
<var>RaiseExceptionOnError</var> determines whether an error during a
logging operation will be signaled with an exception or not. If set to
<var>False</var>, errors will be silently ignored, thus not disturbing
normal operation of the program.
</descr>
</element>
<element name="TEventLog.UnRegisterMessageFile">
<short>Unregister the message file (needed on windows only)</short>
<descr>
<var>UnRegisterMessageFile</var> can be used to unregister a message file
previously registered with <link id="TEventLog.RegisterMessageFile"/>. This
function is usable only on windows, it has no effect on other platforms.
Note that windows locks the registered message file while viewing messages, so
unregistering helps to avoid file locks while event viewer is open.
</descr>
<seealso>
<link id="TEventLog.RegisterMessageFile"/>
</seealso>
</element>
<!-- function result Visibility: default -->
<element name="TEventLog.UnRegisterMessageFile.Result">
<short>True if the message file was successfully unregistered, false if an
error occurred.</short>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.AppendContent">
<short>Control whether output is appended to an existing file</short>
<descr>
<var>AppendContent</var> determines what is done when the log type is
<var>ltFile</var> and a log file already exists. If the log file already
exists, then the default behaviour (<var>AppendContent=False</var>) is
to re-create the log file when the log is activated.
If <var>AppendContent</var> is <var>True</var> then output will be appended
to the existing file.
</descr>
<seealso>
<link id="TEventLog.LogType">LogType</link>
<link id="TEventLog.FileName">FileName</link>
</seealso>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Pause">
<short>Pause the sending of log messages.</short>
<descr>
<p>
<var>Pause</var> temporarily suspends the sending of log messages.
the various log calls will simply eat the log message and return as if the
message was sent.
</p>
<p>
The sending can be resumed by calling <link id="TEventLog.Resume">Resume</link>.
</p>
</descr>
<seealso>
<link id="TEventLog.Resume"/>
<link id="TEventLog.Paused"/>
</seealso>
</element>
<!-- procedure Visibility: public -->
<element name="TEventLog.Resume">
<short>Resume sending of log messages if sending was paused</short>
<descr>
<var>Resume</var> resumes the sending of log messages if sending was paused through
<link id="Pause"/>.
</descr>
<seealso>
<link id="TEventLog.Pause"/>
<link id="TEventLog.Paused"/>
</seealso>
</element>
<!-- property Visibility: published -->
<element name="TEventLog.Paused">
<short>Is the message sending paused ?</short>
<descr>
<var>Paused</var> indicates whether the sending of messages is temporarily suspended or not.
Setting it to <var>True</var> has the same effect as calling <link id="TEventLog.Pause">Pause</link>.
Setting it to <var>False</var> has the same effect as calling <link id="TEventLog.Resume">Resume</link>.
</descr>
<seealso>
<link id="TEventLog.Pause"/>
<link id="TEventLog.Resume"/>
</seealso>
</element>
</module> <!-- eventlog -->
</package>
</fpdoc-descriptions>
|