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<!--RM_ID:133-->
<!--TITLE:Log Object-->
<!--H1:Log Object-->
<!--DESCRIPTION:An object for logging parameters of DirectShow graphs, filters, streams and  messages from applications/libraries.-->
<!--KEYWORDS:Log Logging Trace DirectShow Graph-->
{{This|products/freeware_filters/Log_object.html}}

{{Log object: Description}}

==Overview==

The '''Log object''' is great tool for debugging your DirectShow application.

==Features==

The log object writes to the file:
* Computer and OS Windows settings.
* Host application and loaded DLL parameters.
* Messages from filters, DLLs and application.

Third party applications can use the '''OutputDebugStringA()''' and '''OutputDebugStringW()''' methods to write to a log file.

==Usage==

To prepare files with the studied features and properties, do the following:

1. Download {{Log Object}} and unzip log_object.<version>.zip to some catalog.

2. Run register.bat. <b>Please, set check box in "Make this copy..." - shown on Log_register.gif.</b> Also - don't forget name of selected catalog for save log file.

3. Register a debug version of the AVObject filter you are checking, or download and install {{Spy Filter}}.

3. Run your application or graph (the Debug version of the AVObject filter or the Spy filter must be included in the graph).

4. Zip the log file and send it to us or upload to our [[AVObjects FTP|FTP]].

Notes:
* Only debug version of our filters will write the log file. Please make sure a debug version is registered.
* Please remember to unregister the log object after use. Log files can be VERY large (up to hundreds of GB) if the option “Add new log to the end of the old file” is selected (default option).

<br>You can find the path to the 32-bit log object in the following registry key:
 HKEY_CURRENT_USER\Software\_DSTLLOG
and to the 64-bit:
    HKEY_CURRENT_USER\Software\_DSTLLOG64

These keys have subkeys with paths to log32.dll and log64.dll. Also, these subkeys have a "Log" parameter with the value: path to the log file and other parameters.

==Related Products==

* {{LinkDescription|Video Generator}}
* {{LinkDescription|Spy Filter}}

==See Also==

* [[Log Object: Release Notes]]
* [[Problem Description Guidelines]]
* [[AVObjects FTP]]

===Action Items===

* Download {{Log Object}}
* Download {{Spy Filter}}
* {{Contact Support}}
* {{Place Order!}}

[[Category:Freeware Filters]]
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