The first step is to create the new log. you have to do this in the registry. open up regedit and navigate to: right click on the eventlog key and click new gt key name this new key the same name you want your new event log to be named. by default it will create the new.evt file here: c:\windows\system32\config\new key 1.evt you can always rename it by editing the string value data in the registry if you like. It will show you the way for writing custom log in c.net this article will introduce you how to write custom log event for your tool/program. If you are going to create a tool then most of the professional like to use event log for logging its information, error etc and user can view these log in event log viewer.

Whenever you are going to create custom event log it creates registry entry in hklm/ system/ services/ eventlog. For example if you are going to create custom log mylog then the registry entry for mylog will be hklm/ system/ services/ eventlog/mylog and event file will be stored in %systemroot%\system32\config\biopassw.evt path. If you want to change the path for event log file then you have to change the path in file key of event log. In event viewer we can see the log mylog having two event log entry for mylog written by writemylogentry function. Once you created source and if you want to change that source for other system or custom log then after creating the source with new custom/system event log you must have to restart the system.

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A set of c classes that work around issues with the standard eventlog object the eventlog class provided with the.net framework allows easy access to the nt event log subsystem but has some implementation features that restrict it's usefulness in fact, it is probably best described as a leaky abstraction . A good description of the issues summarised below is in section 2.5.1 of developing applications with visualstudio.net by richard grimes isbn 0 201 70852 3. The eventlogex class presented here works around these issues and enables applications to write to the event log in a manner similar to the current direct api calls for reading, the existing framework class works fine. When you access the event log using the standard nt api calls, the system stores a structure that contains amongst other things the message id and any replacement strings inserts for the message but it does not store the message text itself. When you read an entry from an event log, the system reads the stored message id and replacement strings, gets the text of the message for the current locale from a messagetable resource contained within the file specified in the eventmessagefile key in the registry, inserts the replacement strings, and returns you the formatted string. Under.net, message sources are registered with the eventmessagefile value always set to eventlogmessages.dll.

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The eventlogex class overcomes these issues and allows you to log messages from managed code with read time formatting of the messages based on the client locale i.e. For full api information, please refer to the ndoc generated documentation included in the.zip file eventlogex.chm the event logging service uses the information stored in the eventlog registry key hklm\system\currentcontrolset\services\eventlog the eventlog subkeys are called logfiles and are used to locate resources that the event logging service needs when an application writes to or reads from an event log. Each subkey has configuration values specific to that logfile which can be read or set using the relevant eventlogex properties. Lt ! the eventsource class > each logfile entry contains one or more subkeys called event sources which are the names of the software components that log events to that logfile normally this is the name of the application or the name of a subcomponent of the application, if the application is large. Event sources are stored under the hklm\system\currentcontrolset\services\eventlog\logname \appname key and contain information specific to the software that will be logging the events, and which can be read or written using the relevant eventsource properties. note: you cannot construct an instance of the eventsource class directly instead use the source property of an existing instance of the eventlogex class. Lt ! messagefile properties > the eventsource object exposes the messagefile properties in two versions local and remote e.g.

This is necessary because, to be able to view the text of events stored in a log on a remote machine, the local registry must have an event source entry that specifies the location of file that contains the messagetable resources. The remote machine must also have a similar one if the event is being written to a custom log file, otherwise the nt event service defaults to writing the messages to the application log if it is being written to the application log the entry is optional but recommended. The remote entry will also allow the events to be viewed in its event viewer if it also has the messagetable resource files installed but these are likely to be in a different directory than on the local machine and so the remote properties allow you to provide different paths for the local and remote paths if the source is local, calling the remote versions has no effect. The eventlogex class should be used as a replacement for the standard eventlog only when writing events when reading events, the existing eventlog class should be used.

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The main difference with the class is that, instead of using the writeentry method and passing it a string message, you use reportevent and pass it a message id. Lt ! points of interest > according to the documentation, any registered paths e.g. To the log file and message files should be of type reg_sz_expand but you cannot create an entry of this type using the standard.net registry classes you can only create reg_sz or reg_multi_sz types. This most notably affects the path to the actual log file as it should be under the system directory which, on a remote machine, may not be the same as the local one so you can't use just use the environment.systemdirectory value.

Using %systemroot% in the path without setting the type to reg_sz_expand does not work correctly as it will not be resolved when read. The solution that i have used is to read the systemroot value from the possibly remote registry and then use that to build the path up. Visualstudio.net does not contain an editor for messagetable resources although i am working on one so you currently need to create the message files in the same way as pre.net i.e. You can create one message file that contains descriptions for the event identifiers, categories, and parameters, or create three separate message files and several applications can share the same message file.

This can be used to convert the .h file into a c file that contains a single public class called messageids that contains the message ids as a set of public const uint values. This utility is simple to use: mcconvert filename.h this will generate a file called filename messages.cs that consists of a namespace called filename messages which contains a single messageids class, which in turn exposes the public const uint message ids which are named the same as the define entries in .h file and also the message text. This file can then be included in an existing solution and the ids used in the calls to the reportevent method of the eventlogex class. note: the messages ids are declared as public const uint values rather than a to some people more natural enumeration so that they can be passed directly to the reportevent method without the need to add a uint cast each time and reportevent can't be easily modified to take an enumeration as it will have a different type for each.h file. To build it, you should first run the buildmcdll.cmd batch file in the eventlogextest subdirectory which generates the.h/.cs files used by the program and also compiles the test.messages.dll file and copies it to the bin\debug directory so that the test application can locate it. November 12, 2002 initial posting the write eventlog cmdlet writes an event to an event log. To write an event to an event log, the event log must exist on the computer and the source must be registered for the event log.

The cmdlets that contain the eventlog noun the eventlog cmdlets work only on classic event logs. To get events from logs that use the windows event log technology in windows vista and later versions of windows, use get winevent. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its dispose method in a try /catch block.

To dispose of it indirectly, use a language construct such as using in c or using in visual basic. For more information, see the using an object that implements idisposable section in the idisposable interface topic. In addition to providing access to individual event logs and their entries, the eventlog class lets you access the collection of all event logs. You can use the static members of eventlog to delete logs, get log lists, create or delete a source, or determine if a computer already contains a particular source. Other applications and services you install, such as active directory, might have additional event logs. Eventlog requires eventlogpermission permissions for specific actions in the.net framework 2.0 and later versions, or full trust in the.net framework 1.0 and 1.1.

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You should never pass any event log object, including eventlogentrycollection and eventlogentry objects, to less trusted code. For example, creating an eventlog object, writing an entry, and then passing the eventlog object to partially trusted code can create a security issue, because the ability to read and write to the event log allows code to perform actions such as issuing event log messages in the name of another application. Starting with windows vista, user account control uac determines the credentials of a user. If you are a member of the built in administrators group, you are assigned two run time access tokens: a standard user access token and an administrator access token.