EventLogInstaller.CategoryCount Property

Reference

Definition

Namespace:: System.Diagnostics

Assembly:: System.Configuration.Install.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets or sets the number of categories in the category resource file.

public:
 property int CategoryCount { int get(); void set(int value); };

[System.Runtime.InteropServices.ComVisible(false)]
public int CategoryCount { get; set; }

[<System.Runtime.InteropServices.ComVisible(false)>]
member this.CategoryCount : int with get, set

Public Property CategoryCount As Integer

Property Value

Int32

The number of categories in the category resource file. The default value is zero.

Attributes: ComVisibleAttribute

Examples

The following code example sets the installation properties for a new event source. The code example sets the event source name, event log name, and resource file for localized event text.

#using <System.dll>
#using <System.Configuration.Install.dll>

using namespace System;
using namespace System::Configuration::Install;
using namespace System::Diagnostics;
using namespace System::ComponentModel;

[RunInstaller(true)]
public ref class SampleEventLogInstaller : public Installer
{
private:
   EventLogInstaller^ myEventLogInstaller;

public:
   SampleEventLogInstaller()
   {
      
      // Create an instance of an EventLogInstaller.
      myEventLogInstaller = gcnew EventLogInstaller;
      
      // Set the source name of the event log.
      myEventLogInstaller->Source = "ApplicationEventSource";
      
      // Set the event log into which the source writes entries.
      //myEventLogInstaller.Log = "MyCustomLog";
      myEventLogInstaller->Log = "myNewLog";
      
      // Set the resource file for the event log.
      // The message strings are defined in EventLogMsgs.mc; the message 
      // identifiers used in the application must match those defined in the
      // corresponding message resource file. The messages must be built
      // into a Win32 resource library and copied to the target path on the
      // system.  
      myEventLogInstaller->CategoryResourceFile =
             Environment::SystemDirectory + "\\eventlogmsgs.dll";
      myEventLogInstaller->CategoryCount = 3;
      myEventLogInstaller->MessageResourceFile =
             Environment::SystemDirectory + "\\eventlogmsgs.dll";
      myEventLogInstaller->ParameterResourceFile =
             Environment::SystemDirectory + "\\eventlogmsgs.dll";

      // Add myEventLogInstaller to the installer collection.
      Installers->Add( myEventLogInstaller );
   }

};

int main()
{
   Console::WriteLine( "Usage: InstallUtil.exe [<install>.exe | <install>.dll]" );
}

using System;
using System.Configuration.Install;
using System.Diagnostics;
using System.ComponentModel;

[RunInstaller(true)]
public class SampleEventLogInstaller : Installer
{
    private EventLogInstaller myEventLogInstaller;

    public SampleEventLogInstaller()
    {
        // Create an instance of an EventLogInstaller.
        myEventLogInstaller = new EventLogInstaller();

        // Set the source name of the event log.
        myEventLogInstaller.Source = "ApplicationEventSource";

        // Set the event log into which the source writes entries.
        //myEventLogInstaller.Log = "MyCustomLog";
        myEventLogInstaller.Log = "myNewLog";

        // Set the resource file for the event log.
        // The message strings are defined in EventLogMsgs.mc; the message
        // identifiers used in the application must match those defined in the
        // corresponding message resource file. The messages must be built
        // into a Win32 resource library and copied to the target path on the
        // system.

        myEventLogInstaller.CategoryResourceFile =
             Environment.SystemDirectory + "\\eventlogmsgs.dll";
        myEventLogInstaller.CategoryCount = 3;
        myEventLogInstaller.MessageResourceFile =
             Environment.SystemDirectory + "\\eventlogmsgs.dll";
        myEventLogInstaller.ParameterResourceFile =
             Environment.SystemDirectory + "\\eventlogmsgs.dll";

        // Add myEventLogInstaller to the installer collection.
        Installers.Add(myEventLogInstaller);
    }

    public static void Main()
    {
        Console.WriteLine("Usage: InstallUtil.exe [<install>.exe | <install>.dll]");
    }
}

   Imports System.Configuration.Install
Imports System.Diagnostics
Imports System.ComponentModel

<RunInstaller(True)>  _
Public Class SampleEventLogInstaller
   Inherits Installer

   Private myEventLogInstaller As EventLogInstaller

   Public Sub New()

      ' Create an instance of an EventLogInstaller.
      myEventLogInstaller = New EventLogInstaller()

      ' Set the source name of the event log.
      myEventLogInstaller.Source = "ApplicationEventSource"

      ' Set the event log into which the source writes entries.
      myEventLogInstaller.Log = "MyCustomLog"

      ' Set the resource file for the event log.
      ' The message strings are defined in EventLogMsgs.mc; the message
      ' identifiers used in the application must match those defined in the
      ' corresponding message resource file. The messages must be built
      ' into a Win32 resource library and copied to the target path on the
      ' system.

      myEventLogInstaller.CategoryResourceFile = _
          Environment.SystemDirectory + "\eventlogmsgs.dll"
      myEventLogInstaller.CategoryCount = 3
      myEventLogInstaller.MessageResourceFile = _
          Environment.SystemDirectory + "\eventlogmsgs.dll"
      myEventLogInstaller.ParameterResourceFile = _
          Environment.SystemDirectory + "\eventlogmsgs.dll"

      ' Add myEventLogInstaller to the installer collection.
      Installers.Add(myEventLogInstaller)

   End Sub

   Public Shared Sub Main()
     Console.WriteLine("Usage: InstallUtil.exe [<install>.exe | <install>.dll]")
   End Sub
End Class

The code example uses the following message text file, built into the resource library EventLogMsgs.dll. A message text file is the source from which the message resource file is created. The message text file defines the resource identifiers and text for the category, event message, and parameter insertion strings.

; // EventLogMsgs.mc
; // ********************************************************

; // Use the following commands to build this file:

; //   mc -s EventLogMsgs.mc
; //   rc EventLogMsgs.rc
; //   link /DLL /SUBSYSTEM:WINDOWS /NOENTRY /MACHINE:x86 EventLogMsgs.Res
; // ********************************************************

; // - Event categories -
; // Categories must be numbered consecutively starting at 1.
; // ********************************************************

MessageId=0x1
Severity=Success
SymbolicName=INSTALL_CATEGORY
Language=English
Installation
.

MessageId=0x2
Severity=Success
SymbolicName=QUERY_CATEGORY
Language=English
Database Query
.

MessageId=0x3
Severity=Success
SymbolicName=REFRESH_CATEGORY
Language=English
Data Refresh
.

; // - Event messages -
; // *********************************

MessageId = 1000
Severity = Success
Facility = Application
SymbolicName = AUDIT_SUCCESS_MESSAGE_ID_1000
Language=English
My application message text, in English, for message id 1000, called from %1.
.

MessageId = 1001
Severity = Warning
Facility = Application
SymbolicName = AUDIT_FAILED_MESSAGE_ID_1001
Language=English
My application message text, in English, for message id 1001, called from %1.
.

MessageId = 1002
Severity = Success
Facility = Application
SymbolicName = GENERIC_INFO_MESSAGE_ID_1002
Language=English
My generic information message in English, for message id 1002.
.

MessageId = 1003
Severity = Warning
Facility = Application
SymbolicName = GENERIC_WARNING_MESSAGE_ID_1003
Language=English
My generic warning message in English, for message id 1003, called from %1.
.

MessageId = 1004
Severity = Success
Facility = Application
SymbolicName = UPDATE_CYCLE_COMPLETE_MESSAGE_ID_1004
Language=English
The update cycle is complete for %%5002.
.

MessageId = 1005
Severity = Warning
Facility = Application
SymbolicName = SERVER_CONNECTION_DOWN_MESSAGE_ID_1005
Language=English
The refresh operation did not complete because the connection to server %1 could not be established.
.

; // - Event log display name -
; // ********************************************************

MessageId = 5001
Severity = Success
Facility = Application
SymbolicName = EVENT_LOG_DISPLAY_NAME_MSGID
Language=English
Sample Event Log
.

; // - Event message parameters -
; //   Language independent insertion strings
; // ********************************************************

MessageId = 5002
Severity = Success
Facility = Application
SymbolicName = EVENT_LOG_SERVICE_NAME_MSGID
Language=English
SVC_UPDATE.EXE
.

Remarks

Use the CategoryCount and CategoryResourceFile properties to write events with localized category strings. The Event Viewer displays the category for an event entry, if you supply a category when you write the event. Event log categories are application-defined strings that help filter events, or provide information on an event. For example, your application can define separate categories for different components or different operations.

Event categories are optional; if your application does not use categories, do not set the CategoryCount and CategoryResourceFile properties.

For details about defining event messages and building event resource files, see the Message Compiler article in the Platform SDK documentation.

Applies to

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