vb.net generate barcode 128 A. Platform Integration in Visual Basic .NET

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Appendix A. Platform Integration
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Table A-8. Arguments of the EventLog.WriteEntry() Overloaded Method
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Argument Comments message The text of the event to write to the event log. A value from the EventLogEntryType enumeration identifying the type of event. type Valid values include Error, Warning, Information, SuccessAudit, and FailureAudit. The SuccessAudit and FailureAudit values are used only for security events. An application-specific event identifier. An application-specific category identifier. A byte array that holds binary data associated with the event.
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eventID category rawData
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The following example program periodically writes an entry to the Application log with the source name MyApp:
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using System; using System.Diagnostics; using System.Threading; public class EventLogWriter { public static void Main(String[] args) { // Create the EventLog instance and open the // "Application" log EventLog log = new EventLog("Application", ".", "MyApp"); // Loop and write an entry every 5 seconds while (true) { log.WriteEntry("Test Message", EventLogEntryType.Error, 200); Thread.Sleep(5000); } } }
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Reading from the Event Log
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Although applications are more likely to write to than read the event log, sometimes an application will read the event log. The EventLog.Entries property returns an EventLogEntryCollection containing EventLogEntry instances. Each EventLogEntry represents a single event log record and provides the properties detailed in Table A-9 to access the details of the event.
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Table A-9. EventLogEntry Properties
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Property Description Gets the text associated with the CategoryNumber of the entry. Category CategoryNumber Gets the category number of the entry. Gets the binary data associated with the entry. Data
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Appendix A. Platform Integration
Gets the event type of the entry. The returned value is a member of the EventLogEntryType enumeration; valid values are Error, Warning, Information, SuccessAudit, and FailureAudit. Gets the application-specific event ID for the entry. EventID Gets the index of the entry in the event log. Index MachineName Gets the name of the machine on which the entry was generated. Gets the message associated with the entry. Message Gets the source associated with the entry. Source TimeGenerated Gets the local time at which the entry was generated. Gets the local time at which the entry was written. TimeWritten Gets the name of the user responsible for logging the entry. UserName When an application reads from a log, the Source doesn't need to be specified; only the Log and MachineName properties are required. Changing the Log and MachineName properties of an existing EventLog instance provides access to the newly specified log. The following example opens the Application log on the local machine and counts the events generated by the source MyApp:
using System; using System.Diagnostics; public class EventLogReader { public static void Main() { // Create the EventLog instance and open the // "Application" log EventLog log = new EventLog("Application"); // Get the collection of log entries EventLogEntryCollection entries = log.Entries; // Declare a counter int count = 0; // Loop through the entries and count occurrences for // the "MyApp" source foreach (EventLogEntry entry in entries) { if (entry.Source == "MyApp") count++; } // Display count information for the source to the console Console.WriteLine("Logged events for MyApp = {0}", count);
EntryType
Creating and Deleting Custom Logs
There is no method to explicitly create a new log; if a source is registered against a log that doesn't exist, calls to the WriteEntry method will cause the log to be created automatically.
Appendix A. Platform Integration
The following statements show two distinct approaches to creating the MyApplicationLog log using a source named MySrc (assuming the log doesn't already exist):
// Using an EventLog instance EventLog e = new EventLog("MyApplicationLog", ".", "MySrc"); e.WriteEntry("A test message"); // Using EventLog static methods EventLog.CreateEventSource("MySrc", "MyApplicationLog"); EventLog.WriteEntry("MySrc", "A test message");
The existence of a log is determined using the static EventLog.Exists method, passing it a String argument containing the name of the log to test for. An overloaded version also accepts a machine name for testing the existence of a log on a remote machine. The static EventLog.Delete method accepts the same arguments as Exists but deletes the specified log if it exists; if the log doesn't exist, a System.SystemException is thrown.
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