DOCUMENT:Q216146 11-JAN-2001 [vbwin] TITLE :HOWTO:Get Number of Windows NT Event Log Records in Visual Basic PRODUCT :Microsoft Visual Basic for Windows PROD/VER:WINDOWS:4.0,5.0,6.0 OPER/SYS: KEYWORDS:kbAPI kbEventLog kbOSWinNT kbSDKWin32 kbVBp kbVBp400 kbVBp500 kbVBp600 kbGrpDSVB kbDSup ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Standard Edition, 32-bit, for Windows, version 4.0 - Microsoft Visual Basic Professional Edition, 32-bit, for Windows, version 4.0 - Microsoft Visual Basic Enterprise Edition, 32-bit, for Windows, version 4.0 - Microsoft Visual Basic Learning Edition for Windows, versions 5.0, 6.0 - Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 - Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 ------------------------------------------------------------------------------- SUMMARY ======= Event logging in Windows provides a standard, centralized way for Windows and other applications to record important software and hardware events. Event logging also supplies a standard user interface for viewing the logs and a programming interface for examining the logs. This article illustrates how to get the number of records contained within a specified Microsoft Windows 2000 or Windows NT Event Log with Visual Basic version 4.0 and later. This can be done using the GetNumberOfEventLogRecords API call. While Visual Basic 5.0 and later versions have built in functionality for event logging, they do not provide the functionality that the Win32 API does. MORE INFORMATION ================ The following example shows how to get the number of event log records in the local Application Event Log. Step by Step Example: 1. Create a new Visual Basic project. Form1 is created by default. 2. Add a command button to Form1. Change the name of the command button to cmdGetNumberOfEventLogRecords. 3. Add the following code to the Form1 code window: Private Declare Function GetNumberOfEventLogRecords Lib "advapi32.dll" ( _ ByVal hEventLog As Long, _ NumberOfRecords As Long) _ As Long Private Declare Function CloseEventLog Lib "advapi32.dll" ( _ ByVal hEventLog As Long) _ As Long Private Declare Function OpenEventLog Lib "advapi32.dll" Alias "OpenEventLogA" ( _ ByVal lpUNCServerName As String, _ ByVal lpSourceName As String) _ As Long Private Sub cmdGetNumberOfEventLogRecords_Click() Dim hEventLog As Long Dim lEventLogRecordCount As Long Dim lretv As Long hEventLog = OpenEventLog(vbNullString, "Application") If hEventLog = 0 Then Debug.Print "OpenEventLog Failed" Exit Sub End If lretv = GetNumberOfEventLogRecords(hEventLog, lEventLogRecordCount) If lretv = 0 Then Debug.Print GetNumberOfEventLogRecords Failed" Exit Sub Else Debug.Print "Number of records: " & CStr(lEventLogRecordCount) End If lretv = CloseEventLog(hEventLog) If lretv = 0 Then Debug.Print "CloseEventLog Failed" Exit Sub End If End Sub 4. Press F5 to run the project, and then and click the cmdGetNumberOfEventLogRecords command button. A message box should appear that displays the number of records. REFERENCES ========== For additional information on event logging from Visual Basic, click the article numbers below to view the articles in the Microsoft Knowledge Base: Q154576 HOWTO: Write to the Windows NT Event Log from Visual Basic Q161306 INFO: App.LogEvent Only Logs in Compiled Applications Q184747 INFO: Event Logging in Visual Basic Q216097 HOWTO: Clear the NT Event Log in Visual Basic Q216089 HOWTO: Backup the NT Event Log in Visual Basic Additional query words: ====================================================================== Keywords : kbAPI kbEventLog kbOSWinNT kbSDKWin32 kbVBp kbVBp400 kbVBp500 kbVBp600 kbGrpDSVB kbDSupport kbCodeSnippet Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600 kbVB400Search kbVB400 Version : WINDOWS:4.0,5.0,6.0 Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.