How to export Windows System and Application event log?

Question

Using the EvtExportLog function, I currently fail to specify a correct value for the Path and/or Query parameter.

My goal is to export the local Application and System event log.

I've tried:

EvtExportLog(
    IntPtr.Zero, 
    "Application", 
    "*", 
    "C:\\SomePath\\Application.evtx", 
    EventExportLogFlags.LogFilePath);

with the following P/Invoke definition:

[Flags]
private enum EventExportLogFlags
{
    ChannelPath = 1,
    LogFilePath = 2,
    TolerateQueryErrors = 0x1000
};

[DllImport(@"wevtapi.dll", 
    CallingConvention = CallingConvention.Winapi,
    CharSet = CharSet.Auto,
    SetLastError = true)]
private static extern bool EvtExportLog(
    IntPtr sessionHandle,
    string path,
    string query,
    string targetPath,
    [MarshalAs(UnmanagedType.I4)] EventExportLogFlags flags);

Unfortunately the function returns false and a last error code of 2 (ERROR_FILE_NOT_FOUND).

My question:

What to put in the Path and Query parameters to export the local Application and System event log?

Uwe Keim · Accepted Answer · 2015-05-27 10:04:13Z

5

To answer my own question:

My Path and Query was actually correct. What was wrong, was the Flags parameter.

Instead of specifying the EventExportLogFlags.LogFilePath parameter, I had to specify the EventExportLogFlags.ChannelPath parameter.

Then the export succeeds:

EvtExportLog(
    IntPtr.Zero, 
    "Application", 
    "*", 
    "C:\\SomePath\\Application.evtx", 
    EventExportLogFlags.ChannelPath); // <-- HERE!

answered May 27, 2015 at 10:04

Uwe Keim

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