C# Signature:

public delegate void DIFLOGCALLBACK(DIFXAPI_LOG EventType, Int32 ErrorCode, [MarshalAs(UnmanagedType.LPTStr)] string EventDescription, IntPtr CallbackContext);

VB Signature:

Public Delegate Sub DIFLOGCALLBACK(ByVal EventType As DIFXAPI_LOG, ByVal ErrorCode As Int32, <MarshalAs(UnmanagedType.LPTStr)> ByVal EventDescription As String, ByVal CallbackContext As IntPtr)

User-Defined Types:

DIFXAPI_LOG

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

To use this function you just need difxapi.dll of appropriate architecture from Windows Server 2008/Vista WDK. The DriverStore will be created automatically for you.

Sample Code:

C#:

public static void DIFLogCallbackFunc(DIFXAPI_LOG EventType, Int32 ErrorCode, string EventDescription, IntPtr CallbackContext)
{
      switch (EventType)
      {
      case DIFXAPI_LOG.DIFXAPI_SUCCESS:
      Console.WriteLine("SUCCESS: {0}. Error code: {1}", EventDescription, ErrorCode);
      break;
      case DIFXAPI_LOG.DIFXAPI_INFO:
      Console.WriteLine("INFO: {0}. Error code: {1}", EventDescription, ErrorCode);
      break;
      case DIFXAPI_LOG.DIFXAPI_WARNING:
      Console.WriteLine("WARNING: {0}. Error code: {1}", EventDescription, ErrorCode);
      break;
      case DIFXAPI_LOG.DIFXAPI_ERROR:
      Console.WriteLine("ERROR: {0}. Error code: {1}", EventDescription, ErrorCode);
      break;
      }
}

VB:

Public Sub DIFLogCallbackFunc(ByVal EventType As DIFXAPI_LOG, ByVal ErrorCode As Int32, ByVal EventDescription As String, ByVal CallbackContext As IntPtr)
      Select Case EventType
      Case DIFXAPI_LOG.DIFXAPI_SUCCESS
      Console.WriteLine("SUCCESS: {0}. Error code: {1}", EventDescription, ErrorCode)
      Exit Sub
      Case DIFXAPI_LOG.DIFXAPI_INFO
      Console.WriteLine("INFO: {0}. Error code: {1}", EventDescription, ErrorCode)
      Exit Sub
      Case DIFXAPI_LOG.DIFXAPI_WARNING
      Console.WriteLine("WARNING: {0}. Error code: {1}", EventDescription, ErrorCode)
      Exit Sub
      Case DIFXAPI_LOG.DIFXAPI_ERROR
      Console.WriteLine("ERROR: {0}. Error code: {1}", EventDescription, ErrorCode)
      Exit Sub
   End Select
End Sub