Wednesday, March 23, 2011

Creating Win32 events from c#

I'd like create a kernel(aka named events) from C#.

Do I have to interop services and wrap the native CreateEvent function or is there already a .NET class that does the job?

The function that I need to run should be something like this: hEvent = CreateEvent ( NULL , false , false , "MyCSHARPEvent" );

This should notify all procs that probing forMyCSHARPEvent about the event.

If there is a need to wrap the function, how would I translate the SECURITY_ATTRIBUTES struct from C# to win32?

From stackoverflow
  • Take a look at the EventWaitHandle class. It's supported from .Net 2.0 onwards and allows creation of named events. It also supports setting event security, depending on which constructor you use.

  • If you still want to use interop, you can define the function like this:

    [DllImport("kernel32.dll")]
    static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, string lpName);
    

    and the struct like this(you may have to mess with the Pack attribute to make it fit):

    [StructLayout(LayoutKind.Sequential)]
    struct SECURITY_ATTRIBUTES{
      public int length;
      public IntPtr securityDesc;
      public bool inherit;
    }
    

    Also, here's a code example of putting it all together.

    ctacke : But why would you?
    JoshBerke : if your supporting .net 1.1
    ctacke : Wow - I thought only the CF was that crippled (it still doesn't support named EventWaitHandles).
    Sam : CF 3.5 now does support EventWaitHandles.

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