Example of using SetWinEventHook?

[skint007]

I can't seem to get SetWinEventHook to work, it never triggers the delegate. After I create the hook, the handle that is returned says it's "IsValid".

Heres how I setup the hook

private const int WINEVENT_OUTOFCONTEXT = 0x0000;
private const int EVENT_SYSTEM_FOREGROUND = 0x0003;
_hForegroundHook = PInvoke.SetWinEventHook(EVENT_SYSTEM_FOREGROUND, EVENT_SYSTEM_FOREGROUND, null, WinEventProc, 0, 0, WINEVENT_OUTOFCONTEXT);

This is the method I'm expecting to be triggered

private void WinEventProc(HWINEVENTHOOK hWinEventHook, uint eventType, HWND hwnd, int idObject, int idChild, uint dwEventThread, uint dwmsEventTime)
{
    // Some code
}

I'm sure I'm missing something but I'm not sure what.

Any hints are appreciated :)

[AArnott]

WinEventProc as you've defined it is an instance method. But native function pointers don't include a this pointer like C# Delegates do. It'll have to be static.
Then there's the fact that you'll need to pin the delegate so that the GC doesn't move it in memory while native code has a pointer to it.

[skint007]

Thank you, I must have missed those points when looking up examples, I will make those changes 😊