How to Create Customize event for SetWinEventHook()

Question

How to Create Customize event for SetWinEventHook()

Sachi 221

Hi

I am using
private static extern IntPtr SetWinEventHook(uint eventMin, uint eventMax, IntPtr hmodWinEventProc, WinEventDelegate lpfnWinEventProc, uint idProcess, uint idThread, uint dwFlags);

for hooking window in eventMin im passing EVENT_SYSTEM_MOVESIZEEND = 0x000B; and
eventMax im passing EVENT_SYSTEM_MINIMIZEEND = 0x0017;

So event getting hit for move resize and minimize but when i maximize not getting callback so i refered constant from [https://learn.microsoft.com/en-us/windows/win32/winauto/event-constants][1]

there is no filter for maximize
is it possible to create our customize event(filter) and pass to setWineventhook() so that i can get callback when i maximized window?

please suggest me

Regards
shweta h

Answer accepted by question author

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Your answer

Answer 1

Castorix31 91,506

You can use EVENT_MIN, EVENT_MAX
and in the WinEventProc, you can do something like :

 if (idObject == OBJID_WINDOW) 
 {
    if (eventConst == EVENT_OBJECT_LOCATIONCHANGE)
    {
       if (IsZoomed(hWnd))
           Console.Beep(1000, 10);
    }
 }

with

       [DllImport("User32.dll", SetLastError = true)]
        public static extern bool IsZoomed(IntPtr hWnd);

Sachi 221 Reputation points

2022-01-07T17:10:13.907+00:00

your code is working when i maximize im getting beep but when i restored back from maximize i means zoomed out im not getting i need to when restore also.

Answer 2

Sachi 221

Hi @Castorix31 Thank you for prompt reply

As u suggested i have used EVENT_MIN, EVENT_MAX but it triggering cursor moves also i want avoid this and when i move or resize or min/max a window i need single call back
please suggest me
below is my peace of code

Castorix31 91,506 Reputation points

2022-01-07T17:17:47.96+00:00

but it triggering cursor moves also i want avoid this

I don't understand what you mean by "triggering cursor moves"...
Sachi 221 Reputation points

2022-01-07T17:27:20.663+00:00

see i am using textbox to get count of event triger so when i move or resize my window the count should be 1 but its capturing cursor movement on window also its considering cursor move as a callback or event trigger
Sachi 221 Reputation points

2022-01-07T17:32:56.38+00:00

its nothing but mouse movement on a window is considering as event trigger
Castorix31 91,506 Reputation points

2022-01-07T17:52:41.573+00:00
You can put your counter inside IsZoomed :

if (IsZoomed(hWnd)) { count++ // code... }
Sachi 221 Reputation points

2022-01-07T18:06:56.05+00:00

Hi problem is not with count++ it will give event trigger value but event should trigger only 1 time when we modify with window not all the time check below link once plz and suggest some approah

https://stackoverflow.com/questions/28195487/why-does-setwineventhook-with-event-object-locationchange-trigger-on-mouse-movem
Castorix31 91,506 Reputation points

2022-01-07T18:24:32.597+00:00

In my tests, while I'm inside if (idObject == OBJID_WINDOW)
the Beep() is not fired (only when I move the window with the mouse/caption, but not just by moving the mouse)
Sachi 221 Reputation points

2022-01-07T19:00:51.4+00:00

can i get that peace of project code please
Sachi 221 Reputation points

2022-01-07T19:32:50.42+00:00

You are passing a condition if(IsZoomed) so that Beep() fire when window zoomed my point is when we move or hover mouse on window that also getting consider as a fire when we use Event_Min Event_Max or EVENT_OBJECT_LOCATIONCHANGE this constant used for firing all the time I need the filter to fire a single event for for each move or resize or minimize/maximize the window so I am looking for constant which work like this
Castorix31 91,506 Reputation points

2022-01-07T19:47:08.517+00:00

But with the test if (idObject == OBJID_WINDOW), there is no event when the mouse is moved (which is OBJID_CURSOR)
Sachi 221 Reputation points

2022-01-10T04:19:48.927+00:00

yes Agree with this when if (idObject == OBJID_WINDOW), there is no event when the mouse is moved but when mouse clicked there is event firing i means when i click mouse button the event getting trigger. but i need event should fire when i moved/resize/min/max only not when mouse click all the time is there ant solution for this?
Castorix31 91,506 Reputation points

2022-01-10T07:55:41.02+00:00

I have no event when I just click the mouse if I test (idObject == OBJID_WINDOW) and (eventConst == EVENT_OBJECT_LOCATIONCHANGE)...
Sachi 221 Reputation points

2022-01-10T14:23:08.223+00:00

im using like this 8 is for maximize and 9 is for restoring
but when click on maximize button the event getting trigger twice can u try by using this code so u can get to know and please suggest me back for solution
Castorix31 91,506 Reputation points

2022-01-10T15:40:34.15+00:00

Events 8 and 9 are, from WinUser.h
EVENT_SYSTEM_CAPTURESTART = 0x0008
EVENT_SYSTEM_CAPTUREEND = 0x0009
then you get them when you click if you don't filter them...
Sachi 221 Reputation points

2022-01-10T16:12:01.437+00:00

then which filter i need to use for Maximize and Restore?
Castorix31 91,506 Reputation points

2022-01-10T16:25:21.177+00:00

There is no maximize or restore events (except with real hooks with SetWindowsHookEx, but a DLL is needed to get messages globally)
That's why you have to test the window state with APIs like IsZoomed, GetWindowPlacement, ...
Sachi 221 Reputation points

2022-01-10T16:45:26.357+00:00

thank you so much for clear understanding
how to use windowplacement instead of iszoomed?
Castorix31 91,506 Reputation points

2022-01-10T16:55:56.527+00:00

This is the test I did, but it does not work for Restore... => SetWinEventHook Test
Sachi 221 Reputation points

2022-01-10T17:27:22.247+00:00

isZoomed is for checking Maximize what API used for Restore?
Sachi 221 Reputation points

2022-01-10T18:14:47.54+00:00

Thank you so much for help
everything working fine except Restore from maximize
Sachi 221 Reputation points

2022-01-11T04:43:15.01+00:00

is there any other way we can check restore?
Castorix31 91,506 Reputation points

2022-01-11T08:30:38.307+00:00

Maybe by storing coordinates for each window in a list and comparing with last coordinates for a given window, if it was maximized just before being restored...
(otherwise WM SYSCOMMAND and SC_RESTORE with global hooks, but too complicated with a DLL just for this)
Sachi 221 Reputation points

2022-01-13T05:58:19.377+00:00

can u please send some sample so how to find maximize and Restore of window
it will be helpful as iam fresher to this i dont have much idea so.

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How to Create Customize event for SetWinEventHook()

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