Solved

detect flashwindow via hooks?

Posted on 2002-05-09
8
496 Views
Last Modified: 2013-12-03
I want to detect if and which window is flashing. Flashing as in using FlashWindow(TRUE). Using system wide hooks or what ever.
I'm using VC++ (6)
0
Comment
Question by:KnoppenSpook
  • 4
  • 3
8 Comments
 

Author Comment

by:KnoppenSpook
ID: 6999885
If it's worth more point you'll get them
0
 
LVL 4

Accepted Solution

by:
mblat earned 200 total points
ID: 7000092
So what exactly do you need to know?  How to install system wide hook?
There is an artile on MSDN about it, called Win 32 Hooks.
Function call you need to look for SetWindowsHookEx.

All you need to do is:
1. Install windows hook.
2. Detect WM_NCACTIVATE message. ( That's what FlashWindow does - it sends WM_NCACTIVATE )
3. Then see if they go to the same window with the same interval.  That's the window that is flashing.  

Of cause it will take several falshes to detect it. And by the way - interval doesn;t have to be the same come to think about it.  It probably will, but doesn't have to.


Hope it helps a little.  
0
 
LVL 4

Expert Comment

by:mblat
ID: 7000097
So what exactly do you need to know?  How to install system wide hook?
There is an artile on MSDN about it, called Win 32 Hooks.
Function call you need to look for SetWindowsHookEx.

All you need to do is:
1. Install windows hook.
2. Detect WM_NCACTIVATE message. ( That's what FlashWindow does - it sends WM_NCACTIVATE )
3. Then see if they go to the same window with the same interval.  That's the window that is flashing.  

Of cause it will take several falshes to detect it. And by the way - interval doesn;t have to be the same come to think about it.  It probably will, but doesn't have to.


Hope it helps a little.  
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 

Author Comment

by:KnoppenSpook
ID: 7000694
Well, I just have to know how to detect the flashing. I know how to work with hooks (sort of). Is WM_NCACTIVATE only created by FlashWindow()? Or also from other actions.

Thanks for your reply!

0
 

Author Comment

by:KnoppenSpook
ID: 7000758
thanks for your reply.
I'll work with this and let you knwo the results.
0
 

Author Comment

by:KnoppenSpook
ID: 7001357
hmm experts-exchange is very weird, you can't see your reply and then you see it twice :-)
0
 
LVL 4

Expert Comment

by:mblat
ID: 7002016
Some other events in your system can generate WM_NCACTIVATE.  
User selecting window via mouse click or ALT-TAB is some of them....
I guess you will have to recognize it somehow....


Good luck...
0

Featured Post

Instantly Create Instructional Tutorials

Contextual Guidance at the moment of need helps your employees adopt to new software or processes instantly. Boost knowledge retention and employee engagement step-by-step with one easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article shows how to make a Windows 7 gadget that accepts files dropped from the Windows Explorer.  It also illustrates how to give your gadget a non-rectangular shape and how to add some nifty visual effects to text displayed in a your gadget.…
For most people, the WrapPanel seems like a magic when they switch from WinForms to WPF. Most of us will think that the code that is used to write a control like that would be difficult. However, most of the work is done by the WPF engine, and the W…
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question