Check if other app has focus .

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.NET3.5

I use SendKeys api to send keystokes to some other app. I want to stop this when app loses focus . Is there posibility to check if other app has focus or even better to make app can't lose focus ? Thanks in advance.

Posted 5-Mar-11 5:39am

apaka

Updated 5-Mar-11 7:08am

v3

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Sandeep Mewara 5-Mar-11 12:46pm

even better to make app can't lose focus
Avoid it, users would get furious if you do it

2 solutions

Solution 1

To make a window focus use the windows api function setForgroundWindow.

MSDN decumentation about it here.

http://msdn.microsoft.com/en-us/library/ms633539%28v=vs.85%29.aspx[^]

Posted 5-Mar-11 7:01am

Albin Abel

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Sergey Alexandrovich Kryukov 5-Mar-11 19:04pm

Unfortunately, this will not solve the problem (and you did not ask how to find out if a form is "focused" (in fact, activated, but this does not matter). More importantly, it won't solve the problem: it is a bit more complex. Please see my Answer.
The real problem is this: as you click on Virtual Keyboard, target Window's focus is lost.
Sorry, only 4 this time.
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-03-05T13:00:00

For forms, a Form's "focus" is actually it's activation; you can use Form.Activate. If this is some Windows which is not a form, you can use the Answer by Albin. To know if a Window is in foreground you should use Windows API GetForegroundWindow which returns HWND and compare with HWND of the Window in question. You need to use P/Invoke as well as for SetForegroundWindow.

This along will not solve your problem. For full resolution, please see these two Answers:

Application focus getting and losing[^]
Programming on BACKSPACE button[^]

—SA