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Win32API- GetForegroundWindows

Diego Guti

12/26/2008 9:07:00 PM

Hi!

I'm playing with the API of Windows, but I haven't found much
information about that (almost all is for VB -.- )

So I'd like to know where can I search for it.
Im trying to get de windows where the user is working, i have:

a = Win32API.new('user32', 'GetForegroundWindow', [], 'P')
a.Call()

But it doesnt work... The GetForegroundWindow function doesnt need
params and it returns a handle of the windows, so i think it should
run...

Thanks.

P.S.: Sorry, English is not my first language :)
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4 Answers

David Mullet

12/26/2008 11:36:00 PM

0

Diego Guti wrote:
> Hi!
>
> I'm playing with the API of Windows, but I haven't found much
> information about that (almost all is for VB -.- )
>
> So I'd like to know where can I search for it.
> Im trying to get de windows where the user is working, i have:
>
> a = Win32API.new('user32', 'GetForegroundWindow', [], 'P')
> a.Call()
>
> But it doesnt work... The GetForegroundWindow function doesnt need
> params and it returns a handle of the windows, so i think it should
> run...
>
> Thanks.
>
> P.S.: Sorry, English is not my first language :)

Try changing your last parameter from 'P' to 'N':

a = Win32API.new('user32', 'GetForegroundWindow', [], 'N')
window = a.Call()

David
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Diego Guti

12/27/2008 10:10:00 AM

0

> Try changing your last parameter from 'P' to 'N':
>
> a = Win32API.new('user32', 'GetForegroundWindow', [], 'N')
> window = a.Call()
>
> David

Thanks, now it's running :).

Just one more question. Now i got the handle of the window, any chance
to get the name of the window??
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David Mullet

12/27/2008 5:38:00 PM

0

Diego Guti wrote:
>> Try changing your last parameter from 'P' to 'N':
>>
>> a = Win32API.new('user32', 'GetForegroundWindow', [], 'N')
>> window = a.Call()
>>
>> David
>
> Thanks, now it's running :).
>
> Just one more question. Now i got the handle of the window, any chance
> to get the name of the window??

You can use the GetWindowText API call. Pass it (1) your window handle,
(2) a string buffer into which the text is to be copied, and (3) the
maximum number of characters to copy to the buffer:

require 'Win32API'

getForegroundWindow = Win32API.new('user32', 'GetForegroundWindow', [],
'L')
getWindowText = Win32API.new('user32', 'GetWindowText', ['L', 'P', 'I'],
'I')

window_handle = getForegroundWindow.Call()
title_buffer = ' ' * 256
getWindowText.Call(window_handle, title_buffer, 256)
puts(title_buffer)

David
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Diego Guti

12/27/2008 6:09:00 PM

0


> You can use the GetWindowText API call. Pass it (1) your window handle,
> (2) a string buffer into which the text is to be copied, and (3) the
> maximum number of characters to copy to the buffer:
>
> require 'Win32API'
>
> getForegroundWindow = Win32API.new('user32', 'GetForegroundWindow', [],
> 'L')
> getWindowText = Win32API.new('user32', 'GetWindowText', ['L', 'P', 'I'],
> 'I')
>
> window_handle = getForegroundWindow.Call()
> title_buffer = ' ' * 256
> getWindowText.Call(window_handle, title_buffer, 256)
> puts(title_buffer)
>
> David


Ok. Thank you very much !! Now It's perfect.

Regards
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