Capturing Alt-X

[Scott Turchin]

I know I've seen hwo to do this but I want to capture ALT-X or ALT-Z or any alt key like that...

Can I just get a scancode or do I need to know the ALT key was pressed?

Right now I can get other keys:

I = WaitKey$
Select Case Asc(I)
       Case 13,121,89
End Select

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Scott Turchin
MCSE, MCP+I
Computer Creations Software
http://www.tngbbs.com/ccs

[Borje Hagsten]

Easiest is to use an accelerator table, but something like the
following can also be used:

     CASE %WM_SYSKEYDOWN
        IF wParam = ASC("X") AND _
           (GetKeyState(%VK_MENU) AND &H8000) <> 0 THEN BEEP

Note: Not sure it works in DDT dialogs - DDT is hungry and eats
lots of messages. In subclassed controls / "SDK-style" message
handlers it works fine though..


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[Clay Clear]

There's another API Call that may help:

L& = GetAsyncKeyState(%VK_MENU)

This'll return non-zero if the ALT key were presses since the
last call to the function.

Note that the MSB or LSB might be set, based on different
conditions - you'll have to read win32.hlp for the details.

It's been a while since I used this function, so read up on it
before using it, please.

The function will return zero if the ALT key was NOT pressed since
the last call to the function.

Regards,


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Clay C. Clear

mailto:[email protected][email protected]</A>

Clay Clear's Software

[Lance Edmonds]

Originally posted by Scott Turchin:
Right now I can get other keys:

I = WaitKey$
Select Case Asc(I)
       Case 13,121,89
End Select

Er... are you using PB/CC or PB/DLL here? WAITKEY$ is a PB/CC function.

For PB/CC, checkout the INSHIFT function.

For PB/DLL, you could use accelerators, GetAsyncKeyState, or even use a keyboard hook. The best choice will depend on what you want to achieve, and what kind of UI you are using. Search for "WH_KEYBOARD" for hook examples.




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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Eddy Van Esch]

When you use PB/DLL, you can also use a hotkey. This enables you to trap
a key combination independent of which program has focus.
Search the source code forum for "RegisterHotkey".
If you want I can mail you source code that uses a hotkey.
Kind regards
Eddy


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[email protected]

[Lance Edmonds]

"Alt+X" suggests closing an app... using a hotkey may not be the best choice since that would make it possible to close the app even when another app has the foreground (focus). Also, many app's use the Alt+X combination, and this would be intercepted by the hotkey, producing possibly "unexpected" results.


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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Eddy Van Esch]

Well Lance,
It is not exactly clear to me what Scott wants to do with this ALT-X..
Does he want to close his application or on the contrary, does he want to
prevent that his application is closed by intercepting the key combination..?
To close his application, he can simply use the old ALT-F4...
Eddy



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[email protected]

[Scott Turchin]

I goofed, it is PB/CC, my cable modem comes up for a few minutes at a time (They're working on it, it rains, cable goes out..)...

Anyway, yes, I want to exit a PB/CC app using ALT-X.



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Scott Turchin
MCSE, MCP+I
Computer Creations Software
http://www.tngbbs.com/ccs