WinAPI WM_KEYDOWN how to detect Alt of left

**lordzero** · 03-04-2008, 11:08 PM

Hello

I'm using WinAPI...

Code:

wm_keydown&#58;
begin


    if &#40;GetKeyState&#40;&#40;VK_MENU&#41;&#41; <> 0&#41; and &#40;wParam = VK_RETURN&#41; then
    begin      
   //code here
    end;

how to detect the alt of left?

i tried VK_LMENU but dont get sucess...

suggestions?

Greetings

**JernejL** · 04-04-2008, 06:49 PM

on wm_keydown call GetKeyboardState and figure out which key was pressed / depressed from that structure.

**noeska** · 04-04-2008, 07:06 PM

http://www.delphifaq.com/faq/delphi_...API/f359.shtml

VK_MENU should be the alt. Also available in L and R version.

**Mirage** · 04-04-2008, 08:35 PM

You may check the value of lParam. Especially the following bits:
16-23 - Specifies the scan code. The value depends on the original equipment manufacturer (OEM).
24 - Specifies whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.

**lordzero** · 05-04-2008, 04:37 AM

I've changed to this:

If (GetAsyncKeyState ((VK_SHIFT)) <> 0) and (Key = VK_RETURN) then

and is working...

the problem is not with VK_LMENU...

the problem is when i press Alt of Left on my windowed window.. it set focus to windows properties... such as a submenu..

how to disable this "option" on a Window with pure WinAPI?

doing this i will get the desired result..

suggestions?

**JernejL** · 05-04-2008, 10:10 AM

So, why are you all ignoring the GetKeyboardState solution? that thing gives you a nice byte array, 1 byte for each key, which you can even use to detect multimedia keys as they are all separate in the structure.

**lordzero** · 05-04-2008, 04:45 PM

Originally Posted by Delfi

So, why are you all ignoring the GetKeyboardState solution? that thing gives you a nice byte array, 1 byte for each key, which you can even use to detect multimedia keys as they are all separate in the structure.

can you show some sample? actually this is not much clear... :?

**JernejL** · 05-04-2008, 05:20 PM

Originally Posted by lordzero

Originally Posted by Delfi

So, why are you all ignoring the GetKeyboardState solution? that thing gives you a nice byte array, 1 byte for each key, which you can even use to detect multimedia keys as they are all separate in the structure.

can you show some sample? actually this is not much clear... :?

http://msdn2.microsoft.com/en-us/library/ms646299(VS.85).aspx

what you do, is fetch the array, and then check the array entry of say
VK_LCONTROL or VK_RCONTROL number to see if key is pressed or not.