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keyboard event

Posted on 1999-01-21
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Last Modified: 2010-04-02
How do i detect a key? eg arrow key from keyboard???
i can use wm_keydown but then how do i detect which key?
thanks.
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Question by:at75
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Accepted Solution

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_Scotch_ earned 10 total points
ID: 1184802
Its the wParam that is passed to your handler.  All keys have
their own symbols, VK_RIGHT or VK_LEFT or VK_F17 for example,
that are defined in WINUSER.H
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Author Comment

by:at75
ID: 1184803
Scotch:thanks.i tried that too.but don't seems to work.
the error is :'wParam' : undeclared identifier
this is my code:
void CDhView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags)
{

switch(wParam)
      case VK_RIGHT:
            alpha += 3.0f;
                        if (alpha >= 360.0f)
                alpha=0.0f;
        break;
}

any idea what's goes wrong?
thanks
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Expert Comment

by:_Scotch_
ID: 1184804
When you said "wm_keydown" is misled myself into thinking
that you were in a win32 style message loop.  You're not.  It
looks more like the classwizard generated handler in which case
you want to

switch (nChar)  {
    case VK_RIGHT:
        ...
    case VK_LEFT:
        ...
    case yada-yada-yada
        ...
    default:
        ...
    }

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