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7.3 How do I check the state of the virtual keys, Caps lock for example?
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If the Control.ModifierKeys doesn't address your issue, then use Platform Invoke and call GetKeyState directly.
Declare this class first:
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ComVisibleAttribute(false),
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SuppressUnmanagedCodeSecurityAttribute()
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internal class NativeMethods
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[DllImport("user32.dll", CharSet=CharSet.Auto, ExactSpelling=true, CallingConvention=CallingConvention.Winapi)]
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public static extern short GetKeyState(int keyCode);
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public static int HIWORD(int n)
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return ((n >> 16) & 0xffff/*=~0x0000*/);
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public static int LOWORD(int n)
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return (n & 0xffff/*=~0x0000*/);
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Then when you want to check if Caps is down or ON, call:
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short state = NativeMethods.GetKeyState(0x14 /*VK_CAPTIAL*/);
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bool capsKeyDown = NativeMethods.HIWORD(state);
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bool capsKeyON = NativeMethods.LOWORD(state);
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