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Summary

The GetKeyboardState API

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static extern bool GetKeyboardState(byte [] lpKeyState);

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    Private Shared Function GetKeyboardState(ByVal keyState() As Byte) As Boolean

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Private Declare Function GetKeyboardState Lib "user32" (ByVal keyState() As Byte) As Boolean

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In some cases this function will always return the same array, independent of actual keyboard state. This is due to Windows not updating the virtual key array internally. It has been found that declaring and calling GetKeyState on any key before calling GetKeyboardState will solve this issue.

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            if(!NativeMethods.GetKeyboardState(keys)){

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        internal static extern bool GetKeyboardState(byte[] lpKeyState);

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    Private Shared Function GetKeyboardState(ByVal keyState() As Byte) As Boolean

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    Dim result As Boolean = GetKeyboardState(keyState)

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        Debug.WriteLine("GetKeyBoardState error: " & Marshal.GetLastWin32Error)

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        Throw New Exception("GetKeyBoardState error: " & Marshal.GetLastWin32Error)

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Documentation

[GetKeyboardState] on MSDN

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    Private Declare Function GetKeyboardState Lib "user32" (ByRef pbKeyState As Byte) As Integer

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    GetKeyboardState(keys(0))

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    GetKeyboardState(keys(0))

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    static extern bool GetKeyboardState(byte [] lpKeyState);

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    bool bKeyStateStatus = GetKeyboardState(bKeyState);

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    static extern bool GetKeyboardState(byte [] lpKeyState);

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    bool bKeyStateStatus = GetKeyboardState(bKeyState);