coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for GetKeyState in other DLLs exists, click on Find References to the right.

Summary

The GetKeyState function retrieves the status of the specified virtual key. The status specifies whether the key is up, down, or toggled (on, off—alternating each time the key is pressed).

C# Signature:

[DllImport("coredll.dll", SetLastError=true)]

public static extern short GetKeyState(VK nVirtKey);

VB Signature:

Declare Function GetKeyState Lib "coredll.dll" (ByVal nVirtKey As [VK]) As Short

User-Defined Types:

Alternative Managed API:

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Notes:

This function is very similar to the user32 function of the same name

Tips & Tricks:

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Sample Code:

This sample VB.net code will check whether the NumLock is on or off.

   Const VK_NUMLOCK As Integer = CInt(System.Windows.Forms.Keys.NumLock)
   Dim keystate As Short = GetKeyState(VK_NUMLOCK)
   If (keystate = 0) Then
      MsgBox("NumLock is off")
   Else
      MsgBox("NumLock is on")
   End If

Documentation

GetKeyState on MSDN

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