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GetKeyState (user32)
.
C# Signature:
[DllImport("user32.dll")]
static extern short GetKeyState(int nVirtKey);
VB Signature:
<DllImport("user32.dll")> _
Public Function GetKeyState(ByVal nVirtKey As Integer) As Integer
End Function
User-Defined Types:
None.
Notes:
Here are some sample values for nVirtKey:
const int VK_SHIFT = 0x10; // Use Keys.ShiftKey
const int VK_CONTROL = 0x11; // Use Keys.ControlKey
const int VK_MENU = 0x12; // Use Keys.Menu
Tips & Tricks:
'Use the System.Windows.Forms.Keys enumeration instead of VK codes,
'but make sure you use the right one! (Keys.ShiftKey not Keys.Shift, etc.)
Sample VB Code:
Imports System.Windows.Forms
Public Function IsKeyDown(ByVal keys As Keys) As Boolean
Return (GetKeyState(CInt(keys)) And &H8000) = &H8000
End Function
Public Function IsKeyOn(ByVal keys As Keys) As Boolean
Return (GetKeyState(CInt(keys)) And &H1) = &H1
End Function
Sample C# Code:
using System.Windows.Forms;
public static bool IsKeyLocked(Keys keyVal) {
switch( keyVal ) {
case Keys.NumLock :
case Keys.Capital :
case Keys.Scroll :
case Keys.Insert :
return (GetKeyState((int)keyVal) & 0x8001) != 0;
}
return false;
}
/// <summary>
/// This method tests whether a key is down or not.
/// </summary>
/// <param name="k">The key to test.</param>
/// <returns>True if the keys is down.</returns>
public static bool IsKeyDown(System.Windows.Forms.Keys k)
{
short state = GetKeyState((int)k);
if((state & 0x8000) == 0x8000) //It's down
return true;
return false;
}
/// <summary>
/// This method tests whether a key is on or not.
/// </summary>
/// <param name="k">The key to test.</param>
/// <returns>True if the keys is on.</returns>
public static bool IsKeyOn(System.Windows.Forms.Keys k)
{
short state = GetKeyState((int)k);
if((state & 0x0001) == 0x0001) //It's on
return true;
return false;
}
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