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Editorial Team
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Asked: 2026-06-08T02:51:56+00:00

I need to check if caps lock is pressed, and found a function that

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I need to check if caps lock is pressed, and found a function that requires an int online.

[DllImport("user32.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
    public static extern short GetKeyState(int keyCode);
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1 Answer

  1. Editorial Team

    From googling, I found this one:

    void CheckKeyState()
{
   if ((GetKeyState(VK_CAPITAL) & 0x0001)!=0)
      AfxMessageBox("Caps Lock ON!");
   else
      AfxMessageBox("Caps Lock OFF!");
}

    With VK_CAPITAL being 0x14.

    So you could write in C#:

    public void CheckKeyState()
{
   if ((GetKeyState(0x14) & 0x0001)!=0)
      System.Windows.Forms.MessageBox.Show("Caps Lock ON!");
   else
      System.Windows.Forms.MessageBox.Show("Caps Lock OFF!");
}

    Of course, what Holger says makes a lot more sense than using the P/Invoke stuff.

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