If you want to determine what character you will get from a given key with given modifiers, you should use the user32 ToAscii
function. Or ToAsciiEx
if you want to use a keyboard layout other then the current one.
using System.Runtime.InteropServices;
public static class User32Interop
{
public static char ToAscii(Keys key, Keys modifiers)
{
var outputBuilder = new StringBuilder(2);
int result = ToAscii((uint)key, 0, GetKeyState(modifiers),
outputBuilder, 0);
if (result == 1)
return outputBuilder[0];
else
throw new Exception("Invalid key");
}
private const byte HighBit = 0x80;
private static byte[] GetKeyState(Keys modifiers)
{
var keyState = new byte[256];
foreach (Keys key in Enum.GetValues(typeof(Keys)))
{
if ((modifiers & key) == key)
{
keyState[(int)key] = HighBit;
}
}
return keyState;
}
[DllImport("user32.dll")]
private static extern int ToAscii(uint uVirtKey, uint uScanCode,
byte[] lpKeyState,
[Out] StringBuilder lpChar,
uint uFlags);
}
You can now use it like this:
char c = User32Interop.ToAscii(Keys.D3, Keys.ShiftKey); // = '#'
If you need more than one modifier, just or
them. Keys.ShiftKey | Keys.AltKey