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375047
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0
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2008-12-17T16:04:36.590
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2008-12-17T16:04:36.590
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47104
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370754
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11
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<p>The trick is to use a set of user32.dll functions: <a href="http://msdn.microsoft.com/en-us/library/ms633522(VS.85).aspx" rel="noreferrer">GetWindowThreadProcessId</a>, <a href="http://msdn.microsoft.com/en-us/library/ms646296.aspx" rel="noreferrer">GetKeyboardLayout</a>, <a href="http://msdn.microsoft.com/en-us/library/ms646299(VS.85).aspx" rel="noreferrer">GetKeyboardState</a> and <a href="http://msdn.microsoft.com/en-us/library/ms646322(VS.85).aspx" rel="noreferrer">ToUnicodeEx</a>.</p> <ol> <li>Use the <a href="http://msdn.microsoft.com/en-us/library/ms633522(VS.85).aspx" rel="noreferrer">GetWindowThreadProcessId</a> function with your control handle to achieve the relevant native thread id.</li> <li>Pass that thread id to <a href="http://msdn.microsoft.com/en-us/library/ms646296.aspx" rel="noreferrer">GetKeyboardLayout</a> to get the current keyboard layout.</li> <li>Call <a href="http://msdn.microsoft.com/en-us/library/ms646299(VS.85).aspx" rel="noreferrer">GetKeyboardState</a> to get the current keyboard state. This helps the next method to decide which character to generate according to modifiers state.</li> <li>Finally, call the <a href="http://msdn.microsoft.com/en-us/library/ms646322(VS.85).aspx" rel="noreferrer">ToUnicodeEx</a> function with the wanted virtual key code and scan code (those two can be the same), the current keyboard state, a string builder as a string holder (to hold the result), no flags (0), and the current keyboard layout pointer.</li> </ol> <p>If the result is not zero, just return the first returned character.</p> <pre><code> public class KeyboardHelper { [DllImport("user32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)] private static extern int ToUnicodeEx( uint wVirtKey, uint wScanCode, Keys[] lpKeyState, StringBuilder pwszBuff, int cchBuff, uint wFlags, IntPtr dwhkl); [DllImport("user32.dll", ExactSpelling = true)] internal static extern IntPtr GetKeyboardLayout(uint threadId); [DllImport("user32.dll", ExactSpelling = true)] internal static extern bool GetKeyboardState(Keys[] keyStates); [DllImport("user32.dll", ExactSpelling = true)] internal static extern uint GetWindowThreadProcessId(IntPtr hwindow, out uint processId); public static string CodeToString(int scanCode) { uint procId; uint thread = GetWindowThreadProcessId(Process.GetCurrentProcess().MainWindowHandle, out procId); IntPtr hkl = GetKeyboardLayout(thread); if (hkl == IntPtr.Zero) { Console.WriteLine("Sorry, that keyboard does not seem to be valid."); return string.Empty; } Keys[] keyStates = new Keys[256]; if (!GetKeyboardState(keyStates)) return string.Empty; StringBuilder sb = new StringBuilder(10); int rc = ToUnicodeEx((uint)scanCode, (uint)scanCode, keyStates, sb, sb.Capacity, 0, hkl); return sb.ToString(); } } </code></pre>
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1. POconvert a keycode to the relevant display character
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1. USItai Bar-Haim
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1. POconvert a keycode to the relevant display character
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