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This is the first revision of my changes

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This commit is contained in:
Troy Cook
2020-09-21 01:46:45 -05:00
parent 4deea28edd
commit c3afb5cb43
10 changed files with 231 additions and 75 deletions
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98
KVMControlHook.cs Normal file
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using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace MeshCentralRouter
{
public class KVMControlHook
{
public delegate void KVMCallback(byte keyCodes, byte lParam);
private KVMCallback _callback;
private KVMKeyboardHook.LowLevelKeyboardProc _proc;
private static IntPtr _hook = IntPtr.Zero;
protected static KVMControl _control;
internal KVMControlHook()
{
_proc = HookCallback;
AttachKeyboardHook();
}
private void AttachKeyboardHook()
{
try
{
_hook = KVMKeyboardHook.SetHook(_proc);
}
catch
{
DetachKeyboardHook();
throw new System.InvalidOperationException("Could not set hook.");
}
}
internal void AttachCallback(KVMCallback callback)
{
_callback = callback;
}
internal void DetachCallback()
{
_callback = null;
}
internal static void DetachKeyboardHook()
{
if (_hook != IntPtr.Zero)
KVMKeyboardHook.UnhookWindowsHookEx(_hook);
}
public IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0)
{
bool alt = (Control.ModifierKeys & Keys.Alt) != 0;
bool control = (Control.ModifierKeys & Keys.Control) != 0;
Keys key = (Keys)Marshal.ReadInt32(lParam);
const int WM_KEYDOWN = 0x100;
const int WM_KEYUP = 0x101;
const int WM_SYSKEYDOWN = 0x104;
const int WM_SYSKEYUP = 0x105;
byte bkey = (byte)key;
byte keyStatus;
switch ((int)wParam)
{
case WM_KEYDOWN:
keyStatus = 0;
break;
case WM_KEYUP:
keyStatus = 1;
break;
case WM_SYSKEYDOWN:
keyStatus = 4;
break;
case WM_SYSKEYUP:
keyStatus = 5;
break;
default:
return KVMKeyboardHook.CallNextHookEx(_hook, nCode, wParam, lParam);
}
try
{
if (_callback != null)
{
_callback(bkey,keyStatus);
return (IntPtr)1;
}
}
catch { }
}
return KVMKeyboardHook.CallNextHookEx(_hook, nCode, wParam, lParam);
}
}
}