Console.ReadKey仅在按下“普通”键时捕获输入,然后将修饰符(如果有)作为键信息的一部分附加.如何将单个修改键按下作为输入？
解决方法
在
this link中提供了一个解决方案.我对上述代码进行了一些编辑,以作为您问题的答案.
要运行此代码：
>创建控制台应用程序@H_301_9@>添加对System.Windows.Forms.dll程序集的引用@H_301_9@>粘贴此代码并进行测试.
码：
using System;
using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;
class Program
{
class InterceptKeys
{
// https://blogs.msdn.microsoft.com/toub/2006/05/03/low-level-keyboard-hook-in-c/
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static LowLevelKeyboardProc _proc = HookCallback;
private static IntPtr _hookID = IntPtr.Zero;
private static IntPtr SetHook(LowLevelKeyboardProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL,proc,GetModuleHandle(curModule.ModuleName),0);
}
}
private delegate IntPtr LowLevelKeyboardProc(int nCode,IntPtr wParam,IntPtr lParam);
private static IntPtr HookCallback(int nCode,IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int vkCode = Marshal.ReadInt32(lParam);
OnKeyDown?.Invoke(new KeyEventArgs((Keys)vkCode));
}
return CallNextHookEx(_hookID,nCode,wParam,lParam);
}
[DllImport("user32.dll",CharSet = CharSet.Auto,SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook,LowLevelKeyboardProc lpfn,IntPtr hMod,uint dwThreadId);
[DllImport("user32.dll",SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll",SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk,int nCode,IntPtr lParam);
[DllImport("kernel32.dll",SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
private static event OnKeyDownDelegate OnKeyDown = null;
public delegate void OnKeyDownDelegate(KeyEventArgs e);
public static void SetupHook(OnKeyDownDelegate OnKeyDown)
{
InterceptKeys.OnKeyDown = OnKeyDown;
System.Threading.Tasks.Task.Run(() =>
{
_hookID = SetHook(_proc);
Application.Run();
UnhookWindowsHookEx(_hookID);
});
}
public static void ReleaseHook()
{
Application.Exit();
}
}
static void KeyDown(KeyEventArgs e)
{
Console.WriteLine("Hook: "+ e.KeyCode);
}
static void Main()
{
InterceptKeys.SetupHook(KeyDown);
while (true)
{
ConsoleKey key = Console.ReadKey(true).Key;
Console.WriteLine("ReadKey: "+ key);
if (key == ConsoleKey.Escape)
break;
}
InterceptKeys.ReleaseHook();
}
}
