[英]How can I capture modifier (ctrl, alt, shift) key presses as a single key press in a C# console app?
Console.ReadKey will only capture input when a "normal" key is pressed, and then it attaches the modifiers (if any) as a part of the key info. 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。 How can I register a single modifier key press as an input?
如何将单个修改键按下作为输入?
One solution is offered in this link . 此链接提供了一种解决方案。 I do some edit on the mentioned code for as an answer to your question.
我对上述代码进行了一些编辑,以作为您问题的答案。
To run this code: 要运行此代码:
Console Application
Console Application
System.Windows.Forms.dll
assembly System.Windows.Forms.dll
程序集的引用 Code: 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 wParam, 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", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, 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();
}
}
Are you in a console application? 你在控制台应用程序中吗? This is WinForm code:
这是WinForm代码:
Copied from here . 从这里复制。 Try this:
试试这个:
private void YourControl_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Menu)
{
//YourCode
e.Handled = true;
}
}
private void YourControl_KeyUp(object sender, KeyEventArgs e)
{
if (e.KeyData == Keys.Menu)
{
//YourCode
e.Handled = true;
}
}
Perhaps there are also modifiers for Control and Shift? 也许还有Control和Shift的修饰符? If not, I'm afraid that you'll need to use a timer and repeatedly check the state, or perhaps a global keyboard hook could catch it.
如果没有,我担心你需要使用计时器并反复检查状态,或者全局键盘钩可能会捕获它。
Modifier keys do not raise standard KeyPress events. 修饰符键不会引发标准的KeyPress事件。
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