我试图让我的应用程序始终显示在桌面级别。这意味着我的应用程序需要忽略 LWin+D 或 RWin+D 等键序列。我试图让它以这种方式工作:
protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
if (prefixSeen)
{
if (keyData == Keys.D)
{
MessageBox.Show("Got it!");
}
prefixSeen = false;
return true;
}
if (keyData == Keys.LWin)
{
prefixSeen = true;
return true;
}
return base.ProcessCmdKey(ref msg, keyData);
}
但它只捕获 RWin/LWin 按钮,没有 D 按钮。
我也曾尝试创建自己的消息过滤器,但我迷失了方向。所有这些messages和按位:
public class KeystrokMessageFilter : System.Windows.Forms.IMessageFilter
{
public KeystrokMessageFilter() { }
public bool PreFilterMessage(ref Message m)
{
if ((m.Msg == 256 /*0x0100*/))
{
switch (((int)m.WParam) | ((int)Control.ModifierKeys))
{
case (int)(Keys.Control | Keys.Alt | Keys.K):
MessageBox.Show("You pressed ctrl + alt + k");
break;
case (int)(Keys.Control | Keys.C): MessageBox.Show("ctrl+c");
break;
case (int)(Keys.Control | Keys.V): MessageBox.Show("ctrl+v");
break;
case (int)Keys.Up: MessageBox.Show("You pressed up");
break;
}
}
return false;
}
}
Application.AddMessageFilter(keyStrokeMessageFilter);
那么,我该如何让我的应用程序捕捉/忽略 R/LWin+D?
最佳答案
此代码注册一个低级键盘 Hook ,并在按住 Windows 键时监听 D
按键。如果检测到这一点, Hook 会简单地忽略按键。否则,它会转发按键。
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace KbHook
{
public static class Program
{
const int HC_ACTION = 0;
const int WH_KEYBOARD_LL = 13;
const int WM_KEYDOWN = 0x0100;
static IntPtr HookHandle = IntPtr.Zero;
static Form1 Form1;
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr SetWindowsHookEx(int idHook, KbHook lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr GetModuleHandle(string lpModuleName);
[STAThread]
static void Main()
{
try
{
using (var proc = Process.GetCurrentProcess())
using (var curModule = proc.MainModule)
{
var moduleHandle = GetModuleHandle(curModule.ModuleName);
HookHandle = SetWindowsHookEx(WH_KEYBOARD_LL, IgnoreWin_D, moduleHandle, 0);
}
Form1 = new Form1();
Application.Run(Form1);
}
finally
{
UnhookWindowsHookEx(HookHandle);
}
}
[DllImport("user32.dll")]
static extern short GetAsyncKeyState(Keys vKey);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
static IntPtr IgnoreWin_D(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode == HC_ACTION
&& IsWin_D(wParam, lParam))
return (IntPtr) 1; //just ignore the key press
return CallNextHookEx(HookHandle, nCode, wParam, lParam);
}
static bool IsWin_D(IntPtr wParam, IntPtr lParam)
{
if ((int) wParam != WM_KEYDOWN)
return false;
var keyInfo = (KbHookParam) Marshal.PtrToStructure(lParam, typeof (KbHookParam));
if (keyInfo.VkCode != (int) Keys.D) return false;
return GetAsyncKeyState(Keys.LWin) < 0
|| GetAsyncKeyState(Keys.RWin) < 0;
}
delegate IntPtr KbHook(int nCode, IntPtr wParam, [In] IntPtr lParam);
[StructLayout(LayoutKind.Sequential)]
struct KbHookParam
{
public readonly int VkCode;
public readonly int ScanCode;
public readonly int Flags;
public readonly int Time;
public readonly IntPtr Extra;
}
}
}
关于c# - 在 Winforms 中捕获 WinKey+D 键序列,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31771464/