某些应用,我们希望全局自定义热键。按键少了会和别的应用程序冲突,按键多了可定用户操作不变。因此我计划左手用Ctrl+Alt,右手用鼠标右键呼出我自定义的菜单。
我使用键盘和鼠标事件进行简单测试(Ctrl+鼠标右键),发现并不能成功。
RegisterHotKey(hWnd, HOTKEY_ID, (int)Modifiers.Control, (int)Keys.RButton);
因此只好使用“钩子”。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
private const int WH_MOUSE_LL = 14;
private const int WM_RBUTTONDOWN = 0x0204;
private const int VK_CONTROL = 0x11;
private const int VK_MENU = 0x12;
private HookProc mouseProc;
private IntPtr hookId = IntPtr.Zero;
public event EventHandler HotkeyPressed;
private IntPtr SetMouseHook(HookProc proc)
{
using (Process curProcess = Process.GetCurrentProcess())
using (ProcessModule curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_MOUSE_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
private IntPtr MouseHookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_RBUTTONDOWN)
{
int ctrl_keyState = GetAsyncKeyState(VK_CONTROL);
int alt_keyState = GetAsyncKeyState(VK_MENU);
// 检查Ctrl键和Alt键是否同时按下
if ((ctrl_keyState < 0) & (alt_keyState < 0))
{
HotkeyPressed?.Invoke(this, EventArgs.Empty);
// 返回非零值以阻止事件传递给其他窗口
return new IntPtr(1);
}
}
return CallNextHookEx(hookId, nCode, wParam, lParam);
}
private delegate IntPtr HookProc(int code, IntPtr wParam, IntPtr lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, HookProc 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);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern short GetAsyncKeyState(int vKey);
private void HotkeyExample_HotkeyPressed(object sender, EventArgs e)
{
Console.WriteLine("Ctrl+Alt+鼠标右键被按下");
// 可以执行其他操作...
if (this.WindowState == FormWindowState.Minimized)
{
POINT M_Point = GetMousePosition();
this.WindowState = FormWindowState.Normal;
}
else
{
this.WindowState = FormWindowState.Minimized;
}
}
private void Form1_Load(object sender, EventArgs e)
{
this.HotkeyPressed += HotkeyExample_HotkeyPressed;
mouseProc = MouseHookCallback;
hookId = SetMouseHook(mouseProc);
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
UnhookWindowsHookEx(hookId);
}
通过以上代码,自定义窗体顺利弹出,而且并不会与别的程序冲突,满足了需求。