你可以获得全球MouseWheel
带有键盘挂钩。
using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Microsoft.Win32.SafeHandles;
using BOOL = System.Boolean;
using DWORD = System.UInt32;
using HHOOK = SafeHookHandle;
using HINSTANCE = System.IntPtr;
using HOOKPROC = HookProc;
using LPARAM = System.IntPtr;
using LRESULT = System.IntPtr;
using POINT = System.Drawing.Point;
using ULONG_PTR = System.IntPtr;
using WPARAM = System.IntPtr;
public delegate LRESULT HookProc(int nCode, WPARAM wParam, LPARAM lParam);
internal static class NativeMethods
{
[DllImport("User32.dll", SetLastError = true)]
internal static extern HHOOK SetWindowsHookEx(
HookType idHook,
HOOKPROC lpfn,
HINSTANCE hMod,
DWORD dwThreadId);
[DllImport("User32.dll")]
internal static extern LRESULT CallNextHookEx(
HHOOK hhk,
int nCode,
WPARAM wParam,
LPARAM lParam);
[DllImport("User32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern BOOL UnhookWindowsHookEx(
IntPtr hhk);
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr GetModuleHandle(string lpModuleName);
}
internal static class NativeTypes
{
internal enum MSLLHOOKSTRUCTFlags : uint
{
LLMHF_INJECTED = 0x00000001U,
}
[StructLayout(LayoutKind.Sequential)]
internal struct MSLLHOOKSTRUCT
{
internal POINT pt;
internal DWORD mouseData;
internal MSLLHOOKSTRUCTFlags flags;
internal DWORD time;
internal ULONG_PTR dwExtraInfo;
}
}
internal static class NativeConstants
{
internal const int WH_MOUSE_LL = 14;
internal const int HC_ACTION = 0;
internal const int WM_MOUSEWHEEL = 0x020A;
internal const int WM_MOUSEHWHEEL = 0x020E;
internal const int WHEEL_DELTA = 120;
}
public enum HookType
{
LowLevelMouseHook = NativeConstants.WH_MOUSE_LL
}
public enum HookScope
{
LowLevelGlobal,
}
public class SafeHookHandle : SafeHandleZeroOrMinusOneIsInvalid
{
private SafeHookHandle() : base(true) { }
public static SafeHookHandle SetWindowsHook(HookType idHook, HookProc lpfn, IntPtr hMod, uint dwThreadId)
{
var hhk = NativeMethods.SetWindowsHookEx(idHook, lpfn, hMod, dwThreadId);
if(hhk.IsInvalid)
{
throw new Win32Exception();
}
else
{
return hhk;
}
}
public IntPtr CallNextHook(int nCode, IntPtr wParam, IntPtr lParam)
{
return NativeMethods.CallNextHookEx(this, nCode, wParam, lParam);
}
protected override bool ReleaseHandle()
{
return NativeMethods.UnhookWindowsHookEx(this.handle);
}
}
public abstract class WindowsHook : IDisposable
{
private SafeHookHandle hhk;
private HookProc lpfn;
protected WindowsHook(HookType idHook, HookScope scope)
{
this.lpfn = this.OnWindowsHook;
switch(scope)
{
case HookScope.LowLevelGlobal:
IntPtr moduleHandle = NativeMethods.GetModuleHandle(null);
this.hhk = SafeHookHandle.SetWindowsHook(idHook, this.lpfn, moduleHandle, 0U);
return;
default:
throw new InvalidEnumArgumentException("scope", (int)scope, typeof(HookScope));
}
}
protected virtual IntPtr OnWindowsHook(int nCode, IntPtr wParam, IntPtr lParam)
{
return this.hhk.CallNextHook(nCode, wParam, lParam);
}
public void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if(disposing)
{
if(this.hhk != null) { this.hhk.Dispose(); }
}
}
}
public class LowLevelMouseHook : WindowsHook
{
public event MouseEventHandler MouseWheel;
public LowLevelMouseHook() : base(HookType.LowLevelMouseHook, HookScope.LowLevelGlobal) { }
protected sealed override IntPtr OnWindowsHook(int nCode, IntPtr wParam, IntPtr lParam)
{
if(nCode == NativeConstants.HC_ACTION)
{
var msLLHookStruct = (NativeTypes.MSLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(NativeTypes.MSLLHOOKSTRUCT));
switch(wParam.ToInt32())
{
case NativeConstants.WM_MOUSEWHEEL:
case NativeConstants.WM_MOUSEHWHEEL:
this.OnMouseWheel(new MouseEventArgs(Control.MouseButtons, 0, msLLHookStruct.pt.X, msLLHookStruct.pt.Y, (int)msLLHookStruct.mouseData >> 16));
break;
}
}
return base.OnWindowsHook(nCode, wParam, lParam);
}
protected virtual void OnMouseWheel(MouseEventArgs e)
{
if(this.MouseWheel != null)
{
this.MouseWheel(this, e);
}
}
}
用法示例:
using (LowLevelMouseHook hook = new LowLevelMouseHook())
{
hook.MouseWheel += (sender, e) =>
{
Console.WriteLine(e.Delta);
};
Application.Run();
}
代码提供了一个类LowLevelMouseHook
有一个事件MouseWheel
其行为类似于内置 Windows 窗体控件类中的事件。
(此外,代码被分成一个抽象类WindowsHooks
与其他钩子一起使用,SafeHookHandle
确保句柄被释放的类以及本机方法的帮助器类)
你应该看看SetWindowsHookEx and CALLBACK LowLevelMouseProc了解其背后的技术。
此事件不仅限于您的应用程序,还会捕获表单外部的鼠标,因此它也应该适用于您无法使用本地事件的操作。