winform键盘事件问题

[s136735431]

这个是窗体测试代码，请问需要添加什么代码才能实现在窗体没有获得焦点的情况下可以获得键盘输入。比如窗体隐藏了，在没有焦点的情况下按下N键能使窗体显示出来


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.N)
{
this.Opacity = 0;
}
else if (e.KeyCode == Keys.Y)
{
this.Opacity = 1;
}
}

private void Form1_Load(object sender, EventArgs e)
{
this.KeyPreview = true;
}
}
}

[机器人]

高级点的系统消息拦截才行了。

[ZengHD]

RegisterHotKey啊

[卓才琣]

注册热键就行了 4楼说得很明白

[feng442624978]

路过...本来想来解决的. 不过已经有人抢先了.

[xuld]

键盘钩子

或在 Form 反应

[ZengHD]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Threading;
using System.Management;
using System.Runtime.InteropServices;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("user32.dll")]
        private static extern bool RegisterHotKey(IntPtr hWnd, int id, KeyModifiers fsModifiers, Keys vk);

        [DllImport("user32.dll")]
        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        private const int WM_HOTKEY = 0x0312;   

        [Flags()]
        private enum KeyModifiers
        {
            None = 0,
            Alt = 1,
            Control = 2,
            Shift = 4,
            Windows = 8
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            RegisterHotKey(this.Handle, 1001,KeyModifiers.Control, Keys.S);
            RegisterHotKey(this.Handle, 1002, KeyModifiers.Control, Keys.C);
        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_HOTKEY)
            {
                if (m.WParam.ToInt32() == 1001)
                {
                    MessageBox.Show("显示窗体");
                }
                else if (m.WParam.ToInt32() == 1002)
                {
                    MessageBox.Show("关闭窗体");
                }
                return;
            }

            base.WndProc(ref m);
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            UnregisterHotKey(this.Handle, 1001);
            UnregisterHotKey(this.Handle, 1002);
        }
    }
  
}

[jieon]

RegisterHotKey(this.Handle, 1001,KeyModifiers.Control, Keys.S);
我设置,KeyModifiers.Control没有反应？,KeyModifiers.None才行