怎样设置像QQ那样的热键

Question

想做一个像QQ那样的有消息时，按热键就把对话框弹出来的效果，哪位大哥指点一下怎么写热键效果呀？

Answer 1

你可以获取键盘事件，
if (e.KeyCode == Keys.Enter) { 
 this.WindowState = FormWindowState.Normal；
}

Answer 2

一楼的大哥，我的窗体是隐藏的，Form没有获得焦点，应该不能相应事件吧

Answer 3

C#系统热键类
using System;
using System.Runtime.InteropServices;namespace SystemHotKey
{
    public delegate void HotkeyEventHandler(int HotKeyID);    public class Hotkey : System.Windows.Forms.IMessageFilter
    {
        System.Collections.Hashtable keyIDs = new System.Collections.Hashtable();
        IntPtr hWnd;        public event HotkeyEventHandler OnHotkey;        public enum KeyFlags
        {
            MOD_ALT = 0x1,
            MOD_CONTROL = 0x2,
            MOD_SHIFT = 0x4,
            MOD_WIN = 0x8
        }
        [DllImport("user32.dll")]
        public static extern UInt32 RegisterHotKey( IntPtr hWnd, UInt32 id, UInt32 fsModifiers, UInt32 vk);        [DllImport("user32.dll")]
        public static extern UInt32 UnregisterHotKey( IntPtr hWnd, UInt32 id);         [DllImport("kernel32.dll")]
        public static extern UInt32 GlobalAddAtom( String lpString );        [DllImport("kernel32.dll")]
        public static extern UInt32 GlobalDeleteAtom( UInt32 nAtom );        public Hotkey(IntPtr hWnd)
        {
            this.hWnd = hWnd;
            System.Windows.Forms.Application.AddMessageFilter(this);
        }        public int RegisterHotkey(System.Windows.Forms.Keys Key, KeyFlags keyflags)
        {
            UInt32 hotkeyid = GlobalAddAtom(System.Guid.NewGuid().ToString());
            RegisterHotKey( (IntPtr)hWnd, hotkeyid, (UInt32)keyflags, (UInt32)Key);
            keyIDs.Add(hotkeyid, hotkeyid);
            return (int)hotkeyid;
        }        public void UnregisterHotkeys()
        {
            System.Windows.Forms.Application.RemoveMessageFilter(this);
            foreach (UInt32 key in keyIDs.Values)
            {
                UnregisterHotKey(hWnd, key); 
                GlobalDeleteAtom(key);
            }
        }        public bool PreFilterMessage(ref System.Windows.Forms.Message m) 
        {
            if (m.Msg == 0x312)
            {
                if(OnHotkey != null) 
                {
                    foreach (UInt32 key in keyIDs.Values)
                    {
                        if((UInt32)m.WParam == key)
                        {
                            OnHotkey((int)m.WParam);
                            return true;
                        }
                    }
                }
            }
            return false;
        }
    }
}
该类的使用方法：在窗体的类中声明一个变量
private int Hotkey1在窗体的Load事件中加入如下代码
Hotkey hotkey;
hotkey = new Hotkey(this.Handle);
Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.F1, Hotkey.KeyFlags.MOD_CONTROL);//定义快键(Ctrl + F1)
hotkey.OnHotkey += new HotkeyEventHandler(OnHotkey);添加快键调用函数 public void OnHotkey(int HotkeyID)
{
    if(HotkeyID == Hotkey1)
    {
        if(this.Visible == true)
            this.Visible = false;
        else
            this.Visible = true;
    }
    else
    {
        this.Visible = false;
    }
}

Answer 4

这个好像有点问题,当窗口有多个时
 if(HotkeyID == Hotkey1)
    {
        if(this.Visible == true)
            this.Visible = false;
        else
            this.Visible = true;
    }
    else
    {
        this.Visible = false;
    }
里面的this只认第一个窗口.