1、窗体热键
首先要设置主窗体KeyPreview为true,可直接在属性中进行设置,
或者在窗体加载中设置: this.KeyPreview = true;
然后添加窗体KeyDown事件,如下:
private void FrmMain_KeyDown(object sender, KeyEventArgs e)
{
if (e.Alt && e.Shift && e.Control && e.KeyCode == Keys.S)
{
MessageBox.Show("我按了Control +Shift +Alt +S");
}
}
2、全局热键设置
定义API函数 》 注册热键 》 卸载热键
我这里定义了AppHotKey类,全部代码如下:
public class AppHotKey
{
[DllImport("kernel32.dll")]
public static extern uint GetLastError();
//如果函数执行成功,返回值不为0。
//如果函数执行失败,返回值为0。要得到扩展错误信息,调用GetLastError。
[DllImport("user32.dll", SetLastError = true)]
public static extern bool RegisterHotKey(
IntPtr hWnd, //要定义热键的窗口的句柄
int id, //定义热键ID(不能与其它ID重复)
KeyModifiers fsModifiers, //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效
Keys vk //定义热键的内容
);
[DllImport("user32.dll", SetLastError = true)]
public static extern bool UnregisterHotKey(
IntPtr hWnd, //要取消热键的窗口的句柄
int id //要取消热键的ID
);
//定义了辅助键的名称(将数字转变为字符以便于记忆,也可去除此枚举而直接使用数值)
[Flags()]
public enum KeyModifiers
{
None = 0,
Alt = 1,
Ctrl = 2,
Shift = 4,
WindowsKey = 8
}
/// <summary>
/// 注册热键
/// </summary>
/// <param name="hwnd">窗口句柄</param>
/// <param name="hotKey_id">热键ID</param>
/// <param name="keyModifiers">组合键</param>
/// <param name="key">热键</param>
public static void RegKey(IntPtr hwnd, int hotKey_id, KeyModifiers keyModifiers, Keys key)
{
try
{
if (!RegisterHotKey(hwnd, hotKey_id, keyModifiers, key))
{
if (Marshal.GetLastWin32Error() == 1409) { MessageBox.Show("热键被占用 !"); }
else
{
MessageBox.Show("注册热键失败!");
}
}
}
catch (Exception) { }
}
/// <summary>
/// 注销热键
/// </summary>
/// <param name="hwnd">窗口句柄</param>
/// <param name="hotKey_id">热键ID</param>
public static void UnRegKey(IntPtr hwnd, int hotKey_id)
{
//注销Id号为hotKey_id的热键设定
UnregisterHotKey(hwnd, hotKey_id);
}
}
重写窗体的WndProc函数,在窗口创建的时候注册热键,窗口销毁时销毁热键,代码如下:
private const int WM_HOTKEY = 0x312; //窗口消息-热键
private const int WM_CREATE = 0x1; //窗口消息-创建
private const int WM_DESTROY = 0x2; //窗口消息-销毁
private const int Space = 0x3572; //热键ID
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
switch (m.Msg)
{
case WM_HOTKEY: //窗口消息-热键ID
switch (m.WParam.ToInt32())
{
case Space: //热键ID
MessageBox.Show("我按了Control +Shift +Alt +S");
break;
default:
break;
}
break;
case WM_CREATE: //窗口消息-创建
AppHotKey.RegKey(Handle, Space, AppHotKey.KeyModifiers.Ctrl | AppHotKey.KeyModifiers.Shift | AppHotKey.KeyModifiers.Alt, Keys.S);
break;
case WM_DESTROY: //窗口消息-销毁
AppHotKey.UnRegKey(Handle, Space); //销毁热键
break;
default:
break;
}
}