private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
//卸载钩子
CWin32Api.UnhookWindowsHookEx(hookHandle);
}
private void Form1_Load(object sender, EventArgs e)
{
hookproc = new CWin32Api.HookProc(MouseEvent); //为委托变量赋值（方法名）
hookHandle = CWin32Api.SetWindowsHookEx(MOUSEHOOK, hookproc, IntPtr.Zero, 0); //安装钩子
}