Windows 7左键单击时钟popup

要显示时钟，您需要将相应的窗口消息发送到托盘窗口。 这可以使用Windows API函数SendMessage ：

 using System; using System.ComponentModel; using System.Runtime.InteropServices; using System.Text; class ShowCalendar { private delegate bool EnumChildCallback(IntPtr hwnd, ref IntPtr lParam); [DllImport("User32.dll")] private static extern bool EnumChildWindows(IntPtr hWndParent, EnumChildCallback lpEnumFunc, ref IntPtr lParam); [DllImport("User32.dll")] private static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount); [DllImport("user32.dll", CharSet = CharSet.Auto)] private static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam); [DllImport("user32.dll", SetLastError = true)] private static extern IntPtr FindWindow(string lpClassName, string lpWindowName); [DllImport("user32.dll", SetLastError = true)] private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect); [StructLayout(LayoutKind.Sequential)] private struct RECT { public int Left; public int Top; public int Right; public int Bottom; } private static readonly string TrayWndClassName = "Shell_TrayWnd"; private static readonly string TrayNotifyWndClassName = "TrayNotifyWnd"; private static readonly string ClockWndClassName = "TrayClockWClass"; private static readonly uint WM_NCLBUTTONDOWN = 0x00A1; private static readonly uint HTCAPTION = 2; private static bool EnumChildProc(IntPtr hwndChild, ref IntPtr lParam) { StringBuilder className = new StringBuilder(128); GetClassName(hwndChild, className, 128); if (className.ToString() == ClockWndClassName) { lParam = hwndChild; return false; } return true; } static void Main(string[] args) { IntPtr hWndTray = FindWindow(TrayWndClassName, string.Empty); if (hWndTray == IntPtr.Zero) { throw new Win32Exception(); } IntPtr hWndTrayNotify = FindWindowEx(hWndTray, IntPtr.Zero, TrayNotifyWndClassName, string.Empty); if (hWndTrayNotify == IntPtr.Zero) { throw new Win32Exception(); } // search clock window EnumChildCallback cb = new EnumChildCallback(EnumChildProc); IntPtr hWndClock = IntPtr.Zero; EnumChildWindows(hWndTray, cb, ref hWndClock); if (hWndClock == IntPtr.Zero) { throw new Win32Exception(); } // get clock window position RECT rect; if (!GetWindowRect(hWndClock, out rect)) { throw new Win32Exception(); } // send click, lParam contains window position IntPtr wParam = new IntPtr(HTCAPTION); IntPtr lParam = new IntPtr(rect.Top << 16 | rect.Left); SendMessage(hWndTray, WM_NCLBUTTONDOWN, wParam, lParam); } }