C# 調用SendMessage刷新任務欄圖標(強制結束時圖標未消失)

本文參考C++改寫 https://blog.csdn.net/dpsying/article/details/20139651  (該文章的坐標理解的有誤解,會導致功能無效)

SendMessage的移動鼠標里的坐標 是基於句柄內的 坐標，並不是屏幕坐標，任務欄寬度300 高度固定40，那么就應該從寬度0-300 坐標15之間 移動過去。

首先聲明需要用到的 winapi 函數

        [DllImport("user32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpszClass, string lpszWindow);
        [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
        private static extern int FindWindowEx(int hwndParent, int hwndChildAfter, string lpszClass, string lpszWindow);

        [DllImport("user32.dll", EntryPoint = "GetWindowRect")]
        private static extern int GetWindowRect(int hwnd, ref System.Drawing.Rectangle lpRect);
        [DllImport("user32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);

        private static readonly int WM_MOUSEMOVE = 512;

封裝調用的流程方法

        /// <summary>
        /// 刷新任務欄圖標
        /// </summary>
        public static void RefreshTaskbarIcon()
        {
            //任務欄窗口
            int one = FindWindow("Shell_TrayWnd", null);
            //任務欄右邊托盤圖標+時間區
            int two = FindWindowEx(one, 0, "TrayNotifyWnd", null);
            //不同系統可能有可能沒有這層
            int three = FindWindowEx(two, 0, "SysPager", null);
            //托盤圖標窗口
            int foor;
            if (three > 0)
            {
                foor = FindWindowEx(three, 0, "ToolbarWindow32", null);
            }
            else
            {
                foor = FindWindowEx(two, 0, "ToolbarWindow32", null);
            }
            if (foor > 0)
            {
                System.Drawing.Rectangle r = new System.Drawing.Rectangle();
                GetWindowRect(foor, ref r);
                //從任務欄左上角從左到右 MOUSEMOVE一遍，所有圖標狀態會被更新
                for (int x = 0; x < (r.Right - r.Left) - r.X; x++)
                {
                    SendMessage(foor, WM_MOUSEMOVE, 0, (1 << 16) | x);
                }
            }
        }