C#调用SendMessage刷新任务栏图标(强制结束时图标未消失)

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本文参考C++改写 https://blog.csdn.net/dpsying/article/details/20139651 (该文章的坐标理解的有误解,会导致功能无效)

SendMessage的移动鼠标里的坐标是基于句柄内的坐标，并不是屏幕坐标，任务栏宽度300 高度固定40，那么就应该从宽度0-300 坐标15之间移动过去。

首先声明需要用到的 winapi 函数

 1         [DllImport("user32.dll", EntryPoint = "FindWindow")]
 2         private static extern int FindWindow(string lpszClass, string lpszWindow);
 3         [DllImport("user32.dll", EntryPoint = "FindWindowEx")]
 4         private static extern int FindWindowEx(int hwndParent, int hwndChildAfter, string lpszClass, string lpszWindow);
 5 
 6         [DllImport("user32.dll", EntryPoint = "GetWindowRect")]
 7         private static extern int GetWindowRect(int hwnd, ref System.Drawing.Rectangle lpRect);
 8         [DllImport("user32.dll", EntryPoint = "SendMessage")]
 9         private static extern int SendMessage(int hwnd, int wMsg, int wParam, int lParam);
10 
11         private static readonly int WM_MOUSEMOVE = 512;

winapi

封装调用的流程方法

 1         /// <summary>
 2         /// 刷新任务栏图标
 3         /// </summary>
 4         public static void RefreshTaskbarIcon()
 5         {
 6             //任务栏窗口
 7             int one = FindWindow("Shell_TrayWnd", null);
 8             //任务栏右边托盘图标+时间区
 9             int two = FindWindowEx(one, 0, "TrayNotifyWnd", null);
10             //不同系统可能有可能没有这层
11             int three = FindWindowEx(two, 0, "SysPager", null);
12             //托盘图标窗口
13             int foor;
14             if (three > 0)
15             {
16                 foor = FindWindowEx(three, 0, "ToolbarWindow32", null);
17             }
18             else
19             {
20                 foor = FindWindowEx(two, 0, "ToolbarWindow32", null);
21             }
22             if (foor > 0)
23             {
24                 System.Drawing.Rectangle r = new System.Drawing.Rectangle();
25                 GetWindowRect(foor, ref r);
26                 //从任务栏左上角从左到右 MOUSEMOVE一遍，所有图标状态会被更新
27                 for (int x = 0; x < (r.Right - r.Left) - r.X; x++)
28                 {
29                     SendMessage(foor, WM_MOUSEMOVE, 0, (1 << 16) | x);
30                 }
31             }
32         }