C# WinForm ShowInTaskbar Api Version

  1 using System;
  2 using System.Runtime.InteropServices;
  3 
  4 namespace x
  5 {
  6     unsafe class NativeWindow
  7     {
  8         /*
  9          * Window field offsets for GetWindowLong()
 10          */
 11         public const int GWL_WNDPROC = (-4);
 12         public const int GWL_HINSTANCE = (-6);
 13         public const int GWL_HWNDPARENT = (-8);
 14         public const int GWL_STYLE = (-16);
 15         public const int GWL_EXSTYLE = (-20);
 16         public const int GWL_USERDATA = (-21);
 17         public const int GWL_ID = (-12);
 18 
 19         public const int GWLP_WNDPROC = (-4);
 20         public const int GWLP_HINSTANCE = (-6);
 21         public const int GWLP_HWNDPARENT = (-8);
 22         public const int GWLP_USERDATA = (-21);
 23         public const int GWLP_ID = (-12);
 24 
 25 
 26 
 27         /*
 28          * ShowWindow() Commands
 29          */
 30         public const int SW_HIDE = 0;
 31         public const int SW_SHOWNORMAL = 1;
 32         public const int SW_NORMAL = 1;
 33         public const int SW_SHOWMINIMIZED = 2;
 34         public const int SW_SHOWMAXIMIZED = 3;
 35         public const int SW_MAXIMIZE = 3;
 36         public const int SW_SHOWNOACTIVATE = 4;
 37         public const int SW_SHOW = 5;
 38         public const int SW_MINIMIZE = 6;
 39         public const int SW_SHOWMINNOACTIVE = 7;
 40         public const int SW_SHOWNA = 8;
 41         public const int SW_RESTORE = 9;
 42         public const int SW_SHOWDEFAULT = 10;
 43         public const int SW_FORCEMINIMIZE = 11;
 44         public const int SW_MAX = 11;
 45 
 46 
 47         [DllImport("user32.dll")]
 48         public static extern IntPtr GetTaskmanWindow();
 49 
 50         [DllImport("user32.dll")]
 51         public static extern IntPtr SendMessageA(
 52           [In] IntPtr   hWnd,
 53           [In] int   Msg,
 54           [In] IntPtr wParam,
 55           [In] IntPtr lParam
 56         );
 57 
 58         [DllImport("user32.dll")]
 59         public static extern int SetWindowLongA(
 60           [In] IntPtr hWnd,
 61           [In] int nIndex,
 62           [In] int dwNewLong
 63         );
 64 
 65         [DllImport("user32.dll")]
 66         public static extern IntPtr SetWindowLongPtrA(
 67           [In] IntPtr hWnd,
 68           [In] int nIndex,
 69           [In] IntPtr dwNewLong
 70         );
 71 
 72         [DllImport("user32.dll")]
 73         public static extern bool ShowWindow(
 74           [In] IntPtr hWnd,
 75           [In] int nCmdShow
 76         );
 77 
 78         private IntPtr _hWnd;
 79         private bool _bShowInTaskbar;
 80 
 81         public bool ShowInTaskbar
 82         {
 83             get { return _bShowInTaskbar; }
 84 
 85             set
 86             {
 87                 if (value)
 88                 {
 89                     SetWindowLongCore(_hWnd, GWLP_HWNDPARENT, GetTaskmanWindow());
 90                 }
 91                 else
 92                 {
 93                     SetWindowLongCore(_hWnd, GWLP_HWNDPARENT, (IntPtr)0);
 94                 }
 95                 SendMessageA(hwndroot, WM_SETREDRAW, (IntPtr)0, (IntPtr)0);
 96                 ShowWindow(hwndroot, SW_HIDE);
 97                 ShowWindow(hwndroot, SW_SHOW);
 98                 SendMessageA(hwndroot, WM_SETREDRAW, (IntPtr)1, (IntPtr)0);
 99                 _bShowInTaskbar = value;
100             }
101         }
102 
103         public NativeWindow() { }
104 
105         public static IntPtr SetWindowLongCore(IntPtr hWnd, int nIndex, IntPtr dwNewLong)
106         {
107             if (sizeof(void*) == 4)
108             {
109                 return (IntPtr)SetWindowLongA(hWnd, nIndex, (int)dwNewLong);
110             }
111             return SetWindowLongPtrA(hWnd, nIndex, dwNewLong);
112         }
113 
114     }
115 }

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