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POC# show hidden window
 

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    <p>I am developing an add in for excel. At some point, I can receive async events. I need to be able to show the Excel window if hidden on these events.</p> <p>I am able to store the <code>Hwnd</code> property, which I believe must be an immutable int/reference to identify my Excel window.</p> <p>Can someone elaborate on this Hwnd ? and explain how I can show a hidden window from C# using it ?</p> <p>Thanks in advance folks ;)</p> <p>UPDATE : shortly, that was the piece of code that sorted my problems :</p> <pre><code> /// &lt;summary&gt;Enumeration of the different ways of showing a window using /// ShowWindow&lt;/summary&gt; private enum WindowShowStyle : uint { /// &lt;summary&gt;Hides the window and activates another window.&lt;/summary&gt; /// &lt;remarks&gt;See SW_HIDE&lt;/remarks&gt; Hide = 0, /// &lt;summary&gt;Activates and displays a window. If the window is minimized /// or maximized, the system restores it to its original size and /// position. An application should specify this flag when displaying /// the window for the first time.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWNORMAL&lt;/remarks&gt; ShowNormal = 1, /// &lt;summary&gt;Activates the window and displays it as a minimized window.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWMINIMIZED&lt;/remarks&gt; ShowMinimized = 2, /// &lt;summary&gt;Activates the window and displays it as a maximized window.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWMAXIMIZED&lt;/remarks&gt; ShowMaximized = 3, /// &lt;summary&gt;Maximizes the specified window.&lt;/summary&gt; /// &lt;remarks&gt;See SW_MAXIMIZE&lt;/remarks&gt; Maximize = 3, /// &lt;summary&gt;Displays a window in its most recent size and position. /// This value is similar to "ShowNormal", except the window is not /// actived.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWNOACTIVATE&lt;/remarks&gt; ShowNormalNoActivate = 4, /// &lt;summary&gt;Activates the window and displays it in its current size /// and position.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOW&lt;/remarks&gt; Show = 5, /// &lt;summary&gt;Minimizes the specified window and activates the next /// top-level window in the Z order.&lt;/summary&gt; /// &lt;remarks&gt;See SW_MINIMIZE&lt;/remarks&gt; Minimize = 6, /// &lt;summary&gt;Displays the window as a minimized window. This value is /// similar to "ShowMinimized", except the window is not activated.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWMINNOACTIVE&lt;/remarks&gt; ShowMinNoActivate = 7, /// &lt;summary&gt;Displays the window in its current size and position. This /// value is similar to "Show", except the window is not activated.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWNA&lt;/remarks&gt; ShowNoActivate = 8, /// &lt;summary&gt;Activates and displays the window. If the window is /// minimized or maximized, the system restores it to its original size /// and position. An application should specify this flag when restoring /// a minimized window.&lt;/summary&gt; /// &lt;remarks&gt;See SW_RESTORE&lt;/remarks&gt; Restore = 9, /// &lt;summary&gt;Sets the show state based on the SW_ value specified in the /// STARTUPINFO structure passed to the CreateProcess function by the /// program that started the application.&lt;/summary&gt; /// &lt;remarks&gt;See SW_SHOWDEFAULT&lt;/remarks&gt; ShowDefault = 10, /// &lt;summary&gt;Windows 2000/XP: Minimizes a window, even if the thread /// that owns the window is hung. This flag should only be used when /// minimizing windows from a different thread.&lt;/summary&gt; /// &lt;remarks&gt;See SW_FORCEMINIMIZE&lt;/remarks&gt; ForceMinimized = 11 } [DllImport("user32.dll")] static extern bool ShowWindow(IntPtr hWnd, WindowShowStyle nCmdShow); static void ContentClick(object obj, EventArgs ea) { Microsoft.Office.Interop.Excel.Application oExcelApp = (Microsoft.Office.Interop.Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application"); oExcelApp.Visible = true; ShowWindow( (System.IntPtr) Globals.ThisWorkbook.Application.Hwnd, WindowShowStyle.ShowMaximized); } </code></pre>
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