WPF Application single instance
for WPF if you want to have a single instance (for one session) you can use this code
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public class ApplicationSingleInstance : Application { protected override void OnStartup(StartupEventArgs e) { var currentSessionID = Process.GetCurrentProcess().SessionId; var currentProcessId = Process.GetCurrentProcess().Id; var exists = System.Diagnostics.Process.GetProcessesByName(System.IO.Path.GetFileNameWithoutExtension(System.Reflection.Assembly.GetEntryAssembly().Location)); var result = exists.Where(p => p.SessionId == currentSessionID && p.Id != currentProcessId) .OrderBy(p => p.Id) .ToList(); if (result.Count > 0) { #if MESSAGE string s = ""; int i = 0; foreach (var item in result) { s += "[" + i + "] handle window = " + result[i].MainWindowHandle + " Process ID = " + result[i].Id + "\n"; i++; } MessageBox.Show(s); #endif UnMinimizeClass.Reactivate(result.First()); Environment.Exit(0); return; } base.OnStartup(e); } } public static class UnMinimizeClass { #region Imports [DllImport("user32.dll")] static extern bool AllowSetForegroundWindow(int dwProcessId); [DllImport("user32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd); [DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow); [DllImport("user32.dll", SetLastError = true)] static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, long uFlags); [DllImport("user32.dll", SetLastError = true)] static extern IntPtr FindWindow(string lpClassName, string lpWindowName); [DllImport("user32.dll", SetLastError = true)] static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow); [DllImport("user32.dll", SetLastError = true)] static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId); [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)] static extern int GetWindowText(IntPtr hWnd, StringBuilder lpString, int nMaxCount); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] static extern int GetWindowTextLength(IntPtr hWnd); [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)] static extern int GetClassName(IntPtr hWnd, StringBuilder lpClassName, int nMaxCount); [DllImport("user32.dll")] public static extern int EnumWindows(CallBackPtr callPtr, int lPar); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool IsWindowVisible(IntPtr hWnd); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] static extern bool IsIconic(IntPtr hWnd); [DllImport("user32.dll")] static extern bool IsZoomed(IntPtr hWnd); public delegate bool CallBackPtr(IntPtr hwnd, int lParam); #endregion #region const private const int SW_RESTORE = 9; private const int SW_HIDE = 0; private const int SW_MINIMIZE = 6; private const int SW_MAXIMIZE = 3; private const int SW_SHOW = 5; static readonly IntPtr HWND_TOPMOST = new IntPtr(-1); static readonly IntPtr HWND_NOTOPMOST = new IntPtr(-2); static readonly IntPtr HWND_TOP = new IntPtr(0); static readonly IntPtr HWND_BOTTOM = new IntPtr(1); private static class SWP { public static readonly int NOSIZE = 0x0001, NOMOVE = 0x0002, NOZORDER = 0x0004, NOREDRAW = 0x0008, NOACTIVATE = 0x0010, DRAWFRAME = 0x0020, FRAMECHANGED = 0x0020, SHOWWINDOW = 0x0040, HIDEWINDOW = 0x0080, NOCOPYBITS = 0x0100, NOOWNERZORDER = 0x0200, NOREPOSITION = 0x0200, NOSENDCHANGING = 0x0400, DEFERERASE = 0x2000, ASYNCWINDOWPOS = 0x4000; } #endregion #region private functions private static IntPtr GetWindowHandle(uint processId) { IntPtr result = IntPtr.Zero; UnMinimizeClass.EnumWindows((hCurWnd, param) => { uint dwProcessID = 0; GetWindowThreadProcessId(hCurWnd, out dwProcessID); if (dwProcessID == processId && IsWindowVisible(hCurWnd)) { result = hCurWnd; return false; } return true; }, 0); return result; } private static string GetWindowClassName(IntPtr hWnd) { StringBuilder ClassName = new StringBuilder(256); int nRet = GetClassName(hWnd, ClassName, ClassName.Capacity); return nRet != 0 ? ClassName.ToString() : null; } private static string GetWindowTitle(IntPtr hWnd) { // Allocate correct string length first int length = GetWindowTextLength(hWnd); StringBuilder sb = new StringBuilder(length + 1); GetWindowText(hWnd, sb, sb.Capacity); return sb.ToString(); } private static int GetWindowStat(IntPtr hWnd) { if (!IsWindowVisible(hWnd)) return SW_HIDE; else if (IsIconic(hWnd)) return SW_MINIMIZE; else if (IsZoomed(hWnd)) return SW_MAXIMIZE; else return SW_SHOW; } #endregion #region public Reactivate public static void Reactivate(Process process) { IntPtr handle = process.MainWindowHandle; if (process.MainWindowHandle.ToInt32() == 0) { handle = GetWindowHandle((uint)process.Id); #if MESSAGE MessageBox.Show("pointeur a zero = " + handle + " window handle = " + FindWindow(null, "XXX")); #endif } Reactivate(handle, process.Id); } public static void Reactivate(IntPtr handle, int processId) { int stat = GetWindowStat(handle); if (stat == SW_MAXIMIZE) { SetForegroundWindow(handle); SetWindowPos(handle, (IntPtr)HWND_TOP, 0, 0, 0, 0, SWP.NOMOVE | SWP.NOSIZE | SWP.SHOWWINDOW); } else if (stat == SW_HIDE) { ShowWindow(handle, SW_SHOW); SetForegroundWindow(handle); SetWindowPos(handle, (IntPtr)HWND_TOP, 0, 0, 0, 0, SWP.NOMOVE | SWP.NOSIZE | SWP.SHOWWINDOW); } else { ShowWindow(handle, (int)SW_RESTORE); SetForegroundWindow(handle); SetWindowPos(handle, (IntPtr)HWND_TOP, 0, 0, 0, 0, SWP.NOMOVE | SWP.NOSIZE | SWP.SHOWWINDOW); } } #endregion } |
and hinerite your App class from ApplicationSingleInstance
don’t forget to change in App Xaml like this
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<local:ApplicationSingleInstance x:Class="XX.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:XX" ... |
if your namespace is XX
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