Added to determine which processes block a file

I18N Commander/Processor/GetBlockingProcesses.cs

@@ -0,0 +1,135 @@
+namespace Processor;
+
+//
+// Source: https://stackoverflow.com/a/20623311/2258393
+//
+
+using System;
+using System.Diagnostics;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+
+public static class SystemUtil
+{
+    [StructLayout(LayoutKind.Sequential)]
+    private struct RM_UNIQUE_PROCESS
+    {
+        public readonly int dwProcessId;
+        private readonly System.Runtime.InteropServices.ComTypes.FILETIME ProcessStartTime;
+    }
+
+    private const int RM_REBOOT_REASON_NONE = 0;
+    private const int CCH_RM_MAX_APP_NAME = 255;
+    private const int CCH_RM_MAX_SVC_NAME = 63;
+
+    private enum RM_APP_TYPE
+    {
+        RM_UNKNOWN_APP = 0,
+        RM_MAIN_WINDOW = 1,
+        RM_OTHER_WINDOW = 2,
+        RM_SERVICE = 3,
+        RM_EXPLORER = 4,
+        RM_CONSOLE = 5,
+        RM_CRITICAL = 1000
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    private struct RM_PROCESS_INFO
+    {
+        public readonly RM_UNIQUE_PROCESS Process;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_APP_NAME + 1)]
+        private readonly string strAppName;
+
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = CCH_RM_MAX_SVC_NAME + 1)]
+        private readonly string strServiceShortName;
+
+        private readonly RM_APP_TYPE ApplicationType;
+        private readonly uint AppStatus;
+        private readonly uint TSSessionId;
+        
+        [MarshalAs(UnmanagedType.Bool)]
+        private readonly bool bRestartable;
+    }
+
+    [DllImport("rstrtmgr.dll", CharSet = CharSet.Unicode)]
+    static extern int RmRegisterResources(uint pSessionHandle, UInt32 nFiles, string[] rgsFilenames, UInt32 nApplications, [In] RM_UNIQUE_PROCESS[] rgApplications, UInt32 nServices, string[] rgsServiceNames);
+
+    [DllImport("rstrtmgr.dll", CharSet = CharSet.Auto)]
+    static extern int RmStartSession(out uint pSessionHandle, int dwSessionFlags, string strSessionKey);
+
+    [DllImport("rstrtmgr.dll")]
+    static extern int RmEndSession(uint pSessionHandle);
+
+    [DllImport("rstrtmgr.dll")]
+    static extern int RmGetList(uint dwSessionHandle, out uint pnProcInfoNeeded, ref uint pnProcInfo, [In, Out] RM_PROCESS_INFO[] rgAffectedApps, ref uint lpdwRebootReasons);
+
+    /// <summary>
+    /// Find out what process(es) have a lock on the specified file.
+    /// </summary>
+    /// <param name="path">Path of the file.</param>
+    /// <returns>Processes locking the file</returns>
+    /// <remarks>See also:
+    /// http://msdn.microsoft.com/en-us/library/windows/desktop/aa373661(v=vs.85).aspx
+    /// http://wyupdate.googlecode.com/svn-history/r401/trunk/frmFilesInUse.cs (no copyright in code at time of viewing)
+    /// </remarks>
+    public static List<Process> WhoIsLocking(string path)
+    {
+        var key = Guid.NewGuid().ToString();
+        var processes = new List<Process>();
+
+        var res = RmStartSession(out var handle, 0, key);
+        if (res != 0)
+            return processes;
+
+        try
+        {
+            const int ERROR_MORE_DATA = 234;
+            uint pnProcInfoNeeded = 0, pnProcInfo = 0, lpdwRebootReasons = RM_REBOOT_REASON_NONE;
+            var resources = new[] { path }; // Just checking on one resource.
+            res = RmRegisterResources(handle, (uint)resources.Length, resources, 0, null!, 0, null!);
+
+            if (res != 0)
+                return processes;
+
+            //Note: there's a race condition here -- the first call to RmGetList() returns
+            //      the total number of process. However, when we call RmGetList() again to get
+            //      the actual processes this number may have increased.
+            res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, null!, ref lpdwRebootReasons);
+            if (res == ERROR_MORE_DATA)
+            {
+                // Create an array to store the process results
+                var processInfo = new RM_PROCESS_INFO[pnProcInfoNeeded];
+                pnProcInfo = pnProcInfoNeeded;
+
+                // Get the list
+                res = RmGetList(handle, out pnProcInfoNeeded, ref pnProcInfo, processInfo, ref lpdwRebootReasons);
+                if (res == 0)
+                {
+                    // Enumerate all of the results and add them to the list to be returned
+                    for (var i = 0; i < pnProcInfo; i++)
+                    {
+                        try
+                        {
+                            processes.Add(Process.GetProcessById(processInfo[i].Process.dwProcessId));
+                        }
+                        // catch the error -- in case the process is no longer running
+                        catch (ArgumentException)
+                        {
+                        }
+                    }
+                }
+                else
+                    return processes;
+            }
+            else if (res != 0)
+                return processes;
+        }
+        finally
+        {
+            RmEndSession(handle);
+        }
+
+        return processes;
+    }
+}