feat: Add new request types, world param, better error handling, various fixes (#558)

* feat: Add option for worlds to get data from other worlds

* docs: Add docs to new methods

* refactor: Add more error handling for potential edge cases

* fix: Catch exception for http listener start

* fix: Maybe stop throwing js exceptions at start from process check

* fix: Stop VRCX from dying if monitored processes are elevated

* fix: If auto close is turned off, update process states properly

* refactor: Limit db key length to 255, limit /getall to 10000 entries

WinApi.cs

@@ -23,5 +23,45 @@ namespace VRCX
         public static extern int SHParseDisplayName([MarshalAs(UnmanagedType.LPWStr)] string pszName, IntPtr pbc, out IntPtr ppidl, uint sfgaoIn, out uint psfgaoOut);
         [DllImport("shell32.dll", CharSet = CharSet.Auto)]
         public static extern IntPtr SHOpenFolderAndSelectItems(IntPtr pidlFolder, uint cidl, IntPtr[] apidl, uint dwFlags);
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);
+
+        [DllImport("kernel32.dll", SetLastError = true)]
+        public static extern bool GetExitCodeProcess(IntPtr hProcess, out uint lpExitCode);
+
+        /// <summary>
+        /// Flag that specifies the access rights to query limited information about a process.
+        /// This won't throw an exception when we try to access info about an elevated process
+        /// </summary>
+        private const int PROCESS_QUERY_LIMITED_INFORMATION = 0x1000;
+
+        /// <summary>
+        /// Determines whether the specified process has exited using WinAPI's GetExitCodeProcess running with PROCESS_QUERY_LIMITED_INFORMATION.
+        /// We do this because Process.HasExited in .net framework opens a handle with PROCESS_QUERY_INFORMATION, which will throw an exception if the process is elevated.
+        /// GetExitCodeProcess works with PROCESS_QUERY_LIMITED_INFORMATION, which will not throw an exception if the process is elevated.
+        /// https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getexitcodeprocess
+        /// </summary>
+        /// <param name="process">The process to check.</param>
+        /// <returns>true if the process has exited; otherwise, false.</returns>
+        internal static bool HasProcessExited(int processId)
+        {
+            IntPtr hProcess = WinApi.OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, processId);
+            if (hProcess == IntPtr.Zero)
+            {
+                // this is probably fine
+                return true;
+                //throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
+            }
+
+            bool exited;
+            if (!WinApi.GetExitCodeProcess(hProcess, out uint exitCode))
+            {
+                throw new System.ComponentModel.Win32Exception(Marshal.GetLastWin32Error());
+            }
+
+            // Fun fact, If a program uses STILL_ACTIVE (259) as an exit code, GetExitCodeProcess will return 259, since it returns... the exit code. This would break this function.
+            exited = exitCode != 259;
+            return exited;
+        }
     }
 }