我正在开发一个应用程序，它应该能够显示和检索系统中所有进程的信息。
我尝试使用函数QueryFullProcessImageName获取进程的完整路径，但失败并显示错误31（连接到系统的设备不工作），这种情况仅发生在程序首次枚举运行进程后创建的新进程中。
下面是我用来获取完整路径的方法：

public static string GetProcessFullPath(SafeProcessHandle Handle)
    {
        uint MaxPathLength = 1024;
        StringBuilder ExePath = new StringBuilder(1024);
        if (NativeMethods.Win32ProcessFunctions.QueryFullProcessImageName(Handle.DangerousGetHandle(), 0, ExePath, ref MaxPathLength))
        {
            return ExePath.ToString();
        }
        else
        {
            Win32Exception ex = new Win32Exception(Marshal.GetLastWin32Error());
            Logger.WriteEntry(new LogEntry("Non è stato possibile recuperare il percorso completo dell'eseguibile di un processo, codice di errore: " + ex.NativeErrorCode + " (" + ex.Message + ")", EventSource.WindowsAPI, EventSeverity.Error));
            return "Non disponibile";
        }
    }

下面是函数的声明：

[DllImport("Kernel32.dll", EntryPoint = "QueryFullProcessImageNameW", SetLastError = true, CharSet = CharSet.Unicode)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool QueryFullProcessImageName(IntPtr ProcessHandle, uint PathType, StringBuilder ExePath, ref uint Characters);

我不知道导致此错误的原因，我从WMI（Win32_ProcessStartTrace）收到新进程的通知。
这就是我获取GetProcessFullPath方法中使用的进程句柄的方式（PID来自WMI通知）：

public static SafeProcessHandle GetProcessHandle(uint ProcessID)
    {
        IntPtr UnsafeProcessHandle = NativeMethods.Win32ProcessFunctions.OpenProcess(NativeMethods.Win32Enumerations.ProcessAccessRights.PROCESS_ALL_ACCESS, false, ProcessID);
        if (UnsafeProcessHandle == IntPtr.Zero)
        {
            UnsafeProcessHandle = NativeMethods.Win32ProcessFunctions.OpenProcess(NativeMethods.Win32Enumerations.ProcessAccessRights.PROCESS_QUERY_LIMITED_INFORMATION, false, ProcessID);
            if (UnsafeProcessHandle == IntPtr.Zero)
            {
                Win32Exception ex = new Win32Exception(Marshal.GetLastWin32Error());
                Logger.WriteEntry(new LogEntry("Non è stato possibile aprire un processo, codice di errore: " + ex.NativeErrorCode + " (" + ex.Message + ")", EventSource.WindowsAPI, EventSeverity.Error));
                return new SafeProcessHandle(UnsafeProcessHandle, true);
            }
            else
            {
                return new SafeProcessHandle(UnsafeProcessHandle, true);
            }
        }
        else
        {
            return new SafeProcessHandle(UnsafeProcessHandle, true);
        }
    }

编辑：进一步的测试表明，即使我试图获取其完整路径的进程在调用函数时已经启动，也会发生问题。