DriveInfo.GetDrives() crashes IL2CPP build

Code (CSharp):

1. using System;
2. using System.IO;
3. using UnityEngine;
4.  
5. public class TestGetDrives : MonoBehaviour
6. {
7.  
8.     // Update is called once per frame
9.     void Update()
10.     {
11.         if (Input.GetKeyUp(KeyCode.P))
12.         { GetDrives(); }
13.     }
14.     private void GetDrives()
15.     {
16.         try { Debug.Log("Trying GetDrives, found: " + DriveInfo.GetDrives().Length.ToString()); }
17.         catch (Exception ex) { Debug.Log("DriveInfo.GetDrives exception: " + ex.Message); }
18.     }
19. }

This script works flawlessly in the Editor and in Mono Builds, but if you build the app with IL2CPP, the app crashes whenever you hit P key.
player.log reports the crash, but no exception is raised even though the GetDrives() call is within a try/catch block.

Anyone has ideas?

Tested on 2019.3.9f1 - windows target platform.
Submitted as bug report, Case 1236557.

 

Can anyone please confirm if it happens on my system only?

 

I face the same issue now on Unity2019.4.6 and 2020.1.1....
I haven't find any solution about this issue.

 

To point future seekers from this thread to the right direction: https://issuetracker.unity3d.com/is...when-calling-driveinfo-dot-getdrives-in-build

Unity is aware that the

DriveInfo

class is not supported by IL2CPP, but they don't plan to fix this because the class only available for desktop platforms anyway and IL2CPP is supposed to be working the same across all platforms.

 

Sorry to dig up an old topic, but I really need to be able to determine drive space in an IL2CPP project. Given the situation is there any known workaround?

I've tried creating a managed plugin using DriveInfo, but this does not seem to survive compile (works in editor). Any ideas?

 

Well your managed plugin still uses DriveInfo...

If it's for mobile, you could create a native Plugin (in Java for Android, C++/Obj-C for iOS) that gets the remaining storage and use it instead of DriveInfo. For Android, it could be even simpler since you can call directly Java code from C#.

 

Thanks for the thoughts.

Unfortunately, I primarily need Desktop (Win/Mac). I've tried a few other solutions building native plugins in C++ and/or Obj-C but it's really a frustrating situation. Followed a bunch of random info out there without much luck (so far) but still grinding away.

Fundamentally I just need to be able to check free space at a given location (in case app is not on main drive) in Win/Mac. It really feels like an oversight that this functionality is not available in IL2CPP.

 

Then just go the native OS API/C++ way. For Windows, it's by using Win32/PInvoke:

Code (CSharp):

1. [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
2. [return: MarshalAs(UnmanagedType.Bool)]
3. public static extern bool GetDiskFreeSpaceEx(string lpDirectoryName,
4. out ulong lpFreeBytesAvailable,
5. out ulong lpTotalNumberOfBytes,
6. out ulong lpTotalNumberOfFreeBytes);
7.  
8. // Usage, results in bytes
9. GetDiskFreeSpaceEx(@"C:\", out var freeSpace, out var totalSpace, out var totalFreeSpace);

For macOS I don't know the exact code, but it should be quite similar (import a native DLL and invoke a method)