MAUI on iOS: DllNotFoundException

[DamianAtIQVIA]

When I try to open a DB connection I get System.DllNotFoundException. It seems like there is no native libraries for iOS (and probably for Android too):

2024-10-23 09:09:26.123078+0200 DuckDbMauiIssue[39958:8162189] System.TypeInitializationException: The type initializer for 'DuckDB.NET.Data.DuckDBConnectionStringBuilder' threw an exception. ---> System.DllNotFoundException: duckdb at DuckDB.NET.Data.DuckDBConnectionStringBuilder..cctor() 2024-10-23 09:09:26.123281+0200 DuckDbMauiIssue[39958:8162189] --- End of inner exception stack trace --- at DuckDB.NET.Data.DuckDBConnection.get_ParsedConnection() at DuckDB.NET.Data.DuckDBConnection.Open() at System.Data.Common.DbConnection.OpenAsync(CancellationToken cancellationToken) 2024-10-23 09:09:26.123495+0200 DuckDbMauiIssue[39958:8162189] --- End of stack trace from previous location --- at DuckDbMauiIssue.MainPage.OnCounterClicked(Object sender, EventArgs e) in /Users/.../Projects/temp/DuckDbMauiIssue/MainPage.xaml.cs:line 17

You can reproduce the issue running this project:
https://github.com/DamianAtIQVIA/DuckDbMauiIssue

[Giorgi]

Can you try including libduckdb.dylib from libduckdb-osx-universal.zip to see if that works?

[DamianAtIQVIA]

I included the library but the same exception is thrown.
I also added loading two deli's in the Main: One is libxamarin-dotnet-debug.dylib, the other is libduckdb.dylib. The code checks if a file exists (both) and if the library can be loaded (fails for ducked).

See the latest commit (9d711b387a2314ca12bb06a37c76a6a3b2fca8ab) in https://github.com/DamianAtIQVIA/DuckDbMauiIssue

[Giorgi]

So if I understood correctly, File.Exists returns true for both of them, but loading fails for DuckDB? I'm not sure whether the library in libduckdb-osx-universal.zip is the one you should be including on iOS, can you ask on the official discord?

There is also duckdb-swift but I'm not sure if that project compiles its own native library or not.