[dotnet]how to change dll load path?

[shutaozhenzhen]

Trying to use puerts in a unity game dll mod. So I use the PUERTS_GENERAL, but failed to load puerts.dll. How to change the dll load path by dll import?

[chexiongsheng]

It is a dynamic library loaded by C# pinvoke. The DllImport attribute has only one dllName parameter.

https://github.com/Tencent/puerts/blob/master/unity/Assets/core/upm/Runtime/Src/Default/Native/PuertsDLL.cs#L101

[DoctorGester]

You can use NativeLibrary.SetDllImportResolver i.e.

    private static string? EnvironmentToLibraryName() {
        if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX)) {
            return "puerts_macos";
        }

        if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) {
            return RuntimeInformation.ProcessArchitecture switch {
                Architecture.X64 => "puerts_windows_x86_64",
                Architecture.X86 => "puerts_windows_x86",
                _ => null
            };
        }

        if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux) && RuntimeInformation.ProcessArchitecture == Architecture.X64) {
            return "puerts_linux_x86_64";
        }

        return null;
    }

    public static void SetCustomDllImportResolver() {
        NativeLibrary.SetDllImportResolver(Assembly.GetExecutingAssembly(), (name, assembly, path) => {
            if (name == "puerts") {
                var libraryName = EnvironmentToLibraryName();

                if (libraryName is null) {
                    throw new Exception($"Unsupported puerts library binary for {RuntimeInformation.RuntimeIdentifier} {RuntimeInformation.ProcessArchitecture}");
                }
                
                return NativeLibrary.Load(libraryName, assembly, path);
            }

            return NativeLibrary.Load(name, assembly, path);
        });
    }
    ```