Fix parameter passing for .NET Framework domains

Author: br-sk

Diff for: clr_loader/netfx.py

@@ -14,13 +14,15 @@ def __init__(
     ):
         initialize()
         if config_file is not None:
-            config_file_s = str(config_file)
+            config_file_s = str(config_file).encode("utf8")
         else:
             config_file_s = ffi.NULL
 
+        domain_s = domain.encode("utf8") if domain else ffi.NULL
+
         self._domain_name = domain
         self._config_file = config_file
-        self._domain = _FW.pyclr_create_appdomain(domain or ffi.NULL, config_file_s)
+        self._domain = _FW.pyclr_create_appdomain(domain_s, config_file_s)
 
     def info(self) -> RuntimeInfo:
         return RuntimeInfo(
@@ -41,6 +43,11 @@ def _get_callable(self, assembly_path: StrOrPath, typename: str, function: str):
             function.encode("utf8"),
         )
 
+        if func == ffi.NULL:
+            raise RuntimeError(
+                f"Failed to resolve {typename}.{function} from {assembly_path}"
+            )
+
         return func
 
     def shutdown(self):

Diff for: netfx_loader/ClrLoader.cs

@@ -32,8 +32,10 @@ public static IntPtr CreateAppDomain(
             {
                 var setup = new AppDomainSetup
                 {
+                    ApplicationBase = AppDomain.CurrentDomain.BaseDirectory,
                     ConfigurationFile = configFile
                 };
+                Print($"Base: {AppDomain.CurrentDomain.BaseDirectory}");
                 var domain = AppDomain.CreateDomain(name, null, setup);
 
                 Print($"Located domain {domain}");