working on win32 uwp! and libremidi update

include/libremidi/backends/coremidi/helpers.hpp

@@ -1,7 +1,9 @@
 #pragma once
 #include <libremidi/detail/memory.hpp>
 #include <libremidi/detail/midi_api.hpp>
+#include <libremidi/error_handler.hpp>
 #include <libremidi/input_configuration.hpp>
+#include <libremidi/backends/coremidi/error_domain.hpp>
 
 #include <CoreMIDI/CoreMIDI.h>
 #include <CoreServices/CoreServices.h>
@@ -28,7 +30,8 @@ namespace
 static inline std::string get_string_property(MIDIObjectRef object, CFStringRef property) noexcept
 {
   CFStringRef res;
-  MIDIObjectGetStringProperty(object, property, &res);
+  if (MIDIObjectGetStringProperty(object, property, &res) || !res)
+    return {};
 
   char name[256];
   CFStringGetCString(res, name, sizeof(name), kCFStringEncodingUTF8);
@@ -215,15 +218,15 @@ locate_object(auto& self, const port_information& info, MIDIObjectType requested
   auto ret = MIDIObjectFindByUniqueID(uid, &object, &type);
   if (ret != noErr)
   {
-    self.template error<invalid_parameter_error>(
-        self.configuration, "coremidi::locate_object: cannot find port: " + info.port_name);
+    self.libremidi_handle_error(
+        self.configuration, "cannot find port: " + info.port_name);
     return 0;
   }
 
   if (type != requested_type || object == 0)
   {
-    self.template error<invalid_parameter_error>(
-        self.configuration, "coremidi::locate_object: invalid object: " + info.port_name + " : "
+    self.libremidi_handle_error(
+        self.configuration, "invalid object: " + info.port_name + " : "
                                 + std::to_string(object));
     return 0;
   }
@@ -255,6 +258,13 @@ struct coremidi_data
     }
   }
 
+  void close_client(auto& self)
+  {
+    self.client_open_ = std::errc::not_connected;
+    if (!self.configuration.context)
+      MIDIClientDispose(self.client);
+  }
+
   static uint64_t time_in_nanos(MIDITimeStamp tp) noexcept
   {
     if (tp == 0)
@@ -319,6 +329,23 @@ struct coremidi_data
       }
     }
   }
+
+  stdx::error close_port()
+  {
+    if (this->endpoint)
+    {
+      MIDIEndpointDispose(this->endpoint);
+      this->endpoint = 0;
+    }
+
+    if (this->port)
+    {
+      MIDIPortDispose(this->port);
+      this->port = 0;
+    }
+
+    return stdx::error{};
+  }
 };
 
 }