winrt: Show some exceptions

src/fe-gtk/notifications/notification-backend.h

@@ -21,7 +21,7 @@
 
 int notification_backend_supported (void);
 void notification_backend_show (const char *title, const char *text);
-int notification_backend_init (void);
+int notification_backend_init (const char **error);
 void notification_backend_deinit (void);
 
 #endif

src/fe-gtk/notifications/notification-windows.c

@@ -24,7 +24,7 @@
 #include <Windows.h>
 
 void (*winrt_notification_backend_show) (const char *title, const char *text) = NULL;
-int (*winrt_notification_backend_init) (void) = NULL;
+int (*winrt_notification_backend_init) (const char **error) = NULL;
 void (*winrt_notification_backend_deinit) (void) = NULL;
 int (*winrt_notification_backend_supported) (void) = NULL;
 
@@ -40,7 +40,7 @@ notification_backend_show (const char *title, const char *text)
 }
 
 int
-notification_backend_init (void)
+notification_backend_init (const char **error)
 {
 	UINT original_error_mode;
 	GModule *module;
@@ -53,6 +53,7 @@ notification_backend_init (void)
 
 	if (module == NULL)
 	{
+		*error = "hcnotifications-winrt not found.";
 		return 0;
 	}
 
@@ -61,7 +62,7 @@ notification_backend_init (void)
 	g_module_symbol (module, "notification_backend_deinit", (gpointer *) &winrt_notification_backend_deinit);
 	g_module_symbol (module, "notification_backend_supported", (gpointer *) &winrt_notification_backend_supported);
 
-	return winrt_notification_backend_init ();
+	return winrt_notification_backend_init (error);
 }
 
 void

src/fe-gtk/notifications/notification-winrt.cpp

@@ -22,6 +22,7 @@
 
 #include <string>
 #include <codecvt>
+#include <strsafe.h>
 
 #include <roapi.h>
 #include <windows.ui.notifications.h>
@@ -38,6 +39,14 @@ widen(const std::string & to_widen)
 	return converter.from_bytes(to_widen);
 }
 
+static std::string
+narrow(const std::wstring & to_narrow)
+{
+	std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
+	return converter.to_bytes(to_narrow);
+}
+
+
 extern "C"
 {
 	__declspec (dllexport) void
@@ -74,13 +83,34 @@ extern "C"
 	}
 
 	__declspec (dllexport) int
-	notification_backend_init (void)
+	notification_backend_init (const char **error)
+	{
+		try
 		{
 			if (!notifier)
 				notifier = ToastNotificationManager::CreateToastNotifier (L"HexChat.Desktop.Notify");
+		}
+		catch (Platform::Exception ^ ex)
+		{
+			static char exc_message[1024];
+			std::string tmp = narrow(std::wstring(ex->Message->Data()));
+			if (SUCCEEDED(StringCchPrintfA(exc_message, _countof(exc_message), "Error (0x%x): %s", ex->HResult, tmp.c_str())))
+				*error = exc_message;
+			else
+				*error = "Exception + error converting exception message.";
+			return 0;
+		}
+		catch (...)
+		{
+			*error = "Generic c++ exception.";
+			return 0;
+		}
 
 		if (FAILED (Windows::Foundation::Initialize (RO_INIT_SINGLETHREADED)))
+		{
+			*error = "Error initializing Windows::Foundation.";
 			return 0;
+		}
 
 		return 1;
 	}

src/fe-gtk/plugin-notification.c

@@ -176,8 +176,13 @@ tray_cmd_cb (char *word[], char *word_eol[], gpointer userdata)
 int
 notification_plugin_init (hexchat_plugin *plugin_handle, char **plugin_name, char **plugin_desc, char **plugin_version, char *arg)
 {
-	if (!notification_backend_init ())
+	const char* error = NULL;
+	if (!notification_backend_init (&error))
+	{
+		if (error)
+			hexchat_printf(plugin_handle, "Failed loading notification plugin: %s\n", error);
 		return 0;
+	}
 
 	ph = plugin_handle;
 	*plugin_name = "";