Fix when using Facebook Menu to log out in a FeedDialog (the www.facebook.com/logout.php is called but the token wasn't deleted).

samples/LoginCpp-UWP/LoginCpp/Dialogs.xaml.cpp

@@ -137,16 +137,24 @@ void Dialogs::Feed_Click(
     )
 {
     FBSession^ s = FBSession::ActiveSession;
-    PropertySet^ params = ref new PropertySet();
-    params->Insert(L"caption", L"I love Brussels Sprouts!");
-    params->Insert(L"link", L"https://en.wikipedia.org/wiki/Brussels_sprout");
-    params->Insert(L"description", L"Om Nom Nom!");
 
-    create_task(s->ShowFeedDialogAsync(params))
-        .then([=](FBResult^ DialogResponse)
-    {
-        OutputDebugString(L"Showed 'Feed' dialog.\n");
-    });
+	if (s->AccessTokenData == nullptr)
+	{
+		OutputDebugString(L"User is not logged (access token was deleted).\n");
+	}
+	else
+	{
+		PropertySet^ params = ref new PropertySet();
+		params->Insert(L"caption", L"I love Brussels Sprouts!");
+		params->Insert(L"link", L"https://en.wikipedia.org/wiki/Brussels_sprout");
+		params->Insert(L"description", L"Om Nom Nom!");
+
+		create_task(s->ShowFeedDialogAsync(params))
+			.then([=](FBResult^ DialogResponse)
+		{
+			OutputDebugString(L"Showed 'Feed' dialog.\n");
+		});
+	}
 }
 
 
@@ -156,14 +164,22 @@ void Dialogs::AppRequests_Click(
     )
 {
     FBSession^ s = FBSession::ActiveSession;
-    PropertySet^ params = ref new PropertySet();
 
-    params->Insert(L"title", L"I love Brussels Sprouts!");
-    params->Insert(L"message", L"Om Nom Nom!");
+	if (s->AccessTokenData == nullptr)
+	{
+		OutputDebugString(L"User is not logged (access token was deleted).\n");
+	}
+	else
+	{
+		PropertySet^ params = ref new PropertySet();
 
-    create_task(s->ShowRequestsDialogAsync(params))
-        .then([=](FBResult^ DialogResponse)
-    {
-        OutputDebugString(L"Showed 'Requests' dialog.\n");
-    });
+		params->Insert(L"title", L"I love Brussels Sprouts!");
+		params->Insert(L"message", L"Om Nom Nom!");
+
+		create_task(s->ShowRequestsDialogAsync(params))
+			.then([=](FBResult^ DialogResponse)
+		{
+			OutputDebugString(L"Showed 'Requests' dialog.\n");
+		});
+	}
 }

winsdkfb/winsdkfb/winsdkfb.Shared/FacebookDialog.xaml.cpp

@@ -55,6 +55,7 @@ using namespace std;
 #define FACEBOOK_DESKTOP_SERVER_NAME L"www"
 #define FACEBOOK_MOBILE_SERVER_NAME  L"m"
 #define FACEBOOK_LOGIN_SUCCESS_PATH  L"/connect/login_success.html"
+#define FACEBOOK_LOGOUT_PATH  L"/logout.php"
 #define FACEBOOK_DIALOG_CLOSE_PATH   L"/dialog/close"
 
 const wchar_t* ErrorObjectJson = L"{\"error\": {\"message\": " \
@@ -399,6 +400,13 @@ bool FacebookDialog::IsLoginSuccessRedirect(
     return (String::CompareOrdinal(Response->Path, FACEBOOK_LOGIN_SUCCESS_PATH) == 0);
 }
 
+bool FacebookDialog::IsLogoutRedirect(
+	Uri^ Response
+	)
+{
+	return (String::CompareOrdinal(Response->Path, FACEBOOK_LOGOUT_PATH) == 0);
+}
+
 bool FacebookDialog::IsDialogCloseRedirect(
     Uri^ Response
     )
@@ -463,6 +471,17 @@ void FacebookDialog::dialogWebView_FeedNavStarting(
             _dialogResponse = ref new FBResult(err);
         }
     }
+	else if (IsLogoutRedirect(e->Uri))
+	{
+		UninitDialog();
+
+		DebugPrintLine(L"Feed response is " + e->Uri->DisplayUri);
+		FBSession^ sess = FBSession::ActiveSession;
+		sess->LogoutAsync();
+
+		FBError^ err = FBError::FromJson(ref new String(ErrorObjectJson));
+		_dialogResponse = ref new FBResult(err);
+	}
     else if (IsDialogCloseRedirect(e->Uri))
     {
         UninitDialog();

winsdkfb/winsdkfb/winsdkfb.Shared/FacebookDialog.xaml.h

@@ -128,6 +128,10 @@ namespace winsdkfb
             Windows::Foundation::Uri^ Response
             );
 
+		bool IsLogoutRedirect(
+			Windows::Foundation::Uri^ Response
+			);
+
         bool IsDialogCloseRedirect(
             Windows::Foundation::Uri^ Response
             );