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问题 I am trying to practice my binding. I want to make a window with two spinners and just get them to show the same value. The problem is that the binding is unreliable: the spinners seem to stop updating each other if they are clicked too fast. Both spinners still respond to clicking, and clicks are counted correctly on the spinner being clicked, but the other spinner stops updating and never recovers. And it doesn’t have to be very fast clicking at all to cause it. My code is based on this

问题 I am attempting to make an application that reads text messages. The application works fine, when I get a text message, the message is displayed in a toast along with the phone number. The problem is, even with the application closed, ie not in the foreground, it still shows the toast when I get a text message. I have used a task killer application, and it still shows the toast. The only way to not show the toast is to unistall the application. I am using this website as a tutorial http://www

问题 Why doesn't defining a variable with auto keyword carry the constexpr 'ness of the expression used to initialize it? As an example, consider the following code: #include <string_view> constexpr std::string_view f() { return "hello"; } static constexpr std::string_view g() { constexpr auto x = f(); // (*) return x.substr(1, 3); } int foo() { return g().length(); } With GCC 10.2 and --std=c++20 -fsanitize=undefined -O3 , this compiles into: foo(): mov eax, 3 ret But if we remove the constexpr

问题 My app was converted from a non-document-based app to a document-based one. I did that by creating a subclass of NSDocument , called Document . I also created a Document.xib and set its "File's Owner" to Document . Now in Document.xib , I can see there is a window outlet in its "File's Owner". I don't have a window outlet defined in Document . Where does it come from? I guess it is from the super class NSDocument , but I have no access to that variable in Document . What's up with this weird

问题 i am working on a react.js project which authenticate from firebase but i have 3 multiple type of user's in it (super Admin,vendor admin,vendor staff) with different privileges. how can i authenticate them from firebase and get to know this is my venor admin or vendor staff etc ???? because firebase just authenticate single type of user! 回答1: You can control access via custom claims using the Firebase Admin SDK on your own server of through Cloud Functions for Firebase. Set claims server side

问题 I have a dataframe as follows Name Age 0 Tom 20 1 nick 21 2 3 krish 19 4 jack 18 5 6 jill 26 7 nick Desired output is Name Age 0 Tom 20 1 nick 21 3 krish 19 4 jack 18 6 jill 26 7 nick The index should not be changed and if possible would be nice if I don't have to convert empty strings to NaN. It should be removed only if all the columns have '' empty strings 回答1: You can do: # df.eq('') compare every cell of `df` to `''` # .all(1) or .all(axis=1) checks if all cells on rows are True # ~ is

问题 If I define CapacityScheduler Queues in yarn as explained here http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html how do I make spark use this? I want to run spark jobs... but they should not take up all the cluster but instead execute on a CapacityScheduler which has a fixed set of resources allocated to it. Is that possible ... specifically on the cloudera platform (given that spark on cloudera runs on yarn?). 回答1: You should configure the

问题 Python code is taking around 2-3 secs to make the snowflake database connection. Is it expected behaviour ? OR are there any parameters which will speed up connection time. Here is the sample code: import snowflake.connector import time t1=time.time() print("Start time :"+str(t1)) try: conn = snowflake.connector.connect( user=user, password=password, account=account, warehouse=warehouse, # database=DATABASE, # schema=SCHEMA ) cur = conn.cursor() except Exception as e: logging.error(

问题 So trying to build OpenPose from source, and was running into a linking problem. Current environment is Ubuntu 16.04.4. OpenCV version is 3.3.1. GCC version is 5.4.0. [ 87%] Built target openpose [ 87%] Linking CXX executable 1_extract_from_image.bin [ 87%] Linking CXX executable openpose.bin [ 87%] Linking CXX executable 3_user_input_processing_and_output.bin [ 87%] Linking CXX executable 2_extract_pose_or_heatmat_from_image.bin [ 87%] Linking CXX executable 1_custom_post_processing.bin [ 87

问题 I have inherited an application with database. The database has following tables related to authentication and authorization. User Table UserName Password UserTypeId UserType Table UserTypeId UserTypeDesc The User Type table stores the roles for the user e.g. Admin, Editor, etc. If I want to implement authorization like below [Authorize(Roles="Admin, Editor")] public IHttpActionResult GetOrders() { //Code here } Where and what should I code so that the roles are available to the authorize