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How to get available wifi networks and display them in a list in android

Friends, I want to find all available WiFi networks and display them in a list I have tried as below. But it's not ... " "); } mainText.setText(sb); } } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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performance - Is there any guarantee of alignment of address return by C++'s new operation?

Most of experienced programmer knows data alignment is important for program's performance. I have seen some programmer wrote ... myself, if not, I have to. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Remove objects with duplicate properties from Swift array

The question here involves removing duplicate objects from an array: Removing duplicate elements from an array in Swift I ... { posts.removeObject(post2) } } } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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scala - Dropping a nested column from Spark DataFrame

I have a DataFrame with the schema root |-- label: string (nullable = true) |-- features: struct (nullable = ... much sense to do so. Thanks in advance, Nikhil Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Cannot use geometry manager pack inside

So I'm making an rss reader using the tkinter library, and in one of my methods I create a text widget. It ... ", expand=False) Any ideas how to fix this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Replace nth occurrence of substring in string

I want to replace the n'th occurrence of a substring in a string. There's got to be something equivalent ... want as simple as possible and not regex solution. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I generate nested json objects using mysql native json functions?

Using only the native JSON fuctions (no PHP, etc) in MySQL version 5.7.12 (section 13.16 in the manual) ... Error Code: 1242. Subquery returns more than 1 row Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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angular - Ionic 2 Form goes up when keyboard shows

I am using latest version of ionic 2. My code has a <ion-content padding><form></form></ion-content> with a ... /button> </ion-content> is there any solutions ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - How to read xml file contents in jQuery and display in html elements?

I am new to Jquery.I am trying to read data from "sampleXML.xml" file and display that data in Html "li" ... 'm making mistake . . thanks in advance . . Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Flattening a list recursively

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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opencv - How to reduce number of classes in YOLOv3 files?

I am using YOLOv3 to detect cars in videos. I downloaded three files used in my code coco.names, yolov3.cfg ... . Can anyone help me in modifying these files? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Not all parameters were used in the SQL statement (Python, MySQL)

I get an error on the following Python code: import mysql.connector cnx = mysql.connector.connect(user='root', ... in the SQL statement Do you understand why? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Why does console.log say undefined, and then the correct value?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - Accessing Class Properties with Spaces

stdClass Object ([Sector] => Manufacturing [Date Found] => 2010-05-03 08:15:19) So I can access [Sector] by ... ->Sector but how can I access [Date Found] ? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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language design - Why don't PHP attributes allow functions?

I'm pretty new to PHP, but I've been programming in similar languages for years. I was flummoxed by the ... " or sloppy implementation? What's the rationale? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Calling super super class method

Let's say I have three classes A, B and C. B extends A C extends B All have a public void foo() method ... but it's invalid syntax. How can I achieve this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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297 views

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java - Cannot create JDBC driver of class ' ' for connect URL 'null' : I do not understand this exception

Why does it say null URL and gives a empty ' ' class in the exception when I have provided the database ... .jdbc.ClientDriver but I get the same exception. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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535 views

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python - Query Mongodb on month, day, year... of a datetime

I'm using mongodb and I store datetime in my database in this way for a date "17-11-2011 18:00" I store: date ... " : day}) anyone knows how to do this query? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - Constraint for only one record marked as default

How could I set a constraint on a table so that only one of the records has its isDefault bit field set to 1 ... default per set of rows, specified by a FormID. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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242 views

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Count unique values in a column in Excel

I have an .xls file with a column with some data. How do I count how many unique values contains this column? I ... , COUNTIF(List, "<"&List)+1, 0)) returns Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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267 views

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javascript - fetch resolves even if 404?

Using this code : fetch('notExists') // <---- notice .then( function(response) { alert(response.status) } ) ... ). BTW , jquery request , does get rejected Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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312 views

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PHP, display image with Header()

I'm displaying images from outside my web root, like this: header('Content-type:image/png'); readfile( ... are displayed successfully. does anyone know why? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - KeyListener, keyPressed versus keyTyped

I have a JFrame (well, a class which extends JFrame) and I want to do an action when I press the F5 key. ... arg0) { // TODO Auto-generated method stub } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Scope of variables in if statements

I have a class that has no default constructor or assignment operator so it is declared and initialized within an ... and create the appropriate type with new. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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r - Replace negative values by zero

We want to set all values in an array zero that are negative. I tried out a a lot of stuff but did ... 0} else{pred_precipitation[i] = pred_precipitation[i]} } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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350 views

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javascript - Download Canvas as PNG in fabric.js giving network Error

I want to download Canvas as PNG using fabric.js. While downloading I want to scale the image. So I use multiplier ... = "helloWorld.png"; link.click(); } Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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60 views

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C++ function to count all the words in a string

I was asked this during an interview and apparently it's an easy question but it wasn't and still isn't ... a more clever solution? Am I missing something? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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121 views

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How to parsing JSON object in iPhone SDK (XCode) using JSON-Framework

I have JSON object like this : { "data": {"array": ["2", {"array": [ {"clientId":"1","clientName":" ... JSON-Framework. Do you have any idea how to do that? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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