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database - How to select unique records by SQL

When I perform SELECT * FROM table I got results like below: 1 item1 data1 2 item1 data2 3 item2 data3 4 ... , along with the rest of the unique records. Question&Answers:os...

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

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633 views

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android - Schedule a work on a specific time with WorkManager

WorkManager is a library used to enqueue work that is guaranteed to execute after its constraints are met ... constraint to schedule this work with WorkManager. Question&Answers:os...

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

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479 views

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python - fcntl substitute on Windows

I received a Python project (which happens to be a Django project, if that matters,) that uses the fcntl module ... in the program to make it work on Windows? Question&Answers:os...

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

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winapi - How do I get rid of Python Tkinter root window?

Do you know a smart way to hide or in any other way get rid of the root window that appears, opened ... possible or desirable? Or is there a smarter solution? Question&Answers:os...

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

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244 views

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oop - Why does PHP 5.2+ disallow abstract static class methods?

After enabling strict warnings in PHP 5.2, I saw a load of strict standards warnings from a project that was ... 't be an abstract static function in PHP? Question&Answers:os...

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

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131 views

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c++ - Converting a pointer into an integer

I am trying to adapt an existing code to a 64 bit machine. The main problem is that in one function, the ... machine and as cleanly as possible. Any idea ? Question&Answers:os...

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

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174 views

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python - datetime to string with series in pandas

I need to make this simple thing: dates = p.to_datetime(p.Series(['20010101', '20010331']), format = ' ... . How should I transform from datetime to string? Question&Answers:os...

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

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69 views

1 answer

How to get the MD5 hash of a file in C++?

Closed. This question needs to be more focused. It is not currently accepting answers. Question&Answers:os...

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

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How to get the duration of a video in Python?

I need to get the video duration in Python. The video formats that I need to get are MP4, Flash video, ... hosting solution, so I have no FFmpeg support. Question&Answers:os...

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

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How can I read and manipulate CSV file data in C++?

This question already has answers here: Question&Answers:os...

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

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371 views

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java - How to scroll to the bottom of a RecyclerView? scrollToPosition doesn't work

I'd like to scroll to the bottom of the RecyclerView list after loading the activity. GENERIC_MESSAGE_LIST ... . There are 30 elements in GENERIC_MESSAGE_LIST. Question&Answers:os...

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

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408 views

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Android, canvas: How do I clear (delete contents of) a canvas (= bitmaps), living in a surfaceView?

In order to make a simple game, I used a template that draws a canvas with bitmaps like this: private void ... { mSurfaceHolder.unlockCanvasAndPost(c); } } } } Question&Answers:os...

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

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226 views

1 answer

python - Recursive pattern in regex

This is very much related to Regular Expression to match outer brackets however, I specifically want to know how or ... , this ought to be a cleaner solution. Question&Answers:os...

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

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141 views

1 answer

How do I create a parent-last / child-first ClassLoader in Java, or How to override an old Xerces version that was already loaded in the parent CL?

I would like to create a parent-last / child-first class loader, e.g. a class loader that will look for classes ... . (Perhaps I don't ask the right question) Question&Answers:os...

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

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165 views

1 answer

Javascript: Unicode string to hex

I'm trying to convert a unicode string to a hexadecimal representation in javascript. This is what I have: function ... ideas? Can this be done in javascript? Question&Answers:os...

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

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210 views

1 answer

html - Using "margin: 0 auto;" in Internet Explorer 8

I'm in the process of doing some advance IE8 testing, and it seems that the old technique of using margin: 0 ... ;" center the button, or not, or undefined? Question&Answers:os...

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

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500 views

1 answer

jquery - javascript capture browser shortcuts (ctrl+t/n/w)

Is it possible to capture these shortcuts? Ctrl+N Ctrl+T Ctrl+W I tried this but it doesn't work: ... to capture these shortcuts and prevent any browser action. Question&Answers:os...

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

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131 views

1 answer

c# - Is it possible to bind a Canvas's Children property in XAML?

I'm a little surprised that it is not possible to set up a binding for Canvas.Children through XAML. I've had ... by making the View aware of it's ViewModel. Question&Answers:os...

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

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287 views

1 answer

javascript - How to upload a file using jQuery.ajax and FormData

When I use XMLHttpRequest, a file is correctly uploaded using FormData. However, when I switch to jQuery.ajax, ... file to be uploaded correctly, using AJAX? Question&Answers:os...

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

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312 views

1 answer

How to measure the tilt of the phone in XY plane using accelerometer in Android

I tried to use the Z axis data from SensorEvent.values, but it doesn't detect rotation of my phone in the ... Jump. PS: my phone orientation will be landscape. Question&Answers:os...

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

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323 views

1 answer

asp.net - Return XML from a controller's action in as an ActionResult?

What is the best way to return XML from a controller's action in ASP.NET MVC? There is a nice way to ... the not-best-practice way of Response.Write-ing it? Question&Answers:os...

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

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151 views

1 answer

Reading Properties file in Java

I have the following code trying to read a properties file: Properties prop = new Properties(); ClassLoader ... .main(BaseStation.java:87) thanks, Nikos Question&Answers:os...

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

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88 views

1 answer

javascript - Use anchors with react-router

How can I use react-router, and have a link navigate to a particular place on a particular page? (e.g. /home- ... e.g. using the "hash" prop in <Link>) Question&Answers:os...

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

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210 views

1 answer

Using C++ Class DLL in C# Application

I have an unmanaged C++ DLL which merely exports a single class (not COM...it's just a simple C++ class) ... right way to use this class in my C# application? Question&Answers:os...

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

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155 views

1 answer

javascript - Dynamically arrange some elements around a circle

I'm looking for a function to arrange some elements around a circle. result should be something like : Question&Answers:os...

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

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198 views

1 answer

How to display an image stored as byte array in HTML/JavaScript?

I'm writing a web page in HTML/JavaScript. I'm downloading an image from my backend using AJAX. The image is ... do I display the mentioned image to the user? Question&Answers:os...

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

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208 views

1 answer

c# - Regular Expression to split on spaces unless in quotes

I would like to use the .Net Regex.Split method to split this input string into an array. It must split on ... need? Also do I need to specify any RegexOptions? Question&Answers:os...

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

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208 views

1 answer

iphone - canonical way to randomize an NSArray in Objective-C

Is there a canonical way to randomize an array in Objective-C? Question&Answers:os...

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

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