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FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory in Ionic 3

When I run an Ionic 3 project using the ionic serve command, then I am getting this error: Question&Answers:os...

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

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219 views

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How can I extract a good quality JPEG image from a video file with ffmpeg?

Currently I am using this command to extract the images: ffmpeg -i input.mp4 output_%03d.jpeg But how can I improve the JPEG image quality? 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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c++ - Static variables in member functions

Can someone please explain how static variables in member functions work in C++. Given the following class: class ... code I have seems to indicate otherwise. Question&Answers:os...

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

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277 views

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c - Difference between const & const volatile

If we declare a variable as volatile every time the fresh value is updated If we declare a variable as const then ... happens if we declare as const int temp? Question&Answers:os...

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

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181 views

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debugging - Enumerate or list all variables in a program of [your favorite language here]

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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259 views

1 answer

What does mysql error 1025 (HY000): Error on rename of './foo' (errorno: 150) mean?

I tried this in mysql: mysql> alter table region drop column country_id; And got this: ERROR 1025 (HY000): Error ... (errno: 150) Any ideas? Foreign key stuff? Question&Answers:os...

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

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asp.net - Calling wkhtmltopdf to generate PDF from HTML

I'm attempting to create a PDF file from an HTML file. After looking around a little I've found: wkhtmltopdf to ... pdf files from html, please let me know. Question&Answers:os...

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

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video - Fetch frame count with ffmpeg

Does anyone know how to fetch the number of total frames from a video file using ffmpeg? The render output ... frame count to calculate the progress in percent. Question&Answers:os...

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

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spring - No mapping found for HTTP request with URI [/WEB-INF/pages/apiForm.jsp]

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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ffmpeg for a android (using tutorial: "ffmpeg and Android.mk")

I am trying to compile ffmpeg for a android. I have found several posts on this theme but non of these seems ... -android [3] http://ffmpeg.org/download.html Question&Answers:os...

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

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115 views

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c# - Get properties and values from unknown object

From the world of PHP I have decided to give C# a go. I've had a search but can't seem to find the ... all new to me. Any help would be greatly appreciated. Question&Answers:os...

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

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macos - Rails 3 - can't install pg gem

When I try to run bundle (bundle install), I all the time get Installing pg (0.13.2) with native extensions ... the libpq-dev, how could I install/fix that? Question&Answers:os...

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

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Can I avoid the native fullscreen video player with HTML5 on iPhone or android?

I've built a web app that uses the HTML5 tag and JavaScript code that renders other content synchronized with ... if I could just stick with HTML5/JavaScript. Question&Answers:os...

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

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218 views

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PHP image upload security check list

I am programming a script to upload images to my application. Are the following security steps enough to make the ... "; } Any new tips are welcome :) Question&Answers:os...

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

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114 views

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javascript - how to reset <input type = "file">

I am developing a metro app with VS2012 and Javascript I want to reset the contents of my file input: <input type="file" ... ="image/*" /> How should I do that? Question&Answers:os...

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

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461 views

1 answer

string - PHP equivalent of .NET/Java's toString()

How do I convert the value of a PHP variable to string? I was looking for something better than concatenating with ... the ToString() method in Java or .NET. Question&Answers:os...

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

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281 views

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bash - How to replace ${} placeholders in a text file?

I want to pipe the output of a "template" file into MySQL, the file having variables like ${dbName} ... instances and dump the output to standard output? Question&Answers:os...

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

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250 views

1 answer

Groovy executing shell commands

Groovy adds the execute method to String to make executing shells fairly easy; println "ls".execute().text but if an error ... "out: ${x.out} err:${x.err}" Question&Answers:os...

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

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157 views

1 answer

php - Architecture more suitable for web apps than MVC?

I've been learning Zend and its MVC application structure for my new job, and found that working with it just ... a good fit for web applications, what is? Question&Answers:os...

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

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235 views

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toggleclass - Easiest way to toggle 2 classes in jQuery

If I have class .A and class .B and want to switch in between on button click, what's a nice solution for ... an inline solution to put it in onclick="" event? 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

python - Different ways of clearing lists

Is there any reason to do anything more complicated than one of these two lines when you want to clear a list ... running code: del old_list[ 0:len(old_list) ] Question&Answers:os...

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

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241 views

1 answer

javascript - Pass mouse events through absolutely-positioned element

I'm attempting to capture mouse events on an element with another absolutely-positioned element on top of it. Right ... behind it. How should I implement this? 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

shell - Random number from a range in a Bash Script

I need to generate a random port number between 2000-65000 from a shell script. The problem is $RANDOM is a 15- ... /dev/urandom and getting it within a range? Question&Answers:os...

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

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358 views

1 answer

python - Mac OS X - EnvironmentError: mysql_config not found

First off, yeah, I've already seen this: pip install mysql-python fails with EnvironmentError: mysql_config not found ... Please note I'm not in a virtualenv. Question&Answers:os...

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

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652 views

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javascript - Play an audio file using jQuery when a button is clicked

I am trying to play an audio file when I click the button, but it's not working, my html code is: <html> <body> ... ); }); I have created a Fiddle for that too. Question&Answers:os...

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

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252 views

1 answer

ios - AFNetworking Post Request

I'm a newbie in obj-c and have been using asihttp for some of my projects. When doing a post request in ... giving me some problems. Thanks for help in advance. Question&Answers:os...

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

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200 views

1 answer

javascript - $(document).ready shorthand

Is the following shorthand for $(document).ready? (function($){ //some code })(jQuery); I see this pattern ... it seems to always fire before the ready event. Question&Answers:os...

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

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138 views

1 answer

Git fails when pushing commit to github

I cloned a git repo that I have hosted on github to my laptop. I was able to successfully push a couple of ... finally have to CTRL + C back to the terminal. Question&Answers:os...

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

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