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Send message to specific client with socket.io and node.js

I'm working with socket.io and node.js and until now it seems pretty good, but I don't know how to send a message from the server to an specific client, something like this: ...
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Why is it impossible to build a compiler that can determine if a C++ function will change the value

I read this line in a book: 13 Answers 13 ...
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How to avoid “too many parameters” problem in API design?

... One style embraced in the frameworks is usually like grouping related parameters into related classes (but yet again problematic with mutability): var request = new HttpWebRequest(a, b); var service = new RestService(request, c, d, e); var client = new RestC...
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Internet Explorer 11 detection

I know IE 11 has different user agent string than all other IE 11 Answers 11 ...
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How can I make an EXE file from a Python program? [duplicate]

I've used several modules to make EXEs for Python, but I'm not sure if I'm doing it right. 7 Answers ...
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PHP and MySQL - how to avoid password in source code? [duplicate]

...e / password are hard-coded in the PHP code. A situation I do not really like, for example, since the code is also available in a repository. ...
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Convert seconds value to hours minutes seconds?

...a value of seconds (in a BigDecimal variable) to a string in an editText like "1 hour 22 minutes 33 seconds" or something of the kind. ...
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how to implement a long click listener on a listview

I want to add OnLongClickListener on my list view. Whenever the user long press the item in list some action should be performed, But my code does not catch this listener. Please let me know where I am going wrong. The similar code works for setOnItemClickListener very well. ...
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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 of ffmpeg shows the current frame and I need the frame count to calculate the progress in percent. ...
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Can I initialize a C# attribute with an array or other variable number of arguments?

... Attributes will take an array. Though if you control the attribute, you can also use params instead (which is nicer to consumers, IMO): class MyCustomAttribute : Attribute { public int[] Values { get; set; } public MyCustomAttribute(...