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c++ - How to set a timeout on blocking sockets in boost asio?

Is there a way to cancel a pending operation (without disconnect) or set a timeout for the boost library functions? I. ... /how-to-set-a-timeout-on-blocking-sockets-in-boost-asio...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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algorithm - Big O notation Log Base 2 or Log Base 10

(This question already has answers here): question from:https://stackoverflow.com/questions/20709267/big-o-notation-log-base-2-or-log-base-10...

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Convert Word doc, docx and Excel xls, xlsx to PDF with PHP

I am looking for a way to convert Word and Excel files to PDF using PHP. The reason for this, is I need to be ... /5538584/convert-word-doc-docx-and-excel-xls-xlsx-to-pdf-with-php...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Oracle ODP.net Managed vs Unmanaged Driver

Are there any performance benchmarks between the managed and unmanaged Oracle ODP.Net drivers? (i.e. is there ... com/questions/17583289/oracle-odp-net-managed-vs-unmanaged-driver...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to pivot in SQLite or i.e. select in wide format a table stored in long format?

I'd like to get a table which stores students data in long format and the marks they receive for all of their subjects in ... -i-e-select-in-wide-format-a-table-stored-in-long-form...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is there a way to hide the vertical ruler in Ace Editor?

Is there a way to hide the vertical ruler in Ace? By vertical ruler I mean the vertical line in the editor at 80 ... /is-there-a-way-to-hide-the-vertical-ruler-in-ace-editor...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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utf 8 - What is a multibyte character set?

Does the term multibyte refer to a charset whose characters can - but don't have to be - wider than 1 ... ://stackoverflow.com/questions/748965/what-is-a-multibyte-character-set...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matlab - How to show legend for only a specific subset of curves in the plotting?

t = 0 : 0.01 : 2 * pi; s = sin(t); c = cos(t); m = -sin(t); hold on; plot(t, s, ' ... com/questions/13685967/how-to-show-legend-for-only-a-specific-subset-of-curves-in-the-plotting...

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c# - Convert an IOrderedEnumerable<KeyValuePair<string, int>> into a Dictionary<string, int>

I was following the answer to another question, and I got: // itemCounter is a ... questions/3066182/convert-an-iorderedenumerablekeyvaluepairstring-int-into-a-dictionarystrin...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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regex - Does the 'o' modifier for Perl regular expressions still provide any benefit?

It used to be considered beneficial to include the 'o' modifier at the end of Perl regular expressions. The ... -o-modifier-for-perl-regular-expressions-still-provide-any-benefit...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - MemoryStream in Using Statement - Do I need to call close()

When using a memory stream in a using statement do I need to call close? For instance is ms.Close() needed ... /11968289/memorystream-in-using-statement-do-i-need-to-call-close...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Lazy sequence generation in Rust

How can I create what other languages call a lazy sequence or a "generator" function? In Python, I can ... ://stackoverflow.com/questions/16421033/lazy-sequence-generation-in-rust...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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matlab - Create an array of strings

Is it possibe to create an array of strings in MATLAB within a for loop? For example, for i=1:10 Names ... :https://stackoverflow.com/questions/7100841/create-an-array-of-strings...

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What is the convention for Lisp filename extension?

".el" is the convention for filename ending with Emacs Lisp programs. What is the convention when writing ... questions/15187240/what-is-the-convention-for-lisp-filename-extension...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - EditText setError() with no message just the icon

Currently I have a really simple code that validates EditText fields and when the user hits the button at the ... /questions/6538709/edittext-seterror-with-no-message-just-the-icon...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is a Cursor in MongoDB?

We are troubled by eventually occurring cursor not found exceptions for some Morphia Queries asList and I've found ... .com/questions/36766956/what-is-a-cursor-in-mongodb...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Assigning to columns in NumPy?

How could the following MATLAB code be written using NumPy? A = zeros(5, 100); x = ones(5,1); A ... from:https://stackoverflow.com/questions/10923212/assigning-to-columns-in-numpy...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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oop - Dynamically mixin a base class to an instance in Python

Is it possible to add a base class to an object instance (not a class!) at runtime? Something along the lines ... /8544983/dynamically-mixin-a-base-class-to-an-instance-in-python...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to access/get the size of an array/collection in velocity templates?

I am using velocity for email templates in my java/spring 3 app. How could I get the size of an ArrayList ... to-access-get-the-size-of-an-array-collection-in-velocity-templates...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Jquery UI autocomplete; minLength:0 issue

I am using a JQuery UI auto-complete. I am specifying the min length. If I specify minLength:2 I ... ://stackoverflow.com/questions/4604216/jquery-ui-autocomplete-minlength0-issue...

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char - C: correct usage of strtok_r

How can I use strtok_r instead of strtok to do this? char *pchE = strtok(NULL, " "); Now I'm trying ... :https://stackoverflow.com/questions/15961253/c-correct-usage-of-strtok-r...

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java - Shared Memory between two JVMs

Is there a way in JAVA, for two JVMs (running on same physical machine), to use/share the same ... https://stackoverflow.com/questions/25396664/shared-memory-between-two-jvms...

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Understanding Rails validation: what does allow_blank do?

I'm quite new to Rails and found a little snippet to validate presence and uniqueness step by step: ... /questions/14488465/understanding-rails-validation-what-does-allow-blank-do...

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mod rewrite - .htaccess: RewriteEngine not allowed here

I uploaded the .htaccess to the server and received an Error 500 (Internal Server Error). And in ... //stackoverflow.com/questions/6995545/htaccess-rewriteengine-not-allowed-here...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Execute Ant task just if a condition is met

I need to execute an Ant task within a specific target only if a condition is met. I found a way to define ... .com/questions/14562904/execute-ant-task-just-if-a-condition-is-met...

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Is is possible to export functions from a C# DLL like in VS C++?

In VS C/C++ you could use extern "C" __declspec(dllexport) -function declaration-. How do I accomplish this in a C# ... possible-to-export-functions-from-a-c-sharp-dll-like-in-vs-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Using python to write mysql query to csv, need to show field names

I have the following: import MySQLdb as dbapi import sys import csv dbServer='localhost' dbPass='supersecretpassword' dbSchema ... write-mysql-query-to-csv-need-to-show-field-names...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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amazon web services - Is there any way to get s3 uri from aws web console?

I want to download a directory from my s3. When I need a file, the s3 management console (aws web console) allows me ... /is-there-any-way-to-get-s3-uri-from-aws-web-console...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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