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In Go, how to import function directly, without need to prefix with the package name when I call it?

In the Go programming language, why after importing a package do I still have to prefix a method within that ... -import-function-directly-without-need-to-prefix-with-the-package...

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

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How to check if a pointer is freed already in C?

I would like to check if a pointer is freed already or not. How do I do this using gnu compiler set? question from ... /8300853/how-to-check-if-a-pointer-is-freed-already-in-c...

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

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ruby - Rails: Validate only on create, or on update when field is not blank

How can I restrict a Rails validation to check only on create OR when the field isn't blank? I'm creating a user ... -validate-only-on-create-or-on-update-when-field-is-not-blank...

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

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node.js - how to fix this error TypeError [ERR_INVALID_CALLBACK]: Callback must be a function

I am a beginner to the nodejs. When I type the below, the code error occurs like this: TypeError [ ... this-error-typeerror-err-invalid-callback-callback-must-be-a-funct...

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

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NGINX cache static files

I'm having some trouble defining a rule to cache my static files. I've found this solution: location ~ ... :https://stackoverflow.com/questions/19515132/nginx-cache-static-files...

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

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android - Error:Execution failed for task ':app:kaptDebugKotlin'

I'm new to using Kotlin and trying to set it up with Dagger2, I've seen some few ... ://stackoverflow.com/questions/46850060/errorexecution-failed-for-task-appkaptdebugkotlin...

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

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Debug c++ dll in C#

I have a .dll from c++ and I want to debug it in C#, but I don't know how to. When I compiled ... question from:https://stackoverflow.com/questions/1062910/debug-c-dll-in-c-sharp...

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

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sql - How to give a unique constraint to a combination of columns in Oracle?

I have a Table with 4 Columns Each Column will be A,B,C,D Column A is the Primary key. Column B has unique ... how-to-give-a-unique-constraint-to-a-combination-of-columns-in-oracle...

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

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javascript - nodeJS exec does not work for "cd " shell cmd

var sys = require('sys'), exec = require('child_process').exec; exec("cd /home/ubuntu/distro", function(err, ... .com/questions/15629923/nodejs-exec-does-not-work-for-cd-shell-cmd...

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

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android - Does Retrofit make network calls on main thread?

I am trying to explore Retrofit+OkHttp on Android. Here's some code I found online : RestAdapter restAdapter ... questions/21006807/does-retrofit-make-network-calls-on-main-thread...

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

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centos - Mounting nfs shares inside docker container

Does anyone know how to mount nfs share inside docker container with centos base image? I've tried ... .com/questions/39922161/mounting-nfs-shares-inside-docker-container...

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

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html - Why my inline-block divs are not aligned when only one of them has text?

(This question already has answers here): question from:https://stackoverflow.com/questions/13548168/why-my-inline-block-divs-are-not-aligned-when-only-one-of-them-has-text...

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

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python - Scope of variable within "with" statement?

I am reading only firstline from python using : with open(file_path, 'r') as f: my_count = f. ... //stackoverflow.com/questions/45100271/scope-of-variable-within-with-statement...

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

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java - Maven Surefire plugin "Error occured in starting fork, check output in log"

I get the following error BUILD ERROR Error occured in starting fork, check output in log when using Maven 2. ... surefire-plugin-error-occured-in-starting-fork-check-output-in-log...

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

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javascript - XMLHttpRequest blocked by CORS Policy

I add an API with following script in let's say http://www.test.com: <script src="http:// ... :https://stackoverflow.com/questions/46277295/xmlhttprequest-blocked-by-cors-policy...

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

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c# - Best way in .NET to manage queue of tasks on a separate (single) thread

I know that asynchronous programming has seen a lot of changes over the years. I'm somewhat embarrassed that I let ... -net-to-manage-queue-of-tasks-on-a-separate-single-thread...

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

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php - Laravel Database Schema, Nullable Foreign

I've these two database tables: User Tables Partner Tables User Tables will handle this kind of ... /stackoverflow.com/questions/37735055/laravel-database-schema-nullable-foreign...

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javascript - How to get Mocha to fail a test

I have the following test: it.only('validation should fail', function(done) { var body = { title: " ... .com/questions/30874676/how-to-get-mocha-to-fail-a-test...

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

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c++ - how to compare two std::set?

I do such comparison of two std::set #include <cstdlib> #include <cstdio> using namespace std; #include < ... ://stackoverflow.com/questions/16182958/how-to-compare-two-stdset...

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

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Linux script with curl to check webservice is up

I have a webservice provided at http://localhost/test/testweb I want to write a script to check if webservice ... /12747929/linux-script-with-curl-to-check-webservice-is-up...

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

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internet explorer - Save base64 string as PDF at client side with JavaScript

So here my problem: I have a pdf file as a base64 String that i am getting from the server. I would ... questions/11415665/save-base64-string-as-pdf-at-client-side-with-javascript...

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

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android - Optional permissions so an app can show on all devices and enable optional features on some?

Many features in Android require a uses-permission to be set in the manifest. These values then determine what devices ... an-app-can-show-on-all-devices-and-enable-optional-featu...

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How to edit or write on existing PDF with Ruby?

I have a couple of PDF template files with complex content and several blank regions/areas in them. I need to be ... /9185942/how-to-edit-or-write-on-existing-pdf-with-ruby...

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

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How to deploy an HTTPS-only site, with Django/nginx?

My original question was how to enable HTTPS for a Django login page, and the only response, recommended that I - ... /8153875/how-to-deploy-an-https-only-site-with-django-nginx...

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

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asp.net mvc 3 - How do I set a checkbox in razor view?

I need to check a checkbox by default: I tried all of these, nothing is checking my checkbox - @Html.CheckBoxFor(m = ... com/questions/6157293/how-do-i-set-a-checkbox-in-razor-view...

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

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c# - How to get current property name via reflection?

I would like to get property name when I'm in it via reflection mechanism. Is it possible? Update: I have ... .com/questions/1206023/how-to-get-current-property-name-via-reflection...

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

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javascript - Do not collect Zip code with Stripe

Im trying to use Stripe v3 for payment. The guide is here https://stripe.com/docs/elements I do not ... /stackoverflow.com/questions/46863072/do-not-collect-zip-code-with-stripe...

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

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converting a variable name to a string in C++

I'd like to output some data to a file. For example assume I have two vectors of doubles: vector<double> data1 ... com/questions/3386861/converting-a-variable-name-to-a-string-in-c...

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

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