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rust - Can I use the "null pointer optimization" for my own non-pointer types?

When you have an Option<&T>, the compiler knows that NULL is never a possible value for &T, and encodes the ... as None. Is this possible? See Question&Answers more detail:os...

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

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cocoa - Remove Sandboxing

I have another question dealing with app sandboxing. So I need access to the users' home directory and at the ... ? Thanks for your help! See Question&Answers more detail:os...

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

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642 views

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javascript - mousewheel event is not triggering in firefox browser

Please refer the below code. $(this.element).on("mousewheel", this.chartMouseWheel); chartMouseWheel:function(e) ... not triggering in Firefox ? See Question&Answers more detail:os...

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

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MySQL - Select the last inserted row easiest way

I simply need to select the last entered row specified by condition, e.g: SELECT ID from bugs WHERE user=Me I ... way to do this? Thank you. See Question&Answers more detail:os...

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

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Logstash: how to add file name as a field?

I'm using Logstash + Elasticsearch + Kibana to have an overview of my Tomcat log files. For each log entry I ... file name. Any better ideas? See Question&Answers more detail:os...

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

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php - Can I get the value of a private property with Reflection?

It doesn't seem to work: $ref = new ReflectionObject($obj); if($ref->hasProperty('privateProperty')){ print_r ... access a private property lol? See Question&Answers more detail:os...

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

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c# - Is Int32.ToString() culture-specific?

I'm running a beta version of ReSharper, and it's giving me warnings for the following code: int id; // .. ... 'll file a ReSharper bug report)? See Question&Answers more detail:os...

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

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c# - How to ignore the case sensitivity in List<string>

Let us say I have this code string seachKeyword = ""; List<string> sl = new List<string>(); sl.Add( ... letter case in Contains search? Thanks, See Question&Answers more detail:os...

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

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oop - C# : Converting Base Class to Child Class

I have a class, NetworkClient as a base class : using System.IO; using System.Net.Sockets; using System. ... be converted to Skyfilter Client? See Question&Answers more detail:os...

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

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c# - What does Collection.Contains() use to check for existing objects?

I have a strongly typed list of custom objects, MyObject, which has a property Id, along with some other ... something first, is that right? See Question&Answers more detail:os...

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

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Base64: java.lang.IllegalArgumentException: Illegal character

I'm trying to send a confirmation email after user registration. I'm using the JavaMail library for this ... to Jon Skeet and ByteHamster. See Question&Answers more detail:os...

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

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language agnostic - Is Sleep() evil?

First of all, there are many cases where Sleep() is misused, for example to "synchronize" threads or to regularily ... to be avoided like goto. See Question&Answers more detail:os...

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

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c++ - Is std::pair<int, std::string> ordering well-defined?

It seems that I can sort a std::vector<std::pair<int, std::string>>, and it will sort based on the ... a default ordering based on its elements? See Question&Answers more detail:os...

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

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javascript - Jquery execute onchange event on onload

I have a function that on change event run the post actions. $("select#marca").change(function(){ var marca = $( ... a good way to do this? See Question&Answers more detail:os...

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

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C# : changing listbox row color?

I am trying to change the background color of some rows in a ListBox. I have two lists that one has names and ... in red. Where is my mistake? See Question&Answers more detail:os...

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

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381 views

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filestream - C equivalent to fstream's peek

I know in C++, you're able to peek at the next character by using: in.peek();. How would I go about this ... the next character of a file in C? See Question&Answers more detail:os...

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

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timer - Fortran intrinsic timing routines, which is better? cpu_time or system_clock

When timing a FORTRAN program i usually just use the command call cpu_time(t). Then i stumbled across call ... 348s Thanks for reading... See Question&Answers more detail:os...

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

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397 views

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linux - Accessing a mysql database from external host/ip? (ie: mysql workbench)

I have a mysql server running on x.x.x.x, and can access it internally no problem (of course). ... fundamental security issue I am missing? See Question&Answers more detail:os...

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

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210 views

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android - startActivityForResult from ActivityGroup?

I can't seem to get ANY result when trying to start an activity from an activitygroup. I've put an ... (pickMedia,12345); Any ideas? See Question&Answers more detail:os...

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

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overloading method priority in java

I know that this problem discussed many times but I don't understand anyway. Research this code: public class Main { ... I see int ... why? See Question&Answers more detail:os...

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

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260 views

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How to generate unique DICOM UID?

I am working on DICOM gated (PET) data. I would like to artificially create a DICOM image series which ... how these values are written? See Question&Answers more detail:os...

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

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308 views

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asp.net - How to combine using Membership API with own application related data?

Designing a new application in asp.net 4 I have to make a decision how to use a MS SQL Membership API along ... Provider? Thank you in advance. See Question&Answers more detail:os...

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

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How make one event handler that applies to multiple controls in C#?

In Visual Basic I knew how to do it, but I'm new to C#, so can you guys tell me how do I make a "private ... , EventArgs e) { btn.Image = pic } See Question&Answers more detail:os...

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

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javascript - IE's document.selection.createRange doesn't include leading or trailing blank lines

I'm trying to extract the exact selection and cursor location from a textarea. As usual, what's easy in most ... there's not an easier way. See Question&Answers more detail:os...

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

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javascript - How do i take picture from client side(html) and save it to server side(Python)

I'm new to python i did one application using python in that i want to capture Images from my webcam using html and ... /script> </body> </html> See Question&Answers more detail:os...

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

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221 views

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Download File - VB6

Does anyone know how to download a file (without opening a webpage), and save it to a directory in Visual Basic 6.0? See Question&Answers more detail:os...

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

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242 views

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html - How to change the color of <div> Element depending on its height or width?

So what i wanna do is change the Color of an div Element depending on its height. For example: If the div ... using css (if this is possible) See Question&Answers more detail:os...

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

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548 views

1 answer

wpf custom button best approach

I want to create a custom Button inside WPF. Of course, the button will be an UserControl and it will contain many ... . What do you guys think? See Question&Answers more detail:os...

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

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