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java - Android: Switch camera when button clicked

I have a method called switchCamera, I'm trying to switch camera from front to back on the click of a button, in ... catch block e.printStackTrace(); } } } } Question&Answers:os...

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

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c++ - Are C++17 Parallel Algorithms implemented already?

I was trying to play around with the new parallel library features proposed in the C++17 standard, but I ... . Is there anything we can use already? Question&Answers:os...

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

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c# - Cannot close Excel.exe after Interop process

I'm having an issue with Excel Interop. The Excel.exe doesn't close even if when I realease instances. Here is my ... nothing. How can I fix this? Thank you. Question&Answers:os...

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

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.net - Best HashTag Regex

I'm trying to find all the hash tags in a string. The hashtags are from a stream like twitter, they could be ... #w+ Is this the best regex for this purpose? Question&Answers:os...

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

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iphone - How to disable iOS System Sounds

I am working on an iPad app that connects with an accessory that plays sound. When the iPad is connected to ... 's even possible it could damage equipment. :D Question&Answers:os...

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

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bash - Check if a file is executable

I am wondering what's the easiest way to check if a program is executable with bash, without executing it ? It should ... 32 bits, ...) as the current system. Question&Answers:os...

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

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HTML/CSS - Best practice for preserving white space on certain elements?

What is the best way to preserve white space in HTML? We have a lot of pages that bring down data ... assigning a class to each individual HTML element. Question&Answers:os...

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

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c# - String format currency

I have this line @String.Format("{0:C}", @price) in my razor view. I want it to display a dollar sign in ... it display a pound sign. How do I achieve this? Question&Answers:os...

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

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c# - How to call generic method with a given Type object?

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

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python - How to extract parameters from a list and pass them to a function call

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

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How to use type hints in python 3.6?

I noticed Python 3.5 and Python 3.6 added a lot of features about static type checking, so I tried with the ... 3.6 to achieve the two points I said above. Question&Answers:os...

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

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c# - Error in Process.Start() -- The system cannot find the file specified

I am using the following code to fire the iexplore process. This is done in a simple console app. public ... is throwing this error. Can someone please explain? Question&Answers:os...

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

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Is this the best way to rewrite the content of a file in Java?

I want to rewrite the contents of a file. What I have thought of so far is this: Save the file name ... delete and create files, but simply change the content? Question&Answers:os...

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

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hardware - What are the ascii values of up down left right?

What are the ASCII values of the arrow keys? (up/down/left/right) Question&Answers:os...

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

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c# - File access error with FileSystemWatcher when multiple files are added to a directory

I am running into an issue with a FileSystemWatcher when multiple files are placed into the watched directory. I want ... that gets to the file first parses it. Question&Answers:os...

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

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java - Compile and execute a JDK preview feature with Maven

With JDK/12 EarlyAccess Build 10, the JEP-325 Switch Expressions has been integrated as a preview feature in the ... can one try out this feature using Maven? Question&Answers:os...

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

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Accessing a JSON object in Bash - associative array / list / another model

I have a Bash script which gets data in JSON, I want to be able to convert the JSON into an accessible ... ]} [ Different approach is optional as well. ] Question&Answers:os...

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

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c - How are variable arguments implemented in gcc?

int max(int n, ...) I am using cdecl calling convention where the caller cleans up the variable after the ... array of arguments as the second argument to max? Question&Answers:os...

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

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ios - How can i get the name of image picked through photo library in iphone?

I am picking an image from photo library in iphone application. How will i retrieve the actual image name. in . ... iphone. Please help me. Thanks in advance. Question&Answers:os...

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

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java - Returning a ResultSet

I am trying to create a method from where I can query my database and retrieve a whole table. Currently, it works just ... .getMessage(), ex); } } return rs; } Question&Answers:os...

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

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100 views

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php - How to partially download a remote file with cURL?

Is it possible to partially download a remote file with cURL? Let's say, the actual filesize of the remote file is ... can I download only first 500 KB of it? Question&Answers:os...

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

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333 views

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Hash Table/Associative Array in VBA

I can't seem to find the documentation explaining how to create a hash table or associative array in VBA. Is it ... to an article or better yet post the code? Question&Answers:os...

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

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Defining "boolness" of a class in python

Why doesn't this work as one may have naively expected? class Foo(object): def __init__(self): self.bar = 3 def ... x' else: print 'y' (The output is x) Question&Answers:os...

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

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396 views

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css - What is the difference between px, em and ex?

What is the difference between px, em and ex? And when you define font-size in CSS, do you use px, pt or em? Question&Answers:os...

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

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190 views

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windows - Java_home in Maven

When I ran mvn -version, I noticed the java_home points to ...jdkjre (as shown below). Is that wrong? Isn't it ... : "6.1" arch: "amd64" Family: "windows" Question&Answers:os...

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

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CSS Best Practice about ID and Class?

I've been dipping into SitePoint book concerning CSS. The thing that struck me about the examples was the use of ID ... here to use CLASS or ID as the selector? Question&Answers:os...

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

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152 views

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r - In `knitr` how can I test for if the output will be PDF or word?

I would like to include specific content based on which format is being created. In this specific example, my tables ... be the correct way to test for this? Question&Answers:os...

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

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java - Performance difference between a wild card import and the required class import

What is the complexity in terms of performance between java.io.* and java.io.File PS. I know that the first ... and the next one only the selected class file. Question&Answers:os...

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

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