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MLKitCodeScanner 拓展：离线条码 / 二维码识别 · App Inventor 2 中文网
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Formats
要识别的条码类型，多个用英文逗号分隔，填 all 表示全部（默认）。
可选值：qr、datamatrix、pdf417、aztec、ean13、ean8、upca、upce、code39、code93、code128、itf、codabar。
只勾选实际需要的类型可以显著提升识别速度，例如做...
Is gettimeofday() guaranteed to be of microsecond resolution?
I am porting a game, that was originally written for the Win32 API, to Linux (well, porting the OS X port of the Win32 port to Linux).
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Where to place AutoMapper.CreateMaps?
...t of overhead. I'm not too sure how to design my application to put these calls in just 1 place.
10 Answers
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Converting string from snake_case to CamelCase in Ruby
...equire "active_support/core_ext/string" is suffice, providing Rails is installed already.
– Masa Sakano
Jun 23 '18 at 2:03
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How to get a list of repositories apt-get is checking? [closed]
...y << current.repos.list
Regarding getting repo from a package (installed or available), this will do the trick
apt-cache policy package_name |grep -m1 http| awk '{ print $2 " " $3 }'
However, that will show you the repository of the latest version available of that package, you may have m...
How to install trusted CA certificate on Android device?
I have created my own CA certificate and now I want to install it on my Android Froyo device (HTC Desire Z), so that the device trusts my certificate.
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How to reshape data from long to wide format
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The reshape comments and similar argument names aren't all that helpful. However, I have found that for long to wide, you need to provide data = your data.frame, idvar = the variable that identifies your groups, v.names = the variables that will become multiple columns in wide f...
Equals(=) vs. LIKE
...tify an example where these operators produce obviously different results. Allow me to quote from the MySQL manual:
Per the SQL standard, LIKE performs matching on a per-character basis, thus it can produce results different from the = comparison operator:
mysql> SELECT 'ä' LIKE 'ae' COLLA...
Why do assignment statements return a value?
This is allowed:
14 Answers
14
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Programmatically stop execution of python script? [duplicate]
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You could raise SystemExit(0) instead of going to all the trouble to import sys; sys.exit(0).
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