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Camera 扩展：相机拍照和录像，程序控制拍照、自动拍照实现，而无需点击系...
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属性
IsRecording 正在录制 {:.boolean .read-only}
返回当前是否正在录制视频。
IsCameraActive 相机已激活 {:.boolean .read-only}
返回相机是否已启动并激活。
CameraFacing 相机朝向 {:.text .read-only}
返回当前相机的朝...
Read password from stdin
... });
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UnboundLocalError on local variable when reassigned after first use
...nd parsing.
Consider how the parse of this line of code works. The lexer reads the source text and breaks it into lexemes, the "smallest components" of the grammar. So when it hits the line
c+=1
it breaks it up into something like
SYMBOL(c) OPERATOR(+=) DIGIT(1)
The parser eventually wants ...
Virtual Memory Usage from Java under Linux, too much memory used
...ory-map a JAR, you can access the files within it very efficiently (versus reading it from the start each time). The Sun JVM will memory-map all JARs on the classpath; if your application code needs to access a JAR, you can also memory-map it.
Per-thread data for two threads. The 1M block is the thr...
Jquery - How to make $.post() use contentType=application/json?
... anyKey: "anyvalue and type" } will be application/json. Many servers that read json, will only allow an object or array, not a string--thus why jquery predicts things this way. If you have a server that reads strings, numbers, etc without being wrapped in an object, you must specify the content-typ...
How to force file download with PHP
...
Read the docs about built-in PHP function readfile
$file_url = 'http://www.myremoteserver.com/file.exe';
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary");
header("Content-disposi...
LINQ to read XML
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Why use the params keyword?
...e) [] {} to Calls where it doesn't apply.
Btw, imho, the safest (and most readable practice) is to:
pass via Named Parameters (which we can now do even in C# ~2 decades after we could in VB ;P) (because:
1.1. it's the only way that guarantees prevention of unintended values passed to Parameter...
MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...用如下命令查看：
mysql> SHOW SLAVE STATUS;
Master_Log_File & Read_Master_Log_Pos：下一个传输的主日志信息。
Relay_Master_Log_File & Exec_Master_Log_Pos：下一个执行的主日志信息。
Relay_Log_File & Relay_Log_Pos：下一个执行的中继日志信息。
理...
Making macOS Installer Packages which are Developer ID ready
...he Distribution.xml you can change things like title, background, welcome, readme, license, and so on. You turn your component packages and distribution definition with this command into a product archive:
$ productbuild --distribution ./Distribution.xml \
--package-path . \
./Installer.pkg...