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导盲项目：什么场景非得用相机预览？按杖上按钮或定时拍照，识别后语音提醒...
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关键属性
垂直布局
垂直布局_预览
宽「充满」、高 120 像素；里面不要放别的组件（初始化预览会清空它）
实时预览录制
实时预览录制1
「后台录制」不勾、「使用前置摄像...
Best way to parse command-line parameters? [closed]
What's the best way to parse command-line parameters in Scala?
I personally prefer something lightweight that does not require external jar.
...
Case insensitive string compare in LINQ-to-SQL
... accurate when you're trying to do case insensitive equality checks.
Ideally, the best way to do a case-insensitive equality check would be:
String.Equals(row.Name, "test", StringComparison.OrdinalIgnoreCase)
NOTE, HOWEVER that this does not work in this case! Therefore we are stuck with ToUpp...
Collection that allows only unique items in .NET?
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If all you need is to ensure uniqueness of elements, then HashSet is what you need.
What do you mean when you say "just a set implementation"? A set is (by definition) a collection of unique elements that doesn't save element ...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ble来管理全局变量的，Lua把这些全局变量放在了一个叫“_G”的Table里。
我们可以用如下的方式来访问一个全局变量（假设我们这个全局变量名叫globalVar）：
1
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_G.globalVar
_G["globalVar"]
我们可...
How to refer to relative paths of resources when working with a code repository
...Try to use a filename relative to the current files path. Example for './my_file':
fn = os.path.join(os.path.dirname(__file__), 'my_file')
In Python 3.4+ you can also use pathlib:
fn = pathlib.Path(__file__).parent / 'my_file'
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How to deep copy a list?
... don't make a deep copy using list() (Both list(...) and testList[:] are shallow copies).
You use copy.deepcopy(...) for deep copying a list.
deepcopy(x, memo=None, _nil=[])
Deep copy operation on arbitrary Python objects.
See the following snippet -
>>> a = [[1, 2, 3], [4, 5, 6]]...
Python “raise from” usage
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The difference is that when you use from, the __cause__ attribute is set and the message states that the exception was directly caused by. If you omit the from then no __cause__ is set, but the __context__ attribute may be set as well, and the traceback then shows the co...
oracle10g 网址收藏 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...indows (32-bit)
http://download.oracle.com/otn/nt/oracle10g/10201/10201_database_win32.zip
http://download.oracle.com/otn/nt/oracle10g/10201/10201_client_win32.zip
http://download.oracle.com/otn/nt/oracle10g/10201/10201_clusterware_win32.zip
http://download.oracle.com/otn/nt/oracle10g/1020...
oracle10g 网址收藏 - ORACLE - 清泛IT论坛，有思想、有深度
...t Windows (32-bit)
http://download.oracle.com/otn/nt/oracle10g/10201/10201_database_win32.zip
http://download.oracle.com/otn/nt/oracle10g/10201/10201_client_win32.zip
http://download.oracle.com/otn/nt/oracle10g/10201/10201_clusterware_win32.zip
http://download.oracle.com/otn/nt/oracle10g/10201/1...