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IRXmitter红外发射器扩展 · App Inventor 2 中文网
...或获取要使用的载波频率，单位为赫兹(Hz)。默认值为38,000（38 kHz）。只能设置CarrierFrequencies或CarrierFrequencyList显示的值。如果指定了不支持的值，会触发Screen.ErrorOccurred事件，错误代码17302。
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Checking if a variable is not nil and not zero in ruby
...
unless discount.nil? || discount == 0
# ...
end
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How to add Action Bar from support library into PreferenceActivity?
...
EDIT: In appcompat-v7 22.1.0 Google added the AppCompatDelegate abstract class as a delegate you can use to extend AppCompat's support to any activity.
Use it like this:
...
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCo...
How to center align the ActionBar title in Android?
...r().setCustomView(R.layout.abs_layout);
abs_layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
...
How do I disable fail_on_empty_beans in Jackson?
...or me.
– ninjasense
Feb 14 '19 at 4:27
The perfect way if you have a empty object!
– Georgi Peev...
Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
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105
The compiler can't generally transform
for (int c = 0; c < arraySize; ++c)
if (data[c] ...
how to release localhost from Error: listen EADDRINUSE
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101
It means the address you are trying to bind the server to is in use. Try another port or close ...
How to deep copy a list?
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E0_copy is not a deep copy. You 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 opera...
C++ obtaining milliseconds time on Linux — clock() doesn't seem to work properly
...econds, but on this Linux box I'm working on, it rounds it to the nearest 1000 so the precision is only to the "second" level and not to the milliseconds level.
...
PowerShell script to return versions of .NET Framework on a machine?
...k. The earlier answers both return the root number on my system for .NET 3.0 (where the WCF and WPF numbers, which are nested under 3.0, are higher -- I can't explain that), and fail to return anything for 4.0 ...
EDIT: For .Net 4.5 and up, this changed slightly again, so there's now a nice MSDN a...