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BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...的observer（扫描者）。数据包：数据包Access Address为一个32bit的随机值，由Initiator生成。数据包，其实是数据信道上的空中包的简称，数据包只在数据信道上传输，即除37/38/39之外的其余37信道（BLE总共占用40个信道）。每建立一次...
CreateWindow()动态创建一个EditBox - C/C++ - 清泛网 - 专注C/C++及内核技术
CreateWindow()动态创建一个EditBox在Win32代码或MFC代码中动态创建一个EditBox：在OnInitDialog()函数中： 创建EditBox HWND m_wndEdit = CreateWindow(_T("EDI...在Win32代码或MFC代码中动态创建一个EditBox：
在OnInitDialog()函数中：
// 创建Edit...
Concatenating two lists - difference between '+=' and extend()
... function call, which is slightly more expensive in Python than the INPLACE_ADD.
It's really nothing you should be worrying about, unless you're performing this operation billions of times. It is likely, however, that the bottleneck would lie some place else.
...
Java 8: performance of Streams vs Collections
...me: 41856183 ns (0.041856 seconds)
Streams: Elapsed time: 546590322 ns (0.546590 seconds)
Parallel streams: Elapsed time: 1540051478 ns (1.540051 seconds)
That' s for a big task! (int max = 10000000) Conclusion: collecting items to collection took majority of time. The slowest part ...
ObjectiveC Parse Integer from String
...pens when the number inside myStringContainingInt is too big to fit inside 32 bits--actually 31 bits since it's signed?
– Josh Hinman
Jun 20 '13 at 19:50
...
Foreign keys in mongo?
... Ben
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answered Sep 5 '13 at 13:23
ZAkyZAky
82255 silver badges191...
Generate a heatmap in MatPlotLib using a scatter data set
...data
x = np.random.randn(1000)
y = np.random.randn(1000)
sigmas = [0, 16, 32, 64]
for ax, s in zip(axs.flatten(), sigmas):
if s == 0:
ax.plot(x, y, 'k.', markersize=5)
ax.set_title("Scatter plot")
else:
img, extent = myplot(x, y, s)
ax.imshow(img, extent=ext...
Undefined reference to `pow' and `floor'
...
You can also use LD_PRELOAD to tell ld runtime linker to include libm.so in the memory map and symbol table of the process, so these symbols get loaded and everything works as expected
– debuti
May 28 '18 ...
How does std::forward work? [duplicate]
... does according to the standard:
§20.2.3 [forward] p2
Returns: static_cast<T&&>(t)
(Where T is the explicitly specified template parameter and t is the passed argument.)
Now remember the reference collapsing rules:
TR R
T& & -> T& // lvalue reference to ...
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is no
...SqlClient.TdsParserStateObject.ReadSniError(TdsParserStateObject stateObj, UInt32 error)
at System.Data.SqlClient.TdsParserStateObject.ReadSni(DbAsyncResult asyncResult, TdsParserStateObject stateObj)
you may need to update your .NET assemblies.
This issue occurs because of an error in the con...