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You must enable the openssl extension to download files via https
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edited Dec 11 '13 at 0:04
totymedli
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BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...过程当中的一次颠覆性改变。与前面几代不同的是，蓝牙4.0版引入的BLE协议更注重功耗问题，而非通信速率的提升。这也使得低功耗蓝牙更加节能，能使设备的电池维持很长时间，因此在很多可穿戴设备中得到了应用。
0x2 BLE工...
Making heatmap from pandas DataFrame
...eee']
columns = ['A', 'B', 'C', 'D']
df = DataFrame(abs(np.random.randn(5, 4)), index=index, columns=columns)
plt.pcolor(df)
plt.yticks(np.arange(0.5, len(df.index), 1), df.index)
plt.xticks(np.arange(0.5, len(df.columns), 1), df.columns)
plt.show()
This gives:
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Is there a way to check if int is legal enum in C#?
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[Flags] public enum PetType
{
None = 0, Dog = 1, Cat = 2, Rodent = 4, Bird = 8, Reptile = 16, Other = 32
};
public class Example
{
public static void Main()
{
object value;
// Call IsDefined with underlying integral value of member.
value = 1;
Console.Writ...
How can one change the timestamp of an old commit in Git?
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If you wanted to change the dates of commit 119f9ecf58069b265ab22f1f97d2b648faf932e0, you could do so with something like this:
git filter-branch --env-filter \
'if [ $GIT_COMMIT = 119f9ecf58069b265ab22f1f97d2b648faf932e0 ]
then
export GIT_AUTHOR_DATE="Fri Jan 2 21:38:53 2009 -08...
Linux进程与线程总结 [推荐] - C/C++ - 清泛网 - 专注C/C++及内核技术
...会发生阻塞，直至前面操作运行完毕释放信号量。
2. 2.4 条件变量（Cond）
条件变量类似于一个触发器，通常与互斥量结合使用，一个线程等待一个条件变量被触发，否则便会发送阻塞；条件变量阻塞后会同时对互斥对象进行解...
How can I generate an INSERT script for an existing SQL Server table that includes all stored rows?
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4 Answers
4
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Explanation of JSONB introduced by PostgreSQL
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475
+50
First, ...
低效程序员的7个坏习惯 - 创意 - 清泛网 - 专注C/C++及内核技术
...规范。我会照着规范写。’这是一种低效的编程。“
4、喜欢说“不”
低效的程序员缺乏对事物的“愿景”。因此，他们常常会对项目说’不’，或成为项目前进路上一股强劲的消极力量。 “当遇到挑战的时候，积极...
What's the rationale for null terminated strings?
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Hans PassantHans Passant
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