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【解决】Error 515: Not connected to a Bluetooth device. - 创客硬件开发...
Error 515: Not connected to a Bluetooth device.
原因：经典蓝牙设备未正常连接上，就进行数据收发操作导致的异常，加一个连接状态判断就行。
BLE协议—广播和扫描 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包可以在其它信道上传输）。广播包发送给附近所有的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...
Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版 - 文档下载 - 清泛网 - ...
Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版Objective-C Mac iOS《Objective-C 2.0 Mac和iOS开发实践指南》专门为那些想要学习Objecti Ve-C以便为Mac OS x或iOS编写程序的程序员量身打造。《Objectiv...截图：
《Objective-C 2.0 Mac和iOS开发实践指南...
How is OAuth 2 different from OAuth 1?
...xplaining the majority of the differences in his article Introducing OAuth 2.0. To summarize, here are the key differences:
More OAuth Flows to allow better support for non-browser based applications. This is a main criticism against OAuth from client applications that were not browser based. Fo...
Migrating from JSF 1.2 to JSF 2.0
... in JSF 1.2 .
JSF 1.2 is around 6 years old now. I need to upgrade to JSF 2.0. How painful will this be? I noticed that some attributes in custom tags have been changed etc.
...
BLE协议—广播和扫描 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...道（channel）上传输，即只能在37/38/39信道上传输（注：从蓝牙5.0开始广播包可以在其它信道上传输）。广播包发送给附近所有的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...
Using multiple let-as within a if-statement in Swift
...iple queries in your optional chaining operation:
let dict = ["latitude": 2.0 as AnyObject?, "longitude": 10.0 as AnyObject?]
let latitude = dict["latitude"]
let longitude = dict["longitude"]
if let latitude = latitude as? Double, let longitude = longitude as? Double {
print(latitude, longitud...
What are the correct version numbers for C#?
...IEnumerators which implemented IDisposable. A few other small features.
C# 2.0 released with .NET 2.0 and VS2005 (November 2005). Major new features: generics, anonymous methods, nullable types, iterator blocks
C# 3.0 released with .NET 3.5 and VS2008 (November 2007). Major new features: lambda expr...
Adding rounded corner and drop shadow to UICollectionViewCell
...ew's layer to achieve both results.
cell.contentView.layer.cornerRadius = 2.0f;
cell.contentView.layer.borderWidth = 1.0f;
cell.contentView.layer.borderColor = [UIColor clearColor].CGColor;
cell.contentView.layer.masksToBounds = YES;
cell.layer.shadowColor = [UIColor blackColor].CGColor;
cell.laye...
Detect Retina Display
... running iOS4+ and if the [UIScreen mainScreen].scale property is equal to 2.0. You CANNOT assume a device is running iOS4+ if the scale property exists, as the iPad 3.2 also contains this property.
On an iPad running iOS3.2, scale will return 1.0 in 1x mode, and 2.0 in 2x mode -- even though we k...