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【拍照图片处理】Attempt to invoke virtual method 'boolean android.grap...
在做图片识别App的时候，选择相册图片没有问题，拍照后图片就报错：
Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference
图片大致的处理流程是...
Service and Characteristic are not published by the connected device -...
Service and Characteristic are not published by the connected device，报错如下：
问题原因：硬件/蓝牙芯片问题导致的，比如A硬件测试好的，换了B硬件没有修改uuid，就出现这个报错。
由于B硬件没有发布这些特征，就会报这个错误。
Abstract classes in Swift Language
... importantly, notice that there is no dynamic dispatch. When logSalary is called on the instance that is stored as a SoftwareEngineer it calls the overridden version of the method. When logSalary is called on the instance after it has been cast to an Employee, it calls the original implementation (i...
Adding header for HttpURLConnection
...e use headers. I have to validate some credentials from android I am using php on xammp. how should i go for it. as i don't know how to write php code with headers
– Pankaj Nimgade
Feb 17 '15 at 8:00
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Only variables should be passed by reference
...file_name) cannot be turned into a reference. This is a restriction in the PHP language, that probably exists for simplicity reasons.
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BLE（四）嗅探工具 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...gle稳定，经常会抓不到后面数据通信的网络包，不过这一问题应该是可以通过优化算法得到解决的，但需要对官方的固件进行逆向或自己根据Nordic公司提供的BLE协议栈重写代码。。
优点：
价格便宜，USB Dongle淘宝价70...
Keep file in a Git repo, but don't track changes
...ut git status keep telling the file is modified
– rraallvv
Dec 21 '13 at 20:43
7
Yeah, this shoul...
CodeIgniter: How to get Controller, Action, URL information
...is->router->directory; Documentation: codeigniter.com/user_guide/installation/…
– cartalot
May 23 '16 at 21:55
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ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
... DLL的版本必须至少是4.71。但随着IE4 的发布，这已经不是问题了。(IE会夹带着这个DLL一起发布)
Custom Draw 基础
我将会尽我所能把Custom Draw的处理描述清楚，而不是简单的引用MSDN的文档。这些例子都需要你的程序有一个ListCtrl在...
PHP Sort a multidimensional array by element containing date
...compare")), so that usort() knows it's a class function/method. See also: php.net/manual/en/…
– Ferdinand Beyer
May 26 '10 at 16:26
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