inter

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: On my computer I have Windows 7 x86. I installed MinGW, I wrote the path but when I go in cmd.exe and write g++ -v it says: "g++" is not recognized as an internal or external command. But when I write the make -v command it recognizes it. I need this for school, I work in Eclipse, I even installed the latest java(I saw it must be installed). 回答1: Seeing that the make command works fine, I think you forgot to mark the mingw-gcc-g++ package in the MinGW Installation Manager. Run the MinGW Installation Manager again and mark mingw-gcc-g++ for

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: In order to determine whether a given type implements an interface using the reflect package, you need to pass a reflect.Type to reflect.Type.Implements(). How do you get one of those types? As an example, trying to get the type of an uninitialized os.Error (interface) type does not work (it panics when you to call Kind() on it) var err os.Error fmt.Printf("%#v\n", reflect.TypeOf(err).Kind()) 回答1: Do it like this: var err *os.Error t := reflect.TypeOf(err).Elem() Or in one line: t := reflect.TypeOf((*os.Error)(nil)).Elem() 回答2: Even Shaws

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: Strings are reference types, but they are immutable. This allows for them to be interned by the compiler; everywhere the same string literal appears, the same object may be referenced. Delegates are also immutable reference types. (Adding a method to a multicast delegate using the += operator constitutes assignment ; that's not mutability.) And, like, strings, there is a "literal" way to represent a delegate in code, using a lambda expression, e.g.: Func func = () => 5 ; The right-hand side of that statement is an expression whose

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have the same issue as this user: ant - not recognized as an internal however unfortunately none of the solutions have worked for me in that post or any other. I've also looked at other commands not recognized and specifically adding a path variable. The procedure I am using is as follows: Extract to a desired installation directory, e.g. C:\apache-ant Create an ANT_HOME environment variable` Open System Properties -> Advanced -> Environment Variables Create a new system variable Variable name: ANT_HOME Variable value: C:\apache-ant Add

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm using TestNG for testing and JMockit for mocking mockMethod(). Here's the test case: @Test public void testClass1 () { new MockUp < MyInterface >() { @Mock public int myMethod ( final MyObject someObject ){ return 0 ; } }; MyObject obj = new MyObject (); Assert . assertEquals ( obj . mockMethod ( someObject ), 0 ); } } The mockMethod() I'm calling for assertEquals() looks like this: public class Class1 { MyInterface my ; public int mockMethod ( final MyObject someObject ){ ...... //processing steps return my . myMethod (

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I want to develop voice and video call through our application users in android like Wechat Application. How can i doing this? I have searched in Google but i didn't get any exact reference or samples. Can anyone explain and give some sample source and references for doing this functionality? And I have few confusion about SIP and VOIP which one im going to use for support android versions 2.2 to higher versions applications? 回答1: Lumincall is an open source SIP. its under GPL licence so you wont Have to pay for it. Linphone is an open

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm on Mac OS X 10.8. Running Eclipse 4.2.2 with Pydev installed. I have a Django project that I run in a virtual environment for obvious reasons (libraries versioning etc.) When I attempt to point Eclipse to the interpreter 'python2.7' in the bin folder of the virtual environment, Eclipse spits out the error that it has failed to get info on the interpreter. Either it's unsupported (it is 2.7 so we're fine there) or it's an invalid interpreter (but I'm pointing to the alias). Any ideas what could be causing this, or steps to fix it? 回答1: I

A:接口概述 从狭义的角度讲就是指java中的interface 从广义的角度讲对外提供规则的都是接口 B:接口特点 a:接口用关键字interface表示 interface 接口名 {} b:类实现接口用implements表示 class 类名 implements 接口名 {} c:接口不能实例化 那么，接口如何实例化呢? 按照多态的方式来实例化。 d:接口的子类 a:可以是抽象类。但是意义不大。 b:可以是具体类。要重写接口中的所有抽象方法。(推荐方案) C:案例演示 接口特点 ` ` class Demo1_Interface { public static void main(String[] args) { //Inter i = new Inter(); //接口不能被实例化,因为调用抽象方法没有意义 Inter i = new Demo(); //父类引用指向子类对象 i.print(); } } interface Inter { public abstract void print(); //接口中的方法都是抽象的 } class Demo implements Inter { public void print() { System.out.println("print"); } } 原文：http://blog.51cto.com/357712148

resize在modules/imgproc/src/文件件中,首先看resize API的函数实现: void resize(InputArray src, OutputArray dst, Size dsize, double fx= 0 , double fy= 0 , int interpolation=INTER_LINEAR ) 参数说明: src:输入图像 dst:输出图像,dst的数据类型与src相同. dsize:这个参数是输出图像的尺寸,两种情况,如果该参数设置为0,api会自动计算 输出参数,否则按照输入尺寸.dst的计算公式: d s i z e = S i z e ( r o u n d ( f x × s r c . c o l s ) , r o u n d ( f y × s r c . r o w s ) ) d s i z e = S i z e ( r o u n d ( f x × s r c . c o l s ) , r o u n d ( f y × s r c . r o w s ) ) 所以当dsize为0的时候,fx和fy不能为0. fx: ( d o u b l e ) d s i z e . w i d t h / s r c . c o l s ( d o u b l e ) d s i z e . w i d t h /

一． tag： VLAN（Virtual Local Area Network）的中文名为"虚拟局域网"。虚拟局域网（VLAN）是一组逻辑上的设备和用户，这些设备和用户并不受物理位置的限制，可以根据功能、部门及应用等因素将它们组织起来，相互之间的通信就好像它们在同一个网段中一样，由此得名虚拟局域网。VLAN是一种比较新的技术，工作在OSI参考模型的第2层和第3层，一个VLAN就是一个广播域，VLAN之间的通信是通过第3层的路由器来完成的。与传统的局域网技术相比较，VLAN技术更加灵活，它具有以下优点： 网络设备的移动、添加和修改的管理开销减少；可以控制广播活动。 传统的数据包转发，交换机查看数包的mac地址，根据mac地址表转发。在配置了Vlan的以太网环境中，当交换机从pc处接收了一个原始的数据包，会在源MAC地址与type字段汇中插入 4Byte 的802.1Q字段用来标识Vlan-tag。 1. 802.1Q报文： ① Tag Protocol：2字节，tag标签规范，用来定义tag标签标准，华为默认使用0x8100 ② User Priority：3bit，用户优先级，用来表明数据包优先级值，QOS使用 ③ CFI：1bit，规范格式指示，0表示规范格式，应用于以太网；1表示非规范格式，应用于Token Ring（令牌环网） 802.1Q 抓包： 2. Vlan有效值：