capture | 易学教程

CVPixelBufferLockBaseAddress why? Capture still image using AVFoundation

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问题 I'm writing an iPhone app that creates still images from the camera using AVFoundation. Reading the programming guide I've found a code that does almost I need to do, so I'm trying to "reverse engineering" and understand it. I'm founding some difficulties to understand the part that converts a CMSampleBuffer into an image. So here is what I understood and later the code. The CMSampleBuffer represent a buffer in the memory where the image with additional data is stored. Later I call the

addEventListener()的第三个参数可以传对象了

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在你的印象里是不是这样的target.addEventListener(type, listener[, useCapture]) 新的语法 target.addEventListener(type, listener [,{capture: Boolean, bubbling: Boolean, once: Boolean}]); type 表示监听事件类型的字符串 listener 当所监听的事件类型触发时，会接收到一个事件通知 options (可选) capture 表示listener会在该类型的事件捕获阶段传播到该EventTarget 时触发。 once 表示listener在添加之后最多只调用一次。如果是 true，listener会在其被调用之后自动移除。 passive 表示listener永远不会调用preventDefault()。如果listener仍然调用了这个函数，客户端将会忽略它并抛出一个控制台警告。实例 html结构 <nav id= "menu" ><a href= "https://juejin.im" >首页</a></nav> 复制代码获取引用 var nav = document.getElementById( 'menu' ) var link = nav.firstElementChild 复制代码 capture:

How to capture full HTTP request data (headers and body) with PHP?

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问题 I have a problem implementing an API that works with Java, but fails to work with cURL. We've gone through everything so far and there must be something that is different between the requests that Java makes and what we make. In PHP we can get header data by looking at $_SERVER['HTTP_*'] variables and we can get request body from file_get_contents('php://input'); But we cannot get the exact data sent from user agent to client. Is it possible to get the full request, that user agent sends,

android: video capturing on device or emulator [closed]

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问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . is it possible to capture what's going on in an android screen as video, either on the device itself or the emulator? thanks! 回答1: You could use one of the many screencast webapps - I personally use http:/

How to create an AST with a CAPTURE binding?

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问题 I am interested in using the Eclipse JDT to create a CAPTURE binding. I've read several capture conversion tutorials, but when I copy-paste sample code snippets, I can never find a capture conversion binding in the Abstract Syntax Tree (using the plugin ASTView for visualizing the AST). How can this be accomplished? 回答1: Example provided by Deepak Azad @ Eclipse Forums: interface Box<T> { public T get(); public void put( T element); } class CaptureTest { public void rebox( Box<?> box) { box

Capturing a Lambda's static in a Nested Lambda

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问题 In this answer I use this code: std::vector<std::vector<int>> imat(3, std::vector<int>(10)); std::for_each(imat.begin(), imat.end(), [&](auto& i) { static auto row = 0; auto column = 0; std::transform(i.begin(), i.end(), i.begin(), [&](const auto& /*j*/) { return row * column++; }); ++row; }); But I notice some misbehavior in capturing static auto row depending upon the compiler. Clang 3.7.0 yields: 0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 5 6 7 8 9 0 2 4 6 8 10 12 14 16 18 gcc 5.1.0 yields: 0 0 0 0 0 0

Accessing multiple captures in a RegEx (Newbie thing…)

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问题 in this regex multiple capture I have to add "g" flag to obtain all items... "aaa bbb ccc \n.000.\n \n.111.\n sd555 dsf \n.222.\n ddd ".match( /^.(.*).$/gm ) when I add the "g" (global) flag ?how do access the captured groups... there should be 3 like ["000", "111", "222"] but i don't know how to access them... I keep getting [".000.", ".111.", ".222."] << note the dots before and after the words 回答1: If you want to get capture groups in a global regex, you can't use match , unfortunately.

General capturing with WM_PRINT and WM_PRINTCLIENT, supported on at least Windows 7

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问题 So far I got this partially working capturing function in C#: /// <summary> /// Captures a HWND, using a WM_PRINT windows message to draw into a memory DC. /// Pro: Does also work if the HWND is not positioned inside the visible screen. /// Con: Does only work if the target handle supports WM_PRINT and WM_PRINTCLIENT. /// TODO: Subclass the target handle and hack the WM_PRINT support for various systems, including Windows 7. /// Example for Windows 2000 see http://www.fengyuan.com/article

Device specific screen capturing on android

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问题 We need to find a way to capture Android screen, without using any external software, which will work on a non-rooted phone. My research shows that there is no way to do that. In any way, you should have root permissions, to be able to capture device's screen. Further research, however, shows, that there is a way for limited number of devices, to do that, without having root privileges. As a proof I can bring following application on Android market: Screenshot UX. It claims, that app doesn't

Opencv中将视频保存为连续的图片和连续的图片保存为视频

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一直觉得Opencv是个很实用的很伟大的东西，很多功能总是能够在不经意间实现，下面就将AVI视频每一帧保存为图片（.jpg，.bmp），和连续图片保存为视频来演示一下：直接贴代码，只要学了Opencv一个星期的，绝对看的懂了： #include <stdlib.h> #include <stdio.h> #include <math.h> #include <cv.h> #include <highgui.h> #define NUM_FRAME 300 //只处理前300帧，根据视频帧数可修改 void Video_to_image(char* filename) { printf("------------- video to image ... ----------------n"); //初始化一个视频文件捕捉器 CvCapture* capture = cvCaptureFromAVI (filename); //获取视频信息 cvQueryFrame(capture); int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT); int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);