如何捕获客户端“桌面”部分的屏幕截图。使用HTML / JavaScript？ [英] How to capture screenshot of parts of the client "desktop" using HTML/JavaScript ?

问题描述

我知道如何捕获网页，但我想知道如何在桌面上捕获桌面或其他应用程序？如果有任何方式突出显示部分屏幕。就像html2canvas对网页的作用一样，我们可以使用HTML / JS中的浏览器应用程序为桌面应用程序做些什么吗？

I know how to capture webpage, but I am asking to how capture desktop or another application in the desktop ? And if there is anyway to highlight parts of screen. Like how html2canvas does for webpages, can we do something for desktop applications using a browser app in HTML/JS ?

推荐答案

是的，它是可能的！
但据我所知只有Firefox和Chrome（我使用的是Chrome）。感谢屏幕截图和WebRTC。 有关WebRTC的更多信息

Yes, it is possible!
But as far as I know only for Firefox and Chrome (I used Chrome). Thanks to Screen Capturing and WebRTC. More info about WebRTC

我用了一个名为 RTCMultiConnection 的图书馆非常易于使用，但你也应该可以不用任何用途图书馆。

I used a library called RTCMultiConnection which is very easy to use, but you should be able to do that also without any use of a library.

这里，只是给你一个起点：

Here, just to give you a startingpoint:

// 1. Create the connection Objekt
var connection = new RTCMultiConnection();

// 2. Activate screen, which is the whole monitor, not only the browser window!
connection.session = {
    screen: true,
    data: false,
    oneway: true
};

// 3. Create the callback for the stream
connection.onstream = function(event) {
  // Make something with the event
  // event.stream contains the stream, event.mediaElement the media
  // I used event.mediaElement as parameter to draw the frage into an canvas; via context2d.drawImage(event.mediaElement, ...)
  // Then I create an base64 String via canvas.toDataURL("image/png") and 
  // Don't forget to stop the stream if you just want to have one single image
};

// 4. Start Desktop Sharing
connection.open({
  // you could register a onMediaCaptured callback here
});

这篇关于如何捕获客户端“桌面”部分的屏幕截图。使用HTML / JavaScript？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！