chrome.tabCapture.capture返回的流未定义

问题描述

 函数handleCapture（stream）{
 console.log（'content captured'）; 
 console.log（backround.js stream：，stream）; 
 alert（stream）; 
 // localStream = stream; //由RTCPeerConnection addStream（）使用; 
 // initialize（）; //开始信令和同级连接过程
 
 
函数captureCurrentTab（）{
 console.log（'reqeusted current tab'）; 
 chrome.tabs.getSelected（null，function（tab）{
 console.log（'got current tab'）; 
 var selectedTabId = tab.id; 
 chrome.tabCapture .capture（{
 audio：false，
 video：true 
}，handleCapture）; 
}）; 
} 
  

然而，当这个运行时，handleCapture变量流传入的内容始终未定义？这是预期的还是有什么，我在这里失踪？

另外，我已确认我的manifest.json包含捕获权限，我正在使用chrome Canary版本31.0.1607.1 canary Aura。

感谢，
Mike

解决方案

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当我尝试纯粹从后台脚本驱动tabCapture时，发生了同样的问题，我在参考页面：

我的理解是，这意味着您需要从browserAction中为您的扩展驱动它，像这样：

  chrome.browserAction.onClicked.addListener（function（request）{
 chrome.tabs.getSelected（ null，function（tab）{
 chrome.tabCapture.capture（{audio：true，video：true}，callback）; 
}）; 
}）; 
  

这对我很有用。

I've got some js code in a chrome background extension of the following :

function handleCapture(stream) {
    console.log('content captured');
    console.log("backround.js stream: ", stream);
    alert(stream);
    // localStream = stream; // used by RTCPeerConnection addStream();
    // initialize(); // start signalling and peer connection process
}

function captureCurrentTab() {
    console.log('reqeusted current tab');
    chrome.tabs.getSelected(null, function(tab) {
        console.log('got current tab');
        var selectedTabId = tab.id;
        chrome.tabCapture.capture({
            audio : false,
            video : true
        }, handleCapture);
    });
}

However, when this is ran, the "handleCapture" variable "stream" that is passed in is always undefined? Is this to be expected or is there something that I am missing here?

Also, I've confirmed that my manifest.json contains the capture permission and I am using chrome canary Version 31.0.1607.1 canary Aura.

Thanks,Mike

解决方案

I had this same issue when I was trying to drive a tabCapture purely from a background script, I found this on the tabCapture reference page:

My understanding is that this means you need to drive it from a browserAction for your extension, like so:

chrome.browserAction.onClicked.addListener(function(request) {
    chrome.tabs.getSelected(null, function(tab) {
        chrome.tabCapture.capture({audio: true, video: true}, callback);
    });
});

That's what worked for me.

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