Headless chrome launcher - window dependent bug

I need to take a screenshot of a specific window size. I read this blog http://phptest.club/t/how-to-run-headless-chrome-in-codeception/1544 and this page https://developers.google.com/web/updates/2017/04/ headless-chrome , but couldn't figure out how to resize the window on initialization.

I tried to pass --window-size

in all parameters below and none works:

- window size = 1280,1696

- window size = 1280x1696

- window size 1280,1696

- window size 1280x1696

Worst of all , now my screenshot is blank after doing this for some time. Is there some memory saved in a non-browser browser causing this? I haven't tried restarting the Mac yet, but probably the next one.

So what is the way to get a full screenshot of the page at a given window size? In phantom.js, this is a very trivial thing.

My code is below

const chromeLauncher = require('chrome-launcher');
const CDP = require('chrome-remote-interface');
const file = require('fs');

(async function() {
  async function launchChrome() {
    return await chromeLauncher.launch({
      chromeFlags: [
        '--window-size=1280,1696',
        '--disable-gpu',
        '--headless'
      ]
    });
  }
  const chrome = await launchChrome();
  const protocol = await CDP({
    port: chrome.port
  });

  const {
    DOM,
    Network,
    Page,
    Emulation,
    Runtime
  } = protocol;
  await Promise.all([Network.enable(), Page.enable(), Runtime.enable(), DOM.enable()]);

  Page.navigate({
    url: 'https://www.yahoo.com/'
  });

  Page.loadEventFired(async() => {

    console.log('Start Page.loadEventFired');
    const script1 = "document.querySelector('p').textContent"
    const result = await Runtime.evaluate({
      expression: script1
    });
    console.log(result.result.value);

    const ss = await Page.captureScreenshot({format: 'png', fromSurface: false});
    file.writeFile('output.png', ss.data, 'base64', function(err) {
      if (err) {
        console.log(err);
      }
    });

    protocol.close();
    chrome.kill(); 
  });

})();

      

        
        
        
      

    

If I do this on the command line, it works great:

alias chrome-canary="/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary"

chrome-canary --headless --disable-gpu --screenshot --window-size=300,1696 https://www.yahoo.com/

      

        
        
        
      

    

UPDATE 1

I figured out that headless Chrome Canary is at least unstable on Mac. If I close the terminal and start it, then someday it works. But after he executed the exact same script, he just hung up for good (I left for the night). I just updated everything (Chrome Canary, chrome-launcher, chrome-remote-interface) today and continue to debug. Maybe this is not the main time.