alihallo

alihallo · Sep 11, 2016, 4:57 PM

First of all, I also had the problem which could be solved by adding

@reboot sudo modprobe bcm2835-v4l2

at the last line of the crontab. Thank you very much!

It works fine for some hours, but suddenly the monitor does not show up again.
I cannot see error messages, but the following commands does not get an answer anymore…

/opt/vc/bin/tvservice -s

There is no return value anymore, it is just loading forever.
In the log it looks like this:

mm-0 monitor :state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
mm-0 monitor has been activated
mm-0 monitor :state 0x120002 [TV is off]
mm-0 monitor has been deactivated
mm-0 monitor :state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
mm-0 monitor has been activated
mm-0 monitor :state 0x120002 [TV is off]
mm-0 monitor has been deactivated
mm-0 monitor :state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
mm-0 monitor :
mm-0 monitor :
mm-0 monitor has been deactivated
mm-0 monitor :

As soon as the problem occures, the command

/opt/vc/bin/tvservice --preferred && sudo chvt 6 && sudo chvt 7

also does not switch the monitor on again.
It seems that the tvservice command just got a problem after some hours… Any idea how to solve this?
I need to restart the pi to get the monitor on again, after that everything works fine for some hours…

Best regards,
alihallo

alihallo · Sep 11, 2016, 12:29 PM

@strawberry-3-141 You are absolutly right, I made a bad example. The real html code is a little bit more complicated, so I mixed the real code with this example.
@ianperrin My input html is more complicated, but thanks for your answer, good to know!

@Plati It helped me a lot to look at other modules. You should use a node_helper.js, there you can create a function which gets the html code of the website.

//function which gets the data from the given URL
getTheData: function(theURLtoCatch) {
   var options = {url: theURLtoCatch};
   request(options, (error, response, body) => {
      if (response.statusCode === 200) {
         this.sendSocketNotification("DATA", this.parseHTML(body));
      } else {
         console.log("Error getting Data " + response.statusCode);
         this.sendSocketNotification("ERROR", response.statusCode);
      }
   });
},

parseHTML: function(dataBody) {
   //use something like ianperrin and strawberry showed in his example

}

alihallo · Aug 29, 2016, 7:54 PM

Thank you for your answer, but I coudn’t find out how to use the NPM request to parse the html code.
But I found another solution to solve the issue:

https://github.com/cheeriojs/cheerio

This way I could get the data out of the html code like this:

var options = {url: URL};
        request(options, (error, response, body) => {
            if (response.statusCode === 200) {
                this.sendSocketNotification("DATA", this.parseData(body));


...


var $ = cheerio.load(body, {
   normalizeWhitespace: true,
   xmlMode: false
});
		
$('div[class=data_1]').find('p').each(function (index, element) {
	data_array.push($(element).text());
});

This way I could solve my problem.

Best regards,
alihallo

alihallo · Aug 21, 2016, 11:54 AM

Currently I try to create my first little module and could need a hint from an experienced person.
In my node_helper.js I request the html code from an simple website by using:

var options = {url: URL};
        request(options, (error, response, body) => {
            if (response.statusCode === 200) {
                this.sendSocketNotification("DATA", this.parseData(body));

So in the variable body there is something like

<head>
...
</head>
<body><a name="top"></a>
   <div id="data_1">
      <p>The relevant data 1</p>
   </div>
   <div id="data_2">
      <p>The relevant data 2</p>
   </div>
...

My question is: What would you recommend to get the relevant data from this body into an local variable?
I first thought to use javascript & regex, but I guess that is not a good way to solve the issue, isn’t it?

Best regards,
alihallo

alihallo · Aug 19, 2016, 10:22 PM

@yo-less Your changes look great, would it be possible to provide the code?

alihallo

@alihallo

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