on click, update variable?

flemingmike · June 14, 2010

hello all, is it possible to update an xml variable when a link is clicked. my speciffic reason is i have an xml send that increases my volume. i need the volume variable to update though when it is increased or decreased. here is my code below:

<?php

include("style.php");

$hmm1 = simplexml_load_file('http://www.durhamit.ca:8181/1.0/?method=player.getvolume');

  
    $pc = 'player-command';    
    $vol = $hmm1->$pc->value;
    $volup = $hmm1->$pc->value +20;
    $voldown = $hmm1->$pc->value -20;



$hmm = simplexml_load_file('http://www.durhamit.ca:8181/1.0/?method=player.GetNowPlayingData');

foreach ($hmm->tracks as $tracks) {
    $ry = 'release-year';
    $artist = $tracks->track->artist;
    $title = $tracks->track->title;
    $album = $tracks->track->album;    
    $year = $tracks->track->$ry; 
    $genre = $tracks->track->genre;  
}



function decodeTime($seconds) {    
$mins = floor($seconds / 60);    
$secs = floor($seconds - ($mins * 60));    
if(strlen($secs) == 1) $secs = "0".$secs;    
return $mins.":".$secs;

}

$length = decodeTime($tracks->track->length);

//  Volume Percentage
function decodeTime1($seconds1) { 
$mins1 = floor($seconds);     
$secs1 = floor($seconds1 - ($mins1 / 2.55)); 
if(strlen($secs) == 1) $secs = "0".$secs;    
return "".$secs1;

}

$volper = decodeTime1($hmm1->$pc->value /2.55);







echo '<div id="musicinfo" align="center">		




<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
	<td align="center">



<table border="0" width="455">
<tr>
	<td rowspan="5" width="100">
<img border="0" src="http://www.durhamit.ca:8181/1.0/?method=player.getNowPlayingPicture" width="100" height="100"></td>
	<td align="center" width="87"><b>Artist:</b></td>
	<td>'.$artist.'</td>
	<td rowspan="5" align="center" width="64">
	<table border="0" width="47%" cellspacing="0" cellpadding="0">
		<tr>
			<td align="center"><a href="parse.php">
			<img border="0" src="images/Button-Refresh-icon.bmp" width="64" height="64"></a></td>
		</tr>
		<tr>
			<td align="center">Update</td>
		</tr>
	</table>
	</td>
</tr>
<tr>
	<td align="center" width="87"><b>Title:</b></td>
	<td>'.$title.'</td>
</tr>
<tr>
	<td align="center" width="87"><b>Album:</b></td>
	<td>'.$album.'</td>
</tr>
<tr>
	<td align="center" width="87"><b>Year:</b></td>
	<td>'.$year.'</td>
</tr>
<tr>
	<td align="center" width="87"><b>Length:</b></td>
	<td>'.$length.'</td>
</tr>

</table>




	</td>
</tr>
<tr>
	<td align="center">
	<table border="0" width="455">
		<tr>
			<td align="center">
			<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.play">
			<img border="0" src="images/Button-Play-icon.bmp" width="64" height="64"></a></td>
			<td align="center">
			<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.pause">
			<img border="0" src="images/Button-Pause-icon.bmp" width="64" height="64"></a></td>
			<td align="center">
			<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.previous">
			<img border="0" src="images/Button-Previous-icon.bmp" width="64" height="64"></a></td>
			<td align="center">
			<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.next">
			<img border="0" src="images/Button-Next-icon.bmp" width="64" height="64"></a></td>
		</tr>
		<tr>
			<td align="center">Play</td>
			<td align="center">Pause</td>
			<td align="center">Previous</td>
			<td align="center">Next</td>
		</tr>
		<tr>
			<td align="center" colspan="4">
			<table border="0" width="100%" cellspacing="0" cellpadding="0">
				<tr>
					<td align="center">
					<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='.$voldown.'" 

href="http://www.google.ca">
					<img border="0" src="images/Button-Delete-icon.bmp" width="64" height="64"></a></td>
					<td align="center" width="20%"><font size="5">Volume<br>'.$volper.'%</font></td>
					<td align="center">
					<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='.$volup.'">
					<img border="0" src="images/Button-Add-icon.bmp" width="64" height="64"></a></td>
				</tr>
			</table>
			</td>
		</tr>
		<tr>
			<td align="center"> </td>
			<td align="center"> </td>
			<td align="center">



			<iframe name="control" width="1" height="1" scrolling="no" frameBorder="0"></iframe>




			</td>
			<td align="center"> </td>
		</tr>
	</table>
	</td>
</tr>
<tr>
	<td align="center"> </td>
</tr>
<tr>
	<td align="center"> </td>
</tr>
</table>




   
</div>';




?>

mrMarcus · June 14, 2010

Sure it is. Once a variable has been set, regardless from what format/medium, it can be changed to whatever you like (within standards of course), which means you can increase/decrease if that variable is of numeric value.

flemingmike · June 14, 2010

ok, so i have

$pc = 'player-command';        
$vol = $hmm1->$pc->value;
$volup = $hmm1->$pc->value +20;    
$voldown = $hmm1->$pc->value -20;

but when i click on

<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='.$volup.'">						<img border="0" src="images/Button-Add-icon.bmp" width="64" height="64"></a>code]

it makes my volume go up +20, but it isnt updating the values, so if i click it again, the volume doesnt continue to go up.

mrMarcus · June 14, 2010

That's because $hmm->$pc->$value has a certain value that does not change. All you're code is doing is adding or subtracting 20 to/from $hmm->$pc->$value. You must make your volume dynamic so it can be altered and retain that altered value.

<?php
$pc 		= 'player-command';        
$vol 		= $hmm1->$pc->value;
$volup 		= ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) + 20;    
$voldown 	= ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) - 20;    

echo '<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='. $volup .'">UP</a> | <a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='. $voldown .'">DOWN</a>';

Untested, but that's at least the logic.

mrMarcus · June 14, 2010

NOTE: you should implement some $min and $max controls as my code will allow for unlimited increments of 20, and will allow for volume to be decreased to -20 which I'm sure is not an expected result.

Perhaps you can give that a stab or somebody will be nice enough to rough it in for you. Preferably, you should give it a shot.

flemingmike · June 14, 2010

it still doesnt update the volume variable when i click up. http://durhamit.ca/test/parse.php is my temp site.

i will attempt to to the max and min after i can get it working.

mrMarcus · June 14, 2010

The code I gave you will increment to the $volup and $voldown variables as the code stands, however, you need to then use those variables in your code somewhere to actually influence the volume control which I don't see anywhere in your code.

flemingmike · June 14, 2010

its in my code inside a table.

<table border="0" width="100%" cellspacing="0" cellpadding="0">
				<tr>
					<td align="center">
					<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='.$voldown.'">
					<img border="0" src="images/Button-Delete-icon.bmp" width="64" height="64"></a></td>
					<td align="center" width="20%"><font size="5">Volume<br>'.$volper.'%</font></td>
					<td align="center">
					<a target="control" href="http://www.durhamit.ca:8181/1.0/?method=player.setvolume&volume='. $volup .'">
					<img border="0" src="images/Button-Add-icon.bmp" width="64" height="64"></a></td>
				</tr>
			</table>

my top code now looks like this:

$hmm1 = simplexml_load_file('http://www.durhamit.ca:8181/1.0/?method=player.getvolume');

$pc = 'player-command';        
$vol = $hmm1->$pc->value;
$volup = ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) + 20;
$voldown = ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) - 20;

mrMarcus · June 14, 2010

What I meant was, there must be a call to whatever it is that is creating the volume (Ex. radio, etc.), where a variable would have to be passed to have the sound play at a certain volume, ie:

$hmm1 = simplexml_load_file('http://www.durhamit.ca:8181/1.0/?method=player.getvolume&volume=whatever');

All you seem to have are the controls, but those controls must send their input to something which then renders the values and outputs them. Or I'm really over-complicating things, either way, it's your code and not mine, so you should know it inside and out.

flemingmike · June 15, 2010

here are my options, so im not sure if i can do what you suggest

"Method" "Parameter" "Response" "Description"

player.getVolume None Default

player.setVolume volume Default Volume is set with a value between 0 (silent) and 255 (max).

mrMarcus · June 15, 2010

As I mentioned earlier, the code I presented you with will created incremental values of 20+/- which is what you asked, you just need to implement them which is pretty straight-forward.

flemingmike · June 15, 2010

well, thanks for the help. this is just too much over my head. im going to just make a few different buttons, and each button will have a predefined volume amount. (much easier for me)

thanks for the help though.

mrMarcus · June 15, 2010

Don't give up, man. You just need to understand that logic that you're missing.

Take this chunk and throw it in a file called test:

$vol 		= 0;
$volup 		= ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) + 20;    
$voldown 	= ((isset($_GET['volume']) && ctype_digit($_GET['volume'])) ? htmlspecialchars($_GET['volume'], ENT_QUOTES) : $vol) - 20;    

echo '<a target="control" href="test.php?volume='. $volup .'">UP</a> | <a target="control" href="test.php?volume='. $voldown .'">DOWN</a>';

You'll be able to see what's going on and how it's working.

flemingmike · June 15, 2010

ok, so i see how that is working now. i just dont get how to take that and make it a variable? if that is making any sense.?!?

mrMarcus · June 15, 2010

ok, so i see how that is working now. i just dont get how to take that and make it a variable? if that is making any sense.?!?

Nope, doesn't make any sense. Make what a variable?

It seems to me you've jumped into the deep end with weights around your ankles with code like this. You will never get better at any language starting on projects that are far past your experience level. You're just going to pick up bad practices and you will never have strong fundamentals in PHP.

I mean, if a project like this is a one-off thing and you're never going to touch PHP again, then sure, muscle through it. But, if you're planning on using PHP again, or as a career choice, then I suggest you stop with the more experienced applications and pick up a guide for beginners and get the basics right. It's the same with absolutely anything you do in life. People just seem to have this notion that programming/scripting/etc is not difficult, and subsequently you see that come to life when people ask you to create an e-commerce website for them for $150, because that's their "budget".

It's a lot more difficult than you might think, however, you're probably picking up on that now. And it won't get any easier.

/my 2 cents;

flemingmike · June 15, 2010

for the xml send i have to make a url like http://ww......./method=player.setvolume&volume=(*a number between 1 and 255*)

but in order to get the current volume, i need to parse the xml from http://ww....../method=player.getvolume and it is in the value portion.

so i have it so that $vol = the value of value in the player.getvolume xml output.

so when i click $volup, which is a calculation of $vol +/- 20, i then need the $vol value to update accordingly.

mrMarcus · June 15, 2010

Shouldn't you be passing your volume control to the xml feed then?

$hmm1 = simplexml_load_file('http://www.durhamit.ca:8181/1.0/?method=player.getvolume&volume=volume_number_goes_here');

flemingmike · June 15, 2010

the server doesnt accept it as a getvolume&volume= , it hjas to passed at setvolume&volume=.

and ya, this is a one off project, and just for my own personal use. i do alot of php stuff, but very very basic and just for my own stuff.

flemingmike · June 15, 2010

p.s. im calling it now... Leafs are going to sign Ilya Kovalchuk soon.

mrMarcus · June 15, 2010

the server doesnt accept it as a getvolume&volume= , it hjas to passed at setvolume&volume=.

and ya, this is a one off project, and just for my own personal use. i do alot of php stuff, but very very basic and just for my own stuff.

My bad, I wasn't paying much attention to the parameter names. I've exhausted my time here for now, so just keep tinkering.

And let's pray that they don't sign him seeing as how he made such a difference for Jersey (not). He's got a hell of a shot, but he's useless as an overall player.

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