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2014-01-27 Simple PHP POST API call (using file_get_contents)

1 files attached: apiCall.php
apiCall.php

<?php
function apiCall($path,$params){
	$result=array();
	$url='http://crm.sorescu.eu/'.$path;
	$opts=array('http'=>array('method'=>'POST','header'=>'Content-type: application/x-www-form-urlencoded','content'=>http_build_query($params)));
	$out=file_get_contents($url,false,stream_context_create($opts));
	$result['url']=$url;
	$result['in']=$params;
	$result['out']=json_decode($out,true);
	return $result;
}?>

2013-12-11 Simple HTA widget to see online data on desktop

How to:

paste the main code below in a file named my_file.hta;
just run the file by double-clicking it;
close it by ALT-F4'ing it after getting it in focus.

Features:

Supports resizing with mouse drag from the bottom-right corner;
Supports moving the HTA on display using the CTRL-drag from the same bottom-right corner

Tips for power users:

Make it Always on top:

install an utility to bring windows on top (like http://www.softpedia.com/get/System/OS-Enhancements/PowerMenu.shtml);
set attribute head/HTA:APPLICATION CAPTION="yes" - if you are using Power Menu;
press F5 to refresh the widget and show the window caption;
set the window always-on-top using the utility;
set attribute head/HTA:APPLICATION CAPTION="no" - if you are using Power Menu;
TADA! You have now a small always-on-top HTML page showing your custom HTML page on desktop;

Show/hide it from task bar by manipulating the SHOWINTASKBAR attribute.

Sample caption (details below are server-side HTML that checks the status of 3rd party systems):

1 files attached: application.hta
application.hta

2013-11-28 How to throw an exception in Java even if the compiler does not allow you to...

How to throw an exception that you are not allowed to...

Did you ever get frustrated when a previous developer declared an interface that simply won't allow you to throw a new type of exception?: Rethrow it wrapped in a runtime exception: throw new RuntimeException(myOldJunkyException)
Did you ever need to rethrow the very same exception as reported by a remote system?: Serialize it, receive it, and rewrap it in a synthetic new exception with new RuntimeException().setStackTrace(myNewSyntheticStackTraceIncludingRemoteJunkyLines)

Or, just throw it as it is, by breaking the "convention" of throwing only declared exceptions from the method signature (which anyway the JVM does not care much at run time)... Usage:

public static int main(String[] args) throws IOException {
	THROW(new RuntimeException());
	return "dummy statement that won't ever be executed, but it's requied to compile the function. The compiler cannot figure out that the THROW will throw an exception... :D".length();
}

PS: Don't try it on JVM clones, it might not work at all. Neither on Google's Dalvik...

2 files attached: HelperClass.java Usage.java
HelperClass.java Usage.java

2013-11-06 Windows NTNET test on "Java code to check if LDAP (including AD over LDAP) with basic authentication works (check if user/password) is valid"

Thanks to Dmitriy, I put below additional notes and an example on real-life NTNET domain test (sterilized code). The code below was tested on my current (production) NTNET DC and it worked fine.
Notes: {domain_controller_machine} can be found by running Windows echo %logonserver%, then run tracert {logon_server} to identify it's full name.
{my_ntnet_user in short form} is my NTNET user without any realm or domain information.

1 files attached: Test.java
Test.java

2013-11-05 Shortest (generally working) full-screen toggle coode

1 files attached: sample.html
sample.html

<div class='pull-right' onclick='$(this).find("a").toggle()'>
	<a onclick='for(var k in{request:1,webkit:1,moz:1,ms:1})try{document.documentElement[k+"RequestFullScreen"]();}catch(e){console.log(e)}'><%icon:maximize%></a>
	<a style='display:none' onclick='for(var k in{exitFulls:1,mozCancelFullS:1,webkitCancelFullS:1})try{document[k+"creen"]();}catch(e){console.log(e)}'><%icon:window%></a>
</div>

2013-11-05 Java code to check if LDAP (including AD over LDAP) with basic authentication works (check if user/password) is valid

Straight-forward pinging an LDAP server (to check if also authentication works).

1 files attached: Test.java
Test.java

package dms;
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.ldap.LdapName;
public class Test {
	public static void main(String[] args) {
		try {
			test();
		} catch (NamingException e) {
			System.out.println(e.getMessage());
		}
	}

	public static void test() throws NamingException {
		Hashtable<String, String> env = new Hashtable<String, String>();
		env.put(Context.INITIAL_CONTEXT_FACTORY,
				"com.sun.jndi.ldap.LdapCtxFactory");
		env.put(Context.PROVIDER_URL, "ldap://ldap_server.www.company.com:389/o=Users");
		env.put(Context.SECURITY_AUTHENTICATION, "simple");
		env.put(Context.SECURITY_PRINCIPAL,
				"CN=myUserName,CN=Users,DC=ldap_server,DC=www,DC=company,DC=com");
		env.put(Context.SECURITY_CREDENTIALS, "********");
		DirContext ctx = new InitialDirContext(env);
		Name name=new LdapName("invalid_name");
		Object o=null;
		ctx.bind(name, o);
		//Should throw "invalid name exception"
	}
}

2013-11-01 jQuery.val("input[type=checkbox]"[,value]) custom setter and getter - to work similar to regular input fields

Sample script on how to overwrite the jQuery val() for checkbox fields so that jQuery.val("input[type=checkbox]"[,value]) is in line with the one for input text.

1 files attached: jQueryValOverwrite.js
jQueryValOverwrite.js

$.valHooks.checkbox.get=function(a){return $(a).attr('checked')?'checked':''}
	$.valHooks.checkbox.set=function(a,b){$(a)[$(a).attr('checked')?'removeAttr':'attr']('checked','checked');}

2013-10-28 HTML5 Canvas - sample gauge for smart home monitoring systems

Wrapper over HTML5 canvas for polar drawing (coordinates origin are in the centre of the canvas, the angle coordinate goes anti-clockwise, and the unitary magniture is the minimum of width and height of canvas) is attached. Instantiation is:

		var canvas=document.getElementById(dialName+"_z");
		var drawing=new Drawing(canvas);

. Sample usage (partial code) is in Sample.js. Result is:

2 files attached: Canvas.js Sample.js
Canvas.js Sample.js

:for(var sensorIdx=0;sensorIdx<sensors.length;sensorIdx++){
	var dialName=sensors[sensorIdx];
	var canvas=document.getElementById(dialName+"_z");
	var drawing=new Drawing(canvas);
	drawing.clear();
	drawing.circle({w:0.5,r:1,fg:'#000',bg:'#448'});
	drawing.circle({r:0.85,fg:'#111',bg:'#eee'});
	drawing.line({w:4,fg:'#f00',from:{a:Math.PI/2,m:0},to:{a:Math.PI/2,m:0.98}});
	drawing.line({w:2,fg:'#ff0',from:{a:Math.PI/2,m:0},to:{a:Math.PI/2,m:0.97}});
	for(var hour=1;hour<=12;hour++){
		drawing.line({w:0.25,fg:'#777',from:{x:0,y:0},to:{a:offsetA-Math.PI*2*(hour)/(12),m:0.85}});
		drawing.text({a:offsetA-Math.PI*2*(hour)/(12),m:0.925,text:hour,size:0.125,fg:'#bbb'});
	}
	:
	if(MOUSE_OVER){
		if(dialName==MOUSE_OVER.sensor){
			MOUSE_OVER.at=Math.atan2(-MOUSE_OVER.y+canvas.height/2,MOUSE_OVER.x-canvas.width/2);
			while(MOUSE_OVER.at<0)
				MOUSE_OVER.at+=2*Math.PI;
			while(MOUSE_OVER.at>=2*Math.PI)
				MOUSE_OVER.at-=2*Math.PI;
			drawing.line({from:{a:0,m:0},to:{a:MOUSE_OVER.at,m:0.85},w:2,fg:'#f70'});
		}
	}
	:
	drawing.circle({w:0.5,r:0.4,fg:'#000',bg:'#dde'});
	var params={};
	drawing.text({x:0,y:1.2,text:allSensors[sensorProperties.name].label,size:0.2,align:'center',bg:'#000',fg:'#ff0'});
	var lastPoint=null;
	var tooltips=[];
	for(var dataIdx=0;dataIdx<data.length;dataIdx++){
		var x=data[dataIdx][0];
		if(lastTS-x>1000000)continue;
		if(!minTSIdx)minTSIdx=dataIdx;
		if(data[minTSIdx][0]>x)
			minTSIdx=dataIdx;
		var y=data[dataIdx][1+json.sensor2column[sensorProperties.name]];
		if(!data[dataIdx][1+json.sensor2column[sensorProperties.name]])continue;
		if((x==null)||(y==null))continue;
		x/=100;
		var min=x%100;
		var hour=((x-min)/100)%100;
		var params={};
		params.w=0.5+3*dataIdx/data.length*dataIdx/data.length;
		params.from=lastPoint;
		var chan=2.5+2.5*Math.sin(Math.PI*2*((12+6+hour-1)/24));
		chan=Math.round(chan);
		params.fg='rgba('+chan*255/5+',0,'+(5-chan)*255/5+','+(1)+')';
		params.to={};
		params.to.a=offsetA-2*Math.PI*(hour/12+min/12/60);
		while(params.to.a<0)
			params.to.a+=2*Math.PI;
		while(params.to.a>=2*Math.PI)
			params.to.a-=2*Math.PI;
		params.to.m=(y-minVal)/(maxVal-minVal)*0.4+0.4;
		params.y=y;
		if(lastPoint){
			drawing.line(params);
			if(MOUSE_OVER)
			if(dialName==MOUSE_OVER.sensor){
					//alert(params.from.a);
						//alert([params.from.a,MOUSE_OVER.at,params.to.a]);
						if(between(params.from.a,MOUSE_OVER.at,params.to.a)){
							if(tooltips.length==2)
								alert([params.from.a,MOUSE_OVER.at,params.to.a]);
							tooltips.push(dataIdx);
						}
				}
		}
		lastPoint=params.to;
	}
	var rezolutie=allSensors[sensorProperties.name].resolution;
	//alert(rezolutie);
	var actualValue=Math.round(params.y/rezolutie)*rezolutie;
	var yesterdaysValue=Math.round(data[minTSIdx][colIdx]/rezolutie)*rezolutie;
	actualValue=1*actualValue.toFixed(6);
	yesterdaysValue=1*yesterdaysValue.toFixed(6);
	var delta=actualValue-yesterdaysValue;
	delta=1*delta.toFixed(6);
	if(delta>0)
		delta='+'+delta;
	delta=delta+' ';
	//alert(data[minTSIdx][0]);
	drawing.text({x:0,y:-0.34,text:minVal,size:0.1,bg:"#bbb"});
	drawing.text({x:0,y:+0.34,text:maxVal,size:0.1,bg:"#bbb"});
	if(actualValue>yesterdaysValue){
		drawing.text({x:0,y:0.2,text:actualValue,size:0.25,align:'center',fg:params.fg,bg:params.fg});
		drawing.text({x:0,y:0,text:delta+"&#8599;",size:0.1,bg:"#f00",align:"center"});
		drawing.text({x:0,y:-0.15,text:allSensors[sensorProperties.name].um,size:0.2,align:'center',fg:params.fg,bg:params.fg});
		//drawing.text({x:0,y:-0.05,text:delta,size:0.1,align:"center"});
	}else if(actualValue<yesterdaysValue){
		drawing.text({x:0,y:0.2,text:actualValue,size:0.25,align:'center',fg:params.fg,bg:params.fg});
		drawing.text({x:0,y:0,text:delta+"&#8600;",size:0.1,bg:"#00f",align:"center"});
		drawing.text({x:0,y:-0.15,text:allSensors[sensorProperties.name].um,size:0.2,align:'center',fg:params.fg,bg:params.fg});
		//drawing.text({x:0,y:-0.05,text:,size:0.1,align:"center"});
	}else{
		drawing.text({x:0,y:0,text:actualValue+allSensors[sensorProperties.name].um,size:0.2,align:'center',fg:params.fg,bg:params.fg});
	}

2013-10-16 JackRabbit JCR - initial setup and "Hello World" to check that R/W access was granted

How I made the first Jackrabbit JCR have R/W access on the local environment. The smoke test (ran from a different application) is mentioned in SmokeTest.java. The reason I published this trivial code snippet (most of it copied from somewhere from the internet) is that I got frustrated for hours searching for a working snippet to grant me writing access.

2 files attached: Test.java SmokeTest.java
Test.java SmokeTest.java

Node root=session.getRootNode();
System.out.println(root.addNode("message!").getPath());
root.setProperty("number",123); System.out.println(root.getPath());
System.out.println(root.getNode("message!"));

2013-09-04 How to batch-kill processes in Windows from command prompt - taskkill /im image.exe /t /f

Automating web pages in Chrome using Selenium leads to lots of Chrome windows open that even if closed, the driver remains open. I am using the command taskkill /im chromedriver.exe /t /f to:

close all the Chrome Driver server processes;
close the Chrome Driver server process tree of children (/t);
close the Chrome Driver server processes forcefully (/f);