Using HTTPService components

You can use an HTTPService component with any kind of server-side technology, including PHP pages, ColdFusion Pages, JavaServer Pages (JSPs), Java servlets, Ruby on Rails, and Microsoft ASP pages.

For API reference information about the HTTPService component, see mx.rpc.http.mxml.HTTPService.
Working with PHP and SQL data
You can use a Flex HTTPService component in conjunction with PHP and a SQL database management system to display the results of a database query in a Flex application and to insert data into a database. You can call a PHP page with GET or POST to perform a database query. You can then format the query result data in an XML structure and return the XML structure to the Flex application in the HTTP response. When the result has been returned to the Flex application, you can display it in one or more user interface controls.

MXML code

The Flex application in the following example calls a PHP page with the POST method. The PHP page queries a MySQL database table called users. It formats the query results as XML and returns the XML to the Flex application, where it is bound to the dataProvider property of a DataGrid control and displayed in the DataGrid control. The Flex application also sends the user name and e-mail address of new users to the PHP page, which performs an insert into the user database table.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns="*" creationComplete="send_data()">
    <mx:Script>
        <![CDATA[
            private function send_data():void {
                userRequest.send();
            }
        ]]>
    </mx:Script>
    <mx:Form x="22" y="10" width="493">
        <mx:HBox>
            <mx:Label text="Username"/>
            <mx:TextInput id="username"/>
        </mx:HBox>
        <mx:HBox>
            <mx:Label text="Email Address"/>
            <mx:TextInput id="emailaddress"/>
        </mx:HBox>
        <mx:Button label="Submit" click="send_data()"/>
    </mx:Form>
    <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.users.user}">
        <mx:columns>
            <mx:DataGridColumn headerText="User ID" dataField="userid"/>
            <mx:DataGridColumn headerText="User Name" dataField="username"/>
        </mx:columns>
    </mx:DataGrid>
    <mx:TextInput x="22" y="292" id="selectedemailaddress"
        text="{dgUserRequest.selectedItem.emailaddress}"/>
    <mx:HTTPService id="userRequest" url="http://localhost/myproj/request_post2.php" useProxy="false" method="POST">
        <mx:request xmlns="">
            <username>{username.text}</username>
            <emailaddress>{emailaddress.text}</emailaddress>
        </mx:request>
    </mx:HTTPService>
</mx:Application>

The HTTPService's send() method makes the call to the PHP page. This call is made in thesend_data() method in the Script block of the MXML file.
The resultFormat property of the HTTPService component is set to object, so the data is sent back to the Flex application as a graph of ActionScript objects. This is the default value for the resultFormatproperty. Alternatively, you can use a resultFormat of e4x to return data as an XMLList object on which you can perform ECMAScript for XML (E4X) operations. Switching the resultFormat property toe4x requires the following minor changes to the MXML code.
Note: If the result format is e4x, you do not include the root node of the XML structure in the dot notation when binding to the DataGrid.
The XML returned in this example contains no namespace information. For information about working with XML that does contain namespaces, see Handling results as XML with the e4x result format.

...
<mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.user}">
...
<mx:HTTPService id="userRequest" url="http://server/myproj/request_post2.php" useProxy="false" method="POST" resultFormat="e4x">
...

...
    <mx:XMLListCollection id="xc"
         source="{userRequest.lastResult.user}"/>
          
    <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{xc}">
...

CREATE TABLE `users` (
`userid` int(10) unsigned NOT NULL auto_increment,
`username` varchar(255) collate latin1_general_ci NOT NULL,
`emailaddress` varchar(255) collate latin1_general_ci NOT NULL,
PRIMARY KEY (`userid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci AUTO_INCREMENT=3 ;

<?php
define( "DATABASE_SERVER", "servername" );
define( "DATABASE_USERNAME", "username" );
define( "DATABASE_PASSWORD", "password" );
define( "DATABASE_NAME", "sample" );

//connect to the database.
$mysql = mysql_connect(DATABASE_SERVER, DATABASE_USERNAME, DATABASE_PASSWORD);

mysql_select_db( DATABASE_NAME );

// Quote variable to make safe 
function quote_smart($value)
{
 // Stripslashes
 if (get_magic_quotes_gpc()) {
 $value = stripslashes($value);
 }
 // Quote if not integer
 if (!is_numeric($value)) {
 $value = "'" . mysql_real_escape_string($value) . "'";
 }
 return $value;
}

if( $_POST["emailaddress"] AND $_POST["username"])
{
//add the user
$Query = sprintf("INSERT INTO users VALUES ('', %s, %s)", quote_smart($_POST['username']), quote_smart($_POST['emailaddress']));

$Result = mysql_query( $Query );
}

//return a list of all the users
$Query = "SELECT * from users";
$Result = mysql_query( $Query );

$Return = "<users>";

while ( $User = mysql_fetch_object( $Result ) )
{
$Return .= "<user><userid>".$User->userid."</userid><username>".$User->username."</username><emailaddress>".$User->emailaddress."</emailaddress></user>";
}
$Return .= "</users>";
mysql_free_result( $Result );
print ($Return)
?>

Working with ColdFusion and SQL data

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*" layout="absolute" creationComplete="userRequest.send()">
    <mx:Form x="22" y="10" width="493">
<mx:HBox>
 <mx:Label text="Username"/>
 <mx:TextInput id="username"/>
</mx:HBox>
<mx:HBox>
 <mx:Label text="Email Address"/>
 <mx:TextInput id="emailaddress"/>
</mx:HBox>
<mx:Button label="Submit" click="userRequest.send()"/>
 </mx:Form>
 <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.users.user}">
<mx:columns>
 <mx:DataGridColumn headerText="User ID" dataField="userid"/>
 <mx:DataGridColumn headerText="User Name" dataField="username"/>
</mx:columns>
 </mx:DataGrid>
 <mx:TextInput x="22" y="292" id="selectedemailaddress" text="{dgUserRequest.selectedItem.emailaddress}"/>
 <mx:HTTPService id="userRequest" url="http://server:8500/flexapp/returncfxml.cfm" useProxy="false" method="POST">
<mx:request xmlns="">
 <username>{username.text}</username>
 <emailaddress>{emailaddress.text}</emailaddress>
</mx:request>
 </mx:HTTPService>
</mx:Application>

...
<mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.user}">
...
<mx:HTTPService id="userRequest" url="http://server:8500/flexapp/returncfxml.cfm" useProxy="false" method="POST" resultFormat="e4x">
...

...
    <mx:XMLListCollection id="xc"
        source="{userRequest.lastResult.user}"/>
    <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{xc}">
...

CREATE TABLE `users` (
`userid` int(10) unsigned NOT NULL auto_increment,
`username` varchar(255) collate latin1_general_ci NOT NULL,
`emailaddress` varchar(255) collate latin1_general_ci NOT NULL,
PRIMARY KEY (`userid`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci AUTO_INCREMENT=3 ;

<cfprocessingdirective pageencoding = "utf-8" suppressWhiteSpace = "Yes">
<cfif isDefined("username") and isDefined("emailaddress") and username NEQ "">
 <cfquery name="addempinfo" datasource="sample">
 INSERT INTO users (username, emailaddress) VALUES (
    <cfqueryparam value="#username#" cfsqltype="CF_SQL_VARCHAR" maxlength="255">,
        <cfqueryparam value="#emailaddress#" cfsqltype="CF_SQL_VARCHAR" maxlength="255"> )
</cfquery>
</cfif>
<cfquery name="alluserinfo" datasource="sample">
    SELECT userid, username, emailaddress FROM users
</cfquery>
<cfxml variable="userXML">
    <users>
        <cfloop query="alluserinfo">
            <cfoutput>
                <user>
                    <userid>#toString(userid)#</userid>
                     <username>#username#</username>
                    <emailaddress>#emailaddress#</emailaddress>
                </user>
        </cfoutput>
        </cfloop>
    </users>
</cfxml>
<cfoutput>#userXML#</cfoutput>
</cfprocessingdirective>

Working with JavaServer Pages

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    
    <mx:HTTPService id="srv" url="catalog.jsp"/>

    <mx:DataGrid dataProvider="{srv.lastResult.catalog.product}" width="100%" height="100%"/> 
    
    <mx:Button label="Get Data" click="srv.send()"/>
    
</mx:Application>

...
    <mx:HTTPService id="srv" url="catalog.jsp" resultFormat="e4x"/>
...
    <mx:DataGrid dataProvider="{srv.lastResult.product}" width="100%" height="100%"/>

...
    <mx:XMLListCollection id="xc"
         source="{userRequest.lastResult.product}"/>
          
    <mx:DataGrid id="dgUserRequest" x="22" y="128" dataProvider="{xc}">
...

<%@page import="flex.samples.product.ProductService, 
                flex.samples.product.Product, 
                java.util.List"%>
<?xml version="1.0" encoding="utf-8"?>
<catalog>
<%
    ProductService srv = new ProductService();
    List list = null;
    list = srv.getProducts();
    Product product;
    for (int i=0; i<list.size(); i++)
    {
        product = (Product) list.get(i);
%>    
<product productId="<%= product.getProductId()%>">
<name><%= product.getName() %></name>
<description><%= product.getDescription() %></description>
<price><%= product.getPrice() %></price>
<image><%= product.getImage() %></image>
<category><%= product.getCategory() %></category>
<qtyInStock><%= product.getQtyInStock() %></qtyInStock>
</product>
<%
    }
%>
</catalog>

Calling HTTP services in ActionScript

<?xml version="1.0"?>
<!-- fds\rpc\HttpServiceInAS.mxml. Compiles --> 
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" verticalGap="10">
    <mx:Script>
        <![CDATA[
            import mx.controls.Alert;
            import mx.rpc.http.HTTPService;
            import mx.rpc.events.ResultEvent;
            import mx.rpc.events.FaultEvent;
            
            private var service:HTTPService 

            public function useHttpService(parameters:Object):void {
                service = new HTTPService();
                service.destination = "sampleDestination";
                service.method = "POST";
                service.addEventListener("result", httpResult);
                service.addEventListener("fault", httpFault);
                service.send(parameters);
            }

            public function httpResult(event:ResultEvent):void {
                var result:Object = event.result;
            //Do something with the result.
            }

            public function httpFault(event:FaultEvent):void {
                var faultstring:String = event.fault.faultString;
                Alert.show(faultstring);
            }
        ]]>
    </mx:Script>
</mx:Application>

To Find r's complement:
Use this formula to find complement of any Number system: ( r^ⁿ- N )

Where n = No. of Integer

For Example: 
The 10's complement of  (23450)₁₀ is 10^ⁿ – 23450 = 76550

Decimal-to-Octal Conversion

The process of decimal-to-octal conversion is similar to that of decimal-to-binary conversion. The
progressive division in the case of the integer part and the progressive multiplication while working
on the fractional part here are by ‘8’ which is the radix of the octal number system. Again, the integer
and fractional parts of the decimal number are treated separately. The process can be best illustrated
with the help of an example.
Example
We will find the octal equivalent of (73.75)10

Solution

• The integer part = 73

Divisor	Dividend	Remainder
8	73	-----
8	9	1
8	1	1
-----	0	1

• The octal equivalent of (73)10 = (111)8
• The fractional part = 0.75
• 0.75 × 8 = 0 with a carry of 6
• The octal equivalent of (0.75)10 = (.6)8
• Therefore, the octal equivalent of (73.75)10 = (111.6)8