CFLib.org – Common Function Library Project

Description:
Sends a UDP packet.

Return Values:
Returns nothing.

Example:

<cfoutput>
#sendUDP('192.168.1.123','90','I will be there')#
</cfoutput>

Parameters:

Full UDF Source:

<!---
 Sends a UDP packet.
 
 @param host      Host to send the UDP (Required)
 @param port      Port to send the UDP (Required)
 @param message      The message to transmit (Required)
 @return Returns nothing. 
 @author GaoChangwei (coldfusion.jquery@gmail.com) 
 @version 1, July 31, 2013 
--->
<cffunction name="sendUDP" access="private" returntype="string" output="false">
    <cfargument name="host" type="string" required="yes" hint="Host to send the UDP">
    <cfargument name="port" type="numeric" required="yes" hint="Port to send the UDP">
    <cfargument name="message" type="string" required="yes"  hint="The message to transmit">

    <cfset var text = arguments.message />
    <cfset var msg = arraynew(1) />
    
    <cfset var i = 0>
    <cfloop index="i" from="1" to="#len(text)#">
        <cfset msg[i] = asc( Mid(text, i, 1) ) />
    </cfloop>
    <!--- Get the internet address of the specified host --->
    <cfset address = createObject("java", "java.net.InetAddress").getByName(arguments.host) />
    
    <!--- Initialize a datagram packet with data and address --->
    <cfset packet = createObject("java", "java.net.DatagramPacket").init( javacast("byte[]",msg), 
                                                                          javacast("int",arrayLen(msg)), 
                                                                          address, 
                                                                          javacast("int",arguments.port)) />
                                                                          
    <!--- Create a datagram socket, send the packet through it, close it. --->
    <cfset dsocket = createObject("java", "java.net.DatagramSocket") />    
    <cfset dsocket.send(packet) />
    <cfset dsocket.close() />

</cffunction>