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<task id="GUID-8A5054C9-7556-5153-8CEE-FA8E5F4155AE" xml:lang="en"><title>How
to Create an Explicitly Bound Socket</title><shortdesc>This topic describes how create an explicitly bound socket. </shortdesc><prolog><metadata><keywords/></metadata></prolog><taskbody>
<context><p>Start the network interface connection with <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita#GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD/GUID-CB62E838-A380-309C-8B08-1F804EDB4387"><apiname>RConnection::Start()</apiname></xref> to
create an explicitly bound socket. </p> <p><b>Creating an explicitly bound
socket</b></p><p>  Explicitly bound sockets can be created in two ways: </p> </context>
<steps id="GUID-46A5DC4D-4DF0-400D-ACA1-D34F7DC7D2AD">
<step id="GUID-AF44E5D1-D088-4F16-A801-129E443B52F2"><cmd>Open a socket and bind the socket to a network interface connection.</cmd>
<stepxmp><ul>
<li><p>  Call <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-3491CE2A-A94D-34E0-B0DD-D476EE3334D7"><apiname>RSocket::Open()</apiname></xref> and pass an  <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref>. </p> <p>  <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> binds
to an interface  corresponding to the <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref>. </p> <p> 
In the following example code, if <codeph>iConn</codeph> corresponds  to a
WiFi <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> then, after a calling  <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-3491CE2A-A94D-34E0-B0DD-D476EE3334D7"><apiname>RSocket::Open()</apiname></xref> the
socket is explicitly bound to WiFi. </p> <codeblock xml:space="preserve">iRecvSock.Open( ss, KAfInet, KSockStream, KProtocolInetTcp, iConn );</codeblock> </li>
</ul></stepxmp>
</step>
<step id="GUID-8F737ED5-AEE8-4E3F-BBBF-F5EB4B05F815"><cmd>Open a socket and bind the socket to an IP address of the network
interface connection.</cmd>
<stepxmp><ul>
<li><p>  Call <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-5550C9E4-2A1B-3F52-A6CF-F5822AB9DBC9"><apiname>RSocket::Bind()</apiname></xref> and bind the socket to  an
IP address of the network interface connection. </p> <p>  <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita#GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0/GUID-5550C9E4-2A1B-3F52-A6CF-F5822AB9DBC9"><apiname>RSocket::Bind()</apiname></xref> binds
the socket to a unique  IP address of the network interface connection. </p> <p> 
The following example code shows how to open a socket and bind  the socket
to a unique IP address of the WiFi connection. </p>  <codeblock xml:space="preserve">// open an implicit socket
TInt err = iRecvSock.Open( iSs, KAfInet, KSockDatagram, KProtocolInetUdp); 
User::LeaveIfError( err );
// This IP address maps to WiFi in the ced.cfg file
_LIT(KRasAddr,"192.168.220.4");
const TInt KPort = 7000;
TInetAddr addr;
err = addr.Input( KRasAddr ); 
User::LeaveIfError( err );
addr.SetPort( KPort );
// Now the socket is explicitly bound to WiFi  
err = iRecvSock.Bind( addr ); 
RDebug::Print( _L("testapp: ETH Bind() = %d"), err ); 
User::LeaveIfError( err );
</codeblock> </li>
</ul><p> The following code block shows an extract from the <filepath>ced.cfg</filepath> file.
 </p><codeblock xml:space="preserve">
## 
[LANService]
ADD_SECTION
# COMMDB_ID = 1
Name=Ethernet
IfNetworks=ip
IpNetMask=255.0.0.0
IpGateway=0.0.0.0
IpAddrFromServer=FALSE
IpAddr=192.168.1.1
IpDNSAddrFromServer=FALSE
ConfigDaemonManagerName=NetCfgExtnDhcp
ConfigDaemonName=!DhcpServ
FIELD_COUNT=9
END_ADD

ADD_SECTION
# COMMDB_ID = 2
Name=Ethernet WiFi
IfNetworks=ip
IpNetMask=255.0.0.0
IpGateway=0.0.0.0
IpAddrFromServer=FALSE
-// This IP address maps to WiFi
IpAddr=192.168.220.4
IpDNSAddrFromServer=FALSE
IpNameServer1=194.72.6.51
IpNameServer2=194.72.6.52
ConfigDaemonManagerName=NetCfgExtnDhcp
ConfigDaemonName=!DhcpServ
LanServiceExtensionTableName=WLANServiceExtensionTable
LanServiceExtensionTableRecordId=4
FIELD_COUNT=13
END_ADD
</codeblock></stepxmp>
</step>
</steps>
<result><p>The socket is explicitly bound to the specific IP address of the
network interface connection. </p> </result>
<example><title>Explicit binding example</title> <p>Client A creates a socket
with explicit binding using the specified interface connection. </p> <codeblock id="GUID-8CE9B83F-0091-5230-8F80-C27793E86437" xml:space="preserve">sock1 = RSocket.Open(srv,conn);</codeblock> <p>ESock
creates the socket within the default connection and subconnection. </p> <fig id="GUID-BE26EF30-B103-5C3B-95A8-7ED66ECFE44C">
<image href="GUID-B21A4858-162A-50F1-8F88-4259B7F7238E_d0e113898_href.png" placement="inline"/>
</fig> </example>
<postreq><p>A socket can also be opened over a sub-connection using <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref>.
When the socket is opened, a new Service Access Point (SAP) is created for
the socket in <xref href="GUID-BE7D196E-357B-36BE-80BB-CCBBE00DFA90.dita"><apiname>ESock</apiname></xref>. The SAP is used to handle inbound
and outbound data. </p> </postreq>
</taskbody></task>