Check if Port is open

[pkonduru]

Hi All,

I am trying to use this in my installer to see if a port is open. I need to show a message box if the port cannot be used or proceed if its ok to use the port.

http://nsis.sourceforge.net/Check_open_ports

I am not able to figure out the example in this page. If I used the condition with {If}, how would this be:

${If} ${TCPPortOpen} $PortNumber
MessageBox MB_OK|MB_ICONSTOP "$PortNumber is already using by another program..."
Abort
${Else}
MessageBox MB_OK"$PortNumber is open to use"

Is this correct?