URL2IP

Action

This function returns the IP address of an URL.

 

 

Syntax

ip=URL2IP(URL)

 

 

Remarks

This function performs a DNS query to the google DNS server with address 8.8.8.8.

It returns either a 0 IP address or the IP address of the URL.

 

The URL must be a string or string constant.

At the moment, this function is only supported by the W5100 and W5200.

 

 

 

See also

CONFIG TCPIP, GETSOCKET , SOCKETCONNECT, SOCKETSTAT , TCPWRITE, TCPWRITESTR, CLOSESOCKET , SOCKETLISTEN , BASE64ENC

 

 

 

Example

'-----------------------------------------------------------------------------------------
'name : PING_SPI.bas http://www.faqs.org/rfcs/rfc792.html
'copyright : (c) 1995-2016, MCS Electronics
'purpose : Simple PING program
'micro : Mega88
'suited for demo : yes
'commercial addon needed : no
'-----------------------------------------------------------------------------------------
$regfile = "m88def.dat" ' specify the used micro
 
$crystal = 8000000 ' used crystal frequency
$baud = 19200 ' use baud rate
$hwstack = 80 ' default use 64 for the hardware stack
$swstack = 64 ' default use 64 for the SW stack
$framesize = 180 ' default use 80 for the frame space
 
 
Const Cdebug = 1
 
Config Com1 = Dummy , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
 
 
'Configuration Of The SPI bus
Config Spi = Hard , Interrupt = Off , Data_order = Msb , Master = Yes , Polarity = Low , Phase = 0 , Clockrate = 4 , Noss = 0
'Init the spi pins
Spiinit
 
 
'we do the usual
Print "Init TCP" ' display a message
Enable Interrupts ' before we use config tcpip , we need to enable the interrupts
Config Tcpip = Noint , Mac = 12.128.12.34.56.78 , Ip = 192.168.1.70 , Submask = 255.255.255.0 , Gateway = 192.168.1.1 , Localport = 1000 , Tx = $55 , Rx = $55 , Chip = W5100 , Spi = 1 , Cs = Portb.2
Print "Init done"
 
Dim Idx As Byte , Result As Word , J As Byte , Res As Byte
Dim Ip As Long
Dim Dta(12) As Byte , Rec(12) As Byte
 
 
Dta(1) = 8 'type is echo
Dta(2) = 0 'code
 
Dta(3) = 0 ' for checksum initialization
Dta(4) = 0 ' checksum
Dta(5) = 0 ' a signature can be any number
Dta(6) = 1 ' signature
Dta(7) = 0 ' sequence number - any number
Dta(8) = 1
Dta(9) = 65
 
Dim W As Word At Dta(1) + 2 Overlay 'same as dta(3) and dta(4)
Dim B As Byte
W = Tcpchecksum(dta(1) , 9) ' calculate checksum and store in dta(3) and dta(4)
 
#if Cdebug
For J = 1 To 9
 Print Dta(j)
Next
#endif
 
Ip = Url2ip( "mcselec.com")
Print Ip2str(ip)
If Ip = 0 Then End
 
 
Print "Socket " ; Idx ; " " ; Idx
Setipprotocol Idx , 1 'set protocol to 1
'the protocol value must be set BEFORE the socket is openend
 
Idx = Getsocket(idx , 3 , 5000 , 0)
 
Do
' Result = Gettcpregs(&H403 , 2) : Print Hex(result)
 
' Print Hex(s_status(1))
 Result = Udpwrite(ip , 7 , Idx , Dta(1) , 9) 'write ping data '
 Print "W:" ; Result
 Waitms 300 ' depending on the hops, speed, etc
 Result = Socketstat(idx , Sel_recv) 'check for data
 Print "REC:" ; Result
 If Result >= 11 Then
 Print "Ok"
 Res = Tcpread(idx , Rec(1) , Result) 'get data with TCPREAD !!!
 #if Cdebug
 Print "DATA RETURNED :" ; Res '
 For J = 1 To Result
 Print Rec(j) ; " " ;
 Next
 Print
 #endif
 Else 'there might be a problem
 Print "Network not available"
 End If
 Waitms 10000
Loop

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