PBXB64 Networking

TCP & UDP Standard

Full TCP and UDP networking with TCP OPEN/CLOSE/SEND/RECV/LISTEN/ACCEPT and UDP OPEN/CLOSE/SEND/RECV. Build servers, clients, and peer-to-peer applications. Real Win32 socket API (WSAStartup, socket, bind, listen, accept, send, recv).

TCP Client & Server

TCP client example

#COMPILE EXE #DIM ALL FUNCTION PBMAIN() AS LONG LOCAL buffer AS STRING ' Connect to server (host is given after AT, 3 s send/receive timeout) TCP OPEN PORT 8080 AT "192.168.1.1" AS #1 TIMEOUT 3000 ' Send data TCP SEND #1, "Hello Server" ' Receive response (up to 1024 bytes in one call) TCP RECV #1, 1024, buffer PRINT "Server said: "; buffer TCP CLOSE #1 FUNCTION = 0 END FUNCTION

TCP OPEN PORT n AT host AS #1 TIMEOUT ms creates a client connection. TCP SEND sends a string. TCP RECV #1, count, buf receives up to count bytes. TCP CLOSE releases the socket. TCP LISTEN/ACCEPT for server-side.

UDP - Connectionless

UDP send/receive

#COMPILE EXE #DIM ALL FUNCTION PBMAIN() AS LONG LOCAL buffer AS STRING LOCAL peerAddr AS QUAD LOCAL peerPort AS QUAD LOCAL dest AS QUAD ' Open UDP socket bound to local port 5000 (3 s timeout) UDP OPEN PORT 5000 AS #1 TIMEOUT 3000 ' Send to peer: address comes from HOST ADDR, port 5001 HOST ADDR "192.168.1.2" TO dest UDP SEND #1, AT dest, 5001, "Hello UDP!" ' Receive from any peer: sender address and port are returned UDP RECV #1, FROM peerAddr, peerPort, buffer PRINT "Got: "; buffer; " from port "; peerPort UDP CLOSE #1 FUNCTION = 0 END FUNCTION

UDP is connectionless - each send specifies the destination address and port; the packed address comes from HOST ADDR. UDP RECV ... FROM addr, port, buf returns the sender address and port. Ideal for discovery, streaming, and lightweight protocols.

HOST ADDR / HOST NAME

DNS resolution

#COMPILE EXE #DIM ALL FUNCTION PBMAIN() AS LONG LOCAL ip AS QUAD ' packed IPv4 value LOCAL name AS STRING HOST ADDR "smart-ai-robot.com" TO ip PRINT "IP: "; (ip AND 255); "."; ((ip \ 256) AND 255); "."; _ ((ip \ 65536) AND 255); "."; ((ip \ 16777216) AND 255) HOST NAME ip TO name ' reverse lookup of the packed address PRINT "Name: "; name HOST NAME TO name ' local computer name PRINT "This computer: "; name FUNCTION = 0 END FUNCTION

HOST ADDR resolves a hostname to a packed IPv4 address. HOST NAME returns the local host name, or performs a reverse lookup when given an address. Both use real gethostbyname/getaddrinfo Win32 APIs.

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