From: Shusaku <tsyk@...>
Date: 2003-01-07T11:13:21+09:00
Subject: Re: Windows Serial Port


On Mon, 06 Jan 2003 20:51:47 GMT
Travis Whitton <whitton@atlantic.net> wrote:

> Is there a way to access the serial port using Ruby and Windows? If so,
> can someone point me to some examples?


require 'Win32API'

NULL = 0
GENERIC_READ  = 0x80000000
GENERIC_WRITE = 0x40000000
OPEN_EXISTING = 3

fCreateFile = Win32API.new("kernel32", "CreateFileA", 'PLLLLLL', 'L')
fWriteFile = Win32API.new("kernel32", "WriteFile", 'LPLPL', 'L')
fReadFile = Win32API.new("kernel32", "ReadFile", 'LPLPL', 'L')

hCom = fCreateFile.call("COM3", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL)

ptxBytes = [0].pack("L")
prxBytes = [0].pack("L")

txBuffer = "ATZ\r"
rxBuffer = " " * 256

nRet = fWriteFile.call(hCom, txBuffer, txBuffer.size, ptxBytes, NULL)
txBytes = ptxBytes.unpack("L")[0]   #=> 4

nRet = fReadFile.call(hCom, rxBuffer, rxBuffer.size, prxBytes, NULL)
rxBytes = prxBytes.unpack("L")[0]   #=> 10

rxBuffer[0...rxBytes]               #=> "ATZ\r\r\nOK\r\n"


-- 
Shusaku <tsyk@yk.rim.or.jp>