From: daz <dooby@...10.karoo.co.uk>
Date: 2005-09-30T14:36:45+09:00
Subject: Re: Win32API question


PWR wrote:
> I am trying to use Ruby's Win32API interface to access the windows file
> i/o in order to make a serial port connection. However the code below
> gives the error '[BUG] Segmentation fault' when GetOverlappedResult()
> is called. Any ideas would be gratefully received.

Yeh; what Wayne and Greg said.  Here are my changes:

> ReadFile = Win32API.new("Kernel32","ReadFile","LPLLP","N")
  ReadFile = Win32API.new('Kernel32','ReadFile','LPLPP','I')

> WriteFile = Win32API.new("Kernel32","WriteFile","LPLLP","N")
  WriteFile = Win32API.new('Kernel32','WriteFile','LPLPP','I')

> GetOverlappedResult =  Win32API.new("Kernel32","GetOverlappedResult", "LPLL", "L")
  GetOverlappedResult =  Win32API.new('Kernel32','GetOverlappedResult', 'LPPI', 'I')

> numwritten = 0
  numwritten = "\0"*4

> # Write to com port
> WriteFile.Call(hFile,outbuff,outbuff.size,numwritten,overlapped_write);report

#-> reports ... [997, "Overlapped I/O operation is in progress. "]
#->  ... but continues ... (nothing attached to COM1)


daz
-- 

> GetLastError = Win32API.new("Kernel32", "GetLastError", "V", "N")
#-> ... com1_serial.rb: 18: warning: unknown type 'V'
  GetLastError = Win32API.new('Kernel32', 'GetLastError', '',  'L')