In WINDOWS you can't directly access the hardware of the interface, a kind of method is to drive, and then write the corresponding DLL, on the basis of the written application, winio is the collection.

winio
.....\Examples
.....\........\C
.....\........\.\WinIoTest
.....\........\.\.........\Release
.....\........\.\.........\WinIo.h
.....\........\.\.........\WinIo.lib
.....\........\.\.........\WinIoTest.cpp
.....\........\.\.........\WinIoTest.dsp
.....\........\.\.........\WinIoTest.dsw
.....\........\.\.........\WinIoTest.ncb
.....\........\.\.........\WinIoTest.opt
.....\........\VB
.....\........\..\VBDumpPhys32
.....\........\..\............\MSSCCPRJ.SCC
.....\........\..\............\VBDumpPhys32.exe
.....\........\..\............\VBDumpPhys32.frm
.....\........\..\............\VBDumpPhys32.Vbp
.....\........\..\............\VBDumpPhys32.vbw
.....\........\..\............\WinIo.Bas
.....\........\..\............\WinIo.dll
.....\........\..\............\WinIo.sys
.....\........\..\............\WINIO.VXD
.....\........\..\VBDumpPort32
.....\........\..\............\MSSCCPRJ.SCC
.....\........\..\............\VBDumpPort32.exe
.....\........\..\............\VBDumpPort32.frm
.....\........\..\............\VBDumpPort32.Vbp
.....\........\..\............\VBDumpPort32.vbw
.....\........\..\............\WinIo.Bas
.....\........\..\............\WinIo.dll
.....\........\..\............\WinIo.sys
.....\........\..\............\WINIO.VXD
.....\Help
.....\....\WinIo.chm
.....\Release
.....\Source
.....\......\Dll
.....\......\...\Debug
.....\......\...\InstDrv.cpp
.....\......\...\K32Call.h
.....\......\...\k32exp.c
.....\......\...\k32exp.h
.....\......\...\Phys32.cpp
.....\......\...\Phys32.h
.....\......\...\Port32.cpp
.....\......\...\Port32.h
.....\......\...\Release
.....\......\...\resource.h
.....\......\...\WinIo.aps
.....\......\...\WinIo.cpp
.....\......\...\WinIo.def
.....\......\...\WinIo.dsp
.....\......\...\WinIo.dsw
.....\......\...\WinIo.h
.....\......\...\WinIo.ncb
.....\......\...\WinIo.opt
.....\......\...\WinIo.rc
.....\......\Drv
.....\......\...\9x
.....\......\...\..\WinIo.c
.....\......\...\..\WINIO.DEF
.....\......\...\..\WINIO.exp
.....\......\...\..\WinIo.h
.....\......\...\..\WINIO.lib
.....\......\...\..\winio.mak
.....\......\...\..\WINIO.VRC
.....\......\...\..\WINIO.VXD
.....\......\...\..\WinIo_9x.h
.....\......\...\NT
.....\......\...\..\BUILD.LOG
.....\......\...\..\I386
.....\......\...\..\....\Checked
.....\......\...\..\....\.......\WinIo.sys
.....\......\...\..\....\Free
.....\......\...\..\....\....\WinIo.sys
.....\......\...\..\MAKEFILE
.....\......\...\..\OBJ
.....\......\...\..\...\I386
.....\......\...\..\...\....\WINIO.OBJ
.....\......\...\..\...\_OBJECTS.MAC
.....\......\...\..\SOURCES
.....\......\...\..\WinIo.c
.....\......\...\..\WinIo_NT.h

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