jtermios.windows

Class WinAPI

java.lang.Object

jtermios.windows.WinAPI

public class WinAPI
extends java.lang.Object

This WinAPI class implements a simple wrapper API to access the Windows COM ports from Java. The purpose is to follow reasonably closely the WIN32 API so that COM port related C-code can be ported to Java almost as-is with little changes when this class is statically imported.

This is a pure lightweight wrapper around WIN32 API calls with no added syntactic sugar, functionality or niceties.

Here is a rude example:

 
 import static jtermios.windows.WinAPI.*;
 ...
    byte[] buffer = "Hello World".getBytes();
    HANDLE hcomm = CreateFileA( "COM5:", GENERIC_READ |GENERIC_WRITE, 0, null, 0, 0, null );
    int[] wrtn = {0};
    WriteFile(hcomm, buffer, buffer.length, wrtn);
    CloseHandle(hcomm);
 
 

Can't get much closer to C-code, what!

In addition to the basic open/close/read/write and setup operations this class also makes available enough of the WIN32 Event API to make it possible to use overlapped (asynchronous) I/O on COM ports.

Note that overlapped IO API is full of fine print. Especially worth mentioning is that the OVERLAPPED structure cannot use autosync as it is modified (by Windows) outside the function calls that use it. OVERLAPPED takes care of not autosyncing but it is best to us the writeField() methods to set fields of OVERLAPPED.

 
    OVERLAPPED ovl = new OVERLAPPED();
    ovl.writeField("hEvent",CreateEvent(null, true, false, null));
   ...
    WriteFile(hComm, txm, txb.length, txn, ovl);
   ...
    GetOverlappedResult(hComm, ovl, txn, true);
 
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	WinAPI.COMMTIMEOUTS
static class	WinAPI.COMSTAT
static class	WinAPI.DCB
static class	WinAPI.HANDLE
static class	WinAPI.OVERLAPPED Represent the Windows API struct OVERLAPPED.
static class	WinAPI.SECURITY_ATTRIBUTES
static class	WinAPI.ULONG_PTR
static interface	WinAPI.WaitMultiple
static interface	WinAPI.Windows_kernel32_lib
static class	WinAPI.Windows_kernel32_lib_Direct

Field Summary

Fields

Modifier and Type	Field and Description
static int	CBR_110
static int	CBR_115200
static int	CBR_1200
static int	CBR_128000
static int	CBR_14400
static int	CBR_19200
static int	CBR_2400
static int	CBR_256000
static int	CBR_300
static int	CBR_38400
static int	CBR_4800
static int	CBR_56000
static int	CBR_57600
static int	CBR_600
static int	CBR_9600
static int	CE_BREAK
static int	CE_DNS
static int	CE_FRAME
static int	CE_IOE
static int	CE_MODE
static int	CE_OOP
static int	CE_OVERRUN
static int	CE_PTO
static int	CE_RXOVER
static int	CE_RXPARITY
static int	CE_TXFULL
static int	CLRBREAK
static int	CLRDTR
static int	CLRRTS
static int	CREATE_ALWAYS
static int	CREATE_NEW
static int	ERROR_BROKEN_PIPE
static int	ERROR_FILE_NOT_FOUND
static int	ERROR_INSUFFICIENT_BUFFER
static int	ERROR_INVALID_PARAMETER
static int	ERROR_IO_INCOMPLETE
static int	ERROR_IO_PENDING
static int	ERROR_MORE_DATA
static int	ERROR_OPERATION_ABORTED
static int	EV_BREAK
static int	EV_CTS
static int	EV_DSR
static int	EV_ERR
static int	EV_EVENT1
static int	EV_EVENT2
static int	EV_PERR
static int	EV_RING
static int	EV_RLSD
static int	EV_RX80FULL
static int	EV_RXCHAR
static int	EV_RXFLAG
static int	EV_TXEMPTY
static byte	EVENPARITY
static int	FILE_FLAG_BACKUP_SEMANTICS
static int	FILE_FLAG_DELETE_ON_CLOSE
static int	FILE_FLAG_FIRST_PIPE_INSTANCE
static int	FILE_FLAG_NO_BUFFERING
static int	FILE_FLAG_OPEN_NO_RECALL
static int	FILE_FLAG_OPEN_REPARSE_POINT
static int	FILE_FLAG_OVERLAPPED
static int	FILE_FLAG_POSIX_SEMANTICS
static int	FILE_FLAG_RANDOM_ACCESS
static int	FILE_FLAG_SEQUENTIAL_SCAN
static int	FILE_FLAG_WRITE_THROUGH
static int	FORMAT_MESSAGE_ALLOCATE_BUFFER
static int	FORMAT_MESSAGE_ARGUMENT_ARRAY
static int	FORMAT_MESSAGE_FROM_HMODULE
static int	FORMAT_MESSAGE_FROM_STRING
static int	FORMAT_MESSAGE_FROM_SYSTEM
static int	FORMAT_MESSAGE_IGNORE_INSERTS
static int	FORMAT_MESSAGE_MAX_WIDTH_MASK
static int	GENERIC_ALL
static int	GENERIC_EXECUTE
static int	GENERIC_READ
static int	GENERIC_WRITE
static int	IE_BADID
static int	IE_BAUDRATE
static int	IE_BYTESIZE
static int	IE_DEFAULT
static int	IE_HARDWARE
static int	IE_MEMORY
static int	IE_NOPEN
static int	IE_OPEN
static int	INFINITE
static WinAPI.HANDLE	INVALID_HANDLE_VALUE
static int	LANG_NEUTRAL
static byte	MARKPARITY
static int	MAXDWORD
static int	MS_CTS_ON
static int	MS_DSR_ON
static int	MS_RING_ON
static int	MS_RLSD_ON
static byte	NOPARITY
static WinAPI.HANDLE	NULL
static byte	ODDPARITY
static byte	ONE5STOPBITS
static byte	ONESTOPBIT
static int	OPEN_ALWAYS
static int	OPEN_EXISTING
static int	PURGE_RXABORT
static int	PURGE_RXCLEAR
static int	PURGE_TXABORT
static int	PURGE_TXCLEAR
static int	RESETDEV
static int	SETBREAK
static int	SETDTR
static int	SETRTS
static int	SETXOFF
static int	SETXON
static byte	SPACEPARITY
static int	STATUS_ABANDONED_WAIT_0
static int	STATUS_WAIT_0
static int	SUBLANG_DEFAULT
static int	TRUNCATE_EXISTING
static byte	TWOSTOPBITS
static int	WAIT_ABANDONED
static int	WAIT_ABANDONED_0
static int	WAIT_FAILED
static int	WAIT_OBJECT_0
static int	WAIT_TIMEOUT

Constructor Summary

Constructors

Constructor and Description
WinAPI()

Method Summary

Modifier and Type	Method and Description
static boolean	CancelIo(WinAPI.HANDLE hFile)
static boolean	ClearCommBreak(WinAPI.HANDLE hFile)
static boolean	ClearCommError(WinAPI.HANDLE hFile, int[] n, WinAPI.COMSTAT s)
static boolean	CloseHandle(WinAPI.HANDLE hFile)
static WinAPI.HANDLE	CreateEvent(WinAPI.SECURITY_ATTRIBUTES security, boolean manual, boolean initial, java.lang.String name)
static WinAPI.HANDLE	CreateFile(java.lang.String name, int access, int sharing, WinAPI.SECURITY_ATTRIBUTES security, int create, int attribs, com.sun.jna.Pointer template)
static boolean	EscapeCommFunction(WinAPI.HANDLE hFile, int func)
static boolean	FlushFileBuffers(WinAPI.HANDLE hFile)
static int	FormatMessageW(int flags, com.sun.jna.Pointer src, int msgId, int langId, com.sun.jna.Pointer dst, int sze, com.sun.jna.Pointer va_list)
static boolean	GetCommMask(WinAPI.HANDLE hFile, int[] mask)
static boolean	GetCommModemStatus(WinAPI.HANDLE hFile, int[] stat)
static boolean	GetCommState(WinAPI.HANDLE hFile, WinAPI.DCB dcb)
static int	GetLastError()
static boolean	GetOverlappedResult(WinAPI.HANDLE hFile, WinAPI.OVERLAPPED ovl, int[] ntfrd, boolean wait)
static int	MAKELANGID(int p, int s)
static boolean	PurgeComm(WinAPI.HANDLE hFile, int qmask)
static int	QueryDosDevice(java.lang.String name, byte[] buffer, int bsize)
static boolean	ReadFile(WinAPI.HANDLE hFile, byte[] buf, int rdn, int[] nrd)
static boolean	ReadFile(WinAPI.HANDLE hFile, com.sun.jna.Pointer buf, int rdn, int[] nrd, WinAPI.OVERLAPPED ovrlp)
static boolean	ResetEvent(WinAPI.HANDLE hEvent)
static boolean	SetCommBreak(WinAPI.HANDLE hFile)
static boolean	SetCommMask(WinAPI.HANDLE hFile, int mask)
static boolean	SetCommState(WinAPI.HANDLE hFile, WinAPI.DCB dcb)
static boolean	SetCommTimeouts(WinAPI.HANDLE hFile, WinAPI.COMMTIMEOUTS touts)
static boolean	SetEvent(WinAPI.HANDLE hEvent)
static boolean	SetupComm(WinAPI.HANDLE hFile, int inQueueSz, int outQueueSz)
static boolean	WaitCommEvent(WinAPI.HANDLE hFile, int[] lpEvtMask)
static boolean	WaitCommEvent(WinAPI.HANDLE hFile, com.sun.jna.ptr.IntByReference lpEvtMask, WinAPI.OVERLAPPED ovl)
static int	WaitForMultipleObjects(int nCount, WinAPI.HANDLE[] lpHandles, boolean bWaitAll, int dwMilliseconds)
static int	WaitForSingleObject(WinAPI.HANDLE hHandle, int dwMilliseconds)
static boolean	WriteFile(WinAPI.HANDLE hFile, byte[] buf, int wrn, int[] nwrtn)
static boolean	WriteFile(WinAPI.HANDLE hFile, com.sun.jna.Pointer buf, int wrn, int[] nwrtn, WinAPI.OVERLAPPED ovrlp)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INVALID_HANDLE_VALUE

public static WinAPI.HANDLE INVALID_HANDLE_VALUE

NULL

public static WinAPI.HANDLE NULL

ERROR_INSUFFICIENT_BUFFER

public static final int ERROR_INSUFFICIENT_BUFFER

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Constant Field Values

MAXDWORD

public static final int MAXDWORD

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Constant Field Values

STATUS_WAIT_0

public static final int STATUS_WAIT_0

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STATUS_ABANDONED_WAIT_0

public static final int STATUS_ABANDONED_WAIT_0

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WAIT_ABANDONED

public static final int WAIT_ABANDONED

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WAIT_ABANDONED_0

public static final int WAIT_ABANDONED_0

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WAIT_OBJECT_0

public static final int WAIT_OBJECT_0

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WAIT_FAILED

public static final int WAIT_FAILED

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INFINITE

public static final int INFINITE

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WAIT_TIMEOUT

public static final int WAIT_TIMEOUT

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Constant Field Values

GENERIC_READ

public static final int GENERIC_READ

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GENERIC_WRITE

public static final int GENERIC_WRITE

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GENERIC_EXECUTE

public static final int GENERIC_EXECUTE

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GENERIC_ALL

public static final int GENERIC_ALL

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CREATE_NEW

public static final int CREATE_NEW

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CREATE_ALWAYS

public static final int CREATE_ALWAYS

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OPEN_EXISTING

public static final int OPEN_EXISTING

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OPEN_ALWAYS

public static final int OPEN_ALWAYS

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TRUNCATE_EXISTING

public static final int TRUNCATE_EXISTING

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PURGE_TXABORT

public static final int PURGE_TXABORT

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PURGE_RXABORT

public static final int PURGE_RXABORT

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PURGE_TXCLEAR

public static final int PURGE_TXCLEAR

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PURGE_RXCLEAR

public static final int PURGE_RXCLEAR

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MS_CTS_ON

public static final int MS_CTS_ON

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MS_DSR_ON

public static final int MS_DSR_ON

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MS_RING_ON

public static final int MS_RING_ON

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MS_RLSD_ON

public static final int MS_RLSD_ON

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SETXOFF

public static final int SETXOFF

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SETXON

public static final int SETXON

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SETRTS

public static final int SETRTS

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CLRRTS

public static final int CLRRTS

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SETDTR

public static final int SETDTR

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CLRDTR

public static final int CLRDTR

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RESETDEV

public static final int RESETDEV

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SETBREAK

public static final int SETBREAK

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CLRBREAK

public static final int CLRBREAK

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FILE_FLAG_WRITE_THROUGH

public static final int FILE_FLAG_WRITE_THROUGH

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FILE_FLAG_OVERLAPPED

public static final int FILE_FLAG_OVERLAPPED

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FILE_FLAG_NO_BUFFERING

public static final int FILE_FLAG_NO_BUFFERING

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FILE_FLAG_RANDOM_ACCESS

public static final int FILE_FLAG_RANDOM_ACCESS

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FILE_FLAG_SEQUENTIAL_SCAN

public static final int FILE_FLAG_SEQUENTIAL_SCAN

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FILE_FLAG_DELETE_ON_CLOSE

public static final int FILE_FLAG_DELETE_ON_CLOSE

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FILE_FLAG_BACKUP_SEMANTICS

public static final int FILE_FLAG_BACKUP_SEMANTICS

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FILE_FLAG_POSIX_SEMANTICS

public static final int FILE_FLAG_POSIX_SEMANTICS

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FILE_FLAG_OPEN_REPARSE_POINT

public static final int FILE_FLAG_OPEN_REPARSE_POINT

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FILE_FLAG_OPEN_NO_RECALL

public static final int FILE_FLAG_OPEN_NO_RECALL

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FILE_FLAG_FIRST_PIPE_INSTANCE

public static final int FILE_FLAG_FIRST_PIPE_INSTANCE

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ERROR_OPERATION_ABORTED

public static final int ERROR_OPERATION_ABORTED

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ERROR_IO_INCOMPLETE

public static final int ERROR_IO_INCOMPLETE

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ERROR_IO_PENDING

public static final int ERROR_IO_PENDING

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ERROR_INVALID_PARAMETER

public static final int ERROR_INVALID_PARAMETER

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ERROR_BROKEN_PIPE

public static final int ERROR_BROKEN_PIPE

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ERROR_MORE_DATA

public static final int ERROR_MORE_DATA

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ERROR_FILE_NOT_FOUND

public static final int ERROR_FILE_NOT_FOUND

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NOPARITY

public static final byte NOPARITY

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ODDPARITY

public static final byte ODDPARITY

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EVENPARITY

public static final byte EVENPARITY

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MARKPARITY

public static final byte MARKPARITY

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SPACEPARITY

public static final byte SPACEPARITY

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ONESTOPBIT

public static final byte ONESTOPBIT

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ONE5STOPBITS

public static final byte ONE5STOPBITS

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TWOSTOPBITS

public static final byte TWOSTOPBITS

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CBR_110

public static final int CBR_110

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CBR_300

public static final int CBR_300

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CBR_600

public static final int CBR_600

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CBR_1200

public static final int CBR_1200

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CBR_2400

public static final int CBR_2400

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CBR_4800

public static final int CBR_4800

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CBR_9600

public static final int CBR_9600

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CBR_14400

public static final int CBR_14400

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CBR_19200

public static final int CBR_19200

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CBR_38400

public static final int CBR_38400

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CBR_56000

public static final int CBR_56000

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CBR_57600

public static final int CBR_57600

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CBR_115200

public static final int CBR_115200

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CBR_128000

public static final int CBR_128000

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CBR_256000

public static final int CBR_256000

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CE_RXOVER

public static final int CE_RXOVER

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CE_OVERRUN

public static final int CE_OVERRUN

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CE_RXPARITY

public static final int CE_RXPARITY

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CE_FRAME

public static final int CE_FRAME

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CE_BREAK

public static final int CE_BREAK

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CE_TXFULL

public static final int CE_TXFULL

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CE_PTO

public static final int CE_PTO

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CE_IOE

public static final int CE_IOE

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CE_DNS

public static final int CE_DNS

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CE_OOP

public static final int CE_OOP

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CE_MODE

public static final int CE_MODE

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IE_BADID

public static final int IE_BADID

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IE_OPEN

public static final int IE_OPEN

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IE_NOPEN

public static final int IE_NOPEN

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IE_MEMORY

public static final int IE_MEMORY

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IE_DEFAULT

public static final int IE_DEFAULT

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IE_HARDWARE

public static final int IE_HARDWARE

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IE_BYTESIZE

public static final int IE_BYTESIZE

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IE_BAUDRATE

public static final int IE_BAUDRATE

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EV_RXCHAR

public static final int EV_RXCHAR

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EV_RXFLAG

public static final int EV_RXFLAG

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EV_TXEMPTY

public static final int EV_TXEMPTY

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EV_CTS

public static final int EV_CTS

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EV_DSR

public static final int EV_DSR

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EV_RLSD

public static final int EV_RLSD

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EV_BREAK

public static final int EV_BREAK

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EV_ERR

public static final int EV_ERR

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EV_RING

public static final int EV_RING

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EV_PERR

public static final int EV_PERR

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EV_RX80FULL

public static final int EV_RX80FULL

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EV_EVENT1

public static final int EV_EVENT1

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EV_EVENT2

public static final int EV_EVENT2

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FORMAT_MESSAGE_ALLOCATE_BUFFER

public static final int FORMAT_MESSAGE_ALLOCATE_BUFFER

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FORMAT_MESSAGE_IGNORE_INSERTS

public static final int FORMAT_MESSAGE_IGNORE_INSERTS

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FORMAT_MESSAGE_FROM_STRING

public static final int FORMAT_MESSAGE_FROM_STRING

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FORMAT_MESSAGE_FROM_HMODULE

public static final int FORMAT_MESSAGE_FROM_HMODULE

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FORMAT_MESSAGE_FROM_SYSTEM

public static final int FORMAT_MESSAGE_FROM_SYSTEM

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FORMAT_MESSAGE_ARGUMENT_ARRAY

public static final int FORMAT_MESSAGE_ARGUMENT_ARRAY

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FORMAT_MESSAGE_MAX_WIDTH_MASK

public static final int FORMAT_MESSAGE_MAX_WIDTH_MASK

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LANG_NEUTRAL

public static final int LANG_NEUTRAL

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SUBLANG_DEFAULT

public static final int SUBLANG_DEFAULT

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Constructor Detail

WinAPI

public WinAPI()

Method Detail

MAKELANGID

public static int MAKELANGID(int p,
                             int s)

CreateFile

public static WinAPI.HANDLE CreateFile(java.lang.String name,
                                       int access,
                                       int sharing,
                                       WinAPI.SECURITY_ATTRIBUTES security,
                                       int create,
                                       int attribs,
                                       com.sun.jna.Pointer template)

WriteFile

public static boolean WriteFile(WinAPI.HANDLE hFile,
                                byte[] buf,
                                int wrn,
                                int[] nwrtn)

WriteFile

public static boolean WriteFile(WinAPI.HANDLE hFile,
                                com.sun.jna.Pointer buf,
                                int wrn,
                                int[] nwrtn,
                                WinAPI.OVERLAPPED ovrlp)

ReadFile

public static boolean ReadFile(WinAPI.HANDLE hFile,
                               byte[] buf,
                               int rdn,
                               int[] nrd)

ReadFile

public static boolean ReadFile(WinAPI.HANDLE hFile,
                               com.sun.jna.Pointer buf,
                               int rdn,
                               int[] nrd,
                               WinAPI.OVERLAPPED ovrlp)

FlushFileBuffers

public static boolean FlushFileBuffers(WinAPI.HANDLE hFile)

PurgeComm

public static boolean PurgeComm(WinAPI.HANDLE hFile,
                                int qmask)

CancelIo

public static boolean CancelIo(WinAPI.HANDLE hFile)

CloseHandle

public static boolean CloseHandle(WinAPI.HANDLE hFile)

ClearCommError

public static boolean ClearCommError(WinAPI.HANDLE hFile,
                                     int[] n,
                                     WinAPI.COMSTAT s)

SetCommMask

public static boolean SetCommMask(WinAPI.HANDLE hFile,
                                  int mask)

GetCommMask

public static boolean GetCommMask(WinAPI.HANDLE hFile,
                                  int[] mask)

GetCommState

public static boolean GetCommState(WinAPI.HANDLE hFile,
                                   WinAPI.DCB dcb)

SetCommState

public static boolean SetCommState(WinAPI.HANDLE hFile,
                                   WinAPI.DCB dcb)

SetCommTimeouts

public static boolean SetCommTimeouts(WinAPI.HANDLE hFile,
                                      WinAPI.COMMTIMEOUTS touts)

SetupComm

public static boolean SetupComm(WinAPI.HANDLE hFile,
                                int inQueueSz,
                                int outQueueSz)

SetCommBreak

public static boolean SetCommBreak(WinAPI.HANDLE hFile)

ClearCommBreak

public static boolean ClearCommBreak(WinAPI.HANDLE hFile)

GetCommModemStatus

public static boolean GetCommModemStatus(WinAPI.HANDLE hFile,
                                         int[] stat)

EscapeCommFunction

public static boolean EscapeCommFunction(WinAPI.HANDLE hFile,
                                         int func)

CreateEvent

public static WinAPI.HANDLE CreateEvent(WinAPI.SECURITY_ATTRIBUTES security,
                                        boolean manual,
                                        boolean initial,
                                        java.lang.String name)

SetEvent

public static boolean SetEvent(WinAPI.HANDLE hEvent)

ResetEvent

public static boolean ResetEvent(WinAPI.HANDLE hEvent)

WaitCommEvent

public static boolean WaitCommEvent(WinAPI.HANDLE hFile,
                                    com.sun.jna.ptr.IntByReference lpEvtMask,
                                    WinAPI.OVERLAPPED ovl)

WaitCommEvent

public static boolean WaitCommEvent(WinAPI.HANDLE hFile,
                                    int[] lpEvtMask)

WaitForSingleObject

public static int WaitForSingleObject(WinAPI.HANDLE hHandle,
                                      int dwMilliseconds)

WaitForMultipleObjects

public static int WaitForMultipleObjects(int nCount,
                                         WinAPI.HANDLE[] lpHandles,
                                         boolean bWaitAll,
                                         int dwMilliseconds)

GetOverlappedResult

public static boolean GetOverlappedResult(WinAPI.HANDLE hFile,
                                          WinAPI.OVERLAPPED ovl,
                                          int[] ntfrd,
                                          boolean wait)

GetLastError

public static int GetLastError()

FormatMessageW

public static int FormatMessageW(int flags,
                                 com.sun.jna.Pointer src,
                                 int msgId,
                                 int langId,
                                 com.sun.jna.Pointer dst,
                                 int sze,
                                 com.sun.jna.Pointer va_list)

QueryDosDevice

public static int QueryDosDevice(java.lang.String name,
                                 byte[] buffer,
                                 int bsize)