Package com.sun.jna.platform.win32

Class WinBase.COMMTIMEOUTS

java.lang.Object

com.sun.jna.Structure

com.sun.jna.platform.win32.WinBase.COMMTIMEOUTS

Enclosing interface:

WinBase

@FieldOrder({"ReadIntervalTimeout","ReadTotalTimeoutMultiplier","ReadTotalTimeoutConstant","WriteTotalTimeoutMultiplier","WriteTotalTimeoutConstant"})
public static class WinBase.COMMTIMEOUTS
extends Structure

Contains the time-out parameters for a communications device. The parameters determine the behavior of Kernel32.ReadFile(com.sun.jna.platform.win32.WinNT.HANDLE, byte[], int, com.sun.jna.ptr.IntByReference, com.sun.jna.platform.win32.WinBase.OVERLAPPED), Kernel32.WriteFile(com.sun.jna.platform.win32.WinNT.HANDLE, byte[], int, com.sun.jna.ptr.IntByReference, com.sun.jna.platform.win32.WinBase.OVERLAPPED), ReadFileEx, and WriteFileEx operations on the device.
Remarks
If an application sets ReadIntervalTimeout and ReadTotalTimeoutMultiplier to MAXDWORD and sets ReadTotalTimeoutConstant to a value greater than zero and less than MAXDWORD, one of the following occurs when the ReadFile function is called:

If there are any bytes in the input buffer, ReadFile returns immediately with the bytes in the buffer. If there are no bytes in the input buffer, ReadFile waits until a byte arrives and then returns immediately. If no bytes arrive within the time specified by ReadTotalTimeoutConstant, ReadFile times out.

Author:

Markus

Nested Class Summary

Nested classes/interfaces inherited from class com.sun.jna.Structure

Structure.ByReference, Structure.ByValue, Structure.FieldOrder, Structure.StructField

Field Summary

Fields

Modifier and Type	Field	Description
WinDef.DWORD	ReadIntervalTimeout	The maximum time allowed to elapse before the arrival of the next byte on the communications line, in milliseconds.
WinDef.DWORD	ReadTotalTimeoutConstant	A constant used to calculate the total time-out period for read operations, in milliseconds.
WinDef.DWORD	ReadTotalTimeoutMultiplier	The multiplier used to calculate the total time-out period for read operations, in milliseconds.
WinDef.DWORD	WriteTotalTimeoutConstant	A constant used to calculate the total time-out period for write operations, in milliseconds.
WinDef.DWORD	WriteTotalTimeoutMultiplier	The multiplier used to calculate the total time-out period for write operations, in milliseconds.

Fields inherited from class com.sun.jna.Structure

ALIGN_DEFAULT, ALIGN_GNUC, ALIGN_MSVC, ALIGN_NONE, CALCULATE_SIZE

Constructor Summary

Constructors

Constructor	Description
COMMTIMEOUTS()

Method Summary

Methods inherited from class com.sun.jna.Structure

allocateMemory, allocateMemory, autoAllocate, autoRead, autoRead, autoWrite, autoWrite, cacheTypeInfo, calculateSize, clear, createFieldsOrder, createFieldsOrder, createFieldsOrder, createFieldsOrder, dataEquals, dataEquals, ensureAllocated, equals, fieldOffset, getAutoRead, getAutoWrite, getFieldList, getFieldOrder, getFields, getNativeAlignment, getNativeSize, getNativeSize, getPointer, getStringEncoding, getStructAlignment, hashCode, newInstance, newInstance, read, readField, readField, setAlignType, setAutoRead, setAutoSynch, setAutoWrite, setStringEncoding, size, sortFields, toArray, toArray, toString, toString, useMemory, useMemory, write, writeField, writeField, writeField

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ReadIntervalTimeout

public WinDef.DWORD ReadIntervalTimeout

The maximum time allowed to elapse before the arrival of the next byte on the communications line, in milliseconds. If the interval between the arrival of any two bytes exceeds this amount, the Kernel32.ReadFile(com.sun.jna.platform.win32.WinNT.HANDLE, byte[], int, com.sun.jna.ptr.IntByReference, com.sun.jna.platform.win32.WinBase.OVERLAPPED) operation is completed and any buffered data is returned. A value of zero indicates that interval time-outs are not used. A value of MAXDWORD, combined with zero values for both the ReadTotalTimeoutConstant and ReadTotalTimeoutMultiplier members, specifies that the read operation is to return immediately with the bytes that have already been received, even if no bytes have been received.

ReadTotalTimeoutMultiplier

public WinDef.DWORD ReadTotalTimeoutMultiplier

The multiplier used to calculate the total time-out period for read operations, in milliseconds. For each read operation, this value is multiplied by the requested number of bytes to be read.

ReadTotalTimeoutConstant

public WinDef.DWORD ReadTotalTimeoutConstant

A constant used to calculate the total time-out period for read operations, in milliseconds. For each read operation, this value is added to the product of the ReadTotalTimeoutMultiplier member and the requested number of bytes. A value of zero for both the ReadTotalTimeoutMultiplier and ReadTotalTimeoutConstant members indicates that total time-outs are not used for read operations.

WriteTotalTimeoutMultiplier

public WinDef.DWORD WriteTotalTimeoutMultiplier

The multiplier used to calculate the total time-out period for write operations, in milliseconds. For each write operation, this value is multiplied by the number of bytes to be written.

WriteTotalTimeoutConstant

public WinDef.DWORD WriteTotalTimeoutConstant

A constant used to calculate the total time-out period for write operations, in milliseconds. For each write operation, this value is added to the product of the WriteTotalTimeoutMultiplier member and the number of bytes to be written. A value of zero for both the WriteTotalTimeoutMultiplier and WriteTotalTimeoutConstant members indicates that total time-outs are not used for write operations.

Constructor Detail

COMMTIMEOUTS

public COMMTIMEOUTS()