# ACE_WIN32_Asynch_Write_File Class Reference

This class is a factory for starting off asynchronous writes on a file. More...

`#include <WIN32_Asynch_IO.h>`

Inheritance diagram for ACE_WIN32_Asynch_Write_File:

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Collaboration diagram for ACE_WIN32_Asynch_Write_File:

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List of all members.

## Public Member Functions

| ACE_WIN32_Asynch_Write_File (ACE_WIN32_Proactor *win32_proactor)
| Constructor.
int | write (ACE_Message_Block &message_block, size_t bytes_to_write, u_long offset, u_long offset_high, const void *act, int priority, int signal_number=0)
int | writev (ACE_Message_Block &message_block, size_t bytes_to_write, u_long offset, u_long offset_high, const void *act, int priority, int signal_number=0)
virtual | ~ACE_WIN32_Asynch_Write_File (void)
| Destrcutor.
int | open (const ACE_Handler::Proxy_Ptr &handler_proxy, ACE_HANDLE handle, const void *completion_key, ACE_Proactor *proactor)
int | cancel (void)
ACE_Proactor * | proactor (void) const
| Return the underlying proactor.

## Private Member Functions

int | write (ACE_Message_Block &message_block, size_t bytes_to_write, const void *act, int priority, int signal_number=0)
int | writev (ACE_Message_Block &message_block, size_t bytes_to_write, const void *act, int priority, int signal_number=0)

## Detailed Description

This class is a factory for starting off asynchronous writes on a file.

Once <open> is called, multiple asynchronous <write>s can be started using this class. A ACE_Asynch_Write_File::Result will be passed back to the <handler> when the asynchronous writes completes through the <ACE_Handler::handle_write_file> callback.

## Constructor & Destructor Documentation

ACE_WIN32_Asynch_Write_File::ACE_WIN32_Asynch_Write_File | ( | ACE_WIN32_Proactor * | win32_proactor | ) |

| Constructor.

ACE_WIN32_Asynch_Write_File::~ACE_WIN32_Asynch_Write_File | ( | void |  | ) | `[virtual]`

| Destrcutor.

## Member Function Documentation

int ACE_WIN32_Asynch_Write_File::cancel | ( | void |  | ) | `[virtual]`

| This cancels all pending accepts operations that were issued by the calling thread. The function does not cancel asynchronous operations issued by other threads. Reimplemented from ACE_WIN32_Asynch_Write_Stream.

int ACE_WIN32_Asynch_Write_File::open | ( | const ACE_Handler::Proxy_Ptr & | handler_proxy,
|  | ACE_HANDLE | handle,
|  | const void * | completion_key,
|  | ACE_Proactor * | proactor
| ) | `[virtual]`

| Initializes the factory with information which will be used with each asynchronous call. If (<handle> == ACE_INVALID_HANDLE), <ACE_Handler::handle> will be called on the <handler> to get the correct handle. Reimplemented from ACE_WIN32_Asynch_Write_Stream.

ACE_Proactor * ACE_WIN32_Asynch_Write_File::proactor | ( | void |  | ) | const`[virtual]`

| Return the underlying proactor. Reimplemented from ACE_WIN32_Asynch_Write_Stream.

int ACE_WIN32_Asynch_Write_File::write | ( | ACE_Message_Block & | message_block,
|  | size_t | bytes_to_write,
|  | const void * | act,
|  | int | priority,
|  | int | signal_number = `0`
| ) | `[private, virtual]`

| This method belongs to ACE_WIN32_Asynch_Write_Stream. It is here to avoid compiler warnings. This method is forwarded to the ACE_WIN32_Asynch_Write_Stream class. Implements ACE_Asynch_Write_File_Impl.

int ACE_WIN32_Asynch_Write_File::write | ( | ACE_Message_Block & | message_block,
|  | size_t | bytes_to_write,
|  | u_long | offset,
|  | u_long | offset_high,
|  | const void * | act,
|  | int | priority,
|  | int | signal_number = `0`
| ) | `[virtual]`

| This starts off an asynchronous write. Upto <bytes_to_write> will be write and stored in the <message_block>. The write will start at <offset> from the beginning of the file. Implements ACE_Asynch_Write_File_Impl.

int ACE_WIN32_Asynch_Write_File::writev | ( | ACE_Message_Block & | message_block,
|  | size_t | bytes_to_write,
|  | const void * | act,
|  | int | priority,
|  | int | signal_number = `0`
| ) | `[private, virtual]`

| Same as above but with gather support, through chaining of composite message blocks using the continuation field. Implements ACE_Asynch_Write_File_Impl.

int ACE_WIN32_Asynch_Write_File::writev | ( | ACE_Message_Block & | message_block,
|  | size_t | bytes_to_write,
|  | u_long | offset,
|  | u_long | offset_high,
|  | const void * | act,
|  | int | priority,
|  | int | signal_number = `0`
| ) | `[virtual]`

Same as above but with gather support, through chaining of composite message blocks using the continuation field.

Note:
  Each data block payload must be at least the size of a system memory page and must be aligned on a system memory page size boundary

Implements ACE_Asynch_Write_File_Impl.

The documentation for this class was generated from the following files:

- WIN32_Asynch_IO.h
- WIN32_Asynch_IO.cpp