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# ACE_Asynch_Transmit_File Class Reference

This class is a factory for starting off asynchronous transmit files on a stream. More...

`#include <Asynch_IO.h>`

Inheritance diagram for ACE_Asynch_Transmit_File:

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Collaboration diagram for ACE_Asynch_Transmit_File:

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List of all members.

## Public Member Functions
| ACE_Asynch_Transmit_File (void)
| A do nothing constructor.
virtual | ~ACE_Asynch_Transmit_File (void)
| Destructor.
int | open (ACE_Handler &handler, ACE_HANDLE handle=ACE_INVALID_HANDLE, const void *completion_key=0, ACE_Proactor *proactor=0)
int | transmit_file (ACE_HANDLE file, Header_And_Trailer *header_and_trailer=0, size_t bytes_to_write=0, unsigned long offset=0, unsigned long offset_high=0, size_t bytes_per_send=0, unsigned long flags=0, const void *act=0, int priority=0, int signal_number=ACE_SIGRTMIN)
virtual ACE_Asynch_Operation_Impl * | implementation (void) const
| Return the underlying implementation class.
## Protected Attributes
ACE_Asynch_Transmit_File_Impl * | implementation_
| The implementation class.

## Detailed Description

This class is a factory for starting off asynchronous transmit files on a stream.

Once {open} is called, multiple asynchronous {transmit_file}s can started using this class. A ACE_Asynch_Transmit_File::Result will be passed back to the {handler} when the asynchronous transmit file completes through the {ACE_Handler::handle_transmit_file} callback. The transmit_file function transmits file data over a connected network connection. The function uses the operating system's cache manager to retrieve the file data. This function provides high-performance file data transfer over network connections. This function would be of great use in a Web Server, Image Server, etc.

## Constructor & Destructor Documentation

ACE_Asynch_Transmit_File::ACE_Asynch_Transmit_File | ( | void |  | ) |

| A do nothing constructor.

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

| Destructor.

## Member Function Documentation

ACE_Asynch_Operation_Impl * ACE_Asynch_Transmit_File::implementation | ( | void |  | ) | const`[virtual]`

| Return the underlying implementation class. Implements ACE_Asynch_Operation.

int ACE_Asynch_Transmit_File::open | ( | ACE_Handler & | handler,
|  | ACE_HANDLE | handle = `ACE_INVALID_HANDLE`,
|  | const void * | completion_key = `0`,
|  | ACE_Proactor * | proactor = `0`
| ) |

| 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_Asynch_Operation.

int ACE_Asynch_Transmit_File::transmit_file | ( | ACE_HANDLE | file,
|  | Header_And_Trailer * | header_and_trailer = `0`,
|  | size_t | bytes_to_write = `0`,
|  | unsigned long | offset = `0`,
|  | unsigned long | offset_high = `0`,
|  | size_t | bytes_per_send = `0`,
|  | unsigned long | flags = `0`,
|  | const void * | act = `0`,
|  | int | priority = `0`,
|  | int | signal_number = `ACE_SIGRTMIN`
| ) |

| This starts off an asynchronous transmit file. The {file} is a handle to an open file. {header_and_trailer} is a pointer to a data structure that contains pointers to data to send before and after the file data is sent. Set this parameter to 0 if you only want to transmit the file data. Upto {bytes_to_write} will be written to the {socket}. If you want to send the entire file, let {bytes_to_write} = 0. {bytes_per_send} is the size of each block of data sent per send operation. Please read the Win32 documentation on what the flags should be. Priority of the operation is specified by {priority}. On POSIX4-Unix, this is supported. Works like {nice} in Unix. Negative values are not allowed. 0 means priority of the operation same as the process priority. 1 means priority of the operation is one less than process. And so forth. On Win32, this is a no-op. {signal_number} is the POSIX4 real-time signal number to be used for the operation. {signal_number} ranges from ACE_SIGRTMIN to ACE_SIGRTMAX. This argument is a no-op on non-POSIX4 systems.

## Member Data Documentation

ACE_Asynch_Transmit_File_Impl* ACE_Asynch_Transmit_File::implementation_`[protected]`

| The implementation class.

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

- Asynch_IO.h
- Asynch_IO.cpp