use member function of socket class or common function in Boost::asio?
I am learning Boost::asio socket; I saw some examples, where they use the member function of socket class to read and receive messages, or use the boost::asio common function which passes the socket as the first param.
So I am wondering what the difference is between the two approaches? thanks!
//one kind
tcp::socket sock;
sock.async_write_some(***);
//another kind
boost::asio::async_write(socket,***);
c++ sockets boost boost-asio
edited Nov 21 '18 at 2:16
John Murray
809514
asked Nov 21 '18 at 1:52
Gordon
776
add a comment |
I am learning Boost::asio socket; I saw some examples, where they use the member function of socket class to read and receive messages, or use the boost::asio common function which passes the socket as the first param.
So I am wondering what the difference is between the two approaches? thanks!
//one kind
tcp::socket sock;
sock.async_write_some(***);
//another kind
boost::asio::async_write(socket,***);
c++ sockets boost boost-asio
edited Nov 21 '18 at 2:16
John Murray
809514
asked Nov 21 '18 at 1:52
Gordon
776
add a comment |
I am learning Boost::asio socket; I saw some examples, where they use the member function of socket class to read and receive messages, or use the boost::asio common function which passes the socket as the first param.
So I am wondering what the difference is between the two approaches? thanks!
//one kind
tcp::socket sock;
sock.async_write_some(***);
//another kind
boost::asio::async_write(socket,***);
c++ sockets boost boost-asio
edited Nov 21 '18 at 2:16
John Murray
809514
asked Nov 21 '18 at 1:52
Gordon
776
I am learning Boost::asio socket; I saw some examples, where they use the member function of socket class to read and receive messages, or use the boost::asio common function which passes the socket as the first param.
So I am wondering what the difference is between the two approaches? thanks!
//one kind
tcp::socket sock;
sock.async_write_some(***);
//another kind
boost::asio::async_write(socket,***);
c++ sockets boost boost-asio
c++ sockets boost boost-asio
edited Nov 21 '18 at 2:16
John Murray
809514
asked Nov 21 '18 at 1:52
Gordon
776
edited Nov 21 '18 at 2:16
John Murray
809514
asked Nov 21 '18 at 1:52
Gordon
776
edited Nov 21 '18 at 2:16
John Murray
809514
edited Nov 21 '18 at 2:16
John Murray
809514
edited Nov 21 '18 at 2:16
John Murray
809514
809514
asked Nov 21 '18 at 1:52
Gordon
776
asked Nov 21 '18 at 1:52
Gordon
776
asked Nov 21 '18 at 1:52
Gordon
776
776
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
async_write as static function guarantees that all data in buffer
is written before this function returns.
async_write_some as function member guarantees that at least one byte
is written from buffer before this function ends.
So if you want to use async_write_some you need to provide more code
to handle the situation when not all data from buffer was written.
Suppose you have string with 10 bytes, it is your buffer and you want to ensure
all buffer is send:
// Pseudocode:
string str;
// add 10 bytes to str
SIZE = 10;
int writtenBytes = 0;
socket.async_write_some (buffer(str.c_str(),SIZE), makeCallback());
void callback (
error_code ec,
size_t transferredBytes)
{
// check errors
// [1]
writtenBytes += transferredBytes;
if (writtenBytes == SIZE)
return;
// call async_write_some
socket.async_write_some (buffer(str.c_str()+writtenBytes,SIZE-writtenBytes),makeCallback());
}
in callback [1] you need to check how many bytes were written,
if result is different from SIZE you need to call async_write_some again
to send the remainder of data and so on, your callback may be invoked many times.
The use of async_write is simpler:
string str; // add 10 bytes
async_write (buffer(str.c_str(),SIZE),makeCallback());
void callback() {
// check errors
[1]
}
if no errors occured in [1] you know that all data was sent.
answered Nov 21 '18 at 6:19
rafix07
6,6531614
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence ofasync_write_someandasync_read_some?
– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can userecvfunction which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. Soasync_read_somefollows such behaviour.
– rafix07
Nov 21 '18 at 8:23
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
async_write as static function guarantees that all data in buffer
is written before this function returns.
async_write_some as function member guarantees that at least one byte
is written from buffer before this function ends.
So if you want to use async_write_some you need to provide more code
to handle the situation when not all data from buffer was written.
Suppose you have string with 10 bytes, it is your buffer and you want to ensure
all buffer is send:
// Pseudocode:
string str;
// add 10 bytes to str
SIZE = 10;
int writtenBytes = 0;
socket.async_write_some (buffer(str.c_str(),SIZE), makeCallback());
void callback (
error_code ec,
size_t transferredBytes)
{
// check errors
// [1]
writtenBytes += transferredBytes;
if (writtenBytes == SIZE)
return;
// call async_write_some
socket.async_write_some (buffer(str.c_str()+writtenBytes,SIZE-writtenBytes),makeCallback());
}
in callback [1] you need to check how many bytes were written,
if result is different from SIZE you need to call async_write_some again
to send the remainder of data and so on, your callback may be invoked many times.
The use of async_write is simpler:
string str; // add 10 bytes
async_write (buffer(str.c_str(),SIZE),makeCallback());
void callback() {
// check errors
[1]
}
if no errors occured in [1] you know that all data was sent.
answered Nov 21 '18 at 6:19
rafix07
6,6531614
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence ofasync_write_someandasync_read_some?
– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can userecvfunction which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. Soasync_read_somefollows such behaviour.
– rafix07
Nov 21 '18 at 8:23
add a comment |
async_write as static function guarantees that all data in buffer
is written before this function returns.
async_write_some as function member guarantees that at least one byte
is written from buffer before this function ends.
So if you want to use async_write_some you need to provide more code
to handle the situation when not all data from buffer was written.
Suppose you have string with 10 bytes, it is your buffer and you want to ensure
all buffer is send:
// Pseudocode:
string str;
// add 10 bytes to str
SIZE = 10;
int writtenBytes = 0;
socket.async_write_some (buffer(str.c_str(),SIZE), makeCallback());
void callback (
error_code ec,
size_t transferredBytes)
{
// check errors
// [1]
writtenBytes += transferredBytes;
if (writtenBytes == SIZE)
return;
// call async_write_some
socket.async_write_some (buffer(str.c_str()+writtenBytes,SIZE-writtenBytes),makeCallback());
}
in callback [1] you need to check how many bytes were written,
if result is different from SIZE you need to call async_write_some again
to send the remainder of data and so on, your callback may be invoked many times.
The use of async_write is simpler:
string str; // add 10 bytes
async_write (buffer(str.c_str(),SIZE),makeCallback());
void callback() {
// check errors
[1]
}
if no errors occured in [1] you know that all data was sent.
answered Nov 21 '18 at 6:19
rafix07
6,6531614
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence ofasync_write_someandasync_read_some?
– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can userecvfunction which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. Soasync_read_somefollows such behaviour.
– rafix07
Nov 21 '18 at 8:23
add a comment |
async_write as static function guarantees that all data in buffer
is written before this function returns.
async_write_some as function member guarantees that at least one byte
is written from buffer before this function ends.
So if you want to use async_write_some you need to provide more code
to handle the situation when not all data from buffer was written.
Suppose you have string with 10 bytes, it is your buffer and you want to ensure
all buffer is send:
// Pseudocode:
string str;
// add 10 bytes to str
SIZE = 10;
int writtenBytes = 0;
socket.async_write_some (buffer(str.c_str(),SIZE), makeCallback());
void callback (
error_code ec,
size_t transferredBytes)
{
// check errors
// [1]
writtenBytes += transferredBytes;
if (writtenBytes == SIZE)
return;
// call async_write_some
socket.async_write_some (buffer(str.c_str()+writtenBytes,SIZE-writtenBytes),makeCallback());
}
in callback [1] you need to check how many bytes were written,
if result is different from SIZE you need to call async_write_some again
to send the remainder of data and so on, your callback may be invoked many times.
The use of async_write is simpler:
string str; // add 10 bytes
async_write (buffer(str.c_str(),SIZE),makeCallback());
void callback() {
// check errors
[1]
}
if no errors occured in [1] you know that all data was sent.
answered Nov 21 '18 at 6:19
rafix07
6,6531614
async_write as static function guarantees that all data in buffer
is written before this function returns.
async_write_some as function member guarantees that at least one byte
is written from buffer before this function ends.
So if you want to use async_write_some you need to provide more code
to handle the situation when not all data from buffer was written.
Suppose you have string with 10 bytes, it is your buffer and you want to ensure
all buffer is send:
// Pseudocode:
string str;
// add 10 bytes to str
SIZE = 10;
int writtenBytes = 0;
socket.async_write_some (buffer(str.c_str(),SIZE), makeCallback());
void callback (
error_code ec,
size_t transferredBytes)
{
// check errors
// [1]
writtenBytes += transferredBytes;
if (writtenBytes == SIZE)
return;
// call async_write_some
socket.async_write_some (buffer(str.c_str()+writtenBytes,SIZE-writtenBytes),makeCallback());
}
in callback [1] you need to check how many bytes were written,
if result is different from SIZE you need to call async_write_some again
to send the remainder of data and so on, your callback may be invoked many times.
The use of async_write is simpler:
string str; // add 10 bytes
async_write (buffer(str.c_str(),SIZE),makeCallback());
void callback() {
// check errors
[1]
}
if no errors occured in [1] you know that all data was sent.
answered Nov 21 '18 at 6:19
rafix07
6,6531614
answered Nov 21 '18 at 6:19
rafix07
6,6531614
answered Nov 21 '18 at 6:19
rafix07
6,6531614
answered Nov 21 '18 at 6:19
rafix07
6,6531614
6,6531614
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence ofasync_write_someandasync_read_some?
– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can userecvfunction which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. Soasync_read_somefollows such behaviour.
– rafix07
Nov 21 '18 at 8:23
add a comment |
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence ofasync_write_someandasync_read_some?
– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can userecvfunction which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. Soasync_read_somefollows such behaviour.
– rafix07
Nov 21 '18 at 8:23
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence of
async_write_some and async_read_some?– Gordon
Nov 21 '18 at 8:12
Thanks so much, according to your answer, async_write function seems a good choice, but what is the meaning of existence of
async_write_some and async_read_some?– Gordon
Nov 21 '18 at 8:12
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can use
recv function which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. So async_read_some follows such behaviour.– rafix07
Nov 21 '18 at 8:23
Hmm, nice question. Boost Asio is wrapper for API which implements berkeley sockets, for example under linux you can use
recv function which also doesn't guarantee that all buffer is received, it can return less bytes than was passed as argument to read. So async_read_some follows such behaviour.– rafix07
Nov 21 '18 at 8:23
add a comment |
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