passing unsigned char[]

[bubzilla]

hi

got a little prob with data types.
I´m reading data from a socket in to a unsigned char buf[4096]; .
Now, lets say there are 60Bytes written into the array( but it is
always different).
Now i want to give the bytes to a other class like:

pushControlPacket(buf);

but i only want to give the recieved data, not the whole buffer (4096)
icluding the length of the recieved data.

should i cast the recieced data into a std::string and define the
function like this:

pushControlPacket(std::string);

or is there a way to define a function for variable chararrays like
this:

pushControlPacket(unsigned char[]);

it should be "call by value"

thankx

[Gianni Mariani]

bubzilla wrote:

hi

got a little prob with data types.
I´m reading data from a socket in to a unsigned char buf[4096]; .
Now, lets say there are 60Bytes written into the array( but it is
always different).
Now i want to give the bytes to a other class like:

pushControlPacket(buf);

but i only want to give the recieved data, not the whole buffer (4096)
icluding the length of the recieved data.

should i cast the recieced data into a std::string and define the
function like this:

pushControlPacket(std::string);

That is certainly one way. You can also use std::vector<charinstead
of string.

Most of the socket apps I've used I create a special container type but
unless you're pushing a huge amount of data, std::string is fine.

>
or is there a way to define a function for variable chararrays like
this:

pushControlPacket(unsigned char[]);

it should be "call by value"

You can't pass arrays by value, passing an array always is done by
passing a reference or degenerating to the pointer to the first object
in the array.

>
thankx

[Gavin Deane]

Gianni Mariani wrote:

bubzilla wrote:

hi

got a little prob with data types.
I´m reading data from a socket in to a unsigned char buf[4096]; .
Now, lets say there are 60Bytes written into the array( but it is
always different).
Now i want to give the bytes to a other class like:

pushControlPacket(buf);

but i only want to give the recieved data, not the whole buffer (4096)
icluding the length of the recieved data.

should i cast the recieced data into a std::string and define the
function like this:

pushControlPacket(std::string);

That is certainly one way. You can also use std::vector<charinstead
of string.

Most of the socket apps I've used I create a special container type but
unless you're pushing a huge amount of data, std::string is fine.

The OP has a buffer of unsigned char. Unless you are happy with the
consequences of converting unsigned char to char[*], std::string and
std::vector<charare not suitable. Use a std::vector<unsigned char>.
[*] which will either be nothing, if char has the same representation
as unsigned char, or will be implementation defined (i.e. not
necessarily portable, and you need to look it up) if char has the same
representation as signed char.

Gavin Deane