Dear Canaan,
Thanks for your reply. It's a great clue :)
btw, i have one more question...
In the receiver, do i need to allocate for example
bar->name member manually? or it's done by recv() ?
--- canaan.kao@xxxxxxxxx wrote:
From: Canaan Kao <canaan.kao@xxxxxxxxx>
To: ajhwb@xxxxxxxx
Cc: linux-c-programming@xxxxxxxxxxxxxxx
Subject: Re: Socket programming
Date: Sun, 22 Mar 2009 21:00:14 +0800
Dear Ardhan,
You can add a mySize data member in struct foo.
struct foo
{
unsigned mySize;
char *name;
char *pix;
int id;
};
struct foo *bar = malloc (sizeof(struct foo));
if(NULL!=bar)bar->mySize=sizeof(struct foo);
/* fill the structure, then send */
Finally, your receiver will get the size of foo in the beginning of the stream.
Best regards,
Canaan
On Sun, Mar 22, 2009 at 8:42 PM, Ardhan Madras <ajhwb@xxxxxxxx> wrote:
> Hi All,
>
> I was written small network utility in Linux 2.6, glibc 2.7.
> I have been using send() and recv() system call in SOCK_STREAM
> to send or receive fixed size data. for example, i write my data
> structure like this:
>
> struct foo
> {
> char name[16];
> char pix[1024];
> int id;
> } bar;
>
> If i want to send or receive data i just call
>
> send (socket, &bar, sizeof(struct foo), 0);
>
> or to receive:
> recv (socket, &bar, sizeof(struct foo), 0);
>
> My problem is how to receive dynamic sized data? for
> example this structure:
>
> struct foo
> {
> char *name;
> char *pix;
> int id;
> }
>
> struct foo *bar = malloc (sizeof(struct foo));
> /* fill the structure, then send */
>
> How to receive the data? since there are no way
> to the receiver to know data sizes?
>
> Thanks for your help.
>
>
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