Trevor, Disclaimer: Might work. This is somewhere I am also stuck at this time with a similar problem.
What you seek is called "marshalling the data".
On Mon, 2005-09-05 at 10:18, Trevor Warren wrote:
> On the server i have a struct defined as:
>
> struct sendbuff {
> int count;
> char toprint[10000];
> };
>
For ease of use let the structure be:
typedef struct sendbuff {
int count;
char *toprint;
} SENDBUFF;
..................
{
SENDBUFF *sbuf = malloc (sizeof(SENDBUF);
sbuf->count = 999;
sbuf->toprint = malloc(strlen("This is Cool Stuff!"));
strcpy (sbuf->toprint, "This is cool Stuff!");
// Now
{
char *databuf;
int bufsize = 0, buflen = 0;
bufsize = sizeof(int) + strlen(sbuf->toprint) + 1;
databuf = malloc (bufsize);
memset (databuf, 0, bufsize);
memcpy(databuf, &(sbuf->count), sizeof(int));
buflen = sizeof(int);
memcpy(databuf + buflen, sbuf->toprint, strlen(sbuf->toprint) +
1);
//buflen += strlen(sbuf->toprint) + 1;
// Now do the sending to the client socket //
send (client_sock, databuf, bufsize, 0);
.......................
}
Done on the server:
> My objective is to pack this buffer across the n/w
> and recv it on the client. count is a simple counter
> which i am usign to keep track of the lost/unordered
> packets is any. My recv system call on the client is
> as follows. mybuff on the client has been declared of
> type struct sendbuff.
>
Declare mybuff as char *.
char *mybuff;
while(1) //Beggining of While
{
while(bytesrcvd<sizeof(mybuff)) {
if ((numbytes=recv(sockfd, (char *)mybuff,
sizeof(mybuff), 0)) == -1) {
perror("recv");
exit(1);
}
bytesrcvd=numbytes+bytesrcvd;
}
Now over here we retrieve the struct members from mybuff.
{
SENDBUFF *recvdstuff;
recvdstuff->count = *((int *)mybuff;
recvdstuff->toprint = mybuff + sizeof(int);
printf("recvdstuff->count is: %d\n", recvdstuff->count);
printf("recvdstuff->toprint is: %s\n", recvdstuff->toprint);
}
This should work, with a little tweaking to suit your needs. You could
change recvdstuff not to be a pointer.
Could somebody point me to handling a case as follows:
typedef struct test_struct {
int s_id;
char *doc_id;
} TEST_STRUCT;
sendbuff in my case is **ts (where ts is TEST_STRUCT **ts).
Thanks in Advance,
Animesh
--
Animesh Bansriyar <[EMAIL PROTECTED]>
Blog: http://blogs.neolinuxsolutions.com
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