Sometime on Sep 4, TW cobbled together some glyphs to say:

struct sendbuff { int count; char toprint[10000]; };

[snip]

while(1) //Beggining of While {

while(bytesrcvd<sizeof(mybuff)) {

possible bug here. you're not taking into account word alignment. The actual size of a struct in memory is not the same as the sum of its elements. It may be larger to account for aligning variables on word boundaries.

You need to have serialize and deserialize functions for your struct that convert it into a byte stream and back.

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