Volume 7A: XView Programming Manual

Example A-3. The long_seln.c program (continued)

{

char *text = get_selection();

if (text)

printf("–––seln–––\n%.*s [...]\n–––end seln–––\n", 20, text);

}

/*

* return the text selected in the current selection rank. Use

* selection_query() to guarantee that the entire selection is

* retrieved. selection_query() calls our installed routine,

* read_proc() (see below).

*/

char *

get_selection()

{

Seln_holder holder;

Seln_result result;

Seln_request *response;

char context = FIRST_BUFFER;

holder = selection_inquire(server, seln_type);

printf("selection type = %s\n",

seln_type == SELN_PRIMARY? "primary" :

seln_type == SELN_SECONDARY? "secondary" : "shelf");

/* result is based on the return value of read_proc() */

result = selection_query(server, &holder, read_proc, &context,

SELN_REQ_BYTESIZE, NULL,

SELN_REQ_CONTENTS_ASCII, NULL,

NULL);

if (result == SELN_FAILED) {

puts("couldn’t get selection");

return NULL;

}

return seln_bufs[seln_type ];

}

/*

* Called by selection_query for every buffer of information received.

* Short messages (under about 2000 bytes) will fit into one buffer.

* For larger messages, read_proc is called for each buffer in the

* selection. The context pointer passed to selection_query is

* modified by read_proc so that we know if this is the first buffer

* or not.

*/

Seln_result

read_proc(response)

Seln_request *response;

{

char *reply; /* pointer to the data in the response received */

long seln_len; /* to