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Full Discussion: Help with sockets in C
Top Forums Programming Help with sockets in C Post 302510111 by Corona688 on Friday 1st of April 2011 02:33:46 PM
Old 04-01-2011
Quote:
Originally Posted by omega666
i dont understand, the only times i use that str_len is when the strings have no \n inside...
That's on the server end. receive_message has no way to tell the client how long it is, so the client receives something and uses str_len, which stops at newlines.
Quote:
when the problem happens, it stops reading at the first newline that it finds, how do you make it read past it until it finds a \0 ?
It's because your str_len function stops at newlines. Just use ordinary strlen(), which doesn't.

And you have to separate your records somehow. You simply cannot depend on receiving things in the same size chunks you sent them. It can work the other way too -- you could do two small sends, and do one big receive.
 

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xcb_glx_query_server_string(3)					   XCB Requests 				    xcb_glx_query_server_string(3)

NAME
xcb_glx_query_server_string - SYNOPSIS
#include <xcb/glx.h> Request function xcb_glx_query_server_string_cookie_t xcb_glx_query_server_string(xcb_connection_t *conn, uint32_t screen, uint32_t name); Reply datastructure typedef struct xcb_glx_query_server_string_reply_t { uint8_t response_type; uint8_t pad0; uint16_t sequence; uint32_t length; uint8_t pad1[4]; uint32_t str_len; uint8_t pad2[16]; } xcb_glx_query_server_string_reply_t; Reply function xcb_glx_query_server_string_reply_t *xcb_glx_query_server_string_reply(xcb_connection_t *conn, xcb_glx_query_server_string_cookie_t cookie, xcb_generic_error_t **e); Reply accessors char *xcb_glx_query_server_string_string(const xcb_glx_query_server_string_request_t *reply); int xcb_glx_query_server_string_string_length(const xcb_glx_query_server_string_reply_t *reply); xcb_generic_iterator_t xcb_glx_query_server_string_string_end(const xcb_glx_query_server_string_reply_t *reply); REQUEST ARGUMENTS
conn The XCB connection to X11. screen TODO: NOT YET DOCUMENTED. name TODO: NOT YET DOCUMENTED. REPLY FIELDS
response_type The type of this reply, in this case XCB_GLX_QUERY_SERVER_STRING. This field is also present in the xcb_generic_reply_t and can be used to tell replies apart from each other. sequence The sequence number of the last request processed by the X11 server. length The length of the reply, in words (a word is 4 bytes). str_len TODO: NOT YET DOCUMENTED. DESCRIPTION
RETURN VALUE
Returns an xcb_glx_query_server_string_cookie_t. Errors have to be handled when calling the reply function xcb_glx_query_server_string_re- ply. If you want to handle errors in the event loop instead, use xcb_glx_query_server_string_unchecked. See xcb-requests(3) for details. ERRORS
This request does never generate any errors. SEE ALSO
AUTHOR
Generated from glx.xml. Contact xcb@lists.freedesktop.org for corrections and improvements. XCB
2014-06-10 xcb_glx_query_server_string(3)
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