cgi_register_parse_cb.3

在 linux平台上的网页编程的模板

.TH cgi_register_parse_cb 3 "12 July 2007" "ClearSilver" "cgi/cgi.h"

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.SH NAME
cgi_register_parse_cb  - Register a parse callback
.SH SYNOPSIS
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#include <cgi/cgi.h>
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NEOERR *cgi_register_parse_cb(CGI *cgi, const char *method, const char *ctype,
                              void *rock, CGI_PARSE_CB parse_cb);

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.SH ARGUMENTS
cgi - a CGI struct
.br
method - the HTTP method you want to handle, or * for all
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ctype - the HTTP Content-Type you want to handle, or * for all
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rock - opaque data that we'll pass to your call back

.SH DESCRIPTION
The ClearSilver CGI Kit has built-in functionality to handle 
the following methods:
GET -> doesn't have any data except query string, which
is processed for all methods
POST w/ application/x-www-form-urlencoded
POST w/ multipart/form-data
processed as RFC2388 data into files and HDF (see
cgi_filehandle())
PUT (any type)
The entire data chunk is stored as a file, with meta
data in HDF (similar to single files in RFC2388). 
The data is accessible via cgi_filehandle with NULL
for name.
To handle other methods/content types, you have to
register your own parse function.  This isn't necessary
if you aren't expecting any data, and technically HTTP
only allows data on PUT/POST requests (and presumably
user defined methods).  In particular, if you want to
implement XML-RPC or SOAP, you'll have to register a
callback here to grab the XML data chunk.  Usually
you'll want to register POST w/ application/xml or POST
w/ text/xml (you either need to register both or
register POST w/ * and check the ctype yourself,
remember to nerr_raise(CGIParseNotHandled) if you aren't
handling the POST).
In general, your callback should:
Find out how much data is available:
l = hdf_get_value (cgi->hdf, "CGI.ContentLength", NULL); 
len = atoi(l);
And read/handle all of the data using cgiwrap_read.
See the builtin handlers for how this is done.  Note
that cgiwrap_read is not guarunteed to return all of
the data you request (just like fread(3)) since it
might be reading of a socket.  Sorry.
You should be careful when reading the data to watch
for short reads (ie, end of file) and cases where the
client sends you data ad infinitum.

.SH "RETURN VALUE"
None

.SH "SEE ALSO"
.BR cgi_debug_init "(3), "cgi_parse "(3), "cgi_destroy "(3), "cgi_js_escape "(3), "cgi_html_escape_strfunc "(3), "cgi_register_strfuncs "(3), "cgi_output "(3), "parse_rfc2388 "(3), "cgi_url_validate "(3), "open_upload "(3), "cgi_cs_init "(3), "cgi_url_escape_more "(3), "cgi_html_strip_strfunc "(3), "cgi_neo_error "(3), "cgi_redirect "(3), "cgi_filehandle "(3), "cgi_register_parse_cb "(3), "cgi_url_escape "(3), "cgi_init "(3), "cgi_redirect_uri "(3), "cgi_cookie_clear "(3), "cgi_url_unescape "(3), "cgi_vredirect "(3), "cgi_display "(3), "cgi_html_ws_strip "(3), "cgi_error "(3), "cgi_cookie_set "(3), "cgi_text_html_strfunc "(3), "cgi_cookie_authority