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.so man.macros
.TH Ns_ConnGetQuery 3 4.5 AOLserver "AOLserver Library Procedures"
.BS
'\" Note: do not modify the .SH NAME line immediately below!
.SH NAME
Ns_ConnGetQuery, Ns_ConnClearQuery, Ns_ConnGetFile, Ns_ConnFirstFile, Ns_ConnNextFile \- Routines to access query data included with a connection request
.SH SYNOPSIS
.nf
\fB#include "ns.h"\fR
.sp
Ns_Set *
\fBNs_ConnGetQuery\fR(\fINs_Conn *conn\fR)
.sp
void
\fBNs_ConnClearQuery\fR(\fINs_Conn *conn\fR)
.sp
Ns_ConnFile *
\fBNs_ConnGetFile\fR(\fINs_Conn *conn, char *file\fR)
.sp
Ns_ConnFile *
\fBNs_ConnFirstFile\fR(\fINs_Conn *conn, Tcl_HashSearch *searchPtr\fR)
.sp
Ns_ConnFile *
\fBNs_ConnNextFile\fR(\fINs_Conn *conn, Tcl_HashSearch *searchPtr\fR)
.sp
.SH ARGUMENTS
.AS Tcl_HashSearch *searchPtr in/out
.AP Ns_Conn *conn in
Pointer to given connection.
.AP char *file in
Name of embedded file.
.AP Tcl_HashSearch *searchPtr in/out
Pointer to buffer to maintain state of an active search.
.sp
.BE
.SH DESCRIPTION
.PP
These routines provide access to connection query data, derived
from either URL query arguments (i.e., key/value pairs after the
\fI?\fR in an URL) or via an HTTP POST. The server supports ordinary
URL encoded forms as well as \fImultipart/form-data\fR forms which
may include one or more embedded files.
.PP
As form processing is a common and important aspect of dynamic web
applications, AOLserver provides easy access to the query data
within the core. The parsing occurs on demand and the results are
cached for reuse throughout the connection; there is no need to
copy the returned \fINs_Set\fR or \fINs_ConnFile\fR structure(s).
The results of these routines should be considered read-only.
.TP
Ns_Set *\fBNs_ConnGetQuery\fR(\fIconn\fR)
Returns a pointer to an \fINs_Set\fR with the fields of the connection
query or \fINULL\fR if no valid query was present. The keys and
values are in UTF-8, decoded from the request based on the server
\fIurlencoding\fR config option. Subsequent calls to \fBNs_ConnGetQuery\fR
will return the same set unless the server detects the connection
encoding has changed in which case the previous query is cleared
and a new query result is generated.
.sp
Data for the query is based on any URL query arguments which may
be present (i.e., key/value pairs following the \fI?\fR in the URL).
If there is no URL query data, the server will parse the content
of an HTTP \fBPOST\fI.
.TP
void \fBNs_ConnClearQuery\fR(\fIconn\fR)
Frees the previous parsed query, if any. There is normally no need
to call this routine as it is called automatically at the end of a
connection if necessary. It is normally only called internally
when \fBNs_ConnGetQuery\fI detects the url encoding has been manually
updated for the connection, potentially invalidating the character
encoding on the previous form parsing.
.PP
Ns_ConnFile *\fBNs_ConnGetFile\fR(\fIfile\fR)
Returns the \fINs_ConnFile\fR structure for the given file if present
which includes the following fields:
.sp
.CS
typedef struct Ns_ConnFile {
char *name;
Ns_Set *headers;
off_t offset;
off_t length;
} Ns_ConnFile;
.CE
.sp
The \fIname\fR field is a pointer to a string which matches the
name as provided by the corresponding form \fI\fR tag. The
\fIheaders\fR field is a pointer to an \fINs_Set\fR with the key/value
pairs for the file input meta data, e.g., a \fIContent-Type\fR
header. The \fIoffset\fR and \fIlength\fR fields specfy where
within the content the actual file bytes are located. See the
\fBNs_ConnContent\fR man page for details on accessing the content
bytes either through an in-memory buffer or open temp file.
.PP
\fBNs_ConnFirstFile\fR and \fBNs_ConnNextFile\fR routines
allow you to manage a search through the underlying hash table
of uploaded files.
.SH EXAMPLE
Given the following HTML form:
.sp
.CS
.CE
the following code would dump the form strings and file info to the
server log:
.sp
.CS
void
DumpQuery(Ns_Conn *conn)
{
Ns_Set *query;
Ns_ConnFile *filePtr;
Tcl_HashSearch search;
query = Ns_ConnGetQuery(conn);
if (query != NULL) {
/* Dump key/values of all fields. */
Ns_SetPrint(query);
/* Dump info on each embedded file. */
filePtr = Ns_ConnFirstFile(conn);
while (filePtr != NULL) {
Ns_Log(Notice, "file: %s %d %d", filePtr->name,
filePtr->offset, filePtr->length);
filePtr = Ns_ConnNextFile(conn);
}
}
}
.CE
.SH "SEE ALSO"
Ns_Set(3), Ns_Conn(3), Ns_ConnContent(3), ns_conn(n), ns_parsequery(n)
.SH KEYWORDS
form, query