mirror of
https://github.com/moparisthebest/curl
synced 2024-12-22 16:18:48 -05:00
217 lines
9.8 KiB
Groff
217 lines
9.8 KiB
Groff
.\" You can view this file with:
|
|
.\" nroff -man [file]
|
|
.\" $Id$
|
|
.\"
|
|
.TH curl_formadd 3 "24 June 2002" "libcurl 7.9.8" "libcurl Manual"
|
|
.SH NAME
|
|
curl_formadd - add a section to a multipart/formdata HTTP POST
|
|
.SH SYNOPSIS
|
|
.B #include <curl/curl.h>
|
|
.sp
|
|
.BI "CURLFORMcode curl_formadd(struct curl_httppost ** " firstitem,
|
|
.BI "struct curl_httppost ** " lastitem, " ...);"
|
|
.ad
|
|
.SH DESCRIPTION
|
|
curl_formadd() is used to append sections when building a multipart/formdata
|
|
HTTP POST (sometimes referred to as rfc1867-style posts). Append one section at
|
|
a time until you've added all the sections you want included and then you pass
|
|
the \fIfirstitem\fP pointer as parameter to \fBCURLOPT_HTTPPOST\fP.
|
|
\fIlastitem\fP is set after each call and on repeated invokes it should be
|
|
left as set to allow repeated invokes to find the end of the list faster.
|
|
|
|
After the \fIlastitem\fP pointer follow the real arguments.
|
|
|
|
The pointers \fI*firstitem\fP and \fI*lastitem\fP should both be pointing to
|
|
NULL in the first call to this function. All list-data will be allocated by
|
|
the function itself. You must call \fIcurl_formfree(3)\fP after the form post
|
|
has been done to free the resources.
|
|
|
|
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
|
You can disable this header with \fICURLOPT_HTTPHEADER\fP as usual.
|
|
|
|
First, there are some basics you need to understand about multipart/formdata
|
|
posts. Each part consists of at least a NAME and a CONTENTS part. If the part
|
|
is made for file upload, there are also a stored CONTENT-TYPE and a FILENAME.
|
|
Below, we'll discuss what options you use to set these properties in the
|
|
parts you want to add to your post.
|
|
|
|
The options listed first are for making normal parts. The options from
|
|
\fICURLFORM_FILE\fP through \fICURLFORM_BUFFERLENGTH\fP are for file upload
|
|
parts.
|
|
.SH OPTIONS
|
|
.IP CURLFORM_COPYNAME
|
|
followed by a string which provides the \fIname\fP of this part. libcurl
|
|
copies the string so your application doesn't need to keep it around after
|
|
this function call. If the name isn't NUL-terminated, or if you'd
|
|
like it to contain zero bytes, you must set its length with
|
|
\fBCURLFORM_NAMELENGTH\fP. The copied data will be freed by
|
|
\fIcurl_formfree(3)\fP.
|
|
.IP CURLFORM_PTRNAME
|
|
followed by a string which provides the \fIname\fP of this part. libcurl
|
|
will use the pointer and refer to the data in your application, so you
|
|
must make sure it remains until curl no longer needs it. If the name
|
|
isn't NUL-terminated, or if you'd like it to contain zero
|
|
bytes, you must set its length with \fBCURLFORM_NAMELENGTH\fP.
|
|
.IP CURLFORM_COPYCONTENTS
|
|
followed by a pointer to the contents of this part, the actual data
|
|
to send away. libcurl copies the provided data, so your application doesn't
|
|
need to keep it around after this function call. If the data isn't null
|
|
terminated, or if you'd like it to contain zero bytes, you must
|
|
set the length of the name with \fBCURLFORM_CONTENTSLENGTH\fP. The copied
|
|
data will be freed by \fIcurl_formfree(3)\fP.
|
|
.IP CURLFORM_PTRCONTENTS
|
|
followed by a pointer to the contents of this part, the actual data
|
|
to send away. libcurl will use the pointer and refer to the data in your
|
|
application, so you must make sure it remains until curl no longer needs it.
|
|
If the data isn't NUL-terminated, or if you'd like it to contain zero bytes,
|
|
you must set its length with \fBCURLFORM_CONTENTSLENGTH\fP.
|
|
.IP CURLFORM_CONTENTSLENGTH
|
|
followed by a long giving the length of the contents. Note that for
|
|
\fICURLFORM_STREAM\fP contents, this option is mandatory.
|
|
.IP CURLFORM_FILECONTENT
|
|
followed by a filename, causes that file to be read and its contents used
|
|
as data in this part. This part does \fInot\fP automatically become a file
|
|
upload part simply because its data was read from a file.
|
|
.IP CURLFORM_FILE
|
|
followed by a filename, makes this part a file upload part. It sets the
|
|
\fIfilename\fP field to the basename of the provided filename, it reads the
|
|
contents of the file and passes them as data and sets the content-type if the
|
|
given file match one of the internally known file extensions. For
|
|
\fBCURLFORM_FILE\fP the user may send one or more files in one part by
|
|
providing multiple \fBCURLFORM_FILE\fP arguments each followed by the filename
|
|
(and each \fICURLFORM_FILE\fP is allowed to have a
|
|
\fICURLFORM_CONTENTTYPE\fP).
|
|
.IP CURLFORM_CONTENTTYPE
|
|
is used in combination with \fICURLFORM_FILE\fP. Followed by a pointer to a
|
|
string which provides the content-type for this part, possibly instead of an
|
|
internally chosen one.
|
|
.IP CURLFORM_FILENAME
|
|
is used in combination with \fICURLFORM_FILE\fP. Followed by a pointer to a
|
|
string, it tells libcurl to use the given string as the \fIfilename\fP in the
|
|
file upload part instead of the actual file name.
|
|
.IP CURLFORM_BUFFER
|
|
is used for custom file upload parts without use of \fICURLFORM_FILE\fP. It
|
|
tells libcurl that the file contents are already present in a buffer. The
|
|
parameter is a string which provides the \fIfilename\fP field in the content
|
|
header.
|
|
.IP CURLFORM_BUFFERPTR
|
|
is used in combination with \fICURLFORM_BUFFER\fP. The parameter is a pointer
|
|
to the buffer to be uploaded. This buffer must not be freed until after
|
|
\fIcurl_easy_cleanup(3)\fP is called. You must also use
|
|
\fICURLFORM_BUFFERLENGTH\fP to set the number of bytes in the buffer.
|
|
.IP CURLFORM_BUFFERLENGTH
|
|
is used in combination with \fICURLFORM_BUFFER\fP. The parameter is a
|
|
long which gives the length of the buffer.
|
|
.IP CURLFORM_STREAM
|
|
Tells libcurl to use the \fICURLOPT_READFUNCTION\fP callback to get data. The
|
|
parameter you pass to \fICURLFORM_STREAM\fP is the pointer passed on to the
|
|
read callback's fourth argument. If you want the part to look like a file
|
|
upload one, set the \fICURLFORM_FILENAME\fP parameter as well. (Option added
|
|
in libcurl 7.18.2)
|
|
.IP CURLFORM_ARRAY
|
|
Another possibility to send options to curl_formadd() is the
|
|
\fBCURLFORM_ARRAY\fP option, that passes a struct curl_forms array pointer as
|
|
its value. Each curl_forms structure element has a CURLformoption and a char
|
|
pointer. The final element in the array must be a CURLFORM_END. All available
|
|
options can be used in an array, except the CURLFORM_ARRAY option itself! The
|
|
last argument in such an array must always be \fBCURLFORM_END\fP.
|
|
.IP CURLFORM_CONTENTHEADER
|
|
specifies extra headers for the form POST section. This takes a curl_slist
|
|
prepared in the usual way using \fBcurl_slist_append\fP and appends the list
|
|
of headers to those libcurl automatically generates. The list must exist while
|
|
the POST occurs, if you free it before the post completes you may experience
|
|
problems.
|
|
|
|
When you've passed the HttpPost pointer to \fIcurl_easy_setopt(3)\fP (using
|
|
the \fICURLOPT_HTTPPOST\fP option), you must not free the list until after
|
|
you've called \fIcurl_easy_cleanup(3)\fP for the curl handle.
|
|
|
|
See example below.
|
|
.SH RETURN VALUE
|
|
0 means everything was ok, non-zero means an error occurred corresponding
|
|
to a CURL_FORMADD_* constant defined in
|
|
.I <curl/curl.h>
|
|
.SH EXAMPLE
|
|
.nf
|
|
|
|
struct curl_httppost* post = NULL;
|
|
struct curl_httppost* last = NULL;
|
|
char namebuffer[] = "name buffer";
|
|
long namelength = strlen(namebuffer);
|
|
char buffer[] = "test buffer";
|
|
char htmlbuffer[] = "<HTML>test buffer</HTML>";
|
|
long htmlbufferlength = strlen(htmlbuffer);
|
|
struct curl_forms forms[3];
|
|
char file1[] = "my-face.jpg";
|
|
char file2[] = "your-face.jpg";
|
|
/* add null character into htmlbuffer, to demonstrate that
|
|
transfers of buffers containing null characters actually work
|
|
*/
|
|
htmlbuffer[8] = '\\0';
|
|
|
|
/* Add simple name/content section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "name",
|
|
CURLFORM_COPYCONTENTS, "content", CURLFORM_END);
|
|
|
|
/* Add simple name/content/contenttype section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "htmlcode",
|
|
CURLFORM_COPYCONTENTS, "<HTML></HTML>",
|
|
CURLFORM_CONTENTTYPE, "text/html", CURLFORM_END);
|
|
|
|
/* Add name/ptrcontent section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "name_for_ptrcontent",
|
|
CURLFORM_PTRCONTENTS, buffer, CURLFORM_END);
|
|
|
|
/* Add ptrname/ptrcontent section */
|
|
curl_formadd(&post, &last, CURLFORM_PTRNAME, namebuffer,
|
|
CURLFORM_PTRCONTENTS, buffer, CURLFORM_NAMELENGTH,
|
|
namelength, CURLFORM_END);
|
|
|
|
/* Add name/ptrcontent/contenttype section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "html_code_with_hole",
|
|
CURLFORM_PTRCONTENTS, htmlbuffer,
|
|
CURLFORM_CONTENTSLENGTH, htmlbufferlength,
|
|
CURLFORM_CONTENTTYPE, "text/html", CURLFORM_END);
|
|
|
|
/* Add simple file section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "picture",
|
|
CURLFORM_FILE, "my-face.jpg", CURLFORM_END);
|
|
|
|
/* Add file/contenttype section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "picture",
|
|
CURLFORM_FILE, "my-face.jpg",
|
|
CURLFORM_CONTENTTYPE, "image/jpeg", CURLFORM_END);
|
|
|
|
/* Add two file section */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "pictures",
|
|
CURLFORM_FILE, "my-face.jpg",
|
|
CURLFORM_FILE, "your-face.jpg", CURLFORM_END);
|
|
|
|
/* Add two file section using CURLFORM_ARRAY */
|
|
forms[0].option = CURLFORM_FILE;
|
|
forms[0].value = file1;
|
|
forms[1].option = CURLFORM_FILE;
|
|
forms[1].value = file2;
|
|
forms[2].option = CURLFORM_END;
|
|
|
|
/* Add a buffer to upload */
|
|
curl_formadd(&post, &last,
|
|
CURLFORM_COPYNAME, "name",
|
|
CURLFORM_BUFFER, "data",
|
|
CURLFORM_BUFFERPTR, record,
|
|
CURLFORM_BUFFERLENGTH, record_length,
|
|
CURLFORM_END);
|
|
|
|
/* no option needed for the end marker */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "pictures",
|
|
CURLFORM_ARRAY, forms, CURLFORM_END);
|
|
/* Add the content of a file as a normal post text value */
|
|
curl_formadd(&post, &last, CURLFORM_COPYNAME, "filecontent",
|
|
CURLFORM_FILECONTENT, ".bashrc", CURLFORM_END);
|
|
/* Set the form info */
|
|
curl_easy_setopt(curl, CURLOPT_HTTPPOST, post);
|
|
|
|
.SH "SEE ALSO"
|
|
.BR curl_easy_setopt "(3), "
|
|
.BR curl_formfree "(3)"
|