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255 lines
12 KiB
Groff
255 lines
12 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.TH curl_formadd 3 "24 June 2002" "libcurl 7.9.8" "libcurl Manual"
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.SH NAME
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curl_formadd - add a section to a multipart/formdata HTTP POST
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.SH SYNOPSIS
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.B #include <curl/curl.h>
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.sp
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.BI "CURLFORMcode curl_formadd(struct curl_httppost ** " firstitem,
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.BI "struct curl_httppost ** " lastitem, " ...);"
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.ad
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.SH DESCRIPTION
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curl_formadd() is used to append sections when building a multipart/formdata
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HTTP POST (sometimes referred to as RFC2388-style posts). Append one section
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at a time until you've added all the sections you want included and then you
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pass the \fIfirstitem\fP pointer as parameter to \fBCURLOPT_HTTPPOST(3)\fP.
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\fIlastitem\fP is set after each \fIcurl_formadd(3)\fP call and on repeated
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invokes it should be left as set to allow repeated invokes to find the end of
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the list faster.
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After the \fIlastitem\fP pointer follow the real arguments.
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The pointers \fIfirstitem\fP and \fIlastitem\fP should both be pointing to
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NULL in the first call to this function. All list-data will be allocated by
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the function itself. You must call \fIcurl_formfree(3)\fP on the
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\fIfirstitem\fP after the form post has been done to free the resources.
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Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
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You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
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First, there are some basics you need to understand about multipart/formdata
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posts. Each part consists of at least a NAME and a CONTENTS part. If the part
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is made for file upload, there are also a stored CONTENT-TYPE and a FILENAME.
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Below, we'll discuss what options you use to set these properties in the
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parts you want to add to your post.
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The options listed first are for making normal parts. The options from
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\fICURLFORM_FILE\fP through \fICURLFORM_BUFFERLENGTH\fP are for file upload
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parts.
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.SH OPTIONS
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.IP CURLFORM_COPYNAME
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followed by a string which provides the \fIname\fP of this part. libcurl
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copies the string so your application doesn't need to keep it around after
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this function call. If the name isn't NUL-terminated, or if you'd
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like it to contain zero bytes, you must set its length with
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\fBCURLFORM_NAMELENGTH\fP. The copied data will be freed by
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\fIcurl_formfree(3)\fP.
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.IP CURLFORM_PTRNAME
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followed by a string which provides the \fIname\fP of this part. libcurl
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will use the pointer and refer to the data in your application, so you
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must make sure it remains until curl no longer needs it. If the name
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isn't NUL-terminated, or if you'd like it to contain zero
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bytes, you must set its length with \fBCURLFORM_NAMELENGTH\fP.
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.IP CURLFORM_COPYCONTENTS
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followed by a pointer to the contents of this part, the actual data
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to send away. libcurl copies the provided data, so your application doesn't
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need to keep it around after this function call. If the data isn't null
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terminated, or if you'd like it to contain zero bytes, you must
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set the length of the name with \fBCURLFORM_CONTENTSLENGTH\fP. The copied
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data will be freed by \fIcurl_formfree(3)\fP.
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.IP CURLFORM_PTRCONTENTS
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followed by a pointer to the contents of this part, the actual data
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to send away. libcurl will use the pointer and refer to the data in your
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application, so you must make sure it remains until curl no longer needs it.
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If the data isn't NUL-terminated, or if you'd like it to contain zero bytes,
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you must set its length with \fBCURLFORM_CONTENTSLENGTH\fP.
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.IP CURLFORM_CONTENTLEN
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followed by a curl_off_t value giving the length of the contents. Note that
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for \fICURLFORM_STREAM\fP contents, this option is mandatory.
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If you pass a 0 (zero) for this option, libcurl will instead do a strlen() on
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the contents to figure out the size. If you really want to send a zero byte
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content then you must make sure strlen() on the data pointer returns zero.
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(Option added in 7.46.0)
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.IP CURLFORM_CONTENTSLENGTH
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(This option is deprecated. Use \fICURLFORM_CONTENTLEN\fP instead!)
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followed by a long giving the length of the contents. Note that for
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\fICURLFORM_STREAM\fP contents, this option is mandatory.
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If you pass a 0 (zero) for this option, libcurl will instead do a strlen() on
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the contents to figure out the size. If you really want to send a zero byte
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content then you must make sure strlen() on the data pointer returns zero.
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.IP CURLFORM_FILECONTENT
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followed by a filename, causes that file to be read and its contents used
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as data in this part. This part does \fInot\fP automatically become a file
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upload part simply because its data was read from a file.
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.IP CURLFORM_FILE
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followed by a filename, makes this part a file upload part. It sets the
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\fIfilename\fP field to the basename of the provided filename, it reads the
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contents of the file and passes them as data and sets the content-type if the
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given file match one of the internally known file extensions. For
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\fBCURLFORM_FILE\fP the user may send one or more files in one part by
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providing multiple \fBCURLFORM_FILE\fP arguments each followed by the filename
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(and each \fICURLFORM_FILE\fP is allowed to have a
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\fICURLFORM_CONTENTTYPE\fP).
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The given upload file has to exist in its full in the file system already when
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the upload starts, as libcurl needs to read the correct file size beforehand.
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.IP CURLFORM_CONTENTTYPE
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is used in combination with \fICURLFORM_FILE\fP. Followed by a pointer to a
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string which provides the content-type for this part, possibly instead of an
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internally chosen one.
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.IP CURLFORM_FILENAME
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is used in combination with \fICURLFORM_FILE\fP. Followed by a pointer to a
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string, it tells libcurl to use the given string as the \fIfilename\fP in the
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file upload part instead of the actual file name.
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.IP CURLFORM_BUFFER
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is used for custom file upload parts without use of \fICURLFORM_FILE\fP. It
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tells libcurl that the file contents are already present in a buffer. The
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parameter is a string which provides the \fIfilename\fP field in the content
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header.
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.IP CURLFORM_BUFFERPTR
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is used in combination with \fICURLFORM_BUFFER\fP. The parameter is a pointer
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to the buffer to be uploaded. This buffer must not be freed until after
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\fIcurl_easy_cleanup(3)\fP is called. You must also use
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\fICURLFORM_BUFFERLENGTH\fP to set the number of bytes in the buffer.
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.IP CURLFORM_BUFFERLENGTH
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is used in combination with \fICURLFORM_BUFFER\fP. The parameter is a
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long which gives the length of the buffer.
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.IP CURLFORM_STREAM
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Tells libcurl to use the \fICURLOPT_READFUNCTION(3)\fP callback to get
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data. The parameter you pass to \fICURLFORM_STREAM\fP is the pointer passed on
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to the read callback's fourth argument. If you want the part to look like a
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file upload one, set the \fICURLFORM_FILENAME\fP parameter as well. Note that
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when using \fICURLFORM_STREAM\fP, \fICURLFORM_CONTENTSLENGTH\fP must also be
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set with the total expected length of the part. (Option added in libcurl
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7.18.2)
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.IP CURLFORM_ARRAY
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Another possibility to send options to curl_formadd() is the
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\fBCURLFORM_ARRAY\fP option, that passes a struct curl_forms array pointer as
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its value. Each curl_forms structure element has a CURLformoption and a char
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pointer. The final element in the array must be a CURLFORM_END. All available
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options can be used in an array, except the CURLFORM_ARRAY option itself! The
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last argument in such an array must always be \fBCURLFORM_END\fP.
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.IP CURLFORM_CONTENTHEADER
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specifies extra headers for the form POST section. This takes a curl_slist
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prepared in the usual way using \fBcurl_slist_append\fP and appends the list
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of headers to those libcurl automatically generates. The list must exist while
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the POST occurs, if you free it before the post completes you may experience
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problems.
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When you've passed the HttpPost pointer to \fIcurl_easy_setopt(3)\fP (using
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the \fICURLOPT_HTTPPOST(3)\fP option), you must not free the list until after
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you've called \fIcurl_easy_cleanup(3)\fP for the curl handle.
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See example below.
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.SH RETURN VALUE
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0 means everything was ok, non-zero means an error occurred corresponding
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to a CURL_FORMADD_* constant defined in
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.I <curl/curl.h>
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.SH EXAMPLE
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.nf
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struct curl_httppost* post = NULL;
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struct curl_httppost* last = NULL;
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char namebuffer[] = "name buffer";
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long namelength = strlen(namebuffer);
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char buffer[] = "test buffer";
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char htmlbuffer[] = "<HTML>test buffer</HTML>";
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long htmlbufferlength = strlen(htmlbuffer);
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struct curl_forms forms[3];
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char file1[] = "my-face.jpg";
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char file2[] = "your-face.jpg";
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/* add null character into htmlbuffer, to demonstrate that
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transfers of buffers containing null characters actually work
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*/
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htmlbuffer[8] = '\\0';
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/* Add simple name/content section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "name",
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CURLFORM_COPYCONTENTS, "content", CURLFORM_END);
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/* Add simple name/content/contenttype section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "htmlcode",
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CURLFORM_COPYCONTENTS, "<HTML></HTML>",
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CURLFORM_CONTENTTYPE, "text/html", CURLFORM_END);
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/* Add name/ptrcontent section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "name_for_ptrcontent",
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CURLFORM_PTRCONTENTS, buffer, CURLFORM_END);
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/* Add ptrname/ptrcontent section */
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curl_formadd(&post, &last, CURLFORM_PTRNAME, namebuffer,
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CURLFORM_PTRCONTENTS, buffer, CURLFORM_NAMELENGTH,
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namelength, CURLFORM_END);
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/* Add name/ptrcontent/contenttype section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "html_code_with_hole",
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CURLFORM_PTRCONTENTS, htmlbuffer,
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CURLFORM_CONTENTSLENGTH, htmlbufferlength,
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CURLFORM_CONTENTTYPE, "text/html", CURLFORM_END);
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/* Add simple file section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "picture",
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CURLFORM_FILE, "my-face.jpg", CURLFORM_END);
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/* Add file/contenttype section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "picture",
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CURLFORM_FILE, "my-face.jpg",
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CURLFORM_CONTENTTYPE, "image/jpeg", CURLFORM_END);
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/* Add two file section */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "pictures",
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CURLFORM_FILE, "my-face.jpg",
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CURLFORM_FILE, "your-face.jpg", CURLFORM_END);
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/* Add two file section using CURLFORM_ARRAY */
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forms[0].option = CURLFORM_FILE;
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forms[0].value = file1;
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forms[1].option = CURLFORM_FILE;
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forms[1].value = file2;
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forms[2].option = CURLFORM_END;
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/* Add a buffer to upload */
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curl_formadd(&post, &last,
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CURLFORM_COPYNAME, "name",
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CURLFORM_BUFFER, "data",
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CURLFORM_BUFFERPTR, record,
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CURLFORM_BUFFERLENGTH, record_length,
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CURLFORM_END);
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/* no option needed for the end marker */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "pictures",
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CURLFORM_ARRAY, forms, CURLFORM_END);
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/* Add the content of a file as a normal post text value */
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curl_formadd(&post, &last, CURLFORM_COPYNAME, "filecontent",
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CURLFORM_FILECONTENT, ".bashrc", CURLFORM_END);
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/* Set the form info */
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curl_easy_setopt(curl, CURLOPT_HTTPPOST, post);
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.SH "SEE ALSO"
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.BR curl_easy_setopt "(3), "
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.BR curl_formfree "(3)"
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