213 lines
8.7 KiB
Groff
213 lines
8.7 KiB
Groff
.\" You can view this file with:
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.\" nroff -man [file]
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.\" $Id$
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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 HttpPost ** " firstitem,
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.BI "struct 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 refered to as rfc1867-style posts). Append one section at
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a time until you've added all the sections you want included and then you pass
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the \fIfirstitem\fP pointer as parameter to \fBCURLOPT_HTTPPOST\fP.
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\fIlastitem\fP is set after each call and on repeated invokes it should be
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left as set to allow repeated invokes to find the end of the list faster.
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After the \fIlastitem\fP pointer follow the real arguments.
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The pointers \fI*firstitem\fP and \fI*lastitem\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\fP after the form post has
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been done to free the resources again.
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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
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FILENAME. Below here, we'll discuss on what options you use to set these
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properties in the parts you want to add to your post.
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.SH OPTIONS
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.B CURLFORM_COPYNAME
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followed by string is used to set the name of this part. libcurl copies the
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given data, so your application doesn't need to keep it around after this
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function call. If the name isn't zero terminated properly, or if you'd like it
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to contain zero bytes, you need to set the length of the name with
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\fBCURLFORM_NAMELENGTH\fP.
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.B CURLFORM_PTRNAME
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followed by a string is used for the name of this part. libcurl will use the
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pointer and refer to the data in your application, you must make sure it
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remains until curl no longer needs it. If the name isn't zero terminated
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properly, or if you'd like it to contain zero bytes, you need to set the
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length of the name with \fBCURLFORM_NAMELENGTH\fP.
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.B CURLFORM_COPYCONTENTS
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followed by a string is used for the contents of this part, the actual data to
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send away. libcurl copies the given data, so your application doesn't need to
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keep it around after this function call. If the data isn't zero terminated
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properly, or if you'd like it to contain zero bytes, you need to set the
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length of the name with \fBCURLFORM_CONTENTSLENGTH\fP.
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.B CURLFORM_PTRCONTENTS
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followed by a string is used for the contents of this part, the actual data to
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send away. libcurl will use the pointer and refer to the data in your
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application, you must make sure it remains until curl no longer needs it. If
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the data isn't zero terminated properly, or if you'd like it to contain zero
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bytes, you need to set the length of the name with
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\fBCURLFORM_CONTENTSLENGTH\fP.
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.B CURLFORM_FILECONTENT
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followed by a file name, makes that file read and the contents will be used in
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as data in this part.
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.B CURLFORM_FILE
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followed by a file name, makes this part a file upload part. It sets the file
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name field to the actual file name used here, it gets the contents of the file
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and passes as data and sets the content-type if the given file match one of
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the new internally known file extension. For \fBCURLFORM_FILE\fP the user may
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send one or more files in one part by providing multiple \fBCURLFORM_FILE\fP
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arguments each followed by the filename (and each CURLFORM_FILE is allowed to
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have a CURLFORM_CONTENTTYPE).
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.B CURLFORM_CONTENTTYPE
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followed by a pointer to a string with a content-type will make curl use this
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given content-type for this file upload part, possibly instead of an
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internally chosen one.
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.B CURLFORM_FILENAME
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followed by a pointer to a string to a name, will make libcurl use the given
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name in the file upload part, intead of the actual file name given to
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\fICURLFORM_FILE\fP.
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.B BCURLFORM_BUFFER
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followed by a string, tells libcurl that a buffer is to be used to upload data
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instead of using a file. The given string is used as the value of the file
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name field in the content header.
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.B CURLFORM_BUFFERPTR
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followed by a pointer to a data area, tells libcurl the address of the buffer
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containing data to upload (as indicated with \fICURLFORM_BUFFER\fP). The
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buffer containing this data must not be freed until after curl_easy_cleanup is
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called.
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.B CURLFORM_BUFFERLENGTH
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followed by a long with the size of the \fICURLFORM_BUFFERPTR\fP data area,
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tells libcurl the length of the buffer to upload.
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.B 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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.B 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\fP (using the
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\fICURLOPT_HTTPPOST\fP option), you must not free the list until after you've
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called \fIcurl_easy_cleanup\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 as
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.I <curl/curl.h>
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defines.
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.SH EXAMPLE
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.nf
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struct HttpPost* post = NULL;
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struct 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_formparse "(3) [deprecated], "
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.BR curl_formfree "(3)"
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.SH BUGS
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Surely there are some, you tell me!
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