98 lines
2.3 KiB
Markdown
98 lines
2.3 KiB
Markdown
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_UPLOAD
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_INFILESIZE_LARGE (3)
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- CURLOPT_PUT (3)
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- CURLOPT_READFUNCTION (3)
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---
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# NAME
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CURLOPT_UPLOAD - data upload
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD, long upload);
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~~~
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# DESCRIPTION
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The long parameter *upload* set to 1 tells the library to prepare for and
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perform an upload. The CURLOPT_READDATA(3) and
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CURLOPT_INFILESIZE(3) or CURLOPT_INFILESIZE_LARGE(3) options are
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also interesting for uploads. If the protocol is HTTP, uploading means using
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the PUT request unless you tell libcurl otherwise.
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Using PUT with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
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You can disable this header with CURLOPT_HTTPHEADER(3) as usual.
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If you use PUT to an HTTP 1.1 server, you can upload data without knowing the
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size before starting the transfer. The library enables this by adding a header
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"Transfer-Encoding: chunked". With HTTP 1.0 or if you prefer not to use chunked
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transfer, you must specify the size of the data with
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CURLOPT_INFILESIZE(3) or CURLOPT_INFILESIZE_LARGE(3).
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# DEFAULT
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0, default is download
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# PROTOCOLS
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Most
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# EXAMPLE
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~~~c
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static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
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{
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FILE *src = userdata;
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/* copy as much data as possible into the 'ptr' buffer, but no more than
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'size' * 'nmemb' bytes */
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size_t retcode = fread(ptr, size, nmemb, src);
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return retcode;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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FILE *src = fopen("local-file", "r");
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curl_off_t fsize; /* set this to the size of the input file */
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/* we want to use our own read function */
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curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_cb);
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/* enable uploading */
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curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
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/* specify target */
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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/to/newfile");
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/* now specify which pointer to pass to our callback */
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curl_easy_setopt(curl, CURLOPT_READDATA, src);
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/* Set the size of the file to upload */
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curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fsize);
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/* Now run off and do what you have been told! */
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curl_easy_perform(curl);
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}
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}
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~~~
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# AVAILABILITY
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Always
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# RETURN VALUE
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Returns CURLE_OK
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