73 lines
1.7 KiB
Markdown
73 lines
1.7 KiB
Markdown
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---
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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: curl_formget
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Section: 3
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Source: libcurl
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See-also:
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- curl_formadd (3)
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- curl_mime_init (3)
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---
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# NAME
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curl_formget - serialize a previously built multipart form POST chain
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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int curl_formget(struct curl_httppost * form, void *userp,
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curl_formget_callback append);
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~~~
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# DESCRIPTION
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curl_formget() serializes data previously built with curl_formadd(3). It
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accepts a void pointer as second argument named *userp* which is passed as
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the first argument to the curl_formget_callback function.
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~~~c
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typedef size_t (*curl_formget_callback)(void *userp, const char *buf,
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size_t len);"
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~~~
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The curl_formget_callback is invoked for each part of the HTTP POST chain. The
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character buffer passed to the callback must not be freed. The callback should
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return the buffer length passed to it on success.
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If the **CURLFORM_STREAM** option is used in the formpost, it prevents
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curl_formget(3) from working until you have performed the actual HTTP
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request. This, because first then does libcurl known which actual read
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callback to use!
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# EXAMPLE
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~~~c
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size_t print_httppost_callback(void *arg, const char *buf, size_t len)
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{
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fwrite(buf, len, 1, stdout);
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(*(size_t *) arg) += len;
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return len;
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}
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size_t print_httppost(struct curl_httppost *post)
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{
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size_t total_size = 0;
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if(curl_formget(post, &total_size, print_httppost_callback)) {
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return (size_t) -1;
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}
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return total_size;
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}
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~~~
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# AVAILABILITY
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This function was added in libcurl 7.15.5. The form API is deprecated in
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libcurl 7.56.0.
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# RETURN VALUE
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0 means everything was OK, non-zero means an error occurred
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