78 lines
1.6 KiB
Markdown
78 lines
1.6 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: CURLOPT_READDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_HEADERDATA (3)
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- CURLOPT_READFUNCTION (3)
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- CURLOPT_WRITEDATA (3)
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- CURLOPT_WRITEFUNCTION (3)
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---
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# NAME
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CURLOPT_READDATA - pointer passed to the read callback
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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_READDATA, void *pointer);
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~~~
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# DESCRIPTION
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Data *pointer* to pass to the file read function. If you use the
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CURLOPT_READFUNCTION(3) option, this is the pointer you get as input in
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the fourth argument to the callback.
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If you do not specify a read callback but instead rely on the default internal
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read function, this data must be a valid readable FILE * (cast to 'void *').
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If you are using libcurl as a DLL on Windows, you must use the
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CURLOPT_READFUNCTION(3) callback if you set this option, otherwise you
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might experience crashes.
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# DEFAULT
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By default, this is a FILE * to stdin.
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# PROTOCOLS
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This is used for all protocols when sending data.
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# EXAMPLE
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~~~c
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struct MyData {
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void *custom;
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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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struct MyData this;
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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/* pass pointer that gets passed in to the
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CURLOPT_READFUNCTION callback */
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curl_easy_setopt(curl, CURLOPT_READDATA, &this);
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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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This option was once known by the older name CURLOPT_INFILE, the name
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CURLOPT_READDATA(3) was introduced in 7.9.7.
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# RETURN VALUE
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This returns CURLE_OK.
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