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54ded66618
- always assign the curl_easy_perform() return code (and declare the necessary 'result' variable for it) - always call curl_easy_cleanup() on the created easy handles Closes #21364
84 lines
1.6 KiB
Markdown
84 lines
1.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_PROGRESSDATA
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_PROGRESSFUNCTION (3)
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- CURLOPT_XFERINFOFUNCTION (3)
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Protocol:
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- All
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Added-in: 7.1
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---
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# NAME
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CURLOPT_PROGRESSDATA - pointer passed to the progress 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_PROGRESSDATA, void *pointer);
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~~~
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# DESCRIPTION
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Pass a *pointer* that is untouched by libcurl and passed as the first
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argument in the progress callback set with CURLOPT_PROGRESSFUNCTION(3).
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# DEFAULT
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NULL
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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struct progress {
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char *private;
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size_t size;
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};
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static int progress_callback(void *clientp,
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double dltotal,
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double dlnow,
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double ultotal,
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double ulnow)
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{
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struct progress *memory = clientp;
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printf("private: %p\n", memory->private);
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/* use the values */
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return 0; /* all is good */
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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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CURLcode result;
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struct progress data;
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/* pass struct to callback */
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curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &data);
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curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
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result = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# %AVAILABILITY%
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# RETURN VALUE
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curl_easy_setopt(3) returns a CURLcode indicating success or error.
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CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
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libcurl-errors(3).
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