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CURLOPT_WRITEDATA(3) Library Functions Manual CURLOPT_WRITEDATA(3) NAME CURLOPT_WRITEDATA - pointer passed to the write callback SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer); DESCRIPTION A data pointer to pass to the write callback. If you use the CURLOPT_WRITE- FUNCTION(3) option, this is the pointer you get in that callback's fourth and last argument. If you do not use a write callback, you must make pointer a 'FILE ' (cast to 'void ') as libcurl passes this to fwrite(3) when writing data. The internal CURLOPT_WRITEFUNCTION(3) writes the data to the FILE * given with this option, or to stdout if this option has not been set. If you are using libcurl as a Windows DLL, you must also use CURLOPT_WRITE- FUNCTION(3) if you set this option or you might experience crashes. DEFAULT stdout PROTOCOLS This functionality affects all supported protocols EXAMPLE A common technique is to use the write callback to store the incoming data into a dynamically growing allocated buffer, and then this CURLOPT_WRITE- DATA(3) is used to point to a struct or the buffer to store data in. Like in the getinmemory example: https://curl.se/libcurl/c/getinmemory.html HISTORY This option was formerly known as CURLOPT_FILE, the name CURLOPT_WRITE- DATA(3) was added in 7.9.7. AVAILABILITY Added in curl 7.9.7 RETURN VALUE This returns CURLE_OK. SEE ALSO CURLOPT_HEADERDATA(3), CURLOPT_READDATA(3), CURLOPT_WRITEFUNCTION(3) libcurl 2026-06-11 CURLOPT_WRITEDATA(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | HISTORY | AVAILABILITY | RETURN VALUE | SEE ALSO
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