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43 lines
1.6 KiB
Groff
43 lines
1.6 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_WRITEDATA.md
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.TH CURLOPT_WRITEDATA 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_WRITEDATA \- pointer passed to the write callback
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);
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.fi
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.SH DESCRIPTION
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A data \fIpointer\fP to pass to the write callback. If you use the
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\fICURLOPT_WRITEFUNCTION(3)\fP option, this is the pointer you get in that
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callback\(aqs fourth and last argument. If you do not use a write callback, you
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must make \fIpointer\fP a \(aqFILE \fI\(aq (cast to \(aqvoid \fP\(aq) as libcurl passes this
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to \fIfwrite(3)\fP when writing data.
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The internal \fICURLOPT_WRITEFUNCTION(3)\fP writes the data to the FILE *
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given with this option, or to stdout if this option has not been set.
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If you are using libcurl as a Windows DLL, you \fBMUST\fP use a
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\fICURLOPT_WRITEFUNCTION(3)\fP if you set this option or you might experience
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crashes.
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.SH DEFAULT
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By default, this is a FILE * to stdout.
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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A common technique is to use the write callback to store the incoming data
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into a dynamically growing allocated buffer, and then this
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\fICURLOPT_WRITEDATA(3)\fP is used to point to a struct or the buffer to store
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data in. Like in the getinmemory example:
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https://curl.se/libcurl/c/getinmemory.html
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.SH AVAILABILITY
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Available in all libcurl versions. This option was formerly known as
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CURLOPT_FILE, the name \fICURLOPT_WRITEDATA(3)\fP was added in 7.9.7.
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.SH RETURN VALUE
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This returns CURLE_OK.
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.SH SEE ALSO
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.BR CURLOPT_HEADERDATA (3),
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.BR CURLOPT_READDATA (3),
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.BR CURLOPT_WRITEFUNCTION (3)
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