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.TH "BSON_WRITER_T" "3" "Feb 23, 2019" "1.14.0" "Libbson"
.SH NAME
bson_writer_t \- bson_writer_t
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.sp
Bulk BSON serialization Abstraction
.SH SYNOPSIS
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.INDENT 3.5
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.nf
.ft C
#include <bson/bson.h>

typedef struct _bson_writer_t bson_writer_t;

bson_writer_t *
bson_writer_new (uint8_t **buf,
                 size_t *buflen,
                 size_t offset,
                 bson_realloc_func realloc_func,
                 void *realloc_func_ctx);
void
bson_writer_destroy (bson_writer_t *writer);
.ft P
.fi
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.SH DESCRIPTION
.sp
The \fBbson_writer_t\fP API provides an abstraction for serializing many BSON documents to a single memory region. The memory region may be dynamically allocated and re\-allocated as more memory is demanded. This can be useful when building network packets from a high\-level language. For example, you can serialize a Python Dictionary directly to a single buffer destined for a TCP packet.
.SH EXAMPLE
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.INDENT 3.5
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.nf
.ft C
#include <bson/bson.h>

int
main (int argc, char *argv[])
{
   bson_writer_t *writer;
   uint8_t *buf = NULL;
   size_t buflen = 0;
   bson_t *doc;

   writer = bson_writer_new (&buf, &buflen, 0, bson_realloc_ctx, NULL);

   for (i = 0; i < 1000; i++) {
      bson_writer_begin (writer, &doc);
      BSON_APPEND_INT32 (&doc, "i", i);
      bson_writer_end (writer);
   }

   bson_writer_destroy (writer);

   bson_free (buf);

   return 0;
}
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.fi
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.SH AUTHOR
MongoDB, Inc
.SH COPYRIGHT
2017-present, MongoDB, Inc
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