[Rd] Writing character vectors with embedded nulls to a connection
Jeffrey Horner
jeff.horner at vanderbilt.edu
Fri Mar 31 00:34:46 CEST 2006
Is this possible? I've tried both writeChar() and writeBin() to no avail.
My goal is to serialize(ascii=FALSE) an object to a connection but
determine the size of the serialized object before hand:
sobject <- serialize(object,NULL,ascii=FALSE)
len <- nchar(sobject)
#
# run some code here to notify listener on other end of connection
# how many bytes I'm getting ready to send
#
writeChar(sobject,con)
The other option is to serialize twice:
len <- nchar(serialize(object,NULL,ascii=FALSE))
#
# run some code here to notify listener on other end of connection
# how many bytes I'm getting ready to send
#
serialize(object,con,ascii=FALSE)
Object stores, like memcache (http://danga.com/memcached/), need to know
object sizes before storing. RDBMS's which support large objects (CLOBS
or BLOBS) don't nececarilly need to know object sizes before-hand, but
they do have max column size limits which must be honored.
BTW, readchar() can read strings with embedded nulls; I figured
writeChar() should be able to write them.
--
Jeffrey Horner Computer Systems Analyst School of Medicine
615-322-8606 Department of Biostatistics Vanderbilt University
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