Date: Tue, 22 May 2007 15:24:06 -0400
From: Alvaro Herrera <alvherre@commandprompt.com>
To: Jeff Lynn <jmlynn@rogers.com>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: How do you convert PostgreSQL internal binary field to C
 datatypes
Message-ID: <20070522192406.GG11032@alvh.no-ip.org>
References: <465337D6.6080103@rogers.com>
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Jeff Lynn wrote:
> Does someone out there has some example(s) of converting the 
> PostgreSQL's internal (network byte order) representation of  float4, 
> flost8, date, datetime and timestamp into Win32 float, double, CTime or 
> any Win32 date/time construct under Intel x86 h/w architecture?
> 
> Andrew McNamara in previous post suggested that there are answers in the 
> server source codes.  But for a beginner like me, even though I have 
> extensive coding experience in C, C++ and Java, such undertaking for a 
> significant product like PostgreSQL is a bit overwhelming for now.
> 
> I really do want to explore the usage of PostgreSQL further!  So any 
> help will be greatly appreciated. 

The code to handle these datatypes lies mostly here:
http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/

For example, in float.c look for float4send which directs you to
pq_sendfloat4 which you can find in 

http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/libpq/pqformat.c

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.