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* libpq.a and Xcode on Mac OS X
@ 2007-02-28 21:47 Peter K. Stys <pstys@ohri.ca>
0 siblings, 2 replies; 3+ messages in thread
From: Peter K. Stys @ 2007-02-28 21:47 UTC (permalink / raw)
To: pgsql-interfaces
Hi Folks:
In an attempt to optimize retrieving BLOBs from my PostgreSQL DB I
embarked on a mission to write functions in C to directly access the
back-end using the libpq.a library.
I copied libpq.a from my /usr/local/pgsql/lib/libpq.a installation
into my Xcode project, added all necessary includes and the standard
libpq-fe.h header. My test program builds and runs fine, links
against libpq.a no problem, but upon execution of a simple:
conn = PQconnectdb(conninfo);
(taken from the Postgres examples) the debugger stops in asm code
(presumably the library) with the error:
0x90047960 <+0000> li r0,37
0x90047964 <+0004> sc
0x90047968 <+0008> b 0x90047970 <kill+16>
0x9004796c <+0012> blr
...
Cannot access memory at address 0x0.
I'm using Xcode 2.4 on Mac OS X 10.4.8.
Do you have any ideas or does someone have a simple Xcode project
that would show me how to properly use libpq.a directly from a C
program? Is there an OS X-specific site with examples I could browse
through?
Any advice greatly appreciated. I'm stuck very early in my attempts!
thanks,
Peter.
------------------------------------------------------------------------
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Peter K. Stys, MD
Professor of Medicine(Neurology), Senior Scientist
Ottawa Health Research Institute, Div. of Neuroscience
Ottawa Hospital / University of Ottawa
Ontario, CANADA
tel: (613)761-5444
fax: (613)761-5330
http://www.ohri.ca/profiles/stys.asp
------------------------------------------------------------------------
-------
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: libpq.a and Xcode on Mac OS X
@ 2007-03-01 19:21 Tom Lane <tgl@sss.pgh.pa.us>
parent: Peter K. Stys <pstys@ohri.ca>
1 sibling, 0 replies; 3+ messages in thread
From: Tom Lane @ 2007-03-01 19:21 UTC (permalink / raw)
To: Peter K. Stys <pstys@ohri.ca>; +Cc: pgsql-interfaces
"Peter K. Stys" <pstys@ohri.ca> writes:
> ... My test program builds and runs fine, links
> against libpq.a no problem, but upon execution of a simple:
> conn = PQconnectdb(conninfo);
> (taken from the Postgres examples) the debugger stops in asm code
> (presumably the library) with the error:
> Cannot access memory at address 0x0.
What conninfo string are you passing?
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: libpq.a and Xcode on Mac OS X
@ 2007-03-01 21:09 John DeSoi <desoi@pgedit.com>
parent: Peter K. Stys <pstys@ohri.ca>
1 sibling, 0 replies; 3+ messages in thread
From: John DeSoi @ 2007-03-01 21:09 UTC (permalink / raw)
To: Peter K. Stys <pstys@ohri.ca>; +Cc: pgsql-interfaces
On Feb 28, 2007, at 4:47 PM, Peter K. Stys wrote:
> Do you have any ideas or does someone have a simple Xcode project
> that would show me how to properly use libpq.a directly from a C
> program? Is there an OS X-specific site with examples I could
> browse through?
These sites might have some useful code and examples:
http://www.karppinen.fi/baseten/
http://sourceforge.net/projects/pgsqlformac/
John DeSoi, Ph.D.
http://pgedit.com/
Power Tools for PostgreSQL
^ permalink raw reply [nested|flat] 3+ messages in thread
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2007-02-28 21:47 libpq.a and Xcode on Mac OS X Peter K. Stys <pstys@ohri.ca>
2007-03-01 19:21 ` Tom Lane <tgl@sss.pgh.pa.us>
2007-03-01 21:09 ` John DeSoi <desoi@pgedit.com>
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