Thread: DLL Problems

lmanorders wrote:
> I’m running Windows 7, 64 bit, C++ Builder XE6, and Postgres 9.4.1. I’m using libpq to interface with
> Postgres. I’m using the DLLs that are installed (pre-compiled) with Postgres 9.4.1.
> 
> I’m having problems finding a set of DLLs that work together properly. The dependencies to libpq.dll
> are shown as ssleay32.dll, libeay32.dll, libintl.dll, and msvcr100.dll. If I use the DLLs that came
> with Postgres 9.3, everything seems to work just fine. If I try to use libpq.dll, ssleay32.dll, and
> libeay32.dll, that come with Postgres 9.4, and the latest versions of libintl.dll and msvcr100.dll
> that I can find, I get the message “The application was unable to start correctly (0xC000007b)”.
> 
> The libpq.dll (9.4 version) seems to be having problems with one or more of the other DLLs. Does
> anyone know what versions of these DLLs will work properly together?

I don't know a lot about Windows.

First, why are you trying to use the precompiled libpq.dll you have with other libraries
than the ones that were included?

For one, I know that EDB's PostgreSQL binaries use a different C runtime (msvc*.dll)
for versions 9.3 and 9.4.  Maybe that is your problem.

There is an excellent tool, Dependency Walker (http://dependencywalker.com/),
that can help you debug problems of this kind.

Yours,
Laurenz Albe

Thanks for the response. Using Dependency Walker helped me to realize that I
was attempting to link a 32 bit program to 64 bit DLLs. I downloaded the
binaries for a 32 bit version of Postgres and used the DLLs that come with
it. Everything works perfectly now.
Thanks!  Lynn

-----Original Message-----
From: Albe Laurenz
Sent: Friday, May 29, 2015 2:16 AM
To: 'lmanorders *EXTERN*' ; pgsql-novice@postgresql.org
Subject: RE: [NOVICE] DLL Problems

lmanorders wrote:
> I’m running Windows 7, 64 bit, C++ Builder XE6, and Postgres 9.4.1. I’m
> using libpq to interface with
> Postgres. I’m using the DLLs that are installed (pre-compiled) with
> Postgres 9.4.1.
>
> I’m having problems finding a set of DLLs that work together properly. The
> dependencies to libpq.dll
> are shown as ssleay32.dll, libeay32.dll, libintl.dll, and msvcr100.dll. If
> I use the DLLs that came
> with Postgres 9.3, everything seems to work just fine. If I try to use
> libpq.dll, ssleay32.dll, and
> libeay32.dll, that come with Postgres 9.4, and the latest versions of
> libintl.dll and msvcr100.dll
> that I can find, I get the message “The application was unable to start
> correctly (0xC000007b)”.
>
> The libpq.dll (9.4 version) seems to be having problems with one or more
> of the other DLLs. Does
> anyone know what versions of these DLLs will work properly together?

I don't know a lot about Windows.

First, why are you trying to use the precompiled libpq.dll you have with
other libraries
than the ones that were included?

For one, I know that EDB's PostgreSQL binaries use a different C runtime
(msvc*.dll)
for versions 9.3 and 9.4.  Maybe that is your problem.

There is an excellent tool, Dependency Walker
(http://dependencywalker.com/),
that can help you debug problems of this kind.

Yours,
Laurenz Albe