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Author Topic: Can not load PostgreSQL library "libpql.dll" [SOLVED]  (Read 523 times)

stoffman

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Can not load PostgreSQL library "libpql.dll" [SOLVED]
« on: November 20, 2020, 01:20:07 pm »
Hi,

I build the simplest application that tries to connect to Postgres. And it cannot load the libql.dll

I placed the dll file in the same directory of the exe file, I made sure it is of the same version (win64) I set the path correctly.

Is is some sort of bug? It driving me nuts.

Ideas?

(Lazarus 2.0.10 Windows 64bit)

Thanks,
« Last Edit: November 21, 2020, 03:02:00 pm by stoffman »
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Zvoni

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #1 on: November 20, 2020, 01:54:37 pm »
IIRC, if running in IDE the dll has to be beside the Lazarus-exe......
at least it was that way with sqlite....
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stoffman

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #2 on: November 20, 2020, 02:50:46 pm »
Sadly that is not the case. It also happens when I'm running the exe file itself (and the dll is placed in the directory of the exe)
« Last Edit: November 20, 2020, 03:01:17 pm by stoffman »
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eny

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #3 on: November 20, 2020, 03:53:39 pm »
Is that the right dll name?
When I look in one of the PQ sources I see

Code: Pascal  [Select][+][-]
  1. {$IFDEF Windows}
  2.   const
  3.     pqlib = 'libpq.dll'; // Not sure if it has a version number ?
  4. {$ENDIF}
  5.  
 
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stoffman

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #4 on: November 20, 2020, 04:08:41 pm »
Yes this is the correct name.

See the attached file.

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Mimmo

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #5 on: November 20, 2020, 05:13:52 pm »
Please check to have ssleay32.dll, libeay32.dll and libintl-9.dll in the same folder of lipq.dll.
You can also try to run a dependencies inspector like DepencyWalker against libpql.dll to check if all the necessary dll files are installed in your system.
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stoffman

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #6 on: November 21, 2020, 06:57:31 am »
 %) So many of the dependencies are missing. Is there a utility that auto download  all the missing dll files? (The rabbit hole is deep on this one. I'm also missing some VC related DLL and what not)
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stoffman

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Re: Can not load PostgreSQL library "libpql.dll"
« Reply #7 on: November 21, 2020, 03:01:29 pm »
For future generations:

I copied "libpq.dll" from postgres bin directory:

https://get.enterprisedb.com/postgresql/postgresql-13.1-1-windows-x64-binaries.zip

I also add to copy from this repository both "libiconv-2.dll" and "libintl-8.dll" (you can find it pgAdmin4 directory)

Finally I had to install openssl for windows:
http://slproweb.com/download/Win64OpenSSL_Light-1_1_1h.exe
 
Thanks everyone for the help!




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