proj.db and vcpkg

[timoore]

Hi,
This isn't actually a rocky question, but I stole a bunch of the SRS code for vsgCs and thought that I'd ask the experts. I install PROJ using vcpkg. The code works well, but it can't find proj.db unless I set the PROJ_DATA environment variable. Have you run into this problem before? I'm wondering if something is wrong with my vcpkg setup, or perhaps I can pass an option to vcpkg when PROJ is installed.

Thanks,
Tim

[gwaldron]

If you set PROJ_DEBUG=2 it will tell you where PROJ is looking for its db file.
A lot of times it will still actually find it even though rocky spits out the warning message about the envvar not being set.

[timoore]

Without specifying PROJ_DATA, it says that it's tryling to open "proj.db". Oh well, thanks for the debugging pointer!

…

On Sun, Dec 10, 2023 at 4:41 PM Glenn ***@***.***> wrote: If you set PROJ_DEBUG=3 it will tell you where PROJ is looking for its db file. A lot of times it will still actually find it even though rocky spits out the warning message about the envvar not being set. — Reply to this email directly, view it on GitHub <#20 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABAQAMMUQMFQ4P5DPRNQALYIXQ2RAVCNFSM6AAAAABAOOV7HCVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM3TQMJSGQ2DC> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[gwaldron]

On Windows, if I leave PROJ_DATA unset, I get this:

[rocky info] PROJ says: pj_open_lib(proj.ini): call fopen(H:\devel\rocky\build\vcpkg_installed\x64-windows/share/proj/proj.ini) - succeeded
[rocky info] PROJ says: pj_open_lib(proj.db): call fopen(H:\devel\rocky\build\vcpkg_installed\x64-windows/share/proj/proj.db) - succeeded
[rocky warning] Environment variable PROJ_DATA is not set

where H:\devel\rocky\build\vcpkg_installed\x64-windows contains my vcpkg dependencies.

This works because of this code:
https://github.com/OSGeo/PROJ/blob/657c69c6937c8f7601daf995a0f75207ecaa4fc1/src/filemanager.cpp#L1508

Looks like PROJ also have a user-settable "file_finder" that we could use to locate proj.db. Lots of options, thoughts appreciated.

[gwaldron]

@timoore did you get this working?

[timoore]

Nope, I've gotten by with setting PROJ_DATA. I haven't really had time to figure out what might be going wrong in my vcpkg installation.