> I somehow can't get GPGME to work with a custom configuration
> directory for GnuPG. Every time I set a path any key generation fails
> with a GPGME_ERR_GENERAL afterwards.
Let's tackle this.
> const char* dir = "/home/myuser/crypttest";
So far so good.
> // error = gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP, NULL,
> // CONFIG_DIR);
>
> error = gpgme_ctx_set_engine_info(mContext, GPGME_PROTOCOL_OpenPGP,
> NULL, CONFIG_DIR);
Shouldn't CONFIG_DIR be dir? I'm guessing you have CONFIG_DIR defined
somewhere else in your project and it's sending you off-course. If
you've already tried gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
nullptr, dir) though, ignore me. :)
Also, a C++ tip: never use NULL. NULL is defined to be 0. If you need
the numeric value zero, use 0; if you need a pointer to null, use
nullptr. Wikibooks has a good article on this:
https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/nullptr
> Moreover I searched for information about the default (preferred)
> order of GnuPG for ciphers and hashfunctions. But didn't found
> something. There doesn't seem to be any gpg.conf file on my PC.
You don't need a gpg.conf file, but if you want one, check the GnuPG
FAQ. There's a sample gpg.conf file in there that sets default cipher
preferences. The lines you'll want to change/modify are
"personal-*-preferences".
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