My current task is evaluation crypto (here: OpenPGP) solutions for Microsoft Windows; of course including GnuPG.
Well, what do I say. While there is a nice installer for GnuPG on Windows available (either here or here), try to find one for the gpgme supporting library… (including header and .lib import files for Visual Studio, that is).
You can guess… It’s all about build-your-own-stuff. It basically boils down to this:
- Create a directory to collect all the stuff you will need (e.g.
- Get mingw and install it
- Get MSYS and install it
- Download libgpg-error and extract it
- Download gpgme and extract it
- In the MSYS bash, change to the directory you extracted libgpg-error into and run
./configure --prefix=/mingw && make install
strip src/.libs/libgpg-error-0.dll src/gpg-error.exeas MSVC can’t use gcc’s debug info anyway
src/gpg-error.exe and src/.libs/libgpg-error-0.dllto the bin directory created above
lib/libgpg-error-0.def(note the renaming; otherwise your program will look for a
- Open the Visual Studio Command Prompt
lib /machine:i386 /def:lib\libgpg-error-0.def /out:lib\libgpg-error-0.libto create the import library
- In the MSYS bash, run
./configure --prefix=/mingw && make
strip src/gpgme-w32spawn.exe src/.libs/libgpgme-11.dll
binNote: To use the gpgme library, this binary has to live either in the installation dir of gpg (set in windows registry key
HKLM\Software\GNU\GnuPG\Installation Directory) or in
%PROGRAMFILES%\GNU\GnuPG. Otherwise gpgme will not work!
src/.libs/libgpgme-11.dllto bin and
lib/libgpgme-11.def(Once again, note the renaming)
lib /machine:i386 /def:lib\libgpgme-11.def /out:lib\libgpgme-11.libto create the import library
Optional: Creating the documentation
I was not able to create the documentation properly using cygwin so I did this on a Linux host. Install a TeX distribution of your choice as well as texinfo (for Debian Lenny this would mean installing the packages texinfo, texi2html and texlive). Call make pdf in the doc subdir to generate the PDF documentation and manually call
texi2html gpgme.texi for a HTML document.
Now you can add the lib dir to your Visual Studio linker settings and the include dir to your C/C++ common settings. To make gpgme work, be sure you have the gpgme-w32spawn.exe installed properly as noted above.
I hope this helps to guide one or another through the struggle of getting gpgme on windows.
Q: gpgme does not find libgpg-error
A: You did not call
make installafter compiling it
Q: My program is looking for
A: You did not rename the .def file before calling
Q: I did everything you said, but when I run my program,
GPG_ERR_INV_ENGINE. If I check the engine info,
A: First of all, check if you copied
gpgme-w32spawn.exeto the correct directory. If this is the case, actually, I have no idea what went wrong