It's not that easy. First QLGT on Windows is compiled with Visual Studio
and uses Microsoft's runtime libraries. They won't really work together
with the ones from cygwin and gcc.
Second, afaik, libusb will not really work for Windows. You have to use
the drivers supplied by Garmin.
To port these drivers is not really a work from scratch. The first
version of QLandkarte, the one without the GT, has support for all
devices related to the GPSMap60SCx. Thus there is a blue print on how to
do it. It's just nobody cared about it so far.
>> So I searched but didn't find the garmindev plugins for Windows
>> QLandkarteGT precompiled.
>> Are there precompiled plugins for Windows available or is there a guide
>> how to compile them?
>> The only howto I found was this:
> Although I haven't used Windows myself for a long time now, the other day I
> tried to compile the Windows Garmin drivers under XP (using Cygwin for the
> compiler toolchain). After a minor tweak to the source code, I manage to
> make about half the drivers compile and generate the corresponding DLL, but
> lacking any real skills on Windows I failed to make those DLL available to
> QLGT (after copying the DLL and other resulting files under plugins/ below
> the QLGT installation directory, and trying to run "regsrv32" to no avail).
> The other Garmin devices whose DLL didn't compile failed on the same
> objidl.h include with strange (but documented on the Internet) errors, but
> I wasn't successful applying the workarounds to make them compile.
> I don't know if there is anything else to make for at least those Garmin
> devices whose DLL managed to compile work, but I can't get to show any
> "supported" Garmin models in QLGT no matter what.
> If there is any interest in the compile error messages I can try again and
> post them here for someone else to take from there or assist.
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