Use gethostname on Windows

[Jake-Shadle]

The Windows implementation was using GetComputerName even though
gethostname is available on Windows, so I updated to the latest winapi
instead of winutil.

Also added CI.

[Jake-Shadle]

This should also fix #3 as it removes the winutil dependency and therefore the loose dependency on winapi in favor of a more strict one.

[fengcen]

Thanks.

I found that these changes will cause performance problems:

Before:

After:

So I think there is no need to change. Thanks anyway.

[Jake-Shadle]

Yah, I didn't run the benchmark, my bad!

I've updated to use GetComputerNameExA instead, so I get

Which is roughly 5 times as expensive as the previous version on my machine, but should be more accurate as the function winutil is calling is capped at 16 characters (including null terminator) while this one can represent the full hostname.

[swsnr]

I‘d like to see this change applied; GetComputerName returns the truncated netbios name which is not necessarily the same as the system received from DHCP for DNS.

I’d use ComputerNamePhysicalDnsHostname though because it probably does less DNS calls, and perhaps also GetComputerNameExW instead of *A because DNS can contain Unicode probably.

At least that’s what Python does in socket.gethostname and I believe Python receive a good deal of real world testing here.

[fengcen]

Sorry guys. I have no time and interest in Rust right now. This project is going to Abandoned status.

[Jake-Shadle]

@fengcen in that case I wouldn't mind taking over ownership of this crate since I work in rust full time now. 🙂

[swsnr]

@Jake-Shadle I did gethostname.rs meanwhile.

[Jake-Shadle]

Cool, guess we can just use that instead, thanks!