io_win32 does not handle non-ascii chars in paths. #3951
Description
protoc.exe --cpp_out=. ./helloworld.proto
If the path is in Chinese, this problem will arise.
The GetCurrentDirectoryA function returns the GB18030 encoding
Using MultiByteToWideChar (CP_UTF8, 0, s.c_str (), s.size (), result.get (), len + 1) error ，CP_ACP should be used。
file ：src\google\protobuf\stubs\io_win32.cc