虚幻4 字符串char utf8转换

\Engine\Source\Runtime\Core\Public\Containers\StringConv.h

// Usage of these should be replaced with StringCasts.#define TCHAR_TO_ANSI(str) (ANSICHAR*)StringCast<ANSICHAR>(static_cast<const TCHAR*>(str)).Get()#define ANSI_TO_TCHAR(str) (TCHAR*)StringCast<TCHAR>(static_cast<const ANSICHAR*>(str)).Get()#define TCHAR_TO_UTF8(str) (ANSICHAR*)FTCHARToUTF8((const TCHAR*)str).Get()#define UTF8_TO_TCHAR(str) (TCHAR*)FUTF8ToTCHAR((const ANSICHAR*)str).Get()