Windows下提供了两个编码转换函数：WideCharToMultiByte和MultiByteToWideChar。
用它们可实现Unicode(UCS2)，UTF8，GBK(GB2312)互转。这两个函数的原型是：
int
WINAPI
MultiByteToWideChar(
__in UINT CodePage,
__in DWORD dwFlags,
__in_bcount(cbMultiByte) LPCSTR lpMultiByteStr,
__in int cbMultiByte,
__out_ecount_opt(cchWideChar) __transfer(lpMultiByteStr) LPWSTR lpWideCharStr,
__in int cchWideChar);
int
WINAPI
WideCharToMultiByte(
__in UINT CodePage,
__in DWORD dwFlags,
__in_ecount(cchWideChar) LPCWSTR lpWideCharStr,
__in int cchWideChar,
__out_bcount_opt(cbMultiByte) __transfer(lpWideCharStr) LPSTR lpMultiByteStr,
__in int cbMultiByte,
__in_opt LPCSTR lpDefaultChar,
__out_opt LPBOOL lpUsedDefaultChar);
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