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先
DWORD UniCodeLen = MultiByteToWideChar(CP_ACP, 0, pASCIIBuf , -1, 0, 0);
再
MultiByteToWideChar(CP_ACP, 0, pASCIIBuf, -1, wch, UniCodeLen);
然后
DWORD dwUtf8Len=WideCharToMultiByte(CP_UTF8, 0, wch, UniCodeLen , NULL, NULL, NULL, NULL );
最后
WideCharToMultiByte(CP_UTF8, 0, wch, UniCodeLen , pUtf8Buf, dwUtf8Len, NULL, NULL );