C++ 获取UUID

#include <string>
#include <stdio.h>
#if defined(WIN32)||defined(WINCE)||defined(WIN64)
#include <objbase.h>
#else
#include <uuid/uuid.h>
#endif

std::string GetUUID(std::string& strUUID)
{
    strUUID = "";
#if defined(WIN32)||defined(WINCE)||defined(WIN64)
    GUID guid;
    if ( !CoCreateGuid(&guid) )
    {
        char buffer[] = {};
        _snprintf_s(buffer, sizeof(buffer),
            //"%08X%04X%04X%02X%02X%02X%02X%02X%02X%02X%02X",    //大写
            "%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x",        //小写
            guid.Data1, guid.Data2, guid.Data3,
            guid.Data4[], guid.Data4[], guid.Data4[],
            guid.Data4[], guid.Data4[], guid.Data4[],
            guid.Data4[], guid.Data4[]);
        strUUID = buffer;
    }
#else
    uuid_t uu;
    uuid_generate(uu);
#endif
    return strUUID;
}