跨平台生成GUID/UUID

#ifndef XGUID_H
#define XGUID_H

#include <string>
#include <stdio.h>
#ifdef WIN32
#include <objbase.h>
#else
#include <uuid/uuid.h>

typedef struct _GUID
{
    unsigned long Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char Data4[8];
} GUID, UUID;
#endif

namespace XGUID
{
GUID CreateGuid()
{
    GUID guid;
#ifdef WIN32
    CoCreateGuid(&guid);
#else
    uuid_generate(reinterpret_cast<unsigned char *>(&guid));
#endif
    return guid;
}

std::string GuidToString(const GUID &guid)
{
    char buf[64] = {0};
#ifdef __GNUC__
    snprintf(
#else // MSVC
    _snprintf_s(
#endif
                buf,
                sizeof(buf),
                 "{%08X-%04X-%04X-%02X%02X-%02X%02X%02X%02X%02X%02X}",
                guid.Data1, guid.Data2, guid.Data3,
                guid.Data4[0], guid.Data4[1],
                guid.Data4[2], guid.Data4[3],
                guid.Data4[4], guid.Data4[5],
                guid.Data4[6], guid.Data4[7]);
        return std::string(buf);
}

std::string CreateGuidString()
{
    return GuidToString(CreateGuid());
}

}//namespace

#endif // XGUID_H

eg:

QString str1(XGUID::CreateGuidString().c_str());

http://blog.csdn.net/itjobtxq/article/details/8224676