C++生成GUID

#include <objbase.h>
#include <stdio.h>

//--生成GUID
const char* newGUID()
{
    static char buf[64] = {0};
    GUID guid;
    if (S_OK == ::CoCreateGuid(&guid))
    {
        _snprintf(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 (const char*)buf;
}

int main(int argc, char* argv[])
{
    //--COM
    CoInitialize(NULL);

    printf(newGUID());
    printf("\r\n");

    //--COM
    CoUninitialize();

    return 0;
}