C++的GUID的生成代码

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;
}