CoInitialize(NULL);//初始化COM套件
CoUninitialize();//釋放COM套件

static bool isCoInitialize = false; //是否是自己進行的初始化
int WINAPI DllEntryPoint(HINSTANCE hinst, unsigned long reason, void* lpReserved)
{
  if(reason==DLL_PROCESS_ATTACH)
  {
    if(ConInitialize(NULL) == S_OK) isCoInitialize = true;
  }
  if(reason==DLL_PROCESS_DETACH)
  {
    if(isCoInitialize) CoUninitialize();
    //是自己初始化的才釋放，否則由其他初始化的地方自行釋放，
    //防止錯誤的釋放導(dǎo)致別的調(diào)用者失敗
  }
  return 1;
}