VC编写的OPC 服务器编译连接后，用Kepware的客户端测试程序连接时报错！

错误：CoCreateInstance:没有注册类别

请教各位大侠：用进程内COM组件创建OPC服务器时，是不是要先初始化COM库和创建COM对象？部分代码如下：

//动态链接库主函数

BOOL APIENTRY DllMain(HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{

switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
{
InitDeviceBuffer();

hInstance = (HMODULE)hModule;

InitParm();

InitOPCServer(hInstance, &OPCServerInfo ,
&OPCRegInfo, &VendorInfo,ReadVariant,WriteVariant);

break;
}
case DLL_THREAD_ATTACH://DLL在加载过程中要CALL多次，添加Tag操作只需一次
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}

/////进程内组件标准函数
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppvOut)
{
HRESULT hr;
hr = DLL_GetClassObject(rclsid, riid, ppvOut);
if(SUCCEEDED(hr))
{
if(!bCalled)
{
LoadDeviceTag();
bCalled = true;
}
}
return hr;
}

STDAPI DllCanUnloadNow(void)
{
return DLL_CanUnloadNow();
}

STDAPI DllRegisterServer(void)
{
return DLL_RegisterServer();
}

STDAPI DllUnregisterServer(void)
{
return DLL_UnregisterServer();
}