我正在尝试使用工厂创建 COM 对象的实例。
我的服务器代码是:
int main(int, char* argv[])
{
HRESULT result = CoInitializeEx(NULL, COINIT_MULTITHREADED);
Factory factory;
DWORD regID = 0;
result = CoRegisterClassObject(CLSID_InterractionInterfaceFactory, (IClassFactory*) &factory, CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, ®ID);
MSG ms;
while(GetMessage(&ms, 0, 0, 0))
{
TranslateMessage(&ms);
DispatchMessage(&ms);
}
CoRevokeClassObject(regID);
CoUninitialize();
return 0;
}
我的客户代码是:
int main(int, char*[])
{
HRESULT result;
result = CoInitialize(NULL);
IClassFactory* factory = NULL;
result = CoGetClassObject(CLSID_InterractionInterfaceFactory, CLSCTX_LOCAL_SERVER, NULL, IID_IClassFactory, (void**)&factory);
if (S_OK == result)
{
IInterractionInterface* iface = NULL;
result = factory->CreateInstance(NULL, IID_InterractionInterface, (void**)&iface);
**// HERE IT RETURNS E_UNEXPECTED**
}
CoUninitialize();
return 0;
}
我的 QueryInterface 方法:
STDMETHODIMP InterractionInterface::QueryInterface(REFIID riid, LPVOID FAR * ppv)
{
*ppv = NULL;
if (riid == IID_IUnknown)
{
*ppv = (IUnknown*)this;
}
if (riid == IID_InterractionInterface)
{
*ppv = (IInterractionInterface*)this;
}
else
{
*ppv = NULL;
return E_NOINTERFACE;
}
reinterpret_cast<IUnknown*>(*ppv)->AddRef() ;
return S_OK;
}
我不明白我做错了什么。它进入 QueryInterface,对象有效,引用计数器递增,我从 Factory::CreateInstance(..., LPVOID* obj) S_OK 返回,并且 obj 填充成功,但客户端得到空对象并返回代码 E_UNEXPECTED。
我做错了什么?
我的互动是:
DEFINE_GUID(CLSID_InterractionInterfaceFactory, 0x84d55f4a, 0xff3c, 0x43b2, 0xa1, 0xa3, 0x3a, 0xd3, 0xe9, 0x96, 0xc4, 0x26);
DEFINE_GUID(IID_InterractionInterface, 0xc191f3ac, 0x79e1, 0x4be3, 0xbb, 0x87, 0xac, 0x7a, 0xb8, 0x24, 0xd6, 0xb9);
class IInterractionInterface : public IUnknown
{
public:
STDMETHOD (Test(int)) PURE;
};