windows编程潘爱民com讲座

COMCOMDllGetClassObjectDllGetClassObject数调用DllGetClassObject引出–classCNewClass:publicCOldClass包容聚合对象对象对象classclassCB:publicISomeInterface,public{ CB(~CB();HRESULTstdcallQueryInterface(constIID&iid,void**ppv);ULONGstdcallAddRef();ULONGstdcall//ISomeInterfacemembersHRESULTstdcallSomeFunction();//IOtherInterfacemembersHRESULTstdcallOtherFunction();privateISomeInterfaceCB::CB({m_Ref=0;}CB::~CB({if(m_pSomeInterface!=NULL)}HRESULT{HRESULTresult=::CoCreateInstance(CLSID_ComponentA,NULL,CLSCTX_INPROC_SERVER,IID_ISomeInterface,(void**)&m_pSomeInterface);if(FAILED(result)) returnS_OK;}constIID&iid,void{CB HRESULT if(pUnknownOuter!=NULL)returnCLASS_E_NOAGGREGATION;pObj=newCB();if(pObj==NULL)returnif(FAILED(hr))deletepObj;}//Obtainthefirstinterfacepointer(whichdoesanAddRef)hr=pObj->QueryInterface(iid,ppv);return}HRESULTstdcallCB::SomeFunction({returnm_pSomeInterface->SomeFunction(}HRESULTstdcallCB::OtherFunction({}HRESULTHRESULTstdcallCB::SomeFunction({if(...{HRESULTresult=m_pSomeInterface->SomeFunction(return}{}}intFunc1(intx,inty){returnx*y;}intFunc2(intx,inty){returnint(*MyFunc)(int, MyFunc= inta=MyFunc(10, MyFunc=intb=MyFunc(10,classvirtualvoidstdcallMethod1(int,int)=0;virtualvoidstdcallMethod2(int)=0;classvirtualvoidstdcallOperator1(int,int)=0;virtualvoidstdcallOperator2(int)=0;classCMyObject:public指针类型并不实例化CMyObjectVtable1*p1=代码片断p1->Method1(a,代码片断Vtable2*p2=(Vtable2*)p1;p2->Operator1(a,b);对象外外义classCB:public{CB(~CBHRESULTstdcallQueryInterface(constIID&iid,void**ppv);ULONGstdcallAddRef();ULONGstdcall//IOtherInterfacemembersHRESULTstdcallOtherFunction();HRESULTprivateIUnknown*m_pUnknownInner;//pointertoA's{if(iid==IID_IUnknown)*ppv=(IUnknown*)this;((IUnknown*)(*ppv))->AddRef()}elseif(iid==IID_OtherInterface)*ppv=(IOtherInterface*)this;}elseif(iid==IID_SomeInterface)returnm_pUnknownInner->QueryInterface(iid,ppv)}else*ppv=}return}2.委托IUnknown(1)当对象被聚合时，调用外部对象的IUnknown(2)当对象未被聚合时，调用非委托IUnknown接IOtherInteISomeInteface 为controllingunknown内部对象类厂的e必须检查r参数，如果非L，则表明聚合，内部对象把指针保存起来，但不调用f。若内部对象不支持聚N如果pUnkOuter参数非NULL，并且外部对象请求对于除了非委托版本的Inknon之外的接口，它的三个Inknn调用必须全部委托给外部对象的pnkOtHRESULTCoCreateInstance(constCLSID&IUnknownconstIID&iid,(voidHRESULTconstIID&iid,voidclassCA:publicclassCA:publicISomeInterface,public{内义CA(IUnknown~CA(publicvirtualHRESULTstdcallQueryInterface(constIID&iid,void**ppv);virtualULONGstdcallAddRef();virtualULONGstdcallRelease()virtualHRESULTstdcallconstIID&iid,void**ppv);virtualULONG stdcallNondelegationAddRef();virtual stdcallNondelegationRelease()privateIUnknown*m_pUnknownOuter;//pointertoouterclass{virtualHRESULTstdcallconstIID&iid,void**ppv)=0;virtualULONGstdcallNondelegationAddRef()=0;virtualULONGstdcallNondelegationRelease()=0;HRESULTCA::NondelegationQueryInterface(constIID&iid,void{if(iid==IID_IUnknown)*ppv=(INondelegatingUnknown*)this;((IUnknown*)(*ppv))->AddRef();}elseif(iid==IID_SomeInterface)*ppv=(ISomeInterface*)this;((ISomeInterface*)(*ppv))->AddRef();}else*ppv=returnE_NOINTERFACE}return}ULONGCA::AddRef{if(m_pUnknownOuter!=NULLreturn}ULONGCA::Release{}HRESULTCA::QueryInterface(constIID&iid,void{if(m_pUnknownOuter!=NULL}厂的CreateInstance函数与包容模型相同。但{HRESULTresult=::CoCreateInstance(CLSID_ComponentA,pUnknownOuter,CLSCTX_INPROC_SERVER,if}CB::~CB({if(m_pUnknownInner!=NULL)m_pUnknownInner->Release();}CA::CA(IUnknown{CA::CA(IUnknown{m_pUnknownOuter=}constIID&iid,void{内//iidmustbeIID_IUnknownforif((pUnknownOuter!=NULL)&&(iid!=IID_IUnknown)部return对象//CreatetheobjectpassingfunctiontonotifyonCA*pObj=newCA创的if(pObj==NULL)return创建//Obtainthefirstinterfacepointer(whichdoesanAddRef)HRESULThr=pObj->NondelegatingQueryInterface(iid,ppv);returnhr;建}HRESULT{IUnknown*pUnknownOuter=(IUnknownHRESULTresult=::CoCreateInstance(CLSID_CompA,pUnknownOuter,IID_IUnknown,(void**)&m_pUnknownInner);if(FAILED(result))returnE_FAIL;result=m_pUnknownInner->QueryInterface(IID_ISomeInterface,(void**)&m_pSomeInterface);if{}returnS_OK;}constIID&iid,void{CB*pObj;HRESULThr;if(NULL!=pUnknownOuter)returnpObj=newCB();returnpObj->AddRef();//TheReferencecountofpObjis1hr=pObj->Init();if(FAILED(hr)) g_CompBNumber--;deletereturnE_FAIL;}hr=pObj->QueryInterface(iid,ppv); //TheReferencecountofpObjis1returnhr;}CB::~CB({m_Ref=IUnknown*pUnknownOuter=this;pUnknownOuter->AddRef();if(m_pSomeInterface!=NULL)if(m_pUnknownInner!=NULL)}（客户进程（组件进程（1）自定义列集法(custommarshaling)或基本列集法(basicmarshalingarchitecture)（2）标准列集法(standard列集：找到代理对象的CLSD象；列集数据包，包括跨进程信息。这些信息被称为对象引用(saedobtfeene)散集：客户进程中，根据传输过来的CLSD代理对象，并且把列集数据包传给代理对象。代理对象向客户返回一个接口指针。HRESULTCoMarshalInterface(IStream*pStm,REFIIDriid,IUnknown*pUnk,void*dwDestContext,unsignedlongpvDestContext,unsignedlongmshlflagsHRESULTCoUnmarshalInterface(IStreamREFIIDriid省代理对象，其CLSID为CLSID_StdMarshal)。classIMarshal:public{HRESULTGetUnmarshalClass(...)=0;HRESULTGetMarshalSizeMax(...)=0;HRESULTMarshalInterface(...)=0;HRESULTUnmarshalInterface(...)=0;HRESULTDisconnectObject(...)=0;HRESULTReleaseMarshalData(...)=0;调用IMarshal::UnmarshalInterface，把stream中的数据传给proxy，proxy根据而这个对象使用custom① ③调用类厂对对象不需要实现Irshal，COM提供代理对象，其CLI为CLI_tdarhal跨进程通信被抽象成RC通道，RC通道也是一个COM对象COMORPC建立在MSRPC基础上MSRPC{HRESULTGetBuffer(RPCOLEMESSAGEREFIIDriid)=HRESULTSendReceive(RPCOLEMESSAGEULONG*pStatus)=0;HRESULTFreeBuffer(RPCOLEMESSAGEpMessage)=0;HRESULTGetDestCtx(DWORD*pdwDestCtx,HRESULTIsConnected()=0;{HRESULTConnect(IRpcChannelBuffer*pRpcChannelBuffer)=0; Disconnect()=0;{ Connect(IUnknown*pUnkServer)=0; Disconnect()=0; Invoke(RPCOLEMESSAGEIRpcChannelBuffer*pChannel)=0;IRPCStubBuffer*IsIIDSupported(REFIIDiid)=0; CountRefs()=0; DebugServerQueryInterface(void**ppv)=0; DebugServerRelease(void*pv)=0;存根管理器通过Cnt方法把接口存根与目标对象联系起来clsid=LookUpInRegistry(iid);CoGetClassObject(clsid,clsid=LookUpInRegistry(iid);CoGetClassObject(clsid,CLSCTX_SERVER,NULL,IID_IPSFactoryBuffer,&pPSFactory));pPSFactory->CreateProxy(pUnkOuter,riid,&pProxy,clsid=LookUpInRegistry(iid);CoGetClassObject(clsid,CLSCTX_SERVER,NULL,IID_IPSFactoryBuffer,&pPSFactory));pPSFactory->CreateStub(iid,pUnkServer,如果是接口指针，调用如果是接口指针，则调用调用返回：对象-〉客户，处理[t]、nout参数及返回值在CGtCassObt函数内部，它找到EE组件的程序位置后，启动组件进程，等待...组件进程启动后，调用CoIntialze初始化，创建所有的类厂，调用CRegieCassObt把类厂注