Re: problem with IWbemService.ExecNotificationQuery()

From: Philip Nunn [MSFT] (pnunn_at_online.microsoft.com)
Date: 07/07/04 

Date: Tue, 6 Jul 2004 17:26:48 -0700

It seems that ExecQuery (preferred) or ExecQueryAsync will suit your needs.
The ExecNotificationQuery calls are for obtaining real-time events such as
changes to data, actions, etc. Since you just want to obtain informational
objects and read the properties, the classes used are not event classes. 

-- 
Philip Nunn [MSFT]
This posting is provided "AS IS" with no warranties, and confers no rights. 
Use of included script samples are subject to the terms specified at 
http://www.microsoft.com/info/cpyright.htm.
"rayudu_kamma" <rayudukamma@discussions.microsoft.com> wrote in message 
news:4A1A78A4-E898-41A5-B6EF-562E66BCFDDF@microsoft.com...
> Hi,
> Im trying to get the network interface details using WMI.
> I could get it if I use ExecQuery() but couldn't if I go for either sync. 
> Notification or Asyn.Notification query. As I've to collect the details 
> from all the systems in LAN I think Async.Notification could help me a 
> lot.
> I m giving my code part .
> Pls help me.
> Thank you very much.
> Regards,
> Rayudu.
>
>
>
> {
> HRESULT hr;
> hr=CoInitializeEx(NULL,COINIT_MULTITHREADED);//COINIT_APARTMENTTHREADED);//hr=CoInitialize(NULL);
> if(hr==S_OK)
> AfxMessageBox((CString)"sok");
> else {AfxMessageBox((CString)"faild in initializing the com");
> return false;
> }
> if(hr==S_FALSE)
> {
> AfxMessageBox((CString)"s false. ie already installed");
> }
> if(hr==RPC_E_CHANGED_MODE)
> {
> AfxMessageBox((CString)"changed mode. ie prev ex did it");
> }
> hr=CoInitializeSecurity(NULL,-1,NULL,NULL,RPC_C_AUTHN_LEVEL_NONE,RPC_C_IMP_LEVEL_IMPERSONATE,NULL,EOAC_NONE,0);
> if(hr==S_OK)
> AfxMessageBox((CString)"Indicates success.");
> if(hr==RPC_E_TOO_LATE)
> AfxMessageBox((CString)"CoInitializeSecurity has already been called.");
> if(hr==RPC_E_NO_GOOD_SECURITY_PACKAGES)
> {
> AfxMessageBox((CString)"asAuthSvc was not NULL, and none of the 
> authentication services in the list could be registered. Check the results 
> saved in asAuthSvc for authentication service-specific error codes.");
> }
> IWbemLocator *iloc=NULL;
> IWbemServices *iserv=NULL;
> MULTI_QI mqi[1];
> memset(mqi,0,sizeof(MULTI_QI));
> COSERVERINFO serverinfo;
> memset(&serverinfo,0,sizeof(COSERVERINFO));
> serverinfo.pwszName=_bstr_t(details.server);
> mqi[0].hr=hr;
> mqi[0].pIID=&IID_IWbemLocator;
> mqi[0].pItf=iloc;
> hr=CoCreateInstanceEx(CLSID_WbemLocator,0,CLSCTX_INPROC_SERVER,&serverinfo,1,mqi);
> if(hr!=S_OK)
> return false;
> iloc=(IWbemLocator *)mqi[0].pItf;
> hr=iloc->ConnectServer(details.snamespace,details.user,details.pwd,NULL,0,NULL,NULL,&iserv);
> CString tstr="";
> if(hr==WBEM_E_ACCESS_DENIED) tstr="The current or specelse ified user name 
> and password were not valid or authorized to make the connection.";
> else if(hr==WBEM_E_FAILED) tstr="This indicates other unspecelse ified 
> errors. ";
> else if(hr==WBEM_E_INVALID_NAMESPACE) tstr="The specelse ified namespace 
> did not exist on the server.";
> else if(hr==WBEM_E_INVALID_PARAMETER) tstr="An invalid parameter was 
> specelse ified.";
> else if(hr==WBEM_E_OUT_OF_MEMORY) tstr="There was not enough memory to 
> complete the operation.";
> else if(hr==WBEM_E_TRANSPORT_FAILURE) tstr="This indicates the failure of 
> the remote procedure call (RPC) link between the current process and 
> Windows Management.";
> else if(hr==WBEM_E_LOCAL_CREDENTIALS) tstr="WMI is passing the user 
> credential on local connection.";
> else if(hr==WBEM_S_NO_ERROR) tstr="The call succeeded.";
> {
> tstr +="  :   this is abt connect server";
> AfxMessageBox(tstr);
> }
> HRESULT hrr;
> CString tmp="";
> hrr=CoSetProxyBlanket(iserv,RPC_C_AUTHN_WINNT,RPC_C_AUTHZ_NONE,NULL,RPC_C_AUTHN_LEVEL_DEFAULT,RPC_C_IMP_LEVEL_IMPERSONATE,NULL,EOAC_NONE);
> if(hrr==S_OK)
> tmp="Success.";
> else if(hrr==E_INVALIDARG)
> tmp="One or more arguments is invalid.";
> else tmp="some thing else happend";
> tmp ="cosetproxyblanket result of iwbemservices : "+tmp;
> AfxMessageBox(tmp);
> tmp="";
> IEnumWbemClassObject *icobj=NULL;
> BSTR wql=_bstr_t(_T("WQL"));
> IEnumWbemClassObject *pEnumServices = NULL;
> // MyIWbemObjectSink *objsink=NULL; ****  I implemented this class for 
> IWbemObjectSink n I kept it aside as its not working for me.
> MyIWbemObjectSink *msink=new MyIWbemObjectSink();
> msink->AddRef();
> IWbemObjectSink *objsink=msink;
>
> IEnumWbemClassObject *enumclsobj=NULL;
> hrr=iserv->ExecNotificationQuery(wql,details.query,WBEM_FLAG_FORWARD_ONLY 
> | WBEM_FLAG_RETURN_IMMEDIATELY,0,&enumclsobj);
> DWORD ddw=GetLastError();
> if(hrr==WBEM_E_ACCESS_DENIED) AfxMessageBox((CString)"The current user is 
> not authorized to view the result set. ");
> else if(hrr==WBEM_E_FAILED) AfxMessageBox((CString)"This indicates other 
> unspecified errors. ");
> else if(hrr==WBEM_E_INVALID_CLASS) AfxMessageBox((CString)"The query 
> specifies a class that does not exist. ");
> else if(hrr==WBEM_E_INVALID_PARAMETER) AfxMessageBox((CString)"An invalid 
> parameter was specified. ");
> //if(hrr==WBEM_E_REGISTRATION_TOO_PRECISE) AfxMessageBox((CString)"Too 
> much precision in delivery of events has been requested. A larger polling 
> tolerance should be specified. ");
> //if(hrr==WBEM_E_REGISTRATION_TOO_BROAD) AfxMessageBox((CString)"The query 
> requests more information than Windows Management can reasonably provide. 
> This message is returned when an event query results in a request to poll 
> all objects in a namespace. ");
> else if(hrr==WBEM_E_INVALID_QUERY) AfxMessageBox((CString)"The query was 
> not syntactically valid. ");
> else if(hrr==WBEM_E_INVALID_QUERY_TYPE) AfxMessageBox((CString)"The 
> requested query language is not supported. ");
> else if(hrr==WBEM_E_OUT_OF_MEMORY) AfxMessageBox((CString)"There was not 
> enough memory to complete the operation. ");
> else if(hrr==WBEM_E_TRANSPORT_FAILURE) AfxMessageBox((CString)"This 
> indicates the failure of the remote procedure call (RPC) link between the 
> current process and Windows Management. ");
> else if(hrr==WBEM_E_SHUTTING_DOWN) AfxMessageBox((CString)"Windows 
> Management service was probably stopped and restarted. A new call to 
> ConnectServer is needed. ");
> else if(hrr==WBEM_E_UNPARSABLE_QUERY) AfxMessageBox((CString)"The query 
> could not be parsed. ");
> else if(hrr==WBEM_S_NO_ERROR) AfxMessageBox((CString)"The call 
> succeeded.in sync. notification query ");
> else AfxMessageBox((CString)"something else happend here");
> //here the out put is something else happend here.
>
>
> /*
>
> hrr=iserv->ExecNotificationQueryAsync(wql,details.query,WBEM_FLAG_SEND_STATUS,NULL,objsink);
> DWORD ddw=GetLastError();
> if(hrr==WBEM_E_FAILED) tmp="This indicates other unspecified errors. ";
> else if(hrr==WBEM_E_INVALID_CLASS) tmp="The query specifies a class that 
> does not exist. ";
> else if(hrr==WBEM_E_INVALID_PARAMETER) tmp="An invalid parameter was 
> specified. ";
> //else if(hrr==WBEM_E_REGISTRATION_TOO_PRECISE) tmp="Too much precision in 
> delivery of events has been requested. A larger polling tolerance should 
> be specified. ";
> //else if(hrr==WBEM_E_REGISTRATION_TOO_BROAD) tmp="The query requests more 
> information than WMI can reasonably provide. This message is returned when 
> an event query results in a request to poll all objects in a namespace. ";
> else if(hrr==WBEM_E_INVALID_QUERY) tmp="The query was not syntactically 
> valid. ";
> else if(hrr==WBEM_E_INVALID_QUERY_TYPE) tmp="The requested query language 
> is not supported. ";
> else if(hrr==WBEM_E_OUT_OF_MEMORY) tmp="There was not enough memory to 
> complete the operation. ";
> else if(hrr==WBEM_E_SHUTTING_DOWN) tmp="Windows Management service was 
> probably stopped and restarted. A new call to ConnectServer is needed. ";
> else if(hrr==WBEM_E_TRANSPORT_FAILURE) tmp="This indicates the failure of 
> the remote procedure call (RPC) link between the current process and 
> Windows Management. ";
> else if(hrr==WBEM_E_UNPARSABLE_QUERY) tmp="The query could not be parsed. 
> ";
> else if(hrr==WBEM_S_NO_ERROR) tmp="The call succeeded. ";
> else tmp="something else happend";
> tmp ="execnotificationqueryasync  result : "+tmp;
> AfxMessageBox(tmp);
> */
>
> iserv->CancelAsyncCall(objsink);
> objsink->Release();
> return true;
> }

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