dear all:
I'm trying to use nsIObserver in C++ and JS ,in order to make callbacks just
through observerservice .everything goes fine except for this :
1.in C++:
I defined a new interface IMyComponent which inherits from nsIObserver,not
directly from nsISupports,because i want to implement my observe().when exec
xpidl.exe,it doesn't emit Observe() into IMyComponent.h .so i have to copy
it from nsIObserver.h .and then i defined a new class
MyComponent:IMyComponent .
/////////////////////////////////////////////
IMyComponent.idl
////////////////////////////////////////////
#include "nsISupports.idl"
#include "nsIObserver.idl"
[scriptable, uuid(90758A97-A6F3-4ea4-8953-16BD2EE3A977)]
interface IMyComponent : nsIObserver //nsISupports
{
void NotifyMe();
};
/////////////////////////////////////////////
MyComponent.CPP
///////////////////////////////////////////////////
#include "StdAfx.h"
#include "MyComponent.h"
NS_IMPL_ISUPPORTS1(MyComponent, IMyComponent)
MyComponent::MyComponent()
{
NS_GetServiceManager(getter_AddRefs(m_pServiceManager));
m_pServiceManager->GetServiceByContractID("@mozilla.org/observer-service;1",
NS_GET_IID(nsIObserverService), getter_AddRefs(m_pObserverService));
m_pObserverService->AddObserver(this,SM_TOPIC_TEST,false);
m_pObserverService->NotifyObservers(NULL, SM_TOPIC_TEST, L"SM-XPCOM:
notify all");
}
MyComponent::~MyComponent()
{
/* destructor code */
m_pObserverService->RemoveObserver(this,SM_TOPIC_TEST);
}
/* void NotifyMe (); */
NS_IMETHODIMP MyComponent::NotifyMe()
{
MessageBox(0,"You must have pushed notify button on xul","from
MyComponent::NotifyMe()",0);
if(m_pObserverService){
m_pObserverService->NotifyObservers(NULL,SM_TOPIC_TEST,L"from dll");
m_pObserverService->NotifyObservers(this,SM_TOPIC_TEST,L"from
MyComponent::this");
MyComponent* x = new MyComponent();
m_pObserverService->AddObserver(x,SM_TOPIC_TEST,false);
m_pObserverService->NotifyObservers(x,SM_TOPIC_TEST,L"from MyComponent's
child: m_pObServer");
}
else
MessageBox(0,"null observer","from dll",0);
return NS_OK;
}
/* void observe (in nsISupports aSubject, in string aTopic, in wstring
aData); */
NS_IMETHODIMP MyComponent::Observe(nsISupports *aSubject, const char
*aTopic, const PRUnichar *aData)
{
MessageBox(0,"","data",0);
return NS_OK;
}
//////////////////////////////////////////////////////
well ,compiling and linking are all ok ,when executes ,the result is : only
my JS observers get the topic ,moreover ,
JS received all the topics which are soppused to be sent to MyComponent and
x :
1. m_pObserverService->NotifyObservers(NULL,SM_TOPIC_TEST,L"from dll");
2. m_pObserverService->NotifyObservers(x,SM_TOPIC_TEST,L"from
MyComponent's child: m_pObServer");
3. m_pObserverService->NotifyObservers(this,SM_TOPIC_TEST,L"from
MyComponent::this");
above : x and this are inherited from nsIObserver ,why cannot they behave as
Observer ? why can JS's observer take over the topics that are sent to (x
and this ) ?
Thank you all for reading and answer me :P I'm puzzled...
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