ActiveX calling javascript functions

10. května 2012 20:30

I have seen questions similar to mine out there but I'm not running into the same problems. Here are the steps I followed in hopes someone could point me to my error.

1. ATL Project (called Sample)

2. Add class (ATL Simple Object) called Dog

3 Checked connection points & IObjectwithSite

4. Added a method to the events, my .idl file:

import "oaidl.idl";
import "ocidl.idl";

[
	object,
	uuid(D3299028-F05E-4341-A686-AB2DBC844DF5),
	dual,
	nonextensible,
	helpstring("IDog Interface"),
	pointer_default(unique)
]
interface IDog : IDispatch{
};
[
	uuid(48BE55E1-A592-43BF-89CD-E4A8A45F8988),
	version(1.0),
	helpstring("Sample 1.0 Type Library")
]
library SampleLib
{
	importlib("stdole2.tlb");
	[
		uuid(E6BA2F52-0796-4446-8EED-1D00E353F647),
		helpstring("_IDogEvents Interface")
	]
	dispinterface _IDogEvents
	{
		properties:
		methods:
            [id(1), helpstring("method bark")] void bark();
	};
	[
		uuid(3C47225F-64EF-4343-B649-12CB510FEF50),
		helpstring("Dog Class")
	]
	coclass Dog
	{
		[default] interface IDog;
		[default, source] dispinterface _IDogEvents;
	};
};

5. Add/Implement Connection Point (_IDogEvents), my _IDOGEvents_CP.h:

#pragma once

template<class T>
class CProxy_IDogEvents : public IConnectionPointImpl<T, &__uuidof(_IDogEvents)>
{
public:
	HRESULT Fire_bark()
	{
		HRESULT hr = S_OK;
		T * pThis = static_cast<T *>(this);
		int cConnections = m_vec.GetSize();

		for (int iConnection = 0; iConnection < cConnections; iConnection++)
		{
			pThis->Lock();
			CComPtr<IUnknown> punkConnection = m_vec.GetAt(iConnection);
			pThis->Unlock();

			IDispatch * pConnection = static_cast<IDispatch *>(punkConnection.p);

			if (pConnection)
			{
				DISPPARAMS params = { NULL, NULL, 0, 0 };
				hr = pConnection->Invoke(1, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_METHOD, &params, NULL, NULL, NULL);
			}
		}
		return hr;
	}
};

6 Added IProvideClassInfo2Impl & IObjectSafetyImpl to the class and added IProvideClassInfo,IProvideClassInfo2, IObjectSafety to the COM Map

My Dog.h file:

#pragma once
#include "resource.h"       // main symbols
#include "Sample_i.h"
#include "_IDogEvents_CP.h"

class ATL_NO_VTABLE CDog :
	public CComObjectRootEx<CComSingleThreadModel>,
	public CComCoClass<CDog, &CLSID_Dog>,
	public IConnectionPointContainerImpl<CDog>,
	public CProxy_IDogEvents<CDog>,
	public IObjectWithSiteImpl<CDog>,
        public IProvideClassInfo2Impl<&CLSID_Dog, &__uuidof(_IDogEvents), &LIBID_SampleLib>,
        public IObjectSafetyImpl<CDog,INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA>,
	public IDispatchImpl<IDog, &IID_IDog, &LIBID_SampleLib, 1, 0>
{
public:
	CDog()
	{
        MessageBoxA(NULL,"Dog init","1",MB_ICONINFORMATION);
        Fire_bark();
	}

DECLARE_REGISTRY_RESOURCEID(IDR_DOG)

BEGIN_COM_MAP(CDog)
	COM_INTERFACE_ENTRY(IDog)
	COM_INTERFACE_ENTRY(IDispatch)
	COM_INTERFACE_ENTRY(IConnectionPointContainer)
	COM_INTERFACE_ENTRY(IObjectWithSite)
    COM_INTERFACE_ENTRY(IObjectSafety)
    COM_INTERFACE_ENTRY(IProvideClassInfo)
    COM_INTERFACE_ENTRY(IProvideClassInfo2)
END_COM_MAP()

BEGIN_CONNECTION_POINT_MAP(CDog)
	CONNECTION_POINT_ENTRY(__uuidof(_IDogEvents))
END_CONNECTION_POINT_MAP()


	DECLARE_PROTECT_FINAL_CONSTRUCT()

	HRESULT FinalConstruct()
	{
		return S_OK;
	}

	void FinalRelease()
	{
	}

public:

};

OBJECT_ENTRY_AUTO(__uuidof(Dog), CDog)

Html file

<html>

<body>
<script type="text/javascript">
    function mydog::bark()
        {
        alert("ruff ruff");
        } 
</script>
<object id="mydog" width=10 height=10 border=1 classid="CLSID:3C47225F-64EF-4343-B649-12CB510FEF50">
</body>
</html>

There doesnt seem to be a connection established. Anytime a Fire_xxx event is called the m_vec.GetSize(); returns 0 and nothing will get invoked by the dispatch. What am I missing?

Všechny reakce

10. května 2012 20:37

0

On 5/10/2012 4:30 PM, hapyfishrmn wrote:

CDog()
{
MessageBoxA(NULL,"Dog init","1",MB_ICONINFORMATION);
Fire_bark();

That's too early. Your object is just being created - the script couldn't possibly have received its interface pointer yet, let alone advise its event sink to it.

Igor Tandetnik
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10. května 2012 20:55

Igor,

I tried to call a javascript event to cause the DLL to do something and then make a call to fire the event

<html>

<script type="text/javascript">
    function addSomething()
        {
        var d = document.getElementById("mydog");
        d.Add();
        }
    function mydog::bark()
        {
        alert("ruff ruff");
        } 
</script>
<body>
<a href=javascript:addSomething()>addSomething</a>
<br><br>
<object id="mydog" width=10 height=10 border=1 classid="CLSID:3C47225F-64EF-4343-B649-12CB510FEF50">

</body>
</html>

Dog.cpp

// Dog.cpp : Implementation of CDog

#include "stdafx.h"
#include "Dog.h"


CDog::CDog()

{
MessageBoxA(NULL,"Dog init","1",MB_ICONINFORMATION);
}

STDMETHODIMP CDog::Add()

{
MessageBoxA(NULL,"Add","1",MB_ICONINFORMATION);
Fire_bark();
return 0;
}

In this case I get the same thing, no connections. Should I create a thread and try this same sort of thing?

10. května 2012 21:54

0
On 5/10/2012 4:55 PM, hapyfishrmn wrote:

In this case I get the same thing, no connections.

On a hunch, try placing the <script> tag below <object> tag.

Igor Tandetnik
- Označen jako odpověď hapyfishrmn 11. května 2012 19:56
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11. května 2012 13:27

0

Same as before no connections
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11. května 2012 16:52

0

On 5/11/2012 9:27 AM, hapyfishrmn wrote:

Same as before no connections

I don't see anything obviously wrong in your code, and similar code worked for me in the past. If you'd like to send a reasonably small sample reproducing the problem to me at itandetnik@mvps.org, I'll look at it.

Igor Tandetnik
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11. května 2012 20:01

Igor many thanks to you,

For those who come later there where 2 problems:

1) no closing </object>

2)if you are using the notation in Javascript "mydog::bark" then the script must be below the <object>

using the notation: "mydog::bark"

<html>

<body>
<a href=javascript:addSomething()>addSomething</a>
<br><br>

<object id="mydog" width=10 height=10 border=1 classid="CLSID:3C47225F-64EF-4343-B649-12CB510FEF50"></object>
<script type="text/javascript">
    function addSomething()
        {
        var d = document.getElementById("mydog");
        d.Add();
        }
    function mydog::bark()
        {
        alert("ruff ruff");
        } 
</script>

</body>
</html>

You can alternatively use the "for" "event" notation before the <object> if you need

<html>

<body>
<a href=javascript:addSomething()>addSomething</a>
<br><br>

<script for="mydog" event="bark()">
alert("ruff ruff");
</script>

<script type="text/javascript">
    function addSomething()
        {
        var d = document.getElementById("mydog");
        d.Add();
        }
</script>
<object id="mydog" width=10 height=10 border=1 classid="CLSID:3C47225F-64EF-4343-B649-12CB510FEF50"></object>


</body>

</html>

both worked. Thanks again Igor

Upravený hapyfishrmn 11. května 2012 20:38
Označen jako odpověď hapyfishrmn 11. května 2012 20:38

4. prosince 2012 22:20

0

I have tried this and it doesn't work for me. The first error I get is that there is no "Add()" method on mydog. What is the purpose of this add_something method and the call to Add?
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