Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C# - COM Discussion Boards

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

10-Mar-08 13:08

I have a large application that has a DLL, written initially a few years ago. It is Unmanaged C++ code, a COM object, and the solution that includes the DLL has been migrated to Visual Studio 2005. So far no problem.

A C# .NET 1.1 Class Library was written in VS .NET 2003.
I need to access the above from the Unmanaged C++ COM DLL.

I am using COM Interop
I wrote a C# .NET 2.0 Wrapper class that wraps the C# .NET 1.1 Class Library.
I added a new class to a C++ Static Lib that is linked into the C++ Unmanaged DLL. This class uses COM methods to invoke methods in the C# .NET 2.0 wrapper, which in turn calls the methods in the C# .NET 1.1 Class Library.
I wrote a simple C++ Unmanaged Console app that makes the necessary to call the methods in the C# Class Libraries. This work fine.

When I build the C++ Unmanaged DLL, that has the static lib linked it builds fine. But ever since I added the one class that calls the C# Class Library wrapper, when I try and register, via Add New Component in Component Services, the C++ Unmanaged DLL, the Add New Component hangs after I select the DLL. It does move on to the next window.

The order after I bring up Component Services is Component Services->Computers->My Computer->COM+ Applications->MyAppName->Components->New, etc.

Both C# .NET Class Libraries are in the GAC, and I have run RegAsm on both. I am looking for any ideas on how to debug what is going wrong, tools that may give me an error message, etc.

THX
Scott

Scott Dorman10-Mar-08 15:46

10-Mar-08 15:46

scottdj wrote:
A C# .NET 1.1 Class Library was written in VS .NET 2003.
I need to access the above from the Unmanaged C++ COM DLL.

You need to access the C# 1.1 dll from the unmanaged C++ COM dll? This doesn't really make sense.

scottdj wrote:
I wrote a C# .NET 2.0 Wrapper class that wraps the C# .NET 1.1 Class Library.

Why do this? It would be better to rewrite the code directly in the C# 2.0 class.

From what I see here you have the following situation:

Unmanaged C++ COM object
C# 1.1 library that is called from the unmanaged C++ COM object
C# 2.0 class that wraps the C# 1.1 class

I think part of the problem you are running in to is the fact that this is running under Component Services, so you don't really have any control over which version of the runtime will be loaded (it will always load the latest version of the runtime, regardless of what version the assembly was compiled against). Also, you can't have one process running different versions of the .NET runtime.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

scottdj10-Mar-08 17:22

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

10-Mar-08 17:22

I didn't write the C# .NET 1.1 Class Library, and am supposed to use as is. So, some of the code I have control over to modify, but not the C# .NET Class Lib.

The order is:

1) Unmanaged C++ COM Object calls
- It imports the typelib from 2), does COM Interop to 2)
2) C# .NET 2.0 Class Library wrapper for the following:
- Calls the methods in 3) directly
3) C# .NET 1.1 Class Library (which I did not write)

Part of the problem was the existing code, which a a global var of a Unmanaged C++ Class, the CTOR was called during the initialization process. I changed that code to not use the global.

I can now register the C++ COM Unmanaged DLL via RegSvr32.exe
It still does not Register via Component Services.

Thanks for the response. Since this involves several different technologies, I didn't know what message board was the most appropriate.
No cross-posting again.

Scott Dorman10-Mar-08 17:43

10-Mar-08 17:43

scottdj wrote:
Thanks for the response. Since this involves several different technologies, I didn't know what message board was the most appropriate.
No cross-posting again.

You're welcome. Deciding which forum is the most appropriate for a complex problem can be difficult. If you aren't sure you can always cross post in a way similar to what you did but be sure to include a link to the original post.

That being said, your explanation makes a bit more sense now. A couple of other questions/clarifications:

You are saying that part of your problem was an issue in the C++ code?
You are trying to register the C++ COM object in Componenet Services?
The C++ object calls in to the C# code as part of the object constructor?

You can try running the Assembly Binding Log Viewer (Fuslogvw.exe)[^] to see if that can help shed any light on what is happening on the .NET side.

Also, to simplify things, you can try temporarily changing the COM object to not call the C# code (assuming that it is doing this in the constructor and it's even possible to take these calls out and still end up with a somewhat valid object) and then try to register it. Essentially you want to determine if the problem is in the COM object registration or in the interop calls.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

scottdj10-Mar-08 18:06

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

10-Mar-08 18:06

The C++ Unmanaged DLL has been around for quite a while, it has been register via Component Services many times without problems.

My initial problem was a global class variable in several DLLs that are implicitly linked to 'The C++ Unmanaged DLL' that I am trying to register.
I added code to one of these linked into 'The C++ Unmanaged DLL' call it A.dll for know, to call the C# .NET 2.0 Class Lib Wrapper, via COM Interop, which in turn calls methods in the C# .NET 1.1 Class Lib.

I got rid of the globals. Before I did this A.dll would not register with RegSvr32.exe, and at least I got some error info, i.e., trying to run managed code during the initialization process. Since RegSvr32 has to load A.dll to call DllRegisterServer, it also has to load the implicitly linked Dlls thus getting into the managed code.

After removing the global, I can now register A.dll via RegSvr32, but when I attempt to register via Component Services, it just hangs.

If indeed you have .NET 1.1 & .NET 2.0 code in a Dll it will use .NET 2.0 for everything then I think we have a problem with this in itself. Not necessarily the cause of Component Services hanging trying to Register A.dll. If indeed the code is running the .NET 2.0 Framework, there must be some mechanism to allow running of older components, at least I hope this is the case.

Hope this makes things a little more clear.

THX

Scott Dorman11-Mar-08 4:33

11-Mar-08 4:33

scottdj wrote:
The C++ Unmanaged DLL has been around for quite a while, it has been register via Component Services many times without problems.

Ok...so you can safely rule out a problem with the registration.

scottdj wrote:
After removing the global, I can now register A.dll via RegSvr32, but when I attempt to register via Component Services, it just hangs.

Try using the Assembly binding log viewer tool I mentioned previously. This will allow you to see what assemblies the loader is trying to read in and where it is trying to read them from.

scottdj wrote:
If indeed you have .NET 1.1 & .NET 2.0 code in a Dll it will use .NET 2.0 for everything then I think we have a problem with this in itself. Not necessarily the cause of Component Services hanging trying to Register A.dll. If indeed the code is running the .NET 2.0 Framework, there must be some mechanism to allow running of older components, at least I hope this is the case.

There is a way to target different runtime versions, see this
MSDN article[^] for more information. That being said, this probably isn't the problem.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

scottdj10-Mar-08 17:48

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

10-Mar-08 17:48

Could you expound on this statement:

>>I think part of the problem you are running in to is the fact that this >>is running under Component Services, so you don't really have any >>control over which version of the runtime will be loaded (it will >>always load the latest version of the runtime, regardless of what >>version the assembly was compiled against). Also, you can't have one >>process running different versions of the .NET runtime.

I have a C++ Unmanaged Console app, that does the COM Interop with the C# .NET 2.0 Class Lib, which in turn calls the C# .NET 1.1 Class Lib. This seems to work fine. So, in this case, nothing is registered via Component Services. I thought that the C# .NET 1.1 Class Lib would use .NET 1.1, and the C# .NET 2.0 Class Lib would use .NET 2.0. Are you saying that this is not the case?

THX
Scott

Scott Dorman11-Mar-08 4:28

11-Mar-08 4:28

I can try...

When you start a .NET application, it must be run inside a specific sandbox (technically an AppDomain). Each process gets one AppDomain that is responsible for running (hosting) that process. Due to the way the runtime actually works, you can't have different versions of the runtime loaded in to the same process.

Normally, when you run an application it uses the version of the runtime that it was compiled against. However, a "third-party" application (such as Component Services) that is unmanaged must load (host) managed code it does so by loading the .NET runtime into it's memory space. The default behavior here is that the unmanaged process will always load the latest version of the runtime available on that machine. This means that if you have .NET 1.1 code it will be loaded and run under a .NET 2.0 environment.

scottdj wrote:
I have a C++ Unmanaged Console app, that does the COM Interop with the C# .NET 2.0 Class Lib, which in turn calls the C# .NET 1.1 Class Lib. This seems to work fine. So, in this case, nothing is registered via Component Services. I thought that the C# .NET 1.1 Class Lib would use .NET 1.1, and the C# .NET 2.0 Class Lib would use .NET 2.0. Are you saying that this is not the case?

In this situation, the C++ console app would host the 2.0 runtime in order to call the C# 2.0 library. In turn, the 1.1 library would also be running under the 2.0 runtime since it is all in the same process space. Normally this isn't an issue. There are ways to target specific runtime versions, see this MSDN article[^] for more information.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

scottdj11-Mar-08 15:25

Re: Component Services->COM+->Add new component hangs, C++ Unmanaged COM DLL using C#

11-Mar-08 15:25

On another note, once I added Guid's to the Interface & Class in the C#.NET 2.0 Class Lib, I was able to add the componet to a COM+ application.

Two questions:

1) I run gacutil & RegAsm as part of the Post Build steps for the C# .NET 2.0 Class Lib. Do I need to run RegAsm, if I am going to add the component to a COM+ application?

2) Do I need to derive my class from System.EnterpriseServices.ServicedComponent to get the COM+ functionality? Remember that what I am adding is an C++ Unmanaged COM DLL, that just happens to link in a static lib that includes code to call the C# .NET 2.0 Class Lib via COM Interop.

THX

Scott Dorman12-Mar-08 2:38

12-Mar-08 2:38

Both excellent questions, unfortunately I'm not sure of the answers.

1. My guess is that you probably do need to run RegAsm since the component is running under a COM application.

2. I think you would only need to derive from ServicedComponent if you were hosting the C# 2.0 library in COM+ directly.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai

Get "Title" information from files

souljumper10-Mar-08 4:10

souljumper

10-Mar-08 4:10

hi,

i tried to write a programm that gives me the "titel" information from files in a folder (if exists)

if my file is a word or excel file it works fine, but if i try to read the titel of an mp3 file (for example) i get the error-reply

STG_E_FILENOTFOUND
A property set of the indicated name does not exist.
http://msdn2.microsoft.com/en-us/library/aa379965(VS.85).aspx[^]

i found this tutorial: http://www.codeproject.com/KB/files/SummInfoPropSetFile.aspx[^]

but i could not figure out me mistake.

here my code that reads the titel information

<br />
const FMTID PropSetfmtid ={<br />
        0xf29f85e0,<br />
        0x4ff9,<br />
        0x1068,<br />
        {0xab, 0x91, 0x08, 0x00, 0x2b, 0x27, 0xb3, 0xd9 }<br />
        };<br />
-------------------------<br />
std::wstring get_titel(std::wstring path)<br />
{<br />
		 HRESULT hr = S_OK;<br />
	     IPropertyStorage *pPropStg = NULL;<br />
		 IPropertySetStorage *pPropSetStg = NULL;<br />
		 PROPSPEC propspec; <br />
		 PROPVARIANT propRead;<br />
<br />
		 hr = StgOpenStorageEx( path.c_str(),<br />
			 STGM_READ | STGM_SHARE_EXCLUSIVE, STGFMT_ANY, 0, NULL, NULL, IID_IPropertySetStorage,<br />
                    reinterpret_cast<void**>(&pPropSetStg) );<br />
<br />
		 if (hr != S_OK)<br />
			 return std::wstring(L"StgOpenStorageEx - ERROR");<br />
<br />
	 <br />
		 hr = pPropSetStg->Open(PropSetfmtid, STGM_DIRECT | STGM_SHARE_EXCLUSIVE | STGM_READ, &pPropStg );<br />
<br />
		 if (hr != S_OK)<br />
			 return std::wstring(L"Open - ERROR");<br />
<br />
<br />
		 propspec.ulKind = PRSPEC_PROPID;<br />
		 propspec.propid  = 0x00000002; //	PIDSI_TITLE<br />
		 		 <br />
<br />
	         hr = pPropStg->ReadMultiple(1, &propspec, &propRead);<br />
<br />
		 if (hr != S_OK)<br />
			 return std::wstring(L"Read - ERROR");<br />
<br />
		 std::string temp = propRead.pszVal;<br />
		 TCHAR rtTC[1024]={0};<br />
		 MultiByteToWideChar(CP_ACP, MB_ERR_INVALID_CHARS, temp.c_str(), static_cast<int>(temp.length()), rtTC, static_cast<int>(temp.length()));<br />
<br />
		 std::wstring rtn = rtTC;<br />
		 	<br />
		 pPropSetStg->Release();<br />
		 pPropStg->Release();	 <br />
		 return rtn;<br />
}<br />
</int></int></void**>

the error usually occurs at this point : "pPropSetStg->Open(...)

does anyone has an idea what i'm doing wrong?

Handling Internet Explorer com server object in plain C++

jattila4010-Mar-08 2:13

jattila40

10-Mar-08 2:13

I have written a small C++ program, what can download a HTML page from a specified URL, and writes its body to a specified file (this is a simple command line utility). It is almost fine, but in few cases the Internet Explorer causes application error (instruction at address xxxx memory address xxxx can not be read, where to xxxx-s are same usually), immediately before my program finishes (or after, I don't know). I suspect, that this is a synchronization problem, may be I destroy some object (IWebBrowser2 or IConnectionPoint) too early, but I am unable to find this bug. I append my source code, please help me to find the bug. The code is commented in english, and in hungarian. Sorry for my english. Thanx in advance.

#include <windows.h><br />
#include <exdisp.h><br />
#include <mshtml.h><br />
#include <stdio.h><br />
#include <winnls.h><br />
#include <comdef.h><br />
#include <conio.h><br />
#include <exdispid.h><br />
//#include <dispatch.h><br />
#include <oleauto.h><br />
<br />
#define WM_CONNECTRELEASE WM_USER+100<br />
#define TIMEOUT 30000 //30 seconds<br />
<br />
#define PUT(x) x<br />
<br />
int DocumentDownloaded=0;<br />
<br />
class Sink : public IDispatch //It is enough to implement only the IDispatch interface instead of DWebBrowserEvents2,<br />
							//becouse we handle all events in IDispath::Invoke function<br />
{<br />
public:<br />
//IUnknown<br />
	virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid,void __RPC_FAR *__RPC_FAR *ppvObject)<br />
	{<br />
		PUT(printf("QueryInterface\r\n");)<br />
		if(riid==IID_IUnknown || riid==IID_IDispatch || riid==DIID_DWebBrowserEvents2 || riid==DIID_DWebBrowserEvents){<br />
			*ppvObject=(void*)this;<br />
			AddRef();<br />
			return S_OK;<br />
		}<br />
		else{<br />
			*ppvObject=NULL;<br />
			return E_NOINTERFACE;<br />
		}<br />
	}  <br />
    <br />
	virtual ULONG STDMETHODCALLTYPE AddRef() <br />
	{<br />
		PUT(printf("AddRef\r\n");) <br />
		//return 1;<br />
		InterlockedIncrement(&m_cRef);<br />
		return m_cRef;<br />
	}  <br />
<br />
	virtual ULONG STDMETHODCALLTYPE Release()<br />
	{<br />
		//return 1;<br />
		if(m_cRef>0)InterlockedDecrement(&m_cRef);<br />
		if(m_cRef==1){<br />
			//az IE befejezte a Sink hasznalatat, meghivhato az IConnectionPoint::Release<br />
			//IE stopped using Sink, we may call IConnectionPoint::Release<br />
			PostMessage(0,WM_CONNECTRELEASE,0,0); //we send message to the message loop<br />
		}<br />
		PUT(printf("Release %d\r\n",m_cRef);)<br />
		return m_cRef;<br />
	}<br />
// IDispatch<br />
	virtual HRESULT STDMETHODCALLTYPE GetTypeInfoCount(UINT __RPC_FAR *pctinfo)<br />
	{<br />
		PUT(printf("GetTypeInfoCount\r\n");)<br />
		return E_NOTIMPL;<br />
	}<br />
<br />
	virtual HRESULT STDMETHODCALLTYPE GetTypeInfo(UINT iTInfo,LCID lcid,ITypeInfo __RPC_FAR *__RPC_FAR *ppTInfo)<br />
	{<br />
		PUT(printf("GetTypeInfo\r\n");) <br />
		return E_NOTIMPL;<br />
	}<br />
 <br />
	virtual HRESULT STDMETHODCALLTYPE GetIDsOfNames(<br />
		/* [in] */ REFIID riid,<br />
		/* [size_is][in] */ LPOLESTR __RPC_FAR *rgszNames,<br />
		/* [in] */ UINT cNames,<br />
		/* [in] */ LCID lcid,<br />
		/* [size_is][out] */ DISPID __RPC_FAR *rgDispId)<br />
	{<br />
		PUT(printf("GetIDsOfNames\r\n");)<br />
		return E_NOTIMPL;<br />
	}<br />
       <br />
	virtual /* [local] */ HRESULT STDMETHODCALLTYPE Invoke(<br />
		/* [in] */ DISPID dispIdMember,<br />
		/* [in] */ REFIID riid,<br />
		/* [in] */ LCID lcid,<br />
		/* [in] */ WORD wFlags,<br />
		/* [out][in] */ DISPPARAMS __RPC_FAR *pDispParams,<br />
		/* [out] */ VARIANT __RPC_FAR *pVarResult,<br />
		/* [out] */ EXCEPINFO __RPC_FAR *pExcepInfo,<br />
		/* [out] */ UINT __RPC_FAR *puArgErr);<br />
//Sink<br />
	Sink(IWebBrowser2 *pWebBrowser,HANDLE fo):m_pWebBrowser(pWebBrowser),m_cRef(1),m_pIConnectionPoint(0),m_dwEventCookie(0),m_hOutputFile(fo)<br />
	{<br />
<br />
	}<br />
<br />
	~Sink()<br />
	{<br />
<br />
	}<br />
<br />
	bool SetupConnectionPoint();<br />
<br />
	void UnadviseConnectionPoint()<br />
	{<br />
		if(m_pIConnectionPoint){<br />
			PUT(printf("Before Connectionpoint Unadvise\r\n");)<br />
			m_pIConnectionPoint->Unadvise(m_dwEventCookie);<br />
			m_dwEventCookie=0;<br />
			//vigyazat szinkronizacios problema!!!<br />
			//az Unadvise utan meg az IE visszahivja a Release (az Invoke-ot talan nem) callbacket.<br />
			//nem szabad tovabbmeni, amig a callbackek le nem futnak.<br />
<br />
			//Be care, synchronization problem may occure!<br />
			//After m_pIConnectionPoint->Unadvise(m_dwEventCookie), IE calls back Sink::Release 4 times,<br />
			//since we must not proceed until the last Sink::Release called by IE, has been finished.<br />
			PUT(printf("Before Connectionpoint Release\r\n");)<br />
			//m_pIConnectionPoint->Release();<br />
			//PUT(printf("After Connectionpoint Release\r\n");)<br />
			//m_pIConnectionPoint=NULL;<br />
		}<br />
	}<br />
<br />
	ULONG ReleaseConnectionPoint()<br />
	{<br />
		ULONG ret=0;<br />
		if(m_pIConnectionPoint!=NULL){<br />
			ret=m_pIConnectionPoint->Release();<br />
			m_pIConnectionPoint=NULL;<br />
		}<br />
		PUT(printf("After Connectionpoint Release\r\n");)<br />
		return ret;<br />
	}<br />
<br />
protected:<br />
<br />
	IWebBrowser2 *m_pWebBrowser;<br />
	IConnectionPoint *m_pIConnectionPoint;<br />
	DWORD m_dwEventCookie;<br />
	LONG m_cRef;<br />
	HANDLE m_hOutputFile;<br />
};<br />
<br />
int DownloadDocument(IWebBrowser2 *pBrowser2,HANDLE fo)<br />
{<br />
	IDispatch *pDoc=NULL;<br />
	IHTMLDocument2 *pHtmlDoc=NULL;<br />
	IHTMLElement *body=NULL;<br />
	HGLOBAL hg=NULL;<br />
	BSTR bstr=NULL;<br />
	HRESULT hr;<br />
	int ret=0;<br />
<br />
	if(!SUCCEEDED(pBrowser2->get_Document(&pDoc))){<br />
		goto vege;<br />
	}<br />
	if(!SUCCEEDED(pDoc->QueryInterface(IID_IHTMLDocument2,(void **)&pHtmlDoc))){<br />
		pHtmlDoc=NULL;<br />
		goto vege;<br />
	}<br />
	if(!SUCCEEDED(pHtmlDoc->get_body(&body))){<br />
		goto vege;<br />
	}<br />
	if(!SUCCEEDED(body->get_innerText(&bstr))){<br />
		goto vege;<br />
	}<br />
	hr=SysStringByteLen(bstr)/2;<br />
<br />
	unsigned long m;<br />
	char c;<br />
	int i;<br />
	for(i=0;i<hr;++i){><br />
		c=bstr[i];<br />
		WriteFile(fo,&c,1,&m,NULL);<br />
	}<br />
	ret=1;<br />
	/*<br />
	if((hg=GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,10000))!=NULL){<br />
		ULARGE_INTEGER size;<br />
		DWORD err;<br />
		IStream* pMyStream;<br />
		ULONG n;<br />
		IPersistStreamInit* pPersist = 0;<br />
<br />
		err=CreateStreamOnHGlobal(hg,TRUE,&pMyStream);<br />
		HRESULT hr=pDoc->QueryInterface(IID_IPersistStreamInit, (void**)&pPersist);<br />
		if (SUCCEEDED(hr) && pPersist){<br />
			if(bstr!=NULL)SysFreeString(bstr);<br />
			CloseHandle(fo);<br />
			hr=pPersist->InitNew();<br />
			hr=pPersist->GetSizeMax(&size);<br />
			hr=pPersist->Save(pMyStream, false);<br />
			hr=S_OK;<br />
			while(hr==S_OK){<br />
				hr=pMyStream->Read((void *)t,1000,&n);<br />
			}<br />
			hr=pMyStream->Read((void *)t,1000,&n);<br />
			pPersist->Release();<br />
		}<br />
	}<br />
	*/<br />
vege:<br />
	if(pHtmlDoc!=NULL)pHtmlDoc->Release();<br />
	return ret;<br />
}<br />
<br />
bool Sink::SetupConnectionPoint()<br />
{<br />
	//Ez a fuggveny a m_pWebBrowser tagban megadott IWebBrowser2 szerver objektumban megkeresi a <br />
	//DWebBrowserEvents2 tipusu connection pointot, es a Sink kliens objektumot (jelen objektum)<br />
	//hozza kapcsolja. A szerver objektum a Sink tagfuggvenyeit mint callback fuggvenyeket<br />
	//fogja meghivni a kulonbozo esemenyek hatasara.<br />
<br />
	//This function searches the DWebBrowserEvents2 type connection point in the IWebBrowser2 type<br />
	//server object (pointed to by m_pWebBrowser member), and connects the Sink object (present object)<br />
	//to it. The IWebBrowser2 server object will call back the member functions of this Sink object.<br />
	IConnectionPointContainer* pIConnectionPointContainerTemp=NULL;<br />
	IUnknown *pIUnknown=NULL;<br />
	bool ret=true;<br />
	/*QI this object itself for its IUnknown pointer which will be used */<br />
	/*later to connect to the Connection Point of the IWebBrowser2 object.*/<br />
	//this -> <br />
	if(!SUCCEEDED(QueryInterface(IID_IUnknown,(void**)&pIUnknown))){<br />
		ret=false;<br />
		pIUnknown=NULL;<br />
		goto vege;<br />
	}<br />
	/* QI IWebBrowser2 for its connection point.*/<br />
	if(!SUCCEEDED(m_pWebBrowser->QueryInterface(IID_IConnectionPointContainer,(void**)&pIConnectionPointContainerTemp))){<br />
		ret=false;<br />
		pIConnectionPointContainerTemp=NULL;<br />
		goto vege;<br />
	}<br />
	if(!SUCCEEDED(pIConnectionPointContainerTemp->FindConnectionPoint(DIID_DWebBrowserEvents2,&m_pIConnectionPoint))){<br />
		ret=false;<br />
		m_pIConnectionPoint=NULL;<br />
		goto vege;<br />
	}<br />
	if(!SUCCEEDED(m_pIConnectionPoint->Advise(pIUnknown,&m_dwEventCookie))){<br />
		ret=false;<br />
		m_dwEventCookie=0;<br />
		m_pIConnectionPoint->Release();<br />
		m_pIConnectionPoint=NULL;<br />
		goto vege;<br />
	}<br />
vege:<br />
	if(pIUnknown!=NULL)pIUnknown->Release();<br />
	if(pIConnectionPointContainerTemp!=NULL)pIConnectionPointContainerTemp->Release();<br />
	return ret;<br />
}<br />
<br />
HRESULT STDMETHODCALLTYPE Sink::Invoke(<br />
		/* [in] */ DISPID dispIdMember,<br />
		/* [in] */ REFIID riid,<br />
		/* [in] */ LCID lcid,<br />
		/* [in] */ WORD wFlags,<br />
		/* [out][in] */ DISPPARAMS __RPC_FAR *pDispParams,<br />
		/* [out] */ VARIANT __RPC_FAR *pVarResult,<br />
		/* [out] */ EXCEPINFO __RPC_FAR *pExcepInfo,<br />
		/* [out] */ UINT __RPC_FAR *puArgErr)<br />
{<br />
	PUT(printf("Invoke %d\r\n",dispIdMember);) <br />
	//GetTypeInfo(0,NULL,&m_ptinfo);<br />
	//return DispInvoke(this,m_ptinfo,dispIdMember, wFlags, pDispParams,pVarResult, pExcepInfo, puArgErr); <br />
	if(dispIdMember==DISPID_DOCUMENTCOMPLETE){<br />
		PUT(printf("Document complete\r\n");)<br />
		IUnknown*  pUnk;<br />
		LPDISPATCH lpWBDisp,lpDisp;<br />
		HRESULT    hr;<br />
<br />
		lpDisp=pDispParams->rgvarg[1].pdispVal;<br />
		//hr = m_pWebBrowser->QueryInterface(IID_IDispatch,(void **)&lpWBDisp);<br />
		hr=m_pWebBrowser->QueryInterface(IID_IUnknown,(void **)&pUnk);<br />
		hr=pUnk->QueryInterface(IID_IDispatch, (void**)&lpWBDisp);<br />
<br />
		if(lpDisp==lpWBDisp){<br />
			// Top-level Window object, so document has been loaded<br />
			PUT(printf("Page complete\r\n");)<br />
			DocumentDownloaded=DownloadDocument(m_pWebBrowser,m_hOutputFile);<br />
			//PostQuitMessage(0);<br />
			HRESULT hr;<br />
			hr=m_pWebBrowser->Quit();<br />
			PUT(printf("Quit %d\r\n",hr);)<br />
		}<br />
<br />
		lpWBDisp->Release();<br />
		pUnk->Release();<br />
		return S_OK;<br />
	}<br />
	else if(dispIdMember==DISPID_ONQUIT){<br />
		//PostQuitMessage(0);<br />
		UnadviseConnectionPoint();<br />
		return S_OK;<br />
	}<br />
	else{<br />
		return E_NOTIMPL;<br />
		//return S_OK;<br />
	}<br />
}<br />
<br />
int main(int argc,char *argv[])<br />
{<br />
	HANDLE fo=INVALID_HANDLE_VALUE;<br />
	int ret=0;<br />
	Sink *psink=NULL;<br />
	IWebBrowser2 *pBrowser2=NULL;<br />
	VARIANT vEmpty;<br />
	WCHAR wurl[MAX_PATH];<br />
	VariantInit(&vEmpty);<br />
	BSTR bstrURL=NULL;<br />
<br />
	DocumentDownloaded=0;<br />
<br />
	if(argc<3){<br />
		printf("\r\Usage: iecom <url> <output file="">");<br />
		return 1;<br />
	}<br />
<br />
	if((fo=CreateFile(argv[2],GENERIC_WRITE,0,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL))==INVALID_HANDLE_VALUE){<br />
		return 1;<br />
	}<br />
<br />
	//bstrURL-ben eloallitjuk az URL-t<br />
	if(MultiByteToWideChar(CP_ACP,0,argv[1],-1,wurl,MAX_PATH)==0 || (bstrURL=SysAllocString(wurl))==NULL){<br />
		CloseHandle(fo);<br />
		return 1;<br />
	}<br />
<br />
	if(!SUCCEEDED(OleInitialize(NULL))){<br />
		ret=1;<br />
		goto vege;<br />
	}<br />
		<br />
	//Letrhozzuk az IE objektumot<br />
	if(!SUCCEEDED(CoCreateInstance(CLSID_InternetExplorer,NULL,CLSCTX_LOCAL_SERVER,IID_IWebBrowser2,(void**)&pBrowser2)) || pBrowser2==NULL){<br />
		ret=1;<br />
		goto vege;<br />
	}<br />
<br />
	//hr=LoadTypeLib(L"shdocvw.dll",&pTypeLib);<br />
	//hr=GetTypeInfoOfGuid(DIID_DWebBrowserEvents2,&pTypeInfo);<br />
	psink=new Sink(pBrowser2,fo);<br />
	if(psink==NULL || !psink->SetupConnectionPoint()){<br />
		ret=1;<br />
		HRESULT hr;<br />
		hr=pBrowser2->Quit();<br />
		PUT(printf("Quit %d\r\n",hr);)<br />
		hr=pBrowser2->Release();<br />
		PUT(printf("Webbrowser Release %d\r\n",hr);)<br />
		goto vege;<br />
	}<br />
<br />
	if(!SUCCEEDED(pBrowser2->put_Visible(VARIANT_FALSE)) || !SUCCEEDED(pBrowser2->Navigate(bstrURL,&vEmpty,&vEmpty,&vEmpty,&vEmpty))){<br />
		ret=1;<br />
		HRESULT hr;<br />
		hr=pBrowser2->Quit();<br />
		PUT(printf("Quit %d\r\n",hr);)<br />
	}<br />
	<br />
	//A program leallas menete:<br />
	//1. Ha a dokumentum letoltodott, vagy timeout kovetkezik be, akkor leallitjuk a webbrosert pBrowser2->Quit() -tel<br />
	//2. A webbrowser quit uzenetet kuld, amit a sink lekezel, es <br />
	//   meghivja a Sink UnadviseConnectionPoint fuggvenyet, amely a connection point unadvise fuggvenyet hivja<br />
	//3. A connection point unadvise hatasara a webbrowser 4-szer meghivja a Sink::Release fuggvenyt<br />
	//   Meg kell varni a Sink::Release hivasok befejezodeset, csak ezutan lehet Release-elni a connection point-ot! (fontos! kulonben vagy a program, vagy az IE kiakadhat szinkronizacios problema miatt).<br />
	//   Ezert a Sink::Release-ben figyelni kell, mikor engedi el a webbrowser a Sink-et (amikor az m_cRef dekrementalas utan 1 lesz).<br />
	//4. Mikor a webbrowser elengedte a Sink-et, egy WM_CONNECTRELEASE (=WM_USER+100) uzenetet postolunk az uzenet ciklusnak.<br />
	//5. A WM_CONNECTRELEASE lekezelesekent meghivjuk a  Sink::ReleaseConnectionPoint fuggvenyt, amely meghivja a connection point Release fuggvenyet.<br />
	//6. Release-eljuk a Sink-et es a webbrowsert.<br />
	//Ha elobb a connection point-ot release-eljuk, es utana hivjuk meg a webbrowser Quit-jet,<br />
	//elofordulhat, hogy a Sink-et a webbrowser meg nem engedte el (az utolso Sink::Release meg az IE-ben nem futott le)<br />
	//es az IE, a pBrowser2->Quit() hatasara fellepo OnQuit esemenyt, a mar kozben release-elt <br />
	//connection point-on keresztul probalja elkuldeni a Sink-nek. Ebben az esetben az IE kiakadhat (szinkronizacios problema).<br />
<br />
	//Scenario of program stopping:<br />
	//1. If page downloaded, or timeout has occured, we stop the webbrowser by pBrowser2->Quit().<br />
	//2. The webbrowser sends quit message, which is handled by Sink, and calls the Sink::UnadviseConnectionPoint<br />
	//   member function, which calls the IConnectionPoint::Unadvise.<br />
	//3. IConnectionPoint::Unadvise causes the webbrowser to call back the Sink::Release 4 times.<br />
	//   We MUST wait for the last Sink::Release to complete, <br />
	//   only after this the IConnectionPoint::Release can be called. (it is important, otherwise<br />
	//   either our program or IE may cause application error becouse of synchronization problem).<br />
	//   For this reason we must trace in the Sink::Release, when the webbrowser releases the Sink.<br />
	//   (when the m_cRef becomes 1 after decrement).<br />
	//4. When the webbrowser released the Sink, we post a WM_CONNECTRELEASE (=WM_USER+100) windows<br />
	//   message to the message loop.<br />
	//5. By handling WM_CONNECTRELEASE windows message in message loop, we call the Sink::ReleaseConnectionPoint<br />
	//   member funtion, which calls IConnectionPoint::Release.<br />
	//6. We call IWebBrowser2::Release, Sink::Release, OleUninitialize.<br />
	UINT timer;<br />
	timer=0;<br />
	timer=SetTimer(NULL,0,TIMEOUT,NULL); //30 masodperces timeout varakozas a Sink::Invoke callbackre<br />
	MSG msg;<br />
	while(1){<br />
		GetMessage(&msg,0,0,0);<br />
		PUT(printf("WinMessage %d\r\n",msg.message);)<br />
		if(msg.message==WM_TIMER){<br />
			//timeout-tal kilepunk<br />
			if(DocumentDownloaded==0){<br />
				//utolso esely. Ha esetleg a callback nem lett meghivva, mert pl. nem erkezett meg a megfelelo esemeny<br />
				DownloadDocument(pBrowser2,fo);<br />
			}<br />
			HRESULT hr;<br />
			hr=pBrowser2->Quit();<br />
			PUT(printf("Quit %d\r\n");)<br />
		}<br />
		else if(msg.message==WM_CONNECTRELEASE){<br />
			//a Sink::Release-tol jott, jelezve, hogy az IConnectionPoint::Release <br />
			//biztonsagosan meghivhato, mert az IE befejezte a Sink hasznalatat.<br />
<br />
			//This message came from Sink::Release, signing the IE has finished using the Sink,<br />
			//so we can call IConnectionPoint::Release safely (I hope at least).<br />
			PUT(printf("ReleaseConnectionPoint\r\n");)<br />
			ULONG rel;<br />
			rel=psink->ReleaseConnectionPoint();<br />
			PUT(printf("Connection point Release %d\r\n",rel);)<br />
			rel=pBrowser2->Release();<br />
			PUT(printf("Webbrowser Release %d\r\n",rel);)<br />
			psink->Release();<br />
			break;<br />
		}<br />
		//TranslateMessage(&msg);<br />
		DispatchMessage(&msg);<br />
	}<br />
	if(timer!=0)KillTimer(NULL,timer);<br />
vege:<br />
	if(psink!=NULL)delete psink;<br />
	SysFreeString(bstrURL);<br />
	OleUninitialize();<br />
	PUT(printf("After OleUninitialize\r\n");)<br />
	CloseHandle(fo);<br />
	return ret;<br />
}</output></url></hr;++i){></oleauto.h></dispatch.h></exdispid.h></conio.h></comdef.h></winnls.h></stdio.h></mshtml.h></exdisp.h></windows.h>

Re: Handling Internet Explorer com server object in plain C++

jattila4010-Mar-08 3:48

jattila40

10-Mar-08 3:48

Inadvertently the vEmpty variable was not initialized before pBrowser2->Navigate(...). I did it, but this didn't solve the problem.

Link File Path

john56329-Mar-08 22:25

john5632

9-Mar-08 22:25

Hi Experts,

I am so curious to get the link file path but I could not. I am creating a shell context menu. As I click on link file(shortcut) Program resolve the name before the InvokeCommand() function. But in QueryContextMenu() I can detect the link file type through flag CMF_VERBSONLY but I could not get the link file path.

How can I do this?

COM Interop C++ unmanaged through C# .NET 2.0 Class Library to C# .NET 1.1managed Class Library

scottdj8-Mar-08 18:33

Re: COM Interop C++ unmanaged through C# .NET 2.0 Class Library to C# .NET 1.1managed Class Library

8-Mar-08 18:33

I have the following:

- A C# Class Libary written in .NET 1.1, lets call this Component A.
- A C# Class Library written .NET 2.0 that servers as a wrapper for A, called B. B is set up for COM Inetop, Strong Name, installed in GAC, REGASM run. BTW it works fine from an unmanaged C++ Console app.
- I added a class to an existing static library to call methods in B, which in turn calls corresponding methods in A.
The static lib, where the C++ class resides in linked into a C++ unmanaged DLL.
- CoInitializeEx(NULL, COINIT_MULTITHREADED); has already been called in another part of the app, a MFC C++ app that servers as a test client.

- When I try and do a
pIPTConfigManagerCOM_InteropPtr.CreateInstance(PTConfigManagerCOM_Interop::CLSID_CFPTConfigManagerCOM_Interop);

I get the following in the output window:

<mda:msg xmlns:mda="http://schemas.microsoft.com/CLR/2004/10/mda">

<mda:loaderLockMsg break="true"/>
</mda:msg>
ProductPayTestClient.exe has triggered a breakpoint

The breakpoint is it in vswprint.c

- I have turned off LoadLock exception being thrown in Debug->Exceptions->Managed Debuggin Assistants.

- I have declared a pointer to the Interface. Sometimes when I am stepping through, the pointer has an address of 0x00000000, but the m_pInterface seems to have a valid value. Sometimes when running MY test client, I see the Interface pointer is 0x00000000 and other times is seems to have a valid value. But in all cases my C++ unmanged test harness works, it, like the class I wrote in the static lib, imports the typelib, intellisense sees the members of the class.

Any ideas will be appreicated.

THX
Scott

scottdj8-Mar-08 18:36

Re: COM Interop C++ unmanaged through C# .NET 2.0 Class Library to C# .NET 1.1managed Class Library

8-Mar-08 18:36

More Info

The .NET 1.1 Class Library was written whith VS .NET 2003.
All other components were written with VS 2005.

Scott Dorman10-Mar-08 15:49

10-Mar-08 15:49

This looks very much like this question[^]. Please don't re-post questions. Everyone here answers on a volunteer basis and may not respond in a timeframe you feel is appropriate. Posting multiple times generally doesn't help you get a response.

Scott.

—In just two days, tomorrow will be yesterday.
—Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai