Re: Need help using object in ATL ActiveX EXE window services server. - COM Discussion Boards

Re: problems with ATL/DCOM

Renjith Ramachandran31-Dec-02 22:20

Renjith Ramachandran

31-Dec-02 22:20

try to unregister your ATL.dll and re register that...

~~~~Code the Dreams~~~~~

Re: problems with ATL/DCOM

Chen Jiadong13-Jun-07 20:47

Chen Jiadong

13-Jun-07 20:47

i've got the same problem.

I created a regular COM object with ATL, it worked fine by using the CoCreateInstance(), and then install the COM object to a COM+ application with Component Services administrative tool, when I try to call CoCreateInstance in my client code, I got "no such interface supported" error, the returned HRESULT is E_NOINTERFACE. But if I delete the object from COM+ application, and just register the component with regsvr32 command, my client works, again. Anything I have missed when I installed the component into the COM+ application?

DCOM Server File Access

Sasa Kajic24-Dec-02 14:00

Sasa Kajic

24-Dec-02 14:00

My DCOM server (developed in VC++ NET) can not access file system (eg. create files, etc...) but he runs on administrator account. Can anyone tell me why ?

Re: DCOM Server File Access

AlexO26-Dec-02 4:09

AlexO

26-Dec-02 4:09

If you mean system account (for example as a service), this is by default. You have to enable rights or work as another user to access file system

Popup/Alertboxes in WebBrowser Control

p_khasnis23-Dec-02 1:16

p_khasnis

23-Dec-02 1:16

Hello,

I want to know if there is any way to get an handle to PopUp box / Alert box.
These alert's are mostly displayed by Javascript functions on a webpage display.

I have a Webbrowser Control in my C++ application(mfc) and need to know when the Alert box is shown and also what was the user's action on it(He/she might click OK or Cancel button).

Thanking you in advance.

Prasad

Need help using object in ATL ActiveX EXE window services server.

bahruddina22-Dec-02 17:50

bahruddina

22-Dec-02 17:50

hi,

I'm developing ATL ActiveX EXE server that runs as a Window services using ATL wizard.
This server contains one ATL object (CTest).
How I can set the server so that when it started (via Window Services Applet), the server will :

1) initiate/create CTest.
2) Call method/function in this ATL object (CallMe).
3) destroy CTest when server stopped.

Thanx in advance.

Regards.

Re: Need help using object in ATL ActiveX EXE window services server.

pba_23-Dec-02 12:41

pba_

23-Dec-02 12:41

You will need to overwrite CServiceModule::Run - after the service will register the class objects, init your object and call the method. After the message loop sequence, destroy your object.

Re: Need help using object in ATL ActiveX EXE window services server.

bahruddina23-Dec-02 19:14

bahruddina

23-Dec-02 19:14

hi,

thanx for ur replay Smile | :)

I've change my code. But when I try to start my service I got an error :

Could not start the Test on Local Computer.
Error 1053: The service did not respond to the start or control request
in a timely fashion.

And one more thing; how i want to destroy the ATL object in a correct way:

m_Obj->Release()

or

m_Obj = NULL

Below is code for CServiceModule::Run() :

void CServiceModule::Run() { _Module.dwThreadID = GetCurrentThreadId(); HRESULT hr = CoInitialize(NULL); // If you are running on NT 4.0 or higher you can use the following call // instead to make the EXE free threaded. // This means that calls come in on a random RPC thread // HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED); _ASSERTE(SUCCEEDED(hr)); // This provides a NULL DACL which will allow access to everyone. CSecurityDescriptor sd; sd.InitializeFromThreadToken(); hr = CoInitializeSecurity(sd, -1, NULL, NULL, RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL); _ASSERTE(SUCCEEDED(hr)); hr = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER, REGCLS_MULTIPLEUSE); _ASSERTE(SUCCEEDED(hr)); <big>// //create an ATL object // CComObject<CMyObj> *m_Obj; CComObject<CMyObj>::CreateInstance(&m_Obj);</big> <big>// //call object method // m_Obj->CallMe();</big> LogEvent(_T("Service started")); if (m_bService) SetServiceStatus(SERVICE_RUNNING); MSG msg; while (GetMessage(&msg, 0, 0, 0)) DispatchMessage(&msg); <big>// //free the object; I'm not sure wether to use m_Obj->Release() or m_Obj = NULL // m_Obj->Release();</big> _Module.RevokeClassObjects(); CoUninitialize(); }

Below is code for CMyObj :

HRESULT CMyObj::FinalConstruct() { return S_OK; } void CMyObj::FinalRelease() { } <big>STDMETHODIMP CMyObj::CallMe() { MessageBox(NULL, "Window services called me.", "MyObj", MB_OK); return S_OK; }</big>

Sorry for the silly questions. Smile | :)

Thanx in advance.

Regards.

Re: Need help using object in ATL ActiveX EXE window services server.

pba_24-Dec-02 4:28

pba_

24-Dec-02 4:28

NT Services are running into a window station which is not interactive, so they cannot have a user interface - your service will be blocked at MessageBox call from CallMe method. Try to write something to the debug output instead. To release the object call Release ( setting the smart ptr to NULL will NOT dereference the object), or use CComObjectStack instead of CComObject, since your object is used only in Run method.
ps. If you really want, you can change your service to interact with the active desktop ( to have a user interface ), by using service_interactive flag when you call CreateService.

Re: Need help using object in ATL ActiveX EXE window services server.

geo_m30-Dec-02 5:56

geo_m

30-Dec-02 5:56

Or if you really want to use the messagebox inside the service, really only for debugging purposes or something like that, you can use the MB_SERVICE_NOTIFICATION flag for the messagebox function

<br />
MessageBox( NULL, "some message", NULL, MB_OK | MB_SERVICE_NOTIFICATION );<br />

This will pop-up the message box on the default desktop.

Assigining a NULL value to the smart pointer is also a correct way of releasing the pointer - if you look into the implementation of CComPtr, it will first call release on currently assigned pointer and then attaches to the new one. This is a must for correctly working = operator, so I guess it is valid for each com smart pointer. Then if you assign NULL, it will first call the Release and then stores your NULL value.

Re: Need help using object in ATL ActiveX EXE window services server.

pba_30-Dec-02 6:03

pba_

30-Dec-02 6:03

You are right - assigning NULL to a CComPtr instance will dereference the contained interface. Thanks!

Re: Need help using object in ATL ActiveX EXE window services server.

bahruddina30-Dec-02 20:28

bahruddina

30-Dec-02 20:28

hi,

When I call m_Obj->Release() or m_Obj = NULL; my FinalRelease() never called Frown | :(

void CServiceModule::Run()<br />
{<br />
    _Module.dwThreadID = GetCurrentThreadId();<br />
<br />
    HRESULT hr = CoInitialize(NULL);<br />
//  If you are running on NT 4.0 or higher you can use the following call<br />
//  instead to make the EXE free threaded.<br />
//  This means that calls come in on a random RPC thread<br />
//  HRESULT hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);<br />
<br />
    _ASSERTE(SUCCEEDED(hr));<br />
<br />
    // This provides a NULL DACL which will allow access to everyone.<br />
    CSecurityDescriptor sd;<br />
    sd.InitializeFromThreadToken();<br />
    hr = CoInitializeSecurity(sd, -1, NULL, NULL,<br />
        RPC_C_AUTHN_LEVEL_PKT, RPC_C_IMP_LEVEL_IMPERSONATE, NULL, EOAC_NONE, NULL);<br />
    _ASSERTE(SUCCEEDED(hr));<br />
<br />
    hr = _Module.RegisterClassObjects(CLSCTX_LOCAL_SERVER | CLSCTX_REMOTE_SERVER, REGCLS_MULTIPLEUSE);<br />
    _ASSERTE(SUCCEEDED(hr));<br />
<br />
	CComObject<CMyObj> *m_Obj;<br />
	CComObject<CMyObj>::CreateInstance(&m_Obj);<br />
<br />
	m_Obj->CallMe();<br />
<br />
    LogEvent(_T("Service started"));<br />
    if (m_bService)<br />
        SetServiceStatus(SERVICE_RUNNING);<br />
<br />
    MSG msg;<br />
    while (GetMessage(&msg, 0, 0, 0))<br />
        DispatchMessage(&msg);<br />
<br />
        <big>//FinalRelease is not triggered<br />
	m_Obj->Release();</big> <br />
<br />
    _Module.RevokeClassObjects();<br />
<br />
    CoUninitialize();<br />
}<br />

Below is .h code for CMyObj :

<br />
// MyObj.h : Declaration of the CMyObj<br />
<br />
#ifndef __MYOBJ_H_<br />
#define __MYOBJ_H_<br />
<br />
#include "resource.h"       // main symbols<br />
<br />
/////////////////////////////////////////////////////////////////////////////<br />
// CMyObj<br />
class ATL_NO_VTABLE CMyObj : <br />
	public CComObjectRootEx<<CComSingleThreadModel>>,<br />
	public CComCoClass<<CMyObj, &CLSID_MyObj>>,<br />
	public IDispatchImpl<<IMyObj, &IID_IMyObj, &LIBID_TESTLib>><br />
{<br />
public:<br />
	CMyObj()<br />
	{<br />
	}<br />
<br />
	HRESULT FinalConstruct()<br />
	{<br />
		MessageBox(NULL, "Start", NULL, MB_OK | MB_SERVICE_NOTIFICATION );<br />
		return S_OK;<br />
	}<br />
<br />
	<big><br />
        //this never get called when Release() or NULL executed<br />
        void FinalRelease()<br />
	{<br />
		MessageBox(NULL, "stop", NULL, MB_OK | MB_SERVICE_NOTIFICATION);<br />
	}</big><br />
<br />
DECLARE_REGISTRY_RESOURCEID(IDR_MYOBJ)<br />
<br />
DECLARE_PROTECT_FINAL_CONSTRUCT()<br />
<br />
BEGIN_COM_MAP(CMyObj)<br />
	COM_INTERFACE_ENTRY(IMyObj)<br />
	COM_INTERFACE_ENTRY(IDispatch)<br />
END_COM_MAP()<br />
<br />
// IMyObj<br />
public:<br />
	STDMETHOD(CallMe)();<br />
};<br />
<br />
#endif //__MYOBJ_H_<br />

Thanx in advance Smile | :)

Regards.

packaging a vc++ software?

xxhimanshu21-Dec-02 1:40

xxhimanshu

21-Dec-02 1:40

hi all,

i am stuck.please help. my problem is I want to make a setup program for my vc++ application as we have in VB.can anyone help me out?

thanks in advance
regards

Himanshu

Re: packaging a vc++ software?

Renjith Ramachandran29-Dec-02 6:00

Renjith Ramachandran

29-Dec-02 6:00

hey
use the SMS installer 16/32

~~~~Code the Dreams~~~~~

ATL COM thingie using inheritance

Scracha20-Dec-02 4:56

Scracha

20-Dec-02 4:56

Is it possible for a COM Class I've made using the ATL Wizard thingie to inherit from another class.

The following code doesn't compile since I added "public INewParentClass", I get the following error on the COM_INTERFACE_ENTRY(IDispatch) line.

c:\temp\code\mymethod2\mymethod.h(29) : error C2594: 'static_cast' : ambiguous conversions from 'class CMYMETHOD *' to 'struct IDispatch *'

Code is as follows.

/////////////////////////////////////////////////////////////////////////////
// MYMETHOD.h : Declaration of the CMYMETHOD

#ifndef __MYMETHOD_H_
#define __MYMETHOD_H_
#include "resource.h" // main symbols
#include "IParentClass.h"

/////////////////////////////////////////////////////////////////////////////
// CMYMETHOD
class ATL_NO_VTABLE CMYMETHOD :
public CComObjectRootEx<ccomsinglethreadmodel>,
public CComCoClass<cmymethod, &clsid_mymethod="">,
public IDispatchImpl<ivpim, &iid_imymethod,="" &libid_mymethodserver2lib="">,
public INewParentClass
{
public:
CMYMETHOD()
{
}

DECLARE_REGISTRY_RESOURCEID(IDR_MYMETHOD)

DECLARE_PROTECT_FINAL_CONSTRUCT()

BEGIN_COM_MAP(CMYMETHOD)
COM_INTERFACE_ENTRY(IMYMETHOD)
COM_INTERFACE_ENTRY(IDispatch)
END_COM_MAP()

// IMYMETHOD
public:
STDMETHOD(Hello)(/*[in]*/ BSTR sClientName);
};

#endif //__MYMETHOD_H_

Re: ATL COM thingie using inheritance

Ranjan Banerji20-Dec-02 5:44

Ranjan Banerji

20-Dec-02 5:44

Yes it is possible. Not sure what the cause of the error is, but most likely it is coming from something in INewParentClass. An ATL based class can inherit from a regular C++ class, not another ATL class.

Re: ATL COM thingie using inheritance

pba_23-Dec-02 12:30

pba_

23-Dec-02 12:30

Probably INewParentClass is inherited from IDispatchImpl too.

Beginners help with SAFEARRAY

Obliterator19-Dec-02 8:24

Obliterator

19-Dec-02 8:24

Hi all,

I have what seems to be a trivial problem...
I need to convert an array of doubles to a SAFEARRAY**

i.e. I have:
double MyArray[50];

I need to pass this to a third part function as a SAFEARRAY**

I'm sure this is a doddle - but I just keep crashing it with what I pass.
I'm new to all this COM stuff... why does it have to be so complicated?!

Thanks

--

The Obliterator

Re: Beginners help with SAFEARRAY

Barry Lapthorn19-Dec-02 20:47

Barry Lapthorn

19-Dec-02 20:47

Something like this should help:

SAFEARRAY* CFoo::DoubleArrayToSafeArray(double* array, int n)<br />
{<br />
        // n is the size of the array.<br />
        // caller takes ownership of returned SAFEARRAY<br />
<br />
        // create array bounds.<br />
	SAFEARRAYBOUND rgsabound[1];<br />
	rgsabound[0].lLbound = 0;<br />
	rgsabound[0].cElements = n;<br />
<br />
        //  create safearray<br />
	SAFEARRAY* pReturn = NULL;<br />
	pReturn = SafeArrayCreate( VT_R8 , 1, rgsabound);<br />
<br />
	if (pReturn == NULL)<br />
		return pReturn;<br />
<br />
        //  populate it<br />
	long idxPos = 0;<br />
	for (idxPos = 0 ; idxPos < n; idxPos++)<br />
	{<br />
	  HRESULT hr = SafeArrayPutElement(pReturn, &idxPos, (void*) &(array[idxPos]));<br />
	}<br />
	return pReturn;<br />
}

Regards

Barry

Re: Beginners help with SAFEARRAY

work_to_live20-Dec-02 20:18

work_to_live

20-Dec-02 20:18

Barry,
Can you point me to a good overview on the use of SafeArrays and Variants?

Thanks.

Re: Beginners help with SAFEARRAY

Barry Lapthorn22-Dec-02 0:37

Barry Lapthorn

22-Dec-02 0:37

I spent ages trawling through MSDN I'm afraid. Frown | :(

I would imagine that there are some articles on safearrays and variants here on CodeProject as well. Big Grin | :-D

Regards

Barry

Re: Beginners help with SAFEARRAY

Barry Lapthorn23-Dec-02 3:16

Barry Lapthorn

23-Dec-02 3:16

Try:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnguion/html/drgui032999.asp[^]

and

http://support.microsoft.com/support/kb/articles/Q167/6/68.ASP[^]

Regards

Barry

a COM+ design question

Anonymous19-Dec-02 3:16

Anonymous

19-Dec-02 3:16

I want to design a card game ,use Com+ server.
But when 4 clients connected,it's created 4 com+ instance in server,
so it's hard to manage.
I want to know :
how I can connect every 4 clients to 1 com+ instance in server.

Re: a COM+ design question

Burt Harris21-Dec-02 10:34

Burt Harris

21-Dec-02 10:34

Hi Anonymous,

I'm not sure use of COM+ for this is a good match betwen your problem and the platform. You might want to take a look at DirectPlay http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dx8_c/directx_cpp/Play/DPlay.asp[^] which is specifically designed for multi-player games.

Burt Harris

Got CLSID/PROGID, how to access?

Anonymous19-Dec-02 1:25

Anonymous

19-Dec-02 1:25

Hi,

I've got a CLSID for a COM object in a C++ program, how do I access methods on this object. Do I have to call QueryInterface() somehow?

I can do a CoCreateInstance() but that requires an interface ID. Assuming all I have is the CLSID, how do I do it?

Thanks!

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