Monitor disk writes by particular running processes - COM Discussion Boards

MarcelDijk19-Dec-05 13:43

19-Dec-05 13:43

Dear COM programmers,

I hope somebody can give me some thoughts about a problem I have. I am a complete newbie at COM programming and desperately trying to write a DLL library for a simulation program I am using. The simulation program allows me to write a DLL library with user defined functions. Now my plan is to write a general DLL library, which calls MATLAB to do the actual work.

I am already using the MATLAB engine to let my DLL(simulation program) call user defined functions in MATLAB. But, I also need MATLAB to call functions in my DLL, from within the user defined functions written in MATLAB. For this I wanted to setup an out-of-process server within my DLL library.

I succeeded at writing an out-of-process server in a normal EXE application and I could let MATLAB call functions and transfer data to my EXE application. But my real question is how to write an out-of-process server in a DLL? Is it at all possible, because usually DLL’s are in-process-servers?

Kind regards,
Marcel Dijkstra

Re: Out-of-Process DLL

Gizzo19-Dec-05 22:04

Gizzo

19-Dec-05 22:04

Hi
I think there was the option to write a COM-DLL and instead of load it into the client, you have the option to configure it just to be loaded as a surrogate, in a system proccess.
Have a look in the COM section, in COM Architecture. One of these articles explain how to configure the registry (i'm not sure about this, just trying to remember).

Regards.

Re: Out-of-Process DLL

MarcelDijk20-Dec-05 1:53

MarcelDijk

20-Dec-05 1:53

Hi Gizzo,

DLL surrogate is the thing I was looking for.
I looked at the COM Architecture section and
found articles on MSDN.
I think this will keep me busy for some time.

Thanks,
Marcel

COM. C++. Interface IDispatch::Invoke

shaman-marakame19-Dec-05 10:19

shaman-marakame

19-Dec-05 10:19

Hello People

I have an issues with Interface IDispatch->Invoke

hr = pDisp->Invoke(dispid, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, &dispparamsArgs, NULL, &excepinfo, NULL);

Thats how I define params which I passing into Invoke
//DISPPARAMS dispparamsArgs = {(VARIANTARG*)&pbstrXMLDoc, NULL, 1, 0};
or like this
DISPPARAMS dispparamsArgs = {NULL, NULL, 0, 0};

This is the actual method which I trying to load:
IRMGetLicense::GetSystemInfo

HRESULT GetSystemInfo(
BSTR* pbstrXMLDoc
);

Parameter pbstrXMLDoc [out] Pointer to a string identifying the system information.

Return Values
This method returns an HRESULT.

Return code Description
S_OK The method succeeded.

But everything happens not as I expecting. Do you have any Ideas why I getting this errors ? Or maybe I do something wrong ?

hr = 0x80020009 Exception occurred.
excepinfo = bstrDescription: 0x00176d24 "The parameter is incorrect.

Thank you.

--
Shaman Marakame.

Re: COM. C++. Interface IDispatch::Invoke

Welf Wiest31-Jan-06 1:37

Welf Wiest

31-Jan-06 1:37

Hello Shaman,

Just try the following parameters:

VARIANT vntArg;

ComBSTR bstrXMLDoc; //or BSTR bstrXMLDoc if you don't use ATL

V_BSTRREF(&vntArg) = &bstrXMLDoc;
V_VT(&vntArg) = VT_BSTR | VT_BYREF;

DISPPARAMS dispparamsArgs = {&vntArg, NULL, 1, 0};

//hr = pDisp->Invoke(dispid, IID_NULL, LOCALE_SYSTEM_DEFAULT, DISPATCH_METHOD, &dispparamsArgs, NULL, &excepinfo, NULL);

Welf Wiest

Disable Word Macro

kim3er18-Dec-05 23:57

kim3er

18-Dec-05 23:57

Hi,

I'm opening a Word Document (that contains a Macro, which fires on startup) from a .NET app. I would like to stop any macro's from running, when the document is opened.

Any suggestions would be most helpful,

Rich

Re: Disable Word Macro

Rajesh R Subramanian20-Dec-05 19:24

Rajesh R Subramanian

20-Dec-05 19:24

Open MS Word and Go to Tools - Macros and disable the macros you want to stop from running, and then restart MS Word.

Regards,
Rajesh R. Subramanian

SOME SOULS NEVER REST

Monitor disk writes by particular running processes

Anthony Brenelière16-Dec-05 6:38

Anthony Brenelière

16-Dec-05 6:38

Hello,

I try to get the disk writes (on a system partition or on a remote share) by particular running processes.

I try to make an API monitor for thoses processes but it seems complicated because I also need to get the written filepath names.

I don't how that can be possible to do..

Any hint would be greatly appreciated

Re: Monitor disk writes by particular running processes

TheGreatAndPowerfulOz16-Dec-05 7:01

TheGreatAndPowerfulOz

16-Dec-05 7:01

SysInternals Filemon for Windows[^]

Re: Monitor disk writes by particular running processes

Anthony Brenelière17-Dec-05 2:19

Anthony Brenelière

17-Dec-05 2:19

Yes I need some kind of product like filemon,

Filemon can only works with administrative privileges. Furthermore I need to have it automated, to generate logs.

How does that program work ???

Anthony Brenelière

Problem with IpublishingWizard

devcdd16-Dec-05 2:54

devcdd

16-Dec-05 2:54

I faced a problem when calling the method Initialize of IpublishingWizard interface.

hr = ::CoCreateInstance(
CLSID_PublishingWizard,
NULL,
CLSCTX_INPROC_SERVER,
IID_IUnknown,
(LPVOID FAR *) &punk);

hr = punk->QueryInterface(
__uuidof(IPublishingWizard),
(void**) &pPubWiz);

if ( FAILED(hr) )
return;

wchar_t pszServiceProvider[128];
_mbstowcsz(pszServiceProvider, "InternetPhotoPrinting", sizeof(pszServiceProvider));

hr = pPubWiz->Initialize(pdo, SHPWHF_NOFILESELECTOR, (LPCWSTR)pszServiceProvider);

if ( FAILED(hr) )
return;

1. Wizard does not appear.
2. Initialize method always returns S_OK independently of parameters value.

Re: Problem with IpublishingWizard

DeniseMak29-Dec-05 12:25

DeniseMak

29-Dec-05 12:25

Hi - I'm working on a similar problem with a crash after the wizard, but I did get the wizard to display. You need to use the AddPages method of IPublishingWizard (inherited from IWizardExtenstion) to fill an array of HPROPSHEETPAGE's, create a PropertySheetHeader with these pages, and call PropertySheet() to display. Let me know if this works for you.

hr = pIPublish->Initialize(pDataObject,SHPWHF_NOFILESELECTOR, L"InternetPhotoPrinting");
if SUCCEEDED(hr)
{
DWORD dwNumPagesAdded = 0;
HPROPSHEETPAGE hPropSheets[9]
hr = pIPublish->AddPages(&hPropSheets[0], 9, &dwNumPagesAdded);
if SUCCEEDED(hr)
{
psh.phpage = hPropSheets;
psh.nPages = dwNumPagesAdded;
psh.nStartPage = 0;
psh.dwFlags = PSH_WIZARD;
psh.hwndParent = NULL;
psh.hInstance = NULL;
PropertySheet(&psh);
}
}

Thanks,
-Denise

Re: Problem with IpublishingWizard

devcdd2-Jan-06 22:57

devcdd

2-Jan-06 22:57

Hello, Denise!

Thank you for help. I tried your advice, but the window with Wizard did not appear, though PropertySheet returned normal result (-1). Do you have any ideas?

Thanks, Sergey.

Implementing Lua Debugger using COM

Prince0fPersia15-Dec-05 20:44

Prince0fPersia

15-Dec-05 20:44

i am new to COM programming so i was wondering if any proffesional COM programmers can help me here... i work for a game company and i need to implement a remote debugger for our Script Engine which is a LUA script engine. some one suggested me to use COM servers and clients for this. I dont have much knowledge of COM right now and im studying it right now. With the amount of knowledge i have i can imagine for this project i need to have a COM server which can provide two types of object model.. one debugger and one debugee... and then clients have to use these interfaces to send and recieve info... like for example for a BREAK command the script editor uses the debugger interface to send data to the debugee saying that i need to break at this line when ever ya reach and blah blah.. in exchange the application would use debuggee interface to call debugger to say that we have reached this line and stuff... does this architecture seem aright? i mean using COM...?? and then one more important thing is that there could be any number of interfaces alive out there.... is there anyway in COM to find how many debugee interfaces are running and then access them???!!! any suggestion and help is much appreciated.... thanks

Re: Implementing Lua Debugger using COM

Brian C Hart30-Dec-05 23:28

Brian C Hart

30-Dec-05 23:28

Perhaps more information on the nuts and bolts of how one actually *writes* this software may be helpful.. I have a step-by-step DCOM tutorial, where I build a simple server which says "Hello, world!" back to the client, may help put some of this in practical perspective...

The tutorials are written as a series of separate articles, called Steps, which cover the major breakpoints in the development of the system.

Step 1 of the tutorial for VC 6 is at
http://www.codeproject.com/com/HelloTutorial1.asp[^]

And Step 1 of the turtorial for Visual C++.NET 2003 is at
http://www.codeproject.com/useritems/HelloTutorial1NET.asp[^]

I tried to write the tutorials in Microsoft-ese, so you can follow along as if you were reading the Scribble tutorial. The VS.NET version is still a work in progress; that's why it's still in "Unedited User Constributions."
Not all the Steps have been written for the VS.NET version yet. But I am working on it!

Stay tuned!

Sincerely Yours,
Brian Hart
Department of Physics and Astronomy
University of California, Irvine

word add-in

dogogbird14-Dec-05 21:49

dogogbird

14-Dec-05 21:49

I want to masking the word's SaveAs function,and the EditCopt EditPaste function.First,I build a ATL project, then input the needed library.I want to reload the SaveAs funcion,and EditCpopt EditPaste function,but I Don't know
how to write the above 3 function.
If anyone know how to do this,please tell me!
Thank you very much! Laugh | :laugh:

Extensible Storage Engine

M Tauheed13-Dec-05 21:20

M Tauheed

13-Dec-05 21:20

I want to Modify Microsoft Exchange database. Is there any component available for that purpose?

Tauheed

How to restrict client application to create COM object

lvantin13-Dec-05 15:26

lvantin

13-Dec-05 15:26

Hi all,
I wrote a server(VC++) having 2 COM object(A,B) & I want client application only can create COM object A and can not create COM object B. COM object B will be return by calling a function exported in an interface of COM object A.

For example, client application written by VB
Dim a = new A
Dim b as B
call a.getInstanceB(b)
call b.doSomething

Any body know what to do to make COM object B can not be created by client application?
Thanks a lot,
Tin Le,

Re: How to restrict client application to create COM object

Per Nilsson13-Dec-05 21:44

Per Nilsson

13-Dec-05 21:44

As I've been curious about the same thing, I took this as an exercise, and
if you use ATL for your COM server, I have the solution for you.

ATL includes an object map in its implementation file that includes entries for each class the server implements. The map is located in the COM servers implementation file (named <project name="">.cpp) and looks like this

BEGIN_OBJECT_MAP(ObjectMap)
  OBJECT_ENTRY(CLSID_Creatable, CCreatable)
  OBJECT_ENTRY(CLSID_IsNotCreatable, CIsNotCreatable)
END_OBJECT_MAP()

Change the object entry to OBJECT_ENTRY_NON_CREATEABLE of your non, creatable class.

BEGIN_OBJECT_MAP(ObjectMap)
  OBJECT_ENTRY(CLSID_Creatable, CCreatable)
  OBJECT_ENTRY_NON_CREATEABLE(CIsNotCreatable)
END_OBJECT_MAP()

After this, the CIsNotCreatable coclass cannot be created by CoCreateInstance. (Take a look at the documentation of OBJECT_ENTRY_NON_CREATEABLE in MSDN).

To let the creatable class create an instance of the non creatable and return a COM pointer ot it, you can do like this

STDMETHODIMP CCreatable::CreateNotCreatableObject(IIsNotCreatable **obj)
{
  AFX_MANAGE_STATE(AfxGetStaticModuleState())

  HRESULT hr;

  //
  // CComObject template class is the root of all ATL COM objects
  // The CComObject implements the IUnknown defined methods.
  //
  // We set up a pointer to a COM object of class CIsNotCreatable
  //(that inherits from IIsNotCreatable)
  //
  CComObject<CIsNotCreatable>* instanceOfNotCreatableClass;

  //
  // Then we can use the CreateInstance static method olf CComObject to
  // create an instance of the object. (Otherwise we could have used new)
  //
  hr = CComObject<CIsNotCreatable>::CreateInstance(&instanceOfNotCreatableClass);


  if (SUCCEEDED (hr)) {
    // 
    // As we will return an COM pointer from our method, we must remember
    // to call AddRef on it.
    //
    instanceOfNotCreatableClass->AddRef ();

    //
    // Assign the return value
    //
    *obj = instanceOfNotCreatableClass;
  }

  return hr;
}

Re: How to restrict client application to create COM object

User 21559714-Dec-05 9:05

User 215597

14-Dec-05 9:05

- Check for noncreatable[^] MIDL attribute
- Making an ATL Object Noncreatable[^]

Have a great day ahead!
Regards,
Sohail Kadiwala
(My Blog - http://blogs.wdevs.com/sohail/[^])

modified 21-Apr-21 21:01pm.

COM Wrapper for C++ DLL

James Smith13-Dec-05 5:37

James Smith

13-Dec-05 5:37

Hi all,

I have a C++ DLL that I "think" I need to make COM aware to make it work on both 32 and 64 bit windows processors. According to Microsoft site:

"On 64-bit Windows, a 64-bit process cannot load a 32-bit dynamic-link library (DLL). Additionally, a 32-bit process cannot load a 64-bit DLL. However, 64-bit Windows supports remote procedure calls (RPC) between 64-bit and 32-bit processes (both on the same computer and across computers). On 64-bit Windows, an out-of-process 32-bit COM server can communicate with a 64-bit client, and an out-of-process 64-bit COM server can communicate with a 32-bit client. Therefore, if you have a 32-bit DLL that is not COM-aware, you can wrap it in an out-of-process COM server and use COM to marshal calls to and from a 64-bit process." (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/win64/win64/process_interoperability.asp)"

Unfortunately, I don't have a whole lot of COM experience. Can anyone point me at some resource to help me out with this project? Anyone with good/bad experience doing this type of wrapper? Any suggestion, or help would be greatly appreciated.

Thank you in advance,
James

Re: COM Wrapper for C++ DLL

lemur211-Jan-06 10:02

lemur2

11-Jan-06 10:02

Go to the COM and/or ATL section of code project. There are plenty of tutorials there.

I've not done a wrapper for this explicit reason, but I've wrapped other DLLs before and its no big problem.

The simplest way is to use the ATL Appwizard assuming you're using VC++.

Kev

How to create COM objects in different processes

Per Nilsson12-Dec-05 22:28

Per Nilsson

12-Dec-05 22:28

When I create multiple out-of-process COM instances of same class from a com server, is it then, in some way, possible to let them run in different processes?

-- modified at 4:29 Tuesday 13th December, 2005

CoCreateInstace Working Differently then createobject

ky_rerun12-Dec-05 6:06

ky_rerun

12-Dec-05 6:06

I have writen a COM Exe.

I an create the object and call it all day from VB. If I create the object in a C++ application using #import symanctics. Calling application hangs and eventually gets a runtime error that crashes msdev environment. What is proper way to create a com exe object through C++ that will mimic the behavior of createobject in vb.

a programmer traped in a thugs body

ATL COM Server throws Exception.

Diana Fernandez12-Dec-05 0:36

Diana Fernandez

12-Dec-05 0:36

Hi I have searched a lot for this, but in vain. I found sites were the same problem has been raised, but nowhere with a proper answer. I hope I will get an answer here.

I am using an ATL COM server in VC++ from C#. Object of a class from the COM side is successfully created at C# side. But while calling a method on that object it is throwing an error with message "The Server threw an exception". The Error encountered is 0X80010105. And the HRESULT is -2147417851.

Everything was working fine until I made some changes at the client side. I don't think those changes have some relation in with this error.

Code for the Server and client side are as shown below

//Client side in C#
ServerObj sObj = new ServerObj();

//Error is thrown here, arguments passed are interger, reference of structure and object of calling class.
sObj.CallServerMethod(integer, ref structure, this);

//Server side in VC++
STDMETHODIMP CServerObj ::CallServerMethod(int integer, tagStruct *pVal, VARIANT vt)
{

}

Thanks in Advance,
Diana.

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