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You'll also want to create a new ProgID for the second component, or CreateObject()/new ActiveXObject() won't work.
Kev
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I have a software which puts all the data in a dll....I want to access this data from MATLAB and I want it to be event driven. For this(event driven operations in MATLAB) I have to create a COM. I have no experience in creating COM. I googled but couldn;t find any good material on COM basics and hwo to create one. :(could anyone tell me how to proceed?
thanks
-- modified at 16:27 Tuesday 20th December, 2005
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Hi Vidyarani,
I am currently working on a similar problem it seems. See the message “out-of-process DLL”. If you are trying to transfer data to MATLAB and if you are trying to let your DLL tell MATLAB what to do with the data, then you can/should use the MATLAB engine. I suppose you are writing the DLL not the application, right? There are MATLAB engine library files, which you can link with your DLL project. The MATLAB engine library basically sets up a COM connection with MATLAB with the advantage that you do not have to worry about COM.
The MATLAB engine library lets you transfer data to and from MATLAB. Your DLL should transfer data by creating MATLAB data-types (matrixes) using mx-functions, also included in the MATLAB engine library files. To create event driven operation you can first transfer data to MATLAB, and then you can execute .m-functions by letting the MATLAB engine, within your DLL, tell MATLAB which .m-function to execute. In this way, the .m-functions act as a kind of callback-functions.
I hope this is the kind of event driven operation you are after. If you also want MATLAB to call back to your DLL in an event driven manner, then you should be looking at COM as well. But to do this from within a DLL is not straightforward.
Things to look at in MATLAB help:
MATLAB \ External Interfaces/API \ Calling MATLAB from C and Fortran Programs
MATLAB \ External Interfaces/API Reference \ C Engine Functions
MATLAB \ External Interfaces/API Reference \ C MX-Functions
Things to look at in MATLAB root:
..\ MATLAB \ extern “MATLAB engine library files”
I hope this will get you going. If it doesn’t and you really want to create COM functions in your DLL and you want MATLAB to call these functions, then you are facing the same problem I have. In that case we can discuss further.
Kind regards,
Marcel Dijkstra
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Hi Marcel,
Thanks for the reply. Let me explain as to what exactly.
---------------------------------
| Have Software which sends data |
---------------------------------
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---------------------------------- --------------------------
| DLL where the data is stored | -------------|other apps accessing data|
---------------------------------- ---------------------------
whenever the DLL gets fresh data it can send a notification(or event) . I need to access this data from the DLL i.e want MATLAB to call these functions
I really dont want to make any changes to the DLL as there are a lot of other applications which use the DLL. So I will have to build a COM isn't it?
Regards,
Vidya
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Hi Vidya,
I actually misunderstood your problem. So you are not programming the DLL, but you are thinking about making something in COM for MATLAB. Am I right in assuming that the DLL has already got a COM interface with which other programs can access its data? I assume this is the case because otherwise there would be no use in writing anything in COM if you do not want to change the DLL. How is this event/notification done? Also through COM?
Lets assume the DLL exports COM(ActiveX) automation objects then MATLAB can directly connect to these COM server objects in your DLL. Open you registry “Start-Run-regedit” then goto ”My Computer \ HKEY_CLASSES_ROOT \ CLSID”. Select CLSID and search for your DLL or application name. As an example search for “Microsoft Office Excel Application”. If I do this, regedit finds the key “My Computer \ HKEY_CLASSES_ROOT \ CLSID \ {00024500-0000-0000-C000-000000000046}”. Now you can find the subkey “ProgID” with value “Excel.Application.11” or something similar.
Now you can connect to this COM server object by using its ProgID in MATLAB.
Type in the command window:
e = actxserver('Excel.Application.11');<br />
methodsview(e);<br />
e.Help();
If actxserver() succeeds you can use methodsview() to see the functions you can access. As an example we can ask the Excel COM object to display help information by calling e.Help();
I hope this is what you are looking for.
Regards,
Marcel
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Hi Marcel,
The DLL has not got a COM interface. I need a COM which can speak to the DLL and MATLAB. So the COM gets the information from the DLL and sends it to MATLAB. I have an example but not able to figure out how to do it myself? So wanted to know if there are more examples?
Thanks
Vidya
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Hi Vidya,
Correct me if m wrong !!!
Whenever the dll gets fresh data its sends some notification/events, its done?
Okay so you need to access this data, right ?
One possible way to do so is capture the notificaion/events sent by the dll.
Another way of doing such thing is use the interfaces exposed by your dll, I
mean your dll sends a notification/events, so there must exists some exposed
interfaces...
To check that your dll has exposed interfaces or not, you can design the
sample using ATL...
Steps to genertate the sample
1. Select ATL component project
2. Add simple object to project
3. Go to class view tab
3. Right click on class and select implements interface, it will pop up
a dialog
4. Click on "AddTypeLib", select your dll's typelib and click "ok"
5. It will show you the list of interfaces exposed by your dll
5. Select the appropriate interface and click ok
6. IDE will generate the source code for interface implementation
Ah, I think you should try this... this might ease the difficulty you are
facing....
Let me know if I can do ne thing?
Cheers,
Vishal
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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
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Hi everybody,
I need to implement Doc/View/Frame in an ActiveX control. I have tried to copy the code from a standart MFC Wizard generated SDI application in a standart Wizard generated ActiveX control, but it didnt work - all I could get was a bunch of crashes (for the document, I derived my class from COleDocument). Can anybody point me in the right direction. Any information is appreciated.
Thanks in advance,
Dennis.
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I just wanted to day that I stopped finding a way to send this copydatastruct to load a new file.
I find it rather difficult to debug because I can't really see what going on in the bsplayer. And I found out that when I start BSPlayer with parameter file or playlist it also work, and that is sufficient for the moment.
Winspector is a nice tool to see the windows messages flying around, and I could see the pointer arriving in the bsplayer process, but it's unclear why it still does not work. I have tried converting the datapath string to a char[] array and ended it with \0 but nothing worked.
Next project will be a little C# movie player with DirectShow.
greetings, Bart
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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
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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.
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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
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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.
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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
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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
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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
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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
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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
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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.
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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
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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.
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